Inhibition of phospholipase A2 by gabexate mesilate, camostate and aprotinine.

Gabexate mesilate (FOY, ethyl-p-[6-guanidino-hexanoyloxy]-benzoate-methanesulfonate), camostate (N,N-dimethyl-carbamoylmethyl-4-[4-guanidinobenzoyloxy]-phenylacetate), methanesulfonate (FOYPAN) and aprotinine (Trasylol) were tested for possible inhibition of phospholipase A2. Gabexate mesilate at a concentration of 5 x 10(-4) mol/l and camostate at a concentration of 10(-3) mol/l caused a 50% reduction in enzyme activity. There was no inhibition by aprotinine at clinical doses; 40 million KIU/l were necessary to reduce phospholipase A2 activity by 20%.