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Journal Article
Research Support, Non-U.S. Gov't
Immunological tolerance to LCMV antigens differently affects control of acute and chronic virus infection in mice.
European Journal of Immunology 2018 January
Cytotoxic T lymphocytes (CTLs) play a key role in the control of lymphocytic choriomeningitis virus (LCMV) infection. In C57BL/6 mice (H-2b ), the CTL response is mainly directed against epitopes from the LCMV glycoprotein (GP) and the nucleoprotein (NP) which represent the two major viral proteins. The role of GP- versus NP-derived epitopes for viral clearance was examined using transgenic (tg) mice ubiquitously expressing LCMV GP and NP, respectively. These mice lack GP- or NP-specific CTLs and show decreased levels of GP- or NP-specific antibodies as a result of tolerance induction. During acute LCMV infection, CTLs specific for GP- and NP-derived epitopes are generated with similar frequencies. Nonetheless, we found that lack of GP- but not of NP-specific CTLs abolished control of acute LCMV infection. In contrast, after high-dose or chronic LCMV infection, virus elimination was delayed to a similar extent in GP- and NP-tg mice. Thus, immunological tolerance to LCMV antigens differently affects virus clearance in acute and chronic infection settings. In addition, our data reveal that immunodominance of H-2b -restricted LCMV-specific CTL epitopes and their antiviral activity do not strictly correlate.
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