An integrin β 3-KRAS-RalB complex drives tumour stemness and resistance to EGFR inhibition

Laetitia Seguin, Shumei Kato, Aleksandra Franovic, M. Fernanda Camargo, Jacqueline Lesperance, Kathryn C. Elliott, Mayra Yebra, Ainhoa Mielgo, Andrew M. Lowy, Hatim Husain, Tina Cascone, Lixia Diao, Jing Wang, Ignacio I. Wistuba, John V. Heymach, Scott M. Lippman, Jay S. Desgrosellier, Sudarshan Anand, Sara M. Weis, David A. Cheresh

Research output: Contribution to journalArticlepeer-review

295 Scopus citations


Tumour cells, with stem-like properties, are highly aggressive and often show drug resistance. Here, we reveal that integrin v 2 3 serves as a marker of breast, lung and pancreatic carcinomas with stem-like properties that are highly resistant to receptor tyrosine kinase inhibitors such as erlotinib. This was observed in vitro and in mice bearing patient-derived tumour xenografts or in clinical specimens from lung cancer patients who had progressed on erlotinib. Mechanistically, v 2 3, in the unliganded state, recruits KRAS and RalB to the tumour cell plasma membrane, leading to the activation of TBK1 and NF-κB. In fact, v 2 3 expression and the resulting KRAS-RalB-NF-κ B pathway were both necessary and sufficient for tumour initiation, anchorage independence, self-renewal and erlotinib resistance. Pharmacological targeting of this pathway with bortezomib reversed both tumour stemness and erlotinib resistance. These findings not only identify v 2 3 as a marker/driver of carcinoma stemness but also reveal a therapeutic strategy to sensitize such tumours to RTK inhibition.

Original languageEnglish (US)
Pages (from-to)457-468
Number of pages12
JournalNature Cell Biology
Issue number5
StatePublished - 2014
Externally publishedYes

ASJC Scopus subject areas

  • Cell Biology


Dive into the research topics of 'An integrin β 3-KRAS-RalB complex drives tumour stemness and resistance to EGFR inhibition'. Together they form a unique fingerprint.

Cite this