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

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In vivo measurement of density and affinity of the monoamine vesicular transporter in a unilateral 6-hydroxydopamine rat model of PD

Identifieur interne : 000646 ( PascalFrancis/Checkpoint ); précédent : 000645; suivant : 000647

In vivo measurement of density and affinity of the monoamine vesicular transporter in a unilateral 6-hydroxydopamine rat model of PD

Auteurs : Vesna Sossi [Canada] ; James E. Holden [États-Unis] ; Geoffrey J. Topping [Canada] ; Marie-Laure Camborde [Canada] ; Rich A. Kornelsen [Canada] ; Siobhan E. Mccormick [Canada] ; Jennifer Greene [Canada] ; Andrei R. Studenov [Canada] ; Thomas J. Ruth [Canada] ; Doris J. Doudet [Canada]

Source :

RBID : Pascal:08-0028082

Descripteurs français

English descriptors

Abstract

This is the first in vivo determination of the vesicular monoamine transporter (VMAT2) density (Bmax) and ligand-transporter affinity (Kappd) in six unilaterally 6-hydroxydopamine (6-OHDA) lesioned rats using micro-positron emission tomography (PET) imaging with [11C]-(+)-α-dihydrotetrabenazine (DTBZ). A multiple ligand concentration transporter assay (MLCTA) was used to determine a Bmax value of 178±32pmol/mL and a Kappd of 47.7±9.3pmol/mL for the non-lesioned side and 30.52±5.84 and 43.4±15.52pmol/mL for the lesioned side, respectively. While Bmax was significantly different between the two sides, no significant difference was observed for the Kappd. In addition to demonstrating the feasibility of in vivo Scatchard analysis in rats, these data confirm the expectation that a 6-OHDA lesion does not affect the affinity; a much simpler binding potential (BP) measure can thus be used as a marker of lesion severity (LS) in this rat model of Parkinson's disease. A transporter occupancy curve demonstrated negligible transporter occupancy (∼1%) at a specific activity (SA) of 1100nCI/pmol (assuming an injected dose of 100μCi/100g), while 10% occupancy was estimated at 100nCi/pmol. An indirect measurement indicated that the degree of occupancy as a function of SA is independent of LS. Finally, BP measurement reproducibility was assessed and found to be 11%±7% for the healthy and 8%±12% for the lesioned side. Quantitative PET results can thus be obtained even for severely lesioned animals with the striatum on one side not clearly visible provided accurate image analysis methods are used.


