Evaluation of the metformin effects on Anti-Müllerian Hormone in women with polycystic ovarian syndrome: A double-blind randomized clinical trial

Abstract

Anti-Müllerian hormone (AMH) is made by the granulosa cells of preantral and small antral follicles which blocks the transition from the primordial to the primary follicular stage. Metformin may be associated with a decrease in AMH serum level and antral follicles in women who suffer from polycystic ovary syndrome (PCOs) It was reported that metformin in women with polycystic ovary syndrome (PCOs) is associated with a decrease in both AMH serum level and antral follicles. The objective of the current letter was the evaluation of the effects of metformin on hormonal profile of women with PCOs. In this prospective, randomized, doubleblind controlled clinical trial, 42 women (aged 17–45 yr) with PCOs who were randomly allocated to receive 500 mg Metformin orally three times a day or placebo for three months were included. Fasting plasma glucose, follicular stimulating hormone, luteinizing hormone (LH), prolactin (PRL), testosterone and AMH levels were measured at baseline and at the end of the period. In this study, independent and paired t-test were used for quantitative comparison and chi-square analysis for qualitative variables. Logistic regression analysis was done to identify independent risk factors, and Pvalue of lower than 0.05 were considered significant. All of the statistical analyses were done by SPSS software, version 20.0. We didn’t find any significant change after the study between treatment and control groups in hormonal profiles especially AMH. However, in subgroup analysis, we revealed that AMH and LH levels decreased significantly in normal weight patients (p= 0.024, 0.048, respectively) and prolactin levels in subgroup of overweight patients (p= 0.001). Moreover, patients in metformin group at the end of study had more regular menses, more weight loss, and lower hair loss (p= 0.001, 0.04, 0.014, respectively). Women with PCOs have elevated levels of LH that is secondary to increased sensitivity of pituitary to GnRH. Increased levels of LH lead to hyperandrogenism. Metformin can improve this condition. In this study, we observed that LH was decreased significantly in the metformin group of PCOs patients (p= 0.05). It is in agreement with some of the previous studies, however, De Leo and et al. reported a non-significant decrease in LH levels after treatment with metformin (1). Pieces of evidence showed that AMH levels in PCOs patients are 2 to 3 times higher than age-matched normal women (2), and this condition is a marker for PCOs and can be a surrogate test of hyperandrogenism (3). Metformin in our study improved the irregularity in the menstrual cycle (p< 0.001), hair loss (p= 0.014), and