Effects of betazole hydrochloride and cyclic AMP on the pepsinogen secretion by rabbit gastric mucosa in organ culture.

The effects of betazole hydrochloride, dibutyryl cyclic AMP (DB-cyclic AMP) and betazole hydrochloride plus aminophylline on pepsinogen secretion by rabbit gastric mucosa were studied in organ culture. Betazole hydrochloride alone did not stimulate pepsinogen secretion at the concentrations of 10(-8), 10(-6), 10(-5) and 10(-4) M. However, 10(-3) M DB-cyclic AMP produced a significant stimulation of pepsinogen secretion into the culture medium when compared with the control. In the presence of 3 x 10(-3) M aminophylline, betazole hydrochloride in the concentration of 10(-5) and 10(-4) M stimulated pepsinogen secretion into the culture medium, and the magnitude of this increase was 2.0- and 2.8-fold, respectively, compared with the control. Aminophylline alone could not change pepsinogen secretion into the culture medium. These results suggested that the pepsinogen secretion, stimulated by betazole hydrochloride, was mediated by cyclic AMP in the chief cells.