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Mol. Cell. Biol., Feb 1997, 954-962, Vol 17, No. 2
RG Jain, LG Andrews, KM McGowan, PH Pekala and JD Keene
3T3-L1 preadipocytes ectopically expressing the mammalian RNA-binding
protein Hel-N1 expressed up to 10-fold more glucose transporter (GLUT1)
protein and exhibited elevated rates of basal glucose uptake. Hel-N1 is a
member of the ELAV-like family of proteins associated with the induction
and maintenance of differentiation in various species. ELAV proteins are
known to bind in vitro to short stretches of uridylates in the 3'
untranslated regions (3'UTRs) of unstable mRNAs encoding growth- regulatory
proteins involved in transcription and signal transduction. GLUT1 mRNA also
contains a large 3'UTR with a U-rich region that binds specifically to
Hel-N1 in vitro. Analysis of the altered GLUT1 expression at the
translational and posttranscriptional levels suggested a mechanism
involving both mRNA stabilization and accelerated formation of translation
initiation complexes. These findings are consistent with the hypothesis
that the Hel-N1 family of proteins modulate gene expression at the level of
mRNA in the cytoplasm.
Copyright © 1997, American Society for Microbiology
Ectopic expression of Hel-N1, an RNA-binding protein, increases glucose transporter (GLUT1) expression in 3T3-L1 adipocytes
Department of Biochemistry, School of Medicine, East Carolina University, Greenville, North Carolina 27834, USA.
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