RESUMO
We had previously demonstrated the role of CD103 integrin on lung tumor-infiltrating lymphocyte (TIL) clones in promoting specific TCR-mediated epithelial tumor cell cytotoxicity. However, the contribution of CD103 on intratumoral T cell distribution and functions and the prognosis significance of TIL subpopulations in non-small cell lung carcinoma (NSCLC) have thus far not been systematically addressed. In this study, we show that an enhanced CD103(+) TIL subset correlates with improved early stage NSCLC patient survival and increased intraepithelial lymphocyte infiltration. Moreover, our results indicate that CD8(+)CD103(+) TIL, freshly isolated from NSCLC specimens, display transcriptomic and phenotypic signatures characteristic of tissue-resident memory T cells and frequently express PD-1 and Tim-3 checkpoint receptors. This TIL subset also displays increased activation-induced cell death and mediates specific cytolytic activity toward autologous tumor cells upon blockade of the PD-1-PD-L1 interaction. These findings emphasize the role of CD8(+)CD103(+) tissue-resident memory T cells in promoting intratumoral CTL responses and support the rationale for using anti-PD-1 blocking Ab to reverse tumor-induced T cell exhaustion in NSCLC patients.
Assuntos
Memória Imunológica , Neoplasias Pulmonares/imunologia , Neoplasias Pulmonares/mortalidade , Linfócitos do Interstício Tumoral/imunologia , Idoso , Idoso de 80 Anos ou mais , Antígenos CD/metabolismo , Antígenos CD8/metabolismo , Carcinoma Pulmonar de Células não Pequenas/imunologia , Carcinoma Pulmonar de Células não Pequenas/mortalidade , Carcinoma Pulmonar de Células não Pequenas/patologia , Citotoxicidade Imunológica , Feminino , Perfilação da Expressão Gênica , Receptor Celular 2 do Vírus da Hepatite A , Humanos , Imunofenotipagem , Cadeias alfa de Integrinas/metabolismo , Neoplasias Pulmonares/patologia , Ativação Linfocitária/imunologia , Linfócitos do Interstício Tumoral/metabolismo , Masculino , Proteínas de Membrana/genética , Proteínas de Membrana/metabolismo , Pessoa de Meia-Idade , Estadiamento de Neoplasias , Especificidade de Órgãos/imunologia , Prognóstico , Receptor de Morte Celular Programada 1/genética , Receptor de Morte Celular Programada 1/metabolismo , Fatores de RiscoRESUMO
Tumours often evade CD8 T-cell immunity by downregulating TAP. T-cell epitopes associated with impaired peptide processing are immunogenic non-mutated neoantigens that emerge during tumour immune evasion. The preprocalcitonin (ppCT)16-25 neoepitope belongs to this category of antigens. Here we show that most human lung tumours display altered expression of TAP and frequently express ppCT self-antigen. We also show that ppCT includes HLA-A2-restricted epitopes that are processed by TAP-independent and -dependent pathways. Processing occurs in either the endoplasmic reticulum, by signal peptidase and signal peptide peptidase, or in the cytosol after release of a signal peptide precursor or retrotranslocation of a procalcitonin substrate by endoplasmic-reticulum-associated degradation. Remarkably, ppCT peptide-based immunotherapy induces efficient T-cell responses toward antigen processing and presenting machinery-impaired tumours transplanted into HLA-A*0201-transgenic mice and in NOD-scid-Il2rγnull mice adoptively transferred with human PBMC. Thus, ppCT-specific T lymphocytes are promising effectors for treatment of tumours that have escaped immune recognition.