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Nkx3.2 induces oxygen concentration-independent and lysosome-dependent degradation of HIF-1 alpha to modulate hypoxic responses in chondrocytes

机译:NKX3.2诱导氧浓度无关,依赖于HIF-1α的溶酶体依赖性降解,以调节软骨细胞中的缺氧反应

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摘要

Hypoxia-inducible factor 1-alpha (HIF-1 alpha) is a DNA-binding transcription factor regulating hypoxic responses. It plays a key role in vascularization and angiogenesis as well as various metabolic pathways. Interestingly, during early phase endochondral ossification when HIF expression in chondrocytes is evident, developing cartilage primordia remains avascular until hypertrophic calcification commences. In this work, we uncovered a novel pathway causing oxygen concentration-independent and proteasome-independent degradation of HIF-1 alpha protein. In this pathway, Nkx3.2, a chondrogenic factor, in conjunction with CHIP E3 ligase and p62/SQSTM1 adaptor, induces HIF-1 alpha degradation via a macroautophagy pathway in a hypoxic environment. Consistent with these findings, Nkx3.2 was capable of suppressing HIF-dependent reporter gene activity as well as endogenous HIF target genes in in vitro cell culture. Furthermore, we observed that cartilage-specific Nkx3.2 overexpression in mice attenuates HIF-1 alpha protein levels as well as vascularization in cartilage growth plates. Therefore, these results suggest that Nkx3.2-mediated HIF regulation may allow cartilage-specific avascularity under hypoxic conditions during endochondral skeleton development.
机译:缺氧诱导因子1-α(HIF-1α)是一种调节缺氧反应的DNA结合转录因子。它在血管化和血管生成以及各种代谢途径中起着关键作用。有趣的是,在早期阶段的脑内骨化期间,当软骨细胞中的HIF表达是明显的时,发育软骨原金属仍然是缺血,直至肥厚钙化开始。在这项工作中,我们发现了一种新的途径,导致氧气浓度无关,蛋白质体无抗HIF-1α蛋白的降解。在该途径中,NKX3.2,亲属因子与芯片E3连接酶和P62 / SQSTM1适配器结合,诱导HIF-1α通过缺氧环境中的显微育途径降解。与这些发现一致,NKX3.2能够抑制HIF依赖性报告基因活性以及体外细胞培养中的内源性HIF靶基因。此外,我们观察到小鼠的软骨特异性NKX3.2过表达衰减HIF-1α蛋白水平以及软骨生长板中的血管化。因此,这些结果表明,NKX3.2介导的HIF调节可以在缺氧条件下允许软骨特异性缺血性在内的骨架发育期间。

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