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首页> 外文期刊>Journal of Agricultural and Food Chemistry >Tangeretin Reduces Ultraviolet B (UVB)-lnduced Cyclooxygenase-2 Expression in Mouse Epidermal Cells by Blocking Mitogen-Activated Protein Kinase (MAPK) Activation and Reactive Oxygen Species (ROS) Generation
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Tangeretin Reduces Ultraviolet B (UVB)-lnduced Cyclooxygenase-2 Expression in Mouse Epidermal Cells by Blocking Mitogen-Activated Protein Kinase (MAPK) Activation and Reactive Oxygen Species (ROS) Generation

机译:橘皮素通过阻断丝裂原激活的蛋白激酶(MAPK)激活和活性氧(ROS)的生成减少小鼠表皮细胞中紫外线B(UVB)诱导的环氧合酶-2的表达。

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摘要

The present study examined the effects of tangeretin, a polymethoxylated flavonone present in citrus fruits, on ultraviolet B (UVB)-induced cyclooxygenase-2 (COX-2) expression in JB6 P+ mouse skin epidermal cells. Tangeretin suppressed UVB-induced COX-2 expression and transactivation of nuclear factor-kB and activator protein-1 in JB6 P+ cells. Moreover, tangeretin blocked UVB-induced phosphorylation of Akt and mitogen-activated protein kinases (MAPKs), including extracellular signal-regulated protein kinase, c-Jun N-terminal kinase, and p38, and attenuated the phosphorylation of MAPK kinases 1/2, 3/6, and 4. Tangeretin also limited the endogenous generation of reactive oxygen species (ROS), thereby protecting the cells against oxidative stress. However, tangeretin did not scavenge the stable 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical and influence the nicotinamide adenine dinucleotide phosphate oxidase activity. These results suggest that the anti-inflammatory effects of tangeretin stem from its modulation of cell signaling and suppression of intracellular ROS generation. Tangeretin may have a potent chemopreventive effect in skin cancer.
机译:本研究检查了橘皮中的柑橘类水果中存在的多甲氧基化黄酮酮对JB6 P +小鼠皮肤表皮细胞中紫外线B(UVB)诱导的环氧合酶2(COX-2)表达的影响。橘皮素可抑制JB6 P +细胞中UVB诱导的COX-2表达以及核因子-kB和激活蛋白1的反式激活。此外,橘皮素阻断了UVB诱导的Akt和丝裂原激活的蛋白激酶(MAPK)(包括细胞外信号调节蛋白激酶,c-Jun N端激酶和p38)的磷酸化,并减弱了MAPK激酶1/2的磷酸化, 3/6和4。橘子还限制了活性氧(ROS)的内源性生成,从而保护细胞免受氧化应激。但是,橘皮苷不能清除稳定的1,1-二苯基-2-吡啶并肼基(DPPH)自由基,并不会影响烟酰胺腺嘌呤二核苷酸磷酸氧化酶的活性。这些结果表明,橘皮苷的抗炎作用源于其对细胞信号传导的调节和细胞内ROS生成的抑制。橘皮素可能在皮肤癌中具有有效的化学预防作用。

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