Alterations of the volatile metabolome in mouse models of Alzheimer’s disease

Authors

Bruce A. Kimball, USDA-APHIS, National Wildlife Research CenterFollow
Donald A. Wilson, Emotional Brain Institute, Nathan S. Kline Institute for Psychiatric Research, Orangeburg, NY
Daniel W. Weason, Case Western Reserve University

Date of this Version

2016

Citation

Scientific Reports 6:19495

Comments

U.S. Government Work

Abstract

In the present study, we tested whether the volatile metabolome was altered by mutations of the Alzheimer’s disease (AD)-implicated amyloid precursor protein gene (APP) and comprehensively examined urinary volatiles that may potentially serve as candidate biomarkers of AD. Establishing additional biomarkers in screening populations for AD will provide enhanced diagnostic specificity and will be critical in evaluating disease-modifying therapies. Having strong evidence of gross changes in the volatile metabolome of one line of APP mice, we utilized three unique mouse lines which over-express human mutations of the APP gene and their respective non-transgenic litter-mates (NTg). Head-space gas chromatography/mass spectrometry (GC/MS) of urinary volatiles uncovered several aberrant chromatographic peak responses. We later employed linear discrimination analysis and found that the GC/MS peak responses provide accurate (>84%) genotype classification of urinary samples. These initial data in animal models show that mutant APP gene expression entails a uniquely identifiable urinary odor, which if uncovered in clinical AD populations, may serve as an additional biomarker for the disease.