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首页> 外文期刊>Cellular Physiology and Biochemistry >Differences in Mitochondrial Function and Antioxidant Systems between Regions of Human Glioma
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Differences in Mitochondrial Function and Antioxidant Systems between Regions of Human Glioma

机译:人类胶质瘤区域之间的线粒体功能和抗氧化系统的差异

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Metabolic features and oxidative stress have been extensively studied in cancer cells. However, comparative studies between cancer cell populations that coexist in human neoplastic tissue are not frequently available. The aim of the present study was to characterize markers of oxidative status and mitochondrial function in center vs. periphery of human fresh glioma samples; therefore, antioxidant systems, oxidative stress and mitochondrial parameters were assessed in gross total resections of gliomas. Mitochondrial protein and mitochondrial DNA content, enzymatic activities of mitochondrial oxidative and phosphorylative system, antioxidant mechanisms, mitochondrial H2O2 production, oxygen consumption and cellular oxidative damage were measured in human gliomas. Concentric regions of human glioma tissue showed similar mitochondrial structural markers; conversely, the functionality of their isolated mitochondria was significantly different. In this way, the tumor periphery exhibited higher respiratory rate and fewer antioxidant systems than tumor center. Our results have expanded previous investigations, which report the presence of cell populations with different oxidative susceptibility in human brain tumor samples. This is, to our knowledge, the first study to investigate metabolic differences in concentric regions of gross total resections of glioma. Interestingly, the cancer cell population that exhibits an increased antioxidant capacity within the tumor mass might be responsible for tumor resistance to chemotherapy and radiotherapy.
机译:在癌细胞中已广泛研究了代谢特征和氧化应激。然而,在人类肿瘤组织中共存的癌细胞群体之间的比较研究并不经常进行。本研究的目的是鉴定人新鲜神经胶质瘤样品中心与周边的氧化状态和线粒体功能的标志物。因此,在胶质瘤的总切除中评估了抗氧化系统,氧化应激和线粒体参数。测量人胶质瘤中的线粒体蛋白和线粒体DNA含量,线粒体氧化和磷酸化系统的酶活性,抗氧化机制,线粒体H2O2的产生,耗氧量和细胞氧化损伤。人脑胶质瘤组织的同心区域显示出相似的线粒体结构标记;相反,它们孤立的线粒体的功能却大不相同。以这种方式,肿瘤外围表现出比肿瘤中心更高的呼吸频率和更少的抗氧化系统。我们的结果扩大了先前的研究范围,该研究报告了人类脑肿瘤样品中存在具有不同氧化敏感性的细胞群体。据我们所知,这是第一个研究神经胶质瘤全切除的同心区域代谢差异的研究。有趣的是,在肿瘤块内表现出增加的抗氧化能力的癌细胞群可能是肿瘤对化学疗法和放射疗法的抵抗力的原因。

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