Insulin-induced sympathetic activation and vasodilation in skeletal muscle. Effects of insulin resistance in lean subjects

Détails

ID Serval
serval:BIB_34C95D1792C8
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Insulin-induced sympathetic activation and vasodilation in skeletal muscle. Effects of insulin resistance in lean subjects
Périodique
Diabetes
Auteur(s)
Vollenweider  L., Tappy  L., Owlya  R., Jequier  E., Nicod  P., Scherrer  U.
ISSN
0012-1797 (Print)
Statut éditorial
Publié
Date de publication
06/1995
Volume
44
Numéro
6
Pages
641-5
Notes
Journal Article
Research Support, Non-U.S. Gov't --- Old month value: Jun
Résumé
Insulin-induced stimulation of blood flow and sympathetic nerve activity in skeletal muscle tissue is impaired in obesity, but the underlying mechanism is unknown. To determine whether insulin resistance alters sympathetic and vasodilatory responses to euglycemic hyperinsulinemia, in eight healthy subjects we measured calf blood flow and muscle sympathetic nerve activity (MSNA) (n = 5) during insulin/glucose infusion (euglycemic hyperinsulinemic [6 pmol.kg-1.min-1] clamp) performed alone and performed during concomitant fat emulsion infusion, a maneuver designed to induce insulin resistance. The major new finding is that fat emulsion infusion, which attenuated insulin-induced stimulation of carbohydrate oxidation by 39 +/- 7% (P < 0.01), did not have any detectable effect on insulin-induced vasodilatory and sympathetic responses: at the end of the 2-h clamp, blood flow and MSNA had increased by 35 +/- 6% (P < 0.01) and 152 +/- 58% (P < 0.01), respectively, during insulin infusion alone and by 35 +/- 7% (P < 0.01) and 244 +/- 90% (P < 0.01), respectively, during insulin infusion superimposed on free fatty acid infusion. These observations in lean healthy subjects indicate that induction of resistance to the stimulatory effects of insulin on carbohydrate metabolism does not attenuate muscle blood flow and MSNA responses evoked by acute euglycemic hyperinsulinemia. These findings provide further evidence that hyperinsulinemia per se is the primary stimulus that triggers stimulation of muscle blood flow and MSNA during insulin/glucose infusion in humans and suggest that the impaired insulin-induced vasodilation in obese subjects is not related primarily to impaired stimulation of muscle carbohydrate metabolism.
Mots-clé
Adult Blood Glucose/analysis Fatty Acids, Nonesterified/pharmacology Glucose Clamp Technique Hemodynamic Processes/drug effects/physiology Humans Insulin/pharmacology/physiology Insulin Resistance/*physiology Muscles/blood supply/drug effects/innervation/*physiology Sympathetic Nervous System/drug effects/*physiology Vasodilation/drug effects/*physiology
Pubmed
Web of science
Création de la notice
24/01/2008 14:36
Dernière modification de la notice
20/08/2019 14:21
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