ErbB2 Pathway Activation upon Smad4 Loss Promotes Lung Tumor Growth and Metastasis

Cell Reports
Jian LiuFrancesco J DeMayo

Abstract

Lung cancer remains the leading cause of cancer death. Genome sequencing of lung tumors from patients with squamous cell carcinoma has identified SMAD4 to be frequently mutated. Here, we use a mouse model to determine the molecular mechanisms by which Smad4 loss leads to lung cancer progression. Mice with ablation of Pten and Smad4 in airway epithelium develop metastatic adenosquamous tumors. Comparative transcriptomic and in vivo cistromic analyses determine that loss of PTEN and SMAD4 results in ELF3 and ErbB2 pathway activation due to decreased expression of ERRFI1, a negative regulator of ERBB2 in mouse and human cells. The combinatorial inhibition of ErbB2 and Akt signaling attenuate tumor progression and cell invasion, respectively. Expression profile analysis of human lung tumors substantiated the importance of the ErbB2/Akt/ELF3 signaling pathway as both a prognostic biomarker and a therapeutic drug target for treating lung cancer.

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Citations

Apr 7, 2017·Annals of Oncology : Official Journal of the European Society for Medical Oncology·Y ZhangX Wu
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Apr 8, 2021·Journal, Genetic Engineering & Biotechnology·Menha SwellamAmr Abouzid

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Datasets Mentioned

BETA
GSE11969

Methods Mentioned

BETA
immunoprecipitation
ChIP-seq
PCR

Software Mentioned

Cistromic

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