La maladie de Parkinson en France (serveur d'exploration)

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SMF-1, SMF-2 and SMF-3 DMT1 Orthologues Regulate and Are Regulated Differentially by Manganese Levels in C. elegans

Identifieur interne : 001E88 ( Main/Exploration ); précédent : 001E87; suivant : 001E89

SMF-1, SMF-2 and SMF-3 DMT1 Orthologues Regulate and Are Regulated Differentially by Manganese Levels in C. elegans

Auteurs : Catherine Au [États-Unis] ; Alexandre Benedetto [États-Unis, Royaume-Uni] ; Joel Anderson [États-Unis] ; Arnaud Labrousse [France] ; Keith Erikson [États-Unis] ; Jonathan J. Ewbank [France] ; Michael Aschner [États-Unis]

Source :

RBID : PMC:2773845

Abstract

Manganese (Mn) is an essential metal that can exert toxic effects at high concentrations, eventually leading to Parkinsonism. A major transporter of Mn in mammals is the divalent-metal transporter (DMT1). We characterize here DMT1-like proteins in the nematode C. elegans, which regulate and are regulated by Mn and iron (Fe) content. We identified three new DMT1-like genes in C. elegans: smf-1, smf-2 and smf-3. All three can functionally substitute for loss of their yeast orthologues in S. cerevisiae. In the worm, deletion of smf-1 or smf-3 led to an increased Mn tolerance, while loss of smf-2 led to increased Mn sensitivity. smf mRNA levels measured by QRT-PCR were up-regulated upon low Mn and down-regulated upon high Mn exposures. Translational GFP-fusions revealed that SMF-1 and SMF-3 strongly localize to partially overlapping apical regions of the gut epithelium, suggesting a differential role for SMF-1 and SMF-3 in Mn nutritional intake. Conversely, SMF-2 was detected in the marginal pharyngeal epithelium, possibly involved in metal-sensing. Analysis of metal content upon Mn exposure in smf mutants revealed that SMF-3 is required for normal Mn uptake, while smf-1 was dispensable. Higher smf-2 mRNA levels correlated with higher Fe content, supporting a role for SMF-2 in Fe uptake. In smf-1 and smf-3 but not in smf-2 mutants, increased Mn exposure led to decreased Fe levels, suggesting that both metals compete for transport by SMF-2. Finally, SMF-3 was post-translationally and reversibly down-regulated following Mn-exposure. In sum, we unraveled a complex interplay of transcriptional and post-translational regulations of 3 DMT1-like transporters in two adjacent tissues, which regulate metal-content in C. elegans.


Url:
DOI: 10.1371/journal.pone.0007792
PubMed: 19924247
PubMed Central: 2773845


Affiliations:


