Central apelin controls glucose homeostasis via a nitric oxide-dependent pathway in mice

Thibaut Duparc, André Colom, Patrice D. Cani, Nicolas Massaly, Sophie Rastrelli, Anne Drougard, Sophie Le Gonidec, Lionel Moulédous, Bernard Frances, Isabelle Leclercq, Catherine Llorens-Cortes, J. Andrew Pospisilik, Nathalie M. Delzenne, Philippe Valet, Isabelle Castan-Laurell, Claude Knauf

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

Aims: Apelin and its receptor have emerged as promising targets for the treatment of insulin resistance. Indeed, peripheral administration of apelin stimulates glucose utilization and insulin sensitivity via a nitric oxide (NO) pathway. In addition to being expressed on peripheral metabolically active adipose tissues, apelin is also found in the brain. However, no data are available on the role of central effects of apelin on metabolic control. We studied glucose metabolism in response to acute and chronic intracerebroventricular (i.c.v.) injection of apelin performed in normal and obese/diabetic mice. Results: We demonstrate that i.c.v. injection of apelin into fed mice improves glucose control via NO-dependent mechanisms. These results have been strengthened by transgenic (eNOS-KO mice), pharmacological (L-NMMA i.c.v. treated mice), and real-time measurement of NO release with amperometric probes detection. High-fat diet-fed mice displayed a severely blunted response to i.c.v. apelin associated with a lack of NO response by the hypothalamus. Moreover, central administration of high dose apelin in fasted normal mice provoked hyperinsulinemia, hyperglycemia, glucose intolerance, and insulin resistance. Conclusion: These data provide compelling evidence that central apelin participates in the regulation of glucose homeostasis and suggest a novel pathophysiological mechanism involved in the transition from normal to diabetic state.

Original languageEnglish
Pages (from-to)1477-1496
Number of pages20
JournalAntioxidants and Redox Signaling
Volume15
Issue number6
DOIs
StatePublished - Sep 15 2011

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