Purpose - Animal models offer a useful way to study the reproductive and metabolic abnormalities, including PCOS. MSCs have received increasing attention as a potential cell-based therapy and regenerative medicine, due to their effects in modulation of different molecular and biological pathways. The aims of the present work were to investigate modulation of the ovarian microenvironment by AdMSCs in an animal model induced to PCOS. Methods - Female rats were divided into control, polycystic ovary, and mesenchymal stem cell groups, evaluated at two different times after PCOS induction and injection of AdMSCs. Results - The polycystic ovary group showed changes in ovarian cycles, the presence of cysts in the ovaries, and hyperandrogenemia. In addition, changes in plasma insulin, glucose, leptin, and osteocalcin were observed in the polycystic ovary group. These metabolic changes were modulated by the injection of AdMSCs into the ovary. Data are presented for female rats in an animal model integrating PCOS with AdMSCs, together with the relationships among ovaries, bones, and adipocytes. Conclusion - The results suggested the existence of endocrine-metabolic-reproductive microenvironment relationships modulated by AdMSCs, which should help in guiding further investigations to clarify pathophysiological mechanisms that have not yet been fully elucidated.