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Simultaneous Cd²⁺, Zn²⁺, and Pb²⁺ Uptake and Accumulation by Photosynthetic Euglena gracilis

Mendoza-Cózatl, D. G ; Rangel-González, E ; Moreno-Sánchez, R

Archives of environmental contamination and toxicology, 2006-11, Vol.51 (4), p.521-528 [Periódico revisado por pares]

Heidelberg: New York : Springer-Verlag

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Título:
Simultaneous Cd²⁺, Zn²⁺, and Pb²⁺ Uptake and Accumulation by Photosynthetic Euglena gracilis
Autor: Mendoza-Cózatl, D. G ; Rangel-González, E ; Moreno-Sánchez, R
Assuntos: Animal, plant and microbial ecology ; Animals ; Applied ecology ; bioaccumulation ; Biodegradation, Environmental ; Biological and medical sciences ; bioremediation ; cadmium ; Cadmium - pharmacokinetics ; Cells, Cultured ; Cellular biology ; Chemical contaminants ; Ecotoxicology, biological effects of pollution ; Euglena gracilis ; Euglena gracilis - metabolism ; Fundamental and applied biological sciences. Psychology ; General aspects ; heavy metals ; lead ; Lead - pharmacokinetics ; metal tolerance ; Photosynthesis ; Studies ; Sulfhydryl Compounds - analysis ; uptake mechanisms ; Water Pollutants, Chemical - pharmacokinetics ; water pollution ; zinc ; Zinc - pharmacokinetics
É parte de: Archives of environmental contamination and toxicology, 2006-11, Vol.51 (4), p.521-528
Notas: http://dx.doi.org/10.1007/s00244-005-0207-4
Descrição: The ability of Euglena gracilis to simultaneously remove and accumulate Zn²⁺, Cd²⁺, and Pb²⁺ from culture up- to media was evaluated. E. gracilis was able to remove up to 80% of the Cd²⁺ present in the medium when cultured with 20 or 50 μM CdCl₂. Higher external Cd²⁺ concentrations increased Cd²⁺ accumulation per cell but decreased cell growth, thus decreasing the capacity of the cell culture to remove Cd²⁺. E. gracilis removed 70% to 80% of the Zn²⁺ present in the medium when cultured with 5 to 50 μM ZnSO₄. Zn²⁺ did not affect Cd²⁺ removal capacity. E. gracilis was much less efficient in removing Pb²⁺ (<15%) when cultured with 100 or 200 μM Pb(NO₃)₂. Moreover, Pb²⁺ decreased the efficiency to remove Cd²⁺, but it did not affect Zn²⁺ removal. Cd²⁺ induced a generalized increase in the cellular thiol compounds, including phytochelatins, and Pb²⁺ had an additive effect only at 200 μM. Zn²⁺ did not stimulate phytochelatin synthesis. Cd²⁺ and Pb²⁺ colocated in the same cytosolic high-molecular-weight fraction. Because Pb²⁺ is a weak phytochelatin inducer, competition between Pb²⁺ and Cd²⁺ for transportation across the plasma membrane and binding to phytochelatins and other thiol compounds is proposed to explain the detrimental effects of Pb²⁺ on the Cd²⁺ removal capacity of E. gracilis.
Editor: Heidelberg: New York : Springer-Verlag
Idioma: Inglês

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Simultaneous Cd²⁺, Zn²⁺, and Pb²⁺ Uptake and Accumulation by Photosynthetic Euglena gracilis

Mendoza-Cózatl, D. G ; Rangel-González, E ; Moreno-Sánchez, R

Heidelberg: New York : Springer-Verlag

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