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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Modulation of the induction of lung and airway allergy in the offspring of IFN-gamma-treated mother mice.
Journal of Immunology 2005 September 16
Recent studies have highlighted the influence of fetal/maternal interactions on the development of asthma. Because IFN-gamma reduces Th2-mediated allergic responses, we assessed its capacity to modulate asthma in the offspring when injected into mothers during pregnancy. IFN-gamma was injected in CD1 female mice on day 6.5 of gestation. Immediately after birth, male newborns were housed in cages with interchanged mothers: the offspring from IFN-gamma-treated mothers were breastfed by normal mothers (IFN/nor), and those from normal mothers were breastfed by IFN-gamma-treated (Nor/IFN) or normal mothers (Nor/nor). Immediately after weaning, the spleen cells from IFN/nor and Nor/IFN mice produced less IL-4 and more IFN-gamma than Nor/nor mice when stimulated with Con A. At the age of 6-7 wk, mice were immunized with OVA on days 0 and 7. From day 14 to 16, they were exposed to aerosolized OVA. The bronchoalveolar lavage fluid from Nor/nor mice showed eosinophilia, a large number of these cells being present in perivascular and peribronchial regions of lung tissues. IFN/nor or Nor/IFN mice showed greatly reduced eosinophil numbers in bronchoalveolar lavage fluid. In addition, lung sections from IFN/nor, but not Nor/IFN mice showed almost normal histology. In OVA-sensitized IFN/nor and Nor/IFN mice, the production of IFN-gamma, IL-4, and IL-5 by spleen cells was significantly reduced as compared with cells from the OVA-sensitized Nor/nor group. IgE and anaphylactic IgG1 were also reduced in plasma of IFN/nor mice. In conclusion, the presence of IFN-gamma during pregnancy confers to the fetus a protection against allergenic provocations in the adult life.
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