Organoids Model Transcriptional Hallmarks of Oncogenic KRAS Activation in Lung Epithelial Progenitor Cells

Cell Stem Cell. 2020 Oct 1;27(4):663-678.e8. doi: 10.1016/j.stem.2020.07.022. Epub 2020 Sep 4.

Abstract

Mutant KRAS is a common driver in epithelial cancers. Nevertheless, molecular changes occurring early after activation of oncogenic KRAS in epithelial cells remain poorly understood. We compared transcriptional changes at single-cell resolution after KRAS activation in four sample sets. In addition to patient samples and genetically engineered mouse models, we developed organoid systems from primary mouse and human induced pluripotent stem cell-derived lung epithelial cells to model early-stage lung adenocarcinoma. In all four settings, alveolar epithelial progenitor (AT2) cells expressing oncogenic KRAS had reduced expression of mature lineage identity genes. These findings demonstrate the utility of our in vitro organoid approaches for uncovering the early consequences of oncogenic KRAS expression. This resource provides an extensive collection of datasets and describes organoid tools to study the transcriptional and proteomic changes that distinguish normal epithelial progenitor cells from early-stage lung cancer, facilitating the search for targets for KRAS-driven tumors.

Keywords: KRAS; alveolar; developmental programs; early-stage lung cancer; iPSC; loss of differentiation; organoid; single-cell RNA sequencing; stage IA lung adenocarcinoma; tumor progression.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Humans
  • Induced Pluripotent Stem Cells*
  • Lung
  • Mice
  • Organoids*
  • Proteomics
  • Proto-Oncogene Proteins p21(ras) / genetics

Substances

  • KRAS protein, human
  • Proto-Oncogene Proteins p21(ras)