Alzheimer disease and platelets: how’s that relevant
© Catricala' et al.; licensee BioMed Central Ltd. 2012
Received: 24 May 2012
Accepted: 1 August 2012
Published: 17 September 2012
Alzheimer Disease (AD) is the most common neurodegenerative disorder worldwide, and account for 60% to 70% of all cases of progressive cognitive impairment in elderly patients. At the microscopic level distinctive features of AD are neurons and synapses degeneration, together with extensive amounts of senile plaques and neurofibrillars tangles. The degenerative process probably starts 20–30 years before the clinical onset of the disease. Senile plaques are composed of a central core of amyloid β peptide, Aβ, derived from the metabolism of the larger amyloid precursor protein, APP, which is expressed not only in the brain, but even in non neuronal tissues. More than 30 years ago, some studies reported that human platelets express APP and all the enzymatic activities necessary to process this protein through the same pathways described in the brain. Since then a large number of evidence has been accumulated to suggest that platelets may be a good peripheral model to study the metabolism of APP, and the pathophysiology of the onset of AD. In this review, we will summarize the current knowledge on the involvement of platelets in Alzheimer Disease. Although platelets are generally accepted as a suitable model for AD, the current scientific interest on this model is very high, because many concepts still remain debated and controversial. At the same time, however, these still unsolved divergences mirror a difficulty to establish constant parameters to better defined the role of platelets in AD.
KeywordsAlzheimer disease Platelets Amyloid precursor protein.
Molecular features and pathogenesis of alzheimer disease
Alzhemeir’s Disease (AD) is a chronic progressive neurodegenerative disorder characterized by a devastating cognitive and memory decline. It is the most common cause of dementia in the elderly, affecting about 26 million people worldwide, and whose prevalence has been calculated to quadruple by 2050 [1–3].
The first neuropathological case of a patient affected by AD was described over 100 years ago, and the presence of senile plaques and neurofibrillary tangles in the brain, two major hallmarks of AD, were described .
Senile plaques are characterized by the abnormal accumulation of amyloid β-peptide (Aβ) in the form of β-plated sheet fibrils, in nervous tissues and in blood vessels . Aβ is a 4 KDa hydrophobic molecule included into a much larger membrane glycoprotein, named amyloid precursor protein, APP , from which it is released upon limited proteolysis. Aβ can exist as monomer, dimer, oligomer, protofibril, and fibrillar aggregates . The propensity to self-association of Aβ seems to depend on the peptide’s primary sequence. Indeed the Aβ42, which makes up less than 10% of total Aβ, is more prone to aggregate than the more abundant Aβ40 .
Neurofibrillar tangles are mainly composed by a cytoskeletal microtubule-associated protein, called tau, that becomes hyperphosphorylated, dissociates from microtubules, and self-aggregates in the cytosol to form paired helical filaments. However, since hyperphosphorylated tau seems to be present also in other neurodegenerative diseases, and since all the currently identified genetic mutations responsible for AD invariably result in increased formation of fibrillogenic Aβ, the amyloid cascade hypothesis is the most widely accepted event for the pathogenesis of AD .
Two forms of AD have been described: a sporadic or senile form, and a familial (FAD) or presenil form. The former one develops in 95-98% of cases [10, 11], while the familial cases are limited to only 2-5%.
The onset of the sporadic form of AD typically occurs in patients after 65 years of age old, meanwhile the onset of familial form occurs generally before this age. No genes are directly responsible for the onset of the sporadic AD, but an association with polymorphisms of the gene ApoE have been reported [12, 13].
In nervous system APP plays major roles in synaptogenesis and synaptic plasticity. It is expressed in human brain, cerebrospinal fluid , kidney, spleen, heart and adrenal tissues , but it also is expressed in peripheral circulating cells as platelets . App gene contains 19 exons, and at least 10 different mRNA can be generated by alternative splicing. The most common isoforms inlcude APP695, predominantly expressed in neuronal tissues, and the isoforms APP751 and APP770 achieved by the insertion of a serine protease inhibitory domain of the Kunitz type family , which are abundantly expressed in non-neuronal cells [18–20].
APP is a type I transmembrane glycoprotein with a large extracellular N-terminal domain, and a short cytoplasmatic C-terminal domain . APP proteolitic processing is complex and results from the action of two alternative pathways that involve either α-secretase (non-amyloidogenic pathway) or β-secretase (amyloidogenic pathway), besides the γ-secretase complex [22, 23]. Only the amyloidogenic pathway generates and releases Aβ peptide, composed by 40–42 aminoacidic residues , while in the non-amyloidogenic pathway sAPPα which may have neuroprotective effects, is produced .
Platelets and alzheimer disease
Therefore, many researchers have focused their attention on platelets as a key peripheral element to understand the pathogenesis of AD.
Animal models are often a valuable tool in basic and biomedical research, and several studies on mice, Drosophila melanogaster, Caenorhabditis elegans and two types of fish, the sea lamprey and the zebrafish  have provided essential insights into the molecular mechanism of AD. Transgenic mice are also extremely useful to investigate platelet function, however so far no reports have addressed the platelet biology in the most common murine model for AD, such as the trangenic Tg2576 [31, 32] or the PD-APP transgenic mice [33, 34].
The metabolism of amyloid precursor protein in platelets
Human platelets contain high levels of APP, which may contribute to more than 90% of the circulating APP . Platelets show concentrations of APP isoforms equivalent to those found in brain , but the expression pattern is different: the isoform APP695, which is the most abundant in neuronal tissue, is nearly undetectable in platelets, where the predominant isoforms are APP770  and APP751 .
Platelet APP may represent the major source of Aβ detected in whole blood , and recent findings have suggested that platelet APP metabolism might also contribute to the accumulation of Aβ in the brain and its vasculature through the blood brain barrier [37, 38].
Intact APP is present on the platelet plasma membrane, and is encoded by platelet mRNA . In fact platelet APP is synthesized by the platelet precursor, the megakaryocyte, in the bone marrow, rather than being the result of platelet uptake of circulating APP . Platelets also express all the required enzymatic activities (α, β and γ-secretases) to produce all the APP metabolites (sAPPα sAPPβ and Aβ), that can be stored into intracellular granules . Proteolytic cleavage of platelet APP may occur both within intracellular organelles of the secretory pathway, and on the platelets’ surface [41, 42]. sAPPα and Aβ peptides can be stored in α-granules and released by exocytosis upon platelet activation by thrombin or collagen, which induce Ca2+-dependent degranulation [16, 20, 40–42].
Role of amyloid precursor protein in platelets
The physiological role of APP and of its metabolites in platelets is not yet well understood. The full-length APP may act as a receptor on the platelet surface, thanks to the cysteine-rich domain, KPI [14, 43]; platelet APP has also been proposed to be crucial in the regulation of intracellular Ca2+ concentration .
Several evidence indicate that platelet APP may play a role also in blood coagulation thanks to KPI domain, inhibiting the activity of the blood coagulation factors IXa, XIa, and Xa [45, 46]. Some studies indicate a physiological function for platelet-derived APP in wound repair and in the microenvironmental regulation of the coagulation cascade. In fact, APP possesses growth factor activity , and recombinant soluble forms of APP were demonstrated to inhibit platelet aggregation and secretion induced by ADP or adrenaline, indicating that platelet degranulation may result in a negative feedback regulation of platelet activation .
Atypical metabolism of amyloid precursor protein in coated-platelets
Coated-platelets are a recently described subset of platelets that originate upon dual stimulation of platelets with collagen and thrombin which retain more full length APP on their surface than platelets activated with a single agonist [49, 50]. Prodan and coworkers reported that there is an alteration of APP metabolism associated with the production of coated-platelets. Moreover, an altered production of coated-platelets in AD patients was also documented [51, 52]. This finding is in line with earlier works of Davies and coworkers. However they observed an alteration of coated-platelets formation only in the most severely affected AD patients, while Prodan, observed an increased propensity to form coated-platelets in the mildly affected AD patients, that reverted during the progression of the disease [51–53]. In a more recent study was shown that elevated coated-platelet levels in patients with anamnestic MCI are associated with increased risk for progression to AD .
Release of Aβ peptides by circulating platelets
The main species of Aβ released from activated human platelets is Aβ1-40. This is consistent with the observation that the circulating Aβ forms contributing to vascular amyloid deposits are primary composed by Aβ1-40, while the predominant form in neuronal plaques is Aβ1-42 [55–57]. Regarding the origin of Aβ peptides in blood, two major theories have been proposed: Davies and coworkers  suggested that circulating Aβ could derive from the central nervous system through the blood-CSF barrier, to become absorbed onto the surface blood cells, mostly platelets  and to a significantly lesser extend lymphocytes  and monocytes, which contain only about 5% of the total APP in blood . By contrast, others authors proposed that there is an additional release of Aβ from blood cells and from other non-neuronal cells [60, 61].
