RGD Reference Report - High glucose via peroxynitrite causes tyrosine nitration and inactivation of prostacyclin synthase that is associated with thromboxane/prostaglandin H(2) receptor-mediated apoptosis and adhesion molecule expression in cultured human aortic endothelial cells. - Rat Genome Database

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High glucose via peroxynitrite causes tyrosine nitration and inactivation of prostacyclin synthase that is associated with thromboxane/prostaglandin H(2) receptor-mediated apoptosis and adhesion molecule expression in cultured human aortic endothelial cells.

Authors: Zou, Ming-Hui  Shi, Chaomei  Cohen, Richard A 
Citation: Zou MH, etal., Diabetes. 2002 Jan;51(1):198-203. doi: 10.2337/diabetes.51.1.198.
RGD ID: 401960102
Pubmed: PMID:11756341   (View Abstract at PubMed)
DOI: DOI:10.2337/diabetes.51.1.198   (Journal Full-text)

Loss of the modulatory role of the endothelium may be a critical initial factor in the development of diabetic vascular diseases. Exposure of human aortic endothelial cells (HAECs) to high glucose (30 or 44 mmol/l) for 7-10 days significantly increased the release of superoxide anion in response to the calcium ionophore A23187. Nitrate, a breakdown product of peroxynitrite (ONOO(-)), was substantially increased in parallel with a decline in cyclic guanosine monophosphate (GMP). Using immunochemical techniques and high-performance liquid chromatography, an increase in tyrosine nitration of prostacyclin (PGI(2)) synthase (PGIS) associated with a decrease in its activity was found in cells exposed to high glucose. Both the increase in tyrosine nitration and the decrease in PGIS activity were lessened by decreasing either nitric oxide or superoxide anion, suggesting that ONOO(-) was responsible. Furthermore, SQ29548, a thromboxane/prostaglandin (PG) H(2) (TP) receptor antagonist, significantly reduced the increased endothelial cell apoptosis and the expression of soluble intercellular adhesion molecule-1 that occurred in cells exposed to high glucose, without affecting the decrease in PGIS activity. Thus, exposure of HAECs to high glucose increases formation of ONOO(-), which causes tyrosine nitration and inhibition of PGIS. The shunting of arachidonic acid to the PGI(2) precursor PGH(2) or other eicosanoids likely results in TP receptor stimulation. These observations can explain several abnormalities in diabetes, including 1) increased free radicals, 2) decreased bioactivity of NO, 3) PGI(2) deficiency, and 4) increased vasoconstriction, endothelial apoptosis, and inflammation via TP receptor stimulation.



Gene-Chemical Interaction Annotations    Click to see Annotation Detail View

  
Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
PTGISHumanglucose decreases activityEXP Glucose decreases activity of PTGIS protein in aortic endothelial cellsRGD 
PtgisRatglucose decreases activityISOPTGIS (Homo sapiens)Glucose decreases activity of PTGIS protein in aortic endothelial cellsRGD 
PtgisMouseglucose decreases activityISOPTGIS (Homo sapiens)Glucose decreases activity of PTGIS protein in aortic endothelial cellsRGD 

Objects Annotated

Genes (Rattus norvegicus)
Ptgis  (prostaglandin I2 synthase)

Genes (Mus musculus)
Ptgis  (prostaglandin I2 (prostacyclin) synthase)

Genes (Homo sapiens)
PTGIS  (prostaglandin I2 synthase)


Additional Information