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Core Research for Evolutional Science and Technology, Japan Science and Technology Corp., and
Department of Molecular Behavioral Biology, Osaka Bioscience Institute, Suita, Osaka, Japan
PGD2 is a major lipid mediator released from mast
cells, but little is known about its role in the development of
allergic reactions. We used transgenic (TG) mice overexpressing human
lipocalin-type PGD synthase to examine the effect of overproduction of
PGD2 in an OVA-induced murine asthma model. The
sensitization of wild-type (WT) and TG mice was similar as judged by
the content of OVA-specific IgE. After OVA challenge, PGD2,
but not PGE2, substantially increased in the lungs of WT
and TG mice with greater PGD2 increment in TG mice compared
with WT mice. The numbers of eosinophils and lymphocytes in the
bronchoalveolar lavage (BAL) fluid were significantly greater in TG
mice than in WT mice on days 1 and 3 post-OVA challenge, whereas the
numbers of macrophages and neutrophils were the same in both WT and TG
mice. The levels of IL-4, IL-5, and eotaxin in BAL fluid were also
significantly higher in TG mice than in WT mice, although the level of
IFN-
in the BAL fluid of TG mice was decreased compared with that in
WT mice. Furthermore, lymphocytes isolated from the lungs of TG mice
secreted less IFN-
than those from WT mice, whereas IL-4 production
was unchanged between WT and TG mice. Thus, overproduction of
PGD2 caused an increase in the levels of Th2 cytokines and
a chemokine, accompanied by the enhanced accumulation of eosinophils
and lymphocytes in the lung. These results indicate that
PGD2 plays an important role in late phase allergic
reactions in the pathophysiology of bronchial
asthma.
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