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Neurobiol Aging. 2014 Jun;35(6):1318-24. doi: 10.1016/j.neurobiolaging.2013.12.030. Epub 2013 Dec 27.

Interaction between sleep-disordered breathing and apolipoprotein E genotype on cerebrospinal fluid biomarkers for Alzheimer's disease in cognitively normal elderly individuals.

Author information

  • 1Center for Brain Health, NYU School of Medicine, New York, NY, USA; Alzheimer Disease Research Unit, CIEN Foundation, Carlos III Institute of Health, Alzheimer Center Reina Sofia Foundation, Madrid, Spain. Electronic address: Ricardo.Osorio@nyumc.org.
  • 2Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, NYU School of Medicine, New York, NY, USA.
  • 3Center for Brain Health, NYU School of Medicine, New York, NY, USA.
  • 4Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, The Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden.
  • 5Department of Biostatistics, Rutgers School of Public Health, Piscataway, NJ, USA.

Abstract

Previous studies have suggested a link between sleep disordered breathing (SDB) and dementia risk. In the present study, we analyzed the relationship between SDB severity, cerebrospinal fluid (CSF) Alzheimer's disease-biomarkers, and the ApoE alleles. A total of 95 cognitively normal elderly participants were analyzed for SDB severity, CSF measures of phosphorylated-tau (p-tau), total-tau (t-tau), and amyloid beta 42 (Aβ-42), as well as ApoE allele status. In ApoE3+ subjects, significant differences were found between sleep groups for p-tau (F[df2] = 4.3, p = 0.017), and t-tau (F[df2] = 3.3, p = 0.043). Additionally, among ApoE3+ subjects, the apnea and/or hypopnea with 4% O2-desaturation index was positively correlated with p-tau (r = 0.30, p = 0.023), t-tau (r = 0.31, p = 0.021), and Aβ-42 (r = 0.31, p = 0.021). In ApoE2+ subjects, the apnea and/or hypopnea with 4% O2-desaturation index was correlated with lower levels of CSF Aβ-42 (r = -0.71, p = 0.004), similarly to ApoE4+ subjects where there was also a trend toward lower CSF Aβ-42 levels. Our observations suggest that there is an association between SDB and CSF Alzheimer's disease-biomarkers in cognitively normal elderly individuals. Existing therapies for SDB such as continuous positive airway pressure could delay the onset to mild cognitive impairment or dementia in normal elderly individuals.

KEYWORDS:

Alzheimer's disease; Amyloid beta 42; ApoE; Biomarkers; CSF; Cerebral amyloid angiopathy; Elderly; Sleep-disordered breathing; p-tau

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