Abdominal adipocyte populations in women with visceral obesity.

TitleAbdominal adipocyte populations in women with visceral obesity.
Publication TypeJournal Article
Year of Publication2016
AuteursMichaud, A, Laforest, S, Pelletier, M, Nadeau, M, Simard, S, Daris, M, Lebœuf, M, Vidal, H, Géloën, A, Tchernof, A
JournalEur J Endocrinol
Date Published2016 Feb
KeywordsAdipocytes, Adult, Female, Humans, Intra-Abdominal Fat, Middle Aged, Obesity, Abdominal, Radiography, Subcutaneous Fat, Abdominal

BACKGROUND: Visceral obesity is independently related to numerous cardiometabolic alterations, with adipose tissue dysfunction as a central feature.OBJECTIVE: To examine whether omental (OM) and subcutaneous (SC) adipocyte size populations in women relate to visceral obesity, cardiometabolic risk factors and adipocyte lipolysis independent of total adiposity.DESIGN AND METHODS: OM and SC fat samples were obtained during gynecological surgery in 60 women (mean age, 46.1±5.9 years; mean BMI, 27.1±4.5 kg/m² (range, 20.3-41.  kg/m²)). Fresh samples were treated with osmium tetroxide and were analyzed with a Multisizer Coulter. Cell size distributions were computed for each sample with exponential and Gaussian function fits.RESULTS: Computed tomography-measured visceral fat accumulation was the best predictor of larger cell populations as well as the percentage of small cells in both OM and SC fat (P<0.0001 for all). Accordingly, women with visceral obesity had larger cells in the main population and higher proportion of small adipocytes independent of total adiposity (P≤0.05). Using linear regression analysis, we found that women characterized by larger-than-predicted adipocytes in either OM or SC adipose tissue presented higher visceral adipose tissue area, increased percentage of small cells and homeostasis model assessment insulin resistance index as well as higher OM adipocyte isoproterenol-, forskolin- and dbcAMP-stimulated lipolysis compared to women with smaller-than-predicted adipocytes, independent of total adiposity (P≤0.05).CONCLUSION: Excess visceral adipose tissue accumulation is a strong marker of both adipocyte hypertrophy and increased number of small cells in either fat compartment, which relates to higher insulin resistance index and lipolytic response, independent of total adiposity.

Alternate JournalEur. J. Endocrinol.
PubMed ID26578637
Grant ListMOP-102642 / / Canadian Institutes of Health Research / Canada