Longitudinal bone growth ceases with growth plate senescence during puberty. However, the molecular mechanisms of this phenomenon are largely unexplored. Here, we examined Wnt-responsive genes before and after growth plate senescence and found that CXXC finger protein 5 (CXXC5), a negative regulator of the Wnt/β-catenin pathway, was gradually elevated with reduction of Wnt/β-catenin signaling during senescent changes of rodent growth plate. Cxxc5 2 / 2 mice demonstrated delayed growth plate senescence and tibial elongation. As CXXC5 functions by interacting with dishevelled (DVL), we sought to identify small molecules capable of disrupting this interaction. In vitro screening assay monitoring CXXC5–DVL interaction revealed that several indirubin analogs were effective antagonists of this interaction. A functionally improved indirubin derivative, KY19382, elongated tibial length through delayed senescence and further activation of the growth plate in adolescent mice. Collectively, our findings reveal an important role for CXXC5 as a suppressor of longitudinal bone growth involving growth plate activity.
Bibliographical noteFunding Information:
We thank W-U Kim and E-H Jho for providing cells and reagents. This work was supported by the National Research Foundation of Korea grant funded by the Korean Government (MSIP) (grants 2015R1A2A1A05001873, 2016R1A5A1004694, 2019R1A2C3002751). S Choi, H-Y Kim, P-H Cha, SH Seo, and W Shin were supported by a BK21 PLUS program.
© 2019 Choi et al.
All Science Journal Classification (ASJC) codes
- Biochemistry, Genetics and Molecular Biology (miscellaneous)
- Plant Science
- Health, Toxicology and Mutagenesis