Abstract
The effects of various barbiturates and picrotoxin in modifying the efflux of chloride ( 36Cl −) was studied in a novel subcellular preparation from rat cerebral cortex, the ‘synaptoneurosome’. Dilution of synaptoneurosomes pre-loaded with 36Cl − resulted in rapid efflux of 36Cl − that could be measured as early as 10 s following dilution. In the presence of barbiturates such as pentobarbital and hexobarbital there was a significant increase in 36Cl − efflux which was not observed with the pharmacologically-inactive barbiturate, barbital. The effect of barbiturates in enhancing 36Cl − efflux was also stereospecific [(−)-DMBB > (+)-DMBB] and reversed by picrotoxin. By contrast, picrotoxin alone significantly inhibited 36Cl − efflux. These data demonstrate pharmacologically relevant Cl − transport for the first time in a subcellular brain preparation.
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