Metformin treatment is effective in obese teenage girls with PCOS
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1 Human Reproduction Page 1 of 5 Hum. Reprod. Advance Access published June 19, 6 doi:1.193/humrep/del185 Metformin treatment is effective in obese teenage girls with PCOS Vincenzo De Leo 1, M.C.Musacchio, G.Morgante, P.Piomboni and F.Petraglia Department of Pediatrics, Obstetrics and Reproductive Medicine, Institute of Obstetrics and Gynecology, University of Siena, Siena, Italy 1 To whom correspondence should be addressed at: Institute of Obstetrics and Gynecology, University of Siena, Policlinico Le Scotte, Via Bracci, 531 Siena, Italy. deleo@unisi.it BACKGROUND: Polycystic ovary syndrome (PCOS) is the most frequent cause of menstrual disorders in teenage girls. Little information is available about the effects of metformin in adolescent girls with PCOS and its dose and its efficacy in regulating menstrual cyclicity and hyperandrogenic symptoms. We evaluated the effects of metformin treatment on ovulatory function, hirsutism, acne, hormonal patterns and body weight in adolescent girls with PCOS. METHODS: Eighteen girls, ranging in age from 15 to 18 years, were enrolled in the study. Clinical diagnosis of PCOS was based on the consensus criteria for PCOS accepted in May 3 at Rotterdam. All subjects received 17 mg/day metformin as tablets continuously for 6 months. They were then followed up for 6 months. RESULTS: Two patients complained of side effects for > weeks and interrupted treatment; they were not evaluated. All the others showed an improvement in menstrual cyclicity. Menstrual periods were ovulatory, with progesterone levels up to 6 ng/ml in luteal phase and a significant reduction in testosterone, androstenedione and free testosterone. BMI was restored within normal limits in all girls between 1 and kg/m. Six months after the end of metformin treatment, menstrual cycles continued to be regular and ovulatory with normal BMI. Side effects were slight. CONCLUSIONS: The present results confirm the positive effects of metformin on menstrual periods and show that the drug can be administered to young women to improve ovulation and hyperandrogenic symptoms such as hirsutism, acne and weight gain. Key words: adolescents/androgens/hirsutism/metformin/obese/pcos Introduction Polycystic ovary syndrome (PCOS) is the most frequent cause of menstrual disorders in teenage girls. After menarche, young women may show many initially minor or moderate symptoms that aggravate with time. These symptoms include menstrual irregularity, hirsutism, acne and obesity. Hormonal profile and ultrasound examination indicate PCOS. Insulin-resistance tests [homeostasis model assessment (HOMA) or oral glucose tolerance test (OGTT)] are now performed as well. Insulin resistance and consequent elevated plasma concentrations of insulin are reported to be associated with high androgen concentrations and related symptoms such as anovulation, oligomenorrhoea, hirsutism, acne and seborrhoea in adolescent girls with PCOS (Adams et al., 1986; Gilling-Smith and Franks, 1993). More than 5% of girls with this syndrome are obese, and many develop type diabetes in later life (Chang et al., 1983; Jalal et al., 1987). The clinical disorders and infertility have been ascribed to high levels of insulin and LH, high LH/FSH ratio and increased ovarian androgen production (Wajchenberg et al., 1986; Waldestreicher et al., 1988; De Leo et al., 3). Hyperinsulinaemic insulin resistance and increased ovarian cytochrome P-5 and 17,-lyase enzymatic activity, two features of PCOS, are pathogenically linked (La Marca et al., ). Insulin has been shown to stimulate the proliferation of thecal cells, increase LH-stimulated androgen secretion, increase P5c17mRNA levels, up-regulate LH receptors and up-regulate ovarian insulin-like growth factor-i (IGF-I) receptors (De Leo et al., 3). In PCOS patients, high local androgen concentrations are responsible for anovulation by a direct effect on the ovary (Ehrmann et al., 1995). In the last 1 