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Inhibition of mitochondrial protein import by mutant huntingtin

Identifieur interne : 000F41 ( Pmc/Checkpoint ); précédent : 000F40; suivant : 000F42

Inhibition of mitochondrial protein import by mutant huntingtin

Auteurs : Hiroko Yano [États-Unis] ; Sergei V. Baranov [États-Unis] ; Oxana V. Baranova [États-Unis] ; Jinho Kim [États-Unis] ; Yanchun Pan [États-Unis] ; Svitlana Yablonska [États-Unis] ; Diane L. Carlisle [États-Unis] ; Robert J. Ferrante [États-Unis] ; Albert H. Kim [États-Unis] ; Robert M. Friedlander [États-Unis]

Source :

RBID : PMC:4174557

Abstract

Mitochondrial dysfunction is associated with neuronal loss in Huntington’s disease (HD), a neurodegenerative disease caused by an abnormal polyglutamine expansion in huntingtin (Htt). However, the mechanisms linking mutant Htt and mitochondrial dysfunction in HD remain unknown. We identify an interaction between mutant Htt and the TIM23 mitochondrial protein import complex. Remarkably, recombinant mutant Htt directly inhibited mitochondrial protein import in vitro. Furthermore, mitochondria from brain synaptosomes of presymptomatic HD model mice and from mutant Htt-expressing primary neurons exhibited a protein import defect, suggesting that deficient protein import is an early event in HD. The mutant Htt-induced mitochondrial import defect and subsequent neuronal death were attenuated by overexpression of TIM23 complex subunits, demonstrating that deficient mitochondrial protein import causes mutant Htt-induced neuronal death. Collectively, these findings provide evidence for a direct link between mutant Htt, mitochondrial dysfunction and neuronal pathology, with implications for mitochondrial protein import-based therapies in HD.


Url:
DOI: 10.1038/nn.3721
PubMed: 24836077
PubMed Central: 4174557


Affiliations:


