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Low-dose recombinant properdin provides substantial protection against Streptococcus pneumoniae and Neisseria meningitidis infection.

Abstract
Modern medicine has established three central antimicrobial therapeutic concepts: vaccination, antibiotics, and, recently, the use of active immunotherapy to enhance the immune response toward specific pathogens. The efficacy of vaccination and antibiotics is limited by the emergence of new pathogen strains and the increased incidence of antibiotic resistance. To date, immunotherapy development has focused mainly on cytokines. Here we report the successful therapeutic application of a complement component, a recombinant form of properdin (Pn), with significantly higher activity than native properdin, which promotes complement activation via the alternative pathway, affording protection against N. menigitidis and S. pneumoniae. In a mouse model of infection, we challenged C57BL/6 WT mice with N. menigitidis B-MC58 6 h after i.p. administration of Pn (100 µg/mouse) or buffer alone. Twelve hours later, all control mice showed clear symptoms of infectious disease while the Pn treated group looked healthy. After 16 hours, all control mice developed sepsis and had to be culled, while only 10% of Pn treated mice presented with sepsis and recoverable levels of live Meningococci. In a parallel experiment, mice were challenged intranasally with a lethal dose of S. pneumoniae D39. Mice that received a single i.p. dose of Pn at the time of infection showed no signs of bacteremia at 12 h postinfection and had prolonged survival times compared with the saline-treated control group (P < 0.0001). Our findings show a significant therapeutic benefit of Pn administration and suggest that its antimicrobial activity could open new avenues for fighting infections caused by multidrug-resistant neisserial or streptococcal strains.
AuthorsYoussif Mohammed Ali, Azam Hayat, Bayad Mawlood Saeed, Kashif S Haleem, Saleh Alshamrani, Hany I Kenawy, Viviana P Ferreira, Gurpanna Saggu, Anna Buchberger, Peter J Lachmann, Robert B Sim, Dimitrios Goundis, Peter W Andrew, Nicholas J Lynch, Wilhelm J Schwaeble
JournalProceedings of the National Academy of Sciences of the United States of America (Proc Natl Acad Sci U S A) Vol. 111 Issue 14 Pg. 5301-6 (Apr 08 2014) ISSN: 1091-6490 [Electronic] United States
PMID24706855 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Bacterial Vaccines
  • Recombinant Proteins
  • Properdin
Topics
  • Animals
  • Bacterial Vaccines (administration & dosage)
  • Dose-Response Relationship, Drug
  • Meningococcal Infections (microbiology, prevention & control)
  • Mice
  • Mice, Inbred C57BL
  • Neisseria meningitidis (isolation & purification)
  • Pneumococcal Infections (prevention & control)
  • Properdin (pharmacology)
  • Recombinant Proteins (pharmacology)

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