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Serotonergic effects on carbonic anhydrase activity in the choroid plexus

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Abstract

The carbonic anhydrase (CA) activities in the choroid plexus of dogs were investigated by electron microscopy, and the effects of 5-hydroxytryptophan (5-HTP) on them were examined to elucidate the participation of serotonin in the production of cerebrospinal fluid. The reaction products yielded by the method employed proved to be CA activity by elimination tests using acetazolamide (Diamox). Following administration of 5-HTP, the CA activities fell to 43.3% of the control value, that is, approximately 56% of the CA activities in the choroid plexus were affected by serotonin. When tetrabenazine (TBZ) was administered, the CA activities in the choroid plexus decreased to 22.4% of the control value. These results suggest that the CA activity in the choroid plexus is remarkably suppressed when nervous control of the choroid plexus is disturbed by the administration of a monoamine denervator such as TBZ. The present data indicate that the serotonergic inhibitory effect on the CA activity in the choroid plexus may be less predominant than that of TBZ and acetazolamide.

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Nakamura, S., Sasaki, J. & Tsubokawa, T. Serotonergic effects on carbonic anhydrase activity in the choroid plexus. Child's Nerv Syst 7, 442–447 (1991). https://doi.org/10.1007/BF00263186

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  • DOI: https://doi.org/10.1007/BF00263186

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