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Related Experiment Videos

Vanadium distribution following decavanadate administration.

S S Soares1, H Martins, M Aureliano

  • 1Group of Comparative Cardiovascular Physiopathology, CCMar, Faculty of Marine and Environmental Science, University of Algarve, Campus de Gambelas, Faro, 8005-139, Portugal.

Archives of Environmental Contamination and Toxicology
|September 10, 2005
PubMed
Summary
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Different vanadate forms, metavanadate and decavanadate, show distinct vanadium distribution in gilthead seabream. Decavanadate leads to greater vanadium accumulation in cardiac mitochondria, impacting fish cardiac muscle.

Area of Science:

  • Environmental toxicology
  • Marine biology
  • Biochemistry

Background:

  • Vanadium compounds are used industrially and can enter aquatic environments.
  • Understanding vanadium's subcellular distribution is crucial for assessing its toxicity in marine organisms.
  • Sparus aurata (gilthead seabream) is a commercially important fish species, making it a relevant model for ecotoxicological studies.

Purpose of the Study:

  • To investigate the differential subcellular distribution of vanadium in Sparus aurata following acute exposure to metavanadate and decavanadate solutions.
  • To compare the uptake and accumulation patterns of different vanadate oligomers in blood plasma, red blood cells, and cardiac muscle.

Main Methods:

  • Intravenous administration of metavanadate and decavanadate solutions (5 mM) to Sparus aurata.

Related Experiment Videos

  • Analysis of vanadium concentration in blood plasma, red blood cells (RBC), and cardiac muscle subcellular fractions (cytosol, mitochondria) at 1, 6, and 12 hours post-exposure.
  • Quantification of vanadium using appropriate analytical techniques.

    • Main Results:

    • Highest vanadium levels were observed in blood plasma 1 hour after administration, significantly higher than in RBC.
    • Vanadium concentration in plasma and cardiac cytosol decreased by approximately 50% between 1 and 12 hours.
    • Both vanadate forms were predominantly accumulated in the mitochondrial fraction of cardiac muscle, with levels twofold higher than in cytosol.
    • Decavanadate exposure resulted in earlier and higher accumulation of vanadium in cardiac mitochondria compared to metavanadate.

    Conclusions:

    • Subcellular vanadium distribution in fish cardiac muscle is dependent on the specific vanadate oligomer administered.
    • Decavanadate leads to a distinct vanadium distribution pattern, characterized by initial plasma distribution followed by significant accumulation in cardiac mitochondria.
    • These findings highlight the importance of considering the chemical form of vanadium when assessing its environmental impact and toxicological effects on aquatic organisms.