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Immunohistochemical localization of galactosyltransferase (UDP-galactose: 2-acetamido-2-deoxy beta-D-glucopyranose beta (1-4) transferase) in human tissue specimens of gastric and jejunal mucosa, exocrine pancreas, and liver was carried out at the light microscopic level using affinity purified rabbit anti-human milk galactosyltransferase antibodies. Intracellular localization of galactosyltransferase in epithelial cells appeared as a triangular compact structure close to the apical pole of the nucleus. In hepatocytes, the enzyme was found in discrete spots in the cytoplasm between the nuclei and the bile canaliculi. In addition to the intracellular, juxtanuclear location an intense reaction at the luminal part of the cell surface was found in the lining epithelium of the stomach, in enterocytes of the jejunal villus tips, and in ductular cells of the pancreas. Enterocytes located in the middle portion along the cryptvillus gradient exhibited cytoplasmic staining adjacent to the brush borders. Basolateral membranes appeared negative. Little or no enzyme could be demonstrated in cells belonging to the connective tissue. These results show that secretory cells contain a Golgi apparatus which can be visualized at the light microscopic level by virtue of its content in galactosyltransferase. Presence of galactosyltransferase antigen on the surface of certain cells supports the assumption that ectoglycosyltransferases do exist, at sites, however, apparently not involved in cell contact and adhesion.

Immunohistochemical evidence for cell surface and Golgi localization of galactosyltransferase in human stomach, jejunum, liver and pancreas.