Protection by superoxide dismutase, catalase, and poly(ADP-ribose) synthetase inhibitors against alloxan- and streptozotocin-induced islet DNA strand breaks and against the inhibition of proinsulin synthesis

Y. Uchigata, H. Yamamoto, A. Kawamura, H. Okamoto

Research output: Contribution to journalArticle

228 Citations (Scopus)

Abstract

We have shown previously that alloxan and streptozotocin, two major diabetogenic agents, cause DNA strand breaks in rat pancreatic islets and stimulate nuclear poly(ADP-ribose) synthetase, thereby depleting intracellular NAD level and inhibiting proinsulin synthesis. In the present study, superoxide dismutase and catalase, scavengers of radical oxygens, were found to protect against islet DNA strand breaks and inhibition of proinsulin synthesis induced by alloxan. The radical scavengers did not affect islet DNA strand breaks or inhibition of proinsulin synthesis induced by streptozotocin. On the other hand, compounds that inhibit islet nuclear poly(ADP-ribose) synthetase were found to protect against alloxan- as well as streptozotocin-induced inhibition of proinsulin synthesis. The poly(ADP-ribose) synthetase inhibitors were ineffective in protection against DNA strand breaks induced by the agents. These results may provide an important clue for elucidating the prevention of insulin-dependent diabetes as well as for understanding the cause of diabetes.

Original languageEnglish
Pages (from-to)6084-6088
Number of pages5
JournalJournal of Biological Chemistry
Volume257
Issue number11
Publication statusPublished - 1982

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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