PMID: 9437239Jan 23, 1998Paper

Insulin sensitizer YM268 ameliorates insulin resistance by normalizing the decreased content of GLUT4 in adipose tissue of obese Zucker rats

European Journal of Endocrinology
Akiyoshi ShimayaH Shikama

Abstract

Genetically obese Zucker rats exhibit mild hyperglycaemia and hyperinsulinaemia suggesting the existence of peripheral insulin resistance. We have examined the effects of YM268, an analogue of thiazolidinedione, on the content and translocation of a glucose transporter (GLUT4) in epididymal adipose tissue in 11-week-old obese and lean Zucker rats. The administration of YM268 at a dose of 10 mg/kg for 2 weeks ameliorated hyperglycaemia, hyperinsulinaemia, and impaired glucose tolerance after glucose load in obese rats. The GLUT4 content per fat pad in obese rats was reduced to 36% of that in lean littermates. Obese rats treated with YM268 increased GLUT4 concentrations in their fat pads from a basal value of 36% up to 191% of the level in lean rats. Furthermore, in adipocytes prepared from obese rats, an increase in the ratio of GLUT4 in plasma membrane to the total amount of GLUT4 (PM-GLUT4 ratio) induced by the submaximal concentration of insulin (0.3 nmol/l) was significantly attenuated compared with that in lean rats. But the maximum effect of insulin (3 nmol/l) was not attenuated. Meanwhile, YM268 had no significant effect on the attenuated PM-GLUT4 ratio in response to insulin in obese rats. These data suggested that one o...Continue Reading

Citations

Apr 12, 2002·Diabetes Research and Clinical Practice·Masahiko FurutaYukihiko Adachi
Jan 27, 1999·Biochemical and Biophysical Research Communications·Y NoguchiS Mitsuse
Mar 21, 2007·Pharmacological Research : the Official Journal of the Italian Pharmacological Society·Anil Bhanudas GaikwadPoduri Ramarao
Mar 28, 2003·American Journal of Physiology. Cell Physiology·Alex W CohenMichael P Lisanti
Dec 19, 2002·American Journal of Physiology. Endocrinology and Metabolism·Bella KalderonJacob Bar-Tana

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