Hyperencapsulated mucoid pneumococcal isolates from patients with cystic fibrosis have increased biofilm density and persistence in vivo. Issue 7 (28th September 2018)

• Record Type: Journal Article
• Authors: Dennis, Evida A; Coats, Mamie T; Griffin, Sarah; Pang, Bing; Briles, David E; Crain, Marilyn J; Swords, W Edward
• Is Part Of: Pathogens and disease. Volume 76:Issue 7(2018)
• Publication Date: 2018-09-28
• Subjects: Streptococcus pneumoniae -- cystic fibrosis -- biofilm -- mucoid -- serotype -- type 3 capsule; Medical microbiology -- Periodicals; Pathogenic microorganisms -- Periodicals; Communicable diseases -- Microbiology -- Periodicals; Communicable diseases -- Pathogenesis -- Periodicals; Host-parasite relationships -- Periodicals; Systems biology -- Periodicals; 616.904105
• DOI: 10.1093/femspd/fty073
• Languages: English
• ISSNs: 2049-632X

Abstract

Abstract: Mucoid bacteria, predominately Pseudomonas aeruginosa, are commonly associated with decline in pulmonary function in children with cystic fibrosis (CF), and are thought to persist at least in part due to a greater propensity toward forming biofilms. We isolated a higher frequency of mucoid Streptococcus pneumoniae (Sp) expressing high levels of capsular polysaccharides from sputa from children with CF, compared to those without CF. We compared biofilm formation and maturation by mucoid and non-mucoid isolates of Sp collected from children with and without CF. Non-mucoid Sp serotype 19A and 19F isolates had significantly higher levels of biofilm initiation and adherence to CF epithelial cells than did serotype 3 isolates. However, strains expressing high levels of capsule had significantly greater biofilm maturation, as evidenced by increased density and thickness in static and continuous flow assays via confocal microscopy. Finally, using a serotype 3 Sp strain, we showed that highly encapsulated mucoid phase variants predominate during late adherence and better colonize CFTR –/– as compared to wild-type mice in respiratory infection studies. These findings indicate that overexpression of capsule can enhance the development of mature pneumococcal biofilms in vitro, and may contribute to pneumococcal colonization in CF lung disease. Abstract : Mucoid Streptococcus pneumonia were collected more frequency from children with cystic fibrosis (CF) compared to children without CF, and enhanced the development of mature pneumococcal biofilms, thus may contribute to bacterial colonization in CF lung disease.