Journal
ONCOGENE
Volume 36, Issue 41, Pages 5681-5694Publisher
SPRINGERNATURE
DOI: 10.1038/onc.2017.177
Keywords
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Funding
- Academy of Finland [251314, 135560, 263770, 140974/AM, 284618, 279760/GHW]
- Academy of Finland (AKA) [135560, 284618, 140974, 135560, 263770, 284618, 140974, 263770] Funding Source: Academy of Finland (AKA)
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In many cancer types, integrin-mediated signaling regulates proliferation, survival and invasion of tumorigenic cells. However, it is still unclear how integrins crosstalk with oncogenes to regulate tumorigenesis and metastasis. Here we show that oncogenic K-Ras(V12) upregulates alpha 6-integrin expression in Madin-Darby canine kidney (MDCK) cells via activation of the mitogen-activated protein kinase/extracellular signal-regulated kinase (ERK)/Fos-related antigen 1-signaling cascade. Activated alpha 6-integrins promoted metastatic capacity and anoikis resistance, and led to perturbed growth of MDCK cysts. Transcriptomic analysis of K-Ras(V12)-transformed MDCK cells also revealed robust downregulation of alpha V-class integrins. Re-expression of alpha V-integrin in K-Ras(V12)-transformed MDCK cells synergistically upregulated the expression of Zinc finger E-box-binding homeobox 1 and Twist-related protein 1 and triggered epithelial-mesenchymal transition leading to induced cell motility and invasion. These results delineate the signaling cascades connecting oncogenic K-Ras(V12) with alpha 6- and alpha V-integrin functions to modulate cancer cell survival and tumorigenesis, and reveal new possible strategies to target highly oncogenic K-Ras(V12) mutants.
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