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Analysis of T-cell epitopes of Der f3 in Dermatophagoides farina
Na Li1, Haifeng Xu2, Hongyu Song1
1Department of Medical Parasitology, Wannan Medical University Wuhu 241002, Anhui, China.
Abstract:
House dust mites (HDM) are most important indoor allergens for humans. Der f3, one of the potent allergens with allergenicity, is derived from Dermatophagoides farina (D. farinae), and exhibits strong allergenicity that was confirmed in our previous work. The current study was undertaken to determine the localization of T-cell epitope of Der f3. We initially developed the T-cell fraction from BALB/c mice sensitized with recombinant Der f3 to determine the T-cell epitopes in the murine models, and performed T cell proliferation assay with 25 synthetic overlapping peptides of Der f3. The results indicated that T-cell reactive region of murine were assigned on amino acid range 41-60, 101-120, 161-180 and 201-220, respectively. In addition, we did T-cell proliferation experiment, respectively using the 4 murine T-cell epitope peptide and the human T-cell lines from three patients allergic to mite allergens in order to verify homogenous T-cell epitopes in humans. The results indicated that the amino acid sequences of 41-60, 101-120 and 161-180 had induced T cell proliferation in humans, yet 201-220 failed to. These findings suggest that T-cell epitope in Der f3 is located in the amino acid sequences of 41-60, 101-120 and 161-180, respectively. T-cell epitope localization detected in our study may provide a basis for development of animal therapeutic model and peptide vaccine for asthma.
Insights
This study identified key T-cell epitopes in the Der f3 allergen from house dust mites (HDM). These findings pinpoint specific Der f3 regions responsible for allergic reactions, aiding in asthma vaccine development.
Area of Science:
- Immunology
- Allergology
- Molecular Biology
Background:
- House dust mites (HDM) are a primary source of indoor allergens.
- Der f3, a potent allergen from Dermatophagoides farina, is implicated in human allergic responses.
- Understanding allergen T-cell epitopes is crucial for developing targeted therapies.
Purpose of the Study:
- To determine the precise localization of T-cell epitopes within the Der f3 allergen.
- To investigate the potential for cross-reactivity of murine-identified epitopes in human allergic individuals.
- To lay the groundwork for novel asthma treatments and vaccine strategies.
Main Methods:
- Induction of T-cell responses in BALB/c mice using recombinant Der f3.
- Peptide mapping using a T-cell proliferation assay with 25 overlapping synthetic peptides.
- Validation of identified murine T-cell epitopes using human T-cell lines from allergic patients.
Main Results:
- Murine T-cell proliferation assays identified reactive regions in Der f3 at amino acid ranges 41-60, 101-120, 161-180, and 201-220.
- Human T-cell lines showed proliferation in response to peptides corresponding to amino acid sequences 41-60, 101-120, and 161-180.
- The T-cell epitope at 201-220 did not induce proliferation in human T-cell lines.
Conclusions:
- The T-cell epitopes of Der f3 in humans are localized to amino acid sequences 41-60, 101-120, and 161-180.
- These identified epitopes provide a foundation for developing animal models for allergy research.
- The findings support the potential development of a Der f3-based peptide vaccine for asthma.
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