Resveratrol is a natural non-flavonoid
polyphenol found in red wine, which has numerous pharmacological properties including
anti-stress
and antidepressant-like abilities. However, whether the antidepressant-
and anxiolytic-like effects of resveratrol are related to the
inhibition of
phosphodiesterase 4
(PDE4) and its subtypes remains unknown. The same holds true for the
subsequent cAMP-dependent pathway. The first set of studies investigated
whether resveratrol exhibited
neuroprotective effects against corticosterone-induced cell lesion as well as its underlying mechanism. We found that 100 μM
corticosterone
induced PDE2A, PDE3B, PDE4A, PDE4D, PDE10 and PDE11 expression in
HT-22 cells, which results in significant cell lesion. However,
treatment with resveratrol increased
cell viability
in a dose- and time-dependent manner. These effects seem related to the
inhibition of PDE4D, as evidenced by resveratrol dose-dependently
decreasing PDE4D expression. In addition, the PKA inhibitor
H89
reversed resveratrol's effects on cell viability. Resveratrol prevented
corticosterone-induced reduction in cAMP, pVASP(s157), pCREB, and
BDNF levels, indicating that
cAMP signaling is involved in resveratrol-induced neuroprotective effects. Not to mention, PDE4D knockdown by PDE4D
siRNA
potentiated the effect of low dose of resveratrol on cAMP, pVASP,
pCREB, and BDNF expression, while PDE4D overexpression reversed the
effect of high dose of resveratrol on the expression of the above
proteins. Finally, the subsequent
in vivo data supports the
in vitro
findings, suggesting that resveratrol-induced antidepressant- and
anxiolytic-like effects are mediated by PDE4D. Overall, these findings
support the hypothesis that PDE4D-mediated cAMP signaling plays an
important role in resveratrol's protective effects on stress-induced
depression- and anxiety-like behavior.
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