© Borgis - Postępy Nauk Medycznych 8/2010, s. 587-594
*Jarosław Kozakowski, Wojciech Zgliczyński
Hypocaloric diet and pharmacological treatment reduces body weight, insulin resistance and androgen levels and restore menstruation in obese women with polycystic ovary syndrome
Wpływ niskokalorycznej diety i leczenia farmakologicznego na masę ciała, wrażliwość na insulinę, androgeny oraz na cykl miesiączkowy u otyłych kobiet z zespołem policystycznych jajników
Department of Endocrinology, Medical Center of Postgraduate Education, Bielański Hospital, Warsaw, Poland
Head of Department: prof. dr hab. med. Wojciech Zgliczyński
Wstęp: Celem pracy była ocena wpływu diety niskokalorycznej w połączeniu z leczeniem farmakologicznym (sibutramina) na ciężar i skład ciała, masę tłuszczu, szczególnie w obrębie tułowia, wrażliwość na insulinę, androgeny oraz miesiączkowanie u kobiet z zespołem policystycznych jajników (PCOS) z nadwagą i otyłością.
Materiał i metody: 20 kobiet z PCOS w wieku 19-49 lat z BMI 27,3-53,8 kg/m2, które były badane przed oraz po 1, 3 i 6 miesiącach leczenia dietą niskokaloryczną i sibutraminą w dawce 10-15 mg/dobę.
Wyniki: Ciężar ciała, BMI i obwód talii obniżyły się znamiennie już po pierwszym miesiącu leczenia (p<0,001) i ulegały dalszemu obniżaniu w okresie kolejnych miesięcy. W czasie 6 miesięcy masa tłuszczu spadła o 9,2% (p<0,001), a masa tłuszczu tułowia o 8,2% (p<0,001). Znamiennemu obniżeniu uległo stężenie w surowicy glukozy (p<0,01) i insuliny (p<0,01). Bardzo wyraźnie, choć nieznamiennie obniżył się wskaźnik HOMA. Znamiennie obniżyło się stężenie cholesterolu całkowitego (p<0,01), cholesterolu LDL (p<0,05) i triglicerydów (p<0,01) oraz wzrosło stężenie cholesterolu HDL (p<0,001). Już po pierwszym miesiącu leczenia obniżyło się znamiennie stężenie testosteronu (p<0,05), androstendionu (p<0,05) i DHEA-S (p<0,05). Stężenie androgenów obniżało się dalej w okresie kolejnych miesięcy. U osiemnastu kobiet powróciło miesiączkowanie.
Wnioski: W trakcie stosowania diety niskokalorycznej i leczenia farmakologicznego za pomocą sibutraminy obserwowano istotne zmniejszenie ciężaru ciała, korzystne zmiany wskaźników metabolicznych i czynników ryzyka chorób sercowo-naczyniowych, obniżenie stężenia androgenów i powrót miesiączkowania u większości kobiet z nadwagą i otyłością chorujących na PCOS.
Objective: To estimate the effects of the hypocaloric diet and pharmacological treatment with sibutramine on body weight, fat mass, especially abdominal fat, insulin resistance, serum androgens and menstruation pattern in overweight and obese women with polycystic ovary syndrome.
Material and methods: 20 females with PCOS aged 19-49 years with BMI 27.3-53.8 kg/m2 studied before and after 1, 3 and 6 months of the treatment with hypocaloric diet and sibutramine 10-15 mg/day. Measurement included body weight, BMI, waist circumference, total and trunk fat mass, glucose, insulin, blood lipids, androgens, LH, FSH, estradiol, fT4, TSH and menstrual pattern.
Results: Body weight, BMI and waist circumference significantly decreased already after 1st month (p<0.001) and were decreasing further during next months. Fat mass decreased of 9.2% (p<0.001) and fat mass of the trunk of 8.2% (p<0.001) after 6 months. In the same time significant decrease in serum fasting glucose (p<0.01), insulin (p<0.01), total cholesterol (p<0.01), LDL-cholesterol (p<0.05) and triglicerydes (p<0.01) were observed. HDL-cholesterol increased significantly (p<0.001). Throughout the study serum testosterone, androstendione and DHEA-S levels decreased significantly (p<0.01; p<0.05 and p<0.001, respectively). Menstrual bleedings reoccurred in eighteen women throughout the study.
