Abstract
The effects of repeated controlled ovarian stimulation (COS) on the female reproductive system are still controversial. This study investigated the effects of repeated COS on the ovaries and uterus of mice and its possible mechanism. Female ICR (Institute of Cancer Research) mice were subjected to the COS using pregnant mare serum gonadotropin (PMSG) and human chorionic gonadotropin (hCG) for 1, 3, 5, and 7 cycles. Serum hormone levels, reactive oxidative stress (ROS), 8-hydroxy-2’-deoxyguanosine (8-OHdG), total antioxidant capacity (T-AOC), and superoxide dismutase (SOD) in the mouse ovary and uterus were analyzed by ELISA. The morphology of the ovary and endometrium, ovarian apoptosis, and expressions of the vascular endothelial growth factor (VEGF), leukemia inhibitory factor (LIF), PI3K, AKT, Bax, and Bcl-2 in the ovarian and uterine tissues were tested by hematoxylin–eosin (HE) staining, immunohistochemistry, and western blot. The results showed that repeated COS significantly decreased the hormone level (estradiol, progesterone and anti-Müllerian hormone), high-quality of the MII oocyte ratio, oocyte and embryo number, antioxidant capacity (T-AOC, SOD activity), and the protein level of Bcl-2, LIF, and VEGF, but increased the oxidative damage (ROS, 8-OHdG content), embryo fragment ratio, and expression of pro-apoptotic protein Bax. In addition, the expressions of p-PI3K and p-AKT also decreased with the increase of COS cycle. In conclusion, repeated COS causes ovarian and uterus damage possibly through the PI3K/AKT signaling pathway, and this finding may provide some experimental basis for guiding clinical treatment.
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Funding
This work was supported by the National Natural Science Foundation of China (No. 81774359, 82174419), Natural Science Foundation of Hebei Province (No. H2020423077), and the open projects of Hebei Key Laboratory of Integrative Medicine on Liver-kidney Patterns (No. A202104).
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HD and JC performed study design. SZ, YM, QZ, ML, ZY, YS, CS, HS, and GH collected the data of the experiment. SZ and YM supervised the study. SZ and YM prepared the figures. All authors validated the study. SZ and YM wrote the original paper. BG revised the paper.
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This study was approved by the Animal Ethics Committee of Hebei University of Chinese Medicine (No. DWLL2018036).
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Zhang, S., Ma, Y., Zuo, Q. et al. Repeated controlled ovarian stimulation-induced ovarian and uterine damage in mice through the PI3K/AKT signaling pathway. Human Cell 36, 234–243 (2023). https://doi.org/10.1007/s13577-022-00829-8
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DOI: https://doi.org/10.1007/s13577-022-00829-8