Abstract:
:Chronic obstructive pulmonary disease (COPD) is associated with an increased risk for lung cancer and an aberrant microbiota of the lung. Microbial colonization contributes to chronic neutrophilic inflammation in COPD. Nontypeable Haemophilus influenzae (NTHi) is frequently found in lungs of stable COPD patients and is the major pathogen triggering exacerbations. The epithelial cytokine interleukin-17C (IL-17C) promotes the recruitment of neutrophils into inflamed tissues. The purpose of this study was to investigate the function of IL-17C in the pulmonary tumor microenvironment. We subjected mice deficient for IL-17C (IL-17C-/-) and mice double deficient for Toll-like receptor 2 and 4 (TLR-2/4-/-) to a metastatic lung cancer model. Tumor proliferation and growth as well as the number of tumor-associated neutrophils was significantly decreased in IL-17C-/- and TLR-2/4-/- mice exposed to NTHi. The NTHi-induced pulmonary expression of IL-17C was dependent on TLR-2/4. In vitro, IL-17C increased the NTHi- and tumor necrosis factor-α-induced expression of the neutrophil chemokines keratinocyte-derived chemokine and macrophage inflammatory protein 2 in lung cancer cells but did not affect proliferation. Human lung cancer samples stained positive for IL-17C, and in non-small cell lung cancer patients with lymph node metastasis, IL-17C was identified as a negative prognostic factor. Our data indicate that epithelial IL-17C promotes neutrophilic inflammation in the tumor microenvironment and suggest that IL-17C links a pathologic microbiota, as present in COPD patients, with enhanced tumor growth.
journal_name
Oncogenejournal_title
Oncogeneauthors
Jungnickel C,Schmidt LH,Bittigkoffer L,Wolf L,Wolf A,Ritzmann F,Kamyschnikow A,Herr C,Menger MD,Spieker T,Wiewrodt R,Bals R,Beisswenger Cdoi
10.1038/onc.2017.28subject
Has Abstractpub_date
2017-07-20 00:00:00pages
4182-4190issue
29eissn
0950-9232issn
1476-5594pii
onc201728journal_volume
36pub_type
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