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MECHANISMS OF NEURONAL RESILIENCE IN ALZHEIMER'S DISEASE AND ITS FOCAL VARIANTS: A PET/MR STUDY

NCT04150198 · Status: RECRUITING · Phase: NA · Type: INTERVENTIONAL · Enrollment: 45

Last updated 2024-07-30

No results posted yet for this study

Summary

Patients with Alzheimer's disease and with early onset of symptoms (\<65 years) (AD-Y) have a multi-domain cognitive deficit, whereas memory disorders (typical of the elderly patient's AD) are less often in the foreground. In addition, some MA-J have an atypical phenotype indicating focal brain damage, although they have the same pathological lesions: amyloid deposits and tau protein deposition (DNF). This is the case of posterior cortical atrophy (PCA) characterized by complex visual disturbances and atrophy affecting the more posterior regions of the brain. Based on the clinical profile of PCA patients, a more refined anatomo-clinical classification was proposed, distinguishing a rather "ventral" form and a rather "dorsal" form. The recent arrival of tau-specific PET tracers now makes it possible to evaluate in vivo fibrillary neurodegeneration (FND), which is well correlated with the severity of cognitive disorders. Advances in MRI have shown that each neurodegenerative syndrome targets a large-scale neural network, which in turn shows a vulnerability for a specific biological disease. In the case of AD, the reason for such a difference in cognitive and anatomical impairment between patients with diffuse involvement and others with more focal involvement is not known. One possible explanation is the existence, in focal forms, of neuronal mechanisms that oppose vulnerability. These mechanisms may correspond to the so-called "resilience" phenomenon, defined as resistance to a neuropathological process by the ability to optimize cognitive performance via the efficient recruitment of neural networks. The mechanisms underlying resilience in neurodegeneration are unknown. Their identification is very important for the management and treatment of AD.

Conditions

  • Alzheimer Disease, Early Onset
  • Posterior Cortical Atrophy

Interventions

DEVICE

TEP/IRM

All participants will have a PET / MRI examination including: i) a 30-minute PET scan, 80 minutes after intravenous injection of 240 MBq of 18F-AV1451 ± 10% ii) a ZTE sequence (for attenuation correction of PET images), a 3D T1 anatomical sequence, a diffusion MRI, a functional MRI at rest (total duration: 45 minutes). These acquisitions will be made during the same exam session on a hybrid PET / MRI camera allowing simultaneous acquisitions. This visit lasts about 3 hours.

Sponsors & Collaborators

  • France Alzheimer

    collaborator OTHER

  • Institut National de la Santé Et de la Recherche Médicale, France

    lead OTHER_GOV

Study Design

Allocation
NON_RANDOMIZED
Purpose
DIAGNOSTIC
Masking
NONE
Model
PARALLEL

Eligibility

Min Age
40 Years
Max Age
80 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2021-12-08
Primary Completion
2025-12-31
Completion
2026-12-31

Countries

  • France

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT04150198 on ClinicalTrials.gov