《生命科学》 2011, 23(10): 1027-1033
摘 要:摘 要:近年新研究发现COX-2 可使用比COX-1 更广泛的底物。比如,除了标准的花生四烯酸外,COX-2 也能将二十二碳六烯酸(DHA) 和二十碳五烯酸 (EPA) 等转换成前列腺素衍生物。这些前列腺素衍生物可进一步转化成促进消炎、 抗氧化的亲电羰基衍生物(EFOX) 分子, 并且可以从Keap1 解离转录因子Nrf2,继而可以激活多种与抗氧化相关的含ARE 应答元件的基因, 如血红素氧化酶-1、谷胱甘肽还原酶等。COX-2 的这些新功能有可能帮助更好地理解Nrf2/ARE 信号通路及其抗炎、抗氧化、诱导肿瘤细胞凋亡等机理。对外源性抗氧化剂触发体内的抗氧化基因及抗炎信号的可能性,以及与饮食相关的抗衰老机理进行
探讨。
关键词:COX-2 ;Nrf2/ARE ;抗炎;抗氧化;多糖
中图分类号:Q559 文献标志码:A
Abstract: Abstract: Recent studies have revealed that multiple substrates of the cyclooxygenase (COX)-2 enzyme, such as docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA), in addition to the standard substrate, arachidonic
acid(AA), and COX-2 dependent electrophilic oxo-derivatives (EFOX) release Nrf2 by changing Keap1 conformation, subsequently Nrf2 activates the antioxidative response elements (ARE), such as heme oxygenase-1, glutathione reductase, etc. These findings suggest the involvement of COX-2 and Nrf2/ARE in anti-inflammatory and anti-oxidative mechanisms. In this study, we discussed the correlations present between exogenous and endogenous factors in anti-oxidation and anti-inflammation, and propose a putative mechanism of anti-ageing involving commonly found dietary-herbal compounds.
Key words: COX-2; Nrf2/ARE; anti-inflammation; anti-oxidation; polysaccharides