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Endothelial cell HIF-1α and HIF-2α differentially regulate metastatic success

机译:内皮细胞HIF-1α和HIF-2α差异调节转移成功

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摘要

The hypoxia inducible transcription factors (HIFs) control many mediators of vascular response, including both angiogenic factors and small molecules such as nitric oxide (NO). In studying how endothelial HIF response itself affects metastasis, we found that loss of HIF-1α in endothelial cells reduces NO synthesis, retards tumor cell migration through endothelial layers, and restricts tumor cell metastasis, and that loss of HIF-2α has in each case the opposite effect. This results from differential regulation of NO homeostasis that in turn regulates vascular endothelial growth factor expression in an NO-dependent feedback loop. These opposing roles for the two HIF factors indicate that both they and endothelial cells regulate metastasis as malignancy progresses.
机译:缺氧诱导转录因子(HIF)控制着许多血管反应介质,包括血管生成因子和小分子,例如一氧化氮(NO)。在研究内皮细胞HIF反应本身如何影响转移时,我们发现内皮细胞中HIF-1α的丢失会减少NO的合成,阻碍肿瘤细胞通过内皮层的迁移,并限制肿瘤细胞的转移,而HIF-2α的丢失在每种情况下都有相反的效果。这归因于NO稳态的差异调节,而NO稳态又调节了NO依赖性反馈回路中的血管内皮生长因子的表达。这两种HIF因子的相反作用表明,随着恶性肿瘤的发展,它们和内皮细胞均调节转移。

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