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- W2012136304 abstract "Exposure to polychlorinated biphenyls (PCBs) is known to suppress immune system function and this action is usually ascribed to dioxin-like PCBs that act via the Ah receptor. We have studied the effects of one ortho-substituted, non-dioxin-like PCB (PCB 52) and one coplanar, dioxin-like congener (PCB 77) on properties of thymocytes acutely isolated from mice. Viability of thymocytes was dose- and time-dependently reduced by PCB 52 with a threshold concentration of about 1 microM, while there was no effect of PCB 77 on viability at concentrations less than 10 microM. Cell death was detectible within 5 min of exposure. Both congeners caused a dose-dependent increase in [Ca(2+)](i), but the threshold concentration was 1 microM for PCB 52 and 5 microM for PCB 77. However, the cell death was not due to the elevation of [Ca(2+)](i), since it was not reduced by incubation in Ca-free Tyrode's Solution. PCB 52, but not PCB 77, caused an increase in membrane fluidity at a concentration of 5 microM. These observations are consistent with previous results that suggest that ortho-substituted PCB congeners dissolve in cell membrane and cause greater disruption of function than do dioxin-like PCB congeners." @default.
- W2012136304 created "2016-06-24" @default.
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- W2012136304 date "2006-01-16" @default.
- W2012136304 modified "2023-10-05" @default.
- W2012136304 title "Effects of PCB 52 and PCB 77 on cell viability, [Ca2+]i levels and membrane fluidity in mouse thymocytes" @default.
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- W2012136304 doi "https://doi.org/10.1016/j.tox.2005.09.008" @default.
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