Characterization of [123I]FP-CIT binding to the dopamine transporter in the striatum of tree shrews by quantitative in vitro autoradiography

ABSTRACT Objectives Aim of this study was to quantify the binding of [123I]FP‐CIT in striatum of healthy tree shrews. [123I]FP‐CIT is widely used in clinical SPECT imaging to reveal nigrostriatal degeneration in aid of the diagnosis of clinically uncertain parkinsonian syndromes. Despite its wide cl...

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Veröffentlicht in:Synapse (New York, N.Y.) N.Y.), 2015-10, Vol.69 (10), p.497-504
Hauptverfasser: Geisler, Stefanie, Beindorff, Nicola, Cremer, Markus, Hoffmann, Kerstin, Brenner, Winfried, Cumming, Paul, Meyer, Philipp T., Langen, Karl-Josef, Fuchs, Eberhard, Buchert, Ralph
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container_issue 10
container_start_page 497
container_title Synapse (New York, N.Y.)
container_volume 69
creator Geisler, Stefanie
Beindorff, Nicola
Cremer, Markus
Hoffmann, Kerstin
Brenner, Winfried
Cumming, Paul
Meyer, Philipp T.
Langen, Karl-Josef
Fuchs, Eberhard
Buchert, Ralph
description ABSTRACT Objectives Aim of this study was to quantify the binding of [123I]FP‐CIT in striatum of healthy tree shrews. [123I]FP‐CIT is widely used in clinical SPECT imaging to reveal nigrostriatal degeneration in aid of the diagnosis of clinically uncertain parkinsonian syndromes. Despite its wide clinical use, the saturation binding parameters of [123I]FP‐CIT for the dopamine transporter (DAT) have not yet been determined in any mammalian brain. Tree shrews are genetically and neuroanatomically more similar to humans than are rodents and might therefore be a valuable animal model for research of neurological disorders involving brain dopamine. Experimental Design Quantitative in vitro autoradiography with [123I]FP‐CIT was performed with brains of healthy tree shrews and, for comparison, brains of healthy rats. Dopamine D2/3 receptor autoradiography with [3H]raclopride was also performed. Principal observations Saturation analysis revealed high specificity of [123I]FP‐CIT for DAT in the striatum with considerably higher affinity in tree shrews than in rats (KD = 10.3 versus 36.4 nM). The density of DAT binding sites also was higher in tree shrews than in rats (Bmax = 2499 versus 1495 pmol/g wet weight (ww)). [3H]raclopride revealed D2/3 receptors in the tree shrew striatum with about the same density as in rats (Bmax = 78.4 versus 84.1 pmol/g ww), but with slightly lower affinity in tree shrews (KD = 1.27 versus 0.59 nM). Conlusions The higher affinity in combination with the higher abundance of DAT binding sites compared to rat striatum predicts substantially higher binding of [123I]FP‐CIT in SPECT studies of living tree shrews. Synapse 69:497–504, 2015. © 2015 Wiley Periodicals, Inc. Using in vitro autoradiography, the authors characterize the binding of [123I]FP‐CIT to striatal dopamine transporters in tree shrew compared to rat. This is the first report of the dissociation constant of [123I]FP‐CIT for the dopamine transporter in mammalian brain.
doi_str_mv 10.1002/syn.21838
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[123I]FP‐CIT is widely used in clinical SPECT imaging to reveal nigrostriatal degeneration in aid of the diagnosis of clinically uncertain parkinsonian syndromes. Despite its wide clinical use, the saturation binding parameters of [123I]FP‐CIT for the dopamine transporter (DAT) have not yet been determined in any mammalian brain. Tree shrews are genetically and neuroanatomically more similar to humans than are rodents and might therefore be a valuable animal model for research of neurological disorders involving brain dopamine. Experimental Design Quantitative in vitro autoradiography with [123I]FP‐CIT was performed with brains of healthy tree shrews and, for comparison, brains of healthy rats. Dopamine D2/3 receptor autoradiography with [3H]raclopride was also performed. Principal observations Saturation analysis revealed high specificity of [123I]FP‐CIT for DAT in the striatum with considerably higher affinity in tree shrews than in rats (KD = 10.3 versus 36.4 nM). The density of DAT binding sites also was higher in tree shrews than in rats (Bmax = 2499 versus 1495 pmol/g wet weight (ww)). [3H]raclopride revealed D2/3 receptors in the tree shrew striatum with about the same density as in rats (Bmax = 78.4 versus 84.1 pmol/g ww), but with slightly lower affinity in tree shrews (KD = 1.27 versus 0.59 nM). Conlusions The higher affinity in combination with the higher abundance of DAT binding sites compared to rat striatum predicts substantially higher binding of [123I]FP‐CIT in SPECT studies of living tree shrews. Synapse 69:497–504, 2015. © 2015 Wiley Periodicals, Inc. Using in vitro autoradiography, the authors characterize the binding of [123I]FP‐CIT to striatal dopamine transporters in tree shrew compared to rat. 