Conclusions: Hypocaloric diet plus pharmacological treatment with sibutramine caused a significant weight loss, had beneficial effects on some metabolic and cardiovascular risk factors, reduced androgens and restored menstruations in overweight and obese women with polycystic ovary syndrome.
Polycystic ovary syndrome (PCOS) is one of the most frequent endocrine disorders in women in the reproductive age. The overall prevalence of PCOS in this population is estimated to be 5-10% (1). In 2003 an international consensus group in Rotterdam recommended that the diagnostic criteria for PCOS include ovarian dysfunction evidenced by at least two of the following features: 1) oligo- or anovulation, 2) clinical and/or biochemical signs of hyperandrogenaemia and 3) polycystic ovaries in the absence of other conditions that can cause similar signs and symptoms (2). The pathogenesis of this disorder is still far from full elucidation and is considered to result of complex of genetic and environmental factors.
Women with PCOS may experience a wide variety of symptoms, which may change over time, although abnormal uterine bleeding, symptoms of androgen excess: acne or hirsutism and polycystic ovaries are common features. In laboratory data disturbed ovarian and adrenal steroidogenesis, reduced levels of SHBG, insulin resistance with subsequent hyperinsulinemia and unfavorable lipid profile can be found (3-5).
Approximately half of the women with this syndrome are overweight or obese (6). It was found that patients with PCOS present mostly central type of obesity, whereas 70% of lean women have rather an android distribution of fat (7). Abdominal obesity is a major underlying factor in insulin resistance. However, insulin resistance was found also in lean women with PCOS (8). Insulin resistance leads to elevated circulating glucose and increase pancreatic insulin secretion resulting in hyperinsulinemia, that may in turn contribute to hypertension. Associated defects include the proinflammatory state with increased circulating of interleukin-6, TNFα and other cytokines. Cytokines and fatty acid also increase the production of fibrinogen and PAI-1 by the liver causing a prothrombotic state (9). As a consequence patients with PCOS have unfavorable cardiovascular risk profile (10, 11). Gynoid fat is considered to be much less active in this matter and is in fact believed to protect against atherogenesis. In women with PCOS obesity is also associated with androgen excess additionally contributing to vascular damage and to fertility disorders (12).
Several approaches have been proposed to correct metabolic abnormalities, restore menstruations and to induce ovulations in PCOS patients. These methods usually include lifestyle changes early on such as diet and exercises and use of various ovulation-inducing agents (eg, clomiphene-citrate, aromatase inhibitors, gonadotropins), insulin-sensitizing drugs (eg, metformin), and surgical treatment (eg, laparoscopic ovarian drilling, laser surgery) (13-16). Large randomized trials that have been conducted to compare clomiphene with metformin as a first-line treatment for anovulatory infertility have given conflicting results, so there is no unambiguous view in this matter (13, 17). Because metabolic alterations resulting from excess weight, mostly in form of abdominal obesity are widely considered the pivotal feature of PCOS approach pointed at lowering of the body weight, especially reducing abdominal fat seems to be the causal treatment of choice. Although there is no doubting in efficacy of lifestyle modification it is extremely difficult to maintain weight loss in obese patients only on that way. More weight loss and better metabolic results have been found in patients who in addition have taken insulin-sensitizing (metformin) or weight-lowering (sibutramin, rimonabant) drugs (18-22).
The aim of our study was to estimate the effects of the hypocaloric diet and pharmacological treatment with sibutramine on body weight, fat mass, especially abdominal fat, insulin resistance, serum androgens and menstruation pattern in overweight and obese women with polycystic ovary syndrome.
Material and methods
A total of twenty females with PCOS aged 19-49 years, mean 30.2 ± 8.5 (x ± SD) were studied. Their BMI were 27.3-53.8 kg/m2, mean 38.1 ± 6.4. One women was overweight and nineteen were obese. The diagnosis of PCOS was based on mentioned above criteria of the Rotterdam consensus. Oligomenorrhea was defined as menstrual periods that occur at intervals of greater than 35 days, with only four to nine periods in a year, and amenorrhea as the complete absence of menstruation. Clinical hyperandrogenaemia was defined as presence of hirsutism or acne. Biochemical hyperandrogenaemia was defined as serum testosterone levels greater than 0.9 ng/ml, androstendione levels greater than 310 ng/dl and dehydroepiandrosterone-sulfate levels greater than 2000-4100 ng/ml, depending on age. Ovary in USG were defined as polycystic when they included either 10 or more follicles measuring 2-9 mm in diameter or their volume was greater than 10 cm3.
