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Suppression of lung adenocarcinoma progression by Nkx2-1.

Despite the high prevalence and poor outcome of patients with metastatic lung cancer the mechanisms of tumour progression and metastasis remain largely uncharacterized. Here we modelled human lung adenocarcinoma, which frequently harbours activating point mutations in KRAS and inactivation of the p53 pathway, using conditional alleles in mice. Lentiviral-mediated somatic activation of oncogenic Kras and deletion of p53 in the lung epithelial cells of Kras(LSL-G12D/+);p53(flox/flox) mice initiates lung adenocarcinoma development. Although tumours are initiated synchronously by defined genetic alterations, only a subset becomes malignant, indicating that disease progression requires additional alterations. Identification of the lentiviral integration sites allowed us to distinguish metastatic from non-metastatic tumours and determine the gene expression alterations that distinguish these tumour types. Cross-species analysis identified the NK2-related homeobox transcription factor Nkx2-1 (also called Ttf-1 or Titf1) as a candidate suppressor of malignant progression. In this mouse model, Nkx2-1 negativity is pathognomonic of high-grade poorly differentiated tumours. Gain- and loss-of-function experiments in cells derived from metastatic and non-metastatic tumours demonstrated that Nkx2-1 controls tumour differentiation and limits metastatic potential in vivo. Interrogation of Nkx2-1-regulated genes, analysis of tumours at defined developmental stages, and functional complementation experiments indicate that Nkx2-1 constrains tumours in part by repressing the embryonically restricted chromatin regulator Hmga2. Whereas focal amplification of NKX2-1 in a fraction of human lung adenocarcinomas has focused attention on its oncogenic function, our data specifically link Nkx2-1 downregulation to loss of differentiation, enhanced tumour seeding ability and increased metastatic proclivity. Thus, the oncogenic and suppressive functions of Nkx2-1 in the same tumour type substantiate its role as a dual function lineage factor.

Pubmed ID: 21471965

Authors

  • Winslow MM
  • Dayton TL
  • Verhaak RG
  • Kim-Kiselak C
  • Snyder EL
  • Feldser DM
  • Hubbard DD
  • DuPage MJ
  • Whittaker CA
  • Hoersch S
  • Yoon S
  • Crowley D
  • Bronson RT
  • Chiang DY
  • Meyerson M
  • Jacks T

Journal

Nature

Publication Data

May 5, 2011

Associated Grants

  • Agency: NCI NIH HHS, Id: K08 CA154784
  • Agency: NCI NIH HHS, Id: K99-CA151968
  • Agency: NCI NIH HHS, Id: P30 CA014051
  • Agency: NCI NIH HHS, Id: P30 CA014051-36
  • Agency: NCI NIH HHS, Id: P30 CA014051-37
  • Agency: NCI NIH HHS, Id: P30 CA014051-38
  • Agency: NCI NIH HHS, Id: P30 CA014051-39
  • Agency: NCI NIH HHS, Id: P30 CA014051-40
  • Agency: NCI NIH HHS, Id: P30-CA14051
  • Agency: NCI NIH HHS, Id: R00 CA151968
  • Agency: NCI NIH HHS, Id: R01 CA109038
  • Agency: NHLBI NIH HHS, Id: T32 HL007627
  • Agency: NHLBI NIH HHS, Id: T32-HL007627
  • Agency: NCI NIH HHS, Id: U01 CA084306
  • Agency: NCI NIH HHS, Id: U01 CA084306-11
  • Agency: NCI NIH HHS, Id: U01 CA084306-12
  • Agency: NCI NIH HHS, Id: U01 CA084306-13
  • Agency: NCI NIH HHS, Id: U01-CA84306
  • Agency: Howard Hughes Medical Institute, Id:
  • Agency: Howard Hughes Medical Institute, Id:

Mesh Terms

  • Adenocarcinoma
  • Animals
  • Cell Differentiation
  • Cell Line, Tumor
  • Disease Models, Animal
  • Down-Regulation
  • Gene Expression Regulation, Neoplastic
  • HMGA2 Protein
  • Humans
  • Lung Neoplasms
  • Mice
  • Nuclear Proteins
  • Transcription Factors