Investigation of the relationship between class-1 integrons and per-1 enzyme in ceftazidime resistant Pseudomonas aeruginosa

Abstract

Pseudomonas aeruginosa strains, especially multidrug resistant, have great of importance among nosocomial infection isolates. Production of beta lactamase is an important mechanism in gram-negative bacteria for resistance to beta-lactam antibiotics. PER-1 enzyme is derived from an extended spectrum beta-lactamase that is non-TEM, non-SHV-derived in class A and especially causes ceftazidime resistance. In this study, our aim was to investigate the relationship between CLASS-1 integrons and PER-1 enzyme in ceftazidime-resistance Pseudomonas aeruginosa. The PER-1 type beta lactamase enzyme that causes ceftazidime-resistance, determines the frequency, and detects the relationship between the enzyme and CLASS-1 integrons by PCR in 100 (one hundred) ceftazidime-resistant Pseudomonas aeruginosa (P. aeruginosa) isolated at Ondokuz Mayis University Hospital (Turkey) between 2007 and 2008. In this study, blaPER-1 was detected in 40% (40/100) of the isolates. Four principal clones, which were detected in P. aeruginosa strains were responsible for high prevalence using Random Amplified Polymorphic DNA-PCR (RAPD-PCR) methods. CLASS-1 integron was detected in 62.5% (25/40) of the PER-1 enzyme bearing strains and association between blaPER-1 and CLASS-1 integrons were shown in 2 (two) Pseudomonas aeruginosa strain. Also resistance rates of PRL antibiotic in blaPER-1 negative group was found to be significantly higher against blaPER-1 positive group, resistance rates of other antibiotics were no different between these two groups. We concluded that PER-1 enzyme is common in our hospital and their clonal diversity indicates horizontal dissemination, the association between bla PER-1 and CLASS-1 integrons can accelerate dissemination of this gene.