title: Concentration of fibronectin in plasma of tumor-bearing mice and synthesis by Ehrlich ascites tumor cells.
abstract: In the present paper we have studied: (a) the concentration of fibronectin (FN) in plasma and in ascitic fluid of mice at different times after inoculation of Ehrlich ascites tumor cells; (b) the ability of Ehrlich ascites cells to synthesize and release FN; and (c) the localization of FN in Ehrlich ascites cells by immunofluorescence microscopy. It was found that (a) 4 to 5 days after inoculation of the tumor, the plasma concentration of FN was significantly higher [1.7 +/- 0.07% (S.E.) of total plasma protein] than that in the normal control mice (0.8 +/- 0.035); (b) FN is present in the ascitic fluid in all phases of tumor growth; (c) Ehrlich ascites cells cultured in vitro synthesize and release large amounts of FN in the culture medium; and (d) only about 1 to 2% of the tumor cells show a very small amount of FN, and this is mostly in the area of cell-cell contact.
mesh_terms: D000818:Animals; D001202:Ascitic Fluid / Q000378:metabolism; D002286:Carcinoma, Ehrlich Tumor / Q000378:metabolism*; D002478:Cells, Cultured; D005260:Female; D005353:Fibronectins / Q000097:blood / Q000378:metabolism; D005455:Fluorescent Antibody Technique; D051379:Mice
chemical_list: D005353:Fibronectins