Abstract:
:The in-vivo clearance of Bordetella pertussis infections in murine models in naive mice and animals vaccinated with whole-cell vaccine is considered to be via a Th-1-dependent mechanism in which interleukin-12 (IL)-12 may play a prominent role. It has also been demonstrated clearly that the treatment of animals with macrophage-derived IL-12 administered with an acellular vaccine can increase the efficacy of this vaccine preparation to levels seen with the whole-cell vaccine. However, the effects of exogenously added IL-12 on immune responses in non-vaccinated B. pertussis-challenged mice remain unclear, with two studies giving contradictory findings. In this study we have treated mice with escalating doses of mIL-12 (0.1-10 microg/mouse) prior to challenge with B. pertussis (using an aerosol challenge model of infection). The ability of mice to clear infection was assessed in IL-12 treated and in phosphate buffered saline (PBS) control animals at days 6 and 13 post-challenge. Lymphoid cells were isolated from spleen and cell-mediated immune responses assessed at days 1, 6 and 13 post-challenge. In addition, the direct effects of high-dose IL-12 on challenged mice was assessed by checking natural killer (NK) activity from isolated lung and spleen lymphoid cells as well as interferon-gamma (IFN-gamma) generation from isolated cells and serum at day 1 post-challenge. The results from this study show that bacterial colonization of the lungs is actually enhanced following treatment with high-dose IL-12. This is associated with impaired cellular immune responses. The mechanisms associated with the immunosuppressive effects of IL-12 are discussed.
journal_name
Clin Exp Immunoljournal_title
Clinical and experimental immunologyauthors
Carter CR,Dagg BM,Whitmore KM,Keeble JR,Asokanathan C,Xing D,Walker KBdoi
10.1111/j.1365-2249.2003.02352.xsubject
Has Abstractpub_date
2004-02-01 00:00:00pages
233-9issue
2eissn
0009-9104issn
1365-2249pii
2352journal_volume
135pub_type
杂志文章abstract::A technique is described which shows how to obtain a suspension of only progressively motile spermatozoa, from semen, by active penetration into an overlying buffer layer. About 60% of the number of motile spermatozoa in the original semen sample can be obtained as an output in the removed buffer layer. With this meth...
journal_title:Clinical and experimental immunology
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journal_title:Clinical and experimental immunology
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journal_title:Clinical and experimental immunology
pub_type: 杂志文章
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journal_title:Clinical and experimental immunology
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doi:
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journal_title:Clinical and experimental immunology
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