Unknown,Transcriptomics,Genomics,Proteomics

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Temporal Transcriptomic Signatures Associated with Post-viral Bronchiolitis Sequelae in Rats

ABSTRACT: Early life respiratory viral infections and atopic characteristics are significant risk factors for the development of childhood asthma. It is hypothesized that repeated respiratory viral infections might induce structural remodeling by interfering with the normal process of lung maturation; however, the specific molecular processes that mediate these developments are not understood. To define relevant molecular pathways, we used a well-established Sendai virus infection model in weanling rats to compare transcriptome signatures between a post-infection asthma prone susceptible strain (BN) and a post-infection asthma resistant strain (F344). Specific to this weanling model and not described in adult models, Sendai virus infection in the susceptible strain resulted in morphological abnormalities in distal airways that persist into adulthood, suggesting a disruption of normal lung growth. Gene expression data from infected and control lungs across five time points indicated that specific features of the immune response following viral infection were heightened and prolonged in lungs from BN compared with F344 rats. These features included an increase in macrophage cell number and related gene expression, which then transitioned to an increase in mast cell number and related gene expression. In contrast to the heightened immune response in infected BN lungs, infected F344 lungs displayed more efficient re-epithelialization. We conclude that the structural defects that developed and persisted in infected BN but not F344 lungs were preceded by a pronounced macrophage and mast cell response to viral infection acting in parallel with an inadequate re-epithelialization. For each of the five time points, one array was run for each of the four conditions (F344 control, BN control, F344 virus, BN virus) with 15 individual smaples pooled on each array.

ORGANISM(S): Rattus norvegicus

SUBMITTER: Xin Sun

PROVIDER: E-GEOD-51267 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Acute lung inflammation can alter the pulmonary function of susceptible individuals and exacerbate the pathogenesis of chronic inflammatory lung diseases including chronic obstructive pulmonary disease (COPD), cystic fibrosis and asthma. Exposure to lipopolysaccharide (LPS) or endotoxin, a constituent of outer cell membrane of gram negative bacteria, induces airway inflammation that is primarily characterized by increased polymorphonuclear neutrophils (PMNs) at early time points. Because LPS is present in variety of occupational and home environments and is an active constituent of cigarette smoke it is a risk factor for increasing prevalence and severity of non-occupational COPD, for adult onset of asthma and for wheezing in children. In airway epithelial cells, LPS stimulation increases mucin gene expression and mucous production. Hypersecretion of mucus overwhelms the ciliary clearance and obstructs airways, causing morbidity and mortality in chronic inflammatory respiratory lung diseases. In addition, acute bacterial infection contributes to the exacerbation of chronic airway diseases, specifically in advanced COPD and CF subjects, leading to increased healthcare burden and higher mortality. Bcl-2, a prosurvival protein that inhibits cell death plays a key role in normal cellular homeostasis and regulates the integrity of the mitochondrial and endoplasmic reticulum membranes. Gain- and loss-of-function studies showed that Bcl-2 expression sustains hyperplastic epithelial cells, and Bcl-2 expression is elevated in airway epithelial cells of subjects with cystic fibrosis and asthma. The present study investigated which inflammatory mediators induce mucous cell metaplasia and Bcl-2 expression following LPS exposure. Microarray analyses of mRNA from airway epithelial cells captured by laser microdissection from rat lungs snap-frozen at day 0 and 2 post LPS exposure were analyzed. Microarray analysis of mRNA from airway epithelial cells captured by laser microdissection from rat lungs snap-frozen at day 0 and day 2 post LPS exposure was performed to identify inflammatory mediators modulated by LPS exposure. Specific pathogen-free F344/NCrR male rats of 8–10 wk of age (from NCI, Frederick, MD) were exposed to LPS (1000 ug in 0.5 ML Saline) and rats were sacrificed on day 0 and day 2 of LPS exposure. Right lungs were snap-frozen in OCT and airway epithelial cells were captured by laser-dissection microsopy to extract RNA. Gene expression data from nonexposed rats (0d) was used a control.

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Temporal Transcriptomic Signatures Associated with Post-viral Bronchiolitis Sequelae in Rats

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