Enhanced expression of WD repeat-containing protein 35 (WDR35) stimulated by domoic acid in rat hippocampus: involvement of reactive oxygen species generation and p38 mitogen-activated protein kinase activation

BMC Neuroscience

Research Article

Naohisa Ishikawa¹  Koji Tsunekawa¹  Guo-Gang Feng¹  Shoshiro Okada¹  Teruhiko Okada¹  Fumio Kondo¹  Lei Huang¹ 

[1] Department of Pharmacology, Aichi Medical University School of Medicine, 1-1 Yazakokarimata, 480-1195, Nagakute, Aichi, Japan;

关键词: Domoic acid;    WDR35;    Hippocampus;    AMPA/KA receptor;    ROS;    p38 MAPK;   

DOI  :  10.1186/1471-2202-14-4

 received in 2012-07-26, accepted in 2013-01-03,  发布年份 2013

来源: Springer

【 摘 要 】

BackgroundDomoic acid (DA) is an excitatory amino acid analogue of kainic acid (KA) that acts via activation of glutamate receptors to elicit a rapid and potent excitotoxic response, resulting in neuronal cell death. Recently, DA was shown to elicit reactive oxygen species (ROS) production and induce apoptosis accompanied by activation of p38 mitogen-activated protein kinase (MAPK) in vitro. We have reported that WDR35, a WD-repeat protein, may mediate apoptosis in several animal models. In the present study, we administered DA to rats intraperitoneally, then used liquid chromatography/ion trap tandem mass spectrometry (LC-MS/MS) to identify and quantify DA in the brains of the rats and performed histological examinations of the hippocampus. We further investigated the potential involvement of glutamate receptors, ROS, p38 MAPK, and WDR35 in DA-induced toxicity in vivo.ResultsOur results showed that intraperitoneally administered DA was present in the brain and induced neurodegenerative changes including apoptosis in the CA1 region of the hippocampus. DA also increased the expression of WDR35 mRNA and protein in a dose- and time-dependent manner in the hippocampus. In experiments using glutamate receptor antagonists, the AMPA/KA receptor antagonist NBQX significantly attenuated the DA-induced increase in WDR35 protein expression, but the NMDA receptor antagonist MK-801 did not. In addition, the radical scavenger edaravone significantly attenuated the DA-induced increase in WDR35 protein expression. Furthermore, NBQX and edaravone significantly attenuated the DA-induced increase in p38 MAPK phosphorylation.ConclusionIn summary, our results indicated that DA activated AMPA/KA receptors and induced ROS production and p38 MAPK phosphorylation, resulting in an increase in the expression of WDR35 in vivo.

【 授权许可】

CC BY   
© Tsunekawa et al.; licensee BioMed Central Ltd. 2013