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. 1987 Oct;6(10):2897–2905. doi: 10.1002/j.1460-2075.1987.tb02593.x

Contact-dependent regulation of vinculin expression in cultured fibroblasts: a study with vinculin-specific cDNA probes.

R Bendori 1, D Salomon 1, B Geiger 1
PMCID: PMC553724  PMID: 3121302

Abstract

Vinculin specific cDNA clones were isolated from chicken embryo fibroblast (CEF) cDNA library in lambda gt11. The clones, ranging in size from 2.8 to 5.0 kb, were initially selected by rabbit antibodies to vinculin. Their identity was further confirmed by their specific reactivities with a battery of different vinculin-specific monoclonal antibodies. Southern blot analysis of restriction enzyme digested chicken spleen DNA suggested that all the isolated cDNA clones correspond to the same gene(s). Northern blot hybridization revealed that the vinculin-specific cDNA clones react with a single 6.5 kb mRNA in total cellular RNA preparations of CEF, whole chicken embryos and chicken gizzard smooth muscle. Moreover, fractionation of CEF poly(A)+ RNA by sucrose gradient centrifugation followed by translation in cell free system indicated that the mRNA coding for vinculin has a size of about 6.0-7.0 kb. The identity of these clones was finally confirmed by selection hybridization assay. The isolated vinculin-specific cDNA probes were subsequently used in order to study the effect of substrate adhesiveness on the expression of vinculin. We show here that cells cultured on highly adhesive substrate, such as endothelial extracellular matrix (ECM), form large vinculin-rich focal contacts, while cells grown on poorly adhesive substrate poly(2-hydroxyethyl methacrylate) [poly(HEMA)] contain only small distorted vinculin spots. These morphological differences were accompanied by over 5-fold reduction in vinculin synthesis in cells growing on poly(HEMA), compared to those cultured on the ECM and over 7.5-fold decrease in the levels of vinculin-specific mRNA.(ABSTRACT TRUNCATED AT 250 WORDS)

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