title: Pathogenic Effects of Biofilm on Pseudomonas Aeruginosa Pulmonary Infection and Its Relationship to Cytokines.
abstract: BACKGROUND An animal (Sprague-Dawley rat) model of Pseudomonas aeruginosa biofilm associated with chronic pulmonary infection in vivo was established and the effects of the biofilm on P. aeruginosa and its relationship to cytokines were investigated. MATERIAL AND METHODS Biofilm of P. aeruginosa in alginate beads and planktonic PA0725 were purified by anion-exchange chromatograph. Sprague-Dawley (SD) rats were immunized with the biofilm and then inhaled the same strain of P. aeruginosa. Anti-biofilm antibody titer was detected using the enzyme linked immunosorbent assay (ELISA) method. The cell count and differential count in the bronchoalveolar lavage fluid (BALF) were measured. The levels of cytokines (IL-17, IL-1β, MIP-2, and G-CSF) and tumor necrosis factor (TNF)-α in sera were also measured using an ELISA kit. RESULTS The sera anti-biofilm IgG antibody titer of immunized SD rats was increased significantly on the 5th and 8th days after inhalation. The IL-17 concentration was significantly higher on the 8th day after inhalation. The results indicated that when biofilm-pre-immunized rats were challenged with inhalation of PA0725 of P. aeruginosa, the biofilm acted as an antigen substance and mediated the antibody reaction of the antigen, which might cause serious airway inflammatory response and lung tissue injury. This effect may be related to IL-17. CONCLUSIONS P. aeruginosa biofilm protected the bacterium from antibiotics and might induce host immune damage in lung tissue and facilitate bacterium evading the host barrier.
authors.affiliation: Department of Respiratory Disease, First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China (mainland).
authors.forename: Shuangqi
authors.initials: S
authors.lastname: Cai
authors.affiliation: Department of Respiratory Disease, First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China (mainland).
authors.forename: Yanan
authors.initials: Y
authors.lastname: Li
authors.affiliation: Department of Respiratory Disease, First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China (mainland).
authors.forename: Ke
authors.initials: K
authors.lastname: Wang
authors.affiliation: Department of Respiratory Disease, First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China (mainland).
authors.forename: Yanling
authors.initials: Y
authors.lastname: Cen
authors.affiliation: Department of Respiratory Disease, First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China (mainland).
authors.forename: Huasong
authors.initials: H
authors.lastname: Lu
authors.affiliation: Department of Respiratory Disease, First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China (mainland).
authors.forename: Biying
authors.initials: B
authors.lastname: Dong
authors.affiliation: Department of Respiratory Disease, First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China (mainland).
authors.forename: Yiqiang
authors.initials: Y
authors.lastname: Chen
authors.affiliation: Department of Respiratory Disease, First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China (mainland).
authors.forename: Jinliang
authors.initials: J
authors.lastname: Kong
mesh_terms: D000464:Alginates / Q000494:pharmacology; D000818:Animals; D000900:Anti-Bacterial Agents / Q000627:therapeutic use; D018441:Biofilms; D001992:Bronchoalveolar Lavage Fluid / Q000737:chemistry; D016207:Cytokines / Q000378:metabolism*; D004195:Disease Models, Animal; D005620:Freund's Adjuvant / Q000494:pharmacology; D020723:Glucuronic Acid / Q000494:pharmacology; D016179:Granulocyte Colony-Stimulating Factor / Q000378:metabolism; D006603:Hexuronic Acids / Q000494:pharmacology; D020381:Interleukin-17 / Q000378:metabolism; D008297:Male; D011014:Pneumonia / Q000378:metabolism / Q000382:microbiology* / Q000628:therapy; D011552:Pseudomonas Infections; D011550:Pseudomonas aeruginosa / Q000378:metabolism / Q000472:pathogenicity / Q000502:physiology*; D011897:Random Allocation; D051381:Rats; D017207:Rats, Sprague-Dawley; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism
chemical_list: D000464:Alginates; D000900:Anti-Bacterial Agents; D016207:Cytokines; D006603:Hexuronic Acids; D020381:Interleukin-17; D014409:Tumor Necrosis Factor-alpha; D016179:Granulocyte Colony-Stimulating Factor; D020723:Glucuronic Acid; D005620:Freund's Adjuvant