Enhanced cartilage regeneration in MIA/CD-RAP deficient mice.

Enhanced cartilage regeneration in MIA/CD-RAP deficient mice.
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MIA/CD-RAP缺乏小鼠的软骨再生增强。

DOI:
10.1038/cddis.2010.78
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发表时间:
2010-11-11
影响因子:
9
通讯作者:
--
中科院分区:
生物学1区
文献类型:
--
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黑色素瘤抑制活性/软骨来源的维甲酸敏感蛋白(MIA/CD-RAP)是一种由软骨细胞分泌的小分子可溶性蛋白。它被鉴定为采用SH3结构域样折叠的胞外蛋白家族的原型。为了详细研究MIA/CD-RAP缺乏的后果,我们使用了MIA/CD-RAP靶向基因中断的小鼠(MIA−/−),并分析了体内和体外模型的软骨组织和分化。除了使用MIA−/−小鼠的间充质干细胞进行体外研究外,还在体内测定了骨关节炎和骨折愈合模型中软骨的形成和再生。有趣的是,我们的数据表明,在MIA−/−小鼠中,软骨细胞的再生受到增强的增殖和延迟分化的调节。对−/−小鼠软骨组织的表达分析显示,核糖核酸结合蛋白54-kDa(P54nrb)强烈下调,这是最近被描述的Sox9活性的调节因子。在本研究中,我们提出了p54nrb作为MIA/CD-RAP促进软骨形成的介体。综上所述,我们的数据表明,MIA/CD-RAP可能通过调节分化过程中的信号过程而参与软骨分化。
Melanoma inhibitory activity/cartilage-derived retinoic acid-sensitive protein (MIA/CD-RAP) is a small soluble protein secreted from chondrocytes. It was identified as the prototype of a family of extracellular proteins adopting an SH3 domain-like fold. In order to study the consequences of MIA/CD-RAP deficiency in detail we used mice with a targeted gene disruption of MIA/CD-RAP (MIA−/−) and analyzed cartilage organisation and differentiation in in vivo and in vitro models. Cartilage formation and regeneration was determined in models for osteoarthritis and fracture healing in vivo, in addition to in vitro studies using mesenchymal stem cells of MIA−/− mice. Interestingly, our data suggest enhanced chondrocytic regeneration in the MIA−/− mice, modulated by enhanced proliferation and delayed differentiation. Expression analysis of cartilage tissue derived from MIA−/− mice revealed strong downregulation of nuclear RNA-binding protein 54-kDa (p54nrb), a recently described modulator of Sox9 activity. In this study, we present p54nrb as a mediator of MIA/CD-RAP to promote chondrogenesis. Taken together, our data indicate that MIA/CD-RAP is required for differentiation in cartilage potentially by regulating signaling processes during differentiation.
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发表时间: 2006-01-01
影响因子: 3.7
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