Differential regulation of virus-specific T-cell effector functions following activation by peptide or innate cytokines.
Robust CD8(+) T-cell activation is vital for the recovery from many viral infections and is orchestrated via the integration of signals delivered through surface molecules, including the T-cell antigen receptors (TcRs) and cytokine receptors. Little is known about how virus-specific T cells interpret sequential or combined stimulation through these receptors, which must undoubtedly occur in vivo during antiviral immune responses. When measured in real time, peptide antigen and the cytokines, interleukin 12 (IL-12) and IL-18, independently regulate the on/off kinetics of protective (interferon gamma, tumor necrosis factor alpha) and immunomodulatory (IL-2, CD40L) cytokine production by activated T cells and memory T cells. The remarkable differences in effector functions elicited by innate or adaptive signals (IL-12/ IL-18 or peptide, respectively) illustrate the complex and stringent regulation of cytokine expression by CD8(+) T cells. Together, these results indicate how antiviral T cells incorporate multiple signals from their local microenvironment and tailor their cytokine responses accordingly.
Vaccine and Gene Therapy Institute, Oregon Health and Science University, 505 NW 185th Ave, Beaverton, OR 97006, USA.
Carol
C
Beadling
Mark K
MK
Slifka
D000818:Animals; D016207:Cytokines / Q000494:pharmacology*; D005434:Flow Cytometry; D005786:Gene Expression Regulation / Q000276:immunology; D007371:Interferon-gamma / Q000096:biosynthesis; D007375:Interleukin-1 / Q000494:pharmacology; D020382:Interleukin-18 / Q000494:pharmacology; D008213:Lymphocyte Activation / Q000187:drug effects; D051379:Mice; D008807:Mice, Inbred BALB C; D010455:Peptides / Q000494:pharmacology*; D011948:Receptors, Antigen, T-Cell / Q000276:immunology; D013154:Spleen / Q000276:immunology; D013601:T-Lymphocytes / Q000187:drug effects / Q000276:immunology* / Q000821:virology*; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics
D016207:Cytokines; D007375:Interleukin-1; D020382:Interleukin-18; D010455:Peptides; D011948:Receptors, Antigen, T-Cell; D014409:Tumor Necrosis Factor-alpha; D007371:Interferon-gamma