The regulation of insulin and glucagon secretion by opiates: A study with naloxone in healthy humans

Alessandro Locatelli, Donatella Spotti, Francesco Caviezel

Research output: Contribution to journalArticlepeer-review

Abstract

The presence of β-endorphin and enkephalin in pancreatic islets suggests that opioid peptides may play a role in the regulation of pancreatic endocrine function. Since data in the literature are rather controversial, we examined the effects of different doses of naloxone on insulin and glucagon secretion in 21 healthy nonobese volunteers (6 women and 15 men) by measuring the variations of insulin and glucagon plasma levels following a 5-g i.v. glucose load before and during a 30-min naloxone infusion. Total amounts of 0.4 and 0.8 mg of naloxone failed to modify serum insulin and plasma glucose responses to glucose challenge. On the contrary, 0.2 mg/kg (i.e. 12-14 mg per subject as total amount) given to 3 women and 6 men led to a glucose-induced insulin release significantly lower than that recorded in basal conditions, with corresponding greater plasma glucose elevation. The suppressive effect of glucose on glucagon concentration was less pronounced during naloxone. Data reported here suggest that inhibition of opiate receptors in human pancreas occurs only with large amounts of naloxone. Moreover, they may indirectly support the stimulatory role of opioid peptides on insulin secretion in man, according to some experimental in vitro and in vivo studies. In addition, naloxone seems to reduce pancreatic A-cell sensitivity to hyperglycemia.

Original languageEnglish
Pages (from-to)25-31
Number of pages7
JournalActa Diabetologica Latina
Volume22
Issue number1
DOIs
Publication statusPublished - Jan 1985

Keywords

  • Endorphin
  • Glucagon
  • Insulin
  • Nalcxone

ASJC Scopus subject areas

  • Internal Medicine
  • Endocrinology, Diabetes and Metabolism
  • Endocrinology

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