IntroductionPolycystic ovary syndrome (PCOS) is one of the most common endocrinopathies found among 5%-10% of reproductive age women. It is a common cause of infertility due to anovulatory (1) and hyperandrogenism (2). The name of PCOS is based on ovarian morphological changes in women who suffer from menstrual disturbances and hyperandrogenism symptoms, so polycystic ovary morphology (PCOM) can be a notable feature of PCOS (3). PCOM is revealed by some ovarian morphological abnormalities such as polycystic and enlarged ovaries (4). Although many extra ovarian causes are raised in the pathophysiology of PCOS, ovarian dysfunction plays the most important role in this field (5). Although all women with PCOS are in risk of hormonal and glucose metabolism disturbances, insulin resistance, dyslipidemia, metabolic syndrome, cardiovascular disease, and endometrial hyperplasia (4), it seems that PCOS women with PCOM are in risk of elevated serum DHEA-S levels and also taking a higher daily dose of insulin in comparison to PCOS women without PCOM (6).There are many hypotheses for the etiology of PCOS (7), but the exact initiating event in the pathophysiology of the syndrome is not entirely clear and remains poorly understood. Since the study of pathophysiology or any manipulation for treatment of PCOS/PCOM in human faces some serious logistic and ethical limitations; animal modeling is a good choice to improve the understanding of the abstruse aspects of PCOS (8). Since the 1960s, many animal models such as rodents, sheep and nonhuman primates have been applied for this purpose. Using the mouse models can provide an all-purpose tool for studying and understanding the comprehensive biologic mechanisms of PCOS/PCOM. They have stable genetic backgrounds, shorter reproductive and estrous cycle and generation times, and reasonably priced. Besides, these models have shown same reproductive and metabolic conditions as human PCOS (9). Different procedures have been suggested to produce PCOS model including prenatal or pre-pubertal androgen exposure (10,11), aromatase inhibitor or estradiol administration (11-13), and transgenic models (11).
AbstractObjectives: Polycystic ovary syndrome (PCOS) is the most common endocrine disorder in women of reproductive age. Polycystic ovary (PCO) is a criterion for PCOS. Several animal models of polycystic ovary morphology (PCOM) are developed in order to study PCOS aspects. The present study aimed to develop a polycystic ovarian model in mice. Materials and Methods: Thirty-four young adult female mice were divided equally into estradiol valerate (EV) treated and control groups. Mice in experimental group (n = 18) received a single dose injection of EV (IM, 4 mg/kg). Weight and fertility rate of all mice were recorded. Morphology of ovarian follicles was assessed too. Chi-square and independent t test were used for comparison between groups. P value less than 0.05 was considered as significant level. Results: After 60 days, the weight of EV-treated mice was significantly lower than control (P ...