TY - JOUR T1 - CXXC5 mediates growth plate senescence and is a target for enhancement of longitudinal bone growth JF - Life Science Alliance JO - Life Sci. Alliance DO - 10.26508/lsa.201800254 VL - 2 IS - 2 SP - e201800254 AU - Sehee Choi AU - Hyun-Yi Kim AU - Pu-Hyeon Cha AU - Seol Hwa Seo AU - Chulho Lee AU - Yejoo Choi AU - Wookjin Shin AU - Yunseok Heo AU - Gyoonhee Han AU - Weontae Lee AU - Kang-Yell Choi Y1 - 2019/04/01 UR - https://www.life-science-alliance.org/content/2/2/e201800254.abstract N2 - 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−/− 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. ER -