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Monoclonal and polyclonal antibodies against dendrotoxin: Their effects on its convulsive activity and interaction

F Mehraban1, A Haines, J O Dolly

  • 1Department of Biochemistry, Imperial College, London SW7 2AZ, U.K.

Neurochemistry International
|May 25, 2010
PubMed

Insights

Monoclonal antibodies targeting dendrotoxin, a convulsant polypeptide, effectively blocked its binding to brain receptors and prevented neurotoxic effects. These antibodies offer insights into dendrotoxin

Area of Science:

  • Neuroscience
  • Immunology
  • Biochemistry

Background:

  • Dendrotoxin is a convulsant polypeptide neurotoxin.
  • Understanding dendrotoxin's mechanism of action and receptor interactions is crucial for studying neurotoxicity.

Purpose of the Study:

  • To develop and characterize monoclonal antibodies against dendrotoxin.
  • To investigate the antibodies' ability to neutralize dendrotoxin's neurotoxic effects and binding to its brain receptor.

Main Methods:

  • Generation of hybridoma cell lines secreting monoclonal antibodies to dendrotoxin.
  • Radioimmunoassay using radiolabeled dendrotoxin to assess antibody specificity and cross-reactivity.
  • In vivo studies involving intracerebroventricular injection in rats to evaluate antibody efficacy in preventing convulsions.
  • Ultracentrifugation to analyze antibody-antigen complex formation and epitope mapping.

Main Results:

  • Established three hybrid cell lines producing G(1) subclass monoclonal antibodies against dendrotoxin.
  • Monoclonal antibodies showed no cross-reactivity with related toxins but recognized specific epitopes on dendrotoxin.
  • Antibodies significantly inhibited dendrotoxin binding to synaptic membrane receptors and protected against lethal doses, delaying or preventing convulsions.
  • Ultracentrifugation indicated monoclonal antibodies target a single or overlapping epitope, while polyclonal antibodies identified multiple determinants.

Conclusions:

  • The developed monoclonal antibodies are highly specific tools for studying dendrotoxin.
  • These antibodies neutralize dendrotoxin's neurotoxicity by blocking its interaction with neuronal receptors.
  • The findings aid in identifying dendrotoxin regions responsible for neurotoxicity and receptor interaction, potentially related to K(+)-channels.

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