[Effects of IGN-2098, a new histamine H2-receptor antagonist, on gastric secretion and gastric and duodenal lesions induced in rats. Comparison with roxatidine].
A new compound, IGN-2098 [5,6-dimethyl-2-[4-<3-(1-piperidinomethyl) phenoxy>cis-butenylamino]-4-(1H)-pyrimidone.2HCl], was found to be a potential histamine H2-receptor antagonist in the guinea pig atrium. IGN-2098, given p.o., significantly and persistently (for more than 12 hr) inhibited the basal gastric secretion in pylorus-ligated rats. The agent also significantly inhibited the basal gastric secretion when given by the s.c.-, i.d.- or i.p.-route. Stimulated gastric secretion in fistula rats in response to histamine, carbachol or pentagastrin was also significantly inhibited with IGN-2098 given s.c. Pretreatment with IGN-2098 (p.o.) significantly protected the gastric mucosa against pylorus ligation-, water-immersion stress-, histamine-, indomethacin-, HCl.aspirin-, and HCl.ethanol-induced gastric lesions. In addition, the agent significantly protected the duodenal mucosa against mepirizole-induced ulcers. Based upon the ED50 values, the antisecretory effects on histamine, carbachol or pentagastrin-stimulated acid secretion were 6.0, 37.0 or 80 times more potent than roxatidine, respectively. As to the anti-lesion effects on HCl.aspirin-induced gastric lesions or mepirizole-induced duodenal ulcers, IGN-2098 was 8.1 or 14.8 times more potent than roxatidine, respectively. These results suggest that IGN-2098 will be a useful drug for the treatment of gastric and duodenal lesions in man.
Okabe
S
S
Department of Applied Pharmacology, Kyoto Pharmaceutical University, Japan.
Narita
M
M
Nakaji
S
S
Takinami
Y
Y
Kawano
O
O
Misaki
N
N
D000818:Animals; D000897:Anti-Ulcer Agents / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D004305:Dose-Response Relationship, Drug; D004381:Duodenal Ulcer / Q000517:prevention & control*; D005750:Gastric Juice / Q000378:metabolism*; D006635:Histamine H2 Antagonists / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D008297:Male; D010880:Piperidines / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D011744:Pyrimidinones / Q000494:pharmacology* / Q000627:therapeutic use; D051381:Rats; D011919:Rats, Inbred Strains; D013276:Stomach Ulcer / Q000517:prevention & control*
D000897:Anti-Ulcer Agents; D006635:Histamine H2 Antagonists; D010880:Piperidines; D011744:Pyrimidinones; C076167:IGN 2098; C053742:roxatidine acetate