MOSAIC: Targeting the Tissue State

总结：项目1：靶向胶质瘤组织状态 胶质母细胞瘤（GBM）显示出广泛的细胞异质性，这代表了有效治疗的主要障碍。 治疗这种细胞异质性不仅包括多种肿瘤细胞突变因子， 肿瘤细胞的行为，但也影响各种非肿瘤细胞，有助于肿瘤的发生，发展， 治疗反应。事实上，GBM的微环境是多方面的，包括可溶性因子、细胞外因子和细胞外基质。 基质成分、组织驻留细胞（神经元、星形胶质细胞、内皮细胞、周细胞等）和居民（例如 小胶质细胞）或募集的（例如骨髓来源的巨噬细胞）免疫细胞。重要的是， 细胞组成和细胞表型可以改变GBM组织状态以驱动肿瘤生长和治疗 阻力因此，确定独特的细胞组成和破译多方面的双向 在各种GBM组织状态中肿瘤细胞和肿瘤微环境信号之间的网络可以导致 确定新的治疗策略。 我们使用治疗前和治疗后GBM的单核RNAseq的初步研究已经鉴定了3种组织 状态，对应于肿瘤和非肿瘤细胞亚群的共居模式。这些 对应于浸润的脑、高度细胞增殖的肿瘤和星形细胞/炎症反应性组织， 在治疗后样品中观察到，并富含特定的骨髓细胞群， 间充质胶质瘤细胞胶质瘤中特异性非肿瘤细胞表型的共居 微环境可能影响胶质瘤状态特征（星形胶质细胞样/间充质细胞、祖细胞、增殖） 与肿瘤进展和治疗反应有关。这个项目的目标是定义模式 与组织状态和影响局部组织的串扰信号相关的细胞同居 状态、表型表达、转变和疾病进展。因为它在相声中的作用 在GBM的特定人群之间，我们将首先测试靶向TWEAK-Fn 14信号传导的作用， 组织状态的变化。我们假设，针对这一点以及其他关键的串扰信号通路 将诱导组织状态转变，细胞群中相应的改变将使肿瘤 对治疗脆弱性更敏感，并且可以用来减缓肿瘤生长/进展。 为了研究这些关键状态及其串扰的潜在影响，我们提出了三个目标。目标1侧重于 改善我们对治疗前后神经胶质瘤组织状态的理解。目的2 研究神经胶质瘤细胞与其微环境之间的相互作用，以及它如何影响 进展目标3更局部地关注串扰扰动如何影响组织状态转变。

SUMMARY: PROJECT 1: TARGETING GLIOMA TISSUE STATES Glioblastoma (GBM) displays extensive cellular heterogeneity which represents a major obstacle for effective treatment. This cellular heterogeneity not only consists of multiple tumor cell mutation factors that drive distinct tumor cell behavior, but also impacts various non-tumor cells, contributing to tumor initiation, progression, and treatment response. In fact, GBM’s microenvironment is multifaceted and consists of soluble factors, extracellular matrix components, tissue-resident cells (neuron, astrocytes, endothelial cells, pericytes, etc.) and resident (e.g. microglia) or recruited (e.g. bone-marrow derived macrophages) immune cells. Importantly, changes in the cellular composition and cellular phenotypes can alter GBM tissue states to drive tumor growth and therapeutic resistance. Thus, identifying the unique cellular composition and deciphering the multifaceted bidirectional network between tumor cells and tumor microenvironment signals in various GBM tissue states can lead to identification of novel therapeutic strategies. Our preliminary studies using single nucleus RNAseq of pre- and post-treatment GBM has identified 3 tissue states, corresponding to patterns of cohabitation of tumor and non-tumoral cell subpopulations. These correspond to infiltrated brain, highly cellular proliferating tumor, and astrocytic / inflamed reactive tissue, which is observed in the post-treatment samples and enriched in specific populations of myeloid cells and mesenchymal glioma cells. Co-habitation of specific non-tumor cellular phenotypes in the glioma microenvironment may influence glioma states signatures (astrocyte-like/mesenchymal, progenitor, proliferative) that associate with tumor progression and therapeutic response. The goal of this project is to define the patterns of cellular cohabitation associated with the tissue states and the cross-talk signals that influence local tissue state, phenotypic expression, transitions and disease progression. Because of its known role in cross-talk between specific populations in GBM, we will initially test the effects of targeting TWEAK-Fn14 signaling to drive changes in tissue state. We hypothesize that targeting this as well as other key cross-talk signaling pathways will induce tissue state transitions with corresponding alterations in cellular populations that will render tumors more sensitive to therapeutic vulnerabilities and can be leveraged to slow tumor growth/progression. To investigate the potential impact of such key states and their cross-talk, we propose three aims. Aim 1 focuses on refining our understanding of glioma tissue states in both the pre- and post- treatment setting. Aim 2 investigates cross talk between the glioma cells and their microenvironment and how it may influence progression. Aim 3 looks more locally at how cross-talk perturbations may impact tissue state transition.