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Decavanadate toxicity effects following in vivo administration
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Resumo(s)
Very few in vivo animal studies involving vanadium consider the contribution of decavanadate (V10) to vanadium
biological effects. Recently, it is been suggested that decameric vanadate may not completely fall apart into other vanadate oligomers before induces changes in cell
homeostasis, namely in several stress markers. An acute exposure of different fish species (Halobactrachus didactilus,
Lusitanian toadfish, and Sparus aurata, gilthead seabream) to decavanadate, but not to other vanadate oligomers,
induced different effects than vanadate in catalase activity, glutathione content, lipid peroxidation, mitochondrial
superoxide anion production and vanadium accumulation, whereas both solutions seem to equally depress reactive oxygen species (ROS) production as well as total
intracellular reducing power. Vanadium is accumulated in Sparus aurata mitochondria in particular when decavanadate is administrated. Moreover, exposure to different vanadate oligomers induced morphological changes in fish cardiac,
hepatic and renal tissues causing tissues lesions in the liver and kidney, but not cardiac tissue. Nevertheless, the results
highlight that different vanadate oligomers seem to follow, not only in vitro but also in vivo, different pathways, with different targets and effects. These recent findings, that are now summarized, point out the decameric vanadate species contributions to in vivo effects induced by vanadium in
biological systems.
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Palavras-chave
Oxidative stress Vanadium