Cited by 55Ovarian function and disordersDiabetes, Cardiovascular Risks, and LipoproteinsLipid metabolism and biosynthesis

Impaired lipolysis, diminished fat oxidation, and metabolic inflexibility in obese girls with polycystic ovary syndrome

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Kim, Joon Young, Tfayli, Hala, Michaliszyn, Sara F, Arslanian, Silva·2018·The Journal of Clinical Endocrinology & Metabolism

Abstract

Context: Metabolic flexibility reflects the ability to switch from lipid to carbohydrate oxidation during insulin stimulation manifested in increased respiratory quotient (RQ). Little is known about adipose tissue metabolism and metabolic flexibility in adolescent girls with polycystic ovary syndrome (PCOS). Objective: We investigated whole-body lipolysis, substrate oxidation, and metabolic flexibility in obese girls with PCOS vs obese girls without PCOS. Patients/Design: Twenty-one obese girls with PCOS and 21 obese girls without PCOS were pair-matched for age and race. Body composition, abdominal visceral adipose tissue (VAT), sex hormones, lipid profile, and adiponectin were measured. Whole-body lipolysis ([2H5]glycerol turnover), RQ, and substrate oxidation (indirect calorimetry) were evaluated during fasting and a hyperinsulinemic-euglycemic clamp together with assessment of insulin sensitivity (IS). Results: Despite similar body mass index and percent body fat, girls with PCOS vs girls without PCOS had lower fasting lipolysis and fat oxidation, less increase in RQ during hyperinsulinemia with impaired suppression in lipolysis and lipid oxidation, and lower IS. In multiple regression, the best predictors of metabolic flexibility were [using clinical parameters: adiponectin, fasting triglycerides, and insulin (R2 = 0.618, P < 0.0001); using research parameters: IS, VAT, and baseline RQ (R2 = 0.756, P < 0.0001)]. Conclusions: Obese girls with PCOS vs obese girls without PCOS have decreased lipid mobilization, diminished fat oxidation, and metabolic inflexibility. Whether this metabolic phenotype of adipose tissue dysfunction, which is conducive to fat accretion, plays a role in the induction and maintenance of obesity in adolescent girls with PCOS remains to be determined.

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Registry

Crossref · 10.1210/jc.2017-01958

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  • Girls with obesity and PCOS compared with girls with obesity without PCOS demonstrated decreased lipid mobilization, diminished fat oxidation, and impaired ability to switch from lipid to carbohydrate oxidation during insulin stimulation (metabolic inflexibility).

    “Girls with obesity with PCOS compared with those without PCOS demonstrated decreased lipid mobilization, diminished fat oxidation, and impaired ability to switch from lipid to carbohydrate oxidation during insulin stimulation (metabolic inflexibility) [97].”

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Authors
Kim, J. Y., Tfayli, H., Michaliszyn, S. F., & Arslanian, S.
Affiliations
  • University of Pittsburgh (US)
  • American University of Beirut Medical Center (LB)
  • Youngstown State University (US)
  • Children's Hospital of Pittsburgh (US)
Corresponding author
Arslanian, Silva
Venue
The Journal of Clinical Endocrinology & Metabolism
Published
2017-12-06
Volume
103
Issue
2
Pages
546-554
ISSN
  • 0021-972X (ISSN-L)
  • 1945-7197
OpenAlex
W2774478136
Cited by
55
References
40
Citations by year
2026: 4 · 2025: 6 · 2024: 2 · 2023: 8 · 2022: 5 · 2021: 12 · 2020: 7 · 2019: 7 · 2018: 4
FWCI
5.72
Type
journal article
Language
en
Open access
Locations
  • The Journal of Clinical Endocrinology & Metabolism (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute of Child Health and Human Development (K24-HD01357, R01-HD27503)
  • National Center for Advancing Translational Sciences
  • National Center for Research Resources (UL1-RR024153)
Topics
  • Health Sciences › Medicine › Reproductive Medicine › Ovarian function and disorders
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes, Cardiovascular Risks, and Lipoproteins
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Lipid metabolism and biosynthesis
Keywords
polycystic ovary syndrome, adolescent obesity, fat oxidation, metabolic flexibility, respiratory quotient, insulin sensitivity, adiponectin, visceral adipose tissue, substrate oxidation, hyperinsulinemic-euglycemic clamp, adipose tissue dysfunction
MeSH terms
Adolescent, Body Composition, Child, Female, Humans, Insulin Resistance, Lipolysis, Oxidation-Reduction, Polycystic Ovary Syndrome, Case-Control Studies, Abdominal Fat, Lipid Metabolism, Pediatric Obesity

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