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Citations to this article

Lipid infusion lowers sympathetic nervous activity and leads to increased β-cell responsiveness to glucose
Christophe Magnan, … , Alain Ktorza, Françoise Assimacopoulos-Jeannet
Christophe Magnan, … , Alain Ktorza, Françoise Assimacopoulos-Jeannet
Published February 1, 1999
Citation Information: J Clin Invest. 1999;103(3):413-419. https://doi.org/10.1172/JCI3883.
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Article

Lipid infusion lowers sympathetic nervous activity and leads to increased β-cell responsiveness to glucose

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Abstract

We investigated the possible involvement of the autonomic nervous system in the effect of a long-term elevation of plasma free fatty acid (FFA) concentration on glucose-induced insulin secretion (GIIS) in rats. Rats were infused with an emulsion of triglycerides (Intralipid) for 48 hours (IL rats). This resulted in a twofold increase in plasma FFA concentration. At the end of infusion, GIIS as reflected in the insulinogenic index (ΔI/ΔG) was 2.5-fold greater in IL rats compared with control saline-infused rats. The ratio of sympathetic to parasympathetic nervous activities was sharply decreased in IL rats relative to controls. GIIS was studied in the presence of increasing amounts of α- and β-adrenoreceptor agonists and antagonists. The lowest concentrations of the α2A-adrenoreceptor agonist oxymetazoline, which were ineffective in control rats, reduced GIIS in IL rats. At the dose of 0.3 pmol/kg, GIIS became similar in IL and control rats. The use of β-adrenoreceptor agonist (isoproterenol) or antagonist (propranolol) did not result in a significant alteration in GIIS in both groups. GIIS remained as high in IL vagotomized rats as in intact IL rats, indicating that changes in parasympathetic tone were of minor importance. Altogether, the data show that lipid infusion provokes β-cell hyperresponsiveness in vivo, at least in part through changes in α2-adrenergic innervation.

Authors

Christophe Magnan, Stephan Collins, Marie-France Berthault, Nadim Kassis, Mylène Vincent, Marc Gilbert, Luc Pénicaud, Alain Ktorza, Françoise Assimacopoulos-Jeannet

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Year: 2022 2021 2020 2019 2016 2015 2014 2013 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1985 Total
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Citations to this article (73)

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