Adrenergically and non-adrenergically mediated human adipose tissue lipolysis during acute exercise and exercise training

Kenneth Verboven, Rudi Stinkens, Dominique Hansen, Inez Wens, Ines Frederix, Bert O. Eijnde, Johan W. E. Jocken, Gijs H. Goossens, Ellen E. Blaak*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Web of Science)

Abstract

Obesity-related adipose tissue (AT) dysfunction, in particular subcutaneous AT (SCAT) lipolysis, is characterized by catecholamine resistance and impaired atrial natriuretic peptide (ANP) responsiveness. It remains unknown whether exercise training improves (non-)adrenergically mediated lipolysis in metabolically compromised conditions. We investigated the effects of local combined alpha-/beta-adrenoceptor blockade on abdominal SCAT lipolysis in lean insulin sensitive (IS) (n = 10), obese IS (n = 10), and obese insulin resistant (IR) (n = 10) men. Obese men participated in a 12-week exercise training intervention to determine the effects on SCAT lipolysis. Abdominal SCAT extracellular glycerol concentration and blood flow (ATBF) were investigated using microdialysis, with/without locally combined alpha-/beta-adrenoceptor blockade at rest, during low-intensity endurance-type exercise and post-exercise recovery. In obese IR men, microdialysis was repeated after exercise intervention. The exercise-induced increase in SCAT extracellular glycerol was more pronounced in obese IS compared with lean IS men, possibly resulting from lower ATBF in obese IS men. The exercise-induced increase in extracellular glycerol was blunted in obese IR compared with obese IS men, despite comparable local ATBF. Abdominal SCAT extracellular glycerol was markedly reduced (remaining similar to 60% of exercise-induced SCAT extracellular glycerol) following the local alpha-/beta-adrenoceptor blockade in obese IS but not in IR men, suggesting reduced catecholamine mediated lipolysis during exercise in obese IR men. Exercise training did not affect (non-) adrenergically mediated lipolysis in obese IR men. Our findings showed a major contribution of non-adrenergically-mediated lipolysis during exercise in male abdominal SCAT. Furthermore, catecholamine mediated lipolysis may be blunted during exercise in obese IR men but could not be improved by exercise intervention, despite an improved metabolic profile and body composition.

Original languageEnglish
Pages (from-to)1685-1698
Number of pages14
JournalClinical Science
Volume132
Issue number15
DOIs
Publication statusPublished - 16 Aug 2018

Keywords

  • ATRIAL-NATRIURETIC-PEPTIDE
  • TYPE-2 DIABETIC MEN
  • INSULIN-RESISTANCE
  • SKELETAL-MUSCLE
  • OBESE SUBJECTS
  • LIPID MOBILIZATION
  • GLUCOSE-TOLERANCE
  • OVERWEIGHT MEN
  • NORMAL-WEIGHT
  • CELL FUNCTION

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