title: Tea polyphenols regulate nicotinamide adenine dinucleotide phosphate oxidase subunit expression and ameliorate angiotensin II-induced hyperpermeability in endothelial cells.
abstract: Out-of-control reactive oxygen species (ROS) signaling is one of the key events in the pathogenesis of endothelial dysfunction and essential hypertension. We observed that tea polyphenols decreased the production of ROS via regulation of the protein expression of nicotinamide adenine dinucleotide phosphate (NADPH) oxidase in bovine carotid artery endothelial cells (BCAECs). Both green tea polyphenols (GTP) and black tea polyphenols (BTP) down-regulated the expression of NADPH oxidase subunits p22phox and p67phox while up-regulating catalase expression (p < 0.05, respectively). Pre-treatment with GTP or BTP for 24 h significantly decreased the superoxide anion level (p < 0.05) and permeable fluorescence intensities in Ang II-stimulated BCAECs. A decrease in cell permeability was also observed by pre-treatment with diphenylene iodonium chloride (DPI) or vitamin E (p < 0.05, respectively). The result demonstrates that tea polyphenols alleviate angiotensin (Ang) II-induced hyperpermeability mainly by decreasing ROS production. Our results suggest that tea polyphenols regulate ROS-related protein expression and may be beneficial in preventing endothelial cell dysfunction and development of cardiovascular diseases, including hypertension.
authors: School of Human Environmental Science, Mukogawa Women's University, Nishinomiya, Japan.
authors: Chen-Jiang
authors: CJ
authors: Ying
authors: Jin-Wen
authors: JW
authors: Xu
authors: Katsumi
authors: K
authors: Ikeda
authors: Kyoko
authors: K
authors: Takahashi
authors: Yasuo
authors: Y
authors: Nara
authors: Yukio
authors: Y
authors: Yamori
mesh_terms: D000804:Angiotensin II / Q000494:pharmacology; D000818:Animals; D002199:Capillary Permeability / Q000187:drug effects; D002339:Carotid Arteries / Q000166:cytology; D002417:Cattle; D002478:Cells, Cultured; D004730:Endothelium, Vascular / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D005419:Flavonoids / Q000494:pharmacology*; D026901:Membrane Transport Proteins / Q000378:metabolism*; D009252:NADPH Dehydrogenase / Q000378:metabolism*; D019255:NADPH Oxidases / Q000378:metabolism*; D010636:Phenols / Q000494:pharmacology*; D010750:Phosphoproteins / Q000378:metabolism*; D059808:Polyphenols; D017382:Reactive Oxygen Species / Q000378:metabolism; D013481:Superoxides / Q000378:metabolism; D013662:Tea; D014662:Vasoconstrictor Agents / Q000494:pharmacology
chemical_list: D005419:Flavonoids; D026901:Membrane Transport Proteins; D010636:Phenols; D010750:Phosphoproteins; D059808:Polyphenols; D017382:Reactive Oxygen Species; D013662:Tea; D014662:Vasoconstrictor Agents; C079789:neutrophil cytosol factor 67K; D013481:Superoxides; D000804:Angiotensin II; D019255:NADPH Oxidases; C086986:CYBA protein, human; D009252:NADPH Dehydrogenase