There is no doubt that Aβ peptides are actively released from platelets  and this process is significantly modulated by thrombin  and by PGE2 . Smirnov and coworkers identified several forms of Aβ peptide processed and secreted by stimulated and non-stimulated human platelets, including not only the classical Aβ peptides 1–40, 1–42, but also several additional shorter, carboxyl-terminally truncated forms (Aβ1-39, Aβ1-38, Aβ1-37, Aβ1-34), an amino-terminally truncated form (Aβ2-42) and a further not identified form, arbitrarily termed Aβ1-3X, which is probably an oxidized form of Aβ1-40 . All these different forms appear to be released with different kinetics. These observations are in agreement with the findings that a highly conserved pattern of Aβ peptides (Aβ1-37, Aβ1-38, Aβ1-39, Aβ1-40, Aβ1-42 ) was also described in cerebrospinal fluid [65, 66].
Platelet activation by Aβ peptides
Synthetic peptides have been very useful to study the pathophysiological properties of Aβ. Aβ25-3 is a synthetic peptide of 11 aminoacids located in the intermembrane domain of APP . Aβ25-35 cannot be produced through typical APP processing, but is often selected as an alternative model to full-length Aβ because it retains both its physical and biological properties; it aggregates with time, forming fibrils with β-structure  and retains the toxicity of the full-length peptide [68, 69]; moreover its short length readily allows derivatives to be synthesized and studied .
Aβ was able to activate platelets, and to trigger platelet aggregation by stimulating intracellular signaling pathways involving PLCγ2 phosphorylation, PKC activation and Ca2+ intracellular mobilization. Release of Aβ by activated platelets may represent a mechanism whereby Aβ deposition in the walls of blood vessels leads to angiopathy occuring in aging and AD [71, 72].
In vitro experiments showed that low doses of Aβ can potentiate agonist-induced platelet aggregation, and that higher doses are sufficient to directly trigger complete platelet aggregation . These effects were similarly elicited by both Aβ25-35 and Aβ1-40 peptides, and have been linked to specifically signaling pathways . The authors suggested a specific signaling pathway that initiates with the activation of the thrombin receptor PAR1 by Aβ and leads to the subsequent subsequent Ras/Raf, PI3Kinase and Akt cascade activation. Subsequent activation of p38MAPK leads to the stimulation of cPLA2, which catalyses the release of arachidonic acid for TXA2 synthesis . TxA2 is then able to trigger activation of platelets and the consequent secretion of Aβ, raising the possibility that Aβ activation of platelets may initiate a vicious cycle of platelet activation and Aβ release, which may play a relevant role in the development of cerebral amyloid angiopathy .
More recent works established a structure-activity relationship between the polymerization state of Aβ1-40 and its effects on platelet function: fibrillar Aβ1-40 increases ADP stimulated 5-HT serotonin efflux . In the presence of plasma Aβ1-40 fibrils were unable to potentiate platelet aggregation. Perhaps the interactions between plasma lipoproteins and Aβ peptides may represent a protective mechanism that reduces or blocks Aβ toxicity . It also been shown that Aβ1-40 fibrils cause platelets activation supporting platelet adhesion and aggregation via a mechanism that may involve the expression of platelet fibrinogen receptors [74, 75].
Platelets injury and Aβ release
Megakaryocytes are responsible for the production of platelets, by a massive cellular reorganization that leads to the formation of proplatelets. Proplatelets are extruded into the circulation where shear forces trigger their fragmentation, resulting in the release of platelets . It is widely accepted that to produce platelets, megakaryocytes deliberately activate apoptosis [77–80]. Moreover, recent studies have suggested that circulating platelets themselves can undergo apoptosis [81–83].
Activation of apoptotic pathways in platelets can be also stimulated with the proapoptotic agent ionomicyn. This leads to a significant increase in intraplatelet Aβ40, but not Aβ42 , leading to the hypothesis that activation of apoptotic pathways in platelets determines an altered processing of APP. Caspases are centrally involved in apoptosis, and some reports indicate the presence of caspase family enzymes in platelets and their activation by extracellular agonists or during prolonged storage [84, 85]. By western blot analysis, Casoli and coworkers detected inactive procaspase-3 in resting platelets. Interestingly, in ionomycin-treated platelets the proteolysed and active form of caspase-3 was detected , suggesting the initiation of apoptosis that eventually leads to overproduction of Aβ1-40. Thus, Aβ peptide production can be viewed as a consequence of a regular programmed cellular death.
Do platelets play a role in inflammatory processes in AD?
Besides having a key role in primary hemostasis, platelets play an important role in inflammatory processes. Among the most potent inflammatory signaling molecules secreted by platelets there are chemokines (such as platelet factor 4, PF4, RANTES, and MIP-1α, interleukins (IL-1β, IL-7 and IL-8), prostaglandins and CD40L . RANTES has been identified in platelets α-granules, are released after activation and their secretion from PBMC is increased in AD . MIP-1α is a chemokine found in platelet α-granules too. Its high levels in T-cells and brain microvessels of AD patients suggests that its upregulation could involve also platelets . The platelet endothelial cell adhesion molecules, PECAM-1 and ICAM-1, were shown to be higher in plasma of AD patients versus controls . These proteins are present in platelets and participate in trans-endothelial migration of leukocytes when Aβ peptide acts as an inflammatory stimulus [91, 92].
The uncontrolled activation of platelets in AD patients can result in a chronic inflammatory reaction that can mediate endothelial cell stress. This, in turn, may determine further platelet activation creating a vicious circle that causes increased inflammation and release of Aβ. An alternative hypothesis is that the systemic inflammation present in AD determines platelet activation, stabilizing a process that proceeds in a self-amplifying way .
Alteration of platelet sructure and function in ad
In contrast to cells of neuronal origin, which predominantly process APP via the β-secretase pathway, platelets, like other non-neuronal cells, favor processing by α-secretase. It is well established that sAPPα concentration in platelets is much higher than Aβ peptides .
In fact in addition to cause degranulation and release of stored APP soluble fragments, platelet stimulation promotes primarily the proteolysis of intact APP expressed on the cell surface through α-secretase activity. This process is supported by ADAM metalloproteinases, and causes the release of sAPPα. In co-immunoprecipitation and pull-down experiments a physical association between the intracellular Ca2+ sensor calmodulin and APP was documented, revealing a key role of calmodulin in the regulation of non-amyloidogenic processing of APP .
In a previous study Smith and collaborators, observed that α-secretase activity did not correlate with age, but it remained constant during the entire lifespan, while β-secretase activity in normal subjects significantly increased with age . Ageing is recognized as being the principal risk factor for AD , and it is possible that the pathological changes occurring in AD may initiate very early in life. Moreover the increase of platelet β-secretase activity did not correlate with mini-mental state examination (MMSE) score, indicating that it did not occur as a secondary result of the disease, and may even have preceded the onset of the symptoms . These findings corroborate what already founded for the brains and cerebrospinal fluid of patients affected by AD [97–99]. Other authors reported that platelets from AD patients actually express increased BACE1 activity compared to controls [100, 101]. In agreement with the increased β-secretase activity and decreased α-secretase activity, the Aβ levels have been found to be elevated in AD platelets samples . At the present, there are no studies reporting alteration of the γ-secretase activity in AD patients.
Membrane fluidity and cholesterol levels
Some years ago an alteration of platelet membrane fluidity in AD was reported. This alteration had been ascribed to alteration of the internal membranes rather than to abnormal phospholipids synthesis [103–107].
A slight decrease in platelet membrane cholesterol level in a small group of AD patients was reported . Recent evidence  proposed that increased membrane cholesterol results in increased β-secretase activity, that can generate more Aβ1-40. As predicted by other studies , increased Aβ1-40 may promote inhibition of HMG-CoA reductase, and reduce de-novo cholesterol biosynthesis. This model hypothesizes a negative feedback system between membrane β-secretase activity and membrane cholesterol level in AD. Therefore, it has been suggested that a perturbation of a possible physiological homeostatic link between membrane cholesterol level and membrane β-secretase activity may occur in AD. Treatment with statin may restore this link .
