Gene profile of fibroblasts identify relation of CCL8 with idiopathic pulmonary fibrosis

• Published in: Respiratory research Vol. 18; no. 1; p. 3
• Main Authors: Lee, Jong-Uk, Cheong, Hyun Sub, Shim, Eun-Young, Bae, Da-Jeong, Chang, Hun Soo, Uh, Soo-Taek, Kim, Young Hoon, Park, Jong-Sook, Lee, Bora, Shin, Hyoung Doo, Park, Choon-Sik
• Format: Journal Article
• Language: English
• Published: England BioMed Central Ltd 05.01.2017; BioMed Central
• Subjects: Adult; Aged; Biomarkers - metabolism; Chemokine CCL8 - metabolism; Extracellular matrix; Female; Fibroblasts - metabolism; Fibroblasts - pathology; Gene expression; Gene Expression Profiling; Genetic aspects; Humans; Hypersensitivity; Idiopathic Pulmonary Fibrosis - metabolism; Idiopathic Pulmonary Fibrosis - pathology; Male; Messenger RNA; Middle Aged; Pulmonary fibrosis; Taiwan; CCL8; Gene expression; IPF; Transcriptome
• ISSN: 1465-993X; 1465-9921; 1465-993X
• DOI: 10.1186/s12931-016-0493-6

Idiopathic pulmonary fibrosis (IPF) is characterized by the complex interaction of cells involved in chronic inflammation and fibrosis. Global gene expression of a homogenous cell population will identify novel candidate genes. Gene expression of fibroblasts derived from lung tissues (8 IPF and 4 controls) was profiled, and ontology and functional pathway were analyzed in the genes exhibiting >2 absolute fold changes with p-values < 0.05. CCL8 mRNA and protein levels were quantified using real-time PCR and ELISA. CCL8 localization was evaluated by immunofluorescence staining. One hundred seventy eight genes differentially expressed and 15 genes exhibited >10-fold change. Among them, 13 were novel in relation with IPF. CCL8 expression was 22.8-fold higher in IPF fibroblasts. The levels of CCL8 mRNA and protein were 3 and 9-fold higher in 14 IPF fibroblasts than those in 10 control fibroblasts by real-time PCR and ELISA (p = 0.022 and p = 0.026, respectively). The CCL8 concentrations in BAL fluid was significantly higher in 86 patients with IPF than those in 41 controls, and other interstitial lung diseases including non-specific interstitial pneumonia (n = 22), hypersensitivity pneumonitis (n = 20) and sarcoidosis (n = 19) (p < 0.005, respectively). Cut-off values of 2.29 pg/mL and 0.43 pg/mL possessed 80.2 and 70.7% accuracy for the discrimination of IPF from NC and the other lung diseases, respectively. IPF subjects with CCL8 levels >28.61 pg/mL showed shorter survival compared to those with lower levels (p = 0.012). CCL8 was expressed by α-SMA-positive cells in the interstitium of IPF. Transcriptome analysis identified several novel IPF-related genes. Among them, CCL8 is a candidate molecule for the differential diagnosis and prediction of survival.