Ming-Jie Kuang1, Fei Xing2, Dachuan Wang3, Lei Sun2, Jian-Xiong Ma2, Xin-Long Ma4. 1. Department of Orthopedics, Tianjin Medical University General Hospital, Tianjin, 300052, People's Republic of China. 2. Tianjin Hospital, Tianjin, 300211, People's Republic of China. 3. Department of Orthopedics, The Provincial Hospital Affiliated to Shandong University, Shandong, 250014, People's Republic of China. 4. Department of Orthopedics, Tianjin Medical University General Hospital, Tianjin, 300052, People's Republic of China. Electronic address: maxinlong8686@126.com.
Abstract
PURPOSE: large doses of glucocorticoids (GCs) are the most common cause of glucocorticoid-induced osteonecrosis of femoral head (GIONFH). Although awareness of GIONFH among patients with GCs history has increased over recent years, several studies indicate that its mechanism remains unclear. METHODS: To evaluate the function of circUSP45 in GIONFH, femoral heads in GIONFH patients or femoral heads in fracture patients were collected. In vitro, RT-PCR, FISH, RNA pull down and Western blotting assay were used to evaluate the function of circUSP45. In addition, we also verified the effects of circUSP45 on osteogenesis using alizarin red staining. In vivo, we used HE staining and microCT analysis to evaluate the bone mass. Moreover, the mechanism of circUSP45 regulating osteogenesis through the miR-127-5p/PTEN/AKT pathway was also investigated. RESULTS: The results showed that expression of circUSP45 increased in GIONFH patients. The overexpression of circUSP45 decreases osteogenic gene expression and inhibits the proliferation of BMSCs. Furthermore, circUSP45 was located mainly in the cytoplasm and directly interacted with miR-127-5p. MiR-127-5p acts with its targets PTEN to regulate the osteogenesis. MicroCT and HE staining verify the function of circUSP45 in GIONFH rat model. CONCLUSION: CircUSP45 decreases osteogenesis in bone GIONFH by sponging miR-127-5p through PTEN/AKT signal pathway.
PURPOSE: large doses of glucocorticoids (GCs) are the most common cause of glucocorticoid-induced osteonecrosis of femoral head (GIONFH). Although awareness of GIONFH among patients with GCs history has increased over recent years, several studies indicate that its mechanism remains unclear. METHODS: To evaluate the function of circUSP45 in GIONFH, femoral heads in GIONFH patients or femoral heads in fracturepatients were collected. In vitro, RT-PCR, FISH, RNA pull down and Western blotting assay were used to evaluate the function of circUSP45. In addition, we also verified the effects of circUSP45 on osteogenesis using alizarin red staining. In vivo, we used HE staining and microCT analysis to evaluate the bone mass. Moreover, the mechanism of circUSP45 regulating osteogenesis through the miR-127-5p/PTEN/AKT pathway was also investigated. RESULTS: The results showed that expression of circUSP45 increased in GIONFH patients. The overexpression of circUSP45 decreases osteogenic gene expression and inhibits the proliferation of BMSCs. Furthermore, circUSP45 was located mainly in the cytoplasm and directly interacted with miR-127-5p. MiR-127-5p acts with its targets PTEN to regulate the osteogenesis. MicroCT and HE staining verify the function of circUSP45 in GIONFH rat model. CONCLUSION: CircUSP45 decreases osteogenesis in bone GIONFH by sponging miR-127-5p through PTEN/AKT signal pathway.