A key enzyme in platelets signal transduction is the phosphoinositide-specific phospholipase C, PLC. Its involvement in AD dates back some years ago when Shimohama and coworker demonstrated that the PLCδ-1 isoform abnormally accumulates in the brain in AD . Subsequently it was demonstrated that PLC activity was significantly lower in the AD platelets than in controls, suggesting an aberrant phosphoinositides metabolism in non-neuronal tissues . Moreover the activity of PLCδ1 isozyme is reduced in AD patient homozygous for apoE genotype carrying the ε 3 allele, but was normal in patients with the ε 4 allele .
Phospholipase A2, PLA2, plays an essential role in the metabolism of membrane phospholipids , but its activation can also stimulates the secretion of APP , and, on the other hand amyloid peptides are able to activate PLA2 in vitro . PLA2 activity was found to be increased in platelets from individuals with AD . These data conflict with those of other studies in which PLA2 activity in human platelets  as well as in human brain AD [119, 120] was found to be decreased in AD samples.
Serotonin levels and uptake
Several studies have reported abnormalities in the cellular content of serotonin in AD, as well as alterations of its uptake in different regions of the brains of AD patients [121, 122]. Studies performed on AD platelets reported confused results concerning the uptake of serotonin. While some works failed to detect any alteration in the level of serotonin in AD patients compared to controls , others documented a reduced uptake of serotonin into AD platelets [124, 125].
In accord to the diminished platelet serotonin concentration and increased plasma serotonin levels in patients with AD, Sevush and coworkers, observed that unstimulated platelets of AD patients exhibit greater activation of than those of controls . A recent work shows a persistently enhancement of platelets activation of AD patients, which may be related, on increased lipid peroxidation associated with inadequate levels of Vitamin E .
A straight correlation between the uptake of 5-hydroxytryptamine, 5-HT and cognitive state of the AD patients was also reported. A significantly lower concentrations of serotonin in platelets from AD patients was peculiar of those subjects in the late phase of AD. Hence, the decreased platelet serotonin concentration observed in the late phase of AD might be related to a reduced serotonin uptake .
Monoamine oxidase activity
Few studies performed on platelet MAO-B activity in AD yielded inconsistent but intresting results: Adolfsson and coworkers report increased MAO-B activity in platelets and brain of AD , while Ahlskog did not find any alteration of MAO-B activity in AD versus controls . More recent studies indicated that MAO-B activity might be used as a biomarker for the presence of psychotic features in AD , and for the early or late onset AD . In the above cited work by Muck-Seler and coworkers, the MAO-B activity was in line with serotonin concentration: significantly lower in patients in the late phase of AD compared to other phases of AD or healthy controls. Authors have found a positive correlation between MMSE scores and platelet MAO-B activity in AD, thus indicating that more severe AD symptoms are associated to lower MAO-B activity .
Current data suggest that protein kinase C, along with PI3K activity and Ca2+, is crucially involved in APP cleavage and secretion in human platelets, while COX is a minor component of APP secretion pathway. By contrast, Aβ release is totally independent of both PKC and COX activity, meanwhile Ca2+ plays an important role also in the release of Aβ .
Other evidence linked to the action of COX enzymes in brains, suggest a determinant role of COX as inflammatory marker in peripheral cells of AD, as platelets.
Activated platelets express almost exclusively, COX-1. COX-2 isozyme is normally undetectable in most tissue, but can be rapidly induced by proinflammatory or mitogenic stimuli. Elevated concentrations of circulating cytokines could upregulate COX-2 in megakaryocytes with a subsequent increase of it content in platelets. Bermejo and coworkers, reported an increased platelets levels of COX-2 in AD and MCI patients compared to elderly controls, indicating that platelet inflammatory pathways are activated, and that this could be considered an early event in AD development .
Nitric oxide synthase and free radicals generation
Oxidative stress has been widely implicated both in ageing and in pathogenesis of several neurodegenerative disorders, including AD. Some studies showed an increase of nitric oxide, NO and peroxynitrite anion, ONOO-, production exclusively in platelets obtained from AD patients, that was associated to a decreased Na+/K+-ATPase activity in AD patients platelet membrane . In a vertical study, nitric oxide syntase, NOS, activity, was measured in platelets of young controls, aged controls and AD patients, and a significant increase was seen when AD were compared with aged controls and, more significant, when compared with young controls . In a study performed on mild and moderate AD patients, platelet aggregation was found to be potentiated, and this was paralleled by a decline of endothelial, constitutive NOS activity, causing a reduction of the NO concentration in platelets. This reduction was proposed to be responsible for the increased aggregation in AD patients, since NO can inhibit platelet aggregation . This model, however, is in contrast with the well documented notion that NO concentration and NOS activity is higher in AD than controls. Therefore, additional works are necessary to determine the role of NO system in AD platelets.
Alteration of APP processing
The alteration of APP processing in platelets from AD patients was investigated at least by three different groups, who measured the ratio between the different types (or isoforms) of APP detectable in platelets on the basis of a different apparent molecular mass on SDS-PAGE.
Rosenberg and coworkers determined the ratio of the 120–130 KDa APP isoform to the 110 KDa APP isoform, and showed that APP processing in AD platelets is compromised compared to that of control subjects [101, 137, 138]. The authors propose that this difference may reflect chronic platelet activation in patients with AD. They also determined a direct correlation between the cognitive decline by MMSE scores in AD patients during three years of follow-up and APP isoform ratio reduction.
Liu and coworkers revealed that AD patients whose MMSE scores declined in one year, had a greater reduction in platelet APP isoforms ratio than patients whose MMSE scores did not decline .
An altered ratio among the different APP isoforms detectable in platelets from AD patients was confirmed by many other studies [59, 140, 141], as it was the demonstration of a positive correlation between APP ratios and the progression of clinical symptoms, suggesting that this peripheral parameter may be a marker of progression of the disease.
Subsequently studies reported that platelets of patients carrying the mutation Met293Val in PS2 protein did not show altered expression of APP isoforms ratio pattern conversely to what reported for sporadic AD patients .
It was demonstrated an association between early stages of AD, or of Mild Cognitive Impairment, MCI, with a reduction in platelet APP isoforms ratio, and suggested that, since alteration of APP processing may be an early event in AD, the characterization of APP ratio in platelet could have a great diagnostic power [8, 143–145]. In conclusion, platelet APP isoforms ratio may be a very important AD biomarker, as its evaluation is reliable and simple test to be performed.
Initially identified as an exclusively brain tissue disorder, in the last decades, AD, was revaluated as a more intriguing disorder involving many other peripheral tissues and molecules in the organism. In fact, it is now well established that biochemical alterations in AD patients do not occur only in the brain, but even in blood vessels and blood cells. Nowday researchers have recognized that platelets are the principal components of human blood to be affected not only in the onset but even in the progression of AD. Platelets seem to mirror what happens in nervous tissue during the evolution of AD, and therefore represent the cellular type where to identified the early events in the onset of the disorder. Differently from neurons, platelets can be easily accessible and constitute a valid cellular tool to study the pathogenesis of AD. In this review we have summarized the limited and often discordant results reported by different authors in recent years. Overall all these studies, both in vivo and in vitro, are aimed to understand in which way affected proteins, enzymes, signal transduction pathways, inflammatory processes, spontaneous activation are important in platelets to better define the molecular pathogenesis of AD. Platelets are primary the principal authors of hemostasis in the organism, but they also play a key role in Alzheimer Disease still remaining a potential marker to understand the diagnosis of the disorder.
