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Neurotransmitter-induced inhibition of exocytosis in insulin-secreting beta cells by activation of calcineurin

Author:
  • Erik Renström
  • Wei-Guang Ding
  • Krister Bokvist
  • Patrik Rorsman
Publishing year: 1996
Language: English
Pages: 513-522
Publication/Series: Neuron
Volume: 17
Issue: 3
Document type: Journal article
Publisher: Cell Press

Abstract english

Neurotransmitters and hormones such as somatostatin, galanin, and adrenalin reduce insulin secretion. Their inhibitory action involves direct interference with the exocytotic machinery. We have examined the molecular processes underlying this effect using high resolution measurements of cell capacitance. Suppression of exocytosis was maximal at concentrations that did not cause complete inhibition of glucose-stimulated electrical activity. This action was dependent on activation of G proteins but was not associated with inhibition of the voltage-dependent Ca2+ currents or adenylate cyclase activity. The molecular processes initiated by the agonists culminate in the activation of the Ca(2+)-dependent protein phosphatase calcineurin, and suppression of the activity of this enzyme abolishes their action on exocytosis. We propose that mechanisms similar to those we report here may contribute to adrenergic and peptidergic inhibition of secretion in other neuroendocrine cells and in nerve terminals.

Keywords

  • Neurosciences

Other

Published
  • ISSN: 0896-6273
Erik Renström
E-mail: erik.renstrom [at] med.lu.se

Deputy head of department

Department of Clinical Sciences, Malmö

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Principal investigator

Islet patophysiology

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