Differential expression of vacuolar-type H+-ATPase between normal human pancreatic islet B-cells and insulinoma cells

  • Authors:
    • T Ohta
    • M Yamamoto
    • M Numata
    • S Iseki
    • H Kitagawa
    • M Kayahara
    • T Nagakawa
    • K Miwa
    • A Nakagawa
    • T Morise
    • S Ohkuma
    • T Terada
  • View Affiliations

  • Published online on: September 1, 1997     https://doi.org/10.3892/ijo.11.3.597
  • Pages: 597-601
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Abstract

Recent studies have shown that bafilomycin A(1)-sensitive vacuolar type H+-ATPase (V-ATPase) is responsible for the acidification of intracellular compartments in eukaryotic cells. B-cells of pancreatic islets also are known to include acidifying secretory vesicles which are the major cellular site of proinsulin to insulin conversion. This study was designed to examine immunohistochemically the level of V-ATPase protein expression in normal pancreas (five cases) and benign insulinoma (six cases), using mouse monoclonal antibody raised against the 116 kDa subunit of human V-ATPase. Light microscopic immunohistochemistry revealed that moderate to marked V-ATPase expression was observed in normal islet B-cells, while insulinoma cells in each case expressed V-ATPase faintly or not at all. By immunoelectron microscopy, the majority of secretory vesicles in insulinoma cells did not express V-ATPase protein at their endomembranes, although mild to marked V-ATPase expression was noted at the endomembrane of secretory vesicles in normal islet B-cells. Thus, differential expression of V-ATPase protein at the endomembrane of secretory vesicles was observed between normal islet B-cells and insulinoma cells. These findings suggest that the reduced activity of V-ATPase per insulin secretory vesicle in insulinoma cells have a profound effect on the efficiency of proteolytic cleavage of proinsulin.

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September 1997
Volume 11 Issue 3

Print ISSN: 1019-6439
Online ISSN:1791-2423

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Spandidos Publications style
Ohta T, Yamamoto M, Numata M, Iseki S, Kitagawa H, Kayahara M, Nagakawa T, Miwa K, Nakagawa A, Morise T, Morise T, et al: Differential expression of vacuolar-type H+-ATPase between normal human pancreatic islet B-cells and insulinoma cells. Int J Oncol 11: 597-601, 1997.
APA
Ohta, T., Yamamoto, M., Numata, M., Iseki, S., Kitagawa, H., Kayahara, M. ... Terada, T. (1997). Differential expression of vacuolar-type H+-ATPase between normal human pancreatic islet B-cells and insulinoma cells. International Journal of Oncology, 11, 597-601. https://doi.org/10.3892/ijo.11.3.597
MLA
Ohta, T., Yamamoto, M., Numata, M., Iseki, S., Kitagawa, H., Kayahara, M., Nagakawa, T., Miwa, K., Nakagawa, A., Morise, T., Ohkuma, S., Terada, T."Differential expression of vacuolar-type H+-ATPase between normal human pancreatic islet B-cells and insulinoma cells". International Journal of Oncology 11.3 (1997): 597-601.
Chicago
Ohta, T., Yamamoto, M., Numata, M., Iseki, S., Kitagawa, H., Kayahara, M., Nagakawa, T., Miwa, K., Nakagawa, A., Morise, T., Ohkuma, S., Terada, T."Differential expression of vacuolar-type H+-ATPase between normal human pancreatic islet B-cells and insulinoma cells". International Journal of Oncology 11, no. 3 (1997): 597-601. https://doi.org/10.3892/ijo.11.3.597