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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Evaluation of possible effects of 2,3,7,8-tetrachlorodibenzo-p-dioxin and other congeners on lymphocyte receptors in Callithrix jacchus and man.

Using fluorescence-labeled monoclonal antibodies and flow cytometry (FACScan analysis) we measured surface receptors on peripheral lymphocytes in marmosets (Callithrix jacchus) treated with TCDD in the lower nanogram per kilogram range. Additionally, some polybrominated congeners were studied as well as a 2,3,7,8-substituted dioxin containing chlorine and bromine in the same molecule. Callithrix was found to be very sensitive to the action of TCDD and the other tetrahalogenated congeners; single doses of 10-30 ng/kg body weight reproducibly induced a decrease in the percentage and absolute number of 'memory' helper T cells [CD4+CD29(bright)] and of B cells (CD20+). Subsequently, according to the hypothesis based on the marmoset data, extensive analyses on surface receptors of white blood cells were performed in workers with moderately increased body burdens of TCDD, and for further hypothesis generation > 60 triple-labeling assays were performed with each of the blood samples. No decrease in typical surface receptors (CD4+CD45R0+CD45RA-CD29(bright) or CD20+) was found in the human adult volunteers studied, but a trend toward an increase was noted. It cannot be decided whether this may be a substance-related effect, or results from a confounder (possibly age differences between the groups).[1]


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