肠道缺氧诱导因子-2α在健康与疾病中的作用。
Role of Intestinal HIF-2α in Health and Disease.
作者信息
Ramakrishnan Sadeesh K, Shah Yatrik M
机构信息
Department of Molecular & Integrative Physiology and.
Division of Gastroenterology, Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, Michigan 48109; email:
出版信息
Annu Rev Physiol. 2016;78:301-25. doi: 10.1146/annurev-physiol-021115-105202. Epub 2015 Nov 19.
The intestine is supported by a complex vascular system that undergoes dynamic and transient daily shifts in blood perfusion, depending on the metabolic state. Moreover, the intestinal villi have a steep oxygen gradient from the hypoxic epithelium adjacent to the anoxic lumen to the relative higher tissue oxygenation at the base of villi. Due to the daily changes in tissue oxygen levels in the intestine, the hypoxic transcription factors hypoxia-inducible factor (HIF)-1α and HIF-2α are essential in maintaining intestinal homeostasis. HIF-2α is essential in maintaining proper micronutrient balance, the inflammatory response, and the regenerative and proliferative capacity of the intestine following an acute injury. However, chronic activation of HIF-2α leads to enhanced proinflammatory response, intestinal injury, and colorectal cancer. In this review, we detail the major mechanisms by which HIF-2α contributes to health and disease of the intestine and the therapeutic implications of targeting HIF-2α in intestinal diseases.
肠道由一个复杂的血管系统支撑,该系统会根据代谢状态每天进行动态且短暂的血液灌注变化。此外,肠绒毛存在陡峭的氧梯度,从邻近无氧肠腔的缺氧上皮到绒毛底部相对较高的组织氧合。由于肠道组织氧水平的每日变化,缺氧转录因子缺氧诱导因子(HIF)-1α和HIF-2α对于维持肠道稳态至关重要。HIF-2α对于维持适当的微量营养素平衡、炎症反应以及急性损伤后肠道的再生和增殖能力至关重要。然而,HIF-2α的慢性激活会导致促炎反应增强、肠道损伤和结直肠癌。在本综述中,我们详细阐述了HIF-2α促进肠道健康和疾病的主要机制以及靶向HIF-2α治疗肠道疾病的意义。