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The two major glucokinase isoforms show conserved functionality in β-cells despite different subcellular

Brian Lu1,2, Miguel Munoz-Gomez1, Yasuhiro Ikeda1,2

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Biological Chemistry
|March 25, 2018
PubMed
Summary

Glucokinase (GCK) isoforms, hepatic and pancreatic, show functional conservation despite distinct subcellular localization. Overexpression of either GCK isoform enhances glucose uptake and beta-cell proliferation, suggesting similar roles in glucose metabolism.

Keywords:
glucokinaseisoformβ-cell

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Endocrinology

Background:

  • Glucokinase (GCK) is a key enzyme regulating glucose metabolism in the liver and pancreatic beta-cells.
  • Two major GCK isoforms, hepatic and pancreatic, differ in exon 1, but their functional distinctions are unclear.

Purpose of the Study:

  • To investigate the functional impact of isoform-specific GCK overexpression on beta-cells.
  • To determine the in vitro and in vivo effects of hepatic and pancreatic GCK isoforms.

Main Methods:

  • Utilized a beta-cell-targeted gene transfer vector for isoform-specific GCK overexpression.
  • Assessed glucose uptake, beta-cell proliferation, fasting glucose levels, and intraperitoneal glucose tolerance tests (IPGTT) in vitro and in vivo.
  • Analyzed human GCK sequences for variant and mutation distribution.

Main Results:

  • Pancreatic GCK possesses a unique nuclear localization signal, leading to distinct subcellular distribution.
  • Overexpression of both GCK isoforms similarly enhanced glucose uptake and beta-cell proliferation in vitro.
  • Both hepatic and pancreatic GCK overexpression promoted beta-cell proliferation in mice without altering glucose homeostasis.
  • GCK variants were disproportionally found in exon 1, while MODY2 mutations were concentrated in later exons.

Conclusions:

  • The two major GCK isoforms exhibit functional conservation despite differences in subcellular localization.
  • Isoform-specific GCK overexpression demonstrates similar effects on beta-cell function and proliferation.
  • Exon 1 differences do not significantly impair the primary metabolic functions of GCK isoforms.