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Biochem J. 1998 Dec 1; 336(Pt 2): 405–411.
PMCID: PMC1219885

Regulation of gene expression by alternative polyadenylation and mRNA instability in hyperglycaemic mesangial cells.

Abstract

We have used mRNA differential display to identify a novel high-glucose-regulated gene (HGRG-14) in human mesangial cells cultured for up to 21 days in 30 mM d-glucose. The mRNA of HGRG-14 seems to be regulated post-transcriptionally and encodes a small polypeptide of molecular mass 13 kDa. The native protein occurs as a dimer. The recombinant protein is a substrate for casein kinase II kinase. At high glucose concentrations, HGRG-14 protein levels decrease. This correlates with the appearance of a long form of HGRG-14 mRNA under high-glucose conditions. This form has a long 3' untranslated region containing several ATTTA RNA-destabilizing sequences and has a short half-life. A truncated, more stable mRNA that lacks the long 3' untranslated region is produced at 4 mM d-glucose. The switch from the truncated to the long-form transcript is detected within 2 h of exposure to 30 mM d-glucose, indicating that hyperglycaemic conditions have an acute effect on HGRG-14 mRNA processing.

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Selected References

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