TY - JOUR
T1 - Microbial interaction between a CTXM-15-producing Escherichia coli and a susceptible Pseudomonas aeruginosa isolated from bronchoalveolar lavage
T2 - Influence of cefotaxime in the dual-species biofilm formation
AU - Bessa, Lucinda J.
AU - Mendes, Ângelo
AU - Gomes, Rita
AU - Curvelo, Sara
AU - Cravo, Sara
AU - Sousa, Emília
AU - Vasconcelos, Vitor
AU - Martins da Costa, Paulo
N1 - Publisher Copyright:
© 2015 Society for Applied Microbiology and John Wiley & Sons Ltd.
PY - 2015/6/1
Y1 - 2015/6/1
N2 - Two isolates, Escherichia coli ella00 and Pseudomonas aeruginosa ella01, obtained from bronchoalveolar lavage, were found to be closely associated in clusters in agar medium. Escherichia coli ella00 was multidrug resistant and CTXM-15 extended-spectrum β-lactamase producer, while P.aeruginosa ella01 was susceptible to all antimicrobials tested. These observations impelled for further studies aimed to understand their microbial interaction. The P.aeruginosa ella01 biofilm-forming capacity was reduced and not affected when it was co-cultured with E.coli ella00 and E.coliATCC 25922 respectively. Interestingly, the co-culture of ella isolates in the presence of high concentrations, such as 160 μgml-1, of cefotaxime allowed the formation of more biofilm than in the absence of the antibiotic. As revealed by fluorescence in situ hybridization, in co-culture, P.aeruginosa ella01 survived and subsequently flourished when exposed to this third-generation cephalosporin at a concentration 10×higher than its minimum inhibitory concentration (MIC), and this was mostly due to β-lactamases production by E.coli ella00. In fact, it was demonstrated by high-performance liquid chromatography that cefotaxime was absent for the culture medium 4h after application. In conclusion, we demonstrate that bacterial species can interact differently depending on the surrounding conditions (favourable or stressing), and that those interactions can switch from unprofitable to beneficial.
AB - Two isolates, Escherichia coli ella00 and Pseudomonas aeruginosa ella01, obtained from bronchoalveolar lavage, were found to be closely associated in clusters in agar medium. Escherichia coli ella00 was multidrug resistant and CTXM-15 extended-spectrum β-lactamase producer, while P.aeruginosa ella01 was susceptible to all antimicrobials tested. These observations impelled for further studies aimed to understand their microbial interaction. The P.aeruginosa ella01 biofilm-forming capacity was reduced and not affected when it was co-cultured with E.coli ella00 and E.coliATCC 25922 respectively. Interestingly, the co-culture of ella isolates in the presence of high concentrations, such as 160 μgml-1, of cefotaxime allowed the formation of more biofilm than in the absence of the antibiotic. As revealed by fluorescence in situ hybridization, in co-culture, P.aeruginosa ella01 survived and subsequently flourished when exposed to this third-generation cephalosporin at a concentration 10×higher than its minimum inhibitory concentration (MIC), and this was mostly due to β-lactamases production by E.coli ella00. In fact, it was demonstrated by high-performance liquid chromatography that cefotaxime was absent for the culture medium 4h after application. In conclusion, we demonstrate that bacterial species can interact differently depending on the surrounding conditions (favourable or stressing), and that those interactions can switch from unprofitable to beneficial.
UR - http://www.scopus.com/inward/record.url?scp=84929289838&partnerID=8YFLogxK
U2 - 10.1111/1758-2229.12266
DO - 10.1111/1758-2229.12266
M3 - Article
C2 - 25625458
AN - SCOPUS:84929289838
SN - 1758-2229
VL - 7
SP - 420
EP - 426
JO - Environmental Microbiology Reports
JF - Environmental Microbiology Reports
IS - 3
ER -