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<front>
<div type="abstract" xml:lang="en">
<p>Manganese (Mn) is an essential metal that can exert toxic effects at high concentrations, eventually leading to Parkinsonism. A major transporter of Mn in mammals is the divalent-metal transporter (DMT1). We characterize here DMT1-like proteins in the nematode
<italic>C. elegans</italic>
, which regulate and are regulated by Mn and iron (Fe) content. We identified three new DMT1-like genes in
<italic>C. elegans</italic>
:
<italic>smf-1</italic>
,
<italic>smf-2</italic>
and
<italic>smf-3</italic>
. All three can functionally substitute for loss of their yeast orthologues in
<italic>S. cerevisiae</italic>
. In the worm, deletion of
<italic>smf-1</italic>
or
<italic>smf-3</italic>
led to an increased Mn tolerance, while loss of
<italic>smf-2</italic>
led to increased Mn sensitivity.
<italic>smf</italic>
mRNA levels measured by QRT-PCR were up-regulated upon low Mn and down-regulated upon high Mn exposures. Translational GFP-fusions revealed that SMF-1 and SMF-3 strongly localize to partially overlapping apical regions of the gut epithelium, suggesting a differential role for SMF-1 and SMF-3 in Mn nutritional intake. Conversely, SMF-2 was detected in the marginal pharyngeal epithelium, possibly involved in metal-sensing. Analysis of metal content upon Mn exposure in
<italic>smf</italic>
mutants revealed that SMF-3 is required for normal Mn uptake, while
<italic>smf-1</italic>
was dispensable. Higher
<italic>smf-2</italic>
mRNA levels correlated with higher Fe content, supporting a role for SMF-2 in Fe uptake. In
<italic>smf-1</italic>
and
<italic>smf-3</italic>
but not in
<italic>smf-2</italic>
mutants, increased Mn exposure led to decreased Fe levels, suggesting that both metals compete for transport by SMF-2. Finally, SMF-3 was post-translationally and reversibly down-regulated following Mn-exposure. In sum, we unraveled a complex interplay of transcriptional and post-translational regulations of 3 DMT1-like transporters in two adjacent tissues, which regulate metal-content in
<italic>C. elegans</italic>
.</p>
</div>
</front>
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</back>
</TEI>
<affiliations>
<list>
<country>
<li>France</li>
<li>Royaume-Uni</li>
<li>États-Unis</li>
</country>
<region>
<li>Angleterre</li>
<li>Caroline du Nord</li>
<li>Grand Londres</li>
<li>Midi-Pyrénées</li>
<li>Occitanie (région administrative)</li>
<li>Provence-Alpes-Côte d'Azur</li>
<li>Tennessee</li>
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<settlement>
<li>Londres</li>
<li>Marseille</li>
<li>Toulouse</li>
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<orgName>
<li>University College de Londres</li>
<li>Université de la Méditerranée</li>
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</list>
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<country name="États-Unis">
<region name="Tennessee">
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<name sortKey="Benedetto, Alexandre" sort="Benedetto, Alexandre" uniqKey="Benedetto A" first="Alexandre" last="Benedetto">Alexandre Benedetto</name>
<name sortKey="Erikson, Keith" sort="Erikson, Keith" uniqKey="Erikson K" first="Keith" last="Erikson">Keith Erikson</name>
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<country name="Royaume-Uni">
<region name="Angleterre">
<name sortKey="Benedetto, Alexandre" sort="Benedetto, Alexandre" uniqKey="Benedetto A" first="Alexandre" last="Benedetto">Alexandre Benedetto</name>
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</country>
<country name="France">
<region name="Provence-Alpes-Côte d'Azur">
<name sortKey="Labrousse, Arnaud" sort="Labrousse, Arnaud" uniqKey="Labrousse A" first="Arnaud" last="Labrousse">Arnaud Labrousse</name>
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<name sortKey="Ewbank, Jonathan J" sort="Ewbank, Jonathan J" uniqKey="Ewbank J" first="Jonathan J." last="Ewbank">Jonathan J. Ewbank</name>
<name sortKey="Ewbank, Jonathan J" sort="Ewbank, Jonathan J" uniqKey="Ewbank J" first="Jonathan J." last="Ewbank">Jonathan J. Ewbank</name>
<name sortKey="Ewbank, Jonathan J" sort="Ewbank, Jonathan J" uniqKey="Ewbank J" first="Jonathan J." last="Ewbank">Jonathan J. Ewbank</name>
<name sortKey="Labrousse, Arnaud" sort="Labrousse, Arnaud" uniqKey="Labrousse A" first="Arnaud" last="Labrousse">Arnaud Labrousse</name>
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<name sortKey="Labrousse, Arnaud" sort="Labrousse, Arnaud" uniqKey="Labrousse A" first="Arnaud" last="Labrousse">Arnaud Labrousse</name>
</country>
</tree>
</affiliations>
</record>

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   |texte=   SMF-1, SMF-2 and SMF-3 DMT1 Orthologues Regulate and Are Regulated Differentially by Manganese Levels in C. elegans
}}

Pour générer des pages wiki

HfdIndexSelect -h $EXPLOR_AREA/Data/Main/Exploration/RBID.i   -Sk "pubmed:19924247" \
       | HfdSelect -Kh $EXPLOR_AREA/Data/Main/Exploration/biblio.hfd   \
       | NlmPubMed2Wicri -a ParkinsonFranceV1 

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