Regulation of lipolysis and lipoprotein lipase after weight loss in obese, postmenopausal women

Dora Berman-Weinberg, Barbara J. Nicklas, Alice S. Ryan, Ellen M. Rogus, Karen E. Dennis, Andrew P. Goldberg

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

Objective: To test the hypothesis that the greater β-adrenoceptor (β-AR)-stimulated lipolysis and sensitivity (half-maximal lipolytic response) in abdominal (ABD) adipocytes, greater gluteal (GLT) adipose tissue-lipoprotein lipase (AT-LPL) activity, and dyslipidemia associated with obesity in older women are modifiable by weight loss (WL) and are not due to menopause or aging. Research Methods and Procedures: The metabolic effects of 6 months of hypocaloric diet and low-intensity walking WL program on the regional regulation of in vitro lipolysis and AT-LPL activity in subcutaneous ABD and GLT adipocytes were measured in 34 obese (48.7 ± 0.7% body fat, mean ± SE) postmenopausal (59 ± 1 years) white women. Results: The lipolytic responsiveness to the β-AR agonist isoproterenol and basal lipolysis in the presence of 1 U/mL adenosine deaminase-uninhibited (lipolysis) were greater (p < 0.01) in ABD than GLT adipocytes before and after WL, but there were no regional differences in postreceptor (dibutyryl 3′,5′-cyclic adenosine monophosphate)-stimulated lipolysis. β-AR sensitivity was greater in ABD than GLT adipocytes before (p < 0.01) but not after WL. Regional AT-LPL did not change after WL, but the change in the activity of ABD (but not GLT) AT-LPL correlated with the baseline adenosine deaminase-uninhibited lipolysis (r = 0.38, p = 0.03). There were no relationships between the declines in plasma triglyceride or increases in high-density lipoprotein cholesterol associated with WL and the changes in regional fat cell metabolism. Discussion: Thus, despite improving lipoprotein lipid profiles in obese, postmenopausal women, WL does not affect the regulation of regional fat metabolism, and a greater tonic inhibition of basal lipolysis by endogenous adenosine may increase the activity of AT-LPL after WL and predispose older women to develop ABD adiposity.

Original languageEnglish
Pages (from-to)32-39
Number of pages8
JournalObesity Research
Volume12
Issue number1
StatePublished - Dec 1 2004

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Keywords

  • Adenosine
  • Central obesity
  • Fat metabolism
  • Hypocaloric diet
  • Menopause

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Public Health, Environmental and Occupational Health
  • Endocrinology
  • Food Science
  • Endocrinology, Diabetes and Metabolism

Cite this

Berman-Weinberg, D., Nicklas, B. J., Ryan, A. S., Rogus, E. M., Dennis, K. E., & Goldberg, A. P. (2004). Regulation of lipolysis and lipoprotein lipase after weight loss in obese, postmenopausal women. Obesity Research, 12(1), 32-39.