- Yankner BA, Mesulam MM: Beta-Amyloid and the pathogenesis of Alzheimer's disease. Seminars in medicine of the Beth Israel Hospital, Boston. New England Journal Medical. 1991, 325 (26): 1849-1857. ReviewGoogle Scholar
- Selkoe DJ: The molecular pathology of Alzheimer's disease. Neuron. 1991, 6 (4): 487-498. ReviewPubMedView ArticleGoogle Scholar
- Hampel H, Frank R, Broich K, Teipel SJ, Katz RG, Hardy J, Herholz K, Bokde AL, Jessen F, Hoessler YC, Sanhai WR, Zetterberg H, Woodcock J, Blennow K: Biomarkers for Alzheimer's disease: academic, industry and regulatory perspectives. Nat Rev Drug Discov. 2010, 9 (7): 560-574. ReviewPubMedView ArticleGoogle Scholar
- Alzheimer A: Uber eine eigenartige Erkrankung der Hirnrinde. Allg Zeitschr Psychiatr. 1907, 64: 146-148.Google Scholar
- Maccioni RB, Muñoz JP, Barbeito L: The molecular bases of Alzheimer's disease and other neurodegenerative disorders. Arch Med Res. 2001, 32 (5): 367-381. ReviewPubMedView ArticleGoogle Scholar
- Fraser SP, Suh YH, Djamgoz MB: Ionic effects of the Alzheimer's disease beta-amyloid precursor protein and its metabolic fragments. Trends Neurosci. 1997, 20 (2): 67-72. ReviewPubMedView ArticleGoogle Scholar
- Walsh DM, Selkoe DJ: A beta oligomers-a decade of discovery. J Neurochem. 2007, 101 (5): 1172-1184. ReviewPubMedView ArticleGoogle Scholar
- Hampel H, Shen Y, Walsh DM, Aisen P, Shaw LM, Zetterberg H, Trojanowski JQ, Blennow K: Biological markers of amyloid beta-related mechanisms in Alzheimer's disease. Exp Neurol. 2010, 223 (2): 334-346.PubMed CentralPubMedView ArticleGoogle Scholar
- Borroni B, Colciaghi F, Corsini P, Akkawi N, Rozzini L, Del Zotto E, Talarico G, Cattabeni F, Lenzi GL, Di Luca M, Padovani A: Early stages of probable Alzheimer disease are associated with changes in platelet amyloid precursor protein forms. Neurol Sci. 2002, 23 (5): 207-210.PubMedView ArticleGoogle Scholar
- Bird TD: Genetic factors in Alzheimer's disease. N Engl J Med. 2005, 352 (9): 862-864.PubMedView ArticleGoogle Scholar
- Turner RS: Alzheimer's disease. Semin Neurol. 2006, 26 (5): 499-506.PubMedView ArticleGoogle Scholar
- Corder EH, Saunders AM, Strittmatter WJ, Schmechel DE, Gaskell PC, Small GW, Roses AD, Haines JL, Pericak-Vance MA: Gene dose of apolipoprotein E type 4 allele and the risk of Alzheimer's disease in late onset families. Science. 1993, 261 (5123): 921-923.PubMedView ArticleGoogle Scholar
- Strittmatter WJ, Weisgraber KH, Huang DY, Dong LM, Salvesen GS, Pericak-Vance M, Schmechel D, Saunders AM, Goldgaber D, Roses AD: Binding of human apolipoprotein E to synthetic amyloid beta peptide: isoform-specific effects and implications for late-onset Alzheimer disease. Proc Natl Acad Sci U S A. 1993, 90 (17): 8098-8102.PubMed CentralPubMedView ArticleGoogle Scholar
- Weidemann A, König G, Bunke D, Fischer P, Salbaum JM, Masters CL, Beyreuther K: Identification, biogenesis, and localization of precursors of Alzheimer's disease A4 amyloid protein. Cell. 1989, 57 (1): 115-126.PubMedView ArticleGoogle Scholar
- Selkoe DJ, Podlisny MB, Joachim CL, Vickers EA, Lee G, Fritz LC, Oltersdorf T: Beta-amyloid precursor protein of Alzheimer disease occurs as 110- to 135-kilodalton membrane-associated proteins in neural and nonneural tissues. Proc Natl Acad Sci U S A. 1988, 85 (19): 7341-7345.PubMed CentralPubMedView ArticleGoogle Scholar
- Bush AI, Martins RN, Rumble B, Moir R, Fuller S, Milward E, Currie J, Ames D, Weidemann A, Fischer P, Multhaup G, Beyreuther K, Masters CL: The amyloid precursor protein of Alzheimer's disease is released by human platelets. J Biol Chem. 1990, 265 (26): 15977-15983.PubMedGoogle Scholar
- Tanzi RE, McClatchey AI, Lamperti ED, Villa-Komaroff L, Gusella JF, Neve RL: Protease inhibitor domain encoded by an amyloid protein precursor mRNA associated with Alzheimer's disease. Nature. 1988, 331 (6156): 528-530.PubMedView ArticleGoogle Scholar
- Li QX, Fuller SJ, Beyreuther K, Masters CL: The amyloid precursor protein of Alzheimer disease in human brain and blood. J Leukoc Biol. 1999, 66 (4): 567-574. ReviewPubMedGoogle Scholar
- Golde TE, Estus S, Usiak M, Younkin LH, Younkin SG: Expression of beta amyloid protein precursor mRNAs: recognition of a novel alternatively spliced form and quantitation in Alzheimer's disease using PCR. Neuron. 1990, 4 (2): 253-267.PubMedView ArticleGoogle Scholar
- Li QX, Berndt MC, Bush AI, Rumble B, Mackenzie I, Friedhuber A, Beyreuther K, Masters CL: Membrane-associated forms of the beta A4 amyloid protein precursor of Alzheimer's disease in human platelet and brain: surface expression on the activated human platelet. Blood. 1994, 84 (1): 133-142.PubMedGoogle Scholar
- Kang J, Lemaire HG, Unterbeck A, Salbaum JM, Masters CL, Grzeschik KH, Multhaup G, Beyreuther K, Müller-Hill B: The precursor of Alzheimer's disease amyloid A4 protein resembles a cell-surface receptor. Nature. 1987, 325 (6106): 733-736.PubMedView ArticleGoogle Scholar
- Evin G, Weidemann A: Biogenesis and metabolism of Alzheimer's disease Abeta amyloid peptides. Peptides. 2002, 23 (7): 1285-1297.PubMedView ArticleGoogle Scholar
- Gralle M, Ferreira ST: Structure and functions of the human amyloid precursor protein: the whole is more than the sum of its parts. Prog Neurobiol. 2007, 82 (1): 11-32.PubMedView ArticleGoogle Scholar
- Golde TE, Cai XD, Shoji M, Younkin SG: Production of amyloid beta protein from normal amyloid beta-protein precursor (beta APP) and the mutated beta APPS linked to familial Alzheimer's disease. Ann N Y Acad Sci. 1993, 695: 103-108. ReviewPubMedView ArticleGoogle Scholar
- Gralle M, Botelho MG, Wouters FS: Neuroprotective secreted amyloid precursor protein acts by disrupting amyloid precursor protein dimers. J Biol Chem. 2009, 284 (22): 15016-15025.PubMed CentralPubMedView ArticleGoogle Scholar
- Racchi M, Govoni S: The pharmacology of amyloid precursor protein processing. Exp Gerontol. 2003, 38 (1–2): 145-157. ReviewPubMedView ArticleGoogle Scholar
- Kroll MH, Schafer AI: Biochemical mechanisms of platelet activation. Blood. 1989, 74 (4): 1181-1195.PubMedGoogle Scholar
- Cupello A, Favale E, Audenino D, Scarrone S, Gastaldi S, Albano C: Decrease of serotonin transporters in blood platelets after epileptic seizures. Neurochem Res. 2005, 30 (4): 425-428.PubMedView ArticleGoogle Scholar
- Rainesalo S, Keränen T, Saransaari P, Honkaniemi J: GABA and glutamate transporters are expressed in human platelets. Brain Res Mol Brain Res. 2005, 141 (2): 161-165.PubMedView ArticleGoogle Scholar
- Götz J, Ittner LM: Animal models of Alzheimer's disease and frontotemporal dementia. Nat Rev Neurosci. 2008, 9 (7): 532-544. ReviewPubMedView ArticleGoogle Scholar
- D'Amelio M, Cavallucci V, Middei S, Marchetti C, Pacioni S, Ferri A, Diamantini A, De Zio D, Carrara P, Battistini L, Moreno S, Bacci A, Ammassari-Teule M, Marie H, Cecconi F: Caspase-3 triggers early synaptic dysfunction in a mouse model of Alzheimer's disease. Nat Neurosci. 2011, 14 (1): 69-76.PubMedView ArticleGoogle Scholar
