[Effect of selective application of sodium picrate to the hypogastric ganglion in the hypogastric nerve-vas deferens preparation of the guinea pig (author's transl)].

Effect of sodium picrate (picric acid-Na; PA) on the hypogastric ganglion in the hypogastric nerve-vas deferens preparation of the guinea pig was studied and the results are as follows: PA or acetylcholine (ACh) at doses (g/ml) of 10(-5) approximately 10(-4) applied to the ganglion increased the height of the response (R-NS) of the vas deferens to the hypogastric nerve stimulation. Neither drug restored R-NS blocked by hexamethonium 3 X 10(-5). Effects of PA and ACh on R-NS were potentiated by neostigmine 10(-7) and the potentiation was considerably greater for ACh than for PA. Effects of PA on R-NS were not influenced by pretreatment with atropine. Both PA and ACh recovered R-NS which was partially reduced by hemicholinium-3 (HC-3), although the recovery of R-NS by PA was rapidly abolished more than that by ACh when these drugs were repeatedly applied in the presence of HC-3 3 X 10(-5). PA markedly recovered the R-NS reduced by morphine 10(-4) and ACh slightly restored that R-NS. These results suggest that the site of action of PA on the hypogastric ganglion of the guinea pig is different from that of ACh and the effect of PA on R-NS may be due to the acceleration of ACh-release from preganglionic nerve endings.