Increased Ca2+ signaling through CaV1.2 promotes bone formation and prevents estrogen deficiency-induced bone loss.

Published

Journal Article

While the prevalence of osteoporosis is growing rapidly with population aging, therapeutic options remain limited. Here, we identify potentially novel roles for CaV1.2 L-type voltage-gated Ca2+ channels in osteogenesis and exploit a transgenic gain-of-function mutant CaV1.2 to stem bone loss in ovariectomized female mice. We show that endogenous CaV1.2 is expressed in developing bone within proliferating chondrocytes and osteoblasts. Using primary BM stromal cell (BMSC) cultures, we found that Ca2+ influx through CaV1.2 activates osteogenic transcriptional programs and promotes mineralization. We used Prx1-, Col2a1-, or Col1a1-Cre drivers to express an inactivation-deficient CaV1.2 mutant in chondrogenic and/or osteogenic precursors in vivo and found that the resulting increased Ca2+ influx markedly thickened bone not only by promoting osteogenesis, but also by inhibiting osteoclast activity through increased osteoprotegerin secretion from osteoblasts. Activating the CaV1.2 mutant in osteoblasts at the time of ovariectomy stemmed bone loss. Together, these data highlight roles for CaV1.2 in bone and demonstrate the potential dual anabolic and anticatabolic therapeutic actions of tissue-specific CaV1.2 activation in osteoblasts.

Full Text

Duke Authors

Cited Authors

  • Cao, C; Ren, Y; Barnett, AS; Mirando, AJ; Rouse, D; Mun, SH; Park-Min, K-H; McNulty, AL; Guilak, F; Karner, CM; Hilton, MJ; Pitt, GS

Published Date

  • November 16, 2017

Published In

Volume / Issue

  • 2 / 22

PubMed ID

  • 29202453

Pubmed Central ID

  • 29202453

Electronic International Standard Serial Number (EISSN)

  • 2379-3708

International Standard Serial Number (ISSN)

  • 2379-3708

Digital Object Identifier (DOI)

  • 10.1172/jci.insight.95512

Language

  • eng