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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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To determine the regulatory roles of phosphodiesterase (PDE) inhibitors on $PGE_2$-induced osteoclastogenesis, we investigated the effect of PDE inhibitors on osteoclast formation in the presence of $PGE_2$. Among PDE isozyme specific inhibitors, milrinone, a selective PDE3 inhibitor, and rolipram, a specific PDE4 inhibitor, increased $PGE_2$-induced osteoclast formation in cocultures of mouse bone marrow cells and osteoblasts. To verify that whether the PDE3 and PDE4 inhibitors act indirectly on osteoblasts, we measured the concentration of intracellular cAMP in osteoblasts. Treatment of milrinone or rolipram increased $PGE_2$-stimulated cAMP levels in osteoblasts. Furthermore, northern blot analysis revealed that the PDE3 and PDE4 inhibitors works synergistically with $PGE_2$ to increase the expression of TRANCE mRNA in osteoblasts. On the contrary, the PDE3 and PDE4 inhibitors did not augment the number of osteoclasts differentiated from bone marrow cells by $PGE_2$. In conclusion, the stimulation of $PGE_2$-induced osteoclast formation by the PDE3 and PDE4 inhibitors are attributable to their indirect effect on osteoblasts, not to their direct effect on bone marrow-derived osteoclast precursors.
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