Similar Datasets
Project description:Microbes are an integral component of the tumor microenvironment (TME). However, mechanisms that direct microbial recruitment into tumors and the spatial relationship between intratumoral microbes and host cells remain poorly understood. Here, we show that microbes and immune cells have parallel spatial distribution and that the presence of intratumoral microbes is dependent on T cells. Analysis of human pancreatic ductal adenocarcinomas (PDAC) and lung adenocarcinomas (LUAD) revealed a spatially heterogeneous distribution of lipopolysaccharide (LPS) that is associated with T cell infiltration. Using mouse models of PDAC, we found that microbes were more abundant and diverse in tumors that were enriched in T cells compared to tumors that lacked T cells, despite no significant differences in the fecal microbiome. Consistent with these findings, we detected elevated levels of microbial genes in T cell-enriched tumor nests in human PDAC. Compared to microbe-poor tumor nests, microbe-enriched tumor nests displayed a higher number of myeloid cells, B cells, and plasma cells. Microbe-enriched tumor nests also showed upregulation of immune-related processes, including responses to bacteria, and receptors that mediate mucosal immune responses to microbes. Administration of antibiotics to tumor-bearing mice altered the phenotype and presence of intratumoral myeloid cells and B cells but did not alter T cell infiltration. In contrast, depletion of T cells reduced the presence of intratumoral microbes. Our results identify a novel coupling between microbes and the intratumoral immune landscape, with T cells shaping microbial presence and subsequent microbial-host interactions.
2023-12-01 | GSE213736 | GEO
Project description:Solid tumors are composed of cancer cells and host immune cells that are distributed in a non-uniform pattern. Although this spatial heterogeneity may reflect mutational variations in cancer cells, mechanisms that direct the recruitment of immune cells to distinct regions within a tumor remain poorly understood. Here, we show that microbial-host interactions define tumor nests enriched in immune cells, and the distribution of microbes within tumors parallels the spatial heterogeneity of intratumoral lymphoid and myeloid cell populations. Analysis of human solid tumors revealed that the spatial distribution of immune cells, particularly CD8+ T cells, is markedly heterogeneous. Compared to T cell-poor (“cold”) tumor nests, T cell-rich (“hot”) tumor nests displayed a significantly higher number of myeloid cells, B cells, and plasma cells. We performed laser capture microdissection (LCM) followed by RNA sequencing to identify unique gene signatures that define tumor epithelium and stroma of cold and hot tumor nests. Cold tumor nests expressed genes that promote tumor proliferation and fibrosis, whereas hot tumor stroma and epithelium showed upregulation of immune-related processes, including responses to bacteria, and receptors that mediate mucosal immune responses to microbes, respectively. Consistent with these findings, we detected elevated levels of microbes within hot tumor nests in human pancreatic and lung cancers. Our data implicate host immune responses to microbes in defining intratumoral immune heterogeneity and highlight a potential role for crosstalks between microbes, cancer cells, and the host immune system in regulating cancer immunogenicity.
2023-12-01 | GSE155723 | GEO
Project description:Solid tumors are composed of cancer cells and host immune cells that are distributed in a non-uniform pattern. Although this spatial heterogeneity may reflect mutational variations in cancer cells, mechanisms that direct the recruitment of immune cells to distinct regions within a tumor remain poorly understood. Here, we show that microbial-host interactions define tumor nests enriched in immune cells, and the distribution of microbes within tumors parallels the spatial heterogeneity of intratumoral lymphoid and myeloid cell populations. Analysis of human solid tumors revealed that the spatial distribution of immune cells, particularly CD8+ T cells, is markedly heterogeneous. Compared to T cell-poor (“cold”) tumor nests, T cell-rich (“hot”) tumor nests displayed a significantly higher number of myeloid cells, B cells, and plasma cells. We performed laser capture microdissection (LCM) followed by RNA sequencing to identify unique gene signatures that define tumor epithelium and stroma of cold and hot tumor nests. Cold tumor nests expressed genes that promote tumor proliferation and fibrosis, whereas hot tumor stroma and epithelium showed upregulation of immune-related processes, including responses to bacteria, and receptors that mediate mucosal immune responses to microbes, respectively. Consistent with these findings, we detected elevated levels of microbes within hot tumor nests in human pancreatic and lung cancers. Our data implicate host immune responses to microbes in defining intratumoral immune heterogeneity and highlight a potential role for crosstalks between microbes, cancer cells, and the host immune system in regulating cancer immunogenicity.
