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From the * Department of Immunology, DNAX Research Institute of Molecular and Cellular Biology,
Palo Alto, California 94304; We have used interleukin-10 (IL-10) gene knockout mice (IL-10
Department of Medicine, University of California, San Francisco,
California 94110; § Schering-Plough Research Institute, Lafayette, New Jersey 07848; and the
Department of Medicine, Allergy Immunology Division, Medical College of Wisconsin and Research
Service, Veterans' Administration Medical Center, Milwaukee, Wisconsin 53295
/
) to examine the role of
endogenous IL-10 in allergic lung responses to Aspergillus fumigatus Ag. In vitro restimulated
lung cells from sensitized IL-10
/
mice produced exaggerated amounts of IL-4, IL-5, and interferon-
(IFN-
) compared with wild-type (WT) lung cells. In vivo, the significance of IL-10
in regulating responses to repeated A. fumigatus inhalation was strikingly revealed in IL-10
/
outbred mice that had a 50-60% mortality rate, while mortality was rare in similarly treated
WT mice. Furthermore, IL-10
/
outbred mice exhibited exaggerated airway inflammation
and heightened levels of IL-5 and IFN-
in bronchoalveolar lavage (BAL) fluids. In contrast,
the magnitude of the allergic lung response was similar in intranasally (i.n.) sensitized IL-10
/
and wild-type mice from a different strain (C57BL/6). Using a different route of priming (intraperitoneal) followed by one i.n. challenge we found that IL-10
/
C57BL/6 mice had
heightened eosinophilic airway inflammation, BAL-IL-5 levels, and numbers of 
T cells in
the lung tissues compared with WT mice. We conclude that IL-10 can suppress inflammatory Th2-like lung responses as well as Th1-like responses given the constraints of genetic background and route of priming.
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