Hyperglycemia and insulin resistance: Possible mechanisms

Eva Tomás, Yen Shou Lin, Zeina Dagher, Asish Saha, Zhijun Luo, Yasuo Ido, Neil B. Ruderman

Research output: Contribution to journalArticle

84 Citations (Scopus)

Abstract

Sustained hyperglycemia impairs insulin-stimulated glucose utilization and glycogen synthesis in human and rat skeletal muscles, a phenomenon referred to clinically as glucose toxicity. In rat extensor digitorum longus (EDL) muscle preparations preincubated for 2-4 h in a hyperglycemic medium (25 mM vs. 0 mM glucose), we have shown that the ability of insulin to stimulate glucose incorporation into glycogen is impaired. Interestingly, this was associated with a decreased activation of Akt/PKB, but not its upstream regulator, PI3-kinase. A similar pattern of signaling abnormalities has been observed in adipocytes, L6 muscle cells, C2C12 cells, and (as reported here) EDL incubated with C2-ceramide. On the other hand, no increase was observed in ceramide mass in EDL incubated with 25 mM glucose. Hyperglycemia-induced insulin resistance also has been described in adipocytes, where it has been linked to activation of novel and conventional protein kinase C isoforms that phosphorylate the insulin receptor and IRS. In addition, we have recently shown that hyperglycemia causes insulin resistance in cultured human umbilical vein endothelial cells (HUVEC). Here, it was associated with an increased propensity to apoptosis and, as in muscle, with an impaired ability of insulin to activate Akt. Interestingly, these effects of hyperglycemia and an increase in diacylglycerol synthesis, which is also caused, were prevented by adding AICAR, an activator of AMP-activated protein kinase (AMPK), to the incubation medium. These results suggest that hyperglycemia causes insulin resistance in cells other than those in classic insulin target tissues. Whether AMPK activation can reverse or prevent insulin resistance in all of these cells remains to be determined.

Original languageEnglish
Pages (from-to)43-51
Number of pages9
JournalAnnals of the New York Academy of Sciences
Volume967
Publication statusPublished - 2002 Jan 1

Fingerprint

Hyperglycemia
Insulin Resistance
Insulin
Glucose
AMP-Activated Protein Kinases
Muscle
Glycogen
Adipocytes
Chemical activation
Muscles
Ceramides
Diglycerides
Insulin Receptor
Human Umbilical Vein Endothelial Cells
Rats
Phosphatidylinositol 3-Kinases
Muscle Cells
Protein Kinase C
Protein Isoforms
Skeletal Muscle

Keywords

  • AMP-protein kinase
  • Apoptosis
  • Ceramide
  • Endothelium
  • Muscle

ASJC Scopus subject areas

  • Neuroscience(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • History and Philosophy of Science

Cite this

Tomás, E., Lin, Y. S., Dagher, Z., Saha, A., Luo, Z., Ido, Y., & Ruderman, N. B. (2002). Hyperglycemia and insulin resistance: Possible mechanisms. Annals of the New York Academy of Sciences, 967, 43-51.

Hyperglycemia and insulin resistance : Possible mechanisms. / Tomás, Eva; Lin, Yen Shou; Dagher, Zeina; Saha, Asish; Luo, Zhijun; Ido, Yasuo; Ruderman, Neil B.

In: Annals of the New York Academy of Sciences, Vol. 967, 01.01.2002, p. 43-51.

Research output: Contribution to journalArticle

Tomás, E, Lin, YS, Dagher, Z, Saha, A, Luo, Z, Ido, Y & Ruderman, NB 2002, 'Hyperglycemia and insulin resistance: Possible mechanisms', Annals of the New York Academy of Sciences, vol. 967, pp. 43-51.
Tomás E, Lin YS, Dagher Z, Saha A, Luo Z, Ido Y et al. Hyperglycemia and insulin resistance: Possible mechanisms. Annals of the New York Academy of Sciences. 2002 Jan 1;967:43-51.
Tomás, Eva ; Lin, Yen Shou ; Dagher, Zeina ; Saha, Asish ; Luo, Zhijun ; Ido, Yasuo ; Ruderman, Neil B. / Hyperglycemia and insulin resistance : Possible mechanisms. In: Annals of the New York Academy of Sciences. 2002 ; Vol. 967. pp. 43-51.
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