BMP1 controls TGFbeta1 activation via cleavage of latent TGFbeta-binding protein.

BMP1 controls TGFbeta1 activation via cleavage of latent TGFbeta-binding protein.
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DOI:
10.1083/jcb.200606058
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发表时间:
2006-10-09
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Greenspan DS
Greenspan DS
中科院分区:
其他
文献类型:
--
作者:
Ge G;Greenspan DS

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转化生长因子β1(TGFβ1)是细胞行为的重要调节因子,以大的潜伏复合物(LLC)形式分泌,在该复合物中,TGF β 1与其裂解的前结构域(潜伏相关肽[LTP])结合,并通过LTP与潜伏TGFβ结合蛋白(LTBP)结合。后者将LLC靶向细胞外基质(ECM)。骨形态发生蛋白1(BMP 1)样金属蛋白酶通过将前体转化为成熟的功能蛋白而在ECM形成中发挥关键作用,并且通过切割拮抗剂Chordin以激活BMP 2/4而在形态发生模式中发挥关键作用。我们提供了体外和体内证据,证明BMP 1在两个特定位点切割LTBP 1,从而从ECM中释放LLC,并通过非BMP 1样蛋白酶切割TGFβ1导致随后的TGFβ1活化。在小鼠胚胎成纤维细胞中,显示出主要依赖于基质金属蛋白酶2的切割。TGFβ1是ECM形成和BMP 1表达的有效诱导剂。因此,BMP 1样蛋白酶在TGFβ1活化中的作用完成了脊椎动物组织重塑中的一个新的快进环。
Transforming growth factor β1 (TGFβ1), an important regulator of cell behavior, is secreted as a large latent complex (LLC) in which it is bound to its cleaved prodomain (latency-associated peptide [LAP]) and, via LAP, to latent TGFβ-binding proteins (LTBPs). The latter target LLCs to the extracellular matrix (ECM). Bone morphogenetic protein 1 (BMP1)–like metalloproteinases play key roles in ECM formation, by converting precursors into mature functional proteins, and in morphogenetic patterning, by cleaving the antagonist Chordin to activate BMP2/4. We provide in vitro and in vivo evidence that BMP1 cleaves LTBP1 at two specific sites, thus liberating LLC from ECM and resulting in consequent activation of TGFβ1 via cleavage of LAP by non–BMP1-like proteinases. In mouse embryo fibroblasts, LAP cleavage is shown to be predominantly matrix metalloproteinase 2 dependent. TGFβ1 is a potent inducer of ECM formation and of BMP1 expression. Thus, a role for BMP1-like proteinases in TGFβ1 activation completes a novel fast-forward loop in vertebrate tissue remodeling.
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