Progressive age-related changes in sleep and EEG profiles in the PLB1Triple mouse model of Alzheimer's disease

Sleep disturbances are common in Alzheimer's disease (AD) and now assumed to contribute to disease onset and progression. Here, we investigated whether activity, sleep/wake pattern, and electroencephalogram (EEG) profiles are altered in the knock-in PLB1(Triple) mouse model from 5 to 21 months of age. PLB1(Triple) mice displayed a progressive increase in wakefulness and non-rapid eye movement sleep fragmentation from 9 months onward, whereas PLB1(WT) wild type controls showed such deterioration only at 21 months. Impaired habituation to spatial novelty was also detected in PLB1(Triple) mice. Hippocampal power spectra of transgenic mice revealed progressive, vigilance stage-, brain region-, and age-specific changes. Age had an impact on EEG spectra in both cohorts but led to accelerated genotype-dependent differences, ultimately affecting all bands at 21 months. Overall, although PLB1(Triple) animals display only subtle amyloid and tau pathologies, robust sleep-wake and EEG abnormalities emerged. We hypothesize that such endophenotypes are sensitive, noninvasive, and reliable biomarker to identify onset and progression of AD. (C) 2015 Elsevier Inc. All rights reserved.