years, insulin-lowering drugs have become widely used in the treatment of PCOS, particularly for the induction of ovulation. Many studies have demonstrated the efficacy of metformin, a biguanide normally used to treat noninsulin-dependent diabetes, in inducing ovulation in PCOS patients with insulin resistance (Nestler et al., 1998; De Leo et al., 1999). Metformin is the most thoroughly investigated insulin-lowering agent used to treat PCOS; it enhances insulin sensitivity in the liver, where it inhibits hepatic glucose production, and in muscle, where it improves glucose uptake and use (De Leo et al., 3). One of the main reasons PCOS patients seek medical advice is menstrual irregularity. Oligomenorrhoea and amenorrhoea are usually linked to the absence of ovulation. Available The Author 6. Published by Oxford University Press on behalf of the European Society of Human Reproduction and Embryology. All rights reserved. 1 For Permissions, please journals.permissions@oxfordjournals.org
2 V.De Leo et al. studies indicate that 6 months of metformin therapy induces an improvement in menstrual regularity in at least 5% of patients (De Leo et al., 3). Although confirmation is needed, it seems that responders have high insulin levels, low androgen levels and less severe menstrual abnormalities before therapy. This suggests that the best candidates for metformin therapy have oligomenorrhoea rather than amenorrhoea and are overweight rather than obese. The relationship between PCOS, oligomenorrhoea, hyperandrogenism and hyperinsulinism has been well documented in adults, but less in young women (Rosenfield et al., ; Van Hooff et al.,, ). Hyperinsulinaemia has been documented in a small group of oligomenorrhoeic adolescents with obesity (Apter et al., 1995) and in a group of lean anovulatory or oligo-ovulatory hyperandrogenaemic adolescents (Ibanez et al., 1). Regarding medical treatment, little data are yet available about the effects of metformin in young women with PCOS, especially about its dose and ability to regulate menstrual cyclicity and hyperandrogenic symptoms. In this study, we evaluated the effect of metformin treatment on ovulatory function, hirsutism, acne, hormone patterns and body weight in 18 girls with PCOS. Materials and methods Subjects Eighteen obese girls with PCOS, ranging in age from 15 to 18 years, were enrolled in the study. The study was approved by the ethical committee of the University Medical School, and informed consent was obtained from each patient. The clinical diagnosis of PCOS was defined according to the consensus criteria for PCOS with the presence of clinical and biochemical signs of hyperandrogenism, chronic anovulation and/or oligomenorrhoea and polycystic ovaries (The Rotterdam ESHRE/ASRM-sponsored PCOS consensus workshop group, ). Hirsutism was evaluated by the modified Ferriman Gallwey method (Hatch et al., 1981), and the mean score was 1 ±.5 (mean ± SD). Menstrual bleeding occurred every 5 6. All women were obese, with a BMI between 5.5 and 7 kg/m. Insulin resistance was diagnosed by OGTT. The criteria for hyperinsulinemia were insulin basal levels >15 pmol/l and response >8 pmol/l at 9 min. All women had fasting insulin concentrations >15 pmol/l and cumulative insulin concentrations >8 pmol/min [area under the curve (AUC) insulin during a -h 75 g oral glucose test]. Basal hormone concentrations [LH, FSH, androstenedione, testosterone, free testosterone, estradiol (E ), 17-hydroxyprogesterone (17- OHP), progesterone and sex hormone-binding globulin (SHBG)] were evaluated every from 7 to 5 of the cycle, the month therapy was started and in the last month of therapy. Before treatment, basal hormone levels indicated anovulatory cycles, and androgens were at the upper limits of the normal range. All women were normoprolactinaemic and had normal thyroid function. None of the patients had virilization or congenital adrenal hyperplasia (on the basis of normal levels of 17-OHP). A baseline ultrasound scan of uterus and ovaries was performed. The ultrasonographic diagnosis