The Neutralization Mechanism and Immunological Studies of Botulinum Neurotoxin

A special issue of Toxins (ISSN 2072-6651). This special issue belongs to the section "Bacterial Toxins".

Deadline for manuscript submissions: 31 July 2026 | Viewed by 787

Special Issue Editors


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Guest Editor
Department of Anesthesia, University of California, San Francisco, CA, USA
Interests: botulinum neurotoxin; bacterial toxins; recombinant antibodies; antibody engineering
Special Issues, Collections and Topics in MDPI journals

E-Mail Website
Guest Editor
Department of Anesthesia, University of California, San Francisco, CA, USA
Interests: botulinum neurotoxin; bacterial toxins; recombinant antibodies; antibody engineering
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Botulinum neurotoxins (BoNTs) comprise a structurally and functionally diverse family of proteins whose extreme potency and serotype variability continue to motivate intensive investigation into their mechanisms of neutralization. This Special Issue of Toxins, titled The Neutralization Mechanism and Immunological Studies of Botulinum Neurotoxin,” invites contributions that elucidate the structural, biochemical, and molecular determinants governing BoNT binding, internalization, enzymatic activity, and inhibition across multiple serotypes and subtypes. Topics of interest include structure–function analyses of toxin domains, epitope–paratope interactions, and conformational dynamics underlying neutralization, antibody- and non-antibody-based countermeasures, spanning diverse immunologic formats (e.g., monoclonal, oligoclonal, bispecific, polyclonal, and single-domain binders); and small-molecule or peptide inhibitors targeting receptor engagement, translocation, or metalloprotease activity. Studies on the mechanism of neutralization of BoNT for therapeutic use by anti-drug antibodies are also suitable for inclusion in this Special Issue. Studies integrating high-resolution structural methods, biophysical characterization, and functional neutralization assays are particularly encouraged, with the aim of advancing mechanistic insight and informing the rational design of next-generation BoNT therapeutics and countermeasures.

Dr. Shauna Farr-Jones
Prof. Dr. James D. Marks
Guest Editors

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Keywords

  • botulinum neurotoxin antitoxin
  • mechanism of action
  • botulinum neurotoxin neutralization mechanism

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Published Papers (1 paper)

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Research

17 pages, 2110 KB  
Article
Intradermal and Subcutaneous Botulinum Toxin Type A Injections Do Not Differ in the Induction of Neutralizing Antibody Formation
by Stefanie Honndorf, Jessica Moser and Klaus Fink
Toxins 2026, 18(6), 245; https://doi.org/10.3390/toxins18060245 - 27 May 2026
Viewed by 517
Abstract
The neurotoxin botulinum toxin type A (BoNT/A), produced by the bacteria Clostridium botulinum, is commonly injected intramuscularly (IM) for the management of chronic muscle hyperactivity, such as post-stroke spasticity. New indications such as peripheral neuropathic pain require alternative routes of BoNT/A administration, [...] Read more.
The neurotoxin botulinum toxin type A (BoNT/A), produced by the bacteria Clostridium botulinum, is commonly injected intramuscularly (IM) for the management of chronic muscle hyperactivity, such as post-stroke spasticity. New indications such as peripheral neuropathic pain require alternative routes of BoNT/A administration, such as subcutaneous (SC) or intradermal (ID). While IM BoNT/A injections may elicit anti-drug-antibodies (ADAs), their occurrence following SC or ID administration is unknown. Therefore, we investigated whether repeated SC or ID injections of 150 kDa BoNT/A can elicit ADAs in a dose-dependent manner, and whether these differ depending upon the route of administration. Mice were injected 5 times ID or SC with 150 kDa BoNT/A or, for higher doses, inactive mutant BoNT/A (DRBoNT/A) or inactivated toxoid (IA-BoNT/A). Total ADAs were analyzed by an immunoassay and the subgroup of neutralizing ADAs by an in vivo digit abduction score (DAS) assay following a challenge of 0.6 U BoNT/A IM. DRBoNT/A and IA-BoNT/A injections elicit ADAs (22.7 U/mL vs. 460.5 U/mL for ID; 4.7 U/mL vs. 339.4 U/mL for SC), while therapeutic doses of 150 kDa BoNT/A do not. Whereas mice with repeated 150 kDa BoNT/A injections at therapeutic dose show an unrestricted DAS of 3.7 (ID) or 3.4 (SC), mice injected repeatedly with 1.8 µg/kg DRBoNT/A or 500 µg/kg IA-BoNT/A show only a minimal DAS of ≤0.7, indicating a high titer of neutralizing ADAs. No differences were observed between administration routes. Accordingly, repeated ID or SC injections of pure 150 kDa BoNT/A at therapeutic doses fail to induce ADA formation in mice. On the other hand, DRBoNT/A ID injections induce higher ADA concentrations than SC, but generate similar amounts of neutralizing ADAs. IA-BoNT/A injections induce ADAs and neutralizing ADAs similarly after ID and SC injections. ADA development at intermediate BoNT/A doses can be higher after ID injection, but does not lead to differences in neutralizing ADAs. Our data demonstrate that the antibody response to botulinum toxin depends predominantly on the protein load, and less on the administration route. Full article
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