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Endocrine, Metabolic & Immune Disorders - Drug Targets


ISSN (Print): 1871-5303
ISSN (Online): 2212-3873

Evaluation of Specific Immune Responses to BoNT/A and Tetanus Toxoid in Patients Undergoing Treatment for Neurologic Disorders

Author(s): Zaharenia Vlata, Aristidis Tsatsakis, Minas Tzagournissakis and Elias Krambovitis

Volume 12, Issue 3, 2012

Page: [268 - 273] Pages: 6

DOI: 10.2174/187153012802002893

Price: $65


Botulinum neurotoxins (BoNTs) are used in the treatment of many neurological disorders. The primary structure of BoNTs shows a high degree of homology with the tetanus neurotoxin, the toxoid of which is used as a vaccine. Because of the potential cross-reactivity between these toxins, we investigated the effects of Botulinum neurotoxin A (BoNT/A) and tetanus toxoid on peripheral blood mononuclear cells (PBMC) and the corresponding serum antibody levels, in twenty patients who had been treated with BoNT/A. We observed very low PBMC immunostimulation by BoNT/A at the tested dose (15 units/ml), as demonstrated by the low lymphocyte proliferation, and the absence of detectable antibodies cross-reacting with tetanus. However, exposure of PBMC from tetanus-sensitized patients to both neurotoxins showed that BoNT/A exerted a co stimulatory effect on tetanus-stimulated cells. Interestingly, in flow cytometry analysis, BoNT/A seemed to also alter the ratio of naïve (CD45RA) : memory/effector (CD45RO) T lymphocyte subsets, in favour of CD45RO. These preliminary data give a new insight on the potential immune crossreactivity between the two antigens. In view of the wide use of both neurotoxins, these immunotoxic effects merit a more detailed investigation.

Keywords: Antibody assay, botulinum neurotoxin (A), PBMC proliferation, tetanus neurotoxin, BoNT/A, anti-tetanus antibody levels, Pharmingen, Clostridium botulinum, neurotoxins, immunostimulation.

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