Renal defects associated with improper polarization of the CRB and DLG polarity complexes in MALS-3 knockout mice.

Renal defects associated with improper polarization of the CRB and DLG polarity complexes in MALS-3 knockout mice.
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DOI:
10.1083/jcb.200702054
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发表时间:
2007-10-08
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Bredt DS
Bredt DS
中科院分区:
其他
文献类型:
--
作者:
Olsen O;Funke L;Long JF;Fukata M;Kazuta T;Trinidad JC;Moore KA;Misawa H;Welling PA;Burlingame AL;Zhang M;Bredt DS

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肾脏的发育和生理需要肾小管上皮细胞的极化。遗传学研究表明,无脊椎动物上皮细胞的极化需要面包屑、隔断-3和盘状大复合体。这些在进化上保守的蛋白质复合体存在于哺乳动物的肾脏中;然而,它们在肾脏发育中的作用仍然不清楚。在这里,我们发现缺乏小PDZ蛋白哺乳动物LIN-7c(MALS-3)的小鼠有低形态、囊性和纤维化的肾脏。蛋白质组学分析将MALS-3定义为面包屑和盘状大细胞极性复合体的唯一已知核心成分。MALS-3介导碎屑紧密连接复合体和盘状大基侧复合体的稳定组装,这些复合体在MALS-3基因敲除小鼠的肾上皮细胞中被破坏。有趣的是,在后肾间充质来源的上皮细胞中,MALS-3优先控制顶基底部的极性,而肾脏结构的缺陷完全归因于MALS在这些上皮细胞中的表达。这些研究表明,上皮细胞极化缺陷可导致囊性和纤维化肾脏疾病。
Kidney development and physiology require polarization of epithelia that line renal tubules. Genetic studies show that polarization of invertebrate epithelia requires the crumbs, partition-defective-3, and discs large complexes. These evolutionarily conserved protein complexes occur in mammalian kidney; however, their role in renal development remains poorly defined. Here, we find that mice lacking the small PDZ protein mammalian LIN-7c (MALS-3) have hypomorphic, cystic, and fibrotic kidneys. Proteomic analysis defines MALS-3 as the only known core component of both the crumbs and discs large cell polarity complexes. MALS-3 mediates stable assembly of the crumbs tight junction complex and the discs large basolateral complex, and these complexes are disrupted in renal epithelia from MALS-3 knockout mice. Interestingly, MALS-3 controls apico-basal polarity preferentially in epithelia derived from metanephric mesenchyme, and defects in kidney architecture owe solely to MALS expression in these epithelia. These studies demonstrate that defects in epithelial cell polarization can cause cystic and fibrotic renal disease.
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