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Updated: Aug 20, 2026
In Vivo Dynamics of Retinal Microglial Activation During Neurodegeneration: Confocal Ophthalmoscopic Imaging and Cell Morphometry in Mouse Glaucoma
Published on: May 11, 2015
In vivo detection of microglial activation in frontotemporal dementia
Annachiara Cagnin1, Martin Rossor, Elizabeth L Sampson
1MRC Cyclotron Unit, MRC Clinical Sciences Centre, Imperial College London, Hammersmith Hospital Campus, London, United Kingdom.
Abstract:
Using positron emission tomography and [(11)C](R)-PK11195, a marker of "peripheral benzodiazepine sites" that is upregulated on activated microglia during progressive tissue pathology, we show increased binding of [(11)C](R)-PK11195 in frontotemporal lobar degeneration in the typically affected frontotemporal brain regions. This implies the presence of an active glial response reflecting progressive neuronal degeneration. It also suggests that increased [(11)C](R)-PK11195 binding, previously demonstrated for Alzheimer's disease, may occur independently from increased amyloid plaque formation, given that it is not a characteristic feature of frontotemporal lobar degeneration.
Insights
Positron emission tomography revealed increased [(11)C](R)-PK11195 binding in frontotemporal lobar degeneration, indicating active glial responses in affected brain regions. This suggests microglial activation in neurodegeneration may be independent of amyloid plaques.
Area of Science:
- Neuroimaging
- Neuroinflammation
- Neuropathology
Background:
- Peripheral benzodiazepine sites are upregulated on activated microglia during neurodegeneration.
- Frontotemporal lobar degeneration (FTLD) is a progressive neurodegenerative disease affecting frontotemporal regions.
- Alzheimer's disease (AD) shows increased [(11)C](R)-PK11195 binding, associated with amyloid plaques.
Purpose of the Study:
- To investigate microglial activation in FTLD using [(11)C](R)-PK11195 positron emission tomography (PET).
- To determine if increased [(11)C](R)-PK11195 binding in FTLD is linked to amyloid plaque formation.
Main Methods:
- Positron emission tomography (PET) imaging was performed.
- [(11)C](R)-PK11195, a tracer for peripheral benzodiazepine sites, was used.
- Binding patterns were analyzed in frontotemporal brain regions of FTLD patients.
Main Results:
- Increased binding of [(11)C](R)-PK11195 was observed in the frontotemporal regions typically affected by FTLD.
- This finding suggests an active glial response, indicative of progressive neuronal degeneration.
- The results imply that microglial activation in neurodegenerative diseases like FTLD can occur independently of amyloid pathology.
Conclusions:
- [(11)C](R)-PK11195 PET imaging demonstrates glial activation in FTLD.
- Microglial activation in neurodegeneration is not solely dependent on amyloid plaque formation.
- This study highlights the potential of [(11)C](R)-PK11195 as a marker for neuroinflammation in various neurodegenerative conditions.
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