Project description:Chronic Pseudomonas biofilm infections are commonly associated in patients afflicted with cystic fibrosis (CF) leading to high degree of morbidity. In a murine tumor model we demonstrated that P. aeruginosa efficiently colonizes and forms biofilms in cancerous tissue post intra-venous injection. Several non-biofilm forming mutants have been identified and incorporated in the present study. Biofilm formation by wild type strains was evident in electron microscopy and immuno-histological studies. Efficacy of currently available CF infection treatment antibiotics such as ciprofloxacin, colistin and tobramycin were tested in this model. We found out that normal doses of these antibiotics were unable to eliminate wild type P. aeruginosa PA14. However, transposon mutants of P. aeruginosa PA14 (pqsA & Pel A) had strong influence on colonization. Subsequently high doses were effective against wild type P. aeruginosa PA14 biofilms.
Project description:P. aeruginosa PA14 mutant strain PA4496 expression in biofilm cells relative to PA14 wild-type strain expression in biofilm cells. All samples cultured in LB with glass wool
