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Pharmacologic Calcitriol Inhibits Osteoclast Lineage Commitment via the BMP‐Smad1 and IκB‐NF‐κB Pathways
Author(s) -
Li Anna,
Cong Qian,
Xia Xuechun,
Leong Wai Fook,
Yeh James,
Miao Dengshun,
Mishina Yuji,
Liu Huijuan,
Li Baojie
Publication year - 2017
Publication title -
journal of bone and mineral research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.882
H-Index - 241
eISSN - 1523-4681
pISSN - 0884-0431
DOI - 10.1002/jbmr.3146
Subject(s) - osteoclast , bone resorption , calcitriol , rankl , chemistry , calcitriol receptor , endocrinology , medicine , vitamin d and neurology , resorption , cancer research , receptor , microbiology and biotechnology , biology , activator (genetics)
Vitamin D is involved in a range of physiological processes and its active form and analogs have been used to treat diseases such as osteoporosis. Yet how vitamin D executes its function remains unsolved. Here we show that the active form of vitamin D calcitriol increases the peak bone mass in mice by inhibiting osteoclastogenesis and bone resorption. Although calcitriol modestly promoted osteoclast maturation, it strongly inhibited osteoclast lineage commitment from its progenitor monocyte by increasing Smad1 transcription via the vitamin D receptor and enhancing BMP‐Smad1 activation, which in turn led to increased IκBα expression and decreased NF‐κB activation and NFATc1 expression, with IκBα being a Smad1 target gene. Inhibition of BMP type I receptor or ablation of Bmpr1a in monocytes alleviated the inhibitory effects of calcitriol on osteoclast commitment, bone resorption, and bone mass augmentation. These findings uncover crosstalk between the BMP‐Smad1 and RANKL‐NF‐κB pathways during osteoclastogenesis that underlies the action of active vitamin D on bone health. © 2017 American Society for Bone and Mineral Research.