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This study focuses on the molecular regulatory mechanism of bone loss after menopause and explores the feedback regulatory effect of the C/EBPβ/AEP pathway on the bone resorption mediated by FSHβ. The study confirmed that C/EBPβ can act as a transcription factor for the fshb gene and mediate its transcription process. Blocking the AEP/C/EBPβ pathway can inhibit the expression of FSHβ, thereby alleviating osteoporosis induced by ovariectomy and clarifying the core role of this pathway in the regulation of bone metabolism after menopause.
01 Research Background
After menopause, the level of follicle-stimulating hormone (FSH) in the body is abnormally elevated. This hormone can activate its corresponding receptor and enhance the bone resorption effect of osteoclasts, leading to bone loss. Previous studies have found that FSH can activate the C/EBPβ/AEP pathway and participate in the process of neurodegenerative diseases, but it has not been clearly elucidated whether this pathway can feedback regulate the bone resorption process mediated by FSHβ. This has become a key issue to be resolved in the study of the mechanism of bone metabolism after menopause.
02 Main Content
The study clarified the transcriptional regulatory function of C/EBPβ on the fshb gene and verified its direct binding to the promoter of the fshb gene and its role in mediating the transcription of FSHβ in the pituitary gland; it explored the effect of changes in C/EBPβ expression levels on the expression of FSHβ; it analyzed the regulatory effect of AEP inactivation on the function of C/EBPβ and the level of FSHβ, as well as the impact of this regulatory effect on osteoporosis induced by ovariectomy, and systematically analyzed the regulatory mechanism of the AEP/C/EBPβ pathway in bone metabolism after menopause.
03 Research Design
An in vitro experimental system was established using primary pituitary cells. The effect of C/EBPβ knockdown on GnRH-induced FSHβ expression was detected; a knockout mouse model of C/EBPβ and AEP genes was constructed to detect changes in FSHβ levels in vivo; an animal model of osteoporosis induced by ovariectomy was established, and the intervention with AEP small molecule inhibitors was conducted to analyze the improvement effect of pathway blockade on bone loss.
04 Results
C/EBPβ can act as a transcription factor for the fshb gene and directly bind to its promoter to mediate the mRNA transcription of FSHβ in the pituitary gland; knocking down C/EBPβ in primary pituitary cells will weaken the FSHβ expression induced by GnRH, and C/EBPβ knockout in mice can reduce the FSHβ level; AEP inactivation can antagonize the function of C/EBPβ and inhibit the FSHβ level, effectively alleviating osteoporosis induced by ovariectomy; a specific AEP inhibitor shows ideal intervention effects in this osteoporosis model.
05 Extension of Thoughts
Further in-depth analysis of the upstream and downstream molecular interactions of the AEP/C/EBPβ/FSHβ pathway can clarify the complete molecular mechanism of this pathway in bone metabolism regulation; exploring the role of this pathway in other abnormal bone metabolism models can expand its application scope in basic research on bone metabolism; based on the key molecules of this pathway, developing more targeted experimental intervention tools can improve the molecular regulatory research system for bone metabolism after menopause.
