MT2-MMP-dependent release of collagen IV NC1 domains regulates submandibular gland branching morphogenesis.

MT2-MMP-dependent release of collagen IV NC1 domains regulates submandibular gland branching morphogenesis.
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MT2-MMP 依赖性 IV 型胶原 NC1 结构域的释放调节颌下腺分支形态发生。

DOI:
10.1016/j.devcel.2009.07.016
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发表时间:
2009-10
期刊:
影响因子:
11.8
通讯作者:
Hoffman, Matthew P.
Hoffman, Matthew P.
中科院分区:
生物学1区
文献类型:
--
作者:
Rebustini, Ivan T.;Myers, Christopher;Lassiter, Keyonica S.;Surmak, Andrew;Szabova, Ludmila;Holmbeck, Kenn;Pedchenko, Vadim;Hudson, Billy G.;Hoffman, Matthew P.

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蛋白水解是必不可少的分支形态发生过程中,但MT-MMPs及其蛋白水解产物的作用还不清楚。在这里,我们发现,降低MT-MMP活性在下颌下腺分支形态减少增殖和增加IV型胶原和MT-MMP的表达。重要的是,减少上皮MT 2-MMP显著降低增殖和形态发生,增加Col 4a 2和IV型胶原的细胞内积累,并减少IV型胶原NC 1结构域的蛋白水解释放。重要的是,我们证明了胶原IV NC 1结构域在发育组织中的存在。此外,重组胶原IV NC 1结构域在MT 2-siRNA处理后挽救分支形态发生,通过β1整联蛋白和PI 3 K-AKT信号传导增加MT-MMP和促增殖基因表达。此外,HBEGF还挽救了MT 2-siRNA治疗,增加了NC 1结构域的释放,增殖以及MT 2-MMP和Hbegf表达。我们的研究提供了如何MT 2-MMP-依赖性释放的生物活性的NC 1结构域从胶原IV是至关重要的整合胶原IV合成和蛋白水解与上皮细胞增殖在分支形态发生机制的见解。
Proteolysis is essential during branching morphogenesis, but the roles of MT-MMPs and their proteolytic products are not clearly understood. Here we discover that decreasing MT-MMP activity during submandibular gland branching morphogenesis decreases proliferation and increases collagen IV and MT-MMP expression. Importantly, reducing epithelial MT2-MMP profoundly decreases proliferation and morphogenesis, increases Col4a2 and intracellular accumulation of collagen IV, and decreases the proteolytic release of collagen IV NC1 domains. Importantly, we demonstrate the presence of collagen IV NC1 domains in developing tissue. Furthermore, recombinant collagen IV NC1 domains rescue branching morphogenesis after MT2-siRNA-treatment, increasing MT-MMP and pro-proliferative gene expression via β1 integrin and PI3K-AKT signaling. Additionally, HBEGF also rescues MT2-siRNA-treatment, increasing NC1 domain release, proliferation, and MT2-MMP and Hbegf expression. Our studies provide mechanistic insight into how MT2-MMP-dependent release of bioactive NC1 domains from collagen IV is critical for integrating collagen IV synthesis and proteolysis with epithelial proliferation during branching morphogenesis.
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