Expression of Sme Efflux Pumps and Multilocus Sequence Typing in Clinical Isolates of Stenotrophomonas maltophilia

• Published in: Annals of laboratory medicine Vol. 32; no. 1; pp. 38 - 43
• Main Authors: Cho, Hye Hyun, Sung, Ji Youn, Kwon, Kye Chul, Koo, Sun Hoe
• Format: Journal Article
• Language: English
• Published: Korea (South) The Korean Society for Laboratory Medicine 01.01.2012; 대한진단검사의학회
• Subjects: Alleles; Anti-Infective Agents - pharmacology; Bacterial Proteins - genetics; Bacterial Proteins - metabolism; Bacterial Typing Techniques; Ciprofloxacin - pharmacology; Drug Resistance, Multiple, Bacterial; Gene Expression Regulation, Bacterial; Gram-Negative Bacterial Infections - microbiology; Humans; Microbial Sensitivity Tests; Multilocus Sequence Typing; Original; Stenotrophomonas maltophilia - classification; Stenotrophomonas maltophilia - drug effects; Stenotrophomonas maltophilia - genetics; Stenotrophomonas maltophilia - isolation & purification; 병리학; Stenotrophomonas maltophilia; smeABC; MLST; smeDEF; Efflux pump
• ISSN: 2234-3806; 2234-3814; 2234-3814
• DOI: 10.3343/alm.2012.32.1.38

Stenotrophomonas maltophilia has emerged as an important opportunistic pathogen, which causes infections that are often difficult to manage because of the inherent resistance of the pathogen to a variety of antimicrobial agents. In this study, we analyzed the expressions of smeABC and smeDEF and their correlation with antimicrobial susceptibility. We also evaluated the genetic relatedness and epidemiological links among 33 isolates of S. maltophilia. In total, 33 S. maltophilia strains were isolated from patients in a tertiary hospital in Daejeon. Minimum inhibitory concentrations (MICs) of 11 antimicrobial agents were determined by using agar dilution method and E-test (BioMérieux, France). Real-time PCR analysis was performed to evaluate the expression of the Sme efflux systems in the S. maltophilia isolates. Additionally, an epidemiological investigation was performed using multilocus sequence typing (MLST) assays. The findings of susceptibility testing showed that the majority of the S. maltophilia isolates were resistant to β-lactams and aminoglycosides. Twenty-one clinical isolates overexpressed smeABC and showed high resistance to ciprofloxacin. Moreover, a high degree of genetic diversity was observed among the S. maltophilia isolates; 3 sequence types (STs) and 23 allelic profiles were observed. The smeABC efflux pump was associated with multidrug resistance in clinical isolates of S. maltophilia. In particular, smeABC efflux pumps appear to perform an important role in ciprofloxacin resistance of S. maltophilia. The MLST scheme for S. maltophilia represents a discriminatory typing method with stable markers and is appropriate for studying population structures.