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Neurotoxins That Affect Central Serotoninergic Systems

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Botulinum and Tetanus Neurotoxins

Abstract

The last 30 years have witnessed an explosive increase in our knowledge of neuronal communication in the central nervous system (CNS), mainly due to the methodological progress which has made it possible to identify neurons and neuronal networks by the chemical substance they use as their transmitter. Historically, the first chemically-identified neurotransmitter systems were found to utilize aromatic monoamines; either the catecholamines noradrenaline (NA), adrenaline (AD) and dopamine (DA) or the indoleamine serotonin (5-hydroxytryptamine, 5-HT). The first comprehensive descriptions of central 5-HT were based on biochemical determinations of this aromatic monoamine in different brain regions 1–4 and very soon followed by the use of histofluorescent microscopy 5–9, measurements of tryptophan hydroxylase 10, immunocytochemical surveys using antibodies against 5-HT itself 11 as well as autoradiographic tracing procedures based on uptake properties of the 5-HT system. 12–15 A strategy in the study of a particular nerve function that has been widely accepted has been to remove surgically either a nerve or the ganglion from which the nerve originates, and then establish the characteristics, magnitude and extent of the functional loss. In the particular case of aromatic monoamine neurotransmitters, this approach can be exemplified by the work pioneered by Cannon 16 in the sympathetic nervous system, and by the use of immunosympathectomies using antibodies againts nerve growth factor 17. The research on central catecholamine and 5-HT systems has benefited from the use of different drugs and agents used as chemical scalpels to dissect out the different projections and at the same time this strategy provided interesting models for the study of changes in sensitivity, uptake mechanisms, behavioural modifications, axonal sprouting and plasticity. The first compound used as a selective neurotoxin for the catecholamines was 2,4,5-trihydroxyphenylethylamine or 6-hydroxydopamine (6-OHDA) that produces a permanent reduction of NA and DA in the CNS 18. Other compounds that more or less selectively destroy catecholamines include DSP-4 19 and MPTP 20. The most frequently used compound to produce catecholamine denervations has been 6-OHDA , and it has been proposed that it undergoes spontaneous autooxidation within neurons to intermediate p-quinones, which then affect membrane integrity or interfere with energy production by interrupting the mitochondrial respiratory chain 21. Compounds that affect 5-HT neurons were developed later, and similar mechanisms of action have been proposed for the most frequently used, i.e.: 5,6-dihydroxytryptamine 22–24 and 5,7-dihydroxytryptamine 25–27. In addition, other neurotoxins for central 5-HT neurons include synthesis inhibitors and amphetamine derivatives and will also be discussed in this review.

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Reader, T.A., Dewar, K.M. (1993). Neurotoxins That Affect Central Serotoninergic Systems. In: DasGupta, B.R. (eds) Botulinum and Tetanus Neurotoxins. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9542-4_60

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  • DOI: https://doi.org/10.1007/978-1-4757-9542-4_60

  • Publisher Name: Springer, Boston, MA

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