1887

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Volume 65, Issue 11

resistance to antibiotics in biofilm-induced conditions is related to efflux pumps Free

Abstract

, the causative agent of melioidosis, has been found to increase its resistance to antibiotics when growing as a biofilm. The resistance is related to several mechanisms. One of the possible mechanisms is the efflux pump. Using bioinformatics analysis, it was found that BPSL1661, BPSL1664 and BPSL1665 were orthologous genes of the efflux transporter encoding genes for biofilm-related antibiotic resistance, PA1874–PA1877 genes in strain PAO1. Expression of selected encoding genes for the efflux transporter system during biofilm formation were investigated. Real-time reverse transcriptase PCR expression of , cytoplasmic membrane protein of AmrAB-OprA efflux transporter encoding gene, was slightly increased, while BPSL1665 was significantly increased during growth of bacteria in biofilm formation. Minimum biofilm inhibition concentration and minimum biofilm eradication concentration (MBEC) of ceftazidime (CTZ), doxycycline (DOX) and imipenem were found to be 2- to 1024-times increased when compared to their MICs for of planktonic cells. Inhibition of the efflux transporter by adding phenylalanine arginine β-napthylamide (PAβN), a universal efflux inhibitor, decreased 2 to 16 times as much as MBEC in biofilms with CTZ and DOX. When the intracellular accumulation of antibiotics was tested to reveal the pump inhibition, only the concentrations of CTZ and DOX increased in PAβN treated biofilm. Taken together, these results indicated that BPSL1665, a putative precursor of the efflux pump gene, might be related to the adaptation of in biofilm conditions. Inhibition of efflux pumps may lead to a decrease of resistance to CTZ and DOX in biofilm cells.

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Keyword(s): Biofilm , drugs resistance , efflux pump inhibitor , efflux pumps and melioidosis
© 2016 The Authors
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2016-11-16
2024-04-24
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Burkholderia pseudomallei resistance to antibiotics in biofilm-induced conditions is related to efflux pumps
J. Med. Microbiol. 65, 1296 (2016); https://doi.org/10.1099/jmm.0.000358
/content/journal/jmm/10.1099/jmm.0.000358
/content/journal/jmm/10.1099/jmm.0.000358
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