La maladie de Parkinson au Canada (serveur d'exploration)

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VMAT2 binding is elevated in dopa-responsive dystonia: visualizing empty vesicles by PET.

Identifieur interne : 001342 ( PubMed/Checkpoint ); précédent : 001341; suivant : 001343

VMAT2 binding is elevated in dopa-responsive dystonia: visualizing empty vesicles by PET.

Auteurs : Raúl De La Fuente-Fernández [Canada] ; Sarah Furtado ; Mark Guttman ; Yoshiaki Furukawa ; Chong S. Lee ; Donald B. Calne ; Thomas J. Ruth ; A Jon Stoessl

Source :

RBID : pubmed:12710012

English descriptors

Abstract

Dopa-responsive dystonia (DRD) is a lifelong disorder in which dopamine deficiency is not associated with neuronal loss and therefore it is an ideal human model for investigating the compensatory changes that occur in response to this biochemical abnormality. Using positron emission tomography (PET), we examined the (+/-)-alpha-[(11)C]dihydrotetrabenazine ([(11)C]DTBZ) binding potential of untreated DRD patients and normal controls. Two other PET markers of presynaptic nigrostriatal function, d-threo-[(11)C]methylphenidate ([(11)C]MP) and 6-[(18)F]fluoro-L-dopa ([(18)F]-dopa), and [(11)C]raclopride were also used in the study. We found increased [(11)C]DTBZ binding potential in the striatum of DRD patients. By contrast, no significant changes were detected in either [(11)C]MP binding potential or [(18)F]-dopa uptake rate constant. In addition, we found evidence for increased dopamine turnover in one DRD patient by examining changes in [(11)C]raclopride binding potential in relation to levodopa treatment. We propose that the increase in [(11)C]DTBZ binding likely reflects the dramatic decrease in the intravesicular concentration of dopamine that occurs in DRD; upregulation of vesicular monoamine transporter type 2 (VMAT2) expression may also contribute. Our findings suggest that the striatal expression of VMAT2 (as estimated by [(11)C]DTBZ binding) is not coregulated with dopamine synthesis. This is in keeping with a role for VMAT2 in other cellular processes (i.e., sequestration and release from the cell of potential toxic products), in addition to its importance for the quantal release of monoamines.

DOI: 10.1002/syn.10199
PubMed: 12710012


Affiliations:


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pubmed:12710012

Le document en format XML

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<div type="abstract" xml:lang="en">Dopa-responsive dystonia (DRD) is a lifelong disorder in which dopamine deficiency is not associated with neuronal loss and therefore it is an ideal human model for investigating the compensatory changes that occur in response to this biochemical abnormality. Using positron emission tomography (PET), we examined the (+/-)-alpha-[(11)C]dihydrotetrabenazine ([(11)C]DTBZ) binding potential of untreated DRD patients and normal controls. Two other PET markers of presynaptic nigrostriatal function, d-threo-[(11)C]methylphenidate ([(11)C]MP) and 6-[(18)F]fluoro-L-dopa ([(18)F]-dopa), and [(11)C]raclopride were also used in the study. We found increased [(11)C]DTBZ binding potential in the striatum of DRD patients. By contrast, no significant changes were detected in either [(11)C]MP binding potential or [(18)F]-dopa uptake rate constant. In addition, we found evidence for increased dopamine turnover in one DRD patient by examining changes in [(11)C]raclopride binding potential in relation to levodopa treatment. We propose that the increase in [(11)C]DTBZ binding likely reflects the dramatic decrease in the intravesicular concentration of dopamine that occurs in DRD; upregulation of vesicular monoamine transporter type 2 (VMAT2) expression may also contribute. Our findings suggest that the striatal expression of VMAT2 (as estimated by [(11)C]DTBZ binding) is not coregulated with dopamine synthesis. This is in keeping with a role for VMAT2 in other cellular processes (i.e., sequestration and release from the cell of potential toxic products), in addition to its importance for the quantal release of monoamines.</div>
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<AbstractText>Dopa-responsive dystonia (DRD) is a lifelong disorder in which dopamine deficiency is not associated with neuronal loss and therefore it is an ideal human model for investigating the compensatory changes that occur in response to this biochemical abnormality. Using positron emission tomography (PET), we examined the (+/-)-alpha-[(11)C]dihydrotetrabenazine ([(11)C]DTBZ) binding potential of untreated DRD patients and normal controls. Two other PET markers of presynaptic nigrostriatal function, d-threo-[(11)C]methylphenidate ([(11)C]MP) and 6-[(18)F]fluoro-L-dopa ([(18)F]-dopa), and [(11)C]raclopride were also used in the study. We found increased [(11)C]DTBZ binding potential in the striatum of DRD patients. By contrast, no significant changes were detected in either [(11)C]MP binding potential or [(18)F]-dopa uptake rate constant. In addition, we found evidence for increased dopamine turnover in one DRD patient by examining changes in [(11)C]raclopride binding potential in relation to levodopa treatment. We propose that the increase in [(11)C]DTBZ binding likely reflects the dramatic decrease in the intravesicular concentration of dopamine that occurs in DRD; upregulation of vesicular monoamine transporter type 2 (VMAT2) expression may also contribute. Our findings suggest that the striatal expression of VMAT2 (as estimated by [(11)C]DTBZ binding) is not coregulated with dopamine synthesis. This is in keeping with a role for VMAT2 in other cellular processes (i.e., sequestration and release from the cell of potential toxic products), in addition to its importance for the quantal release of monoamines.</AbstractText>
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<name sortKey="Lee, Chong S" sort="Lee, Chong S" uniqKey="Lee C" first="Chong S" last="Lee">Chong S. Lee</name>
<name sortKey="Ruth, Thomas J" sort="Ruth, Thomas J" uniqKey="Ruth T" first="Thomas J" last="Ruth">Thomas J. Ruth</name>
<name sortKey="Stoessl, A Jon" sort="Stoessl, A Jon" uniqKey="Stoessl A" first="A Jon" last="Stoessl">A Jon Stoessl</name>
</noCountry>
<country name="Canada">
<noRegion>
<name sortKey="De La Fuente Fernandez, Raul" sort="De La Fuente Fernandez, Raul" uniqKey="De La Fuente Fernandez R" first="Raúl" last="De La Fuente-Fernández">Raúl De La Fuente-Fernández</name>
</noRegion>
</country>
</tree>
</affiliations>
</record>

Pour manipuler ce document sous Unix (Dilib)

EXPLOR_STEP=$WICRI_ROOT/Wicri/Canada/explor/ParkinsonCanadaV1/Data/PubMed/Checkpoint
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 001342 | SxmlIndent | more

Ou

HfdSelect -h $EXPLOR_AREA/Data/PubMed/Checkpoint/biblio.hfd -nk 001342 | SxmlIndent | more

Pour mettre un lien sur cette page dans le réseau Wicri

{{Explor lien
   |wiki=    Wicri/Canada
   |area=    ParkinsonCanadaV1
   |flux=    PubMed
   |étape=   Checkpoint
   |type=    RBID
   |clé=     pubmed:12710012
   |texte=   VMAT2 binding is elevated in dopa-responsive dystonia: visualizing empty vesicles by PET.
}}

Pour générer des pages wiki

HfdIndexSelect -h $EXPLOR_AREA/Data/PubMed/Checkpoint/RBID.i   -Sk "pubmed:12710012" \
       | HfdSelect -Kh $EXPLOR_AREA/Data/PubMed/Checkpoint/biblio.hfd   \
       | NlmPubMed2Wicri -a ParkinsonCanadaV1 

Wicri

This area was generated with Dilib version V0.6.29.
Data generation: Thu May 4 22:20:19 2017. Site generation: Fri Dec 23 23:17:26 2022