Strategies for PET imaging of the receptor for advanced glycation endproducts(RAGE)  

作　　者：Lindsey R.Drake Allen F.Brooks Jenelle Stauff Phillip S.Sherman Janna Arteaga Robert A.Koeppe Aimee Reed Timothy J.Montavon Marc B.Skaddan Peter J.H.Scott 

机构地区：[1]Department of Radiology,University of Michigan,Ann Arbor,MI,48109,USA [2]Department of Medicinal Chemistry,University of Michigan,Ann Arbor,MI,48109,USA [3]AbbVie Process Chemistry,North Chicago,IL,60064,USA [4]AbbVie Centralized Medicinal Chemistry,North Chicago,IL,60064,USA [5]AbbVie Translational Imaging,North Chicago,IL,60064,USA

出　　处：《Journal of Pharmaceutical Analysis》2020年第5期452-465,共14页药物分析学报（英文版）

基　　金：Financial support from the National Institutes of Health Pharmaceutical Sciences Training Program(T32-GM007767);the Rackham Graduate School at the University of Michigan is gratefully acknowledged.We also thank Brian Cary,Maria Fawaz,Timothy Desmond and Carole Quesada for their contributions to early in vitro and in vivo experiments conducted with[18F]RAGER.

摘　　要：The implication of the receptor for advanced glycation end-products(RAGE)in numerous diseases and neurodegenerative disorders makes it interesting both as a therapeutic target and as an inflammatory biomarker.In the context of investigating RAGE as a biomarker,there is interest in developing radiotracers that will enable quantification of RAGE using positron emission tomography(PET)imaging.We have synthesized potential small molecule radiotracers for both the intracellular([18F]InRAGER)and extracellular([18F]RAGER)domains of RAGE.Herein we report preclinical evaluation of both using in vitro(lead panel screens)and in vivo(rodent and nonhuman primate PET imaging)methods.Both radiotracers have high affinity for RAGE and show good brain uptake,but suffer from off-target binding.The source of the off-target PET signal is not attributable to binding to melatonin receptors,but remains unexplained.We have also investigated use of lipopolysaccharide(LPS)-treated mice as a possible animal model with upregulated RAGE for evaluation of new imaging agents.Immunoreactivity of the mouse brain sections revealed increases in RAGE in the male cohorts,but no difference in the female groups.However,it proves challenging to quantify the changes in RAGE due to off-target binding of the radiotracers.Nevertheless,they are appropriate lead scaffolds for future development of 2nd generation RAGE PET radiotracers because of their high affinity for the receptor and good CNS penetration.

关 键 词：RAGE NEUROIMAGING Positron emission tomography RADIOCHEMISTRY NEUROINFLAMMATION 

分 类 号：R817.9[医药卫生—影像医学与核医学]