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Carcinogenesis. 2019 Jun 27. pii: bgz123. doi: 10.1093/carcin/bgz123. [Epub ahead of print]

The ADAM17 Protease Promotes Tobacco Smoke Carcinogen-induced Lung Tumourigenesis.

Author information

1
Centre for Innate Immunity and Infectious Diseases, Hudson Institute of Medical Research, Clayton, Victoria, Australia.
2
Department of Molecular and Translational Sciences, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, Victoria, Australia.
3
Division of Molecular Therapeutics, Aichi Cancer Center Research Institute, Nagoya, Japan.
4
Division of Advanced Cancer Therapeutics, Nagoya University Graduate School of Medicine, Nagoya, Japan.
5
Department of Biological Regulation, Weizmann Institute of Science, Rehovot, Israel.
6
Institute of Biochemistry, Christian-Albrechts-University, Kiel, Germany.

Abstract

Lung cancer is the leading cause of cancer-related mortality, with most cases attributed to tobacco smoking, in which nicotine-derived nitrosamine ketone (NNK) is the most potent lung carcinogen. The ADAM17 protease is responsible for the ectodomain shedding of many pro-tumourigenic cytokines, growth factors and receptors, and therefore is an attractive target in cancer. However, the role of ADAM17 in promoting tobacco smoke carcinogen-induced lung carcinogenesis is unknown. The hypomorphic Adam17ex/ex mice - characterized by reduced global ADAM17 expression - were backcrossed onto the NNK-sensitive pseudo-A/J background. CRISPR-driven and inhibitor-based (GW280264X, and ADAM17 prodomain) ADAM17 targeting was employed in the human lung adenocarcinoma cell lines A549 and NCI-H23. Human lung cancer biopsies were also used for analyses. The Adam17ex/ex mice displayed marked protection against NNK-induced lung adenocarcinoma. Specifically, the number and size of lung lesions in NNK-treated pseudo-A/J Adam17ex/ex mice were significantly reduced compared to wild-type littermate controls. This was associated with lower proliferative index throughout the lung epithelium. ADAM17 targeting in A549 and NCI-H23 cells led to reduced proliferative and colony-forming capacities. Notably, among select ADAM17 substrates, ADAM17 deficiency abrogated shedding of the soluble IL-6 receptor (sIL-6R), which coincided with the blockade of sIL-6R-mediated trans-signaling via ERK MAPK cascade. Furthermore, NNK upregulated phosphorylation of p38 MAPK, whose pharmacological inhibition suppressed ADAM17 threonine phosphorylation. Importantly, ADAM17 threonine phosphorylation was significantly upregulated in human lung adenocarcinoma with smoking history compared to their cancer-free controls. Our study identifies the ADAM17/sIL-6R/ERK MAPK axis as a candidate therapeutic strategy against tobacco smoke associated lung carcinogenesis.

KEYWORDS:

ADAM17; IL-6 trans-signaling; Lung cancer; NNK; tobacco smoking

PMID:
31257400
DOI:
10.1093/carcin/bgz123

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