Figure 12. The effects of increasing concentrations of rotenone on the activation of p38 MAPK phosphorylation in young (4-6 mos), middle aged (10-12 mos) and old (21-24 mos). The bar graphs and western blot analyses below each bar graph show the pool levels of P-Thr180/P-Tyr182 p38 MAPK in (A) young (4-6 mos); (B) middle aged (10-12 mos) and (C) old (21-24 mos) wild-type and dwarf fibroblasts after treatment with increasing concentrations of ROT for 30 minutes. n=3, *p<0.05 between wild-type vs. dwarf.