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目的 基于缺氧诱导因子-1α(HIF-1α)/Bcl2/腺病毒E1B相互作用蛋白3(BNIP3)通路的糖酵解探讨氧诱导新生小鼠视网膜血管生成机制。方法 将人脐静脉内皮细胞(HUVECs)分为常氧组、缺氧+si-NC组、缺氧+si-HIF-1α组和缺氧+si-HIF-1α+BNIP3组。常氧组HUVECs暴露于常氧(21%O2)下培养。缺氧+si-NC组、缺氧+si-HIF-1α组和缺氧+si-HIF-1α+BNIP3组用si-NC、si-HIF-1α或si-HIF-1α联合BNIP3质粒处理HUVECs 36 h,然后暴露于缺氧(1%O2)下培养。通过免疫荧光、代谢测量、细胞活力、划痕实验、管形成实验考察细胞线粒体自噬、糖酵解以及增殖、迁移和管形成情况。出生后第7天的C57BL/6J幼鼠随机分配到不同的治疗组：对照组、氧诱导视网膜病变(OIR)组、OIR+si-HIF-1α组和OIR+si-BNIP3组，测量新生血管形成和血管闭塞情况。结果 与常氧组比较，缺氧+si-NC组HUVECs中LC3+MitoTracker+斑点数、葡萄糖摄取和乳酸释放的速率增加(P<0.001)。与缺氧+si-NC组比较，缺氧+si-HIF-1α组HUVECs中LC3+MitoTracker+斑点数、葡萄糖摄取和乳酸释放的速率降低(P<0.01)。与常氧组比较，缺氧+si-NC组HUVECs在培养第72 h的增殖活性降低(P<0.05),并且伤口愈合面积和管形成数量增加(P<0.01)。与缺氧+si-NC组比较，缺氧+si-HIF-1α组HUVECs在培养第24、48、72小时的增殖活性降低(P<0.05),伤口愈合面积、管形成数量降低(P<0.001)。BNIP3的过表达逆转了HIF-1α敲低对线粒体自噬、糖酵解以及生物学功能的影响。与OIR组比较，OIR+si-HIF-1α组和OIR+si-BNIP3组小鼠的视网膜组织中新生血管形成和血管闭塞区域减少(P<0.05)。结论 HIF-1α/BNIP3信号通路在低氧条件下促进了HUVECs中线粒体自噬激活，其对于内皮功能和血管生成的调控有重要作用。
Abstract：Objective Based on glycolysis of hypoxia inducible factor-1α(HIF-1α)/Bcl2/adenovirus E1B interacting protein 3(BNIP3) pathway, to study the mechanism of oxygen-induced retinal angiogenesis in neonatal mice. Methods Human umbilical vein endothelial cells(HUVECs) were divided into normoxic group, hypoxia+si-NC group, hypoxia +si-HIF-1α group and hypoxia+si-HIF-1α+BNIP group. In normoxic group, HUVECs were exposed to normoxic(21% O2) and cultured. Hypoxia +si-NC group, hypoxia +si-HIF-1α group and hypoxia +si-HIF-1α+BNIP3 group were treated with si-NC, si-HIF-1α or si-HIF-1α combined with BNIP3 plasmid for 36 h, and then exposed to hypoxia(1% O2) for culture. The autophagy, glycolysis, proliferation, migration and tube formation of mitochondria were investigated by immunofluorescence, metabolic measurement, cell viability, scratch experiment and tube formation experiment. On the 7th day after birth, C57BL/6J mice were randomly assigned to different treatment groups: control group, oxygen-induced retinopathy(OIR) group, OIR+si-HIF-1α group and OIR+si-BNIP group. The neovascularization and vascular occlusion were measured. Results Compared with normoxic group, the rate of LC3+MitoTracker+ spots, glucose uptake and lactic acid release in HUVECs in hypoxia +si-NC group increased significantly(P<0.001). Compared with hypoxia +si-NC group, the rate of LC3+MitoTracker+ spots, glucose uptake and lactic acid release in HUVECs in hypoxia +si-HIF-1α group decreased significantly(P<0.01). Compared with normoxic group, the proliferation activity of HUVECs in hypoxia +si-NC group decreased significantly(P<0.05), and the wound healing area and the number of tubes formed increased significantly(P<0.01). Compared with hypoxia+si-NC group, the proliferation activity of HUVECs in hypoxia +si-HIF-1α group decreased significantly at the 24th, 48th and 72th hours of culture(P<0.05), and the wound healing area and the number of tubes formed decreased significantly(P<0.001). Overexpression of BNIP3 reversed the effects of HIF-1α knock-down on mitochondrial autophagy, glycolysis and biological function. Compared with OIR group, the neovascularization and vascular occlusion areas in retina of mice in OIR+si-HIF-1α group and OIR+si-BNIP3 group reduced significantly(P<0.05). Conclusion HIF-1α/BNIP3 signaling pathway promotes mitochondrial autophagy activation in HUVECs under hypoxia, which plays an important role in controlling endothelial function and angiogenesis.
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基本信息:
DOI：10.19405/j.cnki.issn1000-1492.2025.02.006
中图分类号:R774.1
引用信息:
[1]易燕,陈斐斐,谭赟等.HIF-1α/BNIP3通路介导的糖酵解与氧诱导新生小鼠视网膜血管生成的关系[J].安徽医科大学学报,2025,60(02):226-233.DOI:10.19405/j.cnki.issn1000-1492.2025.02.006.
基金信息:
湖北省自然科学基金(编号：2019CFB401)~~