Int. J. Mol. Sci. 2013, 14(6), 12186-12204; doi:10.3390/ijms140612186
Article

Effect of GABA, a Bacterial Metabolite, on Pseudomonas fluorescens Surface Properties and Cytotoxicity

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Received: 6 May 2013; in revised form: 23 May 2013 / Accepted: 27 May 2013 / Published: 6 June 2013
(This article belongs to the Special Issue Quorum Sensing Research in Microbial Systems)
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Abstract: Different bacterial species and, particularly Pseudomonas fluorescens, can produce gamma-aminobutyric acid (GABA) and express GABA-binding proteins. In this study, we investigated the effect of GABA on the virulence and biofilm formation activity of different strains of P. fluorescens. Exposure of a psychotropic strain of P. fluorescens (MF37) to GABA (10−5 M) increased its necrotic-like activity on eukaryotic (glial) cells, but reduced its apoptotic effect. Conversely, muscimol and bicuculline, the selective agonist and antagonist of eukaryote GABAA receptors, respectively, were ineffective. P. fluorescens MF37 did not produce biosurfactants, and its caseinase, esterase, amylase, hemolytic activity or pyoverdine productions were unchanged. In contrast, the effect of GABA was associated to rearrangements of the lipopolysaccharide (LPS) structure, particularly in the lipid A region. The surface hydrophobicity of MF37 was marginally modified, and GABA reduced its biofilm formation activity on PVC, but not on glass, although the initial adhesion was increased. Five other P. fluorescens strains were studied, and only one, MFP05, a strain isolated from human skin, showed structural differences of biofilm maturation after exposure to GABA. These results reveal that GABA can regulate the LPS structure and cytotoxicity of P. fluorescens, but that this property is specific to some strains.
Keywords: host-microbial interactions; cytotoxicity; virulence; bacterial adhesion; lipopolysaccharide; biofilms; pyoverdine
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Dagorn, A.; Chapalain, A.; Mijouin, L.; Hillion, M.; Duclairoir-Poc, C.; Chevalier, S.; Taupin, L.; Orange, N.; Feuilloley, M.G.J. Effect of GABA, a Bacterial Metabolite, on Pseudomonas fluorescens Surface Properties and Cytotoxicity. Int. J. Mol. Sci. 2013, 14, 12186-12204.

AMA Style

Dagorn A, Chapalain A, Mijouin L, Hillion M, Duclairoir-Poc C, Chevalier S, Taupin L, Orange N, Feuilloley MGJ. Effect of GABA, a Bacterial Metabolite, on Pseudomonas fluorescens Surface Properties and Cytotoxicity. International Journal of Molecular Sciences. 2013; 14(6):12186-12204.

Chicago/Turabian Style

Dagorn, Audrey; Chapalain, Annelise; Mijouin, Lily; Hillion, Mélanie; Duclairoir-Poc, Cécile; Chevalier, Sylvie; Taupin, Laure; Orange, Nicole; Feuilloley, Marc G.J. 2013. "Effect of GABA, a Bacterial Metabolite, on Pseudomonas fluorescens Surface Properties and Cytotoxicity." Int. J. Mol. Sci. 14, no. 6: 12186-12204.


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