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[123I]FP‐CIT is widely used in clinical SPECT imaging to reveal nigrostriatal degeneration in aid of the diagnosis of clinically uncertain parkinsonian syndromes. Despite its wide clinical use, the saturation binding parameters of [123I]FP‐CIT for the dopamine transporter (DAT) have not yet been determined in any mammalian brain. Tree shrews are genetically and neuroanatomically more similar to humans than are rodents and might therefore be a valuable animal model for research of neurological disorders involving brain dopamine. Experimental Design Quantitative in vitro autoradiography with [123I]FP‐CIT was performed with brains of healthy tree shrews and, for comparison, brains of healthy rats. Dopamine D2/3 receptor autoradiography with [3H]raclopride was also performed. Principal observations Saturation analysis revealed high specificity of [123I]FP‐CIT for DAT in the striatum with considerably higher affinity in tree shrews than in rats (KD = 10.3 versus 36.4 nM). The density of DAT binding sites also was higher in tree shrews than in rats (Bmax = 2499 versus 1495 pmol/g wet weight (ww)). [3H]raclopride revealed D2/3 receptors in the tree shrew striatum with about the same density as in rats (Bmax = 78.4 versus 84.1 pmol/g ww), but with slightly lower affinity in tree shrews (KD = 1.27 versus 0.59 nM). Conlusions The higher affinity in combination with the higher abundance of DAT binding sites compared to rat striatum predicts substantially higher binding of [123I]FP‐CIT in SPECT studies of living tree shrews. Synapse 69:497–504, 2015. © 2015 Wiley Periodicals, Inc. Using in vitro autoradiography, the authors characterize the binding of [123I]FP‐CIT to striatal dopamine transporters in tree shrew compared to rat. This is the first report of the dissociation constant of [123I]FP‐CIT for the dopamine transporter in mammalian brain.</description><subject>[123I]FP-CIT</subject><subject>Animals</subject><subject>Autoradiography</subject><subject>Corpus Striatum - diagnostic imaging</subject><subject>Corpus Striatum - metabolism</subject><subject>dissociation constant</subject><subject>Dopamine Antagonists - pharmacokinetics</subject><subject>Dopamine Plasma Membrane Transport Proteins - metabolism</subject><subject>dopamine receptor</subject><subject>dopamine transporter</subject><subject>Humans</subject><subject>In Vitro Techniques</subject><subject>Male</subject><subject>mammalian brain</subject><subject>Protein Binding - drug effects</subject><subject>raclopride</subject><subject>Raclopride - pharmacokinetics</subject><subject>Rats</subject><subject>Tomography, Emission-Computed, Single-Photon</subject><subject>tree shrew</subject><subject>Tropanes - pharmacokinetics</subject><subject>Tupaia</subject><subject>Tupaiidae</subject><issn>0887-4476</issn><issn>1098-2396</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqNkV9rFDEUxYModlt98AtIwJf6MG3-TSbzaBfbLixVbEVFJNyZyXRTdybTJNN2_Qx-aLO7bR8EwacL9_7OuRwOQq8oOaCEsMOw6g8YVVw9QRNKSpUxXsqnaEKUKjIhCrmDdkO4IoRwSsRztMMkZbIUbIJ-TxfgoY7G218Qreuxa_F3yvjsx_HHbDq7wJXtG9tf4uhwXBjcuAE62xscPfRhcD5Jse03txC9hTh2a4_oTVosvLkNuFrh6xH6aGN6cWPW-I2N3mEYo_PQWHfpYVisXqBnLSyDeXk_99Dn4_cX09Ns_uFkNn03z2pRipQOmJRtBaogXFKAmreSy6KSQtAmL6FuhQGiTFulixAmJ6RhtDQyb7k0Kud7aH_rO3h3PZoQdWdDbZZL6I0bg6YFZblkOSX_gZK8YKqURULf_IVeudH3KciG4iVj5Zp6u6Vq70LwptWDtx34laZEr9vUqU29aTOxr-8dx6ozzSP5UF8CDrfArV2a1b-d9Pm3swfLbKuwIZq7RwX4nzpFKHL95exEq_NPR-rr0Vyf8j-ZGLlZ</recordid><startdate>201510</startdate><enddate>201510</enddate><creator>Geisler, Stefanie</creator><creator>Beindorff, Nicola</creator><creator>Cremer, Markus</creator><creator>Hoffmann, Kerstin</creator><creator>Brenner, Winfried</creator><creator>Cumming, Paul</creator><creator>Meyer, Philipp T.