Inhibition of gastric H+,K+-ATPase by new dihydropyrazole derivative KYY-008

Biochem Biophys Res Commun. 2021 Aug 27:567:177-182. doi: 10.1016/j.bbrc.2021.06.056. Epub 2021 Jun 21.

Abstract

The gastric proton pump (H+,K+-ATPase) responsible for the H+ secretion of gastric acid is an essential therapeutic target for acid-related diseases. H+,K+-ATPase belongs to a P2-type ATPase family. Here, we examined the effects of a newly synthesized dihydropyrazole derivative KYY-008 on the H+,K+-ATPase. KYY-008 concentration-dependently inhibited the enzyme activity of the ATPase in the membrane fractions prepared from isolated hog gastric mucosa and from human kidney HEK293 cells in which gastric H+,K+-ATPase is exogenously expressed. The IC50 values in these samples were 3.4 μM and 3.7 μM, respectively. In addition, KYY-008 significantly inhibited the H+,K+-ATPase-derived H+ uptake into the tightly sealed vesicles prepared from the hog gastric mucosa. In contrast, KYY-008 has no effect on the activities of other P2-type ATPases such as Na+,K+-ATPase and Ca2+-ATPase. KYY-008 did not change the ionic currents of voltage-dependent Ca2+ channels, that were potential targets for some dihydropyrazole derivatives. Together, we discovered a new dihydropyrazole derivative which acts as a selective inhibitor of gastric H+,K+-ATPase.

Keywords: Dihydropyrazole; Gastric proton pump; H(+),K(+)-ATPase; Stomach.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • H(+)-K(+)-Exchanging ATPase / metabolism*
  • HEK293 Cells
  • Humans
  • Proton Pump Inhibitors / chemistry*
  • Proton Pump Inhibitors / pharmacology*
  • Pyrazoles / chemistry*
  • Pyrazoles / pharmacology*
  • Swine

Substances

  • Proton Pump Inhibitors
  • Pyrazoles
  • H(+)-K(+)-Exchanging ATPase