of PCOS was based on the presence of 1 follicles ( 1 mm in diameter) in one or both ovaries. Study protocol The patients entered the study on 6 8 of induced menstrual bleeding. All received 17 mg/day metformin (Metforal; Guidotti, Pisa, Italy) as tablets uninterruptedly for 6 months. Hirsutism was evaluated by a modified form of the Ferriman Gallwey method that has been used in our clinic for many years. A score was assigned to patients before and after 6 months of metformin therapy. A score >8 is indicative of hirsutism. Patients were followed up for 6 months with plasma progesterone determinations on day of the menstrual cycle. Hormone assay Plasma LH, FSH, E, testosterone, androstenedione, free testosterone, 17-OHP, progesterone and SHBG were measured by double-antibody radioimmunoassay using Radim Kits (Rome, Italy) for LH and FSH, Sorin Kits (Saluggia, Italy) for androstenedione, progesterone and testosterone, DPC Kits (Los Angeles, CA, USA) for SHBG, free testosterone and 17-OHP and Biodata Kits (Rome, Italy) for E. Free androgen index (FAI) was calculated as testosterone/shbg 1. Samples were assayed in duplicate at two dilutions. All samples from each subject were assayed together. Quality-control pools at low, medium and high hormone concentrations were included in each assay. The assay detection limits were. IU/l for LH,.18 IU/l for FSH, 18 pmol/l for E,.16 nmol/l for progesterone,.5 pmol/l for free testosterone, 77 pmol/l for testosterone, 1 pmol/l for androstenedione,.1 nmol/l for 17-OHP and. nmol/l for SHBG. The intra- and interassay variations were 7.8 and 8.% for LH, 6. and 6.5% for FSH,. and.9% for E, 8.5 and 1.8% for progesterone, 3. and.6% for testosterone, 3. and 3.% for free testosterone, 5.6 and 6.% for androstenedione, and.8% for 17-OHP and 6.9 and 13% for SHBG. Analytical methods were highly specific for each hormone with an extremely low cross-reactivity (<.5%) to other naturally occurring hormones or therapeutic drugs that may be present in samples. Statistical analysis To assess responses to metformin therapy, we compared basal hormone concentrations, maximum increments (maximum rise above baseline) and AUC (cumulative rise above baseline) using the non-parametric Wilcoxon test. Differences were considered significant for P <.5. Results Clinical effects The drug was well tolerated by all patients. Two patients who complained of side effects for > weeks and interrupted treatment were not evaluated. The others showed an improvement in menstrual cyclicity. After the first month of treatment, menstrual bleeding returned to once a month within 3 of the start of the second month of therapy. Menstrual periods were ovulatory, with progesterone levels up to 6 ng/ml in luteal phase and a significant reduction in testosterone, androstenedione and free testosterone. The Ferriman Gallwey score for hirsutism decreased significantly from 1 ±.5 to 7 ± 1. (mean ± SE) after 6 months of metformin treatment (Figure 1). In many girls, acne and/or seborrhoea were greatly alleviated after 6 months of treatment; only in patients did mild acne persist, especially before menstrual bleeding. BMI was restored within normal limits in all girls between 1 and kg/m. Six months after the end of metformin treatment, menstrual cycles continued to be regular and ovulatory with normal BMI (Table I). Endocrine effects Table II summarizes hormone concentrations during follicular phase therapy and at the sixth month of
