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• W1992565802 abstract "Fibronectin (FN) has a complex pattern of alternative splicing at the mRNA level. One of the alternatively spliced segments, EDA, is prominently expressed during biological processes involving substantial cell migration and proliferation, such as embryonic development, malignant transformation, and wound healing. To examine the function of the EDA segment, we overexpressed recombinant FN isoforms with or without EDA in CHO cells and compared their cell-adhesive activities using purified proteins. EDA+ FN was significantly more potent than EDA− FN in promoting cell spreading and cell migration, irrespective of the presence or absence of a second alternatively spliced segment, EDB. The cell spreading activity of EDA+ FN was not affected by antibodies recognizing the EDA segment but was abolished by antibodies against integrin α5 and β1 subunits and by Gly-Arg-Gly-Asp-Ser-Pro peptide, indicating that the EDA segment enhanced the cell-adhesive activity of FN by potentiating the interaction of FN with integrin α5β1. In support of this conclusion, purified integrin α5β1 bound more avidly to EDA+ FN than to EDA− FN. Augmentation of integrin binding by the EDA segment was, however, observed only in the context of the intact FN molecule, since the difference in integrin-binding activity between EDA+ FN and EDA− FN was abolished after limited proteolysis with thermolysin. Consistent with this observation, binding of integrin α5β1 to a recombinant FN fragment, consisting of the central cell-binding domain and the adjacent heparin-binding domain Hep2, was not affected by insertion of the EDA segment. Since the insertion of an extra type III module such as EDA into an array of repeated type III modules is expected to rotate the polypeptide up to 180° at the position of the insertion, the conformation of the FN molecule may be globally altered upon insertion of the EDA segment, resulting in an increased exposure of the RGD motif in III10 module and/or local unfolding of the module. Our results suggest that alternative splicing at the EDA exon is a novel mechanism for up-regulating integrin-binding affinity of FN operating when enhanced migration and proliferation of cells are required." @default.
• W1992565802 created "2016-06-24" @default.
• W1992565802 creator A5010280265 @default.
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• W1992565802 date "1997-10-06" @default.
• W1992565802 modified "2023-10-11" @default.
• W1992565802 title "Modulation of Cell-adhesive Activity of Fibronectin by the Alternatively Spliced EDA Segment" @default.
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• W1992565802 doi "https://doi.org/10.1083/jcb.139.1.295" @default.
• W1992565802 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2139828" @default.
• W1992565802 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9314547" @default.
• W1992565802 hasPublicationYear "1997" @default.
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