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Experimental conditions have been designed that permit both extracellular and intracellular immunolocalization of various collagen types and fibronectin in rat liver. The procedure involves paraformaldehyde fixation by perfusion of the organ, use of saponin as a membrane permeabilizing agent, and visualization of the matrix components by indirect immunoperoxidase. Intracellular demonstration of collagens was particularly sensitive to the composition of the fixative and the duration of fixation. Hepatocytes contained fibronectin and types I and IV collagen, whereas fat-storing and endothelial cells evidenced type III collagen in addition. All the components were specifically located in the endoplasmic reticulum and/or the Golgi apparatus.

A procedure for light and electron microscopic intracellular immunolocalization of collagen and fibronectin in rat liver.