http://www.sciencedirect.com/science/article/pii/S0009279713002032
- a Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
- b Departamento de Biologia Celular, Embriologia e Genética, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
- c Grupo de pesquisa em Bioanálises, Centro Universitário Feevale, Instituto de Ciências da Saúde, Novo Hamburgo, RS, Brazil
- d Departamento de Química, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
Highlights
- •
- The electron transfer chain is a sensitive target of MeHg toxicity.
- •
- MeHg-induced mitochondrial dysfunction could be prevented if (PhSe)2 is co-administered.
- •
- MeHg-exposed mice showed low cortical BDNF content and increased DNA damage.
- •
- (PhSe)2 protects from neurochemical MeHg-induced alterations.
- •
- (PhSe)2 could be consider as a new neuroprotectant.
Abstract
Interest
in organoselenide chemistry and biochemistry has increased in the past
three decades, mainly due to their chemical and biological activities.
Here, we investigated the protective effect of the organic selenium
compound diphenyl diselenide (PhSe)2 (5 μmol/kg), in a mouse
model of methylmercury (MeHg)-induced brain toxicity. Our group has
previously demonstrated that the oral and repeated administration (21
days) of MeHg (40 mg/L) induced MeHg brain accumulation at toxic
concentrations, and a pattern of severe cortical and cerebellar
biochemical and behavioral. In order to assess neurotoxicity, the
neurochemical parameters, namely, mitochondrial complexes I, II, II-III
and IV, glutathione peroxidase (GPx) and glutathione reductase (GR)
activities, the content of thiobarbituric acid-reactive substances
(TBA-RS), 8-hydroxy-2’-deoxyguanosine (8-OHdG), and brain-derived
neurotrophic factor (BDNF), as well as, metal deposition were
investigated in mouse cerebral cortex. Cortical neurotoxicity induced by
brain MeHg deposition was characterized by the reduction of complexes
I, II, and IV activities, reduction of GPx and increased GR activities,
increased TBA-RS and 8-OHdG content, and reduced BDNF levels. The daily
treatment with (PhSe)2 was able to counteract the inhibitory
effect of MeHg on mitochondrial activities, the increased oxidative
stress parameters, TBA-RS and 8-OHdG levels, and the reduction of BDNF
content. The observed protective (PhSe)2 effect could be
linked to its antioxidant properties and/or its ability to reduce MeHg
deposition in brain, which was here histochemically corroborated.
Altogether, these data indicate that (PhSe)2 could be consider as a neuroprotectant compound to be tested under neurotoxicity.
No comments:
Post a Comment