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J. Biol. Chem., Vol. 263, Issue 2, 740-744, 01, 1988
Stimulation by insulin of glucokinase gene transcription in liver of diabetic rats
PB Iynedjian, A Gjinovci and AE Renold
Institut de Biochimie Clinique, University of Geneva School of Medicine, Switzerland.
The purpose of this work was to investigate the molecular mechanism
responsible for the induction of hepatic glucokinase in diabetic rats
acutely treated with insulin. Experimental diabetes was provoked by
injection of streptozotocin 8-10 days before the experiments. Regular
insulin was given by three intraperitoneal injections at 8-h intervals, and
the time course of glucokinase induction was followed over a time period of
24 h. The amount of glucokinase in liver was estimated by Western blotting
of total cytosol protein with affinity-purified antibodies, as well as by
conventional enzyme activity assay. Both measurements showed that
glucokinase was reduced by more than 90% in the livers of diabetic rats as
compared to normal controls. Following insulin administration, the amount
(and activity) of glucokinase increased in a time-dependent fashion, after
an initial lag of 4 h, to reach 65% of the nondiabetic control level 24 h
after the initial dose of insulin. Northern blot analysis with a cloned
cDNA probe was used to quantitate glucokinase mRNA. In contrast with the
slow onset of enzyme accumulation, the amount of glucokinase mRNA was shown
to be increased dramatically as early as 1 h after insulin administration.
The abundance of specific mRNA increased until 8 h after the initial dose
of insulin. Subsequently, the level of the mRNA decayed rapidly so that
little message was left after 16 h and virtually none after 24 h. Run- on
transcription experiments with isolated nuclei showed that the rate of
transcription of the glucokinase gene was increased about 20-fold within 45
min of insulin administration and returned to the prestimulation level
after 8 h. From these data, it was concluded that the induction of
glucokinase resulted primarily from a burst in the transcriptional activity
of the gene, leading to a short-term accumulation of glucokinase mRNA. The
more sustained elevation of the enzyme level can be accounted for by the
long half-life of the enzyme (greater than 30 h). The virtually immediate
activation of glucokinase gene transcription suggests a direct effect of
insulin on the liver cell.

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Copyright © 1988 by the American Society for Biochemistry and Molecular Biology.
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