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Anthrax toxin: structures, functions and tumour targeting

Shihui Liu1, Rebecca L Schubert, Thomas H Bugge

  • 1Microbial Pathogenesis Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA. shliu@niaid.nih.gov

Expert Opinion on Biological Therapy
|July 26, 2003
PubMed

Insights

Anthrax toxin

Area of Science:

  • Molecular Biology
  • Toxicology
  • Cancer Research

Background:

  • Bacillus anthracis secretes anthrax toxin, a key virulence factor comprising protective antigen (PrAg), lethal factor (LF), and edema factor (EF).
  • PrAg facilitates cellular entry of LF and EF, leading to cytotoxic effects via MAPKK inactivation.
  • Recent advancements in understanding anthrax toxin structure and function aid in developing antianthrax agents and exploring its therapeutic potential.

Purpose of the Study:

  • To investigate the potential of anthrax toxin, particularly lethal factor (LF), as a therapeutic agent for cancer treatment.
  • To explore modifications of protective antigen (PrAg) for targeted delivery and enhanced efficacy in cancer therapy.
  • To evaluate the antitumour effects of modified anthrax toxin on specific cancer types.

Main Methods:

  • Characterization of anthrax toxin structure and function.
  • Investigating the mechanism of lethal factor (LF) in inactivating mitogen-activated protein kinase kinases (MAPKKs).
  • Modifying the proteolytic activation site of protective antigen (PrAg) to alter its cleavage specificity.

Main Results:

  • Lethal factor (LF) effectively inactivates MAPKKs, demonstrating antitumour effects in certain cancers like human melanomas.
  • Altering the furin cleavage site of PrAg enables activation by tumour-specific proteases (e.g., MMPs, urokinase).
  • Modified anthrax toxin exhibits targeted cytotoxicity, limiting effects to specific cell types.

Conclusions:

  • Anthrax toxin, especially LF, holds promise for cancer therapy by targeting MAPK-dependent tumours.
  • Modifying PrAg's activation site offers a versatile strategy for targeted cancer treatment.
  • Tumour-specific protease activation of modified anthrax toxin enhances therapeutic potential and reduces off-target effects.

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