- Jacobsen JS, Wu CC, Redwine JM, Comery TA, Arias R, Bowlby M, Martone R, Morrison JH, Pangalos MN, Reinhart PH, Bloom FE: Early-onset behavioral and synaptic deficits in a mouse model of Alzheimer's disease. Proc Natl Acad Sci U S A. 2006, 103 (13): 5161-5166.PubMed CentralPubMedView ArticleGoogle Scholar
- Cruz JC, Kim D, Moy LY, Dobbin MM, Sun X, Bronson RT, Tsai LH: p25/cyclin-dependent kinase 5 induces production and intraneuronal accumulation of amyloid beta in vivo. J Neurosci. 2006, 26 (41): 10536-10541.PubMedView ArticleGoogle Scholar
- Qin RA, Yao XX, Huang ZY: Effects of compound danshen tablets on spatial cognition and expression of brain beta-amyloid precursor protein in a rat model of Alzheimer's disease. J Tradit Chin Med. 2012, 32 (1): 63-66.PubMedView ArticleGoogle Scholar
- Li QX, Evin G, Small DH, Multhaup G, Beyreuther K, Masters CL: Proteolytic processing of Alzheimer's disease beta A4 amyloid precursor protein in human platelets. J Biol Chem. 1995, 270 (23): 14140-14147.PubMedView ArticleGoogle Scholar
- Chen M, Inestrosa NC, Ross GS, Fernandez HL: Platelets are the primary source of amyloid beta-peptide in human blood. Biochem Biophys Res Commun. 1995, 213 (1): 96-103.PubMedView ArticleGoogle Scholar
- Deane R, Zlokovic BV: Role of the blood–brain barrier in the pathogenesis of Alzheimer's disease. Curr Alzheimer Res. 2007, 4 (2): 191-197. ReviewPubMedView ArticleGoogle Scholar
- Roher AE, Esh CL, Kokjohn TA, Castaño EM, Van Vickle GD, Kalback WM, Patton RL, Luehrs DC, Daugs ID, Kuo YM, Emmerling MR, Soares H, Quinn JF, Kaye J, Connor DJ, Silverberg NB, Adler CH, Seward JD, Beach TG, Sabbagh MN: Amyloid beta peptides in human plasma and tissues and their significance for Alzheimer's disease. Alzheimers Dement. 2009, 5 (1): 18-29.PubMed CentralPubMedView ArticleGoogle Scholar
- Gardella JE, Ghiso J, Gorgone GA, Marratta D, Kaplan AP, Frangione B, Gorevic PD: Intact Alzheimer amyloid precursor protein (APP) is present in platelet membranes and is encoded by platelet mRNA. Biochem Biophys Res Commun. 1990, 173 (3): 1292-1298.PubMedView ArticleGoogle Scholar
- Li QX, Whyte S, Tanner JE, Evin G, Beyreuther K, Masters CL: Secretion of Alzheimer's disease Abeta amyloid peptide by activated human platelets. Lab Invest. 1998, 78 (4): 461-469.PubMedGoogle Scholar
- Smith CCT: Stimulated release of the b-amyloid protein of Alzheimer’s disease by normal human platelets. Neurosc Lett. 1997, 235: 157-159.View ArticleGoogle Scholar
- Evin G, Zhu A, Holsinger RM, Masters CL, Li QX: Proteolytic processing of the Alzheimer's disease amyloid precursor protein in brain and platelets. J Neurosci Res. 2003, 74 (3): 386-392.PubMedView ArticleGoogle Scholar
- Kitaguchi N, Takahashi Y, Tokushima Y, Shiojiri S, Ito H: Novel precursor of Alzheimer's disease amyloid protein shows protease inhibitory activity. Nature. 1988, 331 (6156): 530-532.PubMedView ArticleGoogle Scholar
- Mattson MP: Calcium and neuronal injury in Alzheimer's disease. Contributions of beta-amyloid precursor protein mismetabolism, free radicals, and metabolic compromise. Ann N Y Acad Sci. 1994, 747: 50-76. ReviewPubMedView ArticleGoogle Scholar
- Van Nostrand WE, Schmaier AH, Wagner SL: Potential role of protease nexin-2/amyloid beta-protein precursor as a cerebral anticoagulant. Ann N Y Acad Sci. 1992, 674: 243-252. ReviewPubMedView ArticleGoogle Scholar
- Mahdi F, Van Nostrand WE, Schmaier AH: Protease nexin-2/amyloid beta-protein precursor inhibits factor Xa in the prothrombinase complex. J Biol Chem. 1995, 270 (40): 23468-23474.PubMedView ArticleGoogle Scholar
- Milward EA, Papadopoulos R, Fuller SJ, Moir RD, Small D, Beyreuther K, Masters CL: The amyloid protein precursor of Alzheimer's disease is a mediator of the effects of nerve growth factor on neurite outgrowth. Neuron. 1992, 9 (1): 129-137.PubMedView ArticleGoogle Scholar
- Henry A, Li QX, Galatis D, Hesse L, Multhaup G, Beyreuther K, Masters CL, Cappai R: Inhibition of platelet activation by the Alzheimer's disease amyloid precursor protein. Br J Haematol. 1998, 103 (2): 402-415.PubMedView ArticleGoogle Scholar
- Alberio L, Safa O, Clemetson KJ, Esmon CT, Dale GL: Surface expression and functional characterization of alpha-granule factor V in human platelets: effects of ionophore A23187, thrombin, collagen, and convulxin. Blood. 2000, 95 (5): 1694-1702.PubMedGoogle Scholar
- Dale GL: Coated-platelets: an emerging component of the procoagulant response. J Thromb Haemost. 2005, 3 (10): 2185-2192. ReviewPubMedView ArticleGoogle Scholar
- Prodan CI, Szasz R, Vincent AS, Ross ED, Dale GL: Coated-platelets retain amyloid precursor protein on their surface. Platelets. 2006, 17 (1): 56-60.PubMedView ArticleGoogle Scholar
- Prodan CI, Ross ED, Vincent AS, Dale GL: Coated-platelets correlate with disease progression in Alzheimer disease. J Neurol. 2007, 254 (4): 548-549.PubMedView ArticleGoogle Scholar
- Davies TA, Long HJ, Sgro K, Rathbun WH, McMenamin ME, Seetoo K, Tibbles H, Billingslea AM, Fine RE, Fishman JB, Levesque CA, Smith SJ, Wells JM, Simons ER: Activated Alzheimer disease platelets retain more beta amyloid precursor protein. Neurobiol Aging. 1997, 18 (2): 147-153.PubMedView ArticleGoogle Scholar
- Prodan CI, Ross ED, Stoner JA, Cowan LD, Vincent AS, Dale GL: Coated-platelet levels and progression from mild cognitive impairment to Alzheimer disease. Neurology. 2011, 76: 247-252.PubMed CentralPubMedView ArticleGoogle Scholar
- Skovronsky DM, Lee VM, Praticò D: Amyloid precursor protein and amyloid beta peptide in human platelets. Role of cyclooxygenase and protein kinase C. J Biol Chem. 2001, 276 (20): 17036-17043.PubMedView ArticleGoogle Scholar
- Herzig MC, Winkler DT, Burgermeister P, Pfeifer M, Kohler E, Schmidt SD, Danner S, Abramowski D, Stürchler-Pierrat C, Bürki K, van Duinen SG, Maat-Schieman ML, Staufenbiel M, Mathews PM, Jucker M: Abeta is targeted to the vasculature in a mouse model of hereditary cerebral hemorrhage with amyloidosis. Nat Neurosci. 2004, 7 (9): 954-960.PubMedView ArticleGoogle Scholar
- Fryer JD, Holtzman DM: The bad seed in Alzheimer's disease. Neuron. 2005, 47 (2): 167-168.PubMedView ArticleGoogle Scholar
- Davies TA, Long HJ, Eisenhauer PB, Hastey R, Cribbs DH, Fine RE, Simons ER: Beta amyloid fragments derived from activated platelets deposit in cerebrovascular endothelium: usage of a novel blood brain barrier endothelial cell model system. Amyloid. 2000, 7 (3): 153-165.PubMedView ArticleGoogle Scholar
- Giri R, Selvaraj S, Miller CA, Hofman F, Yan SD, Stern D, Zlokovic BV, Kalra VK: Effect of endothelial cell polarity on beta-amyloid-induced migration of monocytes across normal and AD endothelium. Am J Physiol Cell Physiol. 2002, 283 (3): C895-C904.PubMedView ArticleGoogle Scholar
