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In vivo evaluation of limiting brain penetration of probes for ?(2C)-adrenoceptor using small-animal positron emission tomography.


ABSTRACT: To evaluate in vivo brain penetration of ?(2C)-adrenoceptor (?(2C)-AR) antagonists as a therapeutic agent, we synthesized two new (11)C-labeled selective ?(2C)-AR antagonists 4-(6,7-dimethoxy-1,2,3,4-tetrahydroisoquinolin-2-yl)methyl-2-aryl-7-methoxybenzofuran ([(11)C]MBF) and acridin-9-yl-[4-(4-methylpiperazin-1-yl)phenyl]amine ([(11)C]JP-1302) as ?(2C)-AR-selective positron emission tomography (PET) probes. The radiochemical yield, specific activity, and radiochemical purity of these probes was appropriate for injection. To evaluate whether the brain penetration of these probes is related to the function of two major drug efflux transporters, P-glycoprotein (P-gp) and breast cancer resistance protein (BCRP), we performed PET studies using wild-type and P-gp/Bcrp knockout mice. In wild-type mice, the radioactivity level after injection with [(11)C]MBF initially increased and effluxed immediately from the brain, whereas that with [(11)C]JP-1302 was distributed throughout the brain. However, the regional distribution of radioactivity after injection with [(11)C]JP-1302 in the brain was different from that of ?(2C)-ARs. In P-gp/Bcrp knockout mice, uptake of [(11)C]MBF was approximately 3.7-fold higher and that of [(11)C]JP-1302 was approximately 1.6-fold higher than those in wild-type mice. These results indicate that brain penetration of the two PET probes was affected by modulation of P-gp and Bcrp functions.

SUBMITTER: Kawamura K 

PROVIDER: S-EPMC3368684 | biostudies-literature | 2010 Jul

REPOSITORIES: biostudies-literature

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In vivo evaluation of limiting brain penetration of probes for α(2C)-adrenoceptor using small-animal positron emission tomography.

Kawamura Kazunori K   Akiyama Megumi M   Yui Joji J   Yamasaki Tomoteru T   Hatori Akiko A   Kumata Katsushi K   Wakizaka Hidekatsu H   Takei Makoto M   Nengaki Nobuki N   Yanamoto Kazuhiko K   Fukumura Toshimitsu T   Zhang Ming-Rong MR  

ACS chemical neuroscience 20100602 7


To evaluate in vivo brain penetration of α(2C)-adrenoceptor (α(2C)-AR) antagonists as a therapeutic agent, we synthesized two new (11)C-labeled selective α(2C)-AR antagonists 4-(6,7-dimethoxy-1,2,3,4-tetrahydroisoquinolin-2-yl)methyl-2-aryl-7-methoxybenzofuran ([(11)C]MBF) and acridin-9-yl-[4-(4-methylpiperazin-1-yl)phenyl]amine ([(11)C]JP-1302) as α(2C)-AR-selective positron emission tomography (PET) probes. The radiochemical yield, specific activity, and radiochemical purity of these probes wa  ...[more]

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