Hearing loss is an early biomarker in APP/PS1 Alzheimer's disease mice

Yang Liu, Shu Fang, Li Man Liu, Yan Zhu, Chang Ri Li, Kaitian Chen, Hong Bo Zhao

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Alzheimer's disease (AD) is a neurodegenerative disease characterized by a progressive loss of memory and cognitive decline. Over the last decade, it has been found that defects in sensory systems could be highly associated with AD. Hearing is an important neural sense. However, little is known about hearing functional changes in AD. In this study, APP/PS1 AD mice (Jackson Lab: Stack No. 004462) were used. Hearing function was assessed by auditory brainstem response (ABR), distortion product otoacoustic emission (DPOAE), and cochlear microphonics (CM) recordings. Wild-type (WT) littermates served as control. We found that APP/PS1 AD mice measured as ABR threshold had hearing loss. The hearing loss appeared at high frequency as early as 2 months old, prior to the reported occurrence of spatial learning deficit at 6–7 months of age in this AD mouse model. The hearing loss was progressive and extended from high frequency to low frequency. At 3–4 months old, the hearing loss appeared in the whole-frequency range. Moreover, the wave IV and V in the super-threshold ABR were eliminated, indicating substantial impairment in inferior colliculus, nuclei of lateral lemniscus, and medial geniculate body in the upper brainstem. DPOAE in APP/PS1 AD mice was also reduced. However, there was no reduction in CM in APP/PS1 mice. These data demonstrate that unlike age-related hearing loss APP/PS1 AD mice have early onset of hearing loss. These data also suggest that hearing function testing could provide a simple, sensitive, non-invasive screen-tool for early detecting AD and localizing lesion.

Original languageEnglish
Article number134705
JournalNeuroscience Letters
Volume717
DOIs
StatePublished - Jan 19 2020

Bibliographical note

Funding Information:
This work was supported by NIH R01 DC 017025 , DC 017025-01S1 , and R56 DC 016585 to HBZ. Appendix A

Publisher Copyright:
© 2019

Keywords

  • Age-related hearing loss
  • Alzheimer's disease
  • Auditory brainstem
  • Auditory brainstem response
  • Early AD biomarker
  • Hearing loss
  • Preclinical AD

ASJC Scopus subject areas

  • Neuroscience (all)

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