Abstract
Serotonin robustly potentiated the activity of the InsP 3 3-kinase in rat brainstem slices. This potentiation was mediated through activation of 5-HT 2 receptors since it was only retrieved with the selective 5-HT 2 agonist DOI but not with the 5-HT 1A agonist 8OHDPAT. The enhancement of the InsP 3 3-kinase activity by serotonin is positively modulated by pretreatment of the slices with the phosphatase inhibitor okadaic acid. Moreover, the specific CaMKII antagonists KN-62 and KN-93 dramatically reduced the serotonin-evoked increase in the InsP 3 3-kinase activity. It is thus concluded that InsP 3 3-kinase up-regulation occurs through activation of PLC-coupled serotoninergic receptors and requires the phosphorylation of the enzyme by the ubiquitous multimeric protein kinase CaMKII.
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