Passive protection against anthrax by using a high-affinity antitoxin antibody fragment lacking an Fc region

Robert Mabry, Mridula Rani, Robert Geiger, Gene B. Hubbard, Ricardo Carrion, Kathleen Brasky, Jean L. Patterson, George Georgiou, B. L. Iverson

    Research output: Contribution to journalArticlepeer-review

    53 Scopus citations

    Abstract

    Passive immunization has been successfully employed for protection against bacterial and viral infections For over 100 years. Immunoglobulin Fc regions play a critical role in the clearance of bacterial pathogens by mediating antibody-dependent and complement-dependent cytotoxicity. Here we show that antibody fragments engineered to recognize the protective antigen component of the B. anthracis exotoxin with high affinity and conjugated to polyethylene glycol (PEG) for prolonged circulation half-life confer significant protection against inhalation anthrax despite their lack of Fc regions. The speed and lower manufacturing cost of bacterially expressed PEGylated antibody fragments could provide decisive advantages for anthrax prophylaxis. Importantly, our results suggest that PEGylated antibody fragments may represent a unique approach for mounting a rapid therapeutic response to emerging pathogen infections.

    Original languageEnglish (US)
    Pages (from-to)8362-8368
    Number of pages7
    JournalInfection and immunity
    Volume73
    Issue number12
    DOIs
    StatePublished - Dec 2005

    ASJC Scopus subject areas

    • Parasitology
    • Microbiology
    • Immunology
    • Infectious Diseases

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