Bone morphogenetic protein 2 controls steroid-induced osteonecrosis of the femoral head via directly inhibiting interleukin-34 expression

Increased inflammatory response is one of the major characteristics of osteonecrosis of the femoral head (ONFH). We aimed to investigate the function of bone morphogenetic protein 2 (BMP-2)/interleukin (IL)-34 axis in the inflammatory responses of ONFH. The systemic and local expression of BMPs in ONFH patients was detected by qRT-PCR and ELISA. In vitro osteoclast differentiation and ONFH mouse models, induced by 20 mg/kg methylprednisolone through i.m. injection, were established using WT and BMP-2(-/-) mice to explore the regulatory role of BMP-2 in pro-inflammatory responses and bone defects of ONFH. IL-34 expression and function were examined in vitro and in vivo through qRT-PCR, tartrate-resistant acid phosphatase (TRAP) staining, and gene knockout. The systemic and local expression of BMPs was elevated in ONFH patients. BMP-2 reduced the production of pro-inflammatory cytokines and inhibited the differentiation of osteoclasts. Mechanistically, BMP-2 inhibited osteoclasts formation through suppressing IL-34 expression and then promoted bone repair and alleviated ONFH. In conclusion, our study reveals that BMP-2 inhibits inflammatory responses and osteoclast formation through downregulating IL-34.