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

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Combined insular and striatal dopamine dysfunction are associated with executive deficits in Parkinson's disease with mild cognitive impairment

Identifieur interne : 000C09 ( Main/Exploration ); précédent : 000C08; suivant : 000C10

Combined insular and striatal dopamine dysfunction are associated with executive deficits in Parkinson's disease with mild cognitive impairment

Auteurs : Leigh Christopher [Canada] ; Connie Marras [Canada] ; Sarah Duff-Canning [Canada] ; Yuko Koshimori [Canada] ; Robert Chen [Canada] ; Isabelle Boileau [Canada] ; Barbara Segura [Canada, Espagne] ; Oury Monchi [Canada] ; Anthony E. Lang [Canada] ; Pablo Rusjan [Canada] ; Sylvain Houle [Canada] ; Antonio P. Strafella [Canada]

Source :

RBID : Pascal:14-0052747

Descripteurs français

English descriptors

Abstract

The ability to dynamically use various aspects of cognition is essential to daily function, and reliant on dopaminergic transmission in cortico-striatal circuitry. Our aim was to investigate both striatal and cortical dopaminergic changes in patients with Parkinson's disease with mild cognitive impairment, who represent a vulnerable group for the development of dementia. We hypothesized severe striatal dopamine denervation in the associative (i.e. cognitive) region and cortical D2 receptor abnormalities in the salience and executive networks in Parkinson's disease with mild cognitive impairment compared with cognitively normal patients with Parkinson's disease and healthy control subjects. We used positron emission tomography imaging with dopaminergic ligands 11C-dihydrotetrabenazine, to investigate striatal dopamine neuron integrity in the associative subdivision and 11C-FLB 457, to investigate cortical D2 receptor availability in patients with Parkinson's disease (55-80 years of age) with mild cognitive impairment (n = 11), cognitively normal patients with Parkinson's disease (n = 11) and age-matched healthy control subjects (n = 14). Subjects were administered a neuropsychological test battery to assess cognitive status and determine the relationship between dopaminergic changes and cognitive performance. We found that patients with mild cognitive impairment had severe striatal dopamine depletion in the associative (i.e. cognitive) subdivision as well as reduced D2 receptor availability in the bilateral insula, a key cognitive hub, compared to cognitively normal patients and healthy subjects after controlling for age, disease severity and daily dopaminergic medication intake. Associative striatal dopamine depletion was predictive of D2 receptor loss in the insula of patients with Parkinson's disease with mild cognitive impairment, demonstrating interrelated striatal and cortical changes. Insular D2 levels also predicted executive abilities in these patients as measured using a composite executive z-score obtained from neuropsychological testing. Furthermore we assessed cortical thickness to ensure that D2 receptor changes were not confounded by brain atrophy. There was no difference between groups in cortical thickness in the insula, or any other cortical region of interest. These findings suggest that striatal dopamine denervation combined with insular D2 receptor loss underlie mild cognitive impairment in Parkinson's disease and in particular decline in executive function. Furthermore, these findings suggest a crucial and direct role for dopaminergic modulation in the insula in facilitating cognitive function.


