ED-71 promotes osseointegration of titanium implants in a rat model of GIOP by alleviating the effects of dexamethasone on bone remodeling in a SIRT1-dependent manner.

OBJECTIVE: Glucocorticoid-induced osteoporosis (GIOP), a common complication of glucocorticoid usage, plays a critical role in the success of dental implant restoration by affecting osseointegration. Eldecalcitol (ED-71) prevents GIOP; however, its role in the osseointegration of implants under GIOP conditions remains elusive. METHODS: Dexamethasone was used to establish a rat model of GIOP. Subsequently, mini-implant surgery was performed on the femur. GIOP rats were administered ED-71 via gavage to assess its role in the osseointegration of titanium implants under GIOP conditions. MC3T3-E1 and RAW264.7 cells were utilized to explore the molecular mechanism of ED-71 in ameliorating disorder of bone remodeling caused by dexamethasone. RESULTS: The administration of ED-71 promoted the formation of newly formed woven bone and the resolution of inflammation around titanium implants. In vitro experiments indicated that ED-71 ameliorated dexamethasone-induced dysfunction of osteoblasts and osteoclasts by increasing the expression level of sirtuin 1 (SIRT1). Inhibition of SIRT1 by selisistat counteracts the regulatory effects of ED-71 on dexamethasone-induced disorder of bone remodeling. Molecular docking and Western blotting revealed that the neurogenic locus notch homolog protein and nuclear factor kappa B signaling pathways are essential for the effects of ED-71 on dexamethasone-induced disorder of bone remodeling. CONCLUSION: ED-71 promoted implant osseointegration in a rat model of GIOP by alleviating the effects of dexamethasone on bone remodeling in a SIRT1-dependent manner.