Development of a PET radioligand for potassium channels to image CNS demyelination

Pedro Brugarolas*, Jorge E. Sánchez-Rodríguez, Hsiu Ming Tsai, Falguni Basuli, Shih Hsun Cheng, Xiang Zhang, Andrew V. Caprariello, Jerome J. Lacroix, Richard Freifelder, Dhanabalan Murali, Onofre DeJesus, Robert H. Miller, Rolf E. Swenson, Chin Tu Chen, Peter Herscovitch, Daniel S. Reich, Francisco Bezanilla, Brian Popko

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


Central nervous system (CNS) demyelination represents the pathological hallmark of multiple sclerosis (MS) and contributes to other neurological conditions. Quantitative and specific imaging of demyelination would thus provide critical clinical insight. Here, we investigated the possibility of targeting axonal potassium channels to image demyelination by positron emission tomography (PET). These channels, which normally reside beneath the myelin sheath, become exposed upon demyelination and are the target of the MS drug, 4-aminopyridine (4-AP). We demonstrate using autoradiography that 4-AP has higher binding in non-myelinated and demyelinated versus well-myelinated CNS regions, and describe a fluorine-containing derivative, 3-F-4-AP, that has similar pharmacological properties and can be labeled with 18F for PET imaging. Additionally, we demonstrate that [18F]3-F-4-AP can be used to detect demyelination in rodents by PET. Further evaluation in Rhesus macaques shows higher binding in non-myelinated versus myelinated areas and excellent properties for brain imaging. Together, these data indicate that [18F]3-F-4-AP may be a valuable PET tracer for detecting CNS demyelination noninvasively.

Original languageEnglish (US)
Article number607
JournalScientific reports
Issue number1
StatePublished - Dec 1 2018

ASJC Scopus subject areas

  • General


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