Secretion of intrinsic factor from dispersed mucosal cells isolated from guinea pig and rabbit stomach

In dispersed mucosal cells prepared from rabbit and guinea pig stomach, the secretion of intrinsic factor was constant (0.3-0.4%/min) for at least 30 min incubation at 37 degrees C. Histamine or isobutyl methylxanthine increased cyclic AMP and intrinsic factor secretion in both cells preparations. Isobutyl methylxanthine potentiated and cimetidine competitively inhibited (ki = 5.10-7 M) both effects of histamine. Dibutyryl cyclic AMP (1.0 mM), also caused a 3-fold increase in intrinsic factor secretion. These results suggest that in rabbit and guinea pig histamine interacts with H2-receptors to increase cyclic AMP which mediates the rise in the rate of intrinsic factor secretion.