摘要
缺氧是组织供氧量减少至生理需求水平以下的一种状态。然而,生理性缺氧发生在胚胎发育早期,器官成熟期,许多细胞如骨髓干细胞均处于缺氧状态。因此,缺氧会让机体产生某些特定的变化,最近研究强调生理性癌细胞与缺氧的关系。细胞对缺氧的反应取决于缺氧诱导因子(HIFs),其在低氧条件很稳定。在缺氧环境中,各种各样的缺氧诱导因子能形成二聚物,这些二聚物具有恒定的子单位并与基因组中缺氧反应因子联合,充当转录因子,诱导各种各样的基因表达。有代表性地,缺氧诱导因子通路被用于诱导加强血管内皮生长因子表达,这可能是血管生成的原因,因此,可在缺氧部位再氧合。胚胎干细胞可抑制严重的缺氧环境,从而影响糖代谢,然而,分化细胞从代谢需求中可进行 更有效的需氧呼吸。因此,低氧含量被报道可加强诱导多功能干细胞的生殖。缺氧诱导因子也可用于诱导加强多能性基因表达,包括Oct4(八聚物-转录因子4),Nanog 和Wnt。因此,细胞代谢可能在干性维持、细胞增殖和重组中发挥作用。此外,在癌细胞的缺氧微环境中,新陈代谢从氧化磷酸化变为无氧酵解,这个过程为竞争效应,涉及癌症研究进展过程中。
关键词: 癌症,发展,DNA修复,糖酵解,缺氧诱导因子,缺氧,新陈代谢,重组,活性氧,多能性
Current Molecular Medicine
Title:Cell Metabolism Under Microenvironmental Low Oxygen Tension Levels in Stemness, Proliferation and Pluripotency
Volume: 15 Issue: 4
Author(s): M.P. De Miguel, Y. Alcaina, D. Sainz de la Maza and P. Lopez-Iglesias
Affiliation:
关键词: 癌症,发展,DNA修复,糖酵解,缺氧诱导因子,缺氧,新陈代谢,重组,活性氧,多能性
摘要: Hypoxia is defined as a reduction in oxygen supply to a tissue below physiological levels. However, physiological hypoxic conditions occur during early embryonic development; and in adult organisms, many cells such as bone marrow stem cells are located within hypoxic niches. Thus, certain processes take place in hypoxia, and recent studies highlight the relevance of hypoxia in stem cell cancer physiology. Cellular response to hypoxia depends on hypoxia-inducible factors (HIFs), which are stabilized under low oxygen conditions. In a hypoxic context, various inducible HIF alpha subunits are able to form dimers with constant beta subunits and bind the hypoxia response elements (HRE) in the genome, acting as transcription factors, inducing a wide variety of gene expression. Typically, the HIF pathway has been shown to enhance vascular endothelial growth factor (VEGF) expression, which would be responsible for angiogenesis and, therefore, re-oxygenation of the hypoxic sites. Embryonic stem cells inhibit a severely hypoxic environment, which dictates their glycolytic metabolism, whereas differentiated cells shift toward the more efficient aerobic respiration for their metabolic demands. Accordingly, low oxygen tension levels have been reported to enhance induced pluripotent stem cell (iPS) generation. HIFs have also been shown to enhance pluripotency-related gene expression, including Oct4 (Octamer-binding transcription factor 4), Nanog and Wnt. Therefore, cell metabolism might play a role in stemness maintenance, proliferation and cell reprogramming. Moreover, in the hypoxic microenvironment of cancer cells, metabolism shifts from oxidative phosphorylation to anaerobic glycolysis, a process known as the Warburg effect, which is involved in cancer progression and malignancy.
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M.P. De Miguel, Y. Alcaina, D. Sainz de la Maza and P. Lopez-Iglesias , Cell Metabolism Under Microenvironmental Low Oxygen Tension Levels in Stemness, Proliferation and Pluripotency, Current Molecular Medicine 2015; 15 (4) . https://dx.doi.org/10.2174/1566524015666150505160406
DOI https://dx.doi.org/10.2174/1566524015666150505160406 |
Print ISSN 1566-5240 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-5666 |
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