Lansoprazole binding to the neutrophils in dextran sulfate sodium-induced rat colitis.

To clarify the effector sites of lansoprazole in the colonic mucosa during the formation of colitis, dextran sulfate sodium-induced colitis was induced by the oral administration of 3% aqueous solution for 3 and 7 days. The effector sites of [3H]lansoprazole were examined by the intra-aortic infusion of the radiolabelled compound and the autoradiographic tracing of water-soluble compounds. As a result, the [3H]lansoprazole binding in the control rat colon was negligible, while in dextran sulfate sodium-treated rats specific binding sites of [3H]lansoprazole were recognized in the cytoplasm of the mesenchymal cells, and most of them coincided with polymorphonuclear leucocytes and macrophages.