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ULTRASTRUCTURAL LOCALIZATION OF A SOLUBLE COLLAGEN ANTIGEN

LIVIA LUSTIG 1

1 Departamento de Histología, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina

Soluble collagen antigen was localized at the ultrastructural level using an enzyme-labeled antibody technique. Specific antiserum against neutral salt-soluble collagen was conjugated with horseradish peroxidase. Tissue culture of fibroblasts, sections of chick embryo connective tissue and skin and tendon of newborn and adult chickens were incubated with the conjugated antiserum and processed for light and electron microscopy. Light microscopic observations showed a localization of the collagen antigen in the cytoplasm of fibroblasts and in the extracellular collagen fibers. Ultrastructurally, the antigen was found on the ribosomes, on the membranes of the rough endoplasmic reticulum, in the intracisternal material of fibroblasts and extracellularly in the collagen fibrils. The collagen fibrils of chick embryo cartilage were intensely stained while the matrix itself remained unstained. Controls performed with absorbed antiserum, conjugated normal rabbit serum or different antigens failed to react with the tissues.

Submitted on June 25, 1971


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