Alterations in the concentrations of CCK and gastrin in the colon of Lop + SpiA treated group. (A) The CCK concentration was measured in the colon homogenate by an enzyme-linked immunosorbent assay. The minimum detectable concentration of this kit is 0.1–1000 pg/mL CCK. (B) The gastrin concentration was measured in the colon homogenate by an enzyme-linked immunosorbent assay. The minimum detectable concentration of this kit is 0.312–20 pg/mL. Five-to-six mice per group were used in preparation of total lysate and hormone level was assayed in duplicate in each test. Data are reported as the mean ± SD. *, p < 0.05 compared to the untreated group. #, p < 0.05 compared to the Lop + Vehicle treated group. No, Untreated group; Lop, Loperamide; SpiA, Spicatoside A, CCK; Cholecystokinin.