In Vivo Formation and Binding of SeHg Complexes to the Erythrocyte Surface |
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Authors: | Duangrudee Cherdwongcharoensuk Maria João Oliveira Artur Perez Águas |
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Institution: | (1) ICBAS, Department of Anatomy and UMIB, Abel Salazar Institute for Biomedical Sciences, University of Porto, 4099-033 Porto, Portugal;(2) Department of Medical Science, Faculty of Science, Burapha University, Bangsaen, Thailand; |
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Abstract: | The in vivo dynamics of selenium (Se) and mercury (Hg) interaction was studied in mouse tissues using direct visualization
of individual Se, Hg, and SeHg particles on the surface of circulating erythrocytes. This high-resolution detection of Se
and Hg was obtained by scanning electron microscopy coupled to X-ray microanalysis. BALB/c mice were injected in the peritoneal
cavity with Se and Hg salts, and the animals were sacrificed 3 min after the Hg injection. Only a minority (9%) of the metal
dots seen on mouse liver erythrocytes were SeHg complexes when Se and Hg salts were mixed together before injection. In contrast,
the majority (73%) of metal dots on liver erythrocytes were SeHg complexes if Se was injected at least 5 min before Hg injection.
All metal dots on liver erythrocytes were of SeHg complexes if Se was injected 9 or 12 min before the Hg injection. We conclude
that the formation of stable in vivo SeHg complexes requires preliminary interaction of Se with a putative serum factor before
complexes between Se and Hg are formed and are bound to the erythrocyte cell surface. |
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