Healthy Clinical Trial
Official title:
PET Imaging of Brain Amyloid Using [11C]MeS-IMPY
Alzheimer's disease is associated with accumulation in the brain of a protein called amyloid. The purpose of this study is to test the ability of a research drug to measure amyloid in brain using positron emission tomography (PET) and a research drug called [11C]MeS-IMPY.
Alzheimer's disease (AD) is characterized pathologically by the presence of beta-amyloid plaques in brain. A substantial body of research indicates that the presence of increased beta -amyloid peptide is neurotoxic, and may initiate further pathology observed in AD including neurofibrillary tangles, synaptic loss and dysfunction, and neurodegeneration. There are multiple binding sites available on beta-amyloid plaques. Three clearly identified sites are Congo-red type, Thioflavin-T type, and FDDNP type. Radioligands currently under development using positron emission tomography (PET) for studying beta-amyloid in clinical research or drug development are based on Thioflavin-T site, such as [11C]PIB and [11C]SB-13. Though variously effective, these radioligands have one or more drawbacks with respect to measuring relative regional beta-amyloid densities. Therefore, we have recently developed [11C]MeS-IMPY as an alternative radioligand for imaging beta-amyloid, which will allow a more accurate quantification of amyloid plaques in AD brain. In the current protocol, we wish to evaluate [11C]MeS-IMPY in both healthy subjects and AD patients to determine the kinetics of brain imaging beta-amyloid plaques in AD patients. ;
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