Journal
CANCER RESEARCH
Volume 80, Issue 22, Pages 4960-4971Publisher
AMER ASSOC CANCER RESEARCH
DOI: 10.1158/0008-5472.CAN-19-3044
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Funding
- National Health and Medical Research Council of Australia (NHMRC) [APP1044447, APP1117044, APP631701, ID400413, ID400281]
- U.S. Army Medical Research and Materiel Command [DAMD17-01-1-0729]
- Cancer Council Victoria
- Queensland Cancer Fund
- Cancer Council New South Wales
- Cancer Council South Australia
- Cancer Foundation of Western Australia
- Cancer Council Tasmania
- Ovarian Cancer Australia
- Peter MacCallum Cancer Centre Foundation
- Mrs. Margaret Rose AM and the Rose family
- WeirAnderson Foundation
- Border Ovarian Cancer Awareness Group
- Wendy Taylor and Arthur Coombs and family
- Victorian Cancer Agency
- National Health and Medical Research Council of Australia
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Ovarian clear cell adenocarcinoma (OCCA) is characterized by a particularly poor response to conventional chemotherapy and a short overall survival time in women with established disease. The development of targeted treatments for OCCA relies on a better understanding of its molecular characteristics. IL6 is strongly expressed in OCCA and may therefore provide a novel therapeutic target. Here we use CRISPR/Cas9 and conditional short hairpin interfering RNA to perform loss-of-function studies in human OCCA cell lines to explore the requirement for IL6 in vitro and in vivo. While reduction of IL6 expression exerted limited effects in vitro, its attenuation significantly impaired tumor growth and neovascularization in vivo. In contrast to typical signaling via STAT3, IL6 in OCCA signaled via a noncanonical pathway involving gp130, Src, and the Hippo pathway protein YAP. A high-throughput combination drug screen identified agents that enhanced cell killing following reduction of IL6 signaling. Intersection of screen hits obtained from two cell lines and orthogonal approaches to attenuation of IL6 yielded AKT and EGFR inhibitors as enhancers of the inhibitory monoclonal IL6 receptor antibody tocilizumab. This study defines for the first time the requirements for, and mechanisms of, signaling by IL6 in human OCCA cell lines and identifies potential combinatory therapeutic approaches. Given the molecular diversity of OCCA, further in vitro and in vivo studies are warranted to determine whether such approaches will overcome the limited efficacy of tocilizumab observed in ovarian cancer to date. Significance: This study defines the requirements for and mechanisms of noncanonical signaling by IL6 in human ovarian clear cell adenocarcinoma cell lines and identifies combinatory therapeutic approaches to be explored clinically.
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