OBJECTIVE: To determine whether Pseudomonas aeruginosa, a common cholesteatoma pathogen, known to form biofilms in other chronic infections, is capable of contributing to biofilm formation in cholesteatoma. DESIGN: We tested 12 OPPA isolates for several aspects of biofilm formation, including adherence to human keratinocytes, expression of quorum-sensing genes, twitching motility, and production of extracellular matrix as determined by both crystal violet staining and carbazole reaction. RESULTS: Ten OPPA strains demonstrated increased adherence (1.5- to 12-fold) to human keratinocytes relative to PAO1, a laboratory strain. Expression of las and rhl quorum-sensing products were detected in 11 OPPA strains. By crystal violet staining, we found biofilm formation in all OPPA strains equal to or greater than that found in PAO1 (2- to 18-fold). In addition, OPPA strains demonstrated mucoid characteristics, including down-regulation of twitching motility and increased alginate production. CONCLUSIONS: Strains of OPPA isolated from cholesteatoma are strongly adherent to keratinocytes and capable of forming biofilm. In addition, OPPA strains have mucoid characteristics in vitro. When these bacteria assume a biofilm phenotype, they are highly resistant to antibiotics and host defenses. These data suggest that OPPA can contribute to biofilm formation in cholesteatoma, leading to the persistence of this infection.
OBJECTIVE: To determine whether Pseudomonas aeruginosa, a common cholesteatoma pathogen, known to form biofilms in other chronic infections, is capable of contributing to biofilm formation in cholesteatoma. DESIGN: We tested 12 OPPA isolates for several aspects of biofilm formation, including adherence to human keratinocytes, expression of quorum-sensing genes, twitching motility, and production of extracellular matrix as determined by both crystal violet staining and carbazole reaction. RESULTS: Ten OPPA strains demonstrated increased adherence (1.5- to 12-fold) to human keratinocytes relative to PAO1, a laboratory strain. Expression of las and rhl quorum-sensing products were detected in 11 OPPA strains. By crystal violet staining, we found biofilm formation in all OPPA strains equal to or greater than that found in PAO1 (2- to 18-fold). In addition, OPPA strains demonstrated mucoid characteristics, including down-regulation of twitching motility and increased alginate production. CONCLUSIONS: Strains of OPPA isolated from cholesteatoma are strongly adherent to keratinocytes and capable of forming biofilm. In addition, OPPA strains have mucoid characteristics in vitro. When these bacteria assume a biofilm phenotype, they are highly resistant to antibiotics and host defenses. These data suggest that OPPA can contribute to biofilm formation in cholesteatoma, leading to the persistence of this infection.
Authors: J Galli; L Calò; F Ardito; M Imperiali; E Bassotti; G Fadda; G Paludetti Journal: Acta Otorhinolaryngol Ital Date: 2007-06 Impact factor: 2.124
Authors: Alison A Jack; Saira Khan; Lydia C Powell; Manon F Pritchard; Konrad Beck; Hina Sadh; Lucy Sutton; Alessandra Cavaliere; Hannah Florance; Philip D Rye; David W Thomas; Katja E Hill Journal: Antimicrob Agents Chemother Date: 2018-04-26 Impact factor: 5.191
Authors: Jae Y Jung; Dong H Lee; Eric W Wang; Robert Nason; Toni M Sinnwell; Joseph P Vogel; Richard A Chole Journal: Laryngoscope Date: 2011-11 Impact factor: 3.325
Authors: Eric W Wang; Gabriela Agostini; Osarenoma Olomu; Daniel Runco; Jae Y Jung; Richard A Chole Journal: Laryngoscope Date: 2008-11 Impact factor: 3.325