COPD-Type lung inflammation promotes K-ras mutant lung cancer through epithelial HIF-1α mediated tumor angiogenesis and proliferation
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Maria Miguelina De la Garza1,2, Amber M. Cumpian1, Soudabeh Daliri1, Susana Castro-Pando1, Misha Umer1, Lei Gong1,3, Nasim Khosravi1, Mauricio S. Caetano1, Marco Ramos-Castañeda1,2, Alejandra Garza Flores2, Evelyn C. Beltran2, Hai T. Tran4, Michael J. Tuvim1, Edwin J. Ostrin1,5, Burton F. Dickey1, Christopher M. Evans6 and Seyed Javad Moghaddam1,7
1Department of Pulmonary Medicine, The University of Texas M. D. Anderson Cancer Center, Houston, Texas, USA
2Tecnológico de Monterrey, Escuela de Medicina y Ciencias de la Salud, Monterrey, Nuevo León, Mexico
3Tianjin Lung Cancer Institute, Tianjin Medical University, Tianjin, China
4Department of Thoracic Head and Neck Medical Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas, USA
5Department of General Internal Medicine, The University of Texas M. D. Anderson Cancer Center, Houston, Texas, USA
6Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado Denver School of Medicine, Aurora, Colorado, USA
7The University of Texas M.D. Anderson Cancer Center UTHealth Graduate School of Biomedical Sciences, Houston, Texas, USA
Seyed Javad Moghaddam, email: email@example.com
Keywords: lung cancer; COPD; HIF-1; inflammation; K-ras
Received: February 08, 2018 Accepted: August 15, 2018 Published: August 31, 2018
Chronic obstructive pulmonary disease (COPD), an inflammatory disease of the lung, is an independent risk factor for lung cancer. Lung tissues obtained from human smokers with COPD and lung cancer demonstrate hypoxia and up-regulated hypoxia inducible factor-1 (HIF-1). HIF-1 activation is the central mechanism for controlling the cellular response to hypoxia during inflammation and tumor development. These facts suggest a link between COPD-related airway inflammation, HIF-1, and lung cancer. We have previously established a mouse model of COPD-like airway inflammation that promotes lung cancer in a K-ras mutant mouse model (CC-LR). Here we show that tumors in the CC-LR model have significantly elevated levels of HIF-1α and HIF-1 activity. To determine the tumor-promoting functions of HIF-1 in CC-LR mice, the gene Hif1a which encodes HIF-1α and is required for HIF-1 activity, was disrupted in the lung epithelium of CC-LR animals. Airway epithelial specific HIF-1α deficient mice demonstrated significant reductions in lung surface tumor numbers, tumor angiogenesis, and tumor cell proliferation in the absence or presence of COPD-like airway inflammation. In addition, when CC-LR mice were bred with transgenic animals that overexpress a constitutively active mutant form of human HIF-1α in the airway epithelium, both COPD- and adenocarcinoma-like phenotypes were observed. HIF-1α overexpressing CC-LR mice had significant emphysema, and they also showed potentiated tumorigenesis, angiogenesis, and cell proliferation accompanied by an invasive metastatic phenotype. Our gain and loss of function studies support a key role for HIF-1α in the promotion of lung cancer by COPD-like inflammation.
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