- Di Luca M, Colciaghi F, Pastorino L, Borroni B, Padovani A, Cattabeni F: Platelets as a peripheral district where to study pathogenetic mechanisms of alzheimer disease: the case of amyloid precursor protein. Eur J Pharmacol. 2000, 405 (1–3): 277-283. ReviewPubMedView ArticleGoogle Scholar
- Pluta R: Blood–brain barrier dysfunction and amyloid precursor protein accumulation in microvascular compartment following ischemia-reperfusion brain injury with 1-year survival. Acta Neurochir Suppl. 2003, 86: 117-122.PubMedGoogle Scholar
- Smirnov A, Trupp A, Henkel AW, Bloch E, Reulbach U, Lewczuk P, Riggert J, Kornhuber J, Wiltfang J: Differential processing and secretion of Abeta peptides and sAPPalpha in human platelets is regulated by thrombin and prostaglandine 2. Neurobiol Aging. 2009, 30 (10): 1552-1562.PubMedView ArticleGoogle Scholar
- Casoli T, Di Stefano G, Giorgetti B, Grossi Y, Balietti M, Fattoretti P, Bertoni-Freddari C: Release of beta-amyloid from high-density platelets: implications for Alzheimer's disease pathology. Ann N Y Acad Sci. 2007, 1096: 170-178.PubMedView ArticleGoogle Scholar
- Gray SJ, Heptinstall S: The effects of PGE2 and CL 115,347, an antihypertensive PGE2 analogue, on human blood platelet behaviour and vascular contractility. Eur J Pharmacol. 1985, 114 (2): 129-137.PubMedView ArticleGoogle Scholar
- Wiltfang J, Smirnov A, Schnierstein B, Kelemen G, Matthies U, Klafki HW, Staufenbiel M, Hüther G, Rüther E, Kornhuber J: Improved electrophoretic separation and immunoblotting of beta-amyloid (A beta) peptides 1–40, 1–42, and 1–43. Electrophoresis. 1997, 18 (3–4): 527-532.PubMedView ArticleGoogle Scholar
- Wiltfang J, Esselmann H, Smirnov A, Bibl M, Cepek L, Steinacker P, Mollenhauer B, Buerger K, Hampel H, Paul S, Neumann M, Maler M, Zerr I, Kornhuber J, Kretzschmar HA, Poser S, Otto M: Beta-amyloid peptides in cerebrospinal fluid of patients with Creutzfeldt-Jakob disease. Ann Neurol. 2003, 54 (2): 263-267.PubMedView ArticleGoogle Scholar
- Del Mar Martínez-Senac M, Villalaín J, Gómez-Fernández JC: Structure of the Alzheimer beta-amyloid peptide (25–35) and its interaction with negatively charged phospholipid vesicles. Eur J Biochem. 1999, 265 (2): 744-753.PubMedView ArticleGoogle Scholar
- Iversen LL, Mortishire-Smith RJ, Pollack SJ, Shearman MS: The toxicity in vitro of beta-amyloid protein. Biochem J. 1995, 311 (Pt 1): 1-16. ReviewPubMed CentralPubMedView ArticleGoogle Scholar
- Terzi E, Hölzemann G, Seelig J: Alzheimer beta-amyloid peptide 25–35: electrostatic interactions with phospholipid membranes. Biochemistry. 1994, 33 (23): 7434-7441.PubMedView ArticleGoogle Scholar
- Hughes E, Burke RM, Doig AJ: Inhibition of toxicity in the beta-amyloid peptide fragment beta -(25–35) using N-methylated derivatives: a general strategy to prevent amyloid formation. J Biol Chem. 2000, 275 (33): 25109-25115.PubMedView ArticleGoogle Scholar
- Shen MY, Hsiao G, Fong TH, Chou DS, Sheu JR: Expression of amyloid beta peptide in human platelets: pivotal role of the phospholipase Cgamma2-protein kinase C pathway in platelet activation. Pharmacol Res. 2008, 57 (2): 151-158.PubMedView ArticleGoogle Scholar
- Thomas T, Thomas G, McLendon C, Sutton T, Mullan M: eta-Amyloid-mediated vasoactivity and vascular endothelial damage. Nature. 1996, 380 (6570): 168-171.PubMedView ArticleGoogle Scholar
- Shen MY, Hsiao G, Fong TH, Chen HM, Chou DS, Lin CH, Sheu JR, Hsu CY: Amyloid beta peptide-activated signal pathways in human platelets. Eur J Pharmacol. 2008, 588 (2–3): 259-266.PubMedView ArticleGoogle Scholar
- Bugaud F, Nadal-Wollbold F, Lévy-Toledano S, Rosa JP, Bryckaert M: Regulation of c-jun-NH2 terminal kinase and extracellular-signal regulated kinase in human platelets. Blood. 1999, 94 (11): 3800-3805.PubMedGoogle Scholar
- Coulon L, Calzada C, Moulin P, Véricel E, Lagarde M: Activation of p38 mitogen-activated protein kinase/cytosolic phospholipase A2 cascade in hydroperoxide-stressed platelets. Free Radic Biol Med. 2003, 35 (6): 616-625.PubMedView ArticleGoogle Scholar
- Italiano JE, Lecine P, Shivdasani RA, Hartwig JH: Blood platelets are assembled principally at the ends of proplatelet processes produced by differentiated megakaryocytes. J Cell Biol. 1999, 147 (6): 1299-1312.PubMed CentralPubMedView ArticleGoogle Scholar
- Kaluzhny Y, Ravid K: Role of apoptotic processes in platelet biogenesis. Acta Haematol. 2004, 111 (1–2): 67-77.PubMedView ArticleGoogle Scholar
- Fadeel B, Orrenius S: Apoptosis: a basic biological phenomenon with wide-ranging implications in human disea. J Intern Med. 2005, 258 (6): 479-517. ReviewPubMedView ArticleGoogle Scholar
- Patel SR, Hartwig JH, Italiano JE: The biogenesis of platelets from megakaryocyte proplatelets. J Clin Invest. 2005, 115 (12): 3348-3354. ReviewPubMed CentralPubMedView ArticleGoogle Scholar
- Josefsson EC, James C, Henley KJ, Debrincat MA, Rogers KL, Dowling MR, White MJ, Kruse EA, Lane RM, Ellis S, Nurden P, Mason KD, O'Reilly LA, Roberts AW, Metcalf D, Huang DC, Kile BT: Megakaryocytes possess a functional intrinsic apoptosis pathway that must be restrained to survive and produce platelets. J Exp Med. 2011, 208 (10): 2017-2031.PubMed CentralPubMedView ArticleGoogle Scholar
- Brown SB, Clarke MC, Magowan L, Sanderson H, Savill J: Constitutive death of platelets leading to scavenger receptor-mediated phagocytosis. A caspase-independent cell clearance program. J Biol Chem. 2000, 275 (8): 5987-5996.PubMedView ArticleGoogle Scholar
- Pereira J, Soto M, Palomo I, Ocqueteau M, Coetzee LM, Astudillo S, Aranda E, Mezzano D: Platelet aging in vivo is associated with activation of apoptotic pathways: studies in a model of suppressed thrombopoiesis in dogs. Thromb Haemost. 2002, 87 (5): 905-909.PubMedGoogle Scholar
- Rand ML, Wang H, Bang KW, Poon KS, Packham MA, Freedman J: Procoagulant surface exposure and apoptosis in rabbit platelets: association with shortened survival and steady-state senescence. J Thromb Haemost. 2004, 2 (4): 651-659.PubMedView ArticleGoogle Scholar
- Shcherbina A, Remold-O'Donnell E: Role of caspase in a subset of human platelet activation responses. Blood. 1999, 93 (12): 4222-4231.PubMedGoogle Scholar
- Plenchette S, Moutet M, Benguella M, N'Gondara JP, Guigner F, Coffe C, Corcos L, Bettaieb A, Solary E: Early increase in DcR2 expression and late activation of caspases in the platelet storage lesion. Leukemia. 2001, 15 (10): 1572-1581.PubMedView ArticleGoogle Scholar
- Wolf BB, Goldstein JC, Stennicke HR, Beere H, Amarante-Mendes GP, Salvesen GS, Green DR: Calpain functions in a caspase-independent manner to promote apoptosis-like events during platelet activation. Blood. 1999, 94 (5): 1683-1692.PubMedGoogle Scholar
- Klinger MH: Platelets and inflammation. Anat Embryol (Berl). 1997, 196 (1): 1-11. ReviewView ArticleGoogle Scholar