The exclusion criteria included hypothyroidism, hyperprolactinemia, Cushing's syndrome, nonclassical congenital adrenal hyperplasia, and current or previous (within the last 3 months) use of oral contraceptives and other hormonal, antidiabetic and antiobesity drugs.
Subjects were studied in the course of the four visits in clinic: before treatment and after one, three and six months of dietary and drug intervention. Each visit included full physical examination with measurement of waist circumference, body height and weight, and then body mass index (BMI) was calculated. Blood was collected after an overnight fast at about 0800 h for glucose, lipids (total cholesterol, low-density lipoprotein cholesterol, high-density lipoprotein cholesterol and triglicerydes), insulin, LH, FSH, estradiol, testosterone, androstendione, dehydroepiandrosterone-sulfate, TSH and free tyroxine through an iv catheter placed in the forearm. To estimate insulin resistance the HOMA index was calculated by the formula: fasting plasma insulin (microinternational units per milliliter) x fasting plasma glucose (millimoles per liter)/22.4. Subjects were considered as insulin resistant when HOMA index was> 2.5. Hypercholesterolaemia was defined as total cholesterol level above 5.2 mmol/l and hypetrigicerydaemia when trigicerydes level was higher than 1.81 mmol/l. During the first visit all of the subjects underwent transvaginal ultrasonography (TV-USG) and USG of abdomen to exclude adrenal pathology. At the start and in the end of the study body composition by dual-energy X ray absorptiometry (DEXA) was determined. The same operator performed all DEXA measurements.
From the beginning of the study all patients were on hypocaloric diet, that was determined individually. In each case the mean caloricity of current diet was calculated, and then the new regimen, containing 700 kcal per day less compared with initial caloricity was compiled. While continuing dietary treatment, women were received sibutramine (sibutramini hydrochloride, Zelixa, Biofarm, Poland) in the initial dose 10 mg daily. This dose was increased to 15 mg per day when the decline of body weight was not satisfying, it means that was lower than 0.5-1 kg per week. In two cases dose was reduced after third month of the treatment. Two subjects with considerable insulin resistance were additionally treated with metformin 500 mg twice a day. Four patient were on stable treatment with l-tyroxine.
Before the start of the study all subject were required not to become pregnant because of the risk of sibutramine (and metformin) in case of pregnancy and instructed to use adequate birth control methods. The consent was obtained from all of the participants.
Glucose was measured with glucose hexokinase reagent set with sensitivity 2.16 mg/dL. An enzymatic colorimetric method was used to measure total cholesterol in the presence of cholesterol oxidase and esterase. The sensitivity was 0.116 mg/dL. HDL-cholesterol was measured with enzymatic colorimetric method, sensitivity was 3 mg/dL. Triglicerydes were also measured with enzymatic colorimetric method with sensitivity 0.85 mg/dL. All mentioned biochemical measurements were performed using Roche Cobas Integra 400 chemistry analyzer (Roche Diagnostics). Insulin was measured by immunoradiometric method (Insulin IRMA – Immunotech SA, France); sensitivity was 2.0 mIU/ml. LH, FSH, TSH and free thyroxin (fT4) were measured by immunochemiluminescence method with IMMULITE 2000 (Siemens Healthcare Diagnostics, Inc). Estradiol was measured with the same IMMULITE 2000 analyzer; sensitivity was 15 pg/ml. Total testosterone was measured by RIA-CT method (Immunotech SA, France); sensitivity of this method was 0.025 ng/ml. Androstendione was measured by direct RIA-CT (DSL, USA). Dehyrdroepiandrosterone-sulfate was measured by RIA-CT method (Spectria, Orion Diagnostica, Finland); sensitivity of this method was 10 ng/ml.
Body mass index was calculated as a body weight (kg)/height2 (m2). Subjects with BMI between 25 and 30 kg/m2 were considered as overweight, whereas subjects with BMI between 30 and 40 kg/m2 were considered as obese, and with BMI above 40 kg/m2 as morbidly obese.
