(A) CD38 activity in liver, adipose tissue, spleen and skeletal muscle of aging mice (n=6 animals for each age, **p<0.01 versus 5 month old mice).
(B) CD38 activity in liver of 1 year old WT and CD38 KO litter mate mice (*p<0.05).
(C) Total liver NAD+ and NADH levels in WT and CD38KO mice during aging measured by mass spectroscopy (n=4 mice for each age, *p<0.05, **p<0.01 versus 5 month old mice).
(D) Total liver NAD+ and NADH levels in WT and CD38KO mice during aging measured by cycling assay (n=14 animals for each age, *p<0.05, **p<0.01 versus 5 month old mice).
(E) NAD+ levels in adipose tissue, spleen, and skeletal muscle of WT and CD38KO mice during aging (n=4 animals for each age, *p<0.05, **p<0.01 versus 5 month old mice).
All values are mean ± SEM.