AKT1 and cardiac hypertrophy: Moreover, hearts of LepRS1138 mice exhibited elevated levels of phosphorylated Jak2 (P < 0.001 vs. WT; Figure 3A), Src kinase (P < 0.05 vs. WT, WT + HFD and LepRdb/db; Figure 3B), Akt (P < 0.001 vs. LepRdb/db; Figure 3C), PKC (P < 0.05 vs. WT and LepRdb/db, P < 0.01 vs. WT + HFD; Figure 3D) and p38 MAPK (P < 0.01 vs. LepRdb/db; Figure 3E), suggesting that an intact, Tyr1138-independent LepR activation in the presence of elevated leptin levels may have contributed to the pronounced cardiac hypertrophy present in these mice.