CD38 disruption impairs glucose-induced increases in cyclic ADP-ribose, [Ca2+](i), and insulin secretion

Ichiro Kato, Yasuhiko Yamamoto, Miki Fujimura, Naoya Noguchi, Shin Takasawa, Hiroshi Okamoto

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168 Citations (Scopus)

Abstract

Increases in [Ca2+](i) in pancreatic beta cells, resulting from Ca2+ mobilization from intracellular stores as well as Ca2+ influx from extracellular sources, are important in insulin secretion by glucose. Cyclic ADP-ribose (cADPR), accumulated in beta cells by glucose stimulation, has been postulated to serve as a second messenger for intracellular Ca2+ mobilization for insulin secretion, and CD38 is thought to be involved in the cADPR accumulation (Takasawa, S., Tohgo, A., Noguchi, N., Koguma, T., Nata, K., Sugimoto, T., Yonekura, H., and Okamoto, H. (1993) J. Biol. Chem. 268, 26052-26054). Here we created 'knockout' (CD38(-/-)) mice by homologous recombination. CD38(-/-) mice developed normally but showed no increase in their glucose-induced production of cADPR in pancreatic islets. The glucose- induced [Ca2+](i) rise and insulin secretion were both severely impaired in CD38(-/-) islets, whereas CD38(-/-) islets responded normally to the extracellular Ca2+ influx stimulants tolbutamide and KCl. CD38(-/-) mice showed impaired glucose tolerance, and the serum insulin level was lower than control, and these impaired phenotypes were rescued by beta cell-specific expression of CD38 cDNA. These results indicate that CD38 plays an essential role in intracellular Ca2+ mobilization by cADPR for insulin secretion.

Original languageEnglish
Pages (from-to)1869-1872
Number of pages4
JournalJournal of Biological Chemistry
Volume274
Issue number4
DOIs
Publication statusPublished - 1999 Jan 22

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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