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Neuron. 2017 Sep 27;96(1):115-129.e5. doi: 10.1016/j.neuron.2017.09.003.

Apolipoprotein E4 Impairs Neuronal Insulin Signaling by Trapping Insulin Receptor in the Endosomes.

Author information

1
Department of Neuroscience, Mayo Clinic, Jacksonville, FL 32224, USA.
2
Department of Neuroscience, Mayo Clinic, Jacksonville, FL 32224, USA. Electronic address: liu.chiachen@mayo.edu.
3
Departments of Medicine, Duke University School of Medicine, Durham, NC 27710, USA; GRECC, Durham Veterans Affairs Medical Center, Durham, NC 27705, USA.
4
Department of Neuroscience, Mayo Clinic, Jacksonville, FL 32224, USA; Fujian Provincial Key Laboratory of Neurodegenerative Disease and Aging Research, Institute of Neuroscience, College of Medicine, Xiamen University, Xiamen, Fujian, 361005, China. Electronic address: bu.guojun@mayo.edu.

Abstract

Diabetes and impaired brain insulin signaling are linked to the pathogenesis of Alzheimer's disease (AD). The association between diabetes and AD-associated amyloid pathology is stronger among carriers of the apolipoprotein E (APOE) ε4 gene allele, the strongest genetic risk factor for late-onset AD. Here we report that apoE4 impairs neuronal insulin signaling in human apoE-targeted replacement (TR) mice in an age-dependent manner. High-fat diet (HFD) accelerates these effects in apoE4-TR mice at middle age. In primary neurons, apoE4 interacts with insulin receptor and impairs its trafficking by trapping it in the endosomes, leading to impaired insulin signaling and insulin-stimulated mitochondrial respiration and glycolysis. In aging brains, the increased apoE4 aggregation and compromised endosomal function further exacerbate the inhibitory effects of apoE4 on insulin signaling and related functions. Together, our study provides novel mechanistic insights into the pathogenic mechanisms of apoE4 and insulin resistance in AD.

KEYWORDS:

APOE; Aggregation; Aging; Alzheimer’s disease; Endosomal dysfunction; Insulin signaling; Trafficking

PMID:
28957663
PMCID:
PMC5621659
DOI:
10.1016/j.neuron.2017.09.003
[Indexed for MEDLINE]
Free PMC Article

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