Rab35 governs apicobasal polarity through regulation of actin dynamics during sprouting angiogenesis.

Rab35 governs apicobasal polarity through regulation of actin dynamics during sprouting angiogenesis.
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DOI:
10.1038/s41467-022-32853-5
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发表时间:
2022-09-08
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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在早期血管发育中,运输程序,如使用Rab GTP酶的程序,的任务是以高时空准确性递送囊泡货物。然而,许多Rab运输蛋白在内皮组织中的功能仍然不明确,因此,它们与血管发育的相关性尚不清楚。Rab 35在不同组织和生物体的细胞行为中起着神秘的作用。重要的是,Rab 35从未被表征为其在萌芽血管生成中的潜在贡献;因此,我们的目标是绘制Rab 35在血管生成中的主要功能。我们的研究结果表明,Rab 35是芽形成的关键,在它的情况下,apicobasal极性完全失去了在体外和体内。为了确定机制,我们系统地探索了已建立的Rab 35效应子,并显示在内皮细胞中没有一个是有效的。然而,我们发现Rab 35与DENNd 1c(一种进化上不同的鸟嘌呤交换因子)合作伙伴定位于肌动蛋白。在这里,Rab 35通过限制Rac 1和RhoA活性来调节肌动蛋白聚合,这是在芽形成期间建立适当的顶基极性所必需的。我们的研究结果表明Rab 35是血管发育过程中肌动蛋白重塑的有效制动器。混杂的GTCRab 35已被证明参与许多重要的细胞功能。在这篇文章中,弗朗西斯等人阐述了Rab 35如何在萌芽血管生成过程中作为肌动蛋白重塑的关键制动器,以及它如何对适当的血管发育是必要的。
In early blood vessel development, trafficking programs, such as those using Rab GTPases, are tasked with delivering vesicular cargo with high spatiotemporal accuracy. However, the function of many Rab trafficking proteins remain ill-defined in endothelial tissue; therefore, their relevance to blood vessel development is unknown. Rab35 has been shown to play an enigmatic role in cellular behaviors which differs greatly between tissue-type and organism. Importantly, Rab35 has never been characterized for its potential contribution in sprouting angiogenesis; thus, our goal was to map Rab35’s primary function in angiogenesis. Our results demonstrate that Rab35 is critical for sprout formation; in its absence, apicobasal polarity is entirely lost in vitro and in vivo. To determine mechanism, we systematically explored established Rab35 effectors and show that none are operative in endothelial cells. However, we find that Rab35 partners with DENNd1c, an evolutionarily divergent guanine exchange factor, to localize to actin. Here, Rab35 regulates actin polymerization through limiting Rac1 and RhoA activity, which is required to set up proper apicobasal polarity during sprout formation. Our findings establish that Rab35 is a potent brake of actin remodeling during blood vessel development. The promiscuous GTPase Rab35 has been shown to be involved in many important cellular functions. In this article, Francis et al. illustrate how Rab35 acts as a critical brake to actin remodeling during sprouting angiogenesis and how it is necessary for proper blood vessel development.
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