Relationship among plasma adipokines, insulin and androgens level as well as biochemical glycemic and lipidemic markers with incidence of PCOS in women with normal BMI
Department of Biochemistry, The Persian Gulf TropicalMedicine Research Center, Bushehr University of Medical Sciences, Bushehr, IR Iran.Gynecological Endocrinology (Impact Factor: 1.33). 02/2012; 28(7):521-4. DOI: 10.3109/09513590.2011.650747
Polycystic ovary syndrome (PCOS) is an endocrine disorder in women. Omentin-1 and vaspin are secretary adipokines that are produced by the visceral adipose tissue. These levels change in obese women with PCOS. The aim of this study is to investigate whether omentin and vaspin levels change in nonobese PCOS subjects. This study is a cross-sectional case control study in which 39 women with PCOS were picked out for this study. The inclusion criteria were based on the Rotterdam 2003 diagnostic criteria. The control group consisted of 39 women with normal pelvic sonographic reports having regular menstruation and showing no signs of infertility. The fasting plasma glucose (FPG), triglyceride (TG), Chol, and high-density lipoprotein cholesterol (HDL-C), insulin, testosterone, omentin and vaspin were measured by the enzymatic methods. The differences within these groups were calculated by the un-paired t-test and the Mann-Whitney test. The results from this study show a significant increase in the amount of insulin, testosterone, homeostasis model assessments for insulin resistance, TG and lower HDL in the patient group. No significant differences were seen in omentin, vaspin, FPG, Cho, low-density lipoprotein, very low-density lipoprotein cholesterol, blood urea nitrogen, Cr and homeostasis model assessments for B cell function levels between groups. Results show that PCOS is not a determinant of decreased omentin and vaspin plasma levels and those high androgen level and insulin resistances are warning signs of PCOS.
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ABSTRACT: Omentin is an adipokine preferentially produced by visceral adipose tissue with insulin-sensitizing effects. Its expression is reduced in obesity, insulin resistance and type 2 diabetes. Omentin is also positively related with adiponectin, high-density lipoprotein levels and negatively related with body mass index, waist circumference, insulin resistance, triglyceride and leptin levels. Lower plasma omentin levels contribute to the pathogenesis of insulin resistance, type 2 diabetes and cardiovascular diseases in obese or overweight patients. Omentin has anti-inflammatory, anti-atherogenic, anti-cardiovascular disease and antidiabetic properties. With respect to vascular biology, omentin causes vasodilatation of blood vessels and attenuates C-reactive protein-induced angiogenesis. The ability of omentin to reduce insulin resistance in conjunction with its anti-inflammatory and anti-atherogenic properties makes it a promising therapeutic target. Thus, omentin may have beneficial effects on the metabolic syndrome and could potentially be used as a biologic marker and/or pharmacologic agent/target in this respect.Current Vascular Pharmacology 06/2012; 12(1). DOI:10.2174/1570161112999140217095038 · 2.97 Impact Factor
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ABSTRACT: Objective To evaluate possible clinical effects of adiponectin, resistin, IL-6, and TNF-α in obese and non-obese patients with polycystic ovary syndrome (PCOS). Methods Seventy selected PCOS patients were recruited for this study, and were divided into two groups based on their body mass index (BMI): 35 obese (BMI ≥ 25 kg/m2, group A), 35 non-obese (BMI<25 kg/m2 group B). In addition, 35 healthy non-obese women (BMI<25 kg/m2) were enrolled as the control (group C). Serum levels of FSH, LH, T, glucose, insulin, adiponectin, resistin, IL-6, TNF-α were detected, and compared the differences of them among three groups. Results Blood glucose levels among three groups had no difference (P>0.05). Blood insulin level was significantly greater in group A than in group B or group C (P<0.05), and a significant difference existed between group B and group C (P<0.05). The ratio of glucose/insulin was significantly higher in group A than in group B or group C (P<0.05), and the ratio in group B was significantly higher than that in group C (P<0.05). Adiponectin level was significantly lower and resistin level was significantly higher in group A than in group B or group C (P<0.05). IL-6 level in group C was significantly lower than that in group A or group B (P<0.05), and significant difference was found between group A and group B (P<0.05). TNF-α level was a slight high in group B, whereas there was no statistical difference among three groups (P>0.05). Conclusion Disturbances of some metabolic and inflammatory adipokines could involve the pathogenesis of PCOS in both obese and non-obese women. Low-grade chronic inflammation might have negative effects on the development of PCOS in nonobese women.Journal of Reproduction and Contraception 12/2012; 23(4):237–244. DOI:10.1016/S1001-7844(12)60032-7
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ABSTRACT: Context:Sex hormones, particularly androgens, may influence not only adipose tissue distribution but also its functions.Objective:We explored the possibility of sexual dimorphism in adipose tissue and skeletal muscle function.Design:This was a case-control study.Setting:The setting was an academic hospital.Participants:Participants were severely obese men (n = 7), control women (n = 7), and hyperandrogenic women presenting with polycystic ovary syndrome (PCOS) (n = 7) submitting to bariatric surgery and an independent series of 40 patients with PCOS and 40 control women matched for age and body mass index.Interventions:Samples of subcutaneous (SAT) and visceral adipose tissue (VAT) and skeletal muscle were obtained during bariatric surgery in severely obese subjects.Main Outcome Measures:Gene expression of chemerin, lipocalin-2, and omentin-1 in tissue samples was measured. We analyzed the effects of PCOS and obesity on serum concentrations of these adipokines in the larger series of women with PCOS and in control women.Results:Expression of chemerin and lipocalin-2 was higher in VAT than in SAT in men and women with PCOS; the opposite was observed in control women. Omentin-1 expression was higher in VAT than in SAT in the three groups. No differences were observed in the skeletal muscle expression of these adipokines. Obesity increased serum chemerin and lipocalin-2 levels and tended to decrease omentin-1, irrespective of PCOS.Conclusions:The present results suggest that there is sexual dimorphism in some adipose tissue functions and that this dimorphism may be related to differences in androgen concentrations because women with PCOS show a masculinized pattern of expression of some adipokines.The Journal of Clinical Endocrinology and Metabolism 01/2013; 98(2). DOI:10.1210/jc.2012-3414 · 6.21 Impact Factor
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