RGD Reference Report - Induction of prostacyclin/PGI2 synthase expression after cerebral ischemia-reperfusion. - Rat Genome Database

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Induction of prostacyclin/PGI2 synthase expression after cerebral ischemia-reperfusion.

Authors: Fang, YC  Wu, JS  Chen, JJ  Cheung, WM  Tseng, PH  Tam, KB  Shyue, SK  Chen, JJ  Lin, TN 
Citation: Fang YC, etal., J Cereb Blood Flow Metab. 2006 Apr;26(4):491-501.
RGD ID: 8693629
Pubmed: PMID:16094316   (View Abstract at PubMed)
DOI: DOI:10.1038/sj.jcbfm.9600205   (Journal Full-text)

Prostacyclin (PGI2), a potent vasodilator and inhibitor of platelet aggregation and leukocyte activation, is crucial in vascular diseases such as stroke. Prostacyclin synthase (PGIS) is the key enzyme for PGI2 synthesis. Although expression of PGIS was noted in the brain, its role in ischemic insult remains unclear. Here we reported the temporal and spatial expression of PGIS mRNA and protein after 60-min transient ischemia. Northern blot and in situ hybridization revealed a delayed increase of PGIS mRNA in the ischemic cortex at 24- to 72-h after ischemia; PGIS was detected mainly in the ipsilateral penumbra area, pyriform cortex, hippocampus, and leptomeninges. Western blot and immunohistochemical analysis revealed that PGIS proteins were expressed temporally and spatially similar to PGIS mRNA. PGIS was heavily colocalized with PECAM-1 to endothelial cells at the leptomeninges, large and small vessels, and localized to neuronal cells, largely at the penumbra area. A substantial amount of PGIS was also detected in the macrophage and glial cells. To evaluate its role against ischemic infarct, we overexpressed PGIS by adenoviral gene transfer. When infused 72 h before ischemia (- 72 h), Adv-PGIS reduced infarct volume by approximately 50%. However, it had no effect on infarct volume when infused immediately after ischemia (0 h). Eicosanoid analysis revealed selective elevation of PGI2 at - 72 h while PGI2 and TXB2 were both elevated at 0 h, altering the PGI2/thromboxane A2 (TXA2) ratio from 10 to 4. These findings indicate that PGIS protects the brain by enhancing PGI2 synthesis and creating a favorable PGI2/TXA2 ratio.

RGD Manual Disease Annotations    Click to see Annotation Detail View

Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
PTGISHumanbrain ischemia  ISOPtgis (Rattus norvegicus) RGD 
PtgisRatbrain ischemia  IDA  RGD 
PtgisMousebrain ischemia  ISOPtgis (Rattus norvegicus) RGD 

Gene Ontology Annotations    Click to see Annotation Detail View

Biological Process

Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
PtgisRatprostaglandin biosynthetic process  IDA  RGD 
PtgisRatresponse to hypoxia  IMP  RGD 

Molecular Function

Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
PtgisRatprostaglandin-I synthase activity  IDA  RGD 

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