The chemokine CCL2 protects against methylmercury neurotoxicity.

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Serval ID
serval:BIB_35EF77BD51EC
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
The chemokine CCL2 protects against methylmercury neurotoxicity.
Journal
Toxicological Sciences
Author(s)
Godefroy D., Gosselin R.D., Yasutake A., Fujimura M., Combadière C., Maury-Brachet R., Laclau M., Rakwal R., Melik-Parsadaniantz S., Bourdineaud J.P., Rostène W.
ISSN
1096-0929 (Electronic)
ISSN-L
1096-0929
Publication state
Published
Issued date
2012
Volume
125
Number
1
Pages
209-218
Language
english
Abstract
Industrial pollution due to heavy metals such as mercury is a major concern for the environment and public health. Mercury, in particular methylmercury (MeHg), primarily affects brain development and neuronal activity, resulting in neurotoxic effects. Because chemokines can modulate brain functions and are involved in neuroinflammatory and neurodegenerative diseases, we tested the possibility that the neurotoxic effect of MeHg may interfere with the chemokine CCL2. We have used an original protocol in young mice using a MeHg-contaminated fish-based diet for 3 months relevant to human MeHg contamination. We observed that MeHg induced in the mice cortex a decrease in CCL2 concentrations, neuronal cell death, and microglial activation. Knock-out (KO) CCL2 mice fed with a vegetal control food already presented a decrease in cortical neuronal cell density in comparison with wild-type animals under similar diet conditions, suggesting that the presence of CCL2 is required for normal neuronal survival. Moreover, KO CCL2 mice showed a pronounced neuronal cell death in response to MeHg. Using in vitro experiments on pure rat cortical neurons in culture, we observed by blockade of the CCL2/CCR2 neurotransmission an increased neuronal cell death in response to MeHg neurotoxicity. Furthermore, we showed that sod genes are upregulated in brain of wild-type mice fed with MeHg in contrast to KO CCL2 mice and that CCL2 can blunt in vitro the decrease in glutathione levels induced by MeHg. These original findings demonstrate that CCL2 may act as a neuroprotective alarm system in brain deficits due to MeHg intoxication.
Pubmed
Web of science
Open Access
Yes
Create date
17/02/2012 14:59
Last modification date
25/09/2019 7:08
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