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[Properties of Na+/HCO3-(Cl-)-stimulated ATPase in rabbit small intestinal mucosa].

It has been demonstrated that histamine induces in rabbit small intestine an ATPase activity which is stimulated by NaCl or NaHCO3. The Na+/HCO3- (C1-)-stimulated ATPase activity, unlike the Mg2+,HCO3(-)-ATPase activity, has a pH optimum at pH 6.2, is inhibited by ethacrynic acid (10(-4) M) and bivalent metal ions (but not 10(-2) M thiocyanate). The substrate specificity of Na+/HCO3- (C1-)-ATPase and its regulation by Ca2+ ions has been studied. The feasible role of the enzyme in secretion is discussed.