TABLE 1

IC50 values for CS-526, omeprazole, lansoprazole, and rabeprazole on H+,K+-ATPase and Na+,K+-ATPase

The ratio of IC50 values of CS-526 and other PPIs on Na+,K+-ATPase against H+,K+-ATPase was calculated by following equation: IC50 value of Na+,K+-ATPase/IC50 value of H+,K+-ATPase.


Compound

IC50 against H+,K+-ATPase

IC50 against Na+,K+-ATPase

Ratio
μM
CS-526 0.061 10.4 170.5
Omeprazole 11 718.6 65.3
Lansoprazole 12 278.2 23.2
Rabeprazole
1.7
53.7
31.6