Ultrastructural Localization of Osteopontin Immunoreactivity in Phagolysosomes and Secretory Granules of Cells in Human Intestine

Overview

Journal Histochem J

Specialty Biochemistry

Date 1998 Feb 18

PMID 9466147

Citations 4

Authors

A M Dvorak

Affiliations

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Abstract

A post-embedding ultrastructural immunogold method was used to detect osteopontin in human intestinal biopsies with special emphasis on secretory and phagocytic organelles. Osteopontin immunoreactivity was localized to phagolysosomes of macrophages, fibroblasts, absorptive epithelial cells of the small intestine and Paneth cells. The mucigen secretory granules and Golgi structures of mucous epithelial cells of the small intestinal epithelium contained osteopontin, but secretory granules of numerous other cells, including Paneth cells, did not. Extracellular and phagocytosed Tropheryma whippelii within macrophage phagolysosomes also bound osteopontin. These localizations are supportive of a role for osteopontin in phagocytic and some secretory cell functions in human intestine.

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