Trans-resveratrol inhibits phosphorylation of Smad2/3 and represses FSHβ gene expression by a SirT1-independent pathway in LβT2 gonadotrope cells ★

Resveratrol (trans-3,5,4′-trihydroxystilbene), a polyphenol found in red wine, has multiple beneficial activities that are similar to caloric restriction. In this study, we analyzed the effect of resveratrol on the gonadotropin genes, follicle-stimulating hormone (FSHβ) and luteinizing hormone (LHβ) in LβT2 immortalized mouse gonadotrope cells. Resveratrol specifically inhibited activin-induced FSHβ mRNA and protein expression, and reduced activin-stimulated Smad2/3 phosphorylation. Knockdown of SirT1 gene expression or SirT1 inhibition did not block repression of FSHβ expression or suppression of Smad2/3 phosphorylation, but did increase p53 acetylation. Taken together, our results suggest that resveratrol down-regulates Smad2/3 phosphorylation and suppresses FSHβ expression via a SirT1-independent pathway.

► Resveratrol reduces Smad2/3 phosphorylation.
► Resveratrol represses FSH expression and secretion.
► SirT1 not required for this repression.