Melanin relieves oxidative stress in adipocytes culture in vitro

M. Jarrar, A. E. Shafey, Rabia Essa, Ruksar Damji, A. Rauf, Ielaf Hindi
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引用次数: 1

Abstract

Obesity is one of major health disorders that has become epidemic worldwide. Studies have demonstrated that oxidative stress and inflammation in adipose tissue is involved in obesity linked complications. The ectopic synthesis of melanin in adipocytes of obese patients has been newly discovered. It is hypothesized that there is potential role of melanin and its intermediates to ameliorate oxidative stress in adipose which may prevent the secondary complications to obesity.  This study was done to determine whether melanin interferes with the level of oxidative stress produced in adipocyte cells in culture. Adipocyte cells were cultured in vitro and exposed to high concentration of glucose oxidase to induce oxidative stress, then cells were treated with melanin for different periods. Thereafter the levels of some oxidative stress and inflammatory biomarkers such as glutathione, TNF-alpha, Malondialdehyde (MDA), and protein carbonyl were measured. It was found that when cells were exposed to glucose oxidase the level of oxidative stress increased over time as reflected by the decrease of Glutathione.  Interestingly, when melanin was added the level of oxidative stress decreased over time as reflected by increase in glutathione concentrations. It was also found that TNF-alpha decreased upon treatment by melanin but after 72 hours but not on 24 and 48 hours treatments. However, protein carbonyl and MDA appeared to be less affected by melanin treatments. These results may indicate that melanin is capable of diminishing the effects of oxidative stress on the cells at early stages probably by interfering with lipids peroxidation and production of reactive oxygen species.
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黑色素对体外脂肪细胞氧化应激的缓解作用
肥胖是一种主要的健康疾病,已成为世界性的流行病。研究表明,脂肪组织中的氧化应激和炎症与肥胖相关的并发症有关。肥胖患者脂肪细胞中黑色素异位合成已被新发现。我们推测黑色素及其中间体可能具有改善脂肪氧化应激的潜在作用,从而预防肥胖的继发性并发症。这项研究是为了确定黑色素是否会干扰培养脂肪细胞中产生的氧化应激水平。体外培养脂肪细胞,高浓度葡萄糖氧化酶诱导氧化应激,然后不同时期用黑色素处理。然后测量一些氧化应激和炎症生物标志物的水平,如谷胱甘肽、tnf - α、丙二醛(MDA)和蛋白质羰基。研究发现,当细胞暴露于葡萄糖氧化酶时,氧化应激水平随着时间的推移而增加,这反映在谷胱甘肽的减少上。有趣的是,当加入黑色素时,氧化应激水平随着时间的推移而下降,这反映在谷胱甘肽浓度的增加上。还发现tnf - α在黑色素治疗72小时后下降,但在24小时和48小时后没有下降。然而,蛋白质羰基和MDA似乎受黑色素治疗的影响较小。这些结果可能表明黑色素能够在早期阶段减少氧化应激对细胞的影响,可能是通过干扰脂质过氧化和活性氧的产生。
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