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Journal of Cell Science, Vol 111, Issue 21 3145-3156, Copyright © 1998 by Company of Biologists
JOURNAL ARTICLES |
U Atasoy, J Watson, D Patel and JD Keene
Departments of Microbiology, Immunology and Medicine, Duke University Medical Center, Durham, NC 27710 USA.
ELAV proteins are implicated in regulating the stability and translation of cytokine and growth regulatory mRNAs such as GM-CSF, IL-2, c-myc, c-fos and GLUT1 by binding to their AU-rich 3'UTRs. The tissue-specific ELAV protein HuB (aka. Hel-N1) is predominantly cytoplasmic and has been shown to stabilize GLUT1 and c-myc mRNAs and to increase their translation following ectopic expression in 3T3-L1 cells. We report that the most widely expressed mouse ELAV protein, mHuA, is predominately nuclear in cultured NIH-3T3 cells, but is localized in the cytoplasm during early G1 of the cell cycle. Therefore, much like the primarily cytoplasmic HuB, HuA becomes temporally localized in the cytoplasm where it can potentially regulate the stability or translation of bound mRNAs. Moreover, we report that stimulation of mouse spleen cells using either mitogenic or sub-mitogenic levels of anti-CD3/CD28 resulted in a dramatic increase in the level of HuA. Upregulation of HuA corresponds to previously documented increases in cytokine expression which are due to increased mRNA stability following T cell activation. Consistent with these findings, HuA was down regulated in quiescent cells and upregulated in 3T3 cells following serum stimulation. The increase of murine HuA during the cell cycle closely resembles that of cyclin B1 which peaks in G2/M. Together with our earlier studies, these data indicate that mammalian ELAV proteins function during cell growth and differentiation due in part to their effects on posttranscriptional stability and translation of multiple growth regulatory mRNAs. This supports the hypothesis that ELAV proteins can function as transacting factors which affect a default pathway of mRNA degradation involved in the expression of growth regulatory proteins.
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