dc.contributor.author | Singh, Rakesh K. | |
dc.contributor.author | Dai, Ying | |
dc.contributor.author | Staudinger, Jeffrey Leonard | |
dc.contributor.author | Muma, Nancy A. | |
dc.date.accessioned | 2014-07-22T14:26:14Z | |
dc.date.available | 2014-07-22T14:26:14Z | |
dc.date.issued | 2009-05 | |
dc.identifier.citation | Singh, Rakesh K. et al. (2009). Activation of the JAK-STAT pathway is necessary for desensitization of 5-HT2A receptor-stimulated phospholipase C signalling by olanzapine, clozapine and MDL 100907. International Journal of Neuropsychopharmacology 12(5):1461-1457. http://dx.doi.org/10.1017/S1461145708009590 | |
dc.identifier.issn | 1461-1457 | |
dc.identifier.uri | http://hdl.handle.net/1808/14808 | |
dc.description | This is the publisher's version, also available electronically from http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=5564880&fileId=S1461145708009590 | |
dc.description.abstract | We have previously demonstrated that olanzapine-induced desensitization of 5-HT2A receptor-stimulated phospholipase C (PLC) activity is associated with increases in RGS7 protein levels both in vivo and in cells in culture, and the increase in RGS7 is dependent on activation of the JAK-STAT pathway in cells in culture. In the present study, we found that desensitization of 5-HT2A receptor-stimulated PLC activity induced by olanzapine is dependent on activation of the JAK-STAT pathway. Similar to olanzapine, clozapine-induced desensitization of 5-HT2A receptor signalling is accompanied by increases in RGS7 and activation of JAK2. Treatment with the selective 5-HT2A receptor antagonist MDL 100907 also increased RGS7 protein levels and JAK2 activation. Using a JAK2 inhibitor AG490, we found that clozapine and MDL 100907-induced increases in RGS7 are dependent on activation of the JAK-STAT pathway. Olanzapine, clozapine, and MDL 100907 treatment increased mRNA levels of RGS7. Using a chromatin immunoprecipitation assay we found STAT3 binding to the putative RGS7 promoter region. Taken together, olanzapine-induced activation of the JAK-STAT pathway, and STAT3 binding to the RGS7 gene could underlie the increase in RGS7 mRNA which could subsequently increase protein expression. Furthermore, the increase in RGS7 protein could play a role in the desensitization of 5-HT2A receptor signalling by terminating the activated Gαq/11 proteins more rapidly. Overall, our data suggest that the complete desensitization of 5-HT2A receptor-stimulated PLC activity by olanzapine, clozapine and MDL 100907 requires activation of the JAK-STAT pathway, which in turn increases RGS7 expression probably by direct transcriptional activity of STAT3. | |
dc.publisher | Cambridge University Press | |
dc.subject | Clozapine | |
dc.subject | Desensitization | |
dc.subject | JAK-STAT | |
dc.subject | Olanzapine | |
dc.subject | 5-HT2A receptor | |
dc.title | Activation of the JAK-STAT pathway is necessary for desensitization of 5-HT2A receptor-stimulated phospholipase C signalling by olanzapine, clozapine and MDL 100907 | |
dc.type | Article | |
kusw.kuauthor | Staudinger, Jeff L. | |
kusw.kuauthor | Muma, Nancy A. | |
kusw.kudepartment | Pharmacology and Toxicology | |
dc.identifier.doi | 10.1017/S1461145708009590 | |
kusw.oaversion | Scholarly/refereed, publisher version | |
kusw.oapolicy | This item meets KU Open Access policy criteria. | |
dc.rights.accessrights | openAccess | |