Global defects in collagen secretion in a Mia3/TANGO1 knockout mouse.

Global defects in collagen secretion in a Mia3/TANGO1 knockout mouse.
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DOI:
10.1083/jcb.201007162
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发表时间:
2011-05-30
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Solloway MJ
Solloway MJ
中科院分区:
其他
文献类型:
--
作者:
Wilson DG;Phamluong K;Li L;Sun M;Cao TC;Liu PS;Modrusan Z;Sandoval WN;Rangell L;Carano RA;Peterson AS;Solloway MJ

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Mia3对蛋白质分泌的贡献比以前认识到的要广泛——它的缺失会损害胶原沉积和软骨和骨骼的正常发育。黑色素瘤抑制活性成员3 (MIA3/TANGO1)是一种进化保守的内质网驻留跨膜蛋白。最近的体外研究表明,它是将胶原VII(而不是胶原I)装载到copii包被的运输囊泡中所必需的。在本文中,我们发现缺乏Mia3的小鼠分泌多种胶原有缺陷,包括软骨细胞、成纤维细胞、内皮细胞和壁细胞中的胶原I、II、III、IV、VII和IX。胶原沉积由这些细胞类型是不正常的,细胞外基质组成受损。这些变化与细胞内胶原蛋白的积累和强烈的未折叠蛋白反应的诱导有关,主要是在发育中的骨骼内。在mia3缺失的胚胎中,软骨细胞成熟和骨矿化严重受损,导致侏儒症和新生儿死亡。因此,Mia3在蛋白质分泌中的作用比以前认识到的要广泛得多,事实上,它可能是高等生物中所有胶原蛋白分子有效分泌所必需的。
Mia3’s contribution to protein secretion is broader than previously realized—its absence impairs collagen deposition and normal development of cartilage and bone. Melanoma inhibitory activity member 3 (MIA3/TANGO1) is an evolutionarily conserved endoplasmic reticulum resident transmembrane protein. Recent in vitro studies have shown that it is required for the loading of collagen VII, but not collagen I, into COPII-coated transport vesicles. In this paper, we show that mice lacking Mia3 are defective for the secretion of numerous collagens, including collagens I, II, III, IV, VII, and IX, from chondrocytes, fibroblasts, endothelial cells, and mural cells. Collagen deposition by these cell types is abnormal, and extracellular matrix composition is compromised. These changes are associated with intracellular accumulation of collagen and the induction of a strong unfolded protein response, primarily within the developing skeleton. Chondrocyte maturation and bone mineralization are severely compromised in Mia3-null embryos, leading to dwarfism and neonatal lethality. Thus, Mia3’s role in protein secretion is much broader than previously realized, and it may, in fact, be required for the efficient secretion of all collagen molecules in higher organisms.
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