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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Front+Microbiol
2015 ; 6
(ä): 866
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English Wikipedia
Pseudomonas aeruginosa inhibits the growth of Scedosporium aurantiacum, an
opportunistic fungal pathogen isolated from the lungs of cystic fibrosis
patients
#MMPMID26379643
Kaur J
; Pethani BP
; Kumar S
; Kim M
; Sunna A
; Kautto L
; Penesyan A
; Paulsen IT
; Nevalainen H
Front Microbiol
2015[]; 6
(ä): 866
PMID26379643
show ga
The filamentous fungus Scedosporium aurantiacum and the bacterium Pseudomonas
aeruginosa are opportunistic pathogens isolated from lungs of the cystic fibrosis
(CF) patients. P. aeruginosa has been known to suppress the growth of a number of
CF related fungi such as Aspergillus fumigatus, Candida albicans, and
Cryptococcus neoformans. However, the interactions between P. aeruginosa and S.
aurantiacum have not been investigated in depth. Hence we assessed the effect of
P. aeruginosa reference strain PAO1 and two clinical isolates PASS1 and PASS2 on
the growth of two clinical S. aurantiacum isolates WM 06.482 and WM 08.202 using
solid plate assays and liquid cultures, in a synthetic medium mimicking the
nutrient condition in the CF sputum. Solid plate assays showed a clear inhibition
of growth of both S. aurantiacum strains when cultured with P. aeruginosa strains
PASS1 and PAO1. The inhibitory effect was confirmed by confocal microscopy. In
addition to using chemical fluorescent stains, strains tagged with yfp (P.
aeruginosa PASS1) and mCherry (S. aurantiacum WM 06.482) were created to
facilitate detailed microscopic observations on strain interaction. To our
knowledge, this is the first study describing successful genetic transformation
of S. aurantiacum. Inhibition of growth was observed only in co-cultures of P.
aeruginosa and S. aurantiacum; the cell fractions obtained from independent
bacterial monocultures failed to initiate a response against the fungus. In the
liquid co-cultures, biofilm forming P. aeruginosa strains PASS1 and PAO1
displayed higher inhibition of fungal growth when compared to PASS2. No change
was observed in the inhibition pattern when direct cell contact between the
bacterial and fungal strains was prevented using a separation membrane suggesting
the involvement of extracellular metabolites in the fungal inhibition. However,
one of the most commonly described bacterial virulence factors, pyocyanin, had no
effect against either of the S. aurantiacum strains. This study shows that P.
aeruginosa has a substantial inhibitory effect on the growth of the recently
described CF fungal pathogen S. aurantiacum. The findings also highlighted that
P. aeruginosa biofilm formation is important but not crucial for inhibiting the
growth of S. aurantiacum in a lung- mimicking environment.