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PMC:4174557

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<p id="P1">Mitochondrial dysfunction is associated with neuronal loss in Huntington’s disease (HD), a neurodegenerative disease caused by an abnormal polyglutamine expansion in huntingtin (Htt). However, the mechanisms linking mutant Htt and mitochondrial dysfunction in HD remain unknown. We identify an interaction between mutant Htt and the TIM23 mitochondrial protein import complex. Remarkably, recombinant mutant Htt directly inhibited mitochondrial protein import
<italic>in vitro</italic>
. Furthermore, mitochondria from brain synaptosomes of presymptomatic HD model mice and from mutant Htt-expressing primary neurons exhibited a protein import defect, suggesting that deficient protein import is an early event in HD. The mutant Htt-induced mitochondrial import defect and subsequent neuronal death were attenuated by overexpression of TIM23 complex subunits, demonstrating that deficient mitochondrial protein import causes mutant Htt-induced neuronal death. Collectively, these findings provide evidence for a direct link between mutant Htt, mitochondrial dysfunction and neuronal pathology, with implications for mitochondrial protein import-based therapies in HD.</p>
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<front>
<journal-meta>
<journal-id journal-id-type="nlm-journal-id">9809671</journal-id>
<journal-id journal-id-type="pubmed-jr-id">21092</journal-id>
<journal-id journal-id-type="nlm-ta">Nat Neurosci</journal-id>
<journal-id journal-id-type="iso-abbrev">Nat. Neurosci.</journal-id>
<journal-title-group>
<journal-title>Nature neuroscience</journal-title>
</journal-title-group>
<issn pub-type="ppub">1097-6256</issn>
<issn pub-type="epub">1546-1726</issn>
</journal-meta>
<article-meta>
<article-id pub-id-type="pmid">24836077</article-id>
<article-id pub-id-type="pmc">4174557</article-id>
<article-id pub-id-type="doi">10.1038/nn.3721</article-id>
<article-id pub-id-type="manuscript">NIHMS614355</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Article</subject>
</subj-group>
</article-categories>
<title-group>
<article-title>Inhibition of mitochondrial protein import by mutant huntingtin</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname>Yano</surname>
<given-names>Hiroko</given-names>
</name>
<xref ref-type="aff" rid="A1">1</xref>
<xref ref-type="aff" rid="A2">2</xref>
<xref ref-type="aff" rid="A3">3</xref>
<xref ref-type="aff" rid="A4">4</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Baranov</surname>
<given-names>Sergei V</given-names>
</name>
<xref ref-type="aff" rid="A1">1</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Baranova</surname>
<given-names>Oxana V</given-names>
</name>
<xref ref-type="aff" rid="A1">1</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Kim</surname>
<given-names>Jinho</given-names>
</name>
<xref ref-type="aff" rid="A1">1</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Pan</surname>
<given-names>Yanchun</given-names>
</name>
<xref ref-type="aff" rid="A2">2</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Yablonska</surname>
<given-names>Svitlana</given-names>
</name>
<xref ref-type="aff" rid="A1">1</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Carlisle</surname>
<given-names>Diane L</given-names>
</name>
<xref ref-type="aff" rid="A1">1</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Ferrante</surname>
<given-names>Robert J</given-names>
</name>
<xref ref-type="aff" rid="A1">1</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Kim</surname>
<given-names>Albert H</given-names>
</name>
<xref ref-type="aff" rid="A2">2</xref>
<xref ref-type="aff" rid="A3">3</xref>
<xref ref-type="aff" rid="A5">5</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Friedlander</surname>
<given-names>Robert M</given-names>
</name>
<xref ref-type="aff" rid="A1">1</xref>
<xref ref-type="aff" rid="A6">6</xref>
</contrib>
</contrib-group>
<aff id="A1">
<label>1</label>
Department of Neurological Surgery, Neuroapoptosis Laboratory, University of Pittsburgh, Pittsburgh, Pennsylvania, USA</aff>
<aff id="A2">
<label>2</label>
Department of Neurological Surgery, Washington University School of Medicine, St. Louis, Missouri, USA</aff>
<aff id="A3">
<label>3</label>
Department of Neurology, Washington University School of Medicine, St. Louis, Missouri, USA</aff>
<aff id="A4">
<label>4</label>
Department of Genetics, Washington University School of Medicine, St. Louis, Missouri, USA</aff>
<aff id="A5">
<label>5</label>
Department of Developmental Biology, Washington University School of Medicine, St. Louis, Missouri, USA</aff>