3 Metformin in adolescent girls with PCOS Ferriman and Gallwey score Figure 1. A graph showing the Ferriman Gallwey score in patients with polycystic ovary syndrome (PCOS) before and after 6 months of metformin treatment. *P <.1. Table I. Clinical parameters of the 16 women evaluated before and after 6 months of metformin treatment Before metformin treatment. Significant reduction (P <.1) in basal levels of LH, androstenedione, testosterone, free testosterone and LH/ FSH ratio was observed. SHBG concentrations showed a significant increase in all women. Figure shows the patterns of plasma concentrations (medians and ranges) of LH and FSH measured every for 5 weeks before therapy and during the sixth month of treatment. Before * After sixth month of treatment Days of cycles (range) BMI (kg/m ) (range) Ferriman Gallwey score (mean ± SE) 1 ±.5 7 ± 1. Table II. Hormone concentrations (medians and ranges) in blood samples of 16 women drawn on day 8 of the menstrual cycle therapy and on day 8 of the cycle in the sixth month of treatment showing significant reductions (P <.1) in LH, androstenedione, testosterone, free testosterone and the LH/FSH ratio Before metformin [median (range)] Sixth month of treatment [median (range)] LH (miu/ml) 1.1 ( ) 5.9 ( ) FSH (miu/ml) 3.85 (.1 5.6) 6.35 (.8 8.) LH/FSH ratio.3 (5..9) 1.1 (.9 1.7) Androstenedione (pg/ml) 865 ( ) 13 ( ) Testosterone (nmol/l) 3.57 (1.8 6.).9 (1.6.3) Free testosterone (pg/ml). (1.9 7.).87 ( ) SHBG (nmol/l) 3. (5 8).63 (8 81) Free androgen index (FAI) 1.9 ( ) 6.8 ( ) Estradiol (E ) (pg/ml) 6.88 (5 8) (78 11) Progesterone (pg/ml) 761 (6 9) 3 (3 5) Sex hormone-binding globulin (SHBG) concentrations showed a significant increase in these women. mui/ml mui/ml Figure. Plasma LH and FSH levels in polycystic ovary syndrome (PCOS) patients therapy and during the sixth month of treatment. metformin treatment, basal LH levels were high and without a peak, having a median value of 1.1 miu/ml (range ) for all cycles. During the sixth month of therapy, LH showed a reduction in basal levels and an ovulatory peak at in all women. FSH also showed a small increment in follicular phase during treatment with a small peak on the same as LH. Before metformin treatment, the LH/FSH ratio was.3 (range 5..9). During therapy, LH showed a reduction in basal levels, and the LH/FSH ratio decreased. Before metformin therapy, E and progesterone showed constant patterns. During metformin therapy, E and progesterone patterns reflected ovulatory cycles, with median luteal-phase progesterone levels of 61 ± 1 pg/ml (Figure 3). Plasma androgen levels were high before treatment. During metformin treatment, testosterone, free testosterone and androstenedione showed significant reductions in all women. The mean reduction was % for testosterone, 3% for free testosterone, % for androstenedione and 35% for FAI. Fasting insulin levels and AUC insulin were low during metformin treatment with basal plasma levels <5 miu/l. Progesterone levels during follow-up (day of the cycle) showed maintenance of ovulation with progesterone concentrations >5 pg/ml in all women. Discussion The results of this study confirm the beneficial effects of metformin on ovulation in young women with PCOS and provide new information about the drug s hormonal and clinical effects in this disorder. LH FSH
4 V.De Leo et al. Figure 3. Plasma estradiol (E ) and progesterone levels in polycystic ovary syndrome (PCOS) patients therapy and during the sixth month of treatment. Insulin resistance has long been recognized as a feature of PCOS (Chang et al., 1983; De Leo et al., 3). Insulin resistance and elevated plasma levels of insulin are associated with high androgen concentrations in PCOS patients. There is evidence that insulin stimulates ovarian androgens in vitro (Poretsky et al., 1999). Insulin inhibits liver secretion of SHBG, increasing the availability of androgens (Preziosi et al., 1993). Another mechanism of action could be the inhibition of liver synthesis of IGF-I in the ovary, directly influencing ovarian steroidogenesis through a specific receptor (Poretsky et al., 1999). After menarche, adolescent women show a transient state of anovulation. This period is considered physiological within the ontogeny of fertility (Metcalf et al., 1983). However, in certain young women, regular menstrual cycles fail to occur within 3 years of menarche and the anovulatory condition persists. The prevalence of PCOS in women aged 18 5 years is 8% (Michelmore et al., 1999). However, studies suggest that PCOS begins in early puberty and evolves through adolescence into adulthood (Van Hooff et al., ). The most common treatment