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Human response to botulinum toxin injection: type B compared with type A

R R Sloop1, B A Cole, R O Escutin

  • 1Department of Neurology, Loma Linda University School of Medicine, CA 92354, USA.

Neurology
|July 1, 1997
PubMed
Summary

Botulinum toxin type B (BTXB) causes less complete and shorter-lasting muscle paralysis than botulinum toxin type A (BTXA) in humans. This study objectively compared the effects of BTXB and BTXA on muscle paralysis, finding BTXA to be more potent and enduring.

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Area of Science:

  • Neurology
  • Pharmacology
  • Biophysics

Background:

  • Botulinum toxin type B (BTXB) shows clinical promise for movement disorders, especially for patients resistant to botulinum toxin type A (BTXA).
  • Objective human data comparing the muscle paralysis induced by BTXB and BTXA were lacking.
  • Understanding the comparative efficacy and duration of these toxins is crucial for clinical application.

Purpose of the Study:

  • To objectively compare the extent and duration of human muscle paralysis induced by intramuscular injections of BTXB versus BTXA.
  • To establish dose-response curves for BTXB and compare them with existing BTXA data.
  • To evaluate the recovery of muscle function after administration of both toxin types.

Main Methods:

  • Healthy volunteers received intramuscular injections of various doses of BTXB or BTXA in the extensor digitorum brevis (EDB) muscle.

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  • Muscle paralysis was quantified by measuring the EDB M wave amplitude before and at multiple time points after injection.
  • Dose-response curves were generated, and paralysis was expressed as percent decline in M wave amplitude (% paralysis).

    • Main Results:

    • Maximal paralysis with 320–480 mouse units (MU) of BTXB was 50–75%, compared to 70–80% with 7.5–10 MU of BTXA.
    • Postexercise M wave facilitation was significantly higher for BTXB (63%) than for BTXA (20%) at 9 days postinjection.
    • BTXB-induced paralysis improved by 66% within 7 weeks, with complete recovery by 11 weeks; BTXA-induced paralysis showed only 6% improvement at 7 weeks, with 22% remaining at 57 weeks.

    Conclusions:

    • Human muscle paralysis induced by BTXB is less complete than that induced by BTXA.
    • The duration of muscle paralysis is significantly shorter for BTXB compared to BTXA.
    • BTXA demonstrates greater potency and longer-lasting effects in inducing human muscle paralysis than BTXB.