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Peripheral serotonin-mediated system suppresses bone development and regeneration via serotonin 6 G-protein-coupled receptor.

Sci Rep. 2016 Sep 01;6:30985
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摘要


Serotonin is important in brain functions and involved in neurological diseases. It is also drawn considerable attention in bone disease since it mainly produced by the gut. Serotonin 6 G-protein-coupled receptor (5-HT6R) is clinical targets for the treatment of neurological diseases. However, 5-HT6R as a therapeutic target in bone has not been reported. Herein, we found that 5-HT6R showed higher expression in bone, and its expression was increased during bone remodeling and osteoblast differentiation. The activation of 5-HT6R by ST1936 caused the inhibition of ALP activity and mineralization in primary osteoblast cultures, which was antagonized by SB258585, an antagonist and by the knockdown of 5-HT6R. Further investigation indicated that 5-HT6R inhibited osteoblast differentiation via Jab1 in BMP2 signaling but not and ERK1/2. In vivo studies showed that the activation of 5-HT6R inhibited bone regeneration in the calvarial defect mice and also delayed bone development in newborn mice; this response was antagonized by SB258585. Therefore, our findings indicate a key role of 5-HT6R in bone formation through serotonin originating in the peripheral system, and suggest that it is a novel therapeutic target for drug development in the bone repair and bone diseases.

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