Article (Scientific journals)
Cyclosporine, a P-glycoprotein modulator, increases [18F]MPPF uptake in rat brain and peripheral tissues: microPET and ex vivo studies.
Lacan, Goran; Plenevaux, Alain; Rubins, Daniel J. et al.
2008In European Journal of Nuclear Medicine and Molecular Imaging, 35 (12), p. 2256-66
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Keywords :
5-HT1A receptor; positron emission tomography; hippocampus; pharmacokinetics; blood brain barrier
Abstract :
[en] PURPOSE: Pretreatment with cyclosporine, a P-glycoprotein (P-gp) modulator increases brain uptake of 4-(2'-methoxyphenyl)-1-[2'-(N-2"-pyridinyl)-p-[(18)F]fluorobenzamido]ethylpiperaz ine ([(18)F]MPPF) for binding to hydroxytryptamine(1A) (5-HT(1A)) receptors. Those increases were quantified in rat brain with in vivo microPET and ex vivo tissue studies. MATERIALS AND METHODS: Each Sprague-Dawley rat (n = 4) received a baseline [(18)F]MPPF microPET scan followed by second scan 2-3 weeks later that included cyclosporine pretreatment (50 mg/kg, i.p.). Maximum a posteriori reconstructed images and volumetric ROIs were used to generate dynamic radioactivity concentration measurements for hippocampus, striatum, and cerebellum, with simplified reference tissue method (SRTM) analysis. Western blots were used to semiquantify P-gp regional distribution in brain. RESULTS: MicroPET studies showed that hippocampus uptake of [(18)F]MPPF was increased after cyclosporine; ex vivo studies showed similar increases in hippocampus and frontal cortex at 30 min, and for heart and kidney at 2.5 and 5 min, without concomitant increases in [(18)F]MPPF plasma concentration. P-gp content in cerebellum was twofold higher than in hippocampus or frontal cortex. CONCLUSIONS: These studies confirm and extend prior ex vivo results (J. Passchier, et al., Eur J Pharmacol, 2000) that showed [(18)F]MPPF as a substrate for P-gp. Our microPET results showed that P-gp modulation of [(18)F]MPPF binding to 5-HT(1A) receptors can be imaged in rat hippocampus. The heterogeneous brain distribution of P-gp appeared to invalidate the use of cerebellum as a nonspecific reference region for SRTM modeling. Regional quantitation of P-gp may be necessary for accurate PET assessment of 5-HT(1A) receptor density when based on tracer uptake sensitive to P-gp modulation.
Research center :
GIGA CRC (Cyclotron Research Center) In vivo Imaging-Aging & Memory - ULiège
Molecular and medical pharmacology UCLA
Disciplines :
Radiology, nuclear medicine & imaging
Author, co-author :
Lacan, Goran
Plenevaux, Alain  ;  Université de Liège - ULiège > Centre de recherches du cyclotron
Rubins, Daniel J.
Way, Baldwin M.
Defraiteur, Caroline
Lemaire, Christian ;  Université de Liège - ULiège > Centre de recherches du cyclotron
Aerts, Joël ;  Université de Liège - ULiège > Centre de recherches du cyclotron
Luxen, André ;  Université de Liège - ULiège > Département de chimie (sciences) > Chimie organique de synthèse - Centre de recherches du cyclotron
Cherry, Simon R.
Melega, William P.;  University of California, Los Angeles - UCLA > Molecular and medical pharmacology
Language :
English
Title :
Cyclosporine, a P-glycoprotein modulator, increases [18F]MPPF uptake in rat brain and peripheral tissues: microPET and ex vivo studies.
Publication date :
2008
Journal title :
European Journal of Nuclear Medicine and Molecular Imaging
ISSN :
1619-7070
eISSN :
1619-7089
Publisher :
Springer Science & Business Media B.V., New York, United States - New York
Volume :
35
Issue :
12
Pages :
2256-66
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
UCLA - University of California, Los Angeles
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