title: The specific NK cell response in concert with perforin prevents CD8(+) T cell-mediated immunopathology after mouse cytomegalovirus infection.
abstract: Natural killer (NK) and CD8(+) T cells play a crucial role in the control of mouse cytomegalovirus (MCMV) infection. These effector cells exert their functions by releasing antiviral cytokines and by cytolytic mechanisms including perforin activation. In addition to their role in virus control, NK cells play an immunoregulatory role since they shape the CD8(+) T cell response to MCMV. To investigate the role of perforin-dependent cytolytic mechanism in NK cell modulation of CD8(+) T cell response during acute MCMV infection, we have used perforin-deficient C57BL/6 mice (Prf1(-/-)) and have shown that virus control by CD8(+) T cells in Prf1(-/-) mice is more efficient if NK cells are activated by the engagement of the Ly49H receptor with the m157 MCMV protein. A lack of perforin results in severe liver inflammation after MCMV infection, which is characterized by immunopathological lesions that are more pronounced in Prf1(-/-) mice infected with virus unable to activate NK cells. This immunopathology is caused by an abundant infiltration of activated CD8(+) T cells. The depletion of CD8(+) T cells has markedly reduced pathohistological lesions in the liver and improved the survival of Prf1(-/-) mice in spite of an increased viral load. Altogether, the results of our study suggest that a lack of perforin and absence of the specific activation of NK cells during acute MCMV infection lead to an unleashed CD8(+) T cell response that is detrimental for the host.
authors: Department of Histology and Embryology, Faculty of Medicine, University of Rijeka, Braće Branchetta 20, Rijeka, Croatia.
authors: Jurica
authors: J
authors: Arapović
authors: Maja
authors: M
authors: Arapović
authors: Mijo
authors: M
authors: Golemac
authors: Luka
authors: L
authors: Traven
authors: Jelena
authors: J
authors: Tomac
authors: Dijana
authors: D
authors: Rumora
authors: Edvard
authors: E
authors: Ražić
authors: Astrid
authors: A
authors: Krmpotić
authors: Stipan
authors: S
authors: Jonjić
mesh_terms: D000818:Animals; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology* / Q000378:metabolism*; D016207:Cytokines / Q000378:metabolism; D017353:Gene Deletion; D006566:Herpesviridae Infections / Q000276:immunology* / Q000401:mortality / Q000473:pathology / Q000821:virology*; D007694:Killer Cells, Natural / Q000276:immunology* / Q000378:metabolism*; D008099:Liver / Q000276:immunology / Q000473:pathology / Q000821:virology; D008213:Lymphocyte Activation / Q000276:immunology; D008212:Lymphocyte Depletion; D051379:Mice; D018345:Mice, Knockout; D018146:Muromegalovirus / Q000235:genetics / Q000276:immunology*; D009154:Mutation; D054353:Perforin / Q000172:deficiency / Q000235:genetics / Q000378:metabolism*; D037182:T-Cell Antigen Receptor Specificity / Q000235:genetics / Q000276:immunology; D016176:T-Lymphocyte Subsets / Q000276:immunology / Q000378:metabolism; D019562:Viral Load
chemical_list: D016207:Cytokines; D054353:Perforin