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Microbiology 156 (2010), 400-407; DOI  10.1099/mic.0.032730-0IMMEDIATE OPEN ACCESS ARTICLE
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Microbiology 156 (2010), 400-407; DOI  10.1099/mic.0.032730-0
© 2010 Society for General Microbiology

Quorum-sensing-regulated virulence factors in Pseudomonas aeruginosa are toxic to Lucilia sericata maggots

A. S. Andersen1,2,3, B. Joergensen2, T. Bjarnsholt3, H. Johansen3, T. Karlsmark2, M. Givskov3 and K. A. Krogfelt1

1 Statens Serum Institut ABMP, Artillerivej 5, Copenhagen S, Denmark
2 Copenhagen Wound Healing Center, Bispebjerg Hospital, Bispebjerg bakke 23, Copenhagen NV, Denmark
3 University of Copenhagen Faculty of Health Sciences, Blegdamsvej 3B, 2200 Copenhagen N, Denmark

Maggot debridement therapy (MDT) is widely used for debridement of chronic infected wounds; however, for wounds harbouring specific bacteria limited effect or failure of the treatment has been described. Here we studied the survival of Lucilia sericata maggots encountering Pseudomonas aeruginosa PAO1 in a simple assay with emphasis on the quorum-sensing (QS)-regulated virulence. The maggots were challenged with GFP-tagged P. aeruginosa wild-type (WT) PAO1 and a GFP-tagged P. aeruginosa {Delta}lasR rhlR ({Delta}RR) QS-deficient mutant in different concentrations. Maggots were killed in the presence of WT PAO1 whereas the challenge with the QS mutant showed a survival reduction of ~25 % compared to negative controls. Furthermore, bacterial intake by the maggots was lower in the presence of WT PAO1 compared to the PAO1 {Delta}RR mutant. Maggot excretions/secretions (ES) were assayed for the presence of QS inhibitors; only high doses of ES showed inhibition of QS in P. aeruginosa. Thus P. aeruginosa was shown to be toxic to L. sericata maggots. This, coupled to the preferential feeding by the maggots and reduced ingestion of P. aeruginosa, could explain MDT failure in wounds colonized by P. aeruginosa. Wounds heavily colonized with P. aeruginosa should be a counterindication for MDT unless used in combination with a pre-treatment with other topical therapeutics targeting P. aeruginosa.

Correspondence
A. S. Andersen
aea{at}ssi.dk

Abbreviations: ES, excretions/secretions; MDT, maggot debridement therapy; QS, quorum sensing; QSI, quorum sensing inhibiting; SSI, Statens Serum Institut; PON1, paraoxonase-1




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 J Antimicrob ChemotherHome page
A. S. Andersen, D. Sandvang, K. M. Schnorr, T. Kruse, S. Neve, B. Joergensen, T. Karlsmark, and K. A. Krogfelt
A novel approach to the antimicrobial activity of maggot debridement therapy
J. Antimicrob. Chemother., August 1, 2010; 65(8): 1646 - 1654.
[Abstract] [Full Text] [PDF]


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