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pubmed-article:12099701pubmed:abstractTextPorcine thyrocytes in vitro in the presence of TSH adopt follicular-like morphology. Epidermal growth factor, phorbol esters or transforming growth factor beta-1 (TGFbeta-1) induce a rapid spreading of the cells and dedifferentiation. In addition to thyroglobulin, dedifferentiated thyrocytes secreted into the culture medium three proteins in abundant quantities. Two of them have been previously identified as thrombospondin-1 and clusterin, respectively. Using the microsequencing method we identified the third one, a M(r) 45,000 glycosylated protein, as plasminogen activator inhibitor-1 (PAI-1). EGF, phorbol esters or TGF-beta1 predominantly increased PAI-1 protein expression in TSH-treated cells. The maximal increase of PAI-1 mRNA steady-state level was observed 6 h after EGF treatment and sustained up to 48 h. Recombinant PAI-1 inhibited cell-associated plasmin activity and delayed cell spreading. Enhanced synthesis and secretion of PAI-1 upon treatment with different growth factors during dedifferentiation process and spreading may be considered a feed-back defence mechanism of the cells to harmful extracellular stimuli.lld:pubmed
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pubmed-article:12099701pubmed:copyrightInfo(c) 2002 Elsevier Science (USA).lld:pubmed
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pubmed-article:12099701pubmed:pagination737-43lld:pubmed
pubmed-article:12099701pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:12099701pubmed:articleTitleEnhanced expression of plasminogen activator inhibitor-1 by dedifferentiated thyrocytes.lld:pubmed
pubmed-article:12099701pubmed:affiliationLaboratoire de Biochimie, CNRS FRE 2534, Faculté de Médecine, IFR 53, 51 095 Reims Cedex, France.lld:pubmed
pubmed-article:12099701pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:12099701pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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