Inhibition of gastric H+, K(+)-ATPase and acid secretion by ellagic acid.
The effects of ellagic acid on gastric H+, K(+)-ATPase, acid secretion, and the occurrence of gastric ulcers were studied. Ellagic acid inhibited hog gastric H+, K(+)-ATPase activity with a 50% inhibition at 2.1 x 10(-6)M; kinetic studies showed that the inhibition of H+, K(+)-ATPase by ellagic acid is competitive with respect to ATP and is noncompetitive with respect to K+. The effect on gastric ulcers was investigated by using a stress ulcer model. Intraperitoneal administration of ellagic acid at above 5 mg/kg markedly reduced the occurrence of gastric lesion. Ellagic acid significantly reduced acid secretion at the same doses. These results suggest that ellagic acid has a marked inhibitory effect on acid secretion and the occurrence of stress-induced gastric lesions, and these effects may be attributed to the inhibition of H+, K(+)-ATPase activity.
Murakami
S
S
Research Center, Taisho Pharmaceutical Co. Ltd., Saitama, Japan.
Isobe
Y
Y
Kijima
H
H
Nagai
H
H
Muramatu
M
M
Otomo
S
S
D000251:Adenosine Triphosphatases / Q000037:antagonists & inhibitors*; D000818:Animals; D004610:Ellagic Acid / Q000494:pharmacology*; D005744:Gastric Acid / Q000378:metabolism*; D005753:Gastric Mucosa / Q000187:drug effects* / Q000201:enzymology; D017506:H(+)-K(+)-Exchanging ATPase; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D013552:Swine
D004610:Ellagic Acid; D000251:Adenosine Triphosphatases; D017506:H(+)-K(+)-Exchanging ATPase