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Nat Cell Biol. 2014 Oct;16(10):972-7. doi: 10.1038/ncb3031. Epub 2014 Aug 31.

EGFR has a tumour-promoting role in liver macrophages during hepatocellular carcinoma formation.

Author information

1
Institute of Cancer Research, Department of Medicine I, Comprehensive Cancer Center, Medical University of Vienna, Borschkegasse 8a, A-1090 Vienna, Austria.
2
National Center for Liver Cancer. International Cooperation Laboratory on Signal Transduction, Eastern Hepatobiliary Surgery Institute / Hospital, Shanghai, 225 Changhai Road, Shanghai 200438, P.R. China.
3
Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Division of Gastroenterology and Hepatology, Medical University of Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria.
#
Contributed equally

Abstract

Hepatocellular carcinoma (HCC) is a frequent cancer with limited treatment options and poor prognosis. Tumorigenesis has been linked with macrophage-mediated chronic inflammation and diverse signalling pathways, including the epidermal growth factor receptor (EGFR) pathway. The precise role of EGFR in HCC is unknown, and EGFR inhibitors have shown disappointing clinical results. Here we discover that EGFR is expressed in liver macrophages in both human HCC and in a mouse HCC model. Mice lacking EGFR in macrophages show impaired hepatocarcinogenesis, whereas mice lacking EGFR in hepatocytes unexpectedly develop more HCC owing to increased hepatocyte damage and compensatory proliferation. Mechanistically, following interleukin-1 stimulation, EGFR is required in liver macrophages to transcriptionally induce interleukin-6, which triggers hepatocyte proliferation and HCC. Importantly, the presence of EGFR-positive liver macrophages in HCC patients is associated with poor survival. This study demonstrates a tumour-promoting mechanism for EGFR in non-tumour cells, which could lead to more effective precision medicine strategies.

PMID:
25173978
PMCID:
PMC4183558
DOI:
10.1038/ncb3031
[Indexed for MEDLINE]
Free PMC Article

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