Abstract
Background
Purified allergens with reduced IgE reactivity are required to improve the safety and efficacy of allergen-specific immunotherapy (IT).
Objective
The present study investigates the efficacy of purified cockroach allergen immunotherapy with proteolytically active and inactive Per a 10 in allergic mouse model.
Methods
Balb/c mice were sensitized intraperitoneally with cockroach extract (CE) and purified allergen Per a 10 in separate groups. Mice were treated subcutaneously with phosphate-buffered saline (PBS), CE, active and inactive Per a 10 and challenged intranasally. Antigen specific IgE, IgG1 and IgG2a in serum and cytokines IL-4, IL-13, IFN-γ, IL-10, TGF-β in bronchoalveolar lavage (BAL) fluid and spleen culture supernatant (CS) were estimated by enzyme-linked immunosorbent assay. Lung histology was analyzed by hematoxylin and eosin staining.
Results
IT with Per a 10 demonstrated significant reduction in IgE levels in serum, IL-4 levels in BAL fluid, CS, and eosinophilic infiltration in lungs than PBS-treated mice. This was associated with significantly increased IL-10 secretion in BAL fluid and CS. IT with Per a 10 effectively suppressed T-helper type 2 (Th2) response in mice sensitized with Per a 10 than CE group. Further, IT with inactive Per a 10 showed maximum reduction in systemic and airway inflammation and induced maximum IL-10 release in BAL fluid and CS than other antigens.
Conclusions
IT with Per a 10 effectively suppressed Th2 response and lung inflammation in Per a 10- or CE-sensitized mice. The beneficial effects of IT with inactive Per a 10 are more pronounced than active Per a 10.
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Abbreviations
- SIT:
-
Specific Immunotherapy
- CS:
-
Spleen culture supernatant
- EDTA:
-
Ethylenediamine tetraceticacid
- AEBSF:
-
Aminoethyl benzenesulfonyl fluoride hydrochloride
- PMSF:
-
Phenylmethylsulfonyl fluoride
- BAEE:
-
N-Benzoyl arginine ethyl ester hydrochloride
- CE:
-
Whole body cockroach extract
- w/v :
-
Weight/volume
- SDS:
-
Sodium dodecyl sulfate
- PBS:
-
Phosphate-buffered saline
- ELISA:
-
Enzyme-linked immunosorbent assay
- BAL:
-
Bronchoalveolar lavage
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Acknowledgment
One of the authors (Deepsikha) received financial assistance from Council of Scientific and Industrial Research, New Delhi, India.
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Srivastava, D., Mehta, A.K., Arora, N. et al. Proteolytically Inactive Per a 10 Allergen of Periplaneta americana Modulates Th2 Response and Enhances IL-10 in Mouse Model. J Clin Immunol 30, 426–434 (2010). https://doi.org/10.1007/s10875-009-9362-0
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DOI: https://doi.org/10.1007/s10875-009-9362-0