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Pascal:08-0028082

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<div type="abstract" xml:lang="en">This is the first in vivo determination of the vesicular monoamine transporter (VMAT2) density (B
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<sub>d</sub>
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<sup>11</sup>
C]-(+)-α-dihydrotetrabenazine (DTBZ). A multiple ligand concentration transporter assay (MLCTA) was used to determine a B
<sub>max</sub>
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<sup>app</sup>
<sub>d</sub>
of 47.7±9.3pmol/mL for the non-lesioned side and 30.52±5.84 and 43.4±15.52pmol/mL for the lesioned side, respectively. While B
<sub>max</sub>
was significantly different between the two sides, no significant difference was observed for the K
<sup>app</sup>
<sub>d</sub>
. In addition to demonstrating the feasibility of in vivo Scatchard analysis in rats, these data confirm the expectation that a 6-OHDA lesion does not affect the affinity; a much simpler binding potential (BP) measure can thus be used as a marker of lesion severity (LS) in this rat model of Parkinson's disease. A transporter occupancy curve demonstrated negligible transporter occupancy (∼1%) at a specific activity (SA) of 1100nCI/pmol (assuming an injected dose of 100μCi/100g), while 10% occupancy was estimated at 100nCi/pmol. An indirect measurement indicated that the degree of occupancy as a function of SA is independent of LS. Finally, BP measurement reproducibility was assessed and found to be 11%±7% for the healthy and 8%±12% for the lesioned side. Quantitative PET results can thus be obtained even for severely lesioned animals with the striatum on one side not clearly visible provided accurate image analysis methods are used.</div>
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<sup>11</sup>
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<sub>max</sub>
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<sup>app</sup>
<sub>d</sub>
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<sub>max</sub>
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<sup>app</sup>
<sub>d</sub>
. In addition to demonstrating the feasibility of in vivo Scatchard analysis in rats, these data confirm the expectation that a 6-OHDA lesion does not affect the affinity; a much simpler binding potential (BP) measure can thus be used as a marker of lesion severity (LS) in this rat model of Parkinson's disease. A transporter occupancy curve demonstrated negligible transporter occupancy (∼1%) at a specific activity (SA) of 1100nCI/pmol (assuming an injected dose of 100μCi/100g), while 10% occupancy was estimated at 100nCi/pmol. An indirect measurement indicated that the degree of occupancy as a function of SA is independent of LS. Finally, BP measurement reproducibility was assessed and found to be 11%±7% for the healthy and 8%±12% for the lesioned side. Quantitative PET results can thus be obtained even for severely lesioned animals with the striatum on one side not clearly visible provided accurate image analysis methods are used.</s0>
</fC01>
<fC02 i1="01" i2="X">
<s0>002B17C</s0>
</fC02>
<fC02 i1="02" i2="X">
<s0>002B02B10</s0>
</fC02>
<fC02 i1="03" i2="X">
<s0>002B27A05C</s0>
</fC02>
<fC03 i1="01" i2="X" l="FRE">
<s0>Pathologie du système nerveux</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="X" l="ENG">
<s0>Nervous system diseases</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="X" l="SPA">
<s0>Sistema nervioso patología</s0>
<s5>01</s5>
</fC03>
<fC03 i1="02" i2="X" l="FRE">
<s0>Pathologie cérébrovasculaire</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="X" l="ENG">
<s0>Cerebrovascular disease</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="X" l="SPA">
<s0>Vaso sanguíneo encéfalo patología</s0>
<s5>02</s5>
</fC03>
<fC03 i1="03" i2="X" l="FRE">
<s0>Mesure densité</s0>
<s5>09</s5>
</fC03>
<fC03 i1="03" i2="X" l="ENG">
<s0>Density measurement</s0>
<s5>09</s5>
</fC03>
<fC03 i1="03" i2="X" l="SPA">
<s0>Medición densidad</s0>
<s5>09</s5>
</fC03>
<fC03 i1="04" i2="X" l="FRE">
<s0>Animal</s0>
<s5>10</s5>
</fC03>
<fC03 i1="04" i2="X" l="ENG">
<s0>Animal</s0>
<s5>10</s5>
</fC03>
<fC03 i1="04" i2="X" l="SPA">
<s0>Animal</s0>
<s5>10</s5>
</fC03>
<fC03 i1="05" i2="X" l="FRE">
<s0>Rat</s0>
<s5>11</s5>
</fC03>
<fC03 i1="05" i2="X" l="ENG">
<s0>Rat</s0>
<s5>11</s5>
</fC03>
<fC03 i1="05" i2="X" l="SPA">
<s0>Rata</s0>
<s5>11</s5>
</fC03>
<fC07 i1="01" i2="X" l="FRE">
<s0>Rodentia</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="01" i2="X" l="ENG">
<s0>Rodentia</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="01" i2="X" l="SPA">
<s0>Rodentia</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="02" i2="X" l="FRE">
<s0>Mammalia</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="02" i2="X" l="ENG">
<s0>Mammalia</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="02" i2="X" l="SPA">
<s0>Mammalia</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="03" i2="X" l="FRE">
<s0>Vertebrata</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="03" i2="X" l="ENG">
<s0>Vertebrata</s0>
<s2>NS</s2>
</fC07>
<fC07 i1="03" i2="X" l="SPA">
<s0>Vertebrata</s0>
<s2>NS</s2>
</fC07>
<fN21>
<s1>052</s1>
</fN21>
<fN44 i1="01">
<s1>OTO</s1>
</fN44>
<fN82>
<s1>OTO</s1>
</fN82>
</pA>
</standard>
</inist>
<affiliations>
<list>
<country>
<li>Canada</li>
<li>États-Unis</li>
</country>
<region>
<li>Wisconsin</li>
</region>
</list>
<tree>
<country name="Canada">
<noRegion>
<name sortKey="Sossi, Vesna" sort="Sossi, Vesna" uniqKey="Sossi V" first="Vesna" last="Sossi">Vesna Sossi</name>
</noRegion>
<name sortKey="Camborde, Marie Laure" sort="Camborde, Marie Laure" uniqKey="Camborde M" first="Marie-Laure" last="Camborde">Marie-Laure Camborde</name>
<name sortKey="Doudet, Doris J" sort="Doudet, Doris J" uniqKey="Doudet D" first="Doris J." last="Doudet">Doris J. Doudet</name>
<name sortKey="Greene, Jennifer" sort="Greene, Jennifer" uniqKey="Greene J" first="Jennifer" last="Greene">Jennifer Greene</name>
<name sortKey="Kornelsen, Rich A" sort="Kornelsen, Rich A" uniqKey="Kornelsen R" first="Rich A." last="Kornelsen">Rich A. Kornelsen</name>
<name sortKey="Mccormick, Siobhan E" sort="Mccormick, Siobhan E" uniqKey="Mccormick S" first="Siobhan E." last="Mccormick">Siobhan E. Mccormick</name>
<name sortKey="Ruth, Thomas J" sort="Ruth, Thomas J" uniqKey="Ruth T" first="Thomas J." last="Ruth">Thomas J. Ruth</name>
<name sortKey="Studenov, Andrei R" sort="Studenov, Andrei R" uniqKey="Studenov A" first="Andrei R." last="Studenov">Andrei R. Studenov</name>
<name sortKey="Topping, Geoffrey J" sort="Topping, Geoffrey J" uniqKey="Topping G" first="Geoffrey J." last="Topping">Geoffrey J. Topping</name>
</country>
<country name="États-Unis">
<region name="Wisconsin">
<name sortKey="Holden, James E" sort="Holden, James E" uniqKey="Holden J" first="James E." last="Holden">James E. Holden</name>
</region>
</country>
</tree>
</affiliations>
</record>

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