Article: Effect of temperature on the shift of Pseudomonas fluorescens from an environmental microorganism to a potential human pathogen.
International journal of immunopathology and pharmacology
2010 Volume 23, Issue 1, Page(s) 227–234
Abstract: Pseudomonas fluorescens is a Gram-negative bacterium generally considered of scarce clinical significance. However, in the last few years, the isolation of P. fluorescens as the causative agent of nosocomial infections has rapidly increased. P. ... ...
Abstract | Pseudomonas fluorescens is a Gram-negative bacterium generally considered of scarce clinical significance. However, in the last few years, the isolation of P. fluorescens as the causative agent of nosocomial infections has rapidly increased. P. fluorescens is a psychrophile microorganism which grows at an optimal temperature of 25-30 degrees Celcius. In spite of this constraint, it has recently been reported that the human physiological temperature does not appear to be a barrier for this microorganism. In this study we examined the ability of P. fluorescens, grown at 28 degrees C or at 37 degrees C, to adhere to cultured human A549 pulmonary cells and to form biofilm. The ability of P. fluorescens to induce expression of proinflammatory cytokines, beta-defensin 2 and the intercellular adhesion molecule-1 was also investigated. Our results clearly indicate that inflammatory mediators are induced when the microorganism is grown at a lower temperature, while biofilm is formed only at 37 degrees C. The results presented are consistent with previous reports indicating P. fluorescens as an opportunistic pathogen and underscore the urgent need for further studies to better characterize the virulence of this microorganism. |
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MeSH term(s) | Bacterial Adhesion ; Biofilms ; Cell Line ; Cytokines/biosynthesis ; Humans ; Intercellular Adhesion Molecule-1/biosynthesis ; Pseudomonas fluorescens/pathogenicity ; Pseudomonas fluorescens/physiology ; Temperature ; beta-Defensins/biosynthesis |
Chemical Substances | Cytokines ; DEFB4A protein, human ; beta-Defensins ; Intercellular Adhesion Molecule-1 (126547-89-5) |
Language | English |
Publishing date | 2010-01 |
Publishing country | England |
Document type | Journal Article |
ZDB-ID | 645171-8 |
ISSN | 2058-7384 ; 0394-6320 |
ISSN (online) | 2058-7384 |
ISSN | 0394-6320 |
DOI | 10.1177/039463201002300120 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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