Protective roles of T cells and interleukin-15 in Escherichia coli infection in mice

M. Takano, H. Nishimura, Y. Kimura, Y. Mokuno, J. Washizu, S. Itohara, Y. Nimura, Y. Yoshikai

研究成果: ジャーナルへの寄稿学術誌査読

72 被引用数 (Scopus)


The number of γδ T cells in the peritoneal cavity was increased after an intraperitoneal (i.p.) infection with Escherichia coil in lipopolysaccharide (LPS)-responsive C3H/HeN mice but not in LPS- hyporesponsive C3H/HeJ mice. The γδ T cells preferentially expressed invariant Vγ6 and Vδ1 chains and proliferated to produce a large amount of gamma interferon in the presence of LPS. Mice depleted of γδ T cells by T- cell receptor δ gene mutation showed impaired resistance against E. coil as assessed by bacterial growth. Macrophages from C3H/HeN mice infected with E. coli expressed higher levels of interleukin-15 (IL-15) mRNA than those from the infected C3H/HeJ mice. Administration of anti-IL-15 monoclonal antibody inhibited, albeit partially, the appearance of γδ T cells in C3H/HeN mice after E. coli infection and diminished the host defense against the infection. These results suggest that LPS-stimulated γδ T cells play an important role in the host defense against E. coil infection and that IL-15 may be partly involved in the protection via an increase in the γδ T cells.

ジャーナルInfection and Immunity
出版ステータス出版済み - 7月 1998

!!!All Science Journal Classification (ASJC) codes

  • 寄生虫科
  • 微生物学
  • 免疫学
  • 感染症


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