期刊
MICROBES AND INFECTION
卷 12, 期 2, 页码 126-134出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micinf.2009.11.003
关键词
Tularemia; iglC; Cell death
资金
- NIH, Public Health Service [R01AI43965, R01AI069321]
- Kentucky Research Challenge Trust
- Ministry of Science Educatuion and Sports Republic of Croatia [062-0621273-0950]
Francisella tularensis induces apoptosis within macrophages but the temporal and spatial modulation through activation of caspase-1, caspase-3, and the anti-apoptosis nuclear transcription factor B (NF-kappa B) is not known. Whether escape of the bacteria into the cytosol is sufficient and/or essential for activation of NF-kappa B is not known. Our results show that F. tularensis subsp. novicida induces sustained nuclear translocation of NF-kappa B at early time points after infection of human monocytes derived macrophages (hMDMs). The sustained nuclear translocation of NF-kappa B is defective in the iglC mutant that fails to escape into the cytosol of macrophages. Nuclear translocation of NF-kappa B by the wild type strain is abolished upon treatment with the NF-kappa B inhibitor caffein acid phenyl ester. While the wild type strain triggers caspase-3 and caspase-1 activation by 6 h post-infection the iglC mutant is defective in triggering both caspases. In hMDMs treated with the apoptosis-inducing agent, staurosporin, there is an induction of cell death in the iglC mutant-infected macrophages despite reduced frequency of caspase-1 and caspase-3 activity. The wt-infected macrophages are resistant to cell death-induced agent. We conclude that although caspase-1 and capsase-3 are triggered within F. tularensis-infected hMDMs during early stages of infection, cell death is delayed, which is correlated with simultaneous activation of NF-kappa B. (C) 2009 Elsevier Masson SAS. All rights reserved.
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