Fig. 2

Expression of cellular protective proteins in non-stimulated NK cells of the oldest seniors (aged over 85), the old aged under 85 and the young. Data are presented as means ± SEM and concern expression of the studied proteins in NK cells demonstrated as percentages of cells with expression of a particular protein (%) or mean fluorescence intensity (MFI). The same ^#,*,^ symbols over bars denote statistically significant differences between NK cells of different age groups. a. Expression of SIRT1 (%): ^# p = 0.0001; * p = 0.000002. b. Expression of SIRT1 (MFI): ^ p = 0.022; ^# p = 0.004; * p = 0.000001. c. Expression of SOD2 (%): ^# p = 0.000009; * p = 0.006. d. Expression of SOD2 (MFI): * p = 0.0003. e. Expression of intracellular HSP70 (%): ^# p = 0.0002; * p = 0.000005. f. Expression of intracellular HSP70 (MFI): ^# p = 0.0023; * p = 0.000002. g. Expression of surface HSP70 (%): * p = 0.02. h. Expression of surface HSP70 (MFI): * p = 0.045