title: Piceatannol, a stilbene phytochemical, inhibits mitochondrial F0F1-ATPase activity by targeting the F1 complex.
abstract: Piceatannol is a stilbene phytochemical from the seeds of Euphorbia lagascae, previously identified as an antileukemic principle. Piceatannol is considered an inhibitor of several tyrosine kinases. We recently reported that resveratrol, another stilbene phytoalexin from grape seeds, was an inhibitor of ATP synthase. Here, we demonstrated that piceatannol potently inhibited the rat brain mitochondrial F0F1-ATPase activity in both solubilized and submitochondrial preparations (IC50 of 8-9 microM), while having relatively small effect on the Na(+), K(+)-ATPase activity of porcine cerebral cortex (no effect up to 7 microM). Piceatannol inhibited the ATPase activity of the purified rat liver F1 with IC50 of about 4 microM, while resveratrol was slightly less active (IC50 of about 14 microM). Our results indicate that piceatannol and resveratrol inhibit the F-type ATPase by targeting the F1 sector, which is located to the inner membrane of mitochondria and plasma membrane of normal endothelial cells and several cancer cell lines. This mechanism could potentially contribute to the multiple effects of these chemopreventive phytochemicals.
authors.affiliation: Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, 524 Burrill Hall, Urbana, Illinois, 61801, USA.
authors.forename: J
authors.initials: J
authors.lastname: Zheng
authors.forename: V D
authors.initials: VD
authors.lastname: Ramirez
mesh_terms: D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000494:pharmacology; D001921:Brain / Q000187:drug effects / Q000201:enzymology; D002540:Cerebral Cortex / Q000187:drug effects / Q000201:enzymology; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D005260:Female; D066298:In Vitro Techniques; D008928:Mitochondria / Q000187:drug effects / Q000201:enzymology; D008930:Mitochondria, Liver / Q000187:drug effects / Q000201:enzymology; D006180:Proton-Translocating ATPases / Q000037:antagonists & inhibitors*; D051381:Rats; D017207:Rats, Sprague-Dawley; D000077185:Resveratrol; D000254:Sodium-Potassium-Exchanging ATPase / Q000037:antagonists & inhibitors; D013267:Stilbenes / Q000494:pharmacology*; D013552:Swine
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D004791:Enzyme Inhibitors; D013267:Stilbenes; C041525:3,3',4,5'-tetrahydroxystilbene; D006180:Proton-Translocating ATPases; D000254:Sodium-Potassium-Exchanging ATPase; D000077185:Resveratrol