RRC ID 68010
Author Shalhoub V, Grisanti M, Padagas J, Scully S, Rattan A, Qi M, Varnum B, Vezina C, Lacey D, Martin D.
Title In vitro studies with the calcimimetic, cinacalcet HCl, on normal human adult osteoblastic and osteoclastic cells.
Journal Crit Rev Eukaryot Gene Expr
Abstract This study examined whether the calcium-sensing receptor (CaR) is expressed in normal adult human osteoblastic and osteoclastic cells in culture, and whether the calcimimetic, cinacalcet HCl (AMG 073), potentiates the effects of calcium (via CaR, or some other receptor/mechanism). When mouse or human osteoblastic cells were treated with higher concentrations of calcium (6.6 or 8.6 mM in alpha-MEM/10% FBS) than present in control cultures (1.6 mM), the previously well-documented increase in cell number was demonstrated. Cinacalcet HCl affected cell proliferation of CHO cells transfected with CaR, dose dependently, but had no effect on human or mouse osteoblastic cell proliferation in calcium-containing medium (1.6 or 8.6 mM). To test cinacalcet HCl and calcium on osteoclastic cells, peripheral blood mononuclear cells were cultured in medium containing RANK ligand and M-CSF, supplemented with calcium, and/or cinacalcet HCl. Tartrate-resistant acid phosphatase-positive multinucleated osteoclastic cells on plastic or bone were then counted at 11 and 21 days, respectively. Calcium (greater than 6.0 mM) inhibited osteoclast formation, but cinacalcet HCl (30-1000 nM) had no effect on osteoclastic formation or resorption in the presence of calcium (1.6 or 6.1 mM). RT-PCR did not detect CaR in human, rat, or mouse primary osteoblastic cells and cell lines or osteoclastic cells. In conclusion, these studies indicate that the calcium-induced increase in osteoblastic cell number, and the decrease in formation/function of osteoclastic cells, involves a mechanism or receptor other than CaR. In addition, the calcimimetic agent did not potentiate the effects of calcium on normal adult human bone cells in vitro.
Volume 13(2-4)
Pages 89-106
Published 2003-1-1
DOI 10.1615/critreveukaryotgeneexpr.v13.i24.30
PMID 14696958
MeSH Animals Bone and Bones / drug effects CHO Cells Calcium / metabolism* Cell Division Cell Line Cells, Cultured Cinacalcet Cricetinae Culture Media / pharmacology Dose-Response Relationship, Drug Humans Immunohistochemistry Leukocytes, Mononuclear / metabolism Macrophage Colony-Stimulating Factor / metabolism Mice Naphthalenes / pharmacology* Osteoblasts / drug effects* Osteoclasts / drug effects* RNA, Messenger / metabolism Receptors, Calcium-Sensing / biosynthesis* Reverse Transcriptase Polymerase Chain Reaction Tissue Distribution Transfection
Human and Animal Cells Saos-2(RCB0428) ST2(RCB0224)