Amyloid Plaque and Tangle Imaging in Alzheimer's Disease and Down Syndrome

Study Overview
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Brief Summary
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The purpose of this study is to develop small molecule radio-labeled probes of beta-amyloid, to be used with positron emission tomography (PET) for early detection and treatment monitoring of Alzheimer disease (AD). The study hypothesis is that PET imaging of small molecule probes, in the form of novel fluorescent dyes with radioactive labels, will demonstrate cerebral patterns in patients with AD that are distinct from those of age-matched persons who are cognitively intact.

Detailed Description
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This is a naturalistic study in which clinical evaluations and brain scans will be performed on 20 people with Down syndrome (DS) as well as 20 healthy controls across a range of ages. Participants will receive comprehensive clinical and neuropsychological assessments. PET and MRI scans will be performed at baseline and after two years of follow up. All participants will have blood drawn for APOE genotyping during their baseline evaluations. The intellectual range of participants with DS will be restricted to IQ scores of 45 to 60 (moderate range) to reduce variability, particularly due to extreme low levels of intellectual ability.

Official Title
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Amyloid Plaque and Tangle Imaging in Alzheimer's Disease and Down Syndrome

Conditions
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Down Syndrome, Alzheimer's Disease

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Age 21 years or older No significant cerebrovascular disease - modified Ischemic Score of < 4 Adequate visual and auditory acuity to allow neuropsychological testing Screening laboratory tests and ECG without significant abnormalities that might interfere with the study Additional Inclusion Criteria for Controls MMSE score between 24 and 30 (unless < 8 years of educational achievement) The following medications are allowed if stable for > 1 month: antidepressants (without anticholinergic effects) if not currently depressed and no history of major depression for 2 years; estrogen replacement therapy; thyroid replacement therapy as long as individual is euthyroid; antihypertensives that do not influence cognitive function Additional Inclusion Criteria for Individuals with Down syndrome Family member or caregiver available; caregiver relationship 2 years or longer Karyotype DX of trisomy or translocation DS Mosaic form of Down syndrome English-speaking Exclusion Criteria: Evidence of neurological or other physical illness that could produce cognitive deterioration; volunteers with a history of TIAs, carotid bruits, or lacunes on MRI scan will be excluded Parkinson's Disease History of myocardial infarction within the previous year or unstable cardiac disease Uncontrolled hypertension (systolic BP > 170 or diastolic BP > 100), history of significant liver disease, clinically significant pulmonary disease, diabetes, or cancer Major psychiatric disorders, such as bipolar disorder or schizophrenia Medicines that could influence psychometric test results Use of any of the following drugs: centrally active beta-blockers, narcotics, clonidine, anti-Parkinsonian medications, benzodiazepines, systemic corticosteroids, medications with significant cholinergic or anticholinergic effects, anti-convulsants, or warfarin Current diagnosis or history of alcoholism or drug dependence Evidence of untreated depression or untreated anxiety Use of any investigational drugs within the previous month or longer, depending on drug half-life Contraindication for MRI scan (e.g., metal in body, claustrophobia) Diagnosis of possible or probable AD or any other dementia (e.g., vascular, Lewy body, frontotemporal) or MCI Additional Exclusion Criteria for Individuals with Down syndrome Mosaic form of Down syndrome History of clinically significant neurological disorder or disease and Psychiatric diagnosis or treatment within 3 months prior to screening

Ages Eligible for Study
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Minimum Age: 21 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| DS<br>Those with Down syndrome | |
| Non-DS<br>Healthy controls | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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PET Scan