Suppression of Th2 cytokines as a potential mechanism for reduced antibody response following PFOA exposure in female B6C3F1 mice. (15th October 2021)

• Record Type: Journal Article
• Authors: De Guise, Sylvain; Levin, Milton
• Is Part Of: Toxicology letters. Volume 351(2021)
• Page Start: 155
• Page End: 162
• Publication Date: 2021-10-15
• Subjects: PFOA -- Immunotoxicity -- Cytokines -- Th2 -- TDAR -- Total accumulated dose; Toxicology -- Periodicals; 363.179
• DOI: 10.1016/j.toxlet.2021.09.002
• Languages: English
• ISSNs: 0378-4274

Abstract

Graphical abstract: Highlights: Long-term PFOA exposure reduced IgM response at lower doses than previous reports. PFOA altered Th1/Th2 and pro-inflammatory cytokines following KLH stimulation. Lower Th2 cytokines could explain the reduced IgM response. Data suggest a potential role for T helper cells in the toxicity of PFOA. Abstract: Perfluorooctanoic acid (PFOA), a member of the Per- and polyfluoroalkyl substances, is a highly persistent "forever" chemicals with increasing concern for its potential health effects. However, the mechanisms of PFOA immunotoxic effects are poorly understood. We assessed the antibody response to a physiological antigen stimulation and associated cytokine response upon PFOA exposure. The significant decrease in the IgM antibody response to the T cell dependent antigen keyhole limpet hemocyanin (KLH) at a dose lower than the previously documented LOAEL was accompanied by a significant reduction of the Th2 serum cytokines IL-5 and IL-13, a non-significant dose-response reduction of IL-4, a significant reduction of the Th1 cytokine IL-12, and a non-significant dose-response increase in IL-2 and IFNγ. PFOA significantly decreased the pro-inflammatory cytokines IL-17α and IL-1α, decreased (non-significantly but dose-response) IL-6, and a significantly increased TNFα. Overall, the modulation of serum Th1/Th2 cytokines could explain the reduction in antibody response, pointing to a potential role for T helper cells in the immunotoxicity of PFOA. Further, the higher than anticipated weight loss and increased liver weight, compared to previous studies using similar doses, highlight the potential importance of the route and duration of exposure, contributing to the total accumulated dose, in assessing the toxicity of PFOA.