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Monoclonal Antibodies that Neutralize B. anthracis Protective Antigen (PA), Lethal Factor (LF) and Edema Factor (EF)

Posted Aug 31 2008 5:00pm

Description of Invention:
Anthrax, whether resulting from natural or bioterrorist-associated exposure, is a constant threat to human health. The lethality of anthrax is primarily the result of the effects of anthrax toxin, which has 3 components: a receptor-binding protein known as "protective antigen" (PA) and 2 catalytic proteins known as "lethal factor" (LF) and "edema factor" (EF). Although production of an efficient anthrax vaccine is an ultimate goal, the benefits of vaccination can be expected only if a large proportion of the population at risk is immunized. The low incidence of anthrax suggests that large-scale vaccination may not be the most efficient means of controlling this disease. In contrast, passive administration of neutralizing human or chimpanzee monoclonal antibody to a subject at risk for anthrax or exposed to anthrax could provide immediate efficacy for emergency prophylaxis against or treatment of anthrax.

Four monoclonal antibodies (mAbs) against PA, three mAbs against LF and four mAbs specific for EF of anthrax were isolated from a phage display library generated from immunized chimpanzees. Two mAbs recognizing PA (W1 and W2), two anti-LF mAbs efficiently neutralized the cytotoxicity of lethal toxin in a macrophage lysis assay. One anti-EF mAb efficiently neutralized edema toxin in cell culture. All five neutralizing mAbs protected animals from anthrax toxin challenge.

Prophylactics or therapeutics against B. anthracis.

Development Status:
Preclinical studies have been performed.

Zhaochun Chen (NIAID)
Stephen H Leppla (NIAID)
Suzanne U Emerson (NIAID)
Robert H Purcell (NIAID)
Mahtab Moayeri (NIDCR)

Patent Status:
HHS, Reference No. E-123-2007/0
PCT, Application No. PCT/US2008/054609 filed 21 Feb 2008
US, Application No. 11/793,735 filed 08 Dec 2009
PCT, Application No. PCT/US2005/046790 filed 21 Dec 2005
US, Application No. 12/528,427 filed 24 Aug 2009

Relevant Publication:
  1. Z Chen et al. Efficient neutralization of anthrax toxin by chimpanzee monoclonal antibodies against protective antigen. J Infect Dis. 2006 Mar 1;193(5):625-633. [ PubMed abs ]

Licensing Status:
Available for licensing.

Collaborative Research Opportunity:
The National Institute of Allergy and Infectious Diseases, Laboratory of Infectious Diseases is seeking statements of capability or interest from parties interested in collaborative research to further develop, evaluate, or commercialize Chimpanzee/human neutralizing monoclonal antibodies against anthrax toxins. Please contact Dr. Robert Purcell at 301-496-5090 for more information.

Infectious Diseases
Infectious Diseases - Diagnostics
Infectious Diseases - Therapeutics
Infectious Diseases - Vaccines
Infectious Diseases - Research Materials
Rare Diseases

For Additional Information Please Contact:
Peter Soukas J.D.
NIH Office of Technology Transfer
6011 Executive Blvd. Suite 325 Room 14,
Rockville, MD 20852-3804
United States
Phone: 301-435-4646
Fax: 301-402-0220

Ref No: 1580

Updated: 09/2008

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