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• W2307745757 endingPage "520" @default.
• W2307745757 startingPage "507" @default.
• W2307745757 abstract "ABSTRACT We tested whether aortic endothelial cell (EC)-synthesized substrata, which modulate smooth muscle cell proliferation and EC motility following injury, could influence EC actin cytoskeleton and spreading in vitro. A partial characterization of the substrata indicates that the substratum prepared by deoxycholic acid extraction (DOC-derived substratum) is enriched with fibronectin and type IV collagen. Substratum prepared by removal of the intact monolayer with 20 mM EGTA in PBS (EGTA-derived substratum) contains fibronectin and heparan sulfate proteoglycan, but no type IV collagen. Morphometric analyses were performed on fixed and cytoskeletal antibody treated EC in order to quantitate the extent of spreading and stress fiber (SF) assembly. Compared to plastic, the DOC-derived substratum, a collagenase-treated DOC-derived substratum (CT-DOC-derived substratum) and the EGTA-derived substratum promote EC spreading 2·3-, 2·9- and 1·7-fold, respectively. In addition, there are 4·2-, 4·1- and 2·0-fold more SF on DOC-, CT-DOC- and EGTA-derived substrata, respectively, when compared to plastic. Subcellular fractionation and immunoprecipitation of cytoskeletal proteins from metabolically labeled EC were performed prior to electrophoresis and fluorography. The DOC-derived substratum increases immunoprecipitable actin and myosin 3-to 4.5-fold in both fractions compared to the EGTA-derived substratum and plastic. Collagenase treatment of the DOC-derived substratum partially inhibits this increase. Cycloheximide treatment prevents the rise in soluble actin and myosin as well as causing a reduction in SF number by 1/2 on the DOC-derived substratum and 2/3 on CT-DOC-derived substratum. We propose that fibronectin-collagen interactions are, in part, responsible for inducing endothelial synthesis of cytoskeletal proteins required for SF assembly. This substratum-induced actin-cytoskeletal reorganization facilitates EC spreading in vitro." @default.
• W2307745757 created "2016-06-24" @default.
• W2307745757 creator A5007751601 @default.
• W2307745757 creator A5077822196 @default.
• W2307745757 date "1990-03-01" @default.
• W2307745757 modified "2023-10-09" @default.
• W2307745757 title "Substratum-induced stress fiber assembly in vascular endothelial cells during spreading <i>in vitro</i>" @default.
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• W2307745757 doi "https://doi.org/10.1242/jcs.95.3.507" @default.
• W2307745757 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/2200794" @default.
• W2307745757 hasPublicationYear "1990" @default.
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