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The hyperosmotic stimulus is regarded as a mechanical factor for bone remodeling. However, whether the hyperosmotic stimulus affects 1alpha, 25-dihydroxyvitamin D(3) (1alpha,25(OH)(2)D(3))-induced osteoclastogenesis is not clear. In the present study, the effect of the hyperosmotic stimulus on 1alpha,25(OH)(2)D(3)-induced osteoclastogenesis was investigated in an osteoblast-preosteoclast co-culture system. Serial doses of sucrose were applied as a mechanical force. These hyperosmotic stimuli significantly evoked a reduced number of 1alpha,25(OH)(2)D(3)-induced tartrate-resistant acid phosphatase-positive multinucleated cells and 1alpha,25(OH)(2)D(3)-induced bone-resorbing pit area in a co-culture system. In osteoblastic cells, receptor activator of nuclear factor kappaB ligand (RANKL) and Runx2 expressions were down-regulated in response to 1alpha,25(OH)(2)D(3). Knockdown of Runx2 inhibited 1alpha,25(OH)(2)D(3)-induced RANKL expression in osteoblastic cells. Finally, the hyperosmotic stimulus induced the overexpression of TonEBP in osteoblastic cells. These results suggest that hyperosmolarity leads to the down-regulation of 1alpha,25(OH)(2)D(3)-induced osteoclastogenesis, suppressing Runx2 and RANKL expression due to the TonEBP overexpression in osteoblastic cells.

the korean journal of physiology and pharmacology/korean journal of physiology and pharmacology

Hyperosmotic Stimulus Down-regulates 1α, 25-dihydroxyvitamin D<sub>3</sub>-induced Osteoclastogenesis by Suppressing the RANKL Expression in a Co-culture System

Hyperosmotic Stimulus Down-regulates 1α, 25-dihydroxyvitamin D3-induced Osteoclastogenesis by Suppressing the RANKL Expression in a Co-culture System

Hyperosmotic Stimulus Down-regulates 1α, 25-dihydroxyvitamin D₃-induced Osteoclastogenesis by Suppressing the RANKL Expression in a Co-culture System