It has been reported that resveratrol (trans-3,5,4′-trihydroxy- stilbene) from Vitis plants has various cardioprotective effects. Vitis plants also include various resveratrol tetramers. The aim of our study is to clarify the pharmacological properties of resveratrol tetramers. We isolated two resveratrol tetramers as major products of Vitis plants. One is vitisin A, a complex of two resveratrol dimers, (+)-ε-viniferin and ampelopsin B, and the other is hopeaphenol, composed of 2 mol ampelopsin B. Vitisin A (30-300 nM) unexpectedly dose-dependently facilitated swelling and depolarization of mitochondria and cytochrome c release from mitochondria, which are indices of cardiomyocyte apoptosis. Furthermore, vitisin A induced apoptosis in the primary culture of adult rat ventricular myocytes. On the other hand, hopeaphenol (1-10 μM) dose-dependently inhibited Ca2+ (30 μM)-induced mitochondrial depolarization and cytochrome c release from mitochondria but had not affected mitochondrial swelling. Moreover, hopeaphenol inhibited vitisin A-induced apoptosis. In structural and functional studies, we further confirmed that vitisin B, one of the resveratrol tetramers having (+)-ε-viniferin unit, induces mitochondrial swelling and cytochrome c release from mitochondria like vitisin A and that vitisifuran A, one of the resveratrol tetramers having the ampe-lopsin B unit, inhibits Ca2+-induced cytochrome c release from mitochondria like hopeaphenol. These results show that res-veratrol tetramers have at least two opposite effects on cardio-myocytes; the one having the (+)-ε-viniferin unit induces car-diomyocyte apoptosis, and the other having ampelopsin B but not (+)-ε-viniferin unit inhibits it.
|Number of pages||9|
|Journal||Journal of Pharmacology and Experimental Therapeutics|
|Publication status||Published - 2009 Jan 1|
ASJC Scopus subject areas
- Molecular Medicine