Distinguishing characteristics of metabolically healthy versus metabolically unhealthy obese adolescent girls with polycystic ovary syndrome

Capsule:
Among obese girls with polycystic ovary syndrome, 27% who are metabolically healthy have a more favorable risk profile for type 2 diabetes, atherogenesis, inflammation, and androgenemia compared with the 73% who are metabolically unhealthy.

Authors:
Joon Young Kim, Ph.D., Hala Tfayli, M.D., Sara F. Michaliszyn, Ph.D., Sojung Lee, Ph.D., Silva Arslanian, M.D.

Volume 105, Issue 6, Pages 1603-1611

Abstract:

Objective:
To investigate the key physical, metabolic, hormonal and cardiovascular characteristics of metabolically healthy obese (MHO) versus unhealthy obese (MUHO) girls with polycystic ovary syndrome (PCOS).

Design:
Cross-sectional study.

Setting:
Research center.

Patient(s):
Seventy obese girls with PCOS were divided into 19 MHO and 51 MUHO based on cutoff points for in vivo insulin sensitivity (≤2 and >2 SDs of that of normal-weight girls’ values, respectively).

Intervention(s):
None.

Main Outcome Measure(s):
Body composition, abdominal fat, in vivo insulin sensitivity and secretion (hyperinsulinemic-euglycemic and hyperglycemic clamps respectively), hormonal profile, and cardiovascular disease risk markers.

Result(s):
MUHO-PCOS girls had higher waist circumference, visceral adipose tissue, leptin, and free testosterone, lower SHBG and E2, higher non–high-density lipoprotein (HDL) cholesterol and atherogenic lipoprotein particle concentrations, smaller HDL particle size, and higher high-sensitivity C-reactive protein compared with MHO-PCOS girls. Hepatic and peripheral insulin sensitivity were lower with higher first- and second-phase insulin secretion, but β-cell function relative to insulin sensitivity was lower in MUHO versus MHO. Pair matching of MHO and MUHO regarding age and body mass index revealed similar findings. MUHO-PCOS girls had larger visceral adiposity, lower insulin sensitivity and β-cell function, worse hormonal profile, and severely atherogenic lipoprotein concentrations compared with MHO-PCOS girls.

Conclusion(s):
MHO-PCOS girls have favorable physical, metabolic, hormonal, and cardiovascular disease (CVD) characteristics and lower risk biomarkers for type 2 diabetes compared with their MUHO-PCOS peers. A greater understanding of the contrast in this risk phenotype in obese girls with PCOS may have important implications for therapeutic interventions, their outcomes, and their durability.

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