Clinical and experimental allergy : journal of the British Society for Allergy and Clinical Immunology · 2020
Basophil activation test for Staphylococcus aureus enterotoxins in severe asthmatic patients.
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Flora Martina, Perna Francesco, Abbadessa Salvatore, Garziano Federica, Maffucci Rosalba, Maniscalco Mauro, Mollica Mariano, Pelaia Corrado, Tremante Eugenio, Maffei Marianna, Calabrese Cecilia
Аннотация
BACKGROUND: Several studies have shown an association between severe asthma and serum immunoglobulins E (IgE) against Staphylococcus aureus enterotoxins (SEs). SEs-the prototypes being types A (SEA), B (SEB) and toxic shock syndrome toxin 1 (TSST-1)-can induce both polyclonal and specific IgE responses.
OBJECTIVE: The aim of the study was to evaluate the ability of SEs to induce basophil activation in severe asthