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We investigated the localization of cytosol 5'-nucleotidase in chicken liver by use of a pre-embedding immunoenzyme technique. Cytosol 5'-nucleotidase was purified from chicken liver and a monospecific antibody to this enzyme was raised in a rabbit. Fab fragments of the antibody were conjugated with horseradish peroxidase. Tissue sections of the fixed chicken liver were incubated with the peroxidase-Fab fragments, followed by DAB reaction for peroxidase. By light microscopy, dark-brown staining was present in the cytoplasm of parenchymal cells, Kupffer cells, and endothelial cells. The latter two types of cells were stained more strongly than the former. By electron microscopy, reaction deposits were present in the cytoplasmic matrix but not in cell organelles, such as mitochondria, endoplasmic reticulum, and peroxisomes, or in nuclei. In control sections incubated with peroxidase-conjugated Fab fragments from non-immunized rabbit, no specific reaction was noted. The results indicate that cytosol 5'-nucleotidase is contained more in the sinus-lining cells and less in the parenchymal cells, and that the enzyme is present in the cytoplasmic matrix of these cells.

Immunocytochemical localization of cytosol 5'-nucleotidase in chicken liver.