in these patients worldwide is the contraceptive pill, especially those with anti-androgenic progestins (Lemay and Poulin, ; Wiegratz and Kuhl, ). The clinical outcome is good during therapy, but after termination, the symptoms recur and the young women undergo an increase in body weight. Many articles have shown that metformin induces a significant improvement in insulin levels and menstrual cycles in oligo-amenorrhoeic teenagers with PCOS (Ibanez et al., 1). Six months of treatment was followed by significant reductions pg/ml pg/ml Estradiol Progesterone in serum lipids and hirsutism (Ibanez et al., ), indicating that insulin lowering has a normalizing effect on multiple aberrations in the endocrine metabolic profile of adolescents with ovarian hyperandrogenism. Metformin treatment of 15 obese adolescents with impaired glucose tolerance and PCOS for 6 months was found to be beneficial for glucose tolerance, insulin sensitivity, insulinaemia and elevated androgen levels (Arslanian et al., ). Our present study confirms the positive effects of metformin on menstrual periods and shows that the drug can be administered in young women to improve hyperandrogenic symptoms such as hirsutism and acne, as well as ovulation. The beneficial effect of metformin on acne and hirsutism in adolescents could therefore be due to the restoration of ovulation and the normalization of estrogens. It is recognized that high insulin levels exert anabolic effects and modify fat distribution: our results showed a significant reduction in BMI to <5 kg/m. This weight reduction may be due to the normalization of plasma insulin resulting in reduced appetite. Our young women were therefore prescribed a lowcarbohydrate high-protein diet to reduce BMI, restore ovulation and reduce acne and hirsutism. It has been shown that weight loss, accompanied by an increase in insulin sensitivity, can improve metabolic and hormonal abnormalities characteristic of the PCOS (Pasquali et al., 1989; Anderson et al., 1995). Finally, early pharmacological intervention with metformin could possibly prevent manifestation of the complete spectrum of PCOS in young overweight girls. The persistence of regular ovulatory menstrual cycles in the 6 months after the end of treatment demonstrates that metformin treatment provides lasting benefits. All girls maintained a BMI <5 kg/m, and this can play a role in normal ovulation menstrual cycles. These patients are under follow-up for weight changes and to see how long normal menstrual cycles last. This study shows the efficacy of metformin in adolescent women with anovulation and moderate obesity, confirming previous trials and contributing important information about the preventive effect of the drug on full manifestation of PCOS in young women. In these patients, metformin could well be a more appropriate treatment than estroprogestin pills. References Adams J, Polson DW and Franks S (1986) Prevalence of polycystic ovaries in women with anovulation and idiopathic hirsutism. Br Med J 93, Anderson P, Seljeflot I, Abdelnoor M, Arnesen H, Dale PO, Lovik A and Birkeland K (1995) Increased insulin sensitivity and fibrinolytic capacity after dietary intervention in obese women with polycystic ovary syndrome. Metabolism (5), Apter D, Bützow T, Laughlin A and Yen SS (1995) Metabolic features of polycystic ovary syndrome are found in adolescent girls with hyperandrogenism. J Clin Endocrinol Metab 8, Arslanian SA, Lewy V, Danadian K and Saad R () Metformin therapy in obese adolescents with polycystic ovary syndrome and impaired glucose tolerance: amelioration of exaggerated adrenal response to adrenocorticotropin with reduction of insulinemia/insulin resistance. J Clin Endocrinol Metab 87, Chang JR, Nakamura RM, Judd HL and Kaplan SA (1983) Insulin resistance in nonobese patients with polycystic ovarian disease. J Clin Endocrinol Metab 57, De Leo V, La Marca A, Ditto A, Morgante G and Cianci A (1999) Effects of metformin on gonadotropin-induced ovulation in women with polycystic ovary syndrome. Fertil Steril 7,8 85.
