Akt phosphorylation of La regulates specific mRNA translation in glial progenitors Journal Article
| Authors: | Brenet, F.; Socci, N. D.; Sonenberg, N.; Holland, E. C. |
| Article Title: | Akt phosphorylation of La regulates specific mRNA translation in glial progenitors |
| Abstract: | The Akt signaling pathway activity increases as normal tissue progresses to malignant transformation, and regulates the translation of specific messenger RNAs (mRNAs) through multiple mechanisms. We have identified one such mechanism of Akt-dependent translation control as involving the lupus autoantigen La. La is an RNA-associated protein that contains multiple trafficking elements to support the interaction with RNAs in different subcellular locations. We show here that the La protein is a direct target of the serine/threonine protein kinase Akt on threonine 301, and La nuclear export in mouse glial progenitors, as well as its association with polysomes is modulated by Akt activity. Using a functional approach to determine the network of genes affected by La in the cytoplasm by microarray analysis of polysome-bound mRNAs, we found that La binds 34% of the polysome bound mRNAs and regulates the expression of a specific pool of mRNAs under KRas/Akt activation. Therefore, La appears to be an important contributor to Akt-mediated translational regulation of these transcripts in murine glial cells. © 2009 Macmillan Publishers Limited All rights reserved. |
| Keywords: | protein kinase b; protein expression; nonhuman; mouse; animals; mice; cell line; animal experiment; transcription, genetic; enzyme activation; protein serine threonine kinase; phosphorylation; experimental mouse; stem cell; cell transformation, neoplastic; messenger rna; rna, messenger; microarray analysis; oligonucleotide array sequence analysis; proto-oncogene proteins c-akt; murinae; rna translation; protein biosynthesis; la autoantigen; polysomes; ras/akt pathway; ribonomics; translation; autoantigen; cellular distribution; cytoplasm; glia cell; polysome; active transport, cell nucleus; autoantigens; neuroglia; oncogene protein p21(ras); polyribosomes; proto-oncogene proteins c-sis; ribonucleoproteins; stem cells |
| Journal Title: | Oncogene |
| Volume: | 28 |
| Issue: | 1 |
| ISSN: | 0950-9232 |
| Publisher: | Nature Publishing Group |
| Date Published: | 2009-01-08 |
| Start Page: | 128 |
| End Page: | 139 |
| Language: | English |
| DOI: | 10.1038/onc.2008.376 |
| PUBMED: | 18836485 |
| PROVIDER: | scopus |
| DOI/URL: | |
| Notes: | --- - "Cited By (since 1996): 3" - "Export Date: 30 November 2010" - "CODEN: ONCNE" - "Source: Scopus" |
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