The natural protective mechanism against hyperglycemia in vascular endothelial cells: roles of the lipid peroxidation product 4-hydroxydodecadienal and peroxisome proliferator-activated receptor delta.

Diabetes
Y RiahiS Sasson

Abstract

Vascular endothelial cells (VECs) downregulate their rate of glucose uptake in response to hyperglycemia by decreasing the expression of their typical glucose transporter GLUT-1. Hitherto, we discovered critical roles for the protein calreticulin and the arachidonic acid-metabolizing enzyme 12-lipoxygenase in this autoregulatory process. The hypothesis that 4-hydroxydodeca-(2E,6Z)-dienal (4-HDDE), the peroxidation product of 12-lipoxygenase, mediates this downregulatory mechanism by activating peroxisome proliferator-activated receptor (PPAR) delta was investigated. Effects of 4-HDDE and PPARdelta on the glucose transport system and calreticulin expression in primary bovine aortic endothelial cells were evaluated by pharmacological and molecular interventions. Using GW501516 (PPARdelta agonist) and GSK0660 (PPARdelta antagonist), we discovered that high-glucose-induced downregulation of the glucose transport system in VECs is mediated by PPARdelta. A PPAR-sensitive luciferase reporter assay in VECs revealed that high glucose markedly increased luciferase activity, while GSK0660 abolished it. High-performance liquid chromatography analysis showed that high-glucose incubation substantially elevated the generation of 4-HDDE in VEC...Continue Reading

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Methods Mentioned

BETA
immunoprecipitation
PCR
transfections
transfection
fluorescence microscopy
ChIP

Software Mentioned

Molinspiration Chemoinformatics
Clarity
Lite

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