Journal
NEUROBIOLOGY OF AGING
Volume 43, Issue -, Pages 47-57Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.neurobiolaging.2016.03.024
Keywords
Alzheimer's disease; Thermogenesis; Cold exposure; Thermoneutrality; 3xTg-AD
Categories
Funding
- Canadian Institutes of Health Research (CIHR) [MOP 102532, IAO 74443]
- Alzheimer Society Canada [15-02]
- Canada Foundation for Innovation (CFI) [34480, 10307]
- Fonds de la recherche en sante du Quebec (FRQ-S)
- CIHR Scholarship
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The sharp rise in the incidence of Alzheimer's disease (AD) at an old age coincides with a reduction in energy metabolism and core body temperature. We found that the triple-transgenic mouse model of AD (3xTg-AD) spontaneously develops a lower basal body temperature and is more vulnerable to a cold environment compared with age-matched controls. This was despite higher nonshivering thermogenic activity, as evidenced by brown adipose tissue norepinephrine content and uncoupling protein 1 expression. A 24-hour exposure to cold (4 degrees C) aggravated key neuropathologic markers of AD such as: tau phosphorylation, soluble amyloid beta concentrations, and synaptic protein loss in the cortex of 3xTg-AD mice. Strikingly, raising the body temperature of aged 3xTg-AD mice via exposure to a thermoneutral environment improved memory function and reduced amyloid and synaptic pathologies within a week. Our results suggest the presence of a vicious cycle between impaired thermoregulation and AD-like neuropathology, and it is proposed that correcting thermoregulatory deficits might be therapeutic in AD. (C) 2016 Elsevier Inc. All rights reserved.
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