RGD Reference Report - Roles of cyclooxygenase 2 and microsomal prostaglandin E synthase 1 in rat acid reflux oesophagitis. - Rat Genome Database

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Roles of cyclooxygenase 2 and microsomal prostaglandin E synthase 1 in rat acid reflux oesophagitis.

Authors: Hayakawa, T  Fujiwara, Y  Hamaguchi, M  Sugawa, T  Okuyama, M  Sasaki, E  Watanabe, T  Tominaga, K  Oshitani, N  Higuchi, K  Arakawa, T 
Citation: Hayakawa T, etal., Gut. 2006 Apr;55(4):450-6. Epub 2005 Oct 6.
RGD ID: 2300085
Pubmed: PMID:16210398   (View Abstract at PubMed)
PMCID: PMC1856161   (View Article at PubMed Central)
DOI: DOI:10.1136/gut.2005.081943   (Journal Full-text)

BACKGROUND: Although prostaglandin E2 (PGE2), cyclooxygenase 2 (COX-2), and microsomal prostaglandin E synthase 1 (mPGES-1) are known to play a role in various inflammatory events, their roles in the pathogenesis of gastro-oesophageal reflux disease are not known. AIMS: We examined the dynamics of COX-1, COX-2, mPGES-1, mPGES-2, cytosolic PGES (cPGES), and PGE2 synthetic activity in rat acid reflux oesophagitis and the effects of COX-2 inhibitors on the severity of oesophagitis. METHODS: Acid reflux oesophagitis was induced by ligating the transitional region between the forestomach and the glandular portion and wrapping the duodenum near the pylorus. Rats were killed on day 3 (acute phase) or day 21 (chronic phase) after induction of oesophagitis. RESULTS: Expression of COX-2 and mPGES-1 was markedly increased in oesophagitis while modest changes in COX-1, cPGES, and mPGES-2 expression were observed. COX-2 and mPGES-1 were colocalised in epithelial cells of the basal layer, as well as inflammatory and mesenchymal cells in the lamina propria and submucosa. COX-2 inhibitors significantly reduced the severity of chronic oesophagitis but did not affect acute oesophageal lesions. COX-2 inhibitors significantly inhibited the increase in PGE2 synthesis in oesophageal lesions on both days 3 and 21. Epithelial proliferation was significantly increased in the basal layer on day 21. Inflammatory cells and epithelial cells of the basal layer exhibited reactions for EP4 in oesophagitis. CONCLUSION: PGE2 derived from COX-2 and mPGES-1 plays a significant role in the pathogenesis of chronic acid reflux oesophagitis, and possibly in basal hyperplasia and persistent inflammatory cell infiltration.



RGD Manual Disease Annotations    Click to see Annotation Detail View

  
Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
PTGESHumanpeptic esophagitis  ISOPtges (Rattus norvegicus)protein:increased expression:esophagusRGD 
PtgesRatpeptic esophagitis  IEP protein:increased expression:esophagusRGD 
PtgesMousepeptic esophagitis  ISOPtges (Rattus norvegicus)protein:increased expression:esophagusRGD 

Objects Annotated

Genes (Rattus norvegicus)
Ptges  (prostaglandin E synthase)

Genes (Mus musculus)
Ptges  (prostaglandin E synthase)

Genes (Homo sapiens)
PTGES  (prostaglandin E synthase)


Additional Information