Mechanical strain-induced posttranscriptional regulation of fibronectin production in fetal lung cells

被引:25
作者
Mourgeon, E
Xu, J
Tanswell, AK
Liu, MY
Post, M
机构
[1] Univ Toronto, Toronto Gen Hosp, Res Inst, Thorac Surg Res Lab,MRC,Grp Lung Dev,Dept Surg, Toronto, ON M5G 2C4, Canada
[2] Univ Toronto, Toronto Gen Hosp, Res Inst, Thorac Surg Res Lab,MRC,Grp Lung Dev,Dept Pediat, Toronto, ON M5G 2C4, Canada
[3] Univ Toronto, Toronto Gen Hosp, Res Inst, Thorac Surg Res Lab,MRC,Grp Lung Dev,Dept Physiol, Toronto, ON M5G 2C4, Canada
基金
加拿大健康研究院;
关键词
fetal lung development; mechanotransduction; gene expression; protein synthesis;
D O I
10.1152/ajplung.1999.277.1.L142
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
We have shown that intermittent mechanical strain, simulating fetal breathing movements, stimulated fetal rat lung cell proliferation. Because normal lung growth requires proper coordination between cell proliferation and extracellular matrix remodeling, we investigated the effect of strain on fibronectin metabolism. Organotypic cultures of fetal rat lung cells, subjected to intermittent strain, showed increased fibronectin content in the culture media. Fibronectin-degrading activity in media from strained cells was similar to that of static cultures. Northern analysis revealed that strain inhibited fibronectin mRNA accumulation seen during static culture. Synthesis of fibronectin, determined by metabolic labeling, was increased by strain despite lower mRNA levels or presence of actinomycin D. This increase was not mediated via a rapamycin-sensitive mechanism. Strain stimulated prelabeled fibronectin secretion even in the presence of cycloheximide. These results suggest that strain differentially regulates fibronectin production of fetal lung cells at the transcriptional and posttranscriptional levels. Mechanical strain increases soluble fibronectin content by stimulating its synthesis and secretion without increasing fibronectin message levels.
引用
收藏
页码:L142 / L149
页数:8
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