PMID: 9547354May 9, 1998Paper

Altered brain serotonin homeostasis and locomotor insensitivity to 3, 4-methylenedioxymethamphetamine ("Ecstasy") in serotonin transporter-deficient mice

Molecular Pharmacology
D BengelK P Lesch

Abstract

The sodium-dependent, high affinity serotonin [5-hydroxytryptamine (5-HT)] transporter (5-HTT) provides the primary mechanism for inactivation of 5-HT after its release into the synaptic cleft. To further evaluate the function of the 5-HTT, the murine gene was disrupted by homologous recombination. Despite evidence that excess extracellular 5-HT during embryonic development, including that produced by drugs that inhibit the 5-HTT, may lead to severe craniofacial and cardiac malformations, no obvious developmental phenotype was observed in the 5-HTT-/- mice. High affinity [3H]5-HT uptake was completely absent in 5-HTT-/- mice, confirming a physiologically effective knockout of the 5-HTT gene. 5-HTT binding sites labeled with [125I] 3 beta-(4'-iodophenyl)tropan-2 beta-carboxylic acid methyl ester were reduced in a gene dose-dependent manner, with no demonstrable binding in 5-HTT-/- mutants. In adult 5-HTT-/- mice, marked reductions (60-80%) in 5-HT concentrations were measured in several brain regions. While (+)-amphetamine-induced hyperactivity did not differ across genotypes, the locomotor enhancing effects of (+)-3, 4-methylenedioxymethamphetamine, a substituted amphetamine that releases 5-HT via a transporter-dependent mechan...Continue Reading

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Citations

Jun 7, 2000·The Journal of Clinical Investigation·S EddahibiS Adnot
Apr 26, 2001·Proceedings of the National Academy of Sciences of the United States of America·I SoraG R Uhl
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