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Chronic SSRI Treatment Exacerbates Serotonin Deficiency in Humanized Tph2 Mutant Mice

Identifieur interne : 001362 ( Ncbi/Merge ); précédent : 001361; suivant : 001363

Chronic SSRI Treatment Exacerbates Serotonin Deficiency in Humanized Tph2 Mutant Mice

Auteurs : William X0a B. Siesser [États-Unis] ; Benjamin D. Sachs [États-Unis] ; Amy J. Ramsey [Canada] ; Tatyana D. Sotnikova [Italie] ; Jean-Martin Beaulieu [Canada] ; Xiaodong Zhang [Singapour, États-Unis] ; Marc G. Caron [États-Unis] ; Raul R. Gainetdinov [États-Unis, Italie]

Source :

RBID : PMC:3547473

Abstract

Selective serotonin reuptake inhibitors (SSRIs) are a major class of antidepressants that act by blocking inward transport of serotonin (5-HT) into presynaptic neurons mediated by the serotonin transporter (SERT). Both reuptake and ongoing synthesis are essential in supporting intraneuronal serotonin concentrations in serotonergic neurons. A rare mutation in tryptophan hydroxylase 2 (Tph2), the rate limiting enzyme for 5-HT synthesis, was identified in several patients with major depression, and knock-in mice expressing the analogous mutation (R439H Tph2 KI) show 80% reduction in 5-HT synthesis and tissue levels. Chronic treatment with SSRIs (fluoxetine and paroxetine) resulted in a dramatic further depletion of 5-HT tissue levels in R439H Tph2 KI mice (down to 1–3% of wild type levels) while having little effects in wild-type controls. Treatment with the 5-HT precursor 5-hydroxytryptophan (5-HTP) restored 5-HT tissue content in mutant mice, and cotreatment with 5-HTP and fluoxetine essentially prevented the depleting effect of a chronic SSRI. These data demonstrate that chronic SSRI treatment could further exacerbate the 5-HT deficiency in Tph2 mutation carriers, and this can be prevented by 5-HTP supplementation.


