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*
Department of Allergology, Institute of Medical Science, The University of Tokyo, Tokyo, Japan;
Gunma Prefectural College of Health Sciences, Maebashi, Japan;
Department of Molecular Embryology, Institute of Development, Aging and Cancer, Tohoku University, Sendai, Japan; and
§
Department of Bacteriology, School of Medicine, Niigata University, Niigata, Japan
To investigate the antagonistic effect of IL-12 p40 on IL-12
activity in vivo, we generated transgenic (Tg) mice in which p40 gene
was regulated by a liver-specific promoter. Three Tg mouse lines were
generated, and they expressed the p40 transgene predominantly in liver.
Serum p40 level was extremely high, and it consisted of mainly monomer
and homodimer and also of higher m.w. complexes. These Tg mice did not
show any apparent phenotypic difference from control littermates in
lymphoid cells. Enhancement of NK cell lytic activity in spleen by
administration of rIL-12 to these mice was greatly diminished.
Ag-induced cytokine production was impaired: decreased production of
IFN-
and increased production of IL-4 and IL-10. Delayed-type
hypersensitivity response was also significantly reduced. Moreover,
these Tg mice showed increased susceptibility to the infection with an
intracellular pathogen, blood-stage Plasmodium berghei XAT,
which is an irradiation-induced attenuated substrain of P.
berghei NK65, presumably due to the decreased IFN- production.
These results suggest that p40 functions as an IL-12 antagonist in
vivo, and that Th1 responses in p40 Tg mice are significantly reduced.
Thus, these Tg mice could be a useful model to evaluate the inhibitory
effect of p40 on IL-12-mediated various immune responses in vivo.
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