首页> 外文期刊>Journal of Nutritional Science and Vitaminology >Gallic acid, an antioxidant, exhibits antiapoptotic potential in normal human lymphocytes: A Bcl-2 independent mechanism.
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Gallic acid, an antioxidant, exhibits antiapoptotic potential in normal human lymphocytes: A Bcl-2 independent mechanism.

机译:没食子酸,一种抗氧化剂,在正常人淋巴细胞中具有抗凋亡的潜力:一种Bcl-2独立机制。

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摘要

Oxidative stress, produced as a consequence of normal metabolism or induced by extraneous stimuli, has been proved to be a mediator of cell death. The inherent antioxidant defense system and exogenous antioxidants can help the body to combat this oxidative stress-induced cell death. In this study, we explored the antiapoptotic potential of gallic acid, a dietary phenolic having antioxidative and anticarcinogenic properties, in normal human peripheral blood lymphocytes (PBLs). Incubation of PBLs with 100 microM H2O2 for 1.5-2.0 h induced phosphatidyl serine externalisation, lipid peroxidation and high molecular weight DNA fragmentation. Pretreatment of lymphocytes with gallic acid for 18 h could effectively inhibit lipid peroxidation and apoptosis induced by oxidative stress. Treatment of PBLs with gallic acid failed to induce any change in the expression of Bcl-2, an antiapoptotic protein. It seems that the protection provided by gallic acid was due to its direct action in the scavenging of free radicals as it was found to be a stronger antiradical than trolox, a water- soluble analogue of vitamin E.
机译:氧化应激是正常代谢的结果,或由外界刺激引起,已被证明是细胞死亡的媒介。固有的抗氧化剂防御系统和外源性抗氧化剂可以帮助人体抵抗氧化应激诱导的细胞死亡。在这项研究中,我们探讨了没食子酸-具有抗氧化和抗致癌特性的饮食酚类-在正常人外周血淋巴细胞(PBL)中的抗凋亡潜力。将PBL与100 microM H2O2孵育1.5-2.0 h可诱导磷脂酰丝氨酸外在化,脂质过氧化和高分子量DNA片段化。没食子酸预处理淋巴细胞18 h可有效抑制氧化应激诱导的脂质过氧化和细胞凋亡。用没食子酸处理PBLs不能诱导抗凋亡蛋白Bcl-2的表达发生任何变化。没食子酸提供的保护作用似乎是由于其在清除自由基方面的直接作用,因为它被发现比维生素E的水溶性类似物trolox具有更强的抗自由基能力。

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