TY - JOUR
T1 - Reduced T helper 1 responses in IL-12 p40 transgenic mice
AU - Yoshimoto, Takayuki
AU - Wang, Chrong Reen
AU - Yoneto, Toshihiko
AU - Waki, Seiji
AU - Sunaga, Shinji
AU - Komagata, Yoshinori
AU - Mitsuyama, Masao
AU - Miyazaki, Jun Ichi
AU - Nariuchi, Hideo
PY - 1998/1/15
Y1 - 1998/1/15
N2 - 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-γ 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-γ 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.
AB - 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-γ 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-γ 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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M3 - Article
C2 - 9551892
AN - SCOPUS:0031964713
VL - 160
SP - 588
EP - 594
JO - Journal of Immunology
JF - Journal of Immunology
SN - 0022-1767
IS - 2
ER -