Japan Society for the Promotion of Science:Grants-in-Aid for Scientific Research
Date (from‐to) : 2018/04 -2021/03
Author : Kito Hiroaki
In present study, we showed that KCa3.1 were functionally expressed in mouse preosteoblast MC3T3-E1, and the activation of KCa3.1 promoted the cell growth of MC3T3-E1 cells. To clarify the physiological function of KCa3.1 in MC3T3-E1 cells, contribution of KCa3.1 to VDR agonists-induced suppression of cell proliferation were examined. Treatments with VDR agonists markedly decreased the expression levels of KCa3.1 transcripts and proteins in MC3T3-E1 cells. Treatments with VDR agonists also significantly decreased the expression of several transcriptional regulators of KCa3.1 such as histone deacetylase 2 (HDAC2) and Fra-1 composed of activation protein 1. Our results suggest that KCa3.1 is a new downstream target of VDR signaling and the down-regulation of KCa3.1 through the transcriptional repression of KCa3.1 contribute, at least partly, to the antiproliferative effects of VDR agonists in mouse pre-osteoblasts.