Network Analysis of Lung Transcriptomics Reveals a Distinct B-Cell Signature in Emphysema.

Abstract:

RATIONALE:Chronic obstructive pulmonary disease (COPD) is characterized by chronic airflow limitation caused by a combination of airways disease (bronchiolitis) and parenchymal destruction (emphysema), whose relative proportion varies from patient to patient. OBJECTIVES:To explore and contrast the molecular pathogenesis of emphysema and bronchiolitis in COPD. METHODS:We used network analysis of lung transcriptomics (Affymetrix arrays) in 70 former smokers with COPD to compare differential expression and gene coexpression in bronchiolitis and emphysema. MEASUREMENTS AND MAIN RESULTS:We observed that in emphysema (but not in bronchiolitis) (1) up-regulated genes were enriched in ontologies related to B-cell homing and activation; (2) the immune coexpression network had a central core of B cell-related genes; (3) B-cell recruitment and immunoglobulin transcription genes (CXCL13, CCL19, and POU2AF1) correlated with emphysema severity; (4) there were lymphoid follicles (CD20(+)IgM(+)) with active B cells (phosphorylated nuclear factor-κB p65(+)), proliferation markers (Ki-67(+)), and class-switched B cells (IgG(+)); and (5) both TNFRSF17 mRNA and B cell-activating factor protein were up-regulated. These findings were by and large reproduced in a group of patients with incipient emphysema and when patients with emphysema were matched for the severity of airflow limitation of those with bronchiolitis. CONCLUSIONS:Our study identifies enrichment in B cell-related genes in patients with COPD with emphysema that is absent in bronchiolitis. These observations contribute to a better understanding of COPD pathobiology and may open new therapeutic opportunities for patients with COPD.

authors

Faner R,Cruz T,Casserras T,López-Giraldo A,Noell G,Coca I,Tal-Singer R,Miller B,Rodriguez-Roisin R,Spira A,Kalko SG,Agustí A

doi

10.1164/rccm.201507-1311OC

subject

Has Abstract

pub_date

2016-06-01 00:00:00

pages

1242-53

issue

11

eissn

1073-449X

issn

1535-4970

journal_volume

193

pub_type

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