PET Imaging of the Translocator Proteine Ligands (TSPO) With [18 F] DPA-714 Biomarker of NeuroInflammation in Cognitive Decline (NIDECO)

• Status: Unknown status
• Trial end date: 2018-01-01
• Target enrollment: 0
• Participant gender: All

Summary

Alzheimer's disease (AD) is the most common cause of dementia in elderly subjects. AD is characterized by brain lesions like extracellular deposits of ß-amyloïd proteins in senile plaques and intracellular neurofibrillary tangles of hyper-phosphorylated tau protein, both of which are associated with the loss of neurons. The development of disease biomarkers for AD (Tau, PhTau and βamyloid dosing in the cerebrospinal fluid, brain MRI, amyloid PET imaging and fluorodeoxyglucose PET imaging) to identify the pathophysiological processes underlying cognitive impairment biomarkers, have been incorporated into revised diagnosis guidelines.

Post-mortem human AD and AD animal model studies have reported inflammatory processes also implicated in the neuropathology of AD, and upregulated levels of pro-inflammatory cytokines.

In vivo visualization of microglial activation has become possible with the development of molecular imaging ligands (tracers) for use with positron emission tomography (PET). The translocator protein (TSPO) formerly known as the peripheral benzodiazepine receptor (PBR), a receptor located in the outer membrane of mitochondria, is upregulated during neuroinflammation. So targeting TSPO with radiolabeled ligands for PET is considered as an attractive biomarker for neuroinflammation.

The main aim of this pilot study is to quantify neuroinflammation, in terms of fixation and distribution of [18F] DPA-714(Binding Potential BP), and to study its relationship with amyloid load, measured with in [18F]AV-45 (Standard Uptake Values ratio) in cognitive decline.

• Phase: Phase 1
• Accepts Healthy Volunteers?: No

Details

• Lead Sponsor: University Hospital, Tours

Criteria

Inclusion Criteria:

Criteria common to all participants:

• Signed informed consent

• Age ≥ 60 years old (60-80 years old)

• Native language: French

• Correct sensory abilities (hearing aids accepted) to perform the tests

• Affiliated to a social security system

Criteria for patients with mild to moderate Alzheimer disease defined according to the NINCDS-ADRDA {McKhann, 2011 # 408}:

• MMS between 20 and 25

Criteria for amnestic MCI patients:

• Amnestic mildcognitive disorder evoking a MA in pre stage dementia {Dubois, 2010 # 273, Dubois, 2007 # 42; Pertersen, 1999 # 21, Albert, 2011 # 409} older than 60 years.

Criteria for patients with isolated memory Complaint (Without Cognitive Decline):

• MMS score ≥ 26

• Normal performance by age and educational level