title: Effects of green tea tannin on cisplatin-induced nephropathy in LLC-PK1 cells and rats.
abstract: A study was conducted to clarify whether green tea tannin ameliorated cisplatin-induced renal injury in terms of lactate dehydrogenase and malondialdehyde leakage from a renal epithelial cell line, swine-derived LLC-PK1 cells in culture. Green tea tannin was shown to suppress the cytotoxicity of cisplatin, the suppressive effect increasing with the dose of green tea tannin. The effect of cisplatin was then investigated in rats given green tea tannin for 40 days before cisplatin administration and in control rats given no green tea tannin. In control rats, blood, urinary and renal parameters and the activities of antioxidative enzymes in renal tissue deviated from the normal range, indicating dysfunction of the kidneys. In contrast, rats given green tea tannin showed decreased blood levels of urea nitrogen and creatinine, and decreased urinary levels of protein and glucose, reflecting less damage to the kidney. In this group, the activity of catalase in the renal tissue was increased, while the level of malondialdehyde was decreased, suggesting the involvement of radicals in the normalizing of kidney function. Based on the evidence available it appeared that green tea tannin eliminated oxidative stress and was beneficial to renal function.
authors.affiliation: Research Institute for Wakan-Yaku, Toyama Medical and Pharmaceutical University, Sugitani, Japan. yokozawa@ms.toyama-mpu.ac.jp
authors.forename: T
authors.initials: T
authors.lastname: Yokozawa
authors.forename: T
authors.initials: T
authors.lastname: Nakagawa
authors.forename: K I
authors.initials: KI
authors.lastname: Lee
authors.forename: E J
authors.initials: EJ
authors.lastname: Cho
authors.forename: K
authors.initials: K
authors.lastname: Terasawa
authors.forename: S
authors.initials: S
authors.lastname: Takeuchi
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000037:antagonists & inhibitors* / Q000633:toxicity; D002374:Catalase / Q000378:metabolism; D002470:Cell Survival / Q000187:drug effects; D002945:Cisplatin / Q000037:antagonists & inhibitors* / Q000633:toxicity; D003470:Culture Media; D004847:Epithelial Cells / Q000187:drug effects; D016166:Free Radical Scavengers / Q000378:metabolism; D005979:Glutathione Peroxidase / Q000378:metabolism; D047348:Hydrolyzable Tannins / Q000494:pharmacology*; D007668:Kidney / Q000187:drug effects / Q000201:enzymology; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D018374:LLC-PK1 Cells; D008297:Male; D008315:Malondialdehyde / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D013482:Superoxide Dismutase / Q000378:metabolism; D013552:Swine; D013662:Tea / Q000737:chemistry*
chemical_list: D000970:Antineoplastic Agents; D003470:Culture Media; D016166:Free Radical Scavengers; D047348:Hydrolyzable Tannins; D013662:Tea; D008315:Malondialdehyde; D007770:L-Lactate Dehydrogenase; D002374:Catalase; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase; D002945:Cisplatin