Tissue & cell · 2025
Black tea extract exerts a protective effect on diethylnitrosamine-induced hepatic precancerous lesions through the Nrf2 signaling pathway.
СтатьяНазвание и аннотация: Перевод в очереди
Обработка статьи · этапы, ошибки и управление
Загрузка состояния…
Ошибки и ограничения
История · было → стало
Состояние обновляется каждые 5 секунд, пока блок открыт. Процент показывается только там, где известен объём работы. Пауза останавливает продолжение этапа; текущий запрос к источнику может завершиться.
Wang Xiu, Hu Ying-Hao, Luo Jia-Jia, Wang Yan
Аннотация
OBJECTIVE: To investigate the protective effect and mechanism of black tea (BT) extract on diethylnitrosamine (DEN)-induced liver precancerous lesions in rats.
METHODS: Fifty male Sprague-Dawley (SD) rats were randomly assigned to five groups: normal control, DEN model, and three black tea extract groups (low, medium, and high dose: DEN+BT-L, DEN+BT-M, DEN+BT-H). The model and treatment groups received DEN (50 mg/kg, i.p.) for 14 weeks, and black tea extract (25, 50, or 100 mg/kg) was administered via gavage. Liver histopathology was evaluated by hematoxylin-eosin (HE) and Masson staining. Serum levels of alanine aminotransferase (ALT), aspartate aminotransferase (AST), alkaline phosphatase (ALP), alpha-fetoprotein (AFP), interleukin-6 (IL-6), and tumor necrosis factor-alpha (TNF-α) were assessed. Hepatic oxidative stress markers-reactive oxygen species (ROS), superoxide dismutase (SOD), glutathione (GSH), and malondialdehyde (MDA)-were measured. Expression of nuclear factor erythroid 2-related factor 2 (Nrf2), heme oxygenase-1 (HO-1), NAD(P)H quinone dehydrogenase 1 (NQO1), signal transducer and activator of transcription 3 (STAT3), phosphorylated STAT3 (p-STAT3), nuclear factor-kappa B (p65), and phosphorylated p65 (p-p65) was evaluated by Western blot.
RESULTS: Black tea extract alleviated DEN-induced hepatocyte damage, fibrosis, and inflammation. It reduced serum ALT, AST, ALP, AFP, IL-6, and TNF-α levels, decreased ROS and MDA, and increased SOD and GSH levels in a dose-dependent manner (P < 0.05). Nrf2 and HO-1 protein levels were upregulated, while STAT3, p-STAT3, p65, and p-p65 expressions were downregulated. NQO1 expression showed a decreasing trend.
CONCLUSIONS: Black tea extract protects against DEN-induced liver precancerous changes by enhancing antioxidant capacity via the Nrf2/HO-1 pathway and inhibiting the NF-κB/STAT3 axis, suggesting its potential in preventing liver carcinogenesis.
METHODS: Fifty male Sprague-Dawley (SD) rats were randomly assigned to five groups: normal control, DEN model, and three black tea extract groups (low, medium, and high dose: DEN+BT-L, DEN+BT-M, DEN+BT-H). The model and treatment groups received DEN (50 mg/kg, i.p.) for 14 weeks, and black tea extract (25, 50, or 100 mg/kg) was administered via gavage. Liver histopathology was evaluated by hematoxylin-eosin (HE) and Masson staining. Serum levels of alanine aminotransferase (ALT), aspartate aminotransferase (AST), alkaline phosphatase (ALP), alpha-fetoprotein (AFP), interleukin-6 (IL-6), and tumor necrosis factor-alpha (TNF-α) were assessed. Hepatic oxidative stress markers-reactive oxygen species (ROS), superoxide dismutase (SOD), glutathione (GSH), and malondialdehyde (MDA)-were measured. Expression of nuclear factor erythroid 2-related factor 2 (Nrf2), heme oxygenase-1 (HO-1), NAD(P)H quinone dehydrogenase 1 (NQO1), signal transducer and activator of transcription 3 (STAT3), phosphorylated STAT3 (p-STAT3), nuclear factor-kappa B (p65), and phosphorylated p65 (p-p65) was evaluated by Western blot.
RESULTS: Black tea extract alleviated DEN-induced hepatocyte damage, fibrosis, and inflammation. It reduced serum ALT, AST, ALP, AFP, IL-6, and TNF-α levels, decreased ROS and MDA, and increased SOD and GSH levels in a dose-dependent manner (P < 0.05). Nrf2 and HO-1 protein levels were upregulated, while STAT3, p-STAT3, p65, and p-p65 expressions were downregulated. NQO1 expression showed a decreasing trend.
CONCLUSIONS: Black tea extract protects against DEN-induced liver precancerous changes by enhancing antioxidant capacity via the Nrf2/HO-1 pathway and inhibiting the NF-κB/STAT3 axis, suggesting its potential in preventing liver carcinogenesis.