Mechanism of neural regulation of pacemaker activity in gastric smooth muscle

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In segments of smooth muscle tissue isolated from the corpus region, a known pacemaker region of the stomach, of the guinea-pig stomach, mechanism of the modulation of slow potentials during stimulation of cholinergic excitatory and nitrergic inhibitory nerves was investigated using electrophysiological technique. In response to cholinergic and nitrergic stimulations, the amplitude of slow potentials was increased or unaltered while the frequency was not altered or reduced, respectively, with no significant change in the membrane potential. The results indicated an involvement of ICC-IM in the neural regulation of pacemaker activity, but with different mechanism.