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[18F]GE-180 PET Detects Reduced Microglia Activation After LM11A-31 Therapy in a Mouse Model of Alzheimer's Disease.


ABSTRACT: Microglial activation is a key pathological feature of Alzheimer's disease (AD). PET imaging of translocator protein 18 kDa (TSPO) is a strategy to detect microglial activation in vivo. Here we assessed flutriciclamide ([18F]GE-180), a new second-generation TSPO-PET radiotracer, for its ability to monitor response to LM11A-31, a novel AD therapeutic in clinical trials. AD mice displaying pathology were treated orally with LM11A-31 for 3 months. Subsequent [18F]GE-180-PET imaging revealed significantly lower signal in cortex and hippocampus of LM11A-31-treated AD mice compared to those treated with vehicle, corresponding with decreased levels of TSPO immunostaining and microglial Iba1 immunostaining. In addition to detecting decreased microglial activation following LM11A-31 treatment, [18F]GE-180 identified activated microglia in AD mice with greater sensitivity than another second-generation TSPO radiotracer, [18F]PBR06. Together, these data demonstrate the promise of [18F]GE-180 as a potentially sensitive tool for tracking neuroinflammation in AD mice and for monitoring therapeutic modulation of microglial activation.

SUBMITTER: James ML 

PROVIDER: S-EPMC5436503 | biostudies-other | 2017

REPOSITORIES: biostudies-other

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[<sup>18</sup>F]GE-180 PET Detects Reduced Microglia Activation After LM11A-31 Therapy in a Mouse Model of Alzheimer's Disease.

James Michelle L ML   Belichenko Nadia P NP   Shuhendler Adam J AJ   Hoehne Aileen A   Andrews Lauren E LE   Condon Christina C   Nguyen Thuy-Vi V TV   Reiser Vladimer V   Jones Paul P   Trigg William W   Rao Jianghong J   Gambhir Sanjiv S SS   Longo Frank M FM  

Theranostics 20170324 6


Microglial activation is a key pathological feature of Alzheimer's disease (AD). PET imaging of translocator protein 18 kDa (TSPO) is a strategy to detect microglial activation <i>in vivo</i>. Here we assessed flutriciclamide ([<sup>18</sup>F]GE-180), a new second-generation TSPO-PET radiotracer, for its ability to monitor response to LM11A-31, a novel AD therapeutic in clinical trials. AD mice displaying pathology were treated orally with LM11A-31 for 3 months. Subsequent [<sup>18</sup>F]GE-180  ...[more]

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