title: Chronic effects of perfluorooctanesulfonate exposure on immunotoxicity in adult male C57BL/6 mice.
abstract: A paucity of data exists to corroborate the few studies that report immune suppression after exposure to perfluorooctanesulfonate (PFOS). In this study, adult male C57BL/6 mice were exposed to PFOS daily via gavage for 60 days [0, 0.5, 5, 25, 50, or 125 mg/kg total administered dose (TAD)]. The results showed that liver mass was significantly increased at > or =5 mg PFOS/kg TAD and in a dose-dependent manner. Lymphocyte proliferation and natural killer cell activity were altered in male mice. Plaque forming cell (PFC) response was suppressed beginning at 5 mg/kg TAD. Based on the liver mass and PFC response, the no observed adverse effect level and lowest observed adverse effect level for male mice exposed PFOS for 60 days was 0.5 and 5 mg/kg TAD, respectively. Measured PFOS serum concentrations at these dose levels were 0.674 +/- 0.166 and 7.132 +/- 1.039 mg/l, respectively. These results indicate that PFOS exposure can affect the immunity function in mice at levels approximately 50-fold for highly exposed human populations.
authors.affiliation: China Medical University, Heping Districts, Shenyang, People's Republic of China. ghdong@mail.cmu.edu.cn
authors.forename: Guang-Hui
authors.initials: GH
authors.lastname: Dong
authors.forename: Ying-Hua
authors.initials: YH
authors.lastname: Zhang
authors.forename: Li
authors.initials: L
authors.lastname: Zheng
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.forename: Yi-He
authors.initials: YH
authors.lastname: Jin
authors.forename: Qin-Cheng
authors.initials: QC
authors.lastname: He