Hypoglycemia-associated autonomic failure is prevented by opioid receptor blockade

James Leu, Min Hui Cui, Harry Shamoon, Ilan Gabriely

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Context: Repeated hypoglycemia is associated with hypoglycemia-associated autonomic failure (HAAF), a syndrome of defective counterregulation. Objective: HAAF increases the risk of severe hypoglycemia in diabetes, although its mechanism remains unresolved. Because β-endorphin influences the autonomic response to hypoglycemia via opioid receptor activation, we hypothesized that it is also involved in the pathogenesis of HAAF. Research Design and Methods: We asked whether opioid receptor blockade during antecedent hypoglycemia (60 mg/dl) on d 1 would prevent development of HAAF on d 2 in eight nondiabetic subjects (five males, 3 females; age, 28 ± 3.5 yr; body mass index, 24.2 ± 2.1 kg/m2). On four occasions, d 1 was: 1) two 90-min hypoglycemic clamps (N-); 2) two 90-min hypoglycemic clamps plus naloxone (N+); 3) two euglycemic 90-min clamps (C); or 4) two euglycemic 90-min clamps plus naloxone (C+). Results: Day 1 hypoglycemia caused marked deterioration of d 2 hormonal responses to hypoglycemia, consistent with HAAF - i.e. decreased plasma epinephrine, norepinephrine, and glucagon compared to control (C) (374 ± 71 vs. 810 ± 94, 307 ± 65 vs. 686 ± 98, and 71 ± 9 vs. 93 ± 4 pg/ml, respectively, P < 0.01), as well as in endogenous glucose production (24 vs. 163%; P < 0.01). In contrast, naloxone on d 1 completely prevented the defective counterregulatory responses; epinephrine, norepinephrine, and glucagon (852 ± 82, 769 ± 77, and 98 ± 7 pg/ml) and endogenous glucose production recovery (167%) were identical to those after d 1 euglycemia (P < NS for all). Infusion of naloxone alone during euglycemia on d 1 (C+) had no effect on d 2 responses. Conclusions: These data suggest that the opioid signaling system is a promising target for further studies to prevent HAAF.

Original languageEnglish (US)
Pages (from-to)3372-3380
Number of pages9
JournalJournal of Clinical Endocrinology and Metabolism
Volume94
Issue number9
DOIs
StatePublished - Sep 2009

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Biochemistry
  • Endocrinology
  • Clinical Biochemistry
  • Biochemistry, medical

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