Characterization of [[.sup.11]C]Lu AE92686 as a PET radioligand for phosphodiesterase 10A in the nonhuman primate brain
Journal Title: | European journal of nuclear medicine and molecular imaging 2017-02-01, Vol.44 (2), p.308 |
Main Author: | Yang, Kai-Chun |
Other Authors: | Stepanov, Vladimir , Amini, Nahid , Martinsson, Stefan , Takano, Akihiro , Nielsen, Jacob , Bundgaard, Christoffer , Bang-Andersen, Benny , Grimwood, Sarah , Halldin, Christer , Farde, Lars , Finnema, Sjoerd J |
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Publisher: | Springer |
ID: | ISSN: 1619-7070 |
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title: | Characterization of [[.sup.11]C]Lu AE92686 as a PET radioligand for phosphodiesterase 10A in the nonhuman primate brain |
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ispartof: | European journal of nuclear medicine and molecular imaging, 2017-02-01, Vol.44 (2), p.308 |
description: | Byline: Kai-Chun Yang (1), Vladimir Stepanov (1), Nahid Amini (1), Stefan Martinsson (1), Akihiro Takano (1), Jacob Nielsen (2), Christoffer Bundgaard (3), Benny Bang-Andersen (3), Sarah Grimwood (4), Christer Halldin (1), Lars Farde (1,5), Sjoerd J. Finnema (1,6) Keywords: [11C]Lu AE92686; Monkey; MP-10; Phosphodiesterase 10A; PET; Substantia nigra Purpose [11C]Lu AE92686 is a positron emission tomography (PET) radioligand that has recently been validated for examining phosphodiesterase 10A (PDE10A) in the human striatum. [[.sup.11]C]Lu AE92686 has high affinity for PDE10A (IC .sub.50=0.39 nM) and may also be suitable for examination of the substantia nigra, a region with low density of PDE10A. Here, we report characterization of regional [[.sup.11]C]Lu AE92686 binding to PDE10A in the nonhuman primate (NHP) brain. Methods A total of 11 PET measurements, seven baseline and four following pretreatment with unlabeled Lu AE92686 or the structurally unrelated PDE10A inhibitor MP-10, were performed in five NHPs using a high resolution research tomograph (HRRT). [[.sup.11]C]Lu AE92686 binding was quantified using a radiometabolite-corrected arterial input function and compartmental and graphical modeling approaches. Results Regional time-activity curves were best described with the two-tissue compartment model (2TCM). However, the distribution volume (V .sub.T) values for all regions were obtained by the Logan plot analysis, as reliable cerebellar V .sub.T values could not be derived by the 2TCM. For cerebellum, a proposed reference region, V .sub.T values increased by [proportional to]30 % with increasing PET measurement duration from 63 to 123 min, while V .sub.T values in target regions remained stable. Both pretreatment drugs significantly decreased [[.sup.11]C]Lu AE92686 binding in target regions, while no significant effect on cerebellum was observed. Binding potential (BP .sub.ND) values, derived with the simplified reference tissue model (SRTM), were 13--17 in putamen and 3--5 in substantia nigra and correlated well to values from the Logan plot analysis. Conclusions The method proposed for quantification of [[.sup.11]C]Lu AE92686 binding in applied studies in NHP is based on 63 min PET data and SRTM with cerebellum as a reference region. The study supports that [[.sup.11]C]Lu AE92686 can be used for PET examinations of PDE10A binding also in substantia nigra. Author Affiliation: (1) Department of Clinical Neuroscience, Center for Psychiatric Research, |
language: | eng |
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identifier: | ISSN: 1619-7070 |
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