RESUMO
Pathological examination is the gold standard for cancer diagnosis, and breast tumor cells are often found in clusters. We report a case study on one triple-negative breast cancer (TNBC) patient, analyzing tumor development, metastasis, and prognosis with simultaneous DNA and RNA sequencing of pathologist-defined cell clusters from multiregional frozen sections. The cell clusters are isolated by laser capture microdissection (LCM) from primary tumor tissue, lymphatic vessels, and axillary lymph nodes. Data are reported for a total of 97 cell clusters. A combination of tumor cell-cluster clonality and phylogeny reveals 3 evolutionarily distinct pathways for this patient, each associated with a unique mRNA signature, and each correlated with disparate survival outcomes. Hub gene analysis indicates that extensive downregulation of ribosomal protein mRNA is a potential marker of poor prognosis in breast cancer.
Assuntos
Linhagem da Célula/genética , DNA de Neoplasias/genética , Genoma Humano , RNA Neoplásico/genética , Neoplasias de Mama Triplo Negativas/diagnóstico , Neoplasias de Mama Triplo Negativas/genética , Agregação Celular/genética , Células Clonais , DNA de Neoplasias/metabolismo , Progressão da Doença , Células Epiteliais/classificação , Células Epiteliais/metabolismo , Células Epiteliais/patologia , Evolução Fatal , Feminino , Regulação Neoplásica da Expressão Gênica , Sequenciamento de Nucleotídeos em Larga Escala , Humanos , Linfonodos/metabolismo , Linfonodos/patologia , Metástase Linfática , Vasos Linfáticos/metabolismo , Vasos Linfáticos/patologia , Linfócitos/classificação , Linfócitos/metabolismo , Linfócitos/patologia , Filogenia , Prognóstico , RNA Neoplásico/metabolismo , Proteínas Ribossômicas/genética , Proteínas Ribossômicas/metabolismo , Neoplasias de Mama Triplo Negativas/metabolismo , Neoplasias de Mama Triplo Negativas/patologia , Adulto JovemRESUMO
Although the adaptive immune system has a remarkable ability to mount rapid recall responses to previously encountered pathogens, the cellular and molecular signals necessary for memory CD8(+) T cell reactivation are poorly defined. IL-15 plays a critical role in memory CD8(+) T cell survival; however, whether IL-15 is also involved in memory CD8(+) T cell reactivation is presently unclear. Using artificial Ag-presenting surfaces prepared on cell-sized microspheres, we specifically addressed the role of IL-15 transpresentation on mouse CD8(+) T cell activation in the complete absence of additional stimulatory signals. In this study we demonstrate that transpresented IL-15 is significantly more effective than soluble IL-15 in augmenting anti-CD3epsilon-induced proliferation and effector molecule expression by CD8(+) T cells. Importantly, IL-15 transpresentation and TCR ligation by anti-CD3epsilon or peptide MHC complexes exhibited synergism in stimulating CD8(+) T cell responses. In agreement with previous studies, we found that transpresented IL-15 preferentially stimulated memory phenotype CD8(+) T cells; however, in pursuing this further, we found that central memory (T(CM)) and effector memory (T(EM)) CD8(+) T cells responded differentially to transpresented IL-15. T(CM) CD8(+) T cells undergo Ag-independent proliferation in response to transpresented IL-15 alone, whereas T(EM) CD8(+) T cells are relatively unresponsive to transpresented IL-15. Furthermore, upon Ag-specific stimulation, T(CM) CD8(+) T cell responses are enhanced by IL-15 transpresentation, whereas T(EM) CD8(+) T cell responses are only slightly affected, both in vitro and in vivo. Thus, our findings distinguish the role of IL-15 transpresentation in the stimulation of distinct memory CD8(+) T cell subsets, and they also have implications for ex vivo reactivation and expansion of Ag-experienced CD8(+) T cells for immunotherapeutic approaches.