Background The precise mechanism involved in the acquisition of the IL‐17+ profile of γδT cells, the ligands responsible for this change, and whether this default is acquired during intrathymic maturation need to be elucidated. Objective This study aimed to evaluate whether IL‐17‐producing γδT cells are present in the airways of tolerant offspring from allergen‐sensitized mothers and the possible implication of maternal IgG in the generation of these cells. Methods Female mice were immunized or not, and the allergic response, frequency of γδT cell subsets and cytokine production of the offspring were analysed by flow cytometry. The effects of passive in vivo transfer of purified IgG were investigated in offspring. A translational approach was employed to analyse γδT cells in the thymus and PBMCs from humans. Results Maternal immunization reduced the frequency of spontaneous IL‐17‐producing γδT cells in the thymus, spleen and lung of offspring. This effect was mimicked by the in vivo treatment of females with purified IgG. IgG directly interacted with γδT cell membranes. The modulatory effect of human IgG on human infant intrathymic and adult peripheral γδT cells showed similarities to murine γδT cells, which is rarely reported in the literature. Conclusions & Clinical Relevance Together, our results reveal that IgG from potentially tolerant atopic mothers can influence offspring thymic IL‐17‐producing γδT cell maturation. Furthermore, we suggest that IgG is an unprecedented modulatory factor of murine and human γδT cells. These observations may support the future development of IgG‐based immunoregulatory therapeutic strategies.

Fundamentos: As reações alérgicas contra proteínas alimentares constituem um problema de saúde pública que tem se agravado em todo o mundo. Este tipo de reação afeta a qualidade de vida e seu tratamento implica em altos custos. Objetivos: Neste trabalho, objetivamos identificar o padrão de reatividade alérgica cutânea de indivíduos voluntários residentes na cidade de São Paulo e identificar fatores sociodemográficos que possam ter relação com este tipo de alergia. Metodologia: 35 voluntários foram submetidos ao teste cutâneo de puntura (TCP) e a um questionário sócio demográfico. Foi testada a reatividade cutânea contra alérgenos do leite, ovos, castanha, amendoim, camarão e carne suína. Principais resultados: Foi possível constatar que o alérgeno que apresentou maior frequência de reatividade foi o camarão seguido por carne suína, leite, ovo, castanha do Pará e amendoim.  Além disso, constatamos que geralmente os voluntários apresentam reatividade a apenas um alérgeno e que não tem conhecimento sobre seu potencial para desenvolver alergias alimentares. Por fim, ainda observamos que a quantidade de animais domésticos pode estar relacionada ao potencial alérgico individual. Conclusões: Em conclusão, foi possível atualizar a descrição do perfil de reatividade alérgica alimentar em indivíduos residentes na cidade de São Paulo e sugerir uma inédita relação com a quantidade de animais domésticos.

Indoor conditions contribute to allergen sensitization and multiple allergens reactivity, mainly for inhaled allergens. This study analyzes if Skin Prick Test (SPT) combined with efficient individual biomedical guidance about allergy development’s social, biological, and environmental aspects can yield a better clinical state with therapeutic implications for atopic individuals with high indoor permanence. We recruited atopic and non-atopic volunteers (clinically and in vitro diagnosed) with indoor permanence above 15 h per day and without previous SPT evaluation. The SPT and serum anti-allergen IgE analyses were performed individually in person, demonstrated, and discussed by the practitioners. Six months after, SPT and specific IgE titers determination were repeated, and a questionnaire to evaluate the effectiveness of the practitioner’s orientation was performed. After six months, 14% of atopic volunteers reported changes in their social habits, 30% said that they avoid the development of allergies clinical symptoms, and 68% reported a substantial improvement in their health after being informed mentored about their allergen reactivity. The control non-atopic group, as expected, reported no changes in social habits, the maintenance of total avoidance of allergic symptoms, and almost no improvement of their health. Reduced SPT and serum allergen-specific IgE titers were detected in the atopic individuals corroborating with questionnaire results. Our results indicated that SPT, followed by an individual and efficient discussion about the main biomedical aspects of allergy development, could exert a pronounced therapeutic role in allergy development by high indoor permanence individuals.

The term allergy has been misinterpreted, although this condition may affect more than half of the population in some countries. This study aimed to evaluate how health professionals living in the city of Sao Paulo, Brazil, understand the term allergy. Two questions were asked to participants: 1) What is an allergy? and 2) Have you ever developed or seen anyone developing allergies? To what? Data were obtained by interviewing more than 1,000 volunteers. After exclusion criteria were applied, 886 answers were analyzed, 606 from health professionals and 280 from individuals from other fields. The texts were submitted to lexical analysis and word cloud generation. As an additional control, a lexical analysis of a reference text defining the term allergy was used. Results revealed that this method yielded good knowledge of how allergy is understood and that health professionals failed to define the term with accuracy.