title: [Valve of a freeze-dried gelatin-agarose combination in selective extraction of fibronectin from human plasma].
abstract: We report here a simple procedure for the isolation of human plasma fibronectin by affinity adsorption on a new lyophilized adsorbent which is obtained by mixing and polymerizing agarose with gelatin. This method permits to obtain fibronectin and a fibronectin-depleted plasma without dilution. The yield of fibronectin is about 20 to 25 per cent. Fibronectin was identified by cross-reactions against specific antibodies. Its purity (greater than or equal to 99 per cent) was controlled by immunoelectrophoresis and SDS-PAGE. Furthermore, its biological activity was demonstrated by a spreading test performed on BHK cells. Such a test can be used to determine the specific activity of extracted fibronectin considering that the number of spread cells placed in presence of exogenous fibronectin (5 microgram/ml of culture medium) was 4.5 to 5 fold-superior to the control, after 30 minutes of incubation at 37 degrees C.
mesh_terms: D000918:Antibody Specificity; D002847:Chromatography, Agarose / Q000379:methods*; D002850:Chromatography, Gel / Q000379:methods*; D003429:Cross Reactions; D005353:Fibronectins / Q000097:blood / Q000302:isolation & purification*; D006801:Humans; D007122:Immunoelectrophoresis
chemical_list: D005353:Fibronectins
vernacular_title: Intérêt d'une combinaison gélatine-agarose cryodesséchée pour l'extraction sélective de la fibronectine à partir du plasma humain.