Effect of β2-adrenergic receptor polymorphisms on epinephrine and exercise-stimulated lipolysis in humans

Shichun Du, Michael J. Joyner, Timothy B. Curry, John H. Eisenach, Christopher P. Johnson, William G. Schrage, Michael D. Jensen

Research output: Contribution to journalArticlepeer-review

Abstract

The β2-adrenergic system is an important regulator of human adipose tissue lipolysis. Polymorphisms that result in amino acid substitutions in the β2-adrenergic receptor have been reported to alter lipolysis. We hypothesized that variations in the amino acid at position 16 of the β2-adrenergic receptor would result in different lipolytic responses to intravenous epinephrine and exercise. 17 volunteers homozygous for glycine at position 16 (Gly/Gly, nine female) and 16 volunteers homozygous for arginine at position 16 (Arg/Arg, eight female) of the β2-adrenergic receptor participated in this study. On one study day participants received infusions of epinephrine at submaximal (5 ng kg-1 min-1) and maximal (40 ng kg-1 min-1) lipolytic doses. The other study day volunteers bicycled for 90 min at 50-60% of maximum oxygen consumption (VO2max). [9,10-3H] Palmitate was infused both days to measure free fatty acid-palmitate kinetics. Oxygen consumption was measured using indirect calorimetry. Palmitate release rates in response to epinephrine and exercise were not different in the Gly/Gly and Arg/Arg participants. The only statistically significant difference we observed was a lesser ΔVO2 in Arg/Arg volunteers in response to the submaximal epinephrine infusion. The polymorphisms resulting in Arg/Arg and Gly/Gly at position 16 of the β2-adrenergic receptor do not result in clinically meaningful differences in lipolysis responses to epinephrine or submaximal exercise.

Original languageEnglish (US)
Article numbere12017
JournalPhysiological reports
Volume2
Issue number5
DOIs
StatePublished - 2014

Keywords

  • Body composition
  • Indirect calorimetry
  • Oxygen consumption
  • Palmitate kinetics

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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