University Of Tasmania

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

journal contribution
posted on 2023-05-17, 03:43 authored by Cooley, MA, Whittall, C, Rolph, MS
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.


Publication title

Microbes and Infection: A Journal on Infectious Agents and Host Defenses








Tasmanian School of Medicine


Elsevier Science Bv

Place of publication

Po Box 211, Amsterdam, Netherlands, 1000 Ae

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  • Restricted

Socio-economic Objectives

Clinical health not elsewhere classified

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