期刊
EXPERIMENTAL CELL RESEARCH
卷 394, 期 1, 页码 -出版社
ELSEVIER INC
DOI: 10.1016/j.yexcr.2020.112137
关键词
PI3K; AKT; Wnt; Crosstalk; Fracture healing; Osteoblast
资金
- Incentive Research Program of Shangdong Provincial Hospital Affiliated to Shandong First Medical University, China
PI3K/AKT is one of the key pathways that regulate cell behaviors including apoptosis, proliferation, and differentiation. Although previous studies have demonstrated that this pathway is a crucial regulator of osteoblasts, the role of PI3K/AKT in fracture healing remains unclear. It is well known that the Wnt/beta-catenin pathway plays an essential role in bone regeneration. However, whether there exists crosstalk between Wnt/beta-catenin and PI3K/AKT in regulating osteoblasts and bone repair has not been reported. To address these issues, we establish a stabilized fracture model in mice and show that PI3K inhibitor LY294002 substantially inhibits the bone healing process, suggesting that PI3K/AKT promotes fracture repair. More importantly, we report that PI3K/AKT increases phosphorylation of GSK-3 beta at Ser9 and phosphorylation of beta-catenin at Ser552 in fracture callus and murine osteoblastic MC3T3-E1 cells, both of which lead to beta-catenin stabilization, nuclear translocation, as well as beta-catenin-mediated TCF-dependent transcription, suggesting that beta-catenin is activated downstream of PI3K/ AKT. Furthermore, we show that ICG001, the inhibitor of beta-catenin transcriptional activity, attenuates PI3K/AKT-induced osteoblast proliferation, differentiation, and mineralization, indicating that the PI3K/AKT/beta-catenin axis is functional in regulating osteoblasts. Notably, the PI3K/AKT pathway is also activated by Wnt3a and is involved in Wnt3a-induced osteoblast proliferation and differentiation. Hence, our results reveal the existence of a Wnt/PI3K/AKT/beta-catenin signaling nexus in osteoblasts, highlighting complex crosstalk between PI3K/AKT and Wnt/beta-catenin pathways that are critically implicated in fracture healing.
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