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Expression of PPARγ and Paraoxonase 2 correlated with Pseudomonas aeruginosa infection in Cystic Fibrosis


Griffin, PE and Roddam, LF and Belessis, YC and Strachan, R and Beggs, S and Jaffe, A and Cooley, MA, Expression of PPARγ and Paraoxonase 2 correlated with Pseudomonas aeruginosa infection in Cystic Fibrosis, PLoS One, 7, (7) Article e42241. ISSN 1932-6203 (2012) [Refereed Article]


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Licenced under Creative Commons Attribution 2.5 Generic (CC BY 2.5)

DOI: doi:10.1371/journal.pone.0042241


The Pseudomonas aeruginosa quorum sensing signal molecule N-3-oxododecanoyl-l-homoserine lactone (3OC(12)HSL) can inhibit function of the mammalian anti-inflammatory transcription factor peroxisome proliferator activated receptor (PPAR)ã, and can be degraded by human paraoxonase (PON)2. Because 3OC(12)HSL is detected in lungs of cystic fibrosis (CF) patients infected with P. aeruginosa, we investigated the relationship between P. aeruginosa infection and gene expression of PPARã and PON2 in bronchoalveolar lavage fluid (BALF) of children with CF. Total RNA was extracted from cell pellets of BALF from 43 children aged 6 months-5 years and analyzed by reverse transcription-quantitative real time PCR for gene expression of PPARã, PON2, and P. aeruginosa lasI, the 3OC(12)HSL synthase. Patients with culture-confirmed P. aeruginosa infection had significantly lower gene expression of PPARã and PON2 than patients without P. aeruginosa infection. All samples that were culture-positive for P. aeruginosa were also positive for lasI expression. There was no significant difference in PPARã or PON2 expression between patients without culture-detectable infection and those with non-Pseudomonal bacterial infection, so reduced expression was specifically associated with P. aeruginosa infection. Expression of both PPARã and PON2 was inversely correlated with neutrophil counts in BALF, but showed no correlation with other variables evaluated. Thus, lower PPARã and PON2 gene expression in the BALF of children with CF is associated specifically with P. aeruginosa infection and neutrophilia. We cannot differentiate whether this is a cause or the effect of P. aeruginosa infection, but propose that the level of expression of these genes may be a marker for susceptibility to early acquisition of P. aeruginosa in children with CF.

Item Details

Item Type:Refereed Article
Keywords:Cystic fibrosis, PPARgamma, Pseudomonas, paraoxonase
Research Division:Biomedical and Clinical Sciences
Research Group:Medical microbiology
Research Field:Medical bacteriology
Objective Division:Health
Objective Group:Clinical health
Objective Field:Clinical health not elsewhere classified
UTAS Author:Griffin, PE (Dr Phoebe Griffin)
UTAS Author:Roddam, LF (Dr Louise Roddam)
UTAS Author:Beggs, S (Dr Sean Beggs)
UTAS Author:Cooley, MA (Associate Professor Margaret Cooley)
ID Code:79388
Year Published:2012
Web of Science® Times Cited:23
Deposited By:Medicine
Deposited On:2012-09-07
Last Modified:2017-11-07
Downloads:393 View Download Statistics

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