AUTHOR=Liu Fan , Yan Weiheng , Chen Chen , Zeng Yubing , Kong Yaru , He Xuejia , Pei Pei , Wang Shan , Zhang Ting 

TITLE=Acetylome analyses provide novel insights into the effects of chronic intermittent hypoxia on hippocampus-dependent cognitive impairment

JOURNAL=Frontiers in Molecular Neuroscience

VOLUME=Volume 17 - 2024

YEAR=2024

URL=https://www.frontiersin.org/journals/molecular-neuroscience/articles/10.3389/fnmol.2024.1324458

DOI=10.3389/fnmol.2024.1324458

ISSN=1662-5099

ABSTRACT=Chronic intermittent hypoxia (CIH) can negatively affect hippocampal function through various molecular mechanisms. Protein acetylation, a frequently occurring modification, plays crucial roles in synaptic plasticity and cognitive processes. However, the global protein acetylation induced by CIH in the hippocampus and its specific effects on hippocampal function and behaviour remain poorly understood. To address this gap, we conducted a study using liquid chromatography-tandem mass spectrometry to analyse the lysine acetylome and proteome of the hippocampus in healthy adult mice exposed to intermittent hypoxia for 4 weeks (as a CIH model) compared to normoxic mice (as a control).Our analysis identified and quantified 2184 lysine acetylation sites in 1007 proteins. Our findings  revealed that CIH regulated 280 acetylation sites on 213 proteins, with mitochondrial proteins accounting for 35.75% of the acetylated proteins. Analysis of these acetylated proteins revealed disturbances primarily in oxidative phosphorylation, the tricarboxylic acid (TCA) cycle, and glycolysis, all of which are localized exclusively to mitochondria. Additionally, we observed significant changes in the abundance of 21 proteins, some of which are known to be associated with cognitive impairments.This study helps to elucidate the molecular mechanisms underlying CIH-induced changes in protein acetylation in the hippocampus. By providing valuable insights into the pathophysiological processes associated with CIH and their impacts on hippocampal function, our findings contribute to a better understanding of the consequences of CIH-induced changes in protein acetylation in the hippocampus and the potential role of CIH in cognitive impairment.