Does free fatty acid infusion impair insulin action also through an increase in oxidative stress? (original) (raw)

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1Department of Geriatric Medicine and Metabolic Diseases, II University of Naples, Italy.

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1Department of Geriatric Medicine and Metabolic Diseases, II University of Naples, Italy.

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1Department of Geriatric Medicine and Metabolic Diseases, II University of Naples, Italy.

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1Department of Geriatric Medicine and Metabolic Diseases, II University of Naples, Italy.

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1Department of Geriatric Medicine and Metabolic Diseases, II University of Naples, Italy.

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1Department of Geriatric Medicine and Metabolic Diseases, II University of Naples, Italy.

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1Department of Geriatric Medicine and Metabolic Diseases, II University of Naples, Italy.

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1Department of Geriatric Medicine and Metabolic Diseases, II University of Naples, Italy.

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Published:

01 December 1996

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G Paolisso, A Gambardella, M R Tagliamonte, F Saccomanno, T Salvatore, P Gualdiero, M V D'Onofrio, B V Howard, Does free fatty acid infusion impair insulin action also through an increase in oxidative stress?, The Journal of Clinical Endocrinology & Metabolism, Volume 81, Issue 12, 1 December 1996, Pages 4244–4248, https://doi.org/10.1210/jcem.81.12.8954022
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Abstract

In vitro studies have demonstrated that free fatty acids (FFA) may enhance oxidative stress. In contrast, no in vivo studies have addressed such a relationship. This four-part study aims at investigating the association between FFA and oxidative stress in healthy volunteers. The following experimental procedures were carried out: 1) determination and simple correlations among fasting plasma FFA, glucose, insulin, plasma thiobarbituric acid-reactive substance (TBARS), the ratio of reduced glutathione (GSH) to oxidized GSH, and lipid hydroperoxide (n = 30); 2) time-dependent effect of FFA on plasma TBARS concentrations and GSH/oxidized GSH ratio (n = 10); 3) dose-dependent effect of FFA on plasma TBARS concentrations (n = 9); and 4) relationship among plasma FFA concentrations, plasma TBARS concentrations, and insulin action (n = 11). The results demonstrate that fasting plasma FFA concentrations correlated with fasting plasma TBARS concentrations (r = 0.65; P < 0.001) and lipid hydroperoxide (r = 0.79; P < 0.001). The correlation between plasma FFA and TBARS remained significant even after adjustment for age, sex, body mass index, and fasting and 2-h plasma glucose concentrations (r = 0.43; P < 0.01). In the time-dependent study, plasma TBARS concentrations increased with the rise in plasma FFA concentrations. In the dose-response study, a progressive increase in fasting plasma FFA concentrations was achieved by varying the Intralipid infusion rate, which also caused plasma TBARS concentrations to increase progressively until they reached a plateau between the last two infusion rates (0.3 and 0.4 mL/min). A euglycemic hyperinsulinemic glucose clamp (insulin infusion rate, 10.2 pmol/kg min for 360 min) was also performed. Simultaneous 10% Intralipid (0.4 mL/min) infusion significantly enhanced plasma TBARS concentrations and inhibited insulin-stimulated whole body glucose disposal (WBGD). GSH infusion (15 mg/min for 360 min) had opposite effects on plasma TBARS concentrations and WBGD. A combined infusion of 10% Intralipid and GSH was associated with a stimulation of WBGD with a magnitude midway between that of 10% Intralipid and GSH infused separately. In conclusion, fasting plasma FFA seems to enhances oxidative stress, which might contribute to the disruptive effects of plasma FFA on insulin-mediated glucose uptake.

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Copyright © 1996 by The Endocrine Society

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