Acute hyperinsulinemia and reduced plasma free fatty acid levels decrease intramuscular triglyceride synthesis

Xiao Jun Zhang, Lijian Wang, Demidmaa Tuvdendorj, Zhanpin Wu, Noe A. Rodriguez, David Herndon, Robert R. Wolfe

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Objective: To investigate the effect of acute hyperinsulinemia and the resulting decrease in plasma free fatty acid (FFA) concentrations on intramuscular TG synthesis. Materials/Methods: U-13C 16-palmitate was infused for 3 h in anesthetized rabbits after overnight food deprivation. Arterial blood and leg muscle were sampled during the tracer infusion. Plasma samples were analyzed for free and TG-bound palmitate enrichments and concentrations. The enrichments and concentrations of palmitoyl-CoA and palmitoyl-carnitine as well as the enrichment of palmitate bound to TG were measured in muscle samples. Fractional synthetic rate (FSR) of intramuscular TG was calculated using the tracer incorporation method. The rabbits were divided into a control group and a hyperinsulinemic euglycemic clamp group. Insulin infusion decreased the rate of appearance of plasma free palmitate (2.00 ± 0.15 vs 0.68 ± 0.20 μmol kg- 1 min- 1; P <.001), decreased plasma FFA concentration (327 ± 61 vs 72 ± 25 nmol/mL; P <.01), decreased the total concentration of intramuscular fatty acyl-CoA plus fatty acyl-carnitine (12.1 ± 1.6 vs 7.0 ± 0.7 nmol/g; P <.05), and decreased intramuscular TG FSR (0.48 ± 0.05 vs 0.21 ± 0.06%/h; P <.01) in comparison with the control group. Intramuscular TG FSR was correlated (P <.01) with both plasma FFA concentrations and intramuscular fatty acyl-CoA concentrations. Conclusions: Fatty acid availability is a determinant of intramuscular TG synthesis. Insulin infusion decreases plasma and intramuscular fatty acid availability and thereby decreases TG synthesis.

Original languageEnglish (US)
Pages (from-to)44-51
Number of pages8
JournalMetabolism: Clinical and Experimental
Volume62
Issue number1
DOIs
StatePublished - Jan 2013

Fingerprint

Hyperinsulinism
Nonesterified Fatty Acids
Triglycerides
Palmitates
Acyl Coenzyme A
Carnitine
Fatty Acids
Insulin
Palmitoyl Coenzyme A
Rabbits
Food Deprivation
Muscles
Control Groups
Glucose Clamp Technique
Leg

Keywords

  • Fatty acyl-carnitine
  • Fatty acyl-CoA
  • Stable isotopes

ASJC Scopus subject areas

  • Endocrinology
  • Endocrinology, Diabetes and Metabolism

Cite this

Acute hyperinsulinemia and reduced plasma free fatty acid levels decrease intramuscular triglyceride synthesis. / Zhang, Xiao Jun; Wang, Lijian; Tuvdendorj, Demidmaa; Wu, Zhanpin; Rodriguez, Noe A.; Herndon, David; Wolfe, Robert R.

In: Metabolism: Clinical and Experimental, Vol. 62, No. 1, 01.2013, p. 44-51.

Research output: Contribution to journalArticle

Zhang, Xiao Jun ; Wang, Lijian ; Tuvdendorj, Demidmaa ; Wu, Zhanpin ; Rodriguez, Noe A. ; Herndon, David ; Wolfe, Robert R. / Acute hyperinsulinemia and reduced plasma free fatty acid levels decrease intramuscular triglyceride synthesis. In: Metabolism: Clinical and Experimental. 2013 ; Vol. 62, No. 1. pp. 44-51.
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abstract = "Objective: To investigate the effect of acute hyperinsulinemia and the resulting decrease in plasma free fatty acid (FFA) concentrations on intramuscular TG synthesis. Materials/Methods: U-13C 16-palmitate was infused for 3 h in anesthetized rabbits after overnight food deprivation. Arterial blood and leg muscle were sampled during the tracer infusion. Plasma samples were analyzed for free and TG-bound palmitate enrichments and concentrations. The enrichments and concentrations of palmitoyl-CoA and palmitoyl-carnitine as well as the enrichment of palmitate bound to TG were measured in muscle samples. Fractional synthetic rate (FSR) of intramuscular TG was calculated using the tracer incorporation method. The rabbits were divided into a control group and a hyperinsulinemic euglycemic clamp group. Insulin infusion decreased the rate of appearance of plasma free palmitate (2.00 ± 0.15 vs 0.68 ± 0.20 μmol kg- 1 min- 1; P <.001), decreased plasma FFA concentration (327 ± 61 vs 72 ± 25 nmol/mL; P <.01), decreased the total concentration of intramuscular fatty acyl-CoA plus fatty acyl-carnitine (12.1 ± 1.6 vs 7.0 ± 0.7 nmol/g; P <.05), and decreased intramuscular TG FSR (0.48 ± 0.05 vs 0.21 ± 0.06{\%}/h; P <.01) in comparison with the control group. Intramuscular TG FSR was correlated (P <.01) with both plasma FFA concentrations and intramuscular fatty acyl-CoA concentrations. Conclusions: Fatty acid availability is a determinant of intramuscular TG synthesis. Insulin infusion decreases plasma and intramuscular fatty acid availability and thereby decreases TG synthesis.",
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AU - Herndon, David

AU - Wolfe, Robert R.

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AB - Objective: To investigate the effect of acute hyperinsulinemia and the resulting decrease in plasma free fatty acid (FFA) concentrations on intramuscular TG synthesis. Materials/Methods: U-13C 16-palmitate was infused for 3 h in anesthetized rabbits after overnight food deprivation. Arterial blood and leg muscle were sampled during the tracer infusion. Plasma samples were analyzed for free and TG-bound palmitate enrichments and concentrations. The enrichments and concentrations of palmitoyl-CoA and palmitoyl-carnitine as well as the enrichment of palmitate bound to TG were measured in muscle samples. Fractional synthetic rate (FSR) of intramuscular TG was calculated using the tracer incorporation method. The rabbits were divided into a control group and a hyperinsulinemic euglycemic clamp group. Insulin infusion decreased the rate of appearance of plasma free palmitate (2.00 ± 0.15 vs 0.68 ± 0.20 μmol kg- 1 min- 1; P <.001), decreased plasma FFA concentration (327 ± 61 vs 72 ± 25 nmol/mL; P <.01), decreased the total concentration of intramuscular fatty acyl-CoA plus fatty acyl-carnitine (12.1 ± 1.6 vs 7.0 ± 0.7 nmol/g; P <.05), and decreased intramuscular TG FSR (0.48 ± 0.05 vs 0.21 ± 0.06%/h; P <.01) in comparison with the control group. Intramuscular TG FSR was correlated (P <.01) with both plasma FFA concentrations and intramuscular fatty acyl-CoA concentrations. Conclusions: Fatty acid availability is a determinant of intramuscular TG synthesis. Insulin infusion decreases plasma and intramuscular fatty acid availability and thereby decreases TG synthesis.

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