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- W2124502511 abstract "1,2:5,6-Dibenzanthracene (DBA) is ubiquitous in our environment as a contaminant produced by incomplete combustion of organics from sources such as forest fires, cigarette smoke, and asphalt paving, and it is more immunosuppressive of the T-dependent antibody-forming cell (AFC) response than the well-studied polycyclic aromatic hydrocarbon, benzo(a)pyrene. The systemic immunosuppressive effects of DBA were investigated following a single pharyngeal aspiration (pa) in female B(6)C(3)F(1) mice. The immunotoxic effects of DBA were evaluated using numerous assays of varying complexity to evaluate innate (natural killer [NK] cell activity), cell-mediated (T-lymphocyte proliferation, mixed leukocyte response [MLR], cytotoxic T-lymphocyte [CTL] activity, delayed-type hypersensitivity [DTH]), and humoral immunity (B-lymphocyte proliferation, T-dependent antibody responses). A single pa of DBA at doses up to 30 mg/kg had no effect on NK cell activity, anti-CD3 antibody-mediated T-lymphocyte proliferation, the MLR, or B-lymphocyte proliferation. DBA at 30 mg/kg suppressed Concanavalin A (ConA)-stimulated T-lymphocyte proliferation and the CTL response. DBA exposure reduced cytokine production in spleen cell culture supernatants after in vitro stimulation with ConA or lipopolysaccharide (LPS). Immunosuppression was observed at lower doses in the holistic assays. The DTH response to Candida albicans was significantly decreased at 3.0 mg/ kg DBA, while the AFC response was intermittently suppressed at 1.0 mg/kg, with no effect observed at 0.3 mg/kg. These results demonstrate that a single pa of DBA produces systemic immunotoxicity, and of the assays utilized, the holistic assays (i.e., DTH, AFC) appear to be most sensitive to the immunosuppressive effects of DBA." @default.
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- W2124502511 date "2010-05-28" @default.
- W2124502511 modified "2023-10-16" @default.
- W2124502511 title "Systemic immunosuppression following a single pharyngeal aspiration of 1,2:5,6-dibenzanthracene in female B<sub>6</sub>C<sub>3</sub>F<sub>1</sub>mice" @default.
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- W2124502511 doi "https://doi.org/10.3109/1547691x.2010.487193" @default.
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