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Background  We have explored the possibility that the serotonin 1B receptor radioligand [ 11 C]AZ10419369 is a substrate for adenosine triphosphate (ATP)-binding cassette (ABC) transporters, such as P-glycoprotein (P-gp), Mrp4, and Bcrp, in rodents and whether there is a species difference regarding its blood-brain barrier (BBB) penetration.    Methods  In a series of preclinical positron emission tomography measurements, we have administered [ 11 C]AZ10419369 to mice, rats, and guinea pigs under baseline conditions and, on separate experimental days, after administration of the ABC transporter inhibitor, cyclosporin A (CsA).    Results  During baseline conditions, the brain uptake was low in mice and rats, but not in guinea pigs. After CsA pretreatment, the peak whole brain uptake values of [ 11 C]AZ10419369 increased by 207% in mice, 94% in rats, and 157% in guinea pigs. Binding potentials (BP ND ) could not be estimated during baseline conditions in mice and rats. After CsA pretreatment, the highest BP ND  values were obtained in the striatum and thalamus (BP ND  ≈ 0.4) in mice, while in rats, the highest binding areas were the striatum, thalamus, hypothalamus, and periaqueductal gray (BP ND  ≈ 0.5). In guinea pigs, we did not find any significant changes in BP ND  between baseline and CsA pretreatment, except in the striatum.    Conclusions  The results indicate that BBB penetration of [ 11 C]AZ10419369 was hindered by ABC transporter activity in mouse, rat, and guinea pig. This study highlights the importance of ABC transporters in the design of preclinical positron emission tomography (PET) studies.    Electronic supplementary material  The online version of this article (doi:10.1186/s13550-014-0064-0) contains supplementary material, which is available to authorized users.

ABC transporter-dependent brain uptake of the 5-HT1B receptor radioligand [11C]AZ10419369: a comparative PET study in mouse, rat, and guinea pig