The nature of d,l-fenfluramine-induced 5-HT reuptake transporter loss in rats.

Abstract:

:The administration of the anorexigenic drug d,l-fenfluramine (Ponderax) to laboratory animals results in a dose-dependent reduction in presynaptically located serotonergic reuptake transporter protein. This long-term effect may represent an altered mechanism of synthesis of the transporter (downregulation). Alternatively, fenfluramine may destroy the serotonergic terminals on which 5-HT transporters are located. To distinguish between these two alternatives, we applied an assay of neurotransmitter-specific nerve endings (alpha) to brain tissue from two animal models of reduced 5-HT transporter density. In Model 1, serotonergic nerve terminals were destroyed (rats received 5,7-dihydroxytryptamine [5,7-DHT] intracisternally); in Model 2, there was a loss of 5-HT transporter per se on otherwise intact serotonergic nerve terminals. The manner in which alpha declined as transporter density was decreased (reducing Vmax values) in animal Models 1 and 2 was found to be significantly different. In rats treated with fenfluramine, the association between 5-HT transporter density and alpha was the same as in the neurotoxic model.

journal_name

Mol Neurobiol

journal_title

Molecular neurobiology

authors

Westphalen RI,Dodd PR

doi

10.1007/BF02740693

subject

Has Abstract

pub_date

1995-08-01 00:00:00

pages

165-75

issue

1-3

eissn

0893-7648

issn

1559-1182

journal_volume

11

pub_type

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