Methylglyoxal impairs insulin signalling and insulin action on glucose-induced insulin secretion in the pancreatic beta cell line INS-1E

F. Fiory, Angela Lombardi, C. Miele, J. Giudicelli, F. Beguinot, E. Van Obberghen

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

Aims/hypothesis: Chronic hyperglycaemia aggravates insulin resistance, at least in part, by increasing the formation of advanced glycation end-products (AGEs). Methylglyoxal (MGO) is the most reactive AGE precursor and its abnormal accumulation participates in damage in various tissues and organs. Here we investigated the ability of MGO to interfere with insulin signalling and to affect beta cell functions in the INS-1E beta cell line. Methods: INS-1E cells were incubated with MGO and then exposed to insulin or to glucose. Western blotting was used to study signalling pathways, and real-time PCR to analyse gene expression; insulin levels were determined by radioimmunoassay. Results: Non-cytotoxic MGO concentrations inhibited insulin-induced IRS tyrosine phosphorylation and phosphatidylinositol 3-kinase (PI3K)/protein kinase B (PKB) pathway activation independently from reactive oxygen species (ROS) production. Concomitantly, formation of AGE adducts on immunoprecipitated IRS was observed. Aminoguanidine reversed MGO inhibitory effects and the formation of AGE adducts on IRS. Further, the insulin- and glucose-induced expression of Ins1, Gck and Pdx1 mRNA was abolished by MGO. Finally, MGO blocked glucose-induced insulin secretion and PI3K/PKB pathway activation. These MGO effects were abolished by LiCl, which inhibits glycogen synthase kinase-3 (GSK-3). Conclusions/ interpretation: MGO exerted major damaging effects on INS-1E cells impairing both insulin action and secretion. An important actor in these noxious MGO effects appears to be GSK-3. In conclusion, MGO participates not only in the pathogenesis of the debilitating complications of type 2 diabetes, but also in worsening of the diabetic state by favouring beta cell failure.

Original languageEnglish (US)
Pages (from-to)2941-2952
Number of pages12
JournalDiabetologia
Volume54
Issue number11
DOIs
StatePublished - Nov 1 2011
Externally publishedYes

Fingerprint

Pyruvaldehyde
Insulin-Secreting Cells
Insulin
Glucose
Cell Line
Advanced Glycosylation End Products
Phosphatidylinositol 3-Kinase
Glycogen Synthase Kinase 3
Proto-Oncogene Proteins c-akt
Hyperglycemia
Type 2 Diabetes Mellitus
Radioimmunoassay
Tyrosine
Insulin Resistance
Real-Time Polymerase Chain Reaction
Reactive Oxygen Species
Western Blotting

Keywords

  • Beta cell line
  • GSK-3
  • INS-1E
  • Insulin secretion
  • Insulin signalling
  • Methylglyoxal

ASJC Scopus subject areas

  • Internal Medicine
  • Endocrinology, Diabetes and Metabolism

Cite this

Methylglyoxal impairs insulin signalling and insulin action on glucose-induced insulin secretion in the pancreatic beta cell line INS-1E. / Fiory, F.; Lombardi, Angela; Miele, C.; Giudicelli, J.; Beguinot, F.; Van Obberghen, E.

In: Diabetologia, Vol. 54, No. 11, 01.11.2011, p. 2941-2952.

Research output: Contribution to journalArticle

Fiory, F. ; Lombardi, Angela ; Miele, C. ; Giudicelli, J. ; Beguinot, F. ; Van Obberghen, E. / Methylglyoxal impairs insulin signalling and insulin action on glucose-induced insulin secretion in the pancreatic beta cell line INS-1E. In: Diabetologia. 2011 ; Vol. 54, No. 11. pp. 2941-2952.
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AU - Lombardi, Angela

AU - Miele, C.

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AU - Beguinot, F.

AU - Van Obberghen, E.

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