Modeling autosomal recessive cutis laxa type 1C in mice reveals distinct functions for Ltbp-4 isoforms.

Modeling autosomal recessive cutis laxa type 1C in mice reveals distinct functions for Ltbp-4 isoforms.
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DOI:
10.1242/dmm.018960
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发表时间:
2015-04
影响因子:
4.3
通讯作者:
Sterner-Kock A
Sterner-Kock A
中科院分区:
医学2区
文献类型:
--
作者:
Bultmann-Mellin I;Conradi A;Maul AC;Dinger K;Wempe F;Wohl AP;Imhof T;Wunderlich FT;Bunck AC;Nakamura T;Koli K;Bloch W;Ghanem A;Heinz A;von Melchner H;Sengle G;Sterner-Kock A

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最近的研究表明,LTBP-4在弹性细胞发生中发挥重要作用。它在人类中的突变失活导致常染色体隐性遗传性皮肤拉克萨1C型(ARCL 1C),这是一种由弹性纤维网络缺陷引起的严重疾病。虽然人类基因参与ARCL 1C已被发现的基础上,缺乏短Ltbp-4亚型(Ltbp 4S-/-)的小鼠表现出类似的弹性纤维异常,小鼠表型不复制ARCL 1C。因此,我们灭活了小鼠生殖系中的两种Ltbp-4同种型以模拟ARCL 1C。对Ltbp 4S −/−和Ltbp 4-null(Ltbp 4 −/−)小鼠的比较分析表明,Ltbp-4L是弹性蛋白生成和出生后存活的重要因素,并表明它具有不同的组织表达模式和特定的分子功能。我们鉴定了fibulin-4作为两种Ltbp-4同种型的先前未知的相互作用伴侣,并证明至少Ltbp-4L表达对于fibulin-4掺入细胞外基质(ECM)是必需的。总的来说,我们的研究结果有助于目前对弹性蛋白的理解,并提供了ARCL 1C的动物模型。
Recent studies have revealed an important role for LTBP-4 in elastogenesis. Its mutational inactivation in humans causes autosomal recessive cutis laxa type 1C (ARCL1C), which is a severe disorder caused by defects of the elastic fiber network. Although the human gene involved in ARCL1C has been discovered based on similar elastic fiber abnormalities exhibited by mice lacking the short Ltbp-4 isoform (Ltbp4S−/−), the murine phenotype does not replicate ARCL1C. We therefore inactivated both Ltbp-4 isoforms in the mouse germline to model ARCL1C. Comparative analysis of Ltbp4S−/− and Ltbp4-null (Ltbp4−/−) mice identified Ltbp-4L as an important factor for elastogenesis and postnatal survival, and showed that it has distinct tissue expression patterns and specific molecular functions. We identified fibulin-4 as a previously unknown interaction partner of both Ltbp-4 isoforms and demonstrated that at least Ltbp-4L expression is essential for incorporation of fibulin-4 into the extracellular matrix (ECM). Overall, our results contribute to the current understanding of elastogenesis and provide an animal model of ARCL1C.
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