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Pseudomonas signal molecule 3-oxo-C12-homoserine lactone interferes with binding of rosiglitazone to human PPARγ


Cooley, MA and Whittall, C and Rolph, MS, Pseudomonas signal molecule 3-oxo-C12-homoserine lactone interferes with binding of rosiglitazone to human PPARγ, Microbes and Infection: A Journal on Infectious Agents and Host Defenses, 12, (3) pp. 231-237. ISSN 1286-4579 (2010) [Refereed Article]

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DOI: doi:10.1016/j.micinf.2009.12.009


Peroxisome proliferator activated receptor (PPARã) has been suggested as a target for anti-inflammatory therapy in chronic lung disease, including infection with Pseudomonas aeruginosa. However, the P. aeruginosa signal molecule N-(3-oxo-dodecanoyl)-l-homoserine lactone (3-oxo-C12-HSL) has been reported to inhibit function of PPARs in mammalian cells. This suggests that binding of 3-oxo-C12-HSL to PPARs could increase inflammation during P. aeruginosa infection, particularly if it could compete for binding with other PPAR ligands. We investigated the ability of 3-oxo-C12-HSL to bind to a PPARã ligand binding domain (LBD) construct, and to compete for binding with the highly active synthetic PPARã agonist rosiglitazone. We demonstrate that 3-oxo-C12-HSL binds effectively to the PPARã ligand binding domain, and that concentrations of 3-oxo-C12-HSL as low as 1 nM can effectively interfere with the binding of rosiglitazone to the PPARã ligand binding domain. Because 3-oxo-C12 HSL has been demonstrated in lungs during P. aeruginosa infection, blockade of PPARã-dependent signaling by 3-oxo-C12-HSL produced by the infecting P. aeruginosa could exacerbate infection-associated inflammation, and potentially impair the action of PPAR-activating therapy. Thus the proposed use of PPARã agonists as anti-inflammatory therapy in lung P. aeruginosa infection may depend on their ability to counteract the effects of 3-oxo-C12-HSL.

Item Details

Item Type:Refereed Article
Keywords:PPAR; Pseudomonas; Inflammation; Homoserine lactones
Research Division:Biomedical and Clinical Sciences
Research Group:Clinical sciences
Research Field:Infectious diseases
Objective Division:Health
Objective Group:Clinical health
Objective Field:Clinical health not elsewhere classified
UTAS Author:Cooley, MA (Associate Professor Margaret Cooley)
ID Code:65396
Year Published:2010
Web of Science® Times Cited:38
Deposited By:Menzies Institute for Medical Research
Deposited On:2010-11-10
Last Modified:2014-11-25
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