Immunogenic mapping of potential epitopes from Tc-CTL-1 for the diagnosis of murine toxocariasis
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Published on: September 30, 2010
Gabriela Rodrigues E Fonseca1,2, Ana Laura Grossi de Oliveira3, Ramayana Morais de Medeiros Brito3
1Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, Laboratório de Investigação Médica em Imunopatologia da Esquistossomose e Outras Parasitoses, São Paulo, SP, Brasil.
Background:
Toxocariasis is a neglected global zoonosis. The immunological diagnosis has setbacks that hinder further knowledge about its pathology, epidemiology, and public control measures, and lack of financial support and attention prevents innovative research. Although studies on synthetic peptides are common for several infectious pathologies, none evaluated chemically synthetic peptides for toxocariasis diagnosis.
Objective:
This study aimed to identify potential synthetic peptides from C-type lectin 1 (Tc-CTL-1) from Toxocara canis.
Methods:
In silico analyses were made by five B-cell peptide prediction programs, 3-D modelling, BLASTp homology analysis, and signal-peptide identification. SPOT-synthesis was used for epitope mapping and assessed by dot-blot. Sera from non-infected and T. canis, Strongyloides venezuelensis, Ascaris suum, or Schistosoma mansoni-infected animals were used to assess the peptide's immunogenicity and cross-reactivity. The selection of potential immunogenic epitopes included the most immunogenic peptides with the least cross-reactivity.
Findings:
Fifty-five peptides were selected by in silico analysis. Dot-blot showed intense recognition by anti-Toxocara IgG and cross-reactivity with A. suum-infected mice. Selection criteria identified four epitopes with diagnostic potential.
Main Conclusions:
The findings demonstrate that synthetic peptides should be explored for innovation of toxocariasis diagnosis, and suggest the adaptation of dot-blot using the SPOT-synthesis technique as a potential immunodiagnostic platform.
Insights
This study explored synthetic peptides from Toxocara canis C-type lectin 1 for improved toxocariasis diagnosis. Four promising epitopes were identified, suggesting a new diagnostic platform for this neglected zoonosis.
Area of Science:
- Parasitology
- Immunology
- Diagnostic Development
Background:
- Toxocariasis is a neglected global zoonosis with diagnostic challenges hindering research and control.
- Current immunological diagnostic methods for toxocariasis have limitations.
- Innovative research in toxocariasis diagnosis is hampered by a lack of funding and attention.
Purpose of the Study:
- To identify potential synthetic peptides from the C-type lectin 1 (Tc-CTL-1) of Toxocara canis for diagnostic applications.
- To evaluate the immunogenicity and specificity of these synthetic peptides.
Main Methods:
- In silico analysis using B-cell prediction programs, 3-D modeling, and homology analysis.
- SPOT-synthesis for epitope mapping and dot-blot assays for assessment.
- Evaluation of peptide immunogenicity and cross-reactivity using sera from infected and non-infected animals.
Main Results:
- Fifty-five peptides were initially selected through in silico analysis.
- Dot-blot assays revealed significant recognition by anti-Toxocara IgG antibodies.
- Four epitopes demonstrated diagnostic potential with minimal cross-reactivity.
Conclusions:
- Chemically synthetic peptides represent a promising avenue for advancing toxocariasis diagnosis.
- The SPOT-synthesis technique combined with dot-blot assays offers a potential platform for immunodiagnostics.
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