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Aminocoumarins, such as coumermycin A1 and novobiocin, are natural products of streptomycetes. They are potent inhibitors of bacterial DNA gyrase and are used to suppress the growth of bacteria in inflammatory diseases. However, their effect in osteoclastogenesis has not been investigated. In this study, using mouse bone-marrow-derived macrophages (BMMs), we showed that coumermycin A1 and novobiocin...
We investigated the interplay between parathyroid hormone (PTH) and phosphodiesterases (PDEs) in osteoblasts. PDE4 negatively regulated PTH-induced cAMP accumulation. PDE4 inhibitor enhanced PTH-induced osteoclast formation and RANKL mRNA expression, which is partially mediated by COX-2 mRNA expression. Two CRE sites in the COX-2 promoter were required for the increase in COX-2 transcription by PDE4...
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