Regulation of Akt(ser473) phosphorylation by Choline kinase in breast carcinoma cells
<p>Abstract</p> <p>Background</p> <p>The serine/threonine kinase PKB/Akt plays essential role in various cellular processes including cell growth and proliferation, metabolism and cell survival. The importance of the Akt pathway is highlighted by the mutation of various...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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BMC
2009-12-01
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| Series: | Molecular Cancer |
| Online Access: | http://www.molecular-cancer.com/content/8/1/131 |
| _version_ | 1818381456914776064 |
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| author | Ullrich Axel de Molina Ana Gallego-Ortega David Chua Boon Lacal Juan Downward Julian |
| author_facet | Ullrich Axel de Molina Ana Gallego-Ortega David Chua Boon Lacal Juan Downward Julian |
| author_sort | Ullrich Axel |
| collection | DOAJ |
| description | <p>Abstract</p> <p>Background</p> <p>The serine/threonine kinase PKB/Akt plays essential role in various cellular processes including cell growth and proliferation, metabolism and cell survival. The importance of the Akt pathway is highlighted by the mutation of various components of the pathway such as the PTEN and PI3-kinase (P110α) in human cancers. In this paper, we employed an RNA interference library targeting all human kinases to screen for kinases involved in the regulation of Akt activation, in particular serine 473 phosphorylation. Here, we transfected the MDA-MB 468 breast cell line with the human kinome siRNA library and measured Akt activation using an antibody specific for phosphoserine 473 of Akt.</p> <p>Results</p> <p>The screen revealed that phosphorylation of Akt(ser473) can be regulated by more than 90 kinases. Interestingly, phosphorylation of Akt(ser473), but not thr308, can be severely reduced by inhibition of Choline kinase activity <it>via </it>siRNA or small molecule inhibitors. We show here that the regulation of Akt phosphorylation by Choline kinase is PI3K-independent. In addition, xenograft tumors treated with Choline kinase inhibitors demonstrated a statistically significant decrease in Akt(ser473) phosphorylation. Importantly, the reduction in phosphorylation correlates with regression of these xenograft tumors in the mouse model.</p> <p>Conclusion</p> <p>High Choline kinase expression and activity has previously been implicated in tumor development and metastasis. The mechanism by which Choline kinase is involved in tumor formation is still not fully resolved. From our data, we proposed that Choline kinase plays a key role in regulating Akt(ser473) phosphorylation, thereby promoting cell survival and proliferation.</p> |
| first_indexed | 2024-12-14T02:34:52Z |
| format | Article |
| id | doaj.art-33b50a2cfc854f5cbacf896ed26b9d91 |
| institution | Directory Open Access Journal |
| issn | 1476-4598 |
| language | English |
| last_indexed | 2024-12-14T02:34:52Z |
| publishDate | 2009-12-01 |
| publisher | BMC |
| record_format | Article |
| series | Molecular Cancer |
| spelling | doaj.art-33b50a2cfc854f5cbacf896ed26b9d912022-12-21T23:20:09ZengBMCMolecular Cancer1476-45982009-12-018113110.1186/1476-4598-8-131Regulation of Akt(ser473) phosphorylation by Choline kinase in breast carcinoma cellsUllrich Axelde Molina AnaGallego-Ortega DavidChua BoonLacal JuanDownward Julian<p>Abstract</p> <p>Background</p> <p>The serine/threonine kinase PKB/Akt plays essential role in various cellular processes including cell growth and proliferation, metabolism and cell survival. The importance of the Akt pathway is highlighted by the mutation of various components of the pathway such as the PTEN and PI3-kinase (P110α) in human cancers. In this paper, we employed an RNA interference library targeting all human kinases to screen for kinases involved in the regulation of Akt activation, in particular serine 473 phosphorylation. Here, we transfected the MDA-MB 468 breast cell line with the human kinome siRNA library and measured Akt activation using an antibody specific for phosphoserine 473 of Akt.</p> <p>Results</p> <p>The screen revealed that phosphorylation of Akt(ser473) can be regulated by more than 90 kinases. Interestingly, phosphorylation of Akt(ser473), but not thr308, can be severely reduced by inhibition of Choline kinase activity <it>via </it>siRNA or small molecule inhibitors. We show here that the regulation of Akt phosphorylation by Choline kinase is PI3K-independent. In addition, xenograft tumors treated with Choline kinase inhibitors demonstrated a statistically significant decrease in Akt(ser473) phosphorylation. Importantly, the reduction in phosphorylation correlates with regression of these xenograft tumors in the mouse model.</p> <p>Conclusion</p> <p>High Choline kinase expression and activity has previously been implicated in tumor development and metastasis. The mechanism by which Choline kinase is involved in tumor formation is still not fully resolved. From our data, we proposed that Choline kinase plays a key role in regulating Akt(ser473) phosphorylation, thereby promoting cell survival and proliferation.</p>http://www.molecular-cancer.com/content/8/1/131 |
| spellingShingle | Ullrich Axel de Molina Ana Gallego-Ortega David Chua Boon Lacal Juan Downward Julian Regulation of Akt(ser473) phosphorylation by Choline kinase in breast carcinoma cells Molecular Cancer |
| title | Regulation of Akt(ser473) phosphorylation by Choline kinase in breast carcinoma cells |
| title_full | Regulation of Akt(ser473) phosphorylation by Choline kinase in breast carcinoma cells |
| title_fullStr | Regulation of Akt(ser473) phosphorylation by Choline kinase in breast carcinoma cells |
| title_full_unstemmed | Regulation of Akt(ser473) phosphorylation by Choline kinase in breast carcinoma cells |
| title_short | Regulation of Akt(ser473) phosphorylation by Choline kinase in breast carcinoma cells |
| title_sort | regulation of akt ser473 phosphorylation by choline kinase in breast carcinoma cells |
| url | http://www.molecular-cancer.com/content/8/1/131 |
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