Effects of menstrual blood‑derived stem cells on endometrial injury repair

The present study aimed to investigate the effects of menstrual blood‑derived stem cells (MenSCs) on endometrial injury repair. MenSCs were isolated from human menstrual blood and were cultured in vitro. Flow cytometric analysis of cells in the third generation demonstrated that MenSCs exhibited higher expression levels of cluster of differentiation (CD)90 and lower expression levels of CD146, which suggested that the MenSCs were cultured successfully. A mechanical damage model of unilateral (right) endometrium was established in BALB/c nude mice, which were divided into four groups, Normal, negative control (NC), Model and MenSC. MenSCs transfected with adenovirus‑enhanced green fluorescent protein were transplanted into the right uterine cavity of mice in the MenSC and NC groups. The protein expression levels of keratin, vimentin, and vascular endothelial growth factor (VEGF) and the average endometrial thickness were measured by immunohistochemistry; the average optical density of vimentin, VEGF and keratin in the MenSC‑treated group was significantly higher compared with the untreated Model group. Fertility tests were performed to determine the pregnancy rate of each group; following endometrial damage in BALB/c nude mice, endometrial thickness was decreased in the Model group, whereas model mice treated with MenSC exhibited increased endometrial thickness and increased the pregnancy rates. Therefore, MenSCs may promote the repair of endometrial lesions in mice by promoting the expression of vimentin, VEGF and keratin.