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. 1978 Apr;23:233–239. doi: 10.1289/ehp.7823233

Effect of polybrominated biphenyls on hepatic excretory function in rats and mice.

S Z Cagen, J E Gibson
PMCID: PMC1637484  PMID: 209981

Abstract

The purpose of this investigation was to determine the influence of polybrominated biphenyls (PBBs) on hepatic excretory function in developing and adult rats and mice. Prenatal or postnatal dietary exposure to PBBs (50 ppm in diet of pregnant or lactating mother or in diet of rat weanlings) resulted in elevated liver weight in developing rats. In 15-day-old rats that had been treated with PBBs increased liver weight correlated to enhanced ouabain transport from plasma into bile. Liver weight was also elevated in 21, 35, and 49-day-old rats exposed to PBBs, but this effect was not associated with stimulation of ouabain transport in these animals. However, adult rats fed 100 ppm PBBs for two weeks had significantly lower plasma concentrations of sulfobromophthalein (BSP) and increased biliary excretion of BSP, when compared to controls. PBBs-fed adult rats also excreted a greater percentage conjugated BSP (BSP-GSH) into bile. Two week dietary treatment of 100, 150, and 200 ppm PBBs resulted in enhanced initial disappearance of indocyanine green (ICG) from plasma of adult mice. However, dietary doses of 100 and 200 ppm PBBs to adult mice was not associated with enhanced capacity for ouabain excretion. In contrast, treatment with PBBs through the mother's diet (50 ppm) resulted in an almost twofold increase in cumulative ouabain excretion in 15-day-old mice. The results suggest that PBBs stimulate hepatic drug elimination in rats and mice, but the magnitude of the effect is dependent on age and transported compound.

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Selected References

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