</creator><creator>Langen, Karl-Josef</creator><creator>Fuchs, Eberhard</creator><creator>Buchert, Ralph</creator><general>Blackwell Publishing Ltd</general><general>Wiley Subscription Services, Inc</general><scope>BSCLL</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QP</scope><scope>7TK</scope><scope>K9.</scope><scope>7X8</scope></search><sort><creationdate>201510</creationdate><title>Characterization of [123I]FP-CIT binding to the dopamine transporter in the striatum of tree shrews by quantitative in vitro autoradiography</title><author>Geisler, Stefanie ; 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Calcified Tissue Abstracts</collection><collection>Neurosciences Abstracts</collection><collection>ProQuest Health &amp; Medical Complete (Alumni)</collection><collection>MEDLINE - Academic</collection><jtitle>Synapse (New York, N.Y.)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Geisler, Stefanie</au><au>Beindorff, Nicola</au><au>Cremer, Markus</au><au>Hoffmann, Kerstin</au><au>Brenner, Winfried</au><au>Cumming, Paul</au><au>Meyer, Philipp T.</au><au>Langen, Karl-Josef</au><au>Fuchs, Eberhard</au><au>Buchert, Ralph</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Characterization of [123I]FP-CIT binding to the dopamine transporter in the striatum of tree shrews by quantitative in vitro autoradiography</atitle><jtitle>Synapse (New York, N.Y.)</jtitle><addtitle>Synapse</addtitle><date>2015-10</date><risdate>2015</risdate><volume>69</volume><issue>10</issue><spage>497</spage><epage>504</epage><pages>497-504</pages><issn>0887-4476</issn><eissn>1098-2396</eissn><coden>SYNAET</coden><abstract>ABSTRACT Objectives Aim of this study was to quantify the binding of [123I]FP‐CIT in striatum of healthy tree shrews. [123I]FP‐CIT is widely used in clinical SPECT imaging to reveal nigrostriatal degeneration in aid of the diagnosis of clinically uncertain parkinsonian syndromes. Despite its wide clinical use, the saturation binding parameters of [123I]FP‐CIT for the dopamine transporter (DAT) have not yet been determined in any mammalian brain. Tree shrews are genetically and neuroanatomically more similar to humans than are rodents and might therefore be a valuable animal model for research of neurological disorders involving brain dopamine. Experimental Design Quantitative in vitro autoradiography with [123I]FP‐CIT was performed with brains of healthy tree shrews and, for comparison, brains of healthy rats. Dopamine D2/3 receptor autoradiography with [3H]raclopride was also performed. Principal observations Saturation analysis revealed high specificity of [123I]FP‐CIT for DAT in the striatum with considerably higher affinity in tree shrews than in rats (KD = 10.3 versus 36.4 nM). The density of DAT binding sites also was higher in tree shrews than in rats (Bmax = 2499 versus 1495 pmol/g wet weight (ww)). [3H]raclopride revealed D2/3 receptors in the tree shrew striatum with about the same density as in rats (Bmax = 78.4 versus 84.1 pmol/g ww), but with slightly lower affinity in tree shrews (KD = 1.27 versus 0.59 nM). Conlusions The higher affinity in combination with the higher abundance of DAT binding sites compared to rat striatum predicts substantially higher binding of [123I]FP‐CIT in SPECT studies of living tree shrews. Synapse 69:497–504, 2015. © 2015 Wiley Periodicals, Inc. Using in vitro autoradiography, the authors characterize the binding of [123I]FP‐CIT to striatal dopamine transporters in tree shrew compared to rat. This is the first report of the dissociation constant of [123I]FP‐CIT for the dopamine transporter in mammalian brain.</abstract><cop>United States</cop><pub>Blackwell Publishing Ltd</pub><pmid>26126942</pmid><doi>10.1002/syn.21838</doi><tpages>8</tpages></addata></record>
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subjects [123I]FP-CIT
Animals
Autoradiography
Corpus Striatum - diagnostic imaging
Corpus Striatum - metabolism
dissociation constant
Dopamine Antagonists - pharmacokinetics
Dopamine Plasma Membrane Transport Proteins - metabolism
dopamine receptor
dopamine transporter
Humans
In Vitro Techniques
Male
mammalian brain
Protein Binding - drug effects
raclopride
Raclopride - pharmacokinetics
Rats
Tomography, Emission-Computed, Single-Photon
tree shrew
Tropanes - pharmacokinetics
Tupaia
Tupaiidae
title Characterization of [123I]FP-CIT binding to the dopamine transporter in the striatum of tree shrews by quantitative in vitro autoradiography
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