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Identification of gastric H,K-ATPase in an early vertebrate, the Atlantic stingray Dasyatis sabina
AJ Smolka, ER Lacy, L Luciano and E Reale
Department of Medicine, Medical University of South Carolina, Charleston 29425.
Virtually all vertebrates acidify their gastric contents to a pH between 0.8 and 2.0. In mammals, acid secretion is mediated by a K- stimulated proton-translocating adenosine triphosphatase (H,K-ATPase), which establishes a million-fold gradient of protons across the apical membrane of the gastric parietal cell. The earliest phylogenetic appearance of gastric acid secretion is in cartilaginous fish, and we sought to verify in this class (Chondrichthyes) the presence and distribution of H,K-ATPase in gastric epithelial cells. An antibody against a synthetic peptide based on the C-terminus of pig H,K-ATPase alpha-subunit was localized in the gastric glands of the Atlantic stingray Dasyatis sabina. The C-terminal antibody stained all cells with tubulovesicles and the apical membrane domain of mucous neck cells. In proximal stomach, gastric glands showed the strongest immunoreactivity in cells close to the isthmus; in the distal stomach, strongest immunoreactivity was found in cells at the base of the glands. Oxyntic cells were more intensely immunoreactive than oxynticopeptic cells. This antibody labeled a single band of M(r) 100,600 on immunoblots of D. sabina gastric microsomes. These results show the earliest phylogenetic occurrence of a gastric ATPase in putative acid-secreting cells and suggest that this enzyme shares structural features with mammalian H,K-ATPase.
Volume 42,
Issue 10,
pp. 1323-1332,
10/01/1994
Copyright © 1994 by The Histochemical Society
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