A new experimental model to study shrimp allergy
(FIOCRUZ) Fundação Oswaldo Cruz ; Universität Heidelberg ; (UNICHRISTUS) Faculdade de Medicina do Centro Universitário Christus ; (UFBA) Universidade Federal da Bahia ; (UPE) Universidade de Pernambuco ; (UFMG) Universidade Federal de Minas Gerais ; (INCT) Instituto Nacional de Ciência e Tecnologia de Investigação em Imunologia
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Shrimp is among the most sensitizing food allergens and has been associated with many anaphylaxis reactions. However, there is still a shortage of studies that enable a systematic understanding of this disease and the investigation of new therapeutic approaches. This study aimed to develop a new experimental model of shrimp allergy that could enable the evaluation of new prophylactic treatments. BALB/c mice were subcutaneously sensitized with 100 μg of shrimp proteins of Litopenaeus vannamei adsorbed in 1 mg of aluminum hydroxide on day 0, and a booster (100 µg of shrimp proteins only) on day 14. The oral challenge protocol was based on the addition of 5 mg/ml of shrimp proteins to water from day 21 to day 35. Analysis of shrimp extract content detected at least 4 of the major allergens reported to L. vannamei. In response to the sensitization, allergic mice showed significantly enhanced IL-4 and IL-10 production in restimulated cervical draining lymph node cells. High detection of serum anti-shrimp IgE and IgG1 suggested the development of allergies to shrimp while Passive Cutaneous Anaphylaxis assay revealed an IgE-mediated response. Immunoblotting analysis revealed that Allergic mice developed antibodies to multiple antigens present in the shrimp extract. These observations were supported by the detection of anti-shrimp IgA production in intestinal lavage samples and morphometric intestinal mucosal changes. Therefore, this experimental protocol can be a tool to evaluate prophylactic and therapeutic approaches.
Nunes IV, Andrade CM, Guerra PV, Faquim Mauro EL. A new experimental model to study shrimp allergy. Immunol Lett. 2023 Jun; 260:73-80. doi:10.1016/j.imlet.2023.06.007.
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