5 Metformin in adolescent girls with PCOS De Leo V, La Marca A and Petraglia F (3) Insulin-lowering agents in the management of polycystic ovary syndrome. Endocr Rev, Ehrmann DA, Barnes RB and Rosenfield RL (1995) Polycystic ovary syndrome as a form of functional ovarian hyperandrogenism due to dysregulation of androgen secretion. Endocr Rev 16, Gilling-Smith C and Franks S (1993) Polycystic ovary syndrome. Reprod Med Rev,15 3. Hatch R, Rosenfield R, Kim MH and Tredway D (1981) Hirsutism: implications, etiology, and management. Am J Obstet Gynecol 1, Ibanez L, Valls C, Potau N, Marcos MV and De Zegher F () Sensitization to insulin in adolescent girls to normalize hirsutism, hyperandrogenism, oligomenorrhea, dyslipidemia, and hyperinsulinism after precocious pubarche. J Clin Endocrinol Metab 85, Ibanez L, Valls C, Ferrer A, Marcos MV, Rodriguez-Hierro F and de Zegher F (1) Sensitization to insulin induces ovulation in nonobese adolescents with anovulatory hyperandrogenism. J Clin Endocrinol Metab 86, Jalal I, Naiker P, Reddi K, Moodley J and Joubert SM (1987) Evidence for insulin resistance in nonobese patients with polycystic ovarian disease after inhibition of ovarian steroid secretion. Fertil Steril 5, La Marca A, Egbe TO, Morgante G, Paglia T, Cianci A and De Leo V () Metformin treatment reduces ovarian cytochrome P-5c17α response to human chorionic gonadotrophin in women with insulin resistance-related polycystic ovary syndrome. Hum Reprod 15,1 3. Lemay A and Poulin Y () Oral contraceptives as anti-androgenic treatment of acne. J Obstet Gynaecol Can, Metcalf MG, Skidmore DS, Lowry GF and Mackenzie JA (1983) Incidence of ovulation in the years after the menarche. J Endocrinol 97, Michelmore KF, Balen AH, Dunger DB and Vessey MP (1999) Polycystic ovaries and associated clinical and biochemical features in young women. Clin Endocrinol 51, Nestler JE, Jakubowicz DJ, Evans WS and Pasquali R (1998) Effects of metformin on spontaneous and clomiphene-induced ovulation in the polycystic ovary syndrome. N Engl J Med 338, Pasquali R, Antenucci D, Casimirri F, Venturoli S, Paradisi R, Fabbri F, Balestra V, Melchionda N and Barbara L (1989) Clinical and hormonal characteristics of obese amenorrheic hyperandrogenic women before and after weight loss. J Clin Endocrinol Metab 68(1), Poretsky L, Cataldo NA, Rosenwaks Z and Giudice LC (1999) The insulin-related ovarian regulatory system in health and disease. Endocr Rev, Preziosi P, Barrett-Connor E, Papoz L, Roger M, Saint-Paul M, Nahoul K and Simon D (1993) Interrelation between plasma sex hormone-binding globulin and plasma insulin in healthy adult women: the telecom study. J Clin Endocrinol Metab 76, Rosenfield RL, Ghai K, Ehrmann DA and Barnes RB () Diagnosis of the polycystic ovary syndrome in adolescence: comparison of adolescent and adult hyperandrogenism. J Pediatr Endocrinol Metab 13, The Rotterdam ESHRE/ASRM-sponsored PCOS consensus workshop group () Revised consensus on diagnostic criteria and long-term health risks related to polycystic ovary syndrome (PCOS). Hum Reprod 19,1 7. Van Hooff MH, Voorhorst FJ, Kaptein MB, Hirasing RA, Koppenaal C and Schoemaker J () Polycystic ovaries in adolescents and the relationship with menstrual cycle patterns, luteinizing hormone, androgens, and insulin. Fertil Steril 7,9 58. Van Hooff MH, Voorhorst FJ, Kaptein MB, Hirasing RA, Koppenaal C and Schoemaker J () Predictive value of menstrual cycle pattern, body mass index, hormone levels and polycystic ovaries at age 15 years for oligoamenorrhoea at age 18 years. Hum Reprod 19, Wajchenberg BL, Achando SS, Okada H, Czeresnia CE, Peixoto S, Lima SS and Goldman J (1986) Determination of the sources of androgen overproduction in hirsutism associated with polycystic ovary syndrome by simultaneous adrenal and ovarian venous catheterization: comparison with the dexamethasone suppression test. J Clin Endocrinol Metab 63,1 11. Waldestreicher J, Santoro NF, Hall JE, Filicori M and Crowley WF Jr (1988) Hyperfunction of the hypothalamic-pituitary axis in women with polycystic ovary disease: indirect evidence for partial gonadotroph desensitization. J Clin Endocrinol Metab 66, Wiegratz I and Kuhl H () Managing cutaneous manifestations of hyperandrogenic disorders: the role of oral contraceptives. Treat Endocrinol 1, Submitted on February, 6; resubmitted on April, 6, April 7, 6; accepted on May 3, 6 5
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