High-fat diet-induced obesity exacerbates kainic acid-induced hippocampal cell death.

Abstract:

BACKGROUND:Obesity has deleterious effects on the brain, and metabolic dysfunction may exacerbate the outcomes of seizures and brain injuries. However, it is unclear whether obesity affects excitotoxicity-induced neuronal cell death. The purpose of this study was to investigate the effects of a high-fat diet (HFD) on neuroinflammation and oxidative stress in the hippocampus of kainic acid (KA)-treated mice. RESULTS:Mice were fed with a HFD or normal diet for 8 weeks and then received a systemic injection of KA. HFD-fed mice showed hypercholesterolemia, insulin resistance, and hepatic steatosis. HFD-fed mice showed greater susceptibility to KA-induced seizures, an increased number of terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL)-positive cells, neuroinflammation, and oxidative stress. Furthermore, we found that KA treatment increased HFD-induced calpain1, nuclear factor E2-related factor 2, and heme oxygenase-1 expression in the hippocampus. CONCLUSIONS:These findings imply that complex mechanisms affected by obesity-induced systemic inflammation, neuroinflammation, ER stress, calcium overload, and oxidative stress may contribute to neuronal death after brain injury.

journal_name

BMC Neurosci

journal_title

BMC neuroscience

authors

Kang DH,Heo RW,Yi CO,Kim H,Choi CH,Roh GS

doi

10.1186/s12868-015-0202-2

subject

Has Abstract

pub_date

2015-10-30 00:00:00

pages

72

issn

1471-2202

pii

10.1186/s12868-015-0202-2

journal_volume

16

pub_type

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