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Fibronectin in rat heart: a link between cardiac myocytes and collagen

GG Ahumada and JE Saffitz

Fibronectin, a glycoprotein that binds to collagen and modifies the adhesion properties and motility of cells in culture, is present in the interstitium of rat hearts. To localize fibronectin more precisely and to assess its relationship to the myocyte and to connective tissue elements, we employed a double antibody technique to label myocardial fibronectin with electron-dense ferritin to permit an ultrastructural analysis. Fibronectin was found to be associated with collagen, and in some cases appeared to link collagen fibers. Fibronectin was also found inserted along the surfaces of cardiac myocytes, connecting these cells to perimyocytic collagen. These ultrastructural relationships imply that fibronectin is a major component of the myocardial interstitium, and may affect myocardial compliance and control the motion of myocytes during the contraction and relaxation of the heart.

Volume 32, Issue 4, pp. 383-388, 04/01/1984
Copyright © 1984 by The Histochemical Society


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