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
中科院分区:
文献类型:
--
作者:
Wu,Shu;Peng,Jinghong;Duncan,MatthewR;Kasisomayajula,Kalyani;Grotendorst,Gary;Bancalari,Eduardo
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.
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影响因子:
5
作者:
T. Seki;Kwon-Ho Hong;S. P. Oh
通讯作者:
T. Seki;Kwon-Ho Hong;S. P. Oh
DOI:
10.1242/dev.120.8.2153
发表时间:
1994
期刊:
Development (Cambridge, England)
影响因子:
--
作者:
Serra,R;Pelton,RW;Moses,HL
通讯作者:
Moses,HL
影响因子:
6.5
作者:
Frazier, K;Williams, S;Grotendorst, GR
通讯作者:
Grotendorst, GR
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
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