Abstract |
Previous observations that the highly conserved poxvirus-encoded serpins inhibit cytotoxic activities of alloreactive CTL via granule and/or Fas-mediated pathways was taken to indicate their involvement in immune evasion by poxviruses. We now show that interference with 51Cr release from target cells by ectromelia and cowpoxvirus is limited to alloreactive but not MHC-restricted CTL. The data are in support of the paramount importance of CTL and its effector molecule perforin in the recovery from primary ectromelia virus infection and question the role of serpins in the evasion of poxviruses from killing by CTL. Further analysis of poxvirus interference with target cell lysis by alloreactive CTL revealed that suppression primarily affects the Fas-mediated, and to a lesser extent, the granule exocytosis pathway. Serpin-2 is the main contributor to suppression for both killing pathways. In addition, inhibition of lysis was shown to be both target cell type- and MHC allotype-dependent. We hypothesize that differences in TCR affinities and/or state of activation between alloreactive and MHC-restricted CTL as well as the quality (origin) of target cells are responsible for the observed phenomenon.
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Authors | A Müllbacher, R Wallich, R W Moyer, M M Simon |
Journal | Journal of immunology (Baltimore, Md. : 1950)
(J Immunol)
Vol. 162
Issue 12
Pg. 7315-21
(Jun 15 1999)
ISSN: 0022-1767 [Print] United States |
PMID | 10358181
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- H-2 Antigens
- Immunosuppressive Agents
- Serpins
- fas Receptor
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Topics |
- Animals
- Cell Death
(immunology)
- Cell Line
- Cell Membrane
(immunology, metabolism, virology)
- Cytoplasmic Granules
(immunology, virology)
- Cytotoxicity, Immunologic
(genetics, immunology)
- Exocytosis
(immunology)
- Female
- H-2 Antigens
(biosynthesis, genetics, immunology)
- Immunity, Innate
- Immunosuppressive Agents
(pharmacology)
- Mice
- Mice, Inbred BALB C
- Mice, Inbred C3H
- Mice, Inbred C57BL
- Mice, Inbred CBA
- Mice, Knockout
- Poxviridae
(genetics, immunology)
- Poxviridae Infections
(enzymology, immunology)
- Serpins
(genetics, physiology)
- T-Lymphocyte Subsets
(immunology)
- T-Lymphocytes, Cytotoxic
(enzymology, immunology, virology)
- fas Receptor
(physiology)
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