Different Virulence Capabilities and ompA Expressions in ST2 and ST513 of Multidrug-Resistant Acinetobacter baumannii

(2019) Different Virulence Capabilities and ompA Expressions in ST2 and ST513 of Multidrug-Resistant Acinetobacter baumannii. Current Microbiology. pp. 723-731. ISSN 0343-8651

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Abstract

Successful clones of Acinetobacter baumannii cause a variety of nosocomial infections through serum resistance, biofilm formation, and antimicrobial resistance as virulence capabilities. Fifty clinical isolates of multidrug-resistant (MDR) A. baumannii were analyzed for clonal relatedness, serum resistance, biofilm formation, and in vivo assays. Furthermore, some virulence genes, sequence variation of ompA, and its expression were studied. The MLST (multilocus sequence typing) results showed that there were three sequence types among MDR isolates including ST2 (64, 32/50), ST513 (30, 15/50), and ST1 (6, 3/50). The data showed that the clinical isolates recovered from sputum had mostly high biofilm-formation capacity, while isolates recovered from host interior fluids had high serum resistance. The results of PCR assays and in silico analysis represented patterns of virulence genes and even ompA sequence variations among MDR isolates which were clonally dependent. While quantitative reverse transcription-polymerase chain reaction (qRT-PCR) analysis showed that bacteremia-producing strains in C57/BL6 mice significantly overexpress ompA (P<0.05) and have a direct relation with the level of IL-6 in bloodstream of mice. Moreover, the expressions of ompA among indistinguishable clones (ST2 or ST513) were clonally independent.

Item Type: Article
Keywords: molecular epidemiology biofilm pathogenesis sepsis mechanisms spread
Subjects: QW Microbiology and Immunology > QW 1-300 Microbiology
Divisions: Faculty of Medicine > Department of Basic Science > Department of Microbiology
Page Range: pp. 723-731
Journal or Publication Title: Current Microbiology
Journal Index: ISI
Volume: 76
Number: 6
Identification Number: https://doi.org/10.1007/s00284-019-01686-9
ISSN: 0343-8651
Depositing User: Zahra Otroj
URI: http://eprints.mui.ac.ir/id/eprint/9963

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