To measurements of body composition by DEXA method we performed a total body scans with use of Lunar Prodigy (GE Lunar, Madison, WI, USA) equipment, that was calibrated each day with a standardized phantom and serviced regularly. The coefficient of variation for measurements of body composition with this method is about 2%.
All the data are presented as the mean ± SD. The normality of the distribution of variables were verified with a Kolmogorov-Smirnov and Lilieforse tests. To examine bivariate relationships between data Pearson correlation or Spearman rank analyses were used. Comparisons between groups with normal distribution of the data were performed by unpaired Student's t-test, in other cases comparisons were performed by Kolmogorov-Smirnov test for two samples. For all analysis, a two-tailed P = 0.05 was considered to indicate statistic significance.
Twenty females participated in the study. Their mean age was 30.2 ± 8.6 years. In table 1 baseline anthropometric data, body mass index and fat, blood pressure and biochemical results of the studied subjects are shown. The cohort represented a relatively broad range of age. One patient was overweight, eleven were obese and eight were considered as morbidly obese. DEXA results showed that all of the subjects had increased abdominal fat. Two women were hypertensive. In eight of them hypercholesterolemia and in ten hypertrigicerydemia were found.
Table 1. Baseline anthropometric characteristics, blood pressure and biochemical data of the study subjects.
|No||N=||Mean ? SD||Range|
|1.||Age (yr)||20||30.25 ? 8.6||19.0-49.0|
|2.||Height (m)||20||1.64 ? 0.06||1.51-1.74|
|3.||Weight (kg)||20||103.23 ? 22.2||70.0-163.0|
|4.||BMI (kg/m2)||20||38.09 ? 6.4||27.3-53.8|
|5.||WC (cm)||20||111.2 ? 14.3||85.5-137.0|
|6.||Total FM (kg)||19||50.43 ? 12.8||27.0-78.1|
|7.||FMt (kg)||19||25.6 ? 6.6||13.4-36.9|
|9.||Systolic BP (mm Hg)||20||125.25 ? 11.5||105-150|
|10.||Diastolic BP (mm Hg) ||20||80.75 ? 10.4||60-100|
|11.||Total cholesterol (mmol/l)||20||5.13 ? 0.9||3.60-7.89|
|12.||LDL cholesterol (mmol/l)||20||3.05 ? 0.7||1.90-5.51|
|13.||HDL cholesterol (mmol/l)||20||1.15 ? 0.2||0.77-1.58|
|14.||Triglicerydes (mmol/l)||20||1.96 ? 0.8||0.68-3.80|
|15.||Glucose (mmol/l)||20||5.15 ? 0.8||4.00-6.72|
BMI, body mass index; WC, waist circumference; FM, fat mass; FMt, fat mass of the trunk; BP, blood pressure.
In table 2 initial hormonal results are shown. All women were hyperandrogenic and all except one were euthyroic. Seven had elevated fasting serum insulin levels, and fifteen were considered as insulin resistant according to HOMA index.
Table 2. Hormonal results at the beginning of the study.
|No||Hormone||N=||Mean ? SD||Range|
|1.||Insulin (uIU/mL)||20||18.3 ? 9.0||2.0-33.0|
|2.||HOMA ||20||4.33 ? 2.38||0.35-9.86|
|4.||Testosterone (ng/mL)||20||1.04 ? 0.45||0.20-2.10|
|5.||DHEA-S (ng/mL)||20||2973.4 ? 1151||518.0-4496.0|
|6.||Androstendione (ng/dL)||20||306.6 ? 163.2||104.0-835.0|
|7.||LH/FSH||19||1.57 ? 2.39||0.09-11.10|
|8.||Estradiol (pg/mL)||19||74.8 ? 42.9||40.0-238.0|
|9.||TSH (uIU/mL)||18||1.21 ? 0.6||0.012-2.01|
|10.||fT4 (pmol/L)||16||17.70 ? 1.65||14.70-20.50|
HOMA, homeostatic model assessment; DHEA-S, dehydroepiandrosterone-sulfate; LH, luteinizing hormone; FSH, follicle stimulating hormone; TSH, thyroid stimulating hormone; fT4, free thyroxin.
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