Effects of 16,16-dimethyl prostaglandin E2 on ethanol-induced and aspirin-induced gastric damage in the rat. Scanning electron microscopic study.
Ethanol and aspirin were administered orally to fasted rats and the effects of 16,16-dimethyl prostaglandin E2 (given orally as a pretreatment) were studied using scanning electron microscopy. Gastric secretory studies (pylorus ligation for 2 h) showed that 3 and 30 micrograms/kg of 16,16-dimethyl prostaglandin E2 were nonantisecretory doses and that 100 micrograms/kg was an antisecretory dose. 16,16-Dimethyl prostaglandin E2, given orally at 3-100 micrograms/Kg, induced no appreciable changes in the gastric surface epithelial cells. Oral administration of 1 ml of 50% ethanol invariably induced, within 10 min, extensive exfoliation of surface epithelial cells throughout the corpus and antrum and exposed the lamina propria. 16,16-Dimethyl prostaglandin E2, given orally at 3, 30, and 100 micrograms/kg 30 min before ethanol treatment, had no protective effect. Aspirin, given orally at 30 or 100 mg/kg, also damaged the surface epithelium of both the corpus and the antrum within 10 min. This damage ranged from apical cellular erosions to widespread exposure of the lamina propria. 16,16-Dimethyl prostaglandin E2, given orally at 3 or 30 micrograms/kg 30 min before aspirin treatment, significantly inhibited the gastric damage induced by both 30 and 100 mg/kg of aspirin. The inhibition of damage index was about 50%-60% at either 30 or 100 micrograms/kg of 16,16-dimethyl prostaglandin E2. The mechanism of the protection seen with 16,16-dimethyl prostaglandin E2 remains to be determined.
D015064:16,16-Dimethylprostaglandin E2 / Q000494:pharmacology*; D000818:Animals; D001241:Aspirin / Q000037:antagonists & inhibitors*; D004848:Epithelium / Q000187:drug effects / Q000648:ultrastructure; D000431:Ethanol / Q000037:antagonists & inhibitors*; D005753:Gastric Mucosa / Q000187:drug effects* / Q000378:metabolism / Q000648:ultrastructure; D008297:Male; D008855:Microscopy, Electron, Scanning; D011459:Prostaglandins E, Synthetic / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains
D011459:Prostaglandins E, Synthetic; D000431:Ethanol; D015064:16,16-Dimethylprostaglandin E2; D001241:Aspirin