title: Heterogeneous virulence potential and high antibiotic resistance of Pseudomonas aeruginosa strains isolated from Korean pneumonia patients.
abstract: Pseudomonas aeruginosa is an opportunistic human pathogen of clinical importance that causes airway infections in immunocompromised patients. Here, we report the virulence-associated characteristics of strains of P. aeruginosa, isolated from the sputa of 25 Korean pneumonia patients. A high degree of genomic plasticity was observed by random amplified polymorphic DNA genotype analysis, suggesting that the infections were caused by strains with diverse genomic backgrounds. Biofilm formation of each isolate was heterogeneous in terms of their relative motilities. In addition, 48% of isolates were defective in the production of 3-oxo-C(12)-HSL (PAI-1), a quorum sensing signal molecule. In these strains, PAI-1-dependent elastase production was correspondingly decreased, suggesting that a large number of strains were presumed to be quorum sensing deficient. Multidrug resistance (MDR) was seen in 56% of the isolates tested, and 44% of the MDR strains were resistant to five or more antibiotics. Taken together, our results provide additional insights into the virulence traits of P. aeruginosa clinical isolates, which will aid in treating P. aeruginosa infections in pneumonia patients.
authors.affiliation: Department of Microbiology, Yonsei University College of Medicine, Seoul, Republic of Korea.
authors.forename: Mi Young
authors.initials: MY
authors.lastname: Yoon
authors.forename: Kang-Mu
authors.initials: KM
authors.lastname: Lee
authors.forename: Seok Hoon
authors.initials: SH
authors.lastname: Jeong
authors.forename: Jungmin
authors.initials: J
authors.lastname: Kim
authors.forename: Sang Sun
authors.initials: SS
authors.lastname: Yoon
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D018441:Biofilms; D002675:Child, Preschool; D024881:Drug Resistance, Bacterial; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D010196:Pancreatic Elastase / Q000235:genetics / Q000378:metabolism; D010802:Phylogeny; D017395:Plasminogen Activator Inhibitor 1 / Q000235:genetics / Q000378:metabolism; D011014:Pneumonia / Q000382:microbiology*; D011552:Pseudomonas Infections / Q000382:microbiology*; D011550:Pseudomonas aeruginosa / Q000145:classification / Q000235:genetics / Q000302:isolation & purification / Q000472:pathogenicity*; D056910:Republic of Korea; D014774:Virulence; D037521:Virulence Factors / Q000235:genetics / Q000378:metabolism
chemical_list: D000900:Anti-Bacterial Agents; D017395:Plasminogen Activator Inhibitor 1; D037521:Virulence Factors; D010196:Pancreatic Elastase
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