Hypericin-induced phototoxicity of human leukemic cell line HL-60 is potentiated by omeprazole, an inhibitor of H+ K+-ATPase and 5′-(N,N-dimethyl)-amiloride, an inhibitor of Na+/H+ exchanger - Mirossay,L.; Mirosˇsˇay,A.; Kočisˇová,E.; Radváková,P.; Misˇkovský,P.; Mojžisˇ,J. (Physiological Research, 1999)