ALK-5 mediates endogenous and TGF-beta1-induced expression of connective tissue growth factor in embryonic lung.

ALK-5 mediates endogenous and TGF-beta1-induced expression of connective tissue growth factor in embryonic lung.
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ALK-5 介导胚胎肺中结缔组织生长因子的内源性和 TGF-β1 诱导的表达。

DOI:
10.1165/rcmb.2006-0320oc
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发表时间:
2007
影响因子:
6.4
通讯作者:
Bancalari,Eduardo
Bancalari,Eduardo
中科院分区:
医学1区
文献类型:
--
作者:
Wu,Shu;Peng,Jinghong;Duncan,MatthewR;Kasisomayajula,Kalyani;Grotendorst,Gary;Bancalari,Eduardo

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转化生长因子β1(Transforming growth factor-β1,TGF-β1)是肺分支形态发生的主要负调节因子。由于结缔组织生长因子(CTGF)是TGF-β1对间充质细胞作用的下游介质,我们假设TGF-β1诱导小鼠胚胎肺外植体中CTGF的表达,并且CTGF介导TGF-β1对分支形态发生的抑制。我们发现,在胚胎12.5天的无血清培养液中加入TGF-β1可以抑制肺组织的分支形态发生,并以时间和剂量依赖的方式诱导CTGF mRNA的表达。与仅定位于远端气道上皮的基础内源性CTGF蛋白相反,TGF-β1诱导的CTGF蛋白定位于上皮和间充质中。培养基中添加外源CTGF直接抑制分枝形态发生。为了确定TGF-β1诱导CTGF的信号转导途径,我们使用了一种TGF-β I型受体(TβRI)/ALK-5的特异性抑制剂SB 431542来阻断TGF-β1诱导的Smad 2/3磷酸化。因此,SB 431542刺激正常分支形态发生并阻断TGF-β1对分支的抑制。此外,SB-431542阻断内源性和TGF-β1诱导的CTGF mRNA和蛋白的表达。这些结果首次证明,TGF-β1诱导小鼠胚胎肺外植体中CTGF表达,CTGF抑制分支形态发生,内源性和TGF-β1诱导的CTGF表达均由TβRI/ALK-5依赖性Smad 2信号通路介导。
Transforming growth factor-β1 (TGF-β1) has been implicated as a major negative regulator of lung branching morphogenesis. Since connective tissue growth factor (CTGF) is a downstream mediator of TGF-β1 effects on mesenchymal cells, we hypothesized that TGF-β1 induces CTGF expression in mouse embryonic lung explants and that CTGF mediates TGF-β1 inhibition of branching morphogenesis. We show that addition of TGF-β1 to the serum-free medium of embryonic day (E)12.5 lung explant cultures inhibited branching morphogenesis and induced CTGF mRNA expression in time- and dose-dependent manners. In contrast to basal endogenous CTGF protein, which was exclusively localized in the distal airway epithelium, TGF-β1–induced CTGF protein was localized in both the epithelium and the mesenchyme. Addition of exogenous CTGF to culture medium directly inhibited branching morphogenesis. To identify the signal transduction pathway through which TGF-β1 induces CTGF, we used SB431542, a specific inhibitor for TGF-β type I receptor (TβRI)/ALK-5 to block TGF-β1–induced Smad2/3 phosphorylation. Consequently, SB431542 stimulated normal branching morphogenesis and blocked TGF-β1 inhibition of branching. Furthermore, SB-431542 blocked both endogenous and TGF-β1–induced expression of CTGF mRNA and protein. These results demonstrate for the first time that TGF-β1 induces CTGF expression in mouse embryonic lung explants, that CTGF inhibits branching morphogenesis, and that both endogenous and TGF-β1–induced CTGF expression are mediated by the TβRI/ALK-5–dependent Smad2 signaling pathway.
DOI: 10.1038/labinvest.3700376
发表时间: 2006-02
影响因子: 5
作者:
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发表时间: 1994
期刊: Development (Cambridge, England)
影响因子: --
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发表时间: 1996-09-01
影响因子: 6.5
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通讯作者: Grotendorst, GR
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DOI: 10.1152/ajplung.1995.269.3.l419
发表时间: 1995
期刊: The American journal of physiology.
影响因子: --
作者:
Zhao,Y;Young,SL
通讯作者: Young,SL
pRb 对于胚胎肺器官培养物中 TGF-β1 抑制 N-myc 表达是必需的。
DOI: 10.1242/dev.121.9.3057
发表时间: 1995
期刊: Development (Cambridge, England)
影响因子: --
作者:
Serra,R;Moses,HL
通讯作者: Moses,HL