Different effects of 5α-dihydrotestosterone treatment on hepatic and visceral adipose tissue inflammation in animal model of polycystic ovary syndrome

AbstractPolycystic ovary syndrome is a heterogeneous endocrine and metabolic disorder associated with abdominal obesity, dyslipidemia and insulin resistance. Since abdominal obesity is characterized by low-grade inflammation, the aim of the study was to investigate whether visceral adipose tissue inflammation linked to abdominal obesity and dyslipidemia could lead to impaired insulin sensitivity in the animal model of polycystic ovary syndrome.Female Wistar rats were treated with nonaromatizable 5α-dihydrotestosterone pellets in order to induce reproductive and metabolic characteristics of polycystic ovary syndrome. Glucose, triglycerides, non-esterified fatty acids and insulin were determined in blood plasma. Visceral adipose tissue inflammation was evaluated by the nuclear factor kappa B intracellular distribution, macrophage migration inhibitory factor protein level, as well as TNFα, IL6 and IL1β mRNA levels. Insulin sensitivity was assessed by intraperitoneal glucose tolerance test and homeostasis model assessment index, and through analysis of insulin signaling pathway in the visceral adipose tissue.Dihydrotestosterone treatment led to increased body weight, abdominal obesity and elevated triglycerides and non-esterified fatty acids, which were accompanied by the activation of nuclear factor kappa B and increase in macrophage migration inhibitory factor, IL6 and IL1β levels in the visceral adipose tissue. In parallel, insulin sensitivity was affected in 5α-dihydrotestosterone-treated animals only at the systemic and not at the level of visceral adipose tissue.The results showed that abdominal obesity and dyslipidemia in the animal model of polycystic ovary syndrome were accompanied with low-grade inflammation in the visceral adipose tissue. However, these metabolic disturbances did not result in decreased tissue insulin sensitivity.

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Indirect Predictors of Visceral Adipose Tissue in Women with Polycystic Ovary Syndrome: A Comparison of Methods

Nutrients ◽

10.3390/nu13082494 ◽

2021 ◽

Vol 13 (8) ◽

pp. 2494

Author(s):

Małgorzata Kałużna ◽

Magdalena Czlapka-Matyasik ◽

Aleksandra Bykowska-Derda ◽

Jerzy Moczko ◽

Marek Ruchala ◽

...

Keyword(s):

Adipose Tissue ◽

Polycystic Ovary Syndrome ◽

Visceral Adipose Tissue ◽

Polycystic Ovary ◽

Age Groups ◽

Ovary Syndrome ◽

Women Subjects ◽

Pcos Group ◽

Total Body ◽

Visceral Adipose

Visceral adipose tissue (VAT) accumulation, is a part of a polycystic ovary syndrome (PCOS) phenotype. Dual-energy x-ray absorptiometry (DXA) provides a gold standard measurement of VAT. This study aimed to compare ten different indirect methods of VAT estimation in PCOS women. The study included 154 PCOS and 68 age- and BMI-matched control women. Subjects were divided into age groups: 18–30 y.o. and 30–40 y.o. Analysis included: body mass index (BMI), waist circumference (WC), waist-to-hip ratio (WHR), waist-to-height ratio (WHtR), waist/height 0.5 (WHT.5R), visceral adipose index (VAI), lipid accumulation product (LAP), and fat mass index (FMI). VAT accumulation, android-to-gynoid ratio (A/G), and total body fat (TBF) was measured by DXA. ROC analysis revealed that WHtR, WHT.5R, WC, BMI, and LAP demonstrated the highest predictive value in identifying VAT in the PCOS group. Lower cut-off values of BMI (23.43 kg/m2) and WHtR (0.45) were determined in the younger PCOS group and higher thresholds of WHtR (0.52) in the older PCOS group than commonly used. Measuring either: WHtR, WHT.5R, WC, BMI, or LAP, could help identify a subgroup of PCOS patients at high cardiometabolic risk. The current observations reinforce the importance of using special cut-offs to identify VAT, dependent on age and PCOS presence.

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No difference in markers of adipose tissue inflammation between overweight women with polycystic ovary syndrome and weight-matched controls

Human Reproduction ◽

10.1093/humrep/der096 ◽

2011 ◽

Vol 26 (6) ◽

pp. 1478-1485 ◽

Cited By ~ 26

Author(s):

A. Lindholm ◽

C. Blomquist ◽

M. Bixo ◽

I. Dahlbom ◽

T. Hansson ◽

...

Keyword(s):

Adipose Tissue ◽

Polycystic Ovary Syndrome ◽

Polycystic Ovary ◽

Adipose Tissue Inflammation ◽

Ovary Syndrome ◽

Tissue Inflammation ◽

Overweight Women

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Heat Therapy Decreases Adipose Tissue Inflammation and Improves Insulin Signaling in Polycystic Ovary Syndrome

The FASEB Journal ◽

10.1096/fasebj.2018.32.1_supplement.853.10 ◽

2018 ◽

Vol 32 (S1) ◽

Author(s):

Brett Romano Ely ◽

Zachary S. Clayton ◽

Carrie E. McCurdy ◽

Karen Wiedenfeld Needham ◽

Joshua Pfeiffer ◽

...

