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Ras-induced invasion and metastasis are regulated by a leukotriene B4 receptor BLT2-linked pathway

Abstract

Ras signaling pathways are well-recognized for their involvement in cancer cell proliferation; however, considerably less is known regarding their contribution to invasion and metastasis. Here, we demonstrate that a novel BLT2, a low-affinity leukotriene B4 receptor-linked signaling cascade involving the generation of reactive oxygen species (ROS) via Nox1, NF-κB stimulation and subsequent upregulation of matrix metalloproteinase-9 (MMP-9) is a potential mechanism by which Ras promotes invasion and metastasis. We found that inhibition of BLT2 signaling markedly suppressed Ras-evoked metastasis and reduced the associated mortality in mice. Consistent with the proposed role of BLT2 as a key downstream mediator of Ras signaling to metastasis, BLT2 expression alone resulted in the formation of numerous metastatic lung nodules and the nodules formation was significantly attenuated by the inhibition of MMP-9, a downstream component of BLT2. Together, our results reveal the previously unsuspected function of BLT2-linked cascade in driving oncogenic Ras-induced metastasis and would provide a valuable insight into invasion and metastasis.

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Acknowledgements

We thank Dr Takao Shimizu (University of Tokyo, Tokyo, Japan) and Dr Takehiko Yokomizo (University of Kyushu, Fukuoka, Japan) for the BLT2 expression plasmids. This work was supported by the Diseases Network Research Program (M10751050001-08N5105-00110), and the SRC-Aging and Apoptosis Research program (20090062880) from the Ministry of Education, Science, and Technology, Korea.

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Correspondence to J-H Kim.

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Supplementary Information accompanies the paper on the Oncogene website (http://www.nature.com/onc).

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Kim, EY., Seo, JM., Cho, KJ. et al. Ras-induced invasion and metastasis are regulated by a leukotriene B4 receptor BLT2-linked pathway. Oncogene 29, 1167–1178 (2010). https://doi.org/10.1038/onc.2009.412

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