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Research Article 


Transcriptional expression of pmrB and arnA within polymyxin resistant nosocomial isolates of Pseudomonas aeruginosa

Sayani Roy, Deepjyoti Paul, Rajkumari Elizabeth, Debadatta Dhar, Atanu Chakravarty, Amitabha Bhattacharjee.


Abstract
Objective: The polymyxin group of antibiotics is considered to be one of the most effective antimicrobial agents against many serious pathogenic bacteria, but the excessive use of these antibiotics has led to the development of drug resistance among bacteria. This study was designed to characterize polymyxin-resistant P. aeruginosa and to explore the role of PmrB and arnA in resistant phenotype.
Methods: mRNA and cDNA of five selected polymyxin-resistant strains representing different MIC range; isolated under normal condition of strain growth, after treating sample/media with FeCl3 and MgCl2 alone, or after treating with FeCl3 and polymyxin antibiotic. The transcriptional expression was observed for PmrB and arnA by quantitative real time RT-PCR in reference to P. aeruginosa PAO1. The presence of plasmid mediated colistin resistance determinants mcr-1 was screened by PCR. Susceptibility of the strains was determined by disc-diffusion method and DNA fingerprinting was carried out by performing REP-PCR.
Results: A down regulated expression of PmrB and arnA was observed even after the unique induction with FeCl3 and MgCl2. All the isolates were found to be resistant against cefepime and different clonal patterns of resistance were found among the isolates.
Conclusion: This study has drawn a new insight into polymyxin resistance which will help in the detection and control of infections caused by multidrug resistant P. aeruginosa. The low susceptibility rate to aminoglycoside, piperacllin-tazobactam and ciprofloxacin was found and in addition, detection of PmrB and arnA as molecular markers in the follow up of infections caused by multidrug resistant P. aeruginosa. J Microbiol Infect Dis 2018; 8(2):61-68

Key words: arnA, mcr-1, PmrB, Polymyxin, Pseudomonas aeruginosa, Multidrug resistance


 
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How to Cite this Article
Pubmed Style

Roy S, Paul D, Elizabeth R, Dhar D, Chakravarty A, Bhattacharjee A. Transcriptional expression of pmrB and arnA within polymyxin resistant nosocomial isolates of Pseudomonas aeruginosa. J Microbiol Infect Dis. 2018; 8(2): 61-68 .

doi:10.5799/jmid.434595

Web Style

Roy S, Paul D, Elizabeth R, Dhar D, Chakravarty A, Bhattacharjee A. Transcriptional expression of pmrB and arnA within polymyxin resistant nosocomial isolates of Pseudomonas aeruginosa. https://www.jmidonline.org/?mno=302657149 [Access: June 27, 2026].

doi:10.5799/jmid.434595

AMA (American Medical Association) Style

Roy S, Paul D, Elizabeth R, Dhar D, Chakravarty A, Bhattacharjee A. Transcriptional expression of pmrB and arnA within polymyxin resistant nosocomial isolates of Pseudomonas aeruginosa. J Microbiol Infect Dis. 2018; 8(2): 61-68 .


doi:10.5799/jmid.434595

Vancouver/ICMJE Style

Roy S, Paul D, Elizabeth R, Dhar D, Chakravarty A, Bhattacharjee A. Transcriptional expression of pmrB and arnA within polymyxin resistant nosocomial isolates of Pseudomonas aeruginosa. J Microbiol Infect Dis. (2018), [cited June 27, 2026]; 8(2): 61-68 .


doi:10.5799/jmid.434595

Harvard Style

Roy, S., Paul, . D., Elizabeth, . R., Dhar, . D., Chakravarty, . A. & Bhattacharjee, . A. (2018) Transcriptional expression of pmrB and arnA within polymyxin resistant nosocomial isolates of Pseudomonas aeruginosa. J Microbiol Infect Dis, 8 (2), 61-68 .


doi:10.5799/jmid.434595

Turabian Style

Roy, Sayani, Deepjyoti Paul, Rajkumari Elizabeth, Debadatta Dhar, Atanu Chakravarty, and Amitabha Bhattacharjee. 2018. Transcriptional expression of pmrB and arnA within polymyxin resistant nosocomial isolates of Pseudomonas aeruginosa. Journal of Microbiology and Infectious Diseases, 8 (2), 61-68 .


doi:10.5799/jmid.434595

Chicago Style

Roy, Sayani, Deepjyoti Paul, Rajkumari Elizabeth, Debadatta Dhar, Atanu Chakravarty, and Amitabha Bhattacharjee. "Transcriptional expression of pmrB and arnA within polymyxin resistant nosocomial isolates of Pseudomonas aeruginosa." Journal of Microbiology and Infectious Diseases 8 (2018), 61-68 .


doi:10.5799/jmid.434595

MLA (The Modern Language Association) Style

Roy, Sayani, Deepjyoti Paul, Rajkumari Elizabeth, Debadatta Dhar, Atanu Chakravarty, and Amitabha Bhattacharjee. "Transcriptional expression of pmrB and arnA within polymyxin resistant nosocomial isolates of Pseudomonas aeruginosa." Journal of Microbiology and Infectious Diseases 8.2 (2018), 61-68 . Print.


doi:10.5799/jmid.434595

APA (American Psychological Association) Style

Roy, S., Paul, . D., Elizabeth, . R., Dhar, . D., Chakravarty, . A. & Bhattacharjee, . A. (2018) Transcriptional expression of pmrB and arnA within polymyxin resistant nosocomial isolates of Pseudomonas aeruginosa. Journal of Microbiology and Infectious Diseases, 8 (2), 61-68 .


doi:10.5799/jmid.434595

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