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2012 ; 3
(11
): 936-41
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Evaluation of (11)C N-Methyl Lansoprazole as a Radiopharmaceutical for PET
Imaging of Tau Neurofibrillary Tangles
#MMPMID24900410
Shao X
; Carpenter GM
; Desmond TJ
; Sherman P
; Quesada CA
; Fawaz M
; Brooks AF
; Kilbourn MR
; Albin RL
; Frey KA
; Scott PJ
ACS Med Chem Lett
2012[Nov]; 3
(11
): 936-41
PMID24900410
show ga
[(11)C]N-Methyl lansoprazole ([(11)C]NML, 3) was synthesized and evaluated as a
radiopharmaceutical for quantifying tau neurofibrillary tangle (NFT) burden using
positron emission tomography (PET) imaging. [(11)C]NML was synthesized from
commercially available lansoprazole in 4.6% radiochemical yield (noncorrected
RCY, based upon [(11)C]MeI), 99% radiochemical purity, and 16095 Ci/mmol specific
activity (n = 5). Log P was determined to be 2.18. A lack of brain uptake in
rodent microPET imaging revealed [(11)C]NML to be a substrate for the rodent
permeability-glycoprotein 1 (PGP) transporter, but this could be overcome by
pretreating with cyclosporin A to block the PGP. Contrastingly, [(11)C]NML was
not found to be a substrate for the primate PGP, and microPET imaging in rhesus
revealed [(11)C]NML uptake in the healthy primate brain of ?1600 nCi/cc maximum
at 3 min followed by rapid egress to 500 nCi/cc. Comparative autoradiography
between wild-type rats and transgenic rats expressing human tau (hTau +/+)
revealed 12% higher uptake of [(11)C]NML in the cortex of brains expressing human
tau. Further autoradiography with tau positive brain samples from progressive
supranuclear palsy (PSP) patients revealed colocalization of [(11)C]NML with tau
NFTs identified using modified Bielschowsky staining. Finally, saturation binding
experiments with heparin-induced tau confirmed K d and Bmax values of [(11)C]NML
as 700 pM and 0.214 fmol/?g, respectively.