目的 ·初步探索表没食子儿茶素没食子酸酯（ epigallocatechin-3-gallate，EGCG）对 3T3-L1脂肪细胞氧化应激和炎症水平的影响，为 EGCG防治肥胖及其相关慢性病提供理论依据。方法 ·采用体外细胞培养法，将 3T3-L1前脂肪细胞诱导分化为成熟 3T3L1脂肪细胞。实验分组为空白对照组， 1 μg/mL、10 μg/mL、50 μg/mL EGCG组，干预 24 h，检测细胞内氧化应激指标谷胱甘肽（glutathione，GSH）、超氧化物歧化酶（ superoxide dismutase，SOD）、丙二醛（ malondialdehyde，MDA）含量；采用 ELISA法、实时荧光定量 PCR法分别检测炎症指标白细胞介素 -6（interleukin-6，IL-6）、肿瘤坏死因子 -α（tumor necrosis factor-α，TNF-α）、单核细胞趋化蛋白 -1（monocyte chemoattractant protein-1，MCP-1）含量和 mRNA水平，采用实时荧光定量 PCR法检测核因子 E2相关因子 2（nuclear factor E2-related factor 2，Nrf2）、血红素氧合酶 -1（heme oxygenase-1，HO-1）表达量。结果 · EGCG各干预组 3T3-L1脂肪细胞内 GSH、SOD含量均较空白对照组升高（均 P<0.05），MDA含量则均较空白对照组降低（均 P<0.05），并呈剂量依赖性。经 ELISA法检测发现 1 μg/mL、10 μg/mL、50 μg/mL EGCG干预后 3T3-L1脂肪细胞上清液中 IL-6、MCP-1和 TNF-α的含量均较对照组显著下降（均 P<0.05），并呈剂量依赖性；经实时荧光定量 PCR法检测发现不同浓度 EGCG干预 24 h后，3T3-L1脂肪细胞内 IL-6、 MCP-1、TNF-α mRNA表达量均较对照组逐渐下降，呈剂量依赖性；经 10 μg/mL、50 μg/mL EGCG干预 24 h后 Nrf2、HO-1 mRNA表达量均较对照组显著上升（均 P<0.05）。结论 · EGCG可以抑制 3T3-L1脂肪细胞的氧化应激和炎症水平，此作用可能与上调 Nrf2/ HO-1有关。

Objective · To explore the effect of epigallocatechin-3-gallate (EGCG) on oxidative stress and inflammation in 3T3-L1 adipocytes, and provide a theoretical basis for EGCG to prevent obesity and related chronic diseases. Methods · 3T3-L1 preadipocytes were differentiated to mature adipocytesin vitro cell culture. The cells were divided into blank control group, and 1, 10 and 50 μg/mL EGCG groups. After 24 hour treatment, intracellular oxidative stress indicators glutathione (GSH), superoxide dismutase (SOD), and malondialdehyde (MDA) levels in the cells were measured. The levels of inflammatory indexes interleukin-6 (IL-6), tumor necrosis factor-α (TNF-α), and monocyte chemoattractant protein-1 (MCP-1) were testedELISA and realtime PCR, while the of nuclear factor E2-related factor 2 (Nrf2) and heme oxygenase-1 (HO-1) was testedrealtime PCR. Results · Compared with the control group, GSH and SOD levels in 3T3-L1 adipocytes increased in a dose-dependent manner after treatment of EGCG (both P<0.05), while MDA level in 3T3-L1 adipocytes decreased dose-dependently after treatment of EGCG (P<0.05). IL-6, MCP-1 and TNF-α levels in 3T3L1 adipocytes supernatant declined significantly in a dose-dependent manner after treatment of 1, 10 and 50 μg/mL EGCG (all P<0.05). The levels of IL-6, MCP-1 and TNF-α in 3T3-L1 adipocytes were decreased in a dose-dependent manner after 24 h treatment of different concentrations of EGCG. Nrf2 and HO-1 mRNA levels in 3T3-L1 adipocytes increased significantly in a dose-dependent manner after treatment of 10 and 50 μg/mL EGCG (both P<0.05). Conclusion · EGCG plays an antioxidation and anti-inflammatory effects in 3T3-L1 adipocytes, which may be related to up-regulation of Nrf2/HO-1.