2023-12-01 | GSE155722 | GEO
Project description:Solid tumors are composed of cancer cells and host immune cells that are distributed in a non-uniform pattern. Growing evidence shows that intratumoral microbes are associated with immune microenvironments in cancer. However, mechanisms that direct the recruitment of microbes to tumors remain poorly understood. Here, we show that intratumoral infiltration of immune cells and microbes are heterogeneous, and the distribution of microbes within tumors are orchestrated by the spatial heterogeneity of intratumoral lymphoid populations. Analysis of human solid tumors revealed that the spatial distribution of immune cells, particularly CD8+ T cells, is markedly heterogeneous. Compared to T cell-poor (“cold”) tumor nests, T cell-rich (“hot”) tumor nests displayed a significantly higher number of myeloid cells, B cells, and plasma cells. We performed laser capture microdissection (LCM) followed by RNA sequencing to identify unique gene signatures that define tumor epithelium and stroma of cold and hot tumor nests. Cold tumor nests expressed genes that promote tumor proliferation and fibrosis, whereas hot tumor stroma and epithelium showed upregulation of immune-related processes, including responses to bacteria, and receptors that mediate mucosal immune responses to microbes, respectively. Consistent with these findings, we detected elevated levels of microbes within hot tumor nests in human pancreatic and lung cancers as well as in mouse models of pancreatic cancer. Intratumoral T cell infiltration plays a causal role in spatial distribution of bacteria in tumor. Our data implicate intratumoral immune heterogeneity in defining microbial spatial distribution and highlight a potential role for crosstalks between microbes, cancer cells, and the host immune system in shaping constituents of the tumor microenvironment (TME).
2023-12-01 | GSE189925 | GEO
Project description:Solid tumors are composed of cancer cells and host immune cells that are distributed in a non-uniform pattern. Although this spatial heterogeneity may reflect mutational variations in cancer cells, mechanisms that direct the recruitment of immune cells to distinct regions within a tumor remain poorly understood. Here, we show that microbial-host interactions define tumor nests enriched in immune cells, and the distribution of microbes within tumors parallels the spatial heterogeneity of intratumoral lymphoid and myeloid cell populations. Analysis of human solid tumors revealed that the spatial distribution of immune cells, particularly CD8+ T cells, is markedly heterogeneous. Compared to T cell-poor (“cold”) tumor nests, T cell-rich (“hot”) tumor nests displayed a significantly higher number of myeloid cells, B cells, and plasma cells. We performed laser capture microdissection (LCM) followed by RNA sequencing to identify unique gene signatures that define tumor epithelium and stroma of cold and hot tumor nests. Cold tumor nests expressed genes that promote tumor proliferation and fibrosis, whereas hot tumor stroma and epithelium showed upregulation of immune-related processes, including responses to bacteria, and receptors that mediate mucosal immune responses to microbes, respectively. Consistent with these findings, we detected elevated levels of microbes within hot tumor nests in human pancreatic and lung cancers. Our data implicate host immune responses to microbes in defining intratumoral immune heterogeneity and highlight a potential role for crosstalks between microbes, cancer cells, and the host immune system in regulating cancer immunogenicity.
2023-12-01 | GSE155724 | GEO
Project description:Spatial coupling of microbes and immune cells in solid malignancies.
| PRJNA882182 | ENA
Project description:Spatial coupling of microbes and immune cells in solid malignancies
| PRJNA655408 | ENA
Project description:Spatial coupling of microbes and immune cells in solid malignancies [Whole_slides]
| PRJNA655410 | ENA
Project description:Spatial coupling of microbes and immune cells in solid malignancies [LCM_stroma_epithelium]
| PRJNA655411 | ENA
Project description:Spatial coupling of microbes and immune cells in solid malignancies [LCM_cold_hot_tumor_nest]
| PRJNA655412 | ENA