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Title:	Alzheimer's disease mutant mice exhibit reduced brain tissue stiffness compared to wild-type mice in both normoxia and following intermittent hypoxia mimicking sleep apnea
Author:	Menal, Maria Jose; Jorba, Ignasi; Torres, Marta; Montserrat, Josep M.; Gozal, David; Colell, Anna; Pinol Ripoll, Gerard; Navajas Navarro, Daniel; Almendros López, Isaac; Farré Ventura, Ramon
Other authors:	Universitat de Barcelona
Abstract:	Background: Evidence from patients and animal models suggests that obstructive sleep apnea (OSA) may increase the risk of Alzheimer's disease (AD) and that AD is associated with reduced brain tissue stiffness.Aim: To investigate whether intermittent hypoxia (IH) alters brain cortex tissue stiffness in AD mutant mice exposed to IH mimicking OSA.Methods: Six-eight month old (B6C3-Tg(APPswe, PSEN1dE9)85Dbo/J) AD mutant mice and wild-type (WT) littermates were subjected to IH (21% O-2 40 s to 5% O-2 20 s; 6 h/day) or normoxia for 8 weeks. After euthanasia, the stiffness (E) of 200-mu m brain cortex slices was measured by atomic force microscopy.Results: Two-way ANOVA indicated significant cortical softening and weight increase in AD mice compared to WT littermates, but no significant effects of IH on cortical stiffness and weight were detected. In addition, reduced myelin was apparent in AD (vs. WT), but no significant differences emerged in the cortex extracellular matrix components laminin and glycosaminoglycans when comparing baseline AD and WT mice.Conclusion: AD mutant mice exhibit reduced brain tissue stiffness following both normoxia and IH mimicking sleep apnea, and such differences are commensurate with increased edema and demyelination in AD.
Subject(s):	-Malaltia d'Alzheimer -Síndromes d'apnea del son -Malalties neurodegeneratives -Models animals en la investigació -Alzheimer's disease -Sleep apnea syndromes -Neurodegenerative Diseases -Animal models in research
Rights:	cc-by (c) Menal, Maria Jose et al., 2018 http://creativecommons.org/licenses/by/3.0/es
Document type:	Article Article - Published version
Published by:	Frontiers Media
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