| Autor: |
Eduardo Davila, Jovanny Zabaleta, Ratika Srivastava, Ann Mary Joseph |
| Rok vydání: |
2023 |
| DOI: |
10.1158/2326-6066.c.6548659.v1 |
| Popis: |
The activation of TLR-MyD88 (Toll-like receptor-myeloid differentiation factor 88) signaling within T cells functions as a potent costimulatory signal that boosts antitumor and antiviral responses. However, the molecular mechanisms underlying the costimulatory processes are poorly understood. We compared microarray gene analysis data between TLR1–TLR2-stimulated and unstimulated T-cell receptor transgenic “pmel” and MyD88−/− pmel CD8+ T cells and identified changes in the expression of several TNF family members. In particular, TLR stimulation increased 4-1BB levels in pmel but not in MyD88−/−pmel T cells. A link between 4-1BB and TLR1–TLR2 signaling in CD8+ T cells was highlighted by the suboptimal responses of 4-1BB−/− T cells to TLR1–TLR2 agonist, but their normal response to CD28 or OX40 costimulation. Blocking 4-1BB signaling with antibodies also hindered the costimulatory effects of the TLR1–TLR2 agonist. The elevated levels of 4-1BB transcripts in TLR1–TLR2-stimulated cells were not due to increased mRNA stability nor increased histone activation, but instead were associated with increased binding of p65 and c-Jun to two distinct 4-1BB promoter sites. Combining TLR1–TLR2 ligand with an agonistic antibody to 4-1BB enhanced the antitumor activity in mice with established melanoma tumors. These studies reveal that the costimulatory effects of TLR1–TLR2 signaling in CD8+ T cells are in part mediated by 4-1BB and are important for mounting an effective antitumor immune response. Cancer Immunol Res; 4(8); 708–16. ©2016 AACR. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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