Abstract
Hormone support (estrogen and progesterone) is a key factor in decidualization and embryo implantation. Elevated levels of estrogen lead to luteal phase defects through Neuropilin 1, a membranecytoskeleton junction protein. This study aimed to explore the effect of BMSCs on endometrial stromal cells (ESCs) in adenomyosis. ESCs obtained from patients with adenomyosis were cocultured with BMSCs in the absence of presence of Neuropilin 1 inhibitor followed by analysis of expression of decidualization-related genes by RT-qPCR and western blot, cell viability by MTT assay, cell invasion and migration by Transwell assay, oxidative stress factors by ROS kit. Treatment with Neuropilin 1 inhibitor significantly decreased ESC proliferation and invasion, blocked epithelialmesenchymal transition (EMT) process, and restrained decidualization with a downregulation of decidualization-related genes. Furthermore, inhibition of Neuropilin 1 exerted effects through estrogen regulation. However, co-culture with BMSCs restored ESC activity by promoting Neuropilin expression and enhanced intrauterine ESC decidualization. In conclusion, Neuropilin 1 inhibitor restrains decidualization through estrogen regulation which can be abrogated by estrogen receptor antagonists. BMSCs restore the damaged ESC decidualization through increasing Neuropilin 1 expression, which provides new insights into the adverse effect of Neuropilin 1 on human ESCs, suggesting that BMSC is a potential therapeutic drug candidate for adenomyosis.
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