To investigate the effect on central nervous transmission of toosendanin (TSN), a presynaptic blocker, rat striatum was perfused in vivo with a TSN-containing artificial cere-brospinal fluid (ACSF) and the level of do...To investigate the effect on central nervous transmission of toosendanin (TSN), a presynaptic blocker, rat striatum was perfused in vivo with a TSN-containing artificial cere-brospinal fluid (ACSF) and the level of dopamine (DA) as well as related metabolites in the collected dialysates has been determined by a microbore HPLC with electrochemical detection (mi-crobore HPLC-ECD). The results are as follows: ( i ) TSN induced a biphasic change of DA from its basal level;( ii ) the basal contents of two metabolites, 3,4-dihydroxyphenylacetic acid (DOPAC) and homovanillic acid (HVA) increased in turn and stayed at a higher level than basal control for a long period. The basal level of 5-hydroxyindoleacetic acid (5-HIAA), a metabolite of 5-hydroxytryptamine(5-HT), had a change similar to that of HVA; (iii) after per-fusion with TSN-containing ACSF, high K+-evoked DA release was inhibited. These results show that TSN does not selectively affect acetylcholine (ACh) release, but probably acts on a common展开更多
文摘To investigate the effect on central nervous transmission of toosendanin (TSN), a presynaptic blocker, rat striatum was perfused in vivo with a TSN-containing artificial cere-brospinal fluid (ACSF) and the level of dopamine (DA) as well as related metabolites in the collected dialysates has been determined by a microbore HPLC with electrochemical detection (mi-crobore HPLC-ECD). The results are as follows: ( i ) TSN induced a biphasic change of DA from its basal level;( ii ) the basal contents of two metabolites, 3,4-dihydroxyphenylacetic acid (DOPAC) and homovanillic acid (HVA) increased in turn and stayed at a higher level than basal control for a long period. The basal level of 5-hydroxyindoleacetic acid (5-HIAA), a metabolite of 5-hydroxytryptamine(5-HT), had a change similar to that of HVA; (iii) after per-fusion with TSN-containing ACSF, high K+-evoked DA release was inhibited. These results show that TSN does not selectively affect acetylcholine (ACh) release, but probably acts on a common
