Effect of telmisartan on AMPK-SIRT1 pathway
Since telmisartan increased Sirt1 mRNA levels in the
skeletal muscle of db/db mice, we investigated whether
telmisartan administration could directly affect SIRT1
signals in C2C12 myoblasts. Treatment with telmisartan
increased Sirt1 mRNA in C2C12 cells (Figure 4A).
Treatment of C2C12 cells with telmisartan resulted in
activation of AMPK, by means of phosphorylation, to a
level comparable to that induced by 5-aminoimidazole-
4-carboxamide ribonucleoside (AICAR), an activator of
AMPK (Figure 4B). Treatment of C2C12 cells with telmisartan increased NAD
+
and decreased NADH, resulting in an increase in the NAD
+
/NADH ratio, to a level
comparable to that induced by AICAR (Figure 4C).
Effect of telmisartan on mRNA expression of AMPK/SIRT1
pathway-related molecules in C2C12 myocytes
Treatment with telmisartan increased the mRNA levels
of PGC1, FATP1, ACO and GLUT4, but not of GLUT1,
in C2C12 myocytes (Figure 5)
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