ToxSci Advance Access originally published online on March 15, 2007
Toxicological Sciences 2007 97(2):375-383; doi:10.1093/toxsci/kfm053
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Published by Oxford University Press 2007.
Exposure to the Immunosuppresant, Perfluorooctanoic Acid, Enhances the Murine IgE and Airway Hyperreactivity Response to Ovalbumin
* National Institute for Occupational Safety and Health, Morgantown, West Virginia 26505
Baldur Toxicology, N7659 950th Street, River Falls, Wisconsin 54022
1 To whom correspondence should be addressed at 1095 Willowdale Road, MS 4020, Morgantown, WV 26505. E-mail: bhm8{at}cdc.gov.
Received January 18, 2007; accepted March 8, 2007
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Abstract |
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These studies were conducted to investigate the role of dermal exposure to perfluorooctanoic acid (PFOA), a known immunosuppressant, on the hypersensitivity response to ovalbumin (OVA) in a murine model of asthma. PFOA has had widespread use as a carpet and fabric protectant. BALB/c mice were exposed dermally, on the dorsal surface of each ear, to concentrations of PFOA ranging from 0.01 to 1.5% (applied dose 0.25–50 mg/kg) for 4 days. In hypersensitivity studies, mice were also ip injected with 7.5 µg OVA and 2 mg alum on days 1 and 10 and in some studies challenged with 250 µg OVA by pharyngeal aspiration on days 17 and 26. Following exposure to PFOA, an increase in liver weights and a decrease in thymus and spleen weights and cellularities were observed. Similar immunomodulatory trends were demonstrated in mice coadministered PFOA and OVA. Compared to the OVA alone–exposed animals, an increase in total IgE was demonstrated when mice were coexposed to OVA and concentrations of PFOA ranging from 0.75 to 1.5%, while the OVA-specific IgE response peaked with 0.75% PFOA coexposure (p 
0.05). OVA-specific airway hyperreactivity was increased in the 1.0% PFOA coexposed group (p 0.05), with an increased pleiotropic cell response characterized by eosinophilia and mucin production, in animals coexposed to concentrations of PFOA up to 1.0%, as compared to the OVA alone–exposed animals. In a murine model, PFOA was demonstrated to be immunotoxic following dermal exposure, with an enhancement of the hypersensitivity response to OVA, suggesting that PFOA exposure may augment the IgE response to environmental allergens.
Key Words: perfluorooctanoic acid; ovalbumin; airway hyperreactivity; IgE.
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