Clinical trial NCT06099587: MIMA Pilot Study: MIcrostructure of the Medial Temporal Lobe in Early Alzheimer's Disease
Official title: MIMA Pilot Study: MIcrostructure of the Medial Temporal Lobe in Early Alzheimer's Disease
Study type: INTERVENTIONAL
Overall status: RECRUITING
Phase: NA
Conditions: Alzheimer Disease, Early Onset
Keywords: Alzheimer disease
Mild Cognitive Impairment
Subjective cognitive decline-plus
Diffusion MRI
Microstructure
Memory
Lead sponsor: Rennes University Hospital
Sponsor class: OTHER
First posted: 2023-10-25
Enrollment: 50
Sex: ALL
Minimum age (years): 50
Maximum age (years): 80
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: NON_RANDOMIZED
Intervention model: PARALLEL
Intervention model description: Prospective single-center
Primary purpose: DIAGNOSTIC

Brief summary: Patients with Mild Cognitive Impairment (MCI) or Subjective Cognitive Decline (SCD) may or may not develop Alzheimer's disease (AD) dementia. Yet identifying patients at risk is crucial: delaying the onset of the disease by 5 years could reduce prevalence by 50%. To achieve this, we need affordable biomarkers combined with clinically meaningful assessment tools. Current approaches (cognition, imaging or Tau and Amyloid peptide assays) lack precision or specificity (e.g., age-related memory deficits) and involve invasive and costly procedures, sometimes inaccessible in France (e.g., the "AT(N)" framework). Recently, quantitative diffusion MRI (dMRI) has identified in-vivo gray matter microstructural changes linked to hyperphosphorylated Tau protein, which are of great diagnostic value. Still, we ignore whether and how these changes are responsible for early memory impairment in AD. The MIMA-P project will combine multi-compartment models of the high-resolution diffusion signal with a cognitive assessment of memory based on recent models of medial temporal lobe function to assess the relevance of a new affordable, rapid and non-invasive early marker of the disease.

Detailed description: The study will combine multi-compartment models (e.g. Archer et al., 2020; Parker et al., 2020) of high-resolution diffusion MRI within medial temporal lobes regions of interest defined through the ASHS algorithm (Yushkevich et al., 2015), with theoretically driven cognitive assessment medial temporal lobes functions. The '4 mountains test' and the 'Memory entities' test will allow specific probing of hippocampal and rhinal cortices functions, respectively (Hartley et al., 2007; Besson et al., 2020).

25 patients with 'subjective cognitive decline-plus' (hereafter 'SCD', criteria of Jessen et al., 2014) and 25 patients with mild neurocognitive impairment due to Alzheimer's disease (hereafter 'MCI', criteria of Albert et al., 2011) matched for gender, socio-professional category and level of education. The 25 healthy volunteers required have already been included in a different study.

Eligibility criteria: Inclusion Criteria:

* aged between 50 and 80
* native French speaking
* right-handed
* with a level of education equal to or higher than the Certificat d'Etudes Primaires (primary school leaving certificate)
* free of any medical or psychiatric condition likely to interfere with cognition, other than a diagnosis of SCD / MCI
* affiliated with a social security scheme
* having received oral and written information abou the protocol and having signed a consent form to participate in this research
* patients with 'subjective cognitive decline-plus' (hereafter 'SCD', criteria of Jessen et al., 2014) or patients with mild neurocognitive impairment due to Alzheimer's disease (hereafter 'MCI', criteria of Albert et al., 2011)

Exclusion Criteria:

* contraindications to MRI : Abdominal circumference + upper limbs stuck to the body \> 200 cm; Implantable pacemaker or defibrillator; Neurosurgical clips; Cochlear implants ; Neural or peripheral stimulator; Intra-orbital or encephalic metallic foreign bodies; Endoprostheses fitted less than 4 weeks ago and osteosynthesis devices fitted less than 6 weeks ago; Claustrophobia.
* sensory deficit interfering with experimental tests
* pregnant or breast-feeding women
* adults under legal protection (safeguard of justice, curatorship, guardianship), persons deprived of liberty
* 7-items modified Hachinski ischemic score \>2 (Hachinski et al., 2012)
* Dementia (McKhann et al., 2011)

Primary outcomes:
measure: Diffusion-MRI based parameters estimates of medial temporal lobe gray matter microstructure
timeFrame: 2 hours and 30 minutes
Secondary outcomes:
measure: Diffusion-MRI based parameters estimates of medial temporal lobe gray matter microstructure
timeFrame: 2 hours and 30 minutes
measure: Relationships between medial temporal lobe gray matter microstructure and memory
timeFrame: 2 hours and 30 minutes
Other outcomes:
Locations:
city: Rennes
country: France
facility: CHU Rennes
Study officials:
affiliation: CHU Rennes
name: Pierre-Yves JONIN, PhD
role: PRINCIPAL_INVESTIGATOR
References: