Oscar Alberto Solis-Velazquez1, Melesio Gutiérrez-Lomelí2, Pedro Javier Guerreo-Medina2, María de Lourdes Rosas-García1, Maricarmen Iñiguez-Moreno3, María Guadalupe Avila-Novoa4. 1. Laboratorio de Microbiología, Departamento de Ciencias Médicas y de la Vida, Centro Universitario de la Ciénega, Universidad de Guadalajara, Jalisco, Mexico. 2. Laboratorio de Alimentos, Departamento de Ciencias Médicas y de la Vida, Centro Universitario de la Ciénega, Universidad de Guadalajara, Jalisco, Mexico. 3. Instituto Tecnológico de Tepic, Tecnológico Nacional de México, Nayarit, Mexico. 4. Laboratorio de Microbiología, Departamento de Ciencias Médicas y de la Vida, Centro Universitario de la Ciénega, Universidad de Guadalajara, Jalisco, Mexico. Electronic address: avila.novoa@cuci.udg.mx.
Abstract
BACKGROUND/PURPOSE (S): Nosocomial pathogens can develop biofilms on hospital surfaces and medical devices; however, few studies have focused on the evaluation of mono-and dual-species biofilms developed by nosocomial pathogens under different growth conditions. METHODS: This study investigated biofilm development by nosocomial pathogens (Acinetobacter baumannii, Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa) on biomaterials in different culture media and their components of the extracellular matrix biofilm. RESULTS: The mono-species biofilms showed cell densities from 7.50 to 9.27 Log10 CFU/cm2 on natural rubber latex type I (NLTI) and from 7.58 to 8.79 Log10 CFU/cm2 on stainless steel (SS). Dual-species biofilms consisted of S. aureus + P. aeruginosa (7.87-8.27 Log10 CFU/cm2 in TSBP and TSBME onto SS; p < 0.05), E. coli + P. aeruginosa (8.32-8.86 Log10 CFU/cm2 in TSBME onto SS and TSBP onto NLTI; p < 0.05), and S. aureus + E. coli (7.82 Log10 CFU/cm2 in TSBME onto SS; p < 0.05). Furthermore, biofilm detachment after proteinase K treatment was 5.54-32.81% compared to 7.95-24.15% after DNase I treatment in the mono-dual species biofilm matrix. Epifluorescence microscopy and scanning electron microscopy (SEM) enabled visualizing the bacteria and extracellular polymeric substances of biofilms on SS and NLTI. CONCLUSION: Nosocomial pathogens can develop biofilms on biomaterials. Mono-species biofilms of Gram-negative bacteria showed lower densities than dual-species biofilms in TSBME and TSBP. Additionally, dual-species biofilms showed a higher concentration of proteins and eDNA in the extracellular matrix.
BACKGROUND/PURPOSE (S): Nosocomial pathogens can develop biofilms on hospital surfaces and medical devices; however, few studies have focused on the evaluation of mono-and dual-species biofilms developed by nosocomial pathogens under different growth conditions. METHODS: This study investigated biofilm development by nosocomial pathogens (Acinetobacter baumannii, Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa) on biomaterials in different culture media and their components of the extracellular matrix biofilm. RESULTS: The mono-species biofilms showed cell densities from 7.50 to 9.27 Log10 CFU/cm2 on natural rubber latex type I (NLTI) and from 7.58 to 8.79 Log10 CFU/cm2 on stainless steel (SS). Dual-species biofilms consisted of S. aureus + P. aeruginosa (7.87-8.27 Log10 CFU/cm2 in TSBP and TSBME onto SS; p < 0.05), E. coli + P. aeruginosa (8.32-8.86 Log10 CFU/cm2 in TSBME onto SS and TSBP onto NLTI; p < 0.05), and S. aureus + E. coli (7.82 Log10 CFU/cm2 in TSBME onto SS; p < 0.05). Furthermore, biofilm detachment after proteinase K treatment was 5.54-32.81% compared to 7.95-24.15% after DNase I treatment in the mono-dual species biofilm matrix. Epifluorescence microscopy and scanning electron microscopy (SEM) enabled visualizing the bacteria and extracellular polymeric substances of biofilms on SS and NLTI. CONCLUSION: Nosocomial pathogens can develop biofilms on biomaterials. Mono-species biofilms of Gram-negative bacteria showed lower densities than dual-species biofilms in TSBME and TSBP. Additionally, dual-species biofilms showed a higher concentration of proteins and eDNA in the extracellular matrix.
Authors: Marta Woroszyło; Daria Ciecholewska-Juśko; Adam Junka; Marcin Wardach; Grzegorz Chodaczek; Bartłomiej Dudek; Karol Fijałkowski Journal: Int J Mol Sci Date: 2021-10-26 Impact factor: 5.923
Authors: Marta Woroszyło; Daria Ciecholewska-Juśko; Adam Junka; Radosław Drozd; Marcin Wardach; Paweł Migdał; Patrycja Szymczyk-Ziółkowska; Daniel Styburski; Karol Fijałkowski Journal: Int J Mol Sci Date: 2021-11-17 Impact factor: 5.923