- Iarlori C, Gambi D, Gambi F, Lucci I, Feliciani C, Salvatore M, Reale M: Expression and production of two selected beta-chemokines in peripheral blood mononuclear cells from patients with Alzheimer's disease. Exp Gerontol. 2005, 40 (7): 605-611.PubMedView ArticleGoogle Scholar
- Casoli T, Di Stefano G, Balietti M, Solazzi M, Giorgetti B, Fattoretti P: Peripheral inflammatory biomarkers of Alzheimer's disease: the role of platelets. Biogerontology. 2010, 11 (5): 627-633. ReviewPubMedView ArticleGoogle Scholar
- Nielsen HM, Londos E, Minthon L, Janciauskiene SM: Soluble adhesion molecules and angiotensin-converting enzyme in dementia. Neurobiol Dis. 2007, 26 (1): 27-35.PubMedView ArticleGoogle Scholar
- Giri R, Shen Y, Stins M, Du Yan S, Schmidt AM, Stern D, Kim KS, Zlokovic B, Kalra VK: Beta-amyloid-induced migration of monocytes across human brain endothelial cells involves RAGE and PECAM-1. Am J Physiol Cell Physiol. 2000, 279 (6): C1772-C1781.PubMedGoogle Scholar
- Suo Z, Tan J, Placzek A, Crawford F, Fang C, Mullan M: Alzheimer's beta-amyloid peptides induce inflammatory cascade in human vascular cells: the roles of cytokines and CD40. Brain Res. 1998, 807 (1–2): 110-117.PubMedView ArticleGoogle Scholar
- Canobbio I, Catricalà S, Balduini C, Torti M: Calmodulin regulates the non-amyloidogenic metabolism of amyloid precursor protein in platelets. Biochim Biophys Acta. 2011, 1813 (3): 500-506.PubMedView ArticleGoogle Scholar
- Smith CC, Prichard BN, Cooper MB: Platelet alpha- and beta-secretase activities: A preliminary study in normal human subjects. Platelets. 2009, 20 (1): 29-34.PubMedView ArticleGoogle Scholar
- Carr DB, Goate A, Phil D, Morris JC: Current concepts in the pathogenesis of Alzheimer's disease. Am J Med. 1997, 103 (3A): 3S-10S. ReviewPubMedView ArticleGoogle Scholar
- Johnston JA, Liu WW, Coulson DT, Todd S, Murphy S, Brennan S, Foy CJ, Craig D, Irvine GB, Passmore AP: Platelet beta-secretase activity is increased in Alzheimer's disease. Neurobiol Aging. 2008, 29 (5): 661-668.PubMedView ArticleGoogle Scholar
- Fukumoto H, Cheung BS, Hyman BT, Irizarry MC: Beta-secretase protein and activity are increased in the neocortex in Alzheimer disease. Arch Neurol. 2002, 59 (9): 1381-1389.PubMedView ArticleGoogle Scholar
- Li R, Lindholm K, Yang LB, Yue X, Citron M, Yan R, Beach T, Sue L, Sabbagh M, Cai H, Wong P, Price D, Shen Y: Amyloid beta peptide load is correlated with increased beta-secretase activity in sporadic Alzheimer's disease patients. Proc Natl Acad Sci U S A. 2004, 101 (10): 3632-3637.PubMed CentralPubMedView ArticleGoogle Scholar
- Holsinger RM, McLean CA, Collins SJ, Masters CL, Evin G: Increased beta-Secretase activity in cerebrospinal fluid of Alzheimer's disease subjects. Ann Neurol. 2004, 55 (6): 898-899.PubMedView ArticleGoogle Scholar
- Colciaghi F, Borroni B, Pastorino L, Marcello E, Zimmermann M, Cattabeni F, Padovani A, Di Luca M: [alpha]-Secretase ADAM10 as well as [alpha]APPs is reduced in platelets and CSF of Alzheimer disease patients. Mol Med. 2002, 8 (2): 67-74.PubMed CentralPubMedGoogle Scholar
- Colciaghi F, Marcello E, Borroni B, Zimmermann M, Caltagirone C, Cattabeni F, Padovani A, Di Luca M, Platelet APP: ADAM 10 and BACE alterations in the early stages of Alzheimer disease. Neurology. 2004, 62 (3): 498-501.PubMedView ArticleGoogle Scholar
- Tang K, Hynan LS, Baskin F, Rosenberg RN: Platelet amyloid precursor protein processing: a bio-marker for Alzheimer's disease. J Neurol Sci. 2006, 240 (1–2): 53-58.PubMed CentralPubMedGoogle Scholar
- Zubenko GS, Cohen BM, Boller F, Malinakova I, Keefe N, Chojnacki B: Platelet membrane abnormality in Alzheimer's disease. Ann Neurol. 1987, 22 (2): 237-244.PubMedView ArticleGoogle Scholar
- Zubenko GS, Brenner RP, Teply I: Risk factors for stroke as predictors of platelet membrane fluidity in Alzheimer's disease. Stroke. 1991, 22 (8): 997-1003.PubMedView ArticleGoogle Scholar
- Hajimohammadreza I, Brammer MJ, Eagger S, Burns A, Levy R: Platelet and erythrocyte membrane changes in Alzheimer's disease. Biochim Biophys Acta. 1990, 1025 (2): 208-214.PubMedView ArticleGoogle Scholar
- Kanof PD, Mohs RC, Gross J, Davidson M, Bierer LM, Davis KL: Platelet phospholipid synthesis in Alzheimer's disease. Neurobiol Aging. 1991, 12 (1): 65-69.PubMedView ArticleGoogle Scholar
- Piletz JE, Sarasua M, Whitehouse P, Chotani M: Intracellular membranes are more fluid in platelets of Alzheimer's disease patients. Neurobiol Aging. 1991, 12 (5): 401-406.PubMedView ArticleGoogle Scholar
- Cohen BM, Zubenko GS, Babb SM: Abnormal platelet membrane composition in Alzheimer's-type dementia. Life Sci. 1987, 40 (25): 2445-2451.PubMedView ArticleGoogle Scholar
- Liu WW, Todd S, Coulson DT, Irvine GB, Passmore AP, McGuinness B, McConville M, Craig D, Johnston JA: A novel reciprocal and biphasic relationship between membrane cholesterol and beta-secretase activity in SH-SY5Y cells and in human platelets. J Neurochem. 2009, 108 (2): 341-349.PubMedView ArticleGoogle Scholar
- Grimm MO, Grimm HS, Pätzold AJ, Zinser EG, Halonen R, Duering M, Tschäpe JA, De Strooper B, Müller U, Shen J, Hartmann T: Regulation of cholesterol and sphingomyelin metabolism by amyloid-beta and presenilin. Nat Cell Biol. 2005, 7 (11): 1118-1123.PubMedView ArticleGoogle Scholar
- Shimohama S, Fujimoto S, Matsushima H, Takenawa T, Taniguchi T, Perry G, Whitehouse PJ, Kimura J: Alteration of phospholipase C-delta protein level and specific activity in Alzheimer's disease. J Neurochem. 1995, 64 (6): 2629-2634.PubMedView ArticleGoogle Scholar
- Matsushima H, Shimohama S, Fujimoto S, Takenawa T, Kimura J: Reduction of platelet phospholipase C activity in patients with Alzheimer disease. Alzheimer Dis Assoc Disord. 1995, 9 (4): 213-217.PubMedView ArticleGoogle Scholar
- Matsushima H, Shimohama S, Kawamata J, Fujimoto S, Takenawa T, Kimura J: Reduction of platelet phospholipase C-delta1 activity in Alzheimer's disease associated with a specific apolipoprotein E genotype (epsilon3/epsilon3). Int J Mol Med. 1998, 1 (1): 91-93.PubMedGoogle Scholar
- Balsinde J, Balboa MA, Insel PA, Dennis EA: Regulation and inhibition of phospholipase A2. Annu Rev Pharmacol Toxicol. 1999, 39: 175-189. ReviewPubMedView ArticleGoogle Scholar
- Emmerling MR, Moore CJ, Doyle PD, Carroll RT, Davis RE: Phospholipase A2 activation influences the processing and secretion of the amyloid precursor protein. Biochem Biophys Res Commun. 1993, 197 (1): 292-297.PubMedView ArticleGoogle Scholar
- Lehtonen JY, Holopainen JM, Kinnunen PK: Activation of phospholipase A2 by amyloid beta-peptides in vitro. Biochemistry. 1996, 35 (29): 9407-9414.PubMedView ArticleGoogle Scholar
- Krzystanek E, Krzystanek M, Opala G, Trzeciak HI, Siuda J, Małecki A: Platelet phospholipase A2 activity in patients with Alzheimer's disease, vascular dementia and ischemic stroke. J Neural Transm. 2007, 114 (8): 1033-1039.PubMedView ArticleGoogle Scholar
