Distinct Cancer-Promoting Stromal Gene Expression Depending on Lung Function

• Published in: American journal of respiratory and critical care medicine Vol. 200; no. 3; pp. 348 - 358
• Main Authors: Sandri, Brian J., Masvidal, Laia, Murie, Carl, Bartish, Margarita, Avdulov, Svetlana, Higgins, LeeAnn, Markowski, Todd, Peterson, Mark, Bergh, Jonas, Yang, Ping, Rolny, Charlotte, Limper, Andrew H., Griffin, Timothy J., Bitterman, Peter B., Wendt, Chris H., Larsson, Ola
• Format: Journal Article
• Language: English
• Published: United States American Thoracic Society 01.08.2019
• Subjects: Adult; Aged; Aged, 80 and over; Autophagy; Case-Control Studies; Cell cycle; Chronic obstructive pulmonary disease; Critical care; Emphysema; Female; Fibroblasts; Forced Expiratory Volume; Gene expression; Genomes; Humans; Lung cancer; Lung diseases; Lung Neoplasms - etiology; Male; Medicine; Middle Aged; Original; Proteins; Proteome; Proteomics; Pulmonary Disease, Chronic Obstructive - genetics; Pulmonary Disease, Chronic Obstructive - pathology; Pulmonary Disease, Chronic Obstructive - physiopathology; Senescence; Stromal Cells - pathology; Transcriptome; Sweden; Minnesota; translation; cancer; fibroblast; secretome; COPD
• ISSN: 1073-449X; 1535-4970; 1535-4970
• DOI: 10.1164/rccm.201801-0080OC

Chronic obstructive pulmonary disease is an independent risk factor for lung cancer, but the underlying molecular mechanisms are unknown. We hypothesized that lung stromal cells activate pathological gene expression programs that support oncogenesis. To identify molecular mechanisms operating in the lung stroma that support the development of lung cancer. The study included subjects with and without lung cancer across a spectrum of lung-function values. We conducted a multiomics analysis of nonmalignant lung tissue to quantify the transcriptome, translatome, and proteome. Cancer-associated gene expression changes predominantly manifested as alterations in the efficiency of mRNA translation modulating protein levels in the absence of corresponding changes in mRNA levels. The molecular mechanisms that drove these cancer-associated translation programs differed based on lung function. In subjects with normal to mildly impaired lung function, the mammalian target of rapamycin (mTOR) pathway served as an upstream driver, whereas in subjects with severe airflow obstruction, pathways downstream of pathological extracellular matrix emerged. Consistent with a role during cancer initiation, both the mTOR and extracellular matrix gene expression programs paralleled the activation of previously identified procancer secretomes. Furthermore, an examination of lung tissue showed that stromal fibroblasts expressed cancer-associated proteins from two procancer secretomes: one that included IL-6 (in cases of mild or no airflow obstruction), and one that included BMP1 (in cases of severe airflow obstruction). Two distinct stromal gene expression programs that promote cancer initiation are activated in patients with lung cancer depending on lung function. Our work has implications both for screening strategies and for personalized approaches to cancer treatment.