Keyword(s):

Adipose Tissue ◽

Polycystic Ovary Syndrome ◽

Insulin Signaling ◽

Polycystic Ovary ◽

Adipose Tissue Inflammation ◽

Ovary Syndrome ◽

Tissue Inflammation ◽

Heat Therapy

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Quantification of visceral adipose tissue in polycystic ovary syndrome: dual-energy X-ray absorptiometry versus magnetic resonance imaging

Acta Radiologica ◽

10.1177/0284185117711475 ◽

2017 ◽

Vol 59 (1) ◽

pp. 13-17 ◽

Cited By ~ 6

Author(s):

Signe Frøssing ◽

Malin Chatarina Nylander ◽

Elizaveta Chabanova ◽

Caroline Kistorp ◽

Sven O Skouby ◽

...

Keyword(s):

Adipose Tissue ◽

Waist Circumference ◽

Polycystic Ovary Syndrome ◽

Visceral Adipose Tissue ◽

Polycystic Ovary ◽

Dual Energy ◽

Ovary Syndrome ◽

X Ray ◽

Visceral Adipose ◽

Transverse Slice

Background Polycystic ovary syndrome (PCOS) is associated with frequent overweight and abdominal obesity. Quantifying visceral adipose tissue (VAT) in PCOS patients can be a tool to assess metabolic risk and monitor effects of treatment. The latest dual-energy X-ray absorptiometry (DXA) technology can measure VAT and subcutaneous adipose tissue (SAT) in a clinical setting. Purpose To compare DXA-measurements of VAT and SAT with the gold standard MRI in women with PCOS. Material and Methods A cross-sectional study of 67 overweight women with PCOS was performed. Measurements of VAT and SAT were performed by DXA in a 5-cm thick transverse slice at the L4/L5 level and by MRI in a 1-cm thick transverse slice at the L3 level. Results Mean (SD) DXA-VAT was 81 (34) cm3, DXA-SAT was 498 (118) cm3, MRI-VAT was 117 (48) cm3, and MRI-SAT was 408 (122) cm3. MRI and DXA measures of VAT (r = 0.82, P < 0.001) and SAT (r = 0.92, P < 0.001) correlated closely, and DXA-VAT was stronger correlated with MRI-VAT than BMI (r = 0.62, P < 0.001) and waist circumference (r = 0.60, P < 0.001). DXA-VAT coefficient of variance was 6.7% and inter correlation coefficient was 0.98. Bland–Altman analyses showed DXA to slightly underestimate VAT and SAT measurements compared with MRI. Conclusion DXA and MRI measurements of VAT and SAT correlated closely despite different size of region of interest, and DXA-VAT was superior to waist circumference and BMI in estimating MRI-VAT. DXA showed high reproducibility making it is suitable for repeated measurements in the same individual over time.

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Decreased lipin 1β expression in visceral adipose tissue is associated with insulin resistance in polycystic ovary syndrome

Acta Endocrinologica ◽

10.1530/eje-08-0387 ◽

2008 ◽

Vol 159 (6) ◽

pp. 833-839 ◽

Cited By ~ 13

Author(s):

Barbara Mlinar ◽

Marija Pfeifer ◽

Eda Vrtačnik-Bokal ◽

Mojca Jensterle ◽

Janja Marc

Keyword(s):

Insulin Resistance ◽

Adipose Tissue ◽

Waist Circumference ◽

Polycystic Ovary Syndrome ◽

Visceral Adipose Tissue ◽

Polycystic Ovary ◽

Ovary Syndrome ◽

Tissue Biopsy ◽

Visceral Adipose ◽

The Impact

ObjectiveIn polycystic ovary syndrome (PCOS), insulin resistance (IR) appears with high prevalence and represents the major cause of cardiometabolic complications. Lipin 1β regulates lipid metabolism and augments insulin sensitivity. The impact of lipin 1β expression in visceral and subcutaneous adipose tissue of PCOS patients on IR was studied for the first time.MethodsEighty-five PCOS patients and 44 controls were enrolled for subcutaneous tissue biopsy, of whom 25 patients and 30 controls also underwent visceral adipose tissue biopsy. Gene expression of lipin 1β was measured, together with that of peroxisome proliferator-activated receptor γ, lipoprotein lipase, hormone-sensitive lipase, adiponectin and glucose transporter 4 in subcutaneous and visceral adipose tissue. Markers of obesity, IR and PCOS were also measured.ResultsIn PCOS patients, lipin 1β expression in both adipose depots was lower than in controls: 0.76 (0.67–0.84) vs 1.16 (0.90–1.43) for visceral and 0.91 (0.73–1.10) vs 1.30 (1.03–1.57) for s.c. depot (both P<10−4). The difference remained significant after adjustment for body mass index (BMI) and also when comparing only lean patients with lean controls. In PCOS patients, visceral adipose lipin 1β expression correlated negatively with homeostasis model assessment–IR (r=−0.474, P=0.017), BMI (r=−0.511, P=0.009) and waist circumference (r=−0.473, P=0.017), waist circumference remaining significant (P=0.027) in multiple regression. Subcutaneous lipin 1β expression in PCOS correlated negatively with BMI, waist circumference and plasma triglycerides, and positively with high density lipoprotein-cholesterol. Subcutaneous, but not visceral lipin 1β expression, correlated positively with the studied genes.ConclusionsLipin 1β appears to be involved in the pathogenesis of IR in PCOS.

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