研究 EGFR-L858R 突变型肺泡 II 型细胞生长机制的基于智能体建模框架
An agent-based modelling framework to study growth mechanisms in EGFR-L858R mutant alveolar type II cells
AI总结：
本文结合小鼠肺泡 II 型类器官实验与格点智能体模拟，揭示 EGFR-L858R 通过表面细胞集中分裂导致出芽扩张，并指出空间环境影响其肿瘤发生风险。
摘要：
表皮生长因子受体（EGFR）突变在非小细胞肺癌（NSCLC）中很常见，尤其是在从不吸烟的患者中。然而，这些突变并不总是致癌的；近期研究在患有和未患有肺癌的患者的组织学正常肺组织中均发现了此类突变。为研究健康肺干细胞中 EGFR 突变的结果，我们在三维 Matrigel 中以单克隆方式培养小鼠肺泡 II 型类器官。实验表明，EGFR-L858R 突变会引起类器官结构变化：与近球形的非突变对照组相比，突变类器官表现出更多“出芽”。我们进行了格点上计算模拟，结果表明该现象可由类器官表面少数细胞集中分裂来解释，而这种集中分裂可能源于若干可能的生物学机制。结果提示，L858R 突变产生的结构会通过表面突起快速扩张。目前我们尚无法区分导致这种生长空间异质性的细胞层面机制，但提出了若干可用于辨别的未来实验。我们认为，L858R 驱动的肿瘤发生可能性不仅受细胞适应度随机波动影响，还取决于突变是否发生在允许突变细胞繁殖而不必被迫相互接触的空间环境中。这些数据或对癌症预防策略及理解 NSCLC 进展具有意义。
英文摘要：
Mutations in the epidermal growth factor receptor (EGFR) are common in non-small cell lung cancer (NSCLC), particularly in never-smoker patients. However, these mutations are not always carcinogenic, and have recently been reported in histologically normal lung tissue from patients with and without lung cancer. To investigate the outcome of EGFR mutation in healthy lung stem cells, we grew murine alveolar type-II organoids monoclonally in a 3D Matrigel. Our experiments showed that the \textit{EGFR-L858R} mutation induced a change in organoid structure: mutated organoids displayed more `budding', in comparison to non-mutant controls, which were nearly spherical. We perform on-lattice computational simulations, which suggest that this can be explained by the concentration of division amongst a small number of cells on the surface of the organoid, which may arise from several possible biological mechanisms. These results suggest that the L858R mutation produces structures which expand quickly from surface protrusions. We are currently unable to distinguish the cell-based mechanisms that lead to this spatial heterogeneity in growth, but suggest a number of future experiments which could be used to do so. We suggest that the likelihood of L858R-fuelled tumorigenesis is affected not just by random fluctuations in cell fitness, but by whether the mutation arises in a spatial environment that allows mutant cells to reproduce without being forced to encounter each other. These data may have implications for cancer prevention strategies and for understanding NSCLC progression.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
