Shaping of the Microenvironment in Colonic Pre-Cancer by Epithelia and Microbiota

范德比尔特TBEL中心组建了一个由特定领域专家组成的多学科团队， 研究结肠癌前进展的基本和翻译途径。我们的基础工作 结肠癌前病变的两种亚型，腺瘤（AD）和无蒂锯齿状病变（SSL），描述了结肠癌的早期 通过肿瘤细胞调节免疫微环境而形成的肿瘤发生的起源， 微生物我们已经证明，SSLs起源于胃粘膜表面的胃上皮化生， 细胞毒性免疫微环境，而AD是由干细胞衍生的WNT激活引起的， 基地在这个中心，我们将扩展我们对特定生物学机制的研究， 这些癌前病变进展或无痛的轨迹。基本项目1调查 嗜酸性粒细胞-AD串扰的贡献，主要是通过细胞表面和释放的二肽酶1（DPEP 1） 在AD进展的过程中，在小的细胞外囊泡中。翻译项目2研究，在人类 前瞻性研究，诱导遗传毒性应激的pks+大肠杆菌与癌前病变的关联 进展，以及结肠上皮细胞和粘膜机制，可能有助于息肉促进 微环境基本项目3研究了在调节抗原呈递中获得干性， 在肿瘤细胞和免疫系统之间的共同进化的背景下，细胞毒性T细胞。联合分析 常见结直肠癌前组织的研究将促进所有组织的持续迭代和整合过程 项目我们的TBEL中心提供了一个互补的融合，从还原论和系统生物学的方法， 研究结肠癌前肿瘤进展为CRC的关键因素。工作 将利用人类组织的尖端技术，包括单细胞和空间转录组学，小 细胞外囊泡分析、多重成像、纵向数据分析和下一代计算 算法此外，范德比尔特GI先前建立的大量人类息肉资源 研究卓越的专业计划和NCI Moonshot人类肿瘤图谱网络将被 由TBEL中心的同一个调查小组利用。此外，创新的共文化体系 将被每个项目所采用，其中极化癌前类器官可以与关键细胞共培养。 暴露于来自腔侧或基底侧的肿瘤细胞的微环境元素。这项工作将告知 建立肿瘤发展轨迹的模型，并确定进展机制， 改善结直肠癌前病变患者的风险分层、精确预防和拦截， 癌的

The Vanderbilt TBEL Center assembles a multi-disciplinary team of field-specific experts to collaboratively investigate the basic and translational pathways of colonic pre-cancer progression. Our foundational work on two subtypes of colonic pre-cancers, adenomas (ADs) and sessile serrated lesions (SSLs), depicts the early origins of tumorigenesis that are shaped by modulation of the immune microenvironment via neoplastic cells and the microbiota. We have shown that SSLs originate from gastric metaplasia arising from the mucosal surface in a cytotoxic immune microenvironment, whereas ADs arise from stem cell-derived WNT activation at the crypt base. In this center, we will extend our investigation of specific biological mechanisms towards the developmental trajectories of these pre-malignant lesions into progression or indolence. Basic Project 1 investigates the contribution of neutrophil-AD crosstalk, largely via dipeptidase 1 (DPEP1) both at the cell surface and released in small extracellular vesicles, in the course of AD progression. Translational Project 2 investigates, in human prospective studies, the association of pks+ Escherichia coli that induces genotoxic stress with pre-cancer progression, as well as colon epithelial cell and mucosa mechanisms that may contribute to a polyp-promoting microenvironment. Basic Project 3 investigates acquisition of stemness in modulating antigen presentation to cytotoxic T cells in the context of co-evolution between neoplastic cells and the immune system. Joint analysis of common colorectal pre-cancer tissues will facilitate an ongoing process of iteration and integration across all projects. Our TBEL Center offers a complementary blend, from reductionist and systems biology approaches, to investigate critical factors involved in the progression of pre-cancerous tumors of the colon to CRC. The work will utilize cutting-edge technologies on human tissues, including single-cell and spatial transcriptomics, small extracellular vesicle profiling, multiplex imaging, longitudinal data analysis, and next-generation computational algorithms. In addition, substantial human polyp resources previously established by the Vanderbilt GI Specialized Programs of Research Excellence and the NCI Moonshot Human Tumor Atlas Network will be leveraged by the same team of investigators in the TBEL Center. In addition, an innovative co-culture system will be employed by each project, where polarizing pre-cancer organoids can be co-cultured with key microenvironment elements exposed to neoplastic cells from the luminal or basal side. This work will inform the modeling of tumor development trajectories and identify mechanisms of progression that will enable improvements in risk stratification, precision prevention, and interception for individuals with colorectal pre- cancers.