Human gastric intrinsic factor expression is not restricted to parietal cells

T. A. Howard, D. N. Misra, M. Grove, M. J. Becich, J. S. Shao, M. Gordon, D. H. Alpers

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Gastric parietal cells have been accepted as the only site of intrinsic factor production in the human stomach. In animals, however, intrinsic factor has been localised to various other cell types of foregut origin, including chief and enteroendocrine cells in gastric mucosa, and duct cells from salivary glands and pancreas. The availability of recombinant human intrinsic factor has led to production of high titre, monospecific antiserum which was used to reexamine the distribution and subcellular localisation of intrinsic factor in the human stomach. Immunolight microscopy revealed that most positively stained cells were gastric parietal cells, but at the margins of the anatomical regions (e.g. cardia/fundus, body/antrum) clusters of gastric chief cells and individual enteroendocrine cells were found to contain intrinsic factor. Immunoelectron microscopy demonstrated the highest antigen density on endocytic and apical membranes of parietal cells. Exocrine secretory granules of a subpopulation of chief cells, the secretory granules of some enteroendocrine cells, and the plasma membranes and smooth vesicles of endothelial cells of the lamina propria capillaries underlying enteroendocrine cells were also positive for the antigen. Labelling in all cells was specific, as it was abolished by preabsorption of the antisera with purified recombinant human intrinsic factor. These findings demonstrate a potential for cellular expression of human intrinsic factor in nonparietal cells. Because such expression occurs normally at the margins of anatomical gastric regions, it suggests that local factors may influence expression of intrinsic factor.

Original languageEnglish
Pages (from-to)303-313
Number of pages11
JournalJournal of Anatomy
Volume189
Issue number2
StatePublished - 1996

Keywords

  • Chief cells
  • Enteroendocrine cells
  • Stomach

Fingerprint

Dive into the research topics of 'Human gastric intrinsic factor expression is not restricted to parietal cells'. Together they form a unique fingerprint.

Cite this