<aff id="A6">
<label>6</label>
University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA</aff>
<author-notes>
<corresp id="cor1">Correspondence should be addressed to R.M.F. (
<email>friedlanderr@upmc.edu</email>
)</corresp>
</author-notes>
<pub-date pub-type="nihms-submitted">
<day>19</day>
<month>7</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub">
<day>18</day>
<month>5</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="ppub">
<month>6</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="pmc-release">
<day>25</day>
<month>9</month>
<year>2014</year>
</pub-date>
<volume>17</volume>
<issue>6</issue>
<fpage>822</fpage>
<lpage>831</lpage>
<pmc-comment>elocation-id from pubmed: 10.1038/nn.3721</pmc-comment>
<permissions>
<copyright-statement>© 2014 Nature America, Inc. All rights reserved.</copyright-statement>
<copyright-year>2014</copyright-year>
</permissions>
<abstract>
<p id="P1">Mitochondrial dysfunction is associated with neuronal loss in Huntington’s disease (HD), a neurodegenerative disease caused by an abnormal polyglutamine expansion in huntingtin (Htt). However, the mechanisms linking mutant Htt and mitochondrial dysfunction in HD remain unknown. We identify an interaction between mutant Htt and the TIM23 mitochondrial protein import complex. Remarkably, recombinant mutant Htt directly inhibited mitochondrial protein import
<italic>in vitro</italic>
. Furthermore, mitochondria from brain synaptosomes of presymptomatic HD model mice and from mutant Htt-expressing primary neurons exhibited a protein import defect, suggesting that deficient protein import is an early event in HD. The mutant Htt-induced mitochondrial import defect and subsequent neuronal death were attenuated by overexpression of TIM23 complex subunits, demonstrating that deficient mitochondrial protein import causes mutant Htt-induced neuronal death. Collectively, these findings provide evidence for a direct link between mutant Htt, mitochondrial dysfunction and neuronal pathology, with implications for mitochondrial protein import-based therapies in HD.</p>
</abstract>
</article-meta>
</front>
</pmc>
<affiliations>
<list>
<country>
<li>États-Unis</li>
</country>
<region>
<li>Missouri (État)</li>
<li>Pennsylvanie</li>
</region>
<settlement>
<li>Pittsburgh</li>
<li>Saint-Louis (Missouri)</li>
</settlement>
<orgName>
<li>Université de Pittsburgh</li>
<li>École de médecine (Université Washington de Saint-Louis)</li>
</orgName>
</list>
<tree>
<country name="États-Unis">
<region name="Pennsylvanie">
<name sortKey="Yano, Hiroko" sort="Yano, Hiroko" uniqKey="Yano H" first="Hiroko" last="Yano">Hiroko Yano</name>
</region>
<name sortKey="Baranov, Sergei V" sort="Baranov, Sergei V" uniqKey="Baranov S" first="Sergei V" last="Baranov">Sergei V. Baranov</name>
<name sortKey="Baranova, Oxana V" sort="Baranova, Oxana V" uniqKey="Baranova O" first="Oxana V" last="Baranova">Oxana V. Baranova</name>
<name sortKey="Carlisle, Diane L" sort="Carlisle, Diane L" uniqKey="Carlisle D" first="Diane L" last="Carlisle">Diane L. Carlisle</name>
<name sortKey="Ferrante, Robert J" sort="Ferrante, Robert J" uniqKey="Ferrante R" first="Robert J" last="Ferrante">Robert J. Ferrante</name>
<name sortKey="Friedlander, Robert M" sort="Friedlander, Robert M" uniqKey="Friedlander R" first="Robert M" last="Friedlander">Robert M. Friedlander</name>
<name sortKey="Friedlander, Robert M" sort="Friedlander, Robert M" uniqKey="Friedlander R" first="Robert M" last="Friedlander">Robert M. Friedlander</name>
<name sortKey="Kim, Albert H" sort="Kim, Albert H" uniqKey="Kim A" first="Albert H" last="Kim">Albert H. Kim</name>
<name sortKey="Kim, Albert H" sort="Kim, Albert H" uniqKey="Kim A" first="Albert H" last="Kim">Albert H. Kim</name>
<name sortKey="Kim, Albert H" sort="Kim, Albert H" uniqKey="Kim A" first="Albert H" last="Kim">Albert H. Kim</name>
<name sortKey="Kim, Jinho" sort="Kim, Jinho" uniqKey="Kim J" first="Jinho" last="Kim">Jinho Kim</name>
<name sortKey="Pan, Yanchun" sort="Pan, Yanchun" uniqKey="Pan Y" first="Yanchun" last="Pan">Yanchun Pan</name>
<name sortKey="Yablonska, Svitlana" sort="Yablonska, Svitlana" uniqKey="Yablonska S" first="Svitlana" last="Yablonska">Svitlana Yablonska</name>
<name sortKey="Yano, Hiroko" sort="Yano, Hiroko" uniqKey="Yano H" first="Hiroko" last="Yano">Hiroko Yano</name>
<name sortKey="Yano, Hiroko" sort="Yano, Hiroko" uniqKey="Yano H" first="Hiroko" last="Yano">Hiroko Yano</name>
<name sortKey="Yano, Hiroko" sort="Yano, Hiroko" uniqKey="Yano H" first="Hiroko" last="Yano">Hiroko Yano</name>
</country>
</tree>
</affiliations>
</record>

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