Collagen VI Is Upregulated in COPD and Serves Both as an Adhesive Target and a Bactericidal Barrier for Moraxella catarrhalis.

Summary, in English

Moraxella catarrhalis is a Gram-negative human mucosal commensal and pathogen. It is a common cause of exacerbation in chronic obstructive pulmonary disease (COPD). During the process of infection, host colonization correlates with recognition of host molecular patterns. Importantly, in COPD patients with compromised epithelial integrity the underlying extracellular matrix is exposed and provides potential adhesive targets. Collagen VI is a ubiquitous fibrillar component in the airway mucosa and has been attributed both adhesive and killing properties against Gram-positive bacteria. However, less is known regarding Gram-negative microorganisms. Therefore, in the present study, the interaction of M. catarrhalis with collagen VI was characterized. We found that collagen VI is upregulated in the airways of COPD patients and exposed upon epithelial desquamation. Ex vivo, we inoculated airway biopsies and fibroblasts from COPD patients with M. catarrhalis. The bacteria specifically adhered to collagen VI-containing matrix fibrils. In vitro, purified collagen VI microfibrils bound to bacterial surface structures. The primary adhesion target was mapped to the collagen VI α2-chain. Upon exposure to collagen VI, bacteria were killed by membrane destabilization in physiological conditions. These previously unknown properties of collagen VI provide novel insights into the extracellular matrix innate immunity by quickly entrapping and killing pathogen intruders. © 2015 S. Karger AG, Basel.

• Författare: Suado M Abdillahi; Marta Bober; Sara Nordin; Oskar Hallgren; Maria Baumgarten; Jonas Erjefält; Gunilla Westergren-Thorsson; Leif Bjermer; Kristian Riesbeck; Arne Egesten; Matthias Mörgelin
• Avdelning/ar: Infektionsmedicin; Lungmedicin, allergologi och palliativ medicin; Lungbiologi; Luftvägsinflammation; Klinisk mikrobiologi, Malmö; EpiHealth: Epidemiology for Health
• Publiceringsår: 2015
• Språk: Engelska
• Sidor: 506-517
• Publikation/Tidskrift/Serie: Journal of Innate Immunity
• Volym: 7
• Issue: 5
• Länkar: http://www.ncbi.nlm.nih.gov/pubmed/25925694?dopt=Abstract; http://dx.doi.org/10.1159/000381213
• Dokumenttyp: Artikel i tidskrift
• Förlag: Karger
• Ämne: Immunology in the medical area
• Status: Published
• Forskningsgrupp: Lung Biology; Airway Inflammation and Immunology; Clinical Microbiology, Malmö
• ISBN/ISSN/Övrigt: ISSN: 1662-811X