Journal
INFECTION AND IMMUNITY
Volume 73, Issue 12, Pages 8362-8368Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/IAI.73.12.8362-8368.2005
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Funding
- NIAID NIH HHS [U01 AI056431, U01 AI56431] Funding Source: Medline
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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.
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