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Blocking of efflux transporters in rats improves translational validation of brain radioligands
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- Shalgunov, Vladimir (författare)
- Univ Copenhagen, Fac Hlth & Med Sci, Dept Drug Design & Pharmacol, Jagtvej 160, DK-2100 Copenhagen, Denmark.;Copenhagen Univ Hosp, Rigshosp, Dept Clin Physiol Nucl Med & PET, Blegdamsvej 9, DK-2100 Copenhagen, Denmark.
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- Xiong, Mengfei (författare)
- Uppsala universitet,Geriatrik,Univ Copenhagen, Fac Hlth & Med Sci, Dept Drug Design & Pharmacol, Jagtvej 160, DK-2100 Copenhagen, Denmark.;Rigshosp, Neurobiol Res Unit, Blegdamsvej 9, DK-2100 Copenhagen, Denmark.
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- L'Estrade, Elina T. (författare)
- Univ Copenhagen, Fac Hlth & Med Sci, Dept Drug Design & Pharmacol, Jagtvej 160, DK-2100 Copenhagen, Denmark.;Skanes Univ Hosp, Nucl Med Phys Unit, Radiat Phys, Barngatan 3, S-22242 Lund, Sweden.
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- Univ Copenhagen, Fac Hlth & Med Sci, Dept Drug Design & Pharmacol, Jagtvej 160, DK-2100 Copenhagen, Denmark;Copenhagen Univ Hosp, Rigshosp, Dept Clin Physiol Nucl Med & PET, Blegdamsvej 9, DK-2100 Copenhagen, Denmark. Geriatrik (creator_code:org_t)
- 2020-10-19
- 2020
- Engelska.
- Ingår i: EJNMMI Research. - : SPRINGER. - 2191-219X. ; 10:1
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
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- Background Positron emission tomography (PET) is a molecular imaging technique that can be used to investigate the in vivo pharmacology of drugs. Initial preclinical evaluation of PET tracers is often conducted in rodents due to the accessibility of disease models as well as economic considerations. Compared to larger species, rodents display a higher expression and/or activity of efflux transporters such as the P-glycoprotein (P-gp). Low brain uptake could, therefore, be species-specific and uptake in rodents not be predictive for that in humans. We hypothesized that a better prediction from rodent data could be achieved when a tracer is evaluated under P-gp inhibition. Consequently, we compared the performance of eight neuroreceptor tracers in rats with and without P-gp inhibition including a specific binding blockade. This data set was then used to predict the binding of these eight tracers in pigs. Methods PET tracers targeting serotonin 5-HT(2A)receptors ([F-18]MH.MZ, [F-18]Altanserin, [C-11]Cimbi-36, [C-11]Pimavanserin), serotonin 5-HT(7)receptors ([C-11]Cimbi-701, [C-11]Cimbi-717 and [C-11]BA-10) and dopamine D(2/3)receptors ([F-18]Fallypride) were used in the study. The brain uptake and target-specific binding of these PET radiotracers were evaluated in rats with and without inhibition of P-gp. Rat data were subsequently compared to the results obtained in pigs. Results Without P-gp inhibition, the amount of target-specific binding in the rat brain was sufficient to justify further translation for three out of eight evaluated tracers. With P-gp inhibition, results for five out of eight tracers justified further translation. The performance in pigs could correctly be predicted for six out of eight tracers when rat data obtained under P-gp inhibition were used, compared to four out of eight tracers without P-gp inhibition. Conclusions P-gp strongly affects the uptake of PET tracers in rodents, but false prediction outcomes can be reduced by evaluating a tracer under P-gp inhibition.
Ämnesord
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinska och farmaceutiska grundvetenskaper -- Neurovetenskaper (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Basic Medicine -- Neurosciences (hsv//eng)
Nyckelord
- P-gp
- Efflux transporter
- PET
- Rodents
- Pigs
- Rats
- Translation
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