Physical Models for Cancer Cells with Links to Alterations in Genome Organization

癌症是一种由不断积累的连续体细胞突变引起的进化性疾病。通过获得健康优势，癌细胞经历了快速增长。该奖项的首要目标是使用理论和计算来提供对癌症和正常细胞混合物的集体运动的定量预测，并将它们与基因组组织和动力学的变化联系起来。为了实现这些目标，首席调查员(PI)将创建物理模型，以阐明控制两种细胞类型的混合物中集体细胞动力学的原理。PI还将研究正常细胞和癌细胞在染色体三维组织和动力学方面的差异。PI希望使用基于物理的想法解决的两个主要问题来自以下观察。首先，目前还不清楚单个癌细胞的产生是如何与正常细胞相互作用，并最终不受控制地扩散的。第二，正常细胞和癌细胞在通过细胞堵塞而产生的狭窄时的运动有什么不同？提出的问题是通过调查产生的，最近的实验产生了可以使用理论和计算方法定量解决的问题。为了解决癌细胞如何侵入正常细胞的空间，在这个奖项中，研究人员将开发方法来解决癌细胞与正常细胞混合时的组织和动力学问题。事实上，在组织形成的各个方面，从发育到癌症和其他疾病期间结构的分解，描述多种细胞类型是如何组织自己的是一个困难而又重要的问题。在这个奖项中，研究人员将开发新的模型来模拟细胞混合物的结构和动力学，作为细胞-细胞黏附、细胞-基质相互作用、细胞分裂和凋亡的函数。第二个目标是研究细胞通过收缩运动对正常细胞和癌细胞染色体的影响。当细胞移动时，它们的运动通过细胞拥挤和限制而受到限制，这对染色质结构产生了深远的影响，可能导致基因表达的改变。最近的大多数实验都让人瞥见了正常细胞和癌细胞之间染色体组织的差异。原发肿瘤向远处转移的能力涉及癌细胞侵入健康组织的一系列步骤。在迁移过程中，癌细胞必须(至少偶尔)挤过细胞周围细胞外基质中的狭窄。收缩的大小可能小于细胞核的大小，这可能会使细胞中的基因组变形。这个奖项需要回答的自然问题是：细胞核的变形是否会改变染色体的组织？通过使用理论方法来定量地理解这些实验，人们可以获得什么见解？回答这些问题需要开发大致从分子水平到组织水平的模型。该奖项的更广泛影响将包括开发将公开提供的精选软件。该奖项还将有助于学生和博士后研究员在跨学科领域的培训。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

Cancer is an evolutionary disease caused by steady accumulation of sequential somatic mutations. By gaining fitness advantage, cancer cells undergo rapid growth. The overarching goals of this award are to use theory and computations to provide quantitative predictions for collective motions of mixtures of cancer and normal cells and link them to changes in genome organization and dynamics. To accomplish the goals, the Principal Investigator (PI) will create physical models to elucidate the principles governing collective cell dynamics in mixtures of two cell types. The PI will also investigate the differences in the three-dimensional organization and dynamics of chromosomes between normal and cancer cells. The two major problems that the PI wishes to solve, using physics-based ideas, emerge from the following observations. First, it is unclear how the generation of a single cancer cell interacts with normal cells, and eventually spreads without control. Second, what are the differences between movements of normal and cancer cells as they move through constrictions that arise through cell jamming? The proposed problems were generated by surveying recent experiments have generated questions that can be quantitatively addressed using theoretical and computational methods. To address how cancer cells invade the space of normal cells, in this award, the investigators will develop methods to solve the organization and dynamics when cancer cells are mixed with normal cells. Indeed, in all aspects of tissue formation, ranging from development to breakdown of their structures during cancer and other diseases, the description of how multiple cell types organize themselves is a difficult but an important issue. In this award, the Investigators will develop novel models to simulate the structures and dynamics of mixtures of cells as a function of cell-cell adhesion, cell-matrix interactions, and cell division, and apoptosis. The second goal is to study the effect of cell movement through constrictions on chromosomes in normal and cancer cells. As cells move, their motions are constricted through cell jamming, driven by self-crowding of cells and confinement, which profoundly affect chromatin structures, possibly resulting in altered gene expression. Most recent experiments have given glimpses of the differences in the chromosome organization between normal and cancer cells. The ability of a primary tumor to migrate to distant parts involves a cascade of steps in the invasion of the cancer cells into heathy tissues. During migration, cancer cells have to, at least occasionally, squeeze through constrictions in the extra cellular matrix surrounding the cells. The sizes of the constrictions could be smaller than the nucleus size, which potentially deforms the genome in the cells. The natural questions that need to be answered by this award are: Does the deformation of the nucleus alter the organization of the chromosomes? What insights can one gain by using theoretical methods to quantitatively understand these experiments? Answering these questions requires development of models that go roughly from the molecular scale to tissue level. The broader impacts of this award will include the development of curated software, which will be made publicly available. This award will also contribute to the training of students and postdoctoral fellows in interdisciplinary fields.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.