Url:
DOI: 10.1021/cn300127h
PubMed: 23336047
PubMed Central: 3547473

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PMC:3547473

Le document en format XML

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<p>Selective serotonin reuptake inhibitors (SSRIs) are a major class of antidepressants that act by blocking inward transport of serotonin (5-HT) into presynaptic neurons mediated by the serotonin transporter (SERT). Both reuptake and ongoing synthesis are essential in supporting intraneuronal serotonin concentrations in serotonergic neurons. A rare mutation in tryptophan hydroxylase 2 (
<italic>Tph2</italic>
), the rate limiting enzyme for 5-HT synthesis, was identified in several patients with major depression, and knock-in mice expressing the analogous mutation (R439H
<italic>Tph2</italic>
KI) show 80% reduction in 5-HT synthesis and tissue levels. Chronic treatment with SSRIs (fluoxetine and paroxetine) resulted in a dramatic further depletion of 5-HT tissue levels in R439H
<italic>Tph2</italic>
KI mice (down to 1–3% of wild type levels) while having little effects in wild-type controls. Treatment with the 5-HT precursor 5-hydroxytryptophan (5-HTP) restored 5-HT tissue content in mutant mice, and cotreatment with 5-HTP and fluoxetine essentially prevented the depleting effect of a chronic SSRI. These data demonstrate that chronic SSRI treatment could further exacerbate the 5-HT deficiency in
<italic>Tph2</italic>
mutation carriers, and this can be prevented by 5-HTP supplementation.</p>
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<article-title>Chronic SSRI Treatment Exacerbates Serotonin Deficiency in Humanized
<italic>Tph2</italic>
Mutant Mice</article-title>
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<contrib-group>
<contrib contrib-type="author" id="ath1">
<name>
<surname>Siesser</surname>
<given-names>William B.</given-names>
</name>
<xref rid="aff1" ref-type="aff"></xref>
</contrib>
<contrib contrib-type="author" id="ath2">
<name>
<surname>Sachs</surname>
<given-names>Benjamin D.</given-names>
</name>
<xref rid="aff1" ref-type="aff"></xref>
</contrib>
<contrib contrib-type="author" id="ath3">
<name>
<surname>Ramsey</surname>
<given-names>Amy J.</given-names>
</name>
<xref rid="aff2" ref-type="aff"></xref>
</contrib>
<contrib contrib-type="author" id="ath4">
<name>
<surname>Sotnikova</surname>
<given-names>Tatyana D.</given-names>
</name>
<xref rid="aff3" ref-type="aff">§</xref>
</contrib>
<contrib contrib-type="author" id="ath5">
<name>
<surname>Beaulieu</surname>
<given-names>Jean-Martin</given-names>
</name>
<xref rid="aff4" ref-type="aff"></xref>
</contrib>
<contrib contrib-type="author" id="ath6">
<name>
<surname>Zhang</surname>
<given-names>Xiaodong</given-names>
</name>
<xref rid="aff5" ref-type="aff"></xref>
<xref rid="aff6" ref-type="aff">#</xref>
<xref rid="aff7" ref-type="aff"></xref>
</contrib>
<contrib contrib-type="author" id="ath7">
<name>
<surname>Caron</surname>
<given-names>Marc G.</given-names>
</name>
<xref rid="aff1" ref-type="aff"></xref>
<xref rid="aff8" ref-type="aff"></xref>
</contrib>
<contrib contrib-type="author" corresp="yes" id="ath8">
<name>
<surname>Gainetdinov</surname>
<given-names>Raul R.</given-names>
</name>
<xref rid="cor1" ref-type="other">*</xref>
<xref rid="aff1" ref-type="aff"></xref>
<xref rid="aff3" ref-type="aff">§</xref>
</contrib>
<aff id="aff1">
<label></label>
Department of Cell Biology,
<institution>Duke University</institution>
, Durham, North Carolina 27710, United States</aff>
<aff id="aff2">
<label></label>
Department of Pharmacology and Toxicology,
<institution>University of Toronto</institution>
, ON, Canada M5S 1A8</aff>
<aff id="aff3">
<label>§</label>
Department of Neuroscience and Brain Technologies,
<institution>Istituto Italiano di Tecnologia</institution>
(IIT), Via Morego 30, Genova, 16163 Italy</aff>
<aff id="aff4">
<label></label>
Department of Psychiatry and Neuroscience,
<institution>Université Laval/IUSMQ</institution>
, Québec, Canada</aff>
<aff id="aff5">
<label></label>
Neuroscience & Behavioral Disorders Program,
<institution>Duke−NUS Graduate Medical School Singapore</institution>
, Singapore</aff>
<aff id="aff6">
<label>#</label>
Department of Physiology,
<institution>National University of Singapore</institution>
, Singapore</aff>
<aff id="aff7">
<label></label>
Department of Psychiatry and Behavioral Sciences,
<institution>Duke University Medical Center</institution>
, Durham, North Carolina 27710, United States</aff>
<aff id="aff8">
<label></label>
Department of Neurobiology,
<institution>Duke University Medical Center</institution>
, Durham, North Carolina 27710, United States</aff>
</contrib-group>
<author-notes>
<corresp id="cor1">
<label>*</label>
Mailing address: Department of Neuroscience and Brain Technologies, Istituto Italiano di Tecnologia, Via Morego 30, Genoa, 16167, Italy. Telephone:
<phone>+39 010 71781513</phone>
. E-mail:
<email>raul.gainetdinov@iit.it</email>
.</corresp>
</author-notes>
<pub-date pub-type="epub">
<day>01</day>
<month>10</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="collection">
<day>16</day>
<month>01</month>
<year>2013</year>
</pub-date>
<volume>4</volume>
<issue>1</issue>
<issue-title>Celebrating 25 Years of the Serotonin Club</issue-title>
<fpage>84</fpage>
<lpage>88</lpage>
<history>
<date date-type="received">
<day>13</day>
<month>08</month>
<year>2012</year>
</date>
<date date-type="accepted">
<day>01</day>
<month>10</month>
<year>2012</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright © 2012 American Chemical Society</copyright-statement>
<copyright-year>2012</copyright-year>
<copyright-holder>American Chemical Society</copyright-holder>
</permissions>
<abstract>
<p content-type="toc-graphic">
<graphic xlink:href="cn-2012-00127h_0005" id="ab-tgr1"></graphic>
</p>
<p>Selective serotonin reuptake inhibitors (SSRIs) are a major class of antidepressants that act by blocking inward transport of serotonin (5-HT) into presynaptic neurons mediated by the serotonin transporter (SERT). Both reuptake and ongoing synthesis are essential in supporting intraneuronal serotonin concentrations in serotonergic neurons. A rare mutation in tryptophan hydroxylase 2 (
<italic>Tph2</italic>
), the rate limiting enzyme for 5-HT synthesis, was identified in several patients with major depression, and knock-in mice expressing the analogous mutation (R439H
<italic>Tph2</italic>
KI) show 80% reduction in 5-HT synthesis and tissue levels. Chronic treatment with SSRIs (fluoxetine and paroxetine) resulted in a dramatic further depletion of 5-HT tissue levels in R439H
<italic>Tph2</italic>
KI mice (down to 1–3% of wild type levels) while having little effects in wild-type controls. Treatment with the 5-HT precursor 5-hydroxytryptophan (5-HTP) restored 5-HT tissue content in mutant mice, and cotreatment with 5-HTP and fluoxetine essentially prevented the depleting effect of a chronic SSRI. These data demonstrate that chronic SSRI treatment could further exacerbate the 5-HT deficiency in
<italic>Tph2</italic>
mutation carriers, and this can be prevented by 5-HTP supplementation.</p>
</abstract>
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<li>Canada</li>
<li>Italie</li>
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<name sortKey="Caron, Marc G" sort="Caron, Marc G" uniqKey="Caron M" first="Marc G." last="Caron">Marc G. Caron</name>
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<name sortKey="Gainetdinov, Raul R" sort="Gainetdinov, Raul R" uniqKey="Gainetdinov R" first="Raul R." last="Gainetdinov">Raul R. Gainetdinov</name>
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<name sortKey="Zhang, Xiaodong" sort="Zhang, Xiaodong" uniqKey="Zhang X" first="Xiaodong" last="Zhang">Xiaodong Zhang</name>
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