Rho GAP myosin IXa is a regulator of kidney tubule function.

Rho GAP myosin IXa is a regulator of kidney tubule function.
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Rho GAP 肌球蛋白 IXa 是肾小管功能的调节剂

DOI:
10.1152/ajprenal.00220.2014
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发表时间:
2015
期刊:
American journal of physiology. Renal physiology
影响因子:
--
通讯作者:
Bähler M.
Bähler M.
中科院分区:
--
文献类型:
--
作者:
Thelen S;Abouhamed M;Ciarimboli G;Edemir B;Bähler M.

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哺乳动物IX类肌球蛋白Myo 9a是具有Rho GTP酶激活蛋白活性的单头肌动蛋白依赖性马达蛋白,其负调节Rho GTP酶信号传导。Myo 9a在几种器官的纤毛上皮细胞中大量表达。在小鼠中,Myo 9a的基因缺失导致脑积水的形成。Myo 9a是否在身体其他器官的上皮中也具有重要功能尚未探索。在本研究中,我们报告说,Myo 9a缺陷小鼠发展双边肾脏疾病,其特征在于近端小管扩张,肾盏扩张,薄壁组织变薄和纤维化。这些结构变化伴随着多尿(加压素水平正常)和低分子量蛋白尿。免疫组化显示Myo 9a定位于近曲小管细胞的周向F-肌动蛋白带。在缺乏Myo 9a的肾脏中,多配体结合受体巨蛋白及其配体白蛋白在Myo 9a缺乏的近端肾小管细胞的管腔表面积累,表明内吞作用失调。此外,我们惊奇地发现,鼠透明相关的Rho效应子α-1的水平在Myo 9a缺陷的肾脏中以及在Myo 9a敲低的LLC-PK 1细胞中降低。总之,Rho GTP酶激活蛋白Myo 9a在小鼠中的缺失导致近端肾小管扩张和纤维化,我们推测,下调小鼠透光相关的β-l和受损的蛋白质重吸收有助于病理生理学。
Mammalian class IX myosin Myo9a is a single-headed, actin-dependent motor protein with Rho GTPase-activating protein activity that negatively regulates Rho GTPase signaling. Myo9a is abundantly expressed in ciliated epithelial cells of several organs. In mice, genetic deletion of Myo9a leads to the formation of hydrocephalus. Whether Myo9a also has essential functions in the epithelia of other organs of the body has not been explored. In the present study, we report that Myo9a-deficient mice develop bilateral renal disease, characterized by dilation of proximal tubules, calyceal dilation, and thinning of the parenchyma and fibrosis. These structural changes are accompanied by polyuria (with normal vasopressin levels) and low-molecular-weight proteinuria. Immunohistochemistry revealed that Myo9a is localized to the circumferential F-actin belt of proximal tubule cells. In kidneys lacking Myo9a, the multiligand binding receptor megalin and its ligand albumin accumulated at the luminal surface of Myo9a-deficient proximal tubular cells, suggesting that endocytosis is dysregulated. In addition, we found, surprisingly, that levels of murine diaphanous-related formin-1, a Rho effector, were decreased in Myo9a-deficient kidneys as well as in Myo9a knockdown LLC-PK1 cells. In summary, deletion of the Rho GTPase-activating protein Myo9a in mice causes proximal tubular dilation and fibrosis, and we speculate that downregulation of murine diaphanous-related formin-1 and impaired protein reabsorption contribute to the pathophysiology.
尿蛋白诱导近曲小管细胞中的单核细胞趋化蛋白-1。
DOI: --
发表时间: 1997
影响因子: 13.6
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Y. Wang;J. Chen;L. Chen;Y. Tay;G. Rangan;D. Harris
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DOI: 10.1097/01.asn.0000067652.51441.21
发表时间: 2003-06-01
影响因子: 13.6
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内吞作用缺陷可能是多囊肾病蛋白尿的原因。
DOI: --
发表时间: 2001
期刊: AJP - Renal Physiology
影响因子: --
作者:
N. Obermüller;B. Kränzlin;W. Blum;N. Gretz;R. Witzgall
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DOI: 10.1111/j.1365-2443.2005.00895.x
发表时间: 2005-10-01
期刊: GENES TO CELLS
影响因子: 2.1
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DOI: 10.1046/j.1523-1755.2003.00775.x
发表时间: 2003-02-01
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Cachat, F;Lange-Sperandio, B;Chevalier, RL
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