- Gattaz WF, Forlenza OV, Talib LL, Barbosa NR, Bottino CM: Platelet phospholipase A(2) activity in Alzheimer's disease and mild cognitive impairment. J Neural Transm. 2004, 111 (5): 591-601.PubMedView ArticleGoogle Scholar
- Gattaz WF, Cairns NJ, Levy R, Förstl H, Braus DF, Maras A: Decreased phospholipase A2 activity in the brain and in platelets of patients with Alzheimer's disease. Eur Arch Psychiatry Clin Neurosci. 1996, 246 (3): 129-131.PubMedView ArticleGoogle Scholar
- Ross BM, Moszczynska A, Erlich J, Kish SJ: Phospholipid-metabolizing enzymes in Alzheimer's disease: increased lysophospholipid acyltransferase activity and decreased phospholipase A2 activity. J Neurochem. 1998, 70 (2): 786-793.PubMedView ArticleGoogle Scholar
- Ebinger G, Bruyland M, Martin JJ, Herregodts P, Cras Y, Michotte Y, Gomme L: Distribution of amines and their catabolities in brains from patients with Alzheimer’s disease. J Neurolog Sci. 1987, 77: 267-283.View ArticleGoogle Scholar
- Palmer AM, Francis PT, Benton JS, Sims NR, Mann DM, Neary D, Snowden JS, Bowen DM: Presynaptic serotonergic dysfunction in patients with Alzheimer's disease. J Neurochem. 1987, 48 (1): 8-15.PubMedView ArticleGoogle Scholar
- Tukiainen E, Wikström J, Kilpeläinen H: Uptake of 5-hydroxytryptamine by blood platelets in Huntington's chorea and Alzheimer type of presenile dementia. Med Biol. 1981, 59 (2): 116-120.PubMedGoogle Scholar
- Suranyi-Cadotte BE, Gauthier S, Lafaille F, DeFlores S, Dam TV, Nair NP, Quirion R: Platelet 3 H-imipramine binding distinguishes depression from Alzheimer dementia. Life Sci. 1985, 37 (24): 2305-2311.PubMedView ArticleGoogle Scholar
- Arora RC, Emery OB, Meltzer HY: Serotonin uptake in the blood platelets of Alzheimer's disease patients. Neurology. 1991, 41 (8): 1307-1309.PubMedView ArticleGoogle Scholar
- Sevush S, Jy W, Horstman LL, Mao WW, Kolodny L, Ahn YS: Platelet activation in Alzheimer disease. Arch Neurol. 1998, 55 (4): 530-536.PubMedView ArticleGoogle Scholar
- Ciabattoni G, Porreca E, Di Febbo C, Di Iorio A, Paganelli R, Bucciarelli T, Pescara L, Del Re L, Giusti C, Falco A, Sau A, Patrono C, Davì G: Determinants of platelet activation in Alzheimer's disease. Neurobiol Aging. 2007, 28 (3): 336-342.PubMedView ArticleGoogle Scholar
- Muck-Seler D, Presecki P, Mimica N, Mustapic M, Pivac N, Babic A, Nedic G, Folnegovic-Smalc V: Platelet serotonin concentration and monoamine oxidase type B activity in female patients in early, middle and late phase of Alzheimer's disease. Prog Neuropsychopharmacol Biol Psychiatry. 2009, 33 (7): 1226-1231.PubMedView ArticleGoogle Scholar
- Adolfsson R, Gottfries CG, Oreland L, Wiberg A, Winblad B: Increased activity of brain and platelet monoamine oxidase in dementia of Alzheimer type. Life Sci. 1980, 27 (12): 1029-1034.PubMedView ArticleGoogle Scholar
- Ahlskog JE, Uitti RJ, Tyce GM, O'Brien JF, Petersen RC, Kokmen E: Plasma catechols and monoamine oxidase metabolites in untreated Parkinson's and Alzheimer's diseases. J Neurol Sci. 1996, 136 (1–2): 162-168.PubMedView ArticleGoogle Scholar
- Mimica N, Mück-Seler D, Pivac N, Mustapić M, Dezeljin M, Stipcević T, Presecki P, Radonić E, Folnegović-Smalc V: Platelet serotonin and monoamine oxidase in Alzheimer's disease with psychotic features. Coll Antropol. 2008, 32 (Suppl 1): 119-122.PubMedGoogle Scholar
- Mimica N, Muck-Seler D, Pivac N, Mustapic M, Folnegovic-Smalc V: Platelet serotonin and monoamine oxidase activity in patients with early-onset and late-onset of Alzheimer Disease. Period Biol. 2005, 107: 211-215.Google Scholar
- Bermejo P, Martín-Aragón S, Benedí J, Susín C, Felici E, Gil P, Ribera JM, Villar AM: Differences of peripheral inflammatory markers between mild cognitive impairment and Alzheimer's disease. Immunol Lett. 2008, 117 (2): 198-202.PubMedView ArticleGoogle Scholar
- Vignini A, Nanetti L, Moroni C, Tanase L, Bartolini M, Luzzi S, Provinciali L, Mazzanti L: Modifications of platelet from Alzheimer disease patients: a possible relation between membrane properties and NO metabolites. Neurobiol Aging. 2007, 28 (7): 987-994.PubMedView ArticleGoogle Scholar
- Kawamoto EM, Munhoz CD, Glezer I, Bahia VS, Caramelli P, Nitrini R, Gorjão R, Curi R, Scavone C, Marcourakis T: Oxidative state in platelets and erythrocytes in aging and Alzheimer's disease. Neurobiol Aging. 2005, 26 (6): 857-864.PubMedView ArticleGoogle Scholar
- Yu J, Jia JP: Platelet function in patients with Alzheimer disease: analysis of 40 cases. Zhonghua Yi Xue Za Zhi. 2009, 89 (3): 183-186.PubMedGoogle Scholar
- Rosenberg RN, Baskin F, Fosmire JA, Risser R, Adams P, Svetlik D, Honig LS, Cullum CM, Weiner MF: Altered amyloid protein processing in platelets of patients with Alzheimer disease. Arch Neurol. 1997, 54 (2): 139-144.PubMedView ArticleGoogle Scholar
- Baskin F, Rosenberg RN, Iyer L, Hynan L, Cullum CM: Platelet APP isoform ratios correlate with declining cognition in AD. Neurology. 2000, 54 (10): 1907-1909.PubMedView ArticleGoogle Scholar
- Liu HC, Wang HC, Ko SY, Wang PN, Chi CW, Hong CJ, Lin KN, Liu TY: Correlation between platelet amyloid precursor protein isoform ratio and cognition in Alzheimer's disease. J Alzheimers Dis. 2007, 11 (1): 77-84.PubMedGoogle Scholar
- Di Luca M, Pastorino L, Cattabeni F, Zanardi R, Scarone S, Racagni G, Smeraldi E, Perez J: Abnormal pattern of platelet APP isoforms in Alzheimer disease and Down syndrome. Arch Neurol. 1996, 53 (11): 1162-1166.PubMedView ArticleGoogle Scholar
- Di Luca M, Pastorino L, Bianchetti A, Perez J, Vignolo LA, Lenzi GL, Trabucchi M, Cattabeni F, Padovani A: Differential level of platelet amyloid beta precursor protein isoforms: an early marker for Alzheimer disease. Arch Neurol. 1998, 55 (9): 1195-1200.PubMedView ArticleGoogle Scholar
- Pastorino L, Colciaghi F, Marcon G, Borroni B, Cottini E, Cattabeni F, Padovani A, Di Luca M: Presenilin 2 mutation does not influence expression and concentration of APP forms in human platelets. Mol Med. 2000, 6 (10): 816-824.PubMed CentralPubMedGoogle Scholar
- Padovani A, Borroni B, Colciaghi F, Pettenati C, Cottini E, Agosti C, Lenzi GL, Caltagirone C, Trabucchi M, Cattabeni F, Di Luca M: Abnormalities in the pattern of platelet amyloid precursor protein forms in patients with mild cognitive impairment and Alzheimer disease. Arch Neurol. 2002, 59 (1): 71-75.PubMedView ArticleGoogle Scholar
- Borroni B, Colciaghi F, Caltagirone C, Rozzini L, Broglio L, Cattabeni F, Di Luca M, Padovani A: Platelet amyloid precursor protein abnormalities in mild cognitive impairment predict conversion to dementia of Alzheimer type: a 2-year follow-up study. Arch Neurol. 2003, 60 (12): 1740-1744.PubMedView ArticleGoogle Scholar
- Vignini A, Sartini D, Nanetti L, Luzzi S, Provinciali L, Mazzanti L, Emanuelli M: Platelet amyloid precursor protein isoform expression in Alzheimer’s disease: evidence for peripheral marker. Int J Immunopathol Pharmacol. 2011, 24 (2): 529-534.PubMedGoogle Scholar
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