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<name sortKey="Strafella, Antonio P" sort="Strafella, Antonio P" uniqKey="Strafella A" first="Antonio P." last="Strafella">Antonio P. Strafella</name>
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</analytic>
<series>
<title level="j" type="main">Brain</title>
<title level="j" type="abbreviated">Brain</title>
<idno type="ISSN">0006-8950</idno>
<imprint>
<date when="2014">2014</date>
</imprint>
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<seriesStmt>
<title level="j" type="main">Brain</title>
<title level="j" type="abbreviated">Brain</title>
<idno type="ISSN">0006-8950</idno>
</seriesStmt>
</fileDesc>
<profileDesc>
<textClass>
<keywords scheme="KwdEn" xml:lang="en">
<term>Cognitive disorder</term>
<term>Dopamine</term>
<term>Emission tomography</term>
<term>Nervous system diseases</term>
<term>Parkinson disease</term>
<term>Positron emission tomography</term>
<term>mild cognitive impairment</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr">
<term>Trouble cognitif</term>
<term>Maladie de Parkinson</term>
<term>Déficit cognitif léger</term>
<term>Pathologie du système nerveux</term>
<term>Dopamine</term>
<term>Tomoscintigraphie</term>
<term>Tomographie par émission de positons</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front>
<div type="abstract" xml:lang="en">The ability to dynamically use various aspects of cognition is essential to daily function, and reliant on dopaminergic transmission in cortico-striatal circuitry. Our aim was to investigate both striatal and cortical dopaminergic changes in patients with Parkinson's disease with mild cognitive impairment, who represent a vulnerable group for the development of dementia. We hypothesized severe striatal dopamine denervation in the associative (i.e. cognitive) region and cortical D2 receptor abnormalities in the salience and executive networks in Parkinson's disease with mild cognitive impairment compared with cognitively normal patients with Parkinson's disease and healthy control subjects. We used positron emission tomography imaging with dopaminergic ligands
<sup>11</sup>
C-dihydrotetrabenazine, to investigate striatal dopamine neuron integrity in the associative subdivision and
<sup>11</sup>
C-FLB 457, to investigate cortical D2 receptor availability in patients with Parkinson's disease (55-80 years of age) with mild cognitive impairment (n = 11), cognitively normal patients with Parkinson's disease (n = 11) and age-matched healthy control subjects (n = 14). Subjects were administered a neuropsychological test battery to assess cognitive status and determine the relationship between dopaminergic changes and cognitive performance. We found that patients with mild cognitive impairment had severe striatal dopamine depletion in the associative (i.e. cognitive) subdivision as well as reduced D2 receptor availability in the bilateral insula, a key cognitive hub, compared to cognitively normal patients and healthy subjects after controlling for age, disease severity and daily dopaminergic medication intake. Associative striatal dopamine depletion was predictive of D2 receptor loss in the insula of patients with Parkinson's disease with mild cognitive impairment, demonstrating interrelated striatal and cortical changes. Insular D2 levels also predicted executive abilities in these patients as measured using a composite executive z-score obtained from neuropsychological testing. Furthermore we assessed cortical thickness to ensure that D2 receptor changes were not confounded by brain atrophy. There was no difference between groups in cortical thickness in the insula, or any other cortical region of interest. These findings suggest that striatal dopamine denervation combined with insular D2 receptor loss underlie mild cognitive impairment in Parkinson's disease and in particular decline in executive function. Furthermore, these findings suggest a crucial and direct role for dopaminergic modulation in the insula in facilitating cognitive function.</div>
</front>
</TEI>
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<list>
<country>
<li>Canada</li>
<li>Espagne</li>
</country>
<region>
<li>Ontario</li>
</region>
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<li>Toronto</li>
</settlement>
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<li>Université de Toronto</li>
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<name sortKey="Christopher, Leigh" sort="Christopher, Leigh" uniqKey="Christopher L" first="Leigh" last="Christopher">Leigh Christopher</name>
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<name sortKey="Boileau, Isabelle" sort="Boileau, Isabelle" uniqKey="Boileau I" first="Isabelle" last="Boileau">Isabelle Boileau</name>
<name sortKey="Chen, Robert" sort="Chen, Robert" uniqKey="Chen R" first="Robert" last="Chen">Robert Chen</name>
<name sortKey="Christopher, Leigh" sort="Christopher, Leigh" uniqKey="Christopher L" first="Leigh" last="Christopher">Leigh Christopher</name>
<name sortKey="Christopher, Leigh" sort="Christopher, Leigh" uniqKey="Christopher L" first="Leigh" last="Christopher">Leigh Christopher</name>
<name sortKey="Duff Canning, Sarah" sort="Duff Canning, Sarah" uniqKey="Duff Canning S" first="Sarah" last="Duff-Canning">Sarah Duff-Canning</name>
<name sortKey="Duff Canning, Sarah" sort="Duff Canning, Sarah" uniqKey="Duff Canning S" first="Sarah" last="Duff-Canning">Sarah Duff-Canning</name>
<name sortKey="Houle, Sylvain" sort="Houle, Sylvain" uniqKey="Houle S" first="Sylvain" last="Houle">Sylvain Houle</name>
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<name sortKey="Koshimori, Yuko" sort="Koshimori, Yuko" uniqKey="Koshimori Y" first="Yuko" last="Koshimori">Yuko Koshimori</name>
<name sortKey="Lang, Anthony E" sort="Lang, Anthony E" uniqKey="Lang A" first="Anthony E." last="Lang">Anthony E. Lang</name>
<name sortKey="Marras, Connie" sort="Marras, Connie" uniqKey="Marras C" first="Connie" last="Marras">Connie Marras</name>
<name sortKey="Monchi, Oury" sort="Monchi, Oury" uniqKey="Monchi O" first="Oury" last="Monchi">Oury Monchi</name>
<name sortKey="Rusjan, Pablo" sort="Rusjan, Pablo" uniqKey="Rusjan P" first="Pablo" last="Rusjan">Pablo Rusjan</name>
<name sortKey="Segura, Barbara" sort="Segura, Barbara" uniqKey="Segura B" first="Barbara" last="Segura">Barbara Segura</name>
<name sortKey="Segura, Barbara" sort="Segura, Barbara" uniqKey="Segura B" first="Barbara" last="Segura">Barbara Segura</name>
<name sortKey="Strafella, Antonio P" sort="Strafella, Antonio P" uniqKey="Strafella A" first="Antonio P." last="Strafella">Antonio P. Strafella</name>
<name sortKey="Strafella, Antonio P" sort="Strafella, Antonio P" uniqKey="Strafella A" first="Antonio P." last="Strafella">Antonio P. Strafella</name>
<name sortKey="Strafella, Antonio P" sort="Strafella, Antonio P" uniqKey="Strafella A" first="Antonio P." last="Strafella">Antonio P. Strafella</name>
</country>
<country name="Espagne">
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<name sortKey="Segura, Barbara" sort="Segura, Barbara" uniqKey="Segura B" first="Barbara" last="Segura">Barbara Segura</name>
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</record>

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