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Exogenous plasma and endogenous cellular fibronectins on the surface of cultured fibroblasts and in extracellular matrix fibrils were colocalized by fluorescent and high voltage immunoelectron microscopy. Fibroblast cultures grown in the presence or absence of cycloheximide were incubated with exogenous plasma fibronectin labeled with fluorescein isothiocyanate. A monoclonal antibody specific for the EIIIA sequence of cellular fibronectin was used to detect cellular fibronectin. A rabbit antifluorescein antibody identified fluoresceinated plasma fibronectin. In cultures incubated in the presence of cycloheximide, plasma fibronectin was bound to the cell surface and was assembled into extracellular fibrils. In cultures grown in the absence of cycloheximide, plasma and cellular fibronectins were observed in the same matrix fibrils and in the same locations on the cell surface. There was not, however, random admixture of the two proteins.

Co-assembly of plasma and cellular fibronectins into fibrils in human fibroblast cultures.