Postmortem pittsburgh compound B (PiB) binding increases with Alzheimer's disease progression

Tina L. Beckett, Robin L. Webb, Dana M. Niedowicz, Christopher J. Holler, Sergey Matveev, Irfan Baig, Harry Le Vine, Jeffrey N. Keller, M. Paul Murphy

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The development of imaging reagents is of considerable interest in the Alzheimer's disease (AD) field. Some of these, such as Pittsburgh Compound B (PiB), were designed to bind to the amyloid-β peptide (Aβ), the major component of amyloid deposits in the AD brain. Although these agents were designed for imaging amyloid deposits in vivo, a major avenue of evaluation relies on postmortem cross validation with established indices of AD pathology. In this study, we evaluated changes in the postmortem binding of PiB and its relationship to other aspects of Aβ-related pathology in a series of AD cases and age-matched controls. We also examined cases of preclinical AD (PCAD) and amnestic mild cognitive impairment (MCI), both considered early points in the AD continuum. PiB binding was found to increase with the progression of the disease and paralleled increases in the less soluble forms of Aβ, including SDS-stable Aβ oligomers. Increased PiB binding and its relationship to Aβ was only significant in a brain region vulnerable to the development of AD pathology (the superior and middle temporal gyri) but not in an unaffected region (cerebellum). This implies that the amyloid deposited in disease-affected regions may possess fundamental, brain region specific characteristics that may not as yet be fully appreciated. These data support the idea that PiB is a useful diagnostic tool for AD, particularly in the early stage of the disease, and also show that PiB could be a useful agent for the discovery of novel disease-related properties of amyloid.

Original languageEnglish
Pages (from-to)127-138
Number of pages12
JournalJournal of Alzheimer's Disease
Volume32
Issue number1
DOIs
StatePublished - 2012

Keywords

  • Alzheimer's disease
  • amyloid-β peptide
  • amyloid-β protein precursor
  • frontotemporal dementia
  • mild cognitive impairment
  • preclinical Alzheimer's disease

ASJC Scopus subject areas

  • General Neuroscience
  • Clinical Psychology
  • Geriatrics and Gerontology
  • Psychiatry and Mental health

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