Alzheimer Disease, Memory Complaint, Mild Cognitive Impairment
Conditions
Brief 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.
Detailed description
Molecular imaging of microglial activation could help us document the central inflammatory status of study subjects and assist us in designing future research studies particularly with respect to which subjects to enrol into clinical trials and to evaluate the benefit of specific therapies in selected groups, for example, by monitoring the effects of Aß immunization.
Interventions
DRUG[18F]DPA-714 PET/ [18F]AV-45 PET/neuropsychological assessment
Sponsors
University Hospital, Tours
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
DIAGNOSTIC
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
60 Years to 80 Years
Healthy volunteers
No
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 * contraindication for MRI 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 No inclusion criteria : * medical history of evolutive disease with conséquences on NCS, chronic alcohol intake, severe depression with MADRS stage \> 18 * MA subjects : antagonistic treatment with N-methyl-D-aspartate * MA or MCI subjects : anomaly on neurologic clinical examination different of the usual symptomatology
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Fixation and distribution of [18F]DPA-714 (Binding Potential BP) | 2 years |
| [18F]AV-45 Standard Uptake Values ratio | 2 years |
Secondary
| Measure | Time frame |
|---|---|
| Relationship between [18F]DPA-714 uptake and cognitive, affective symptoms at baseline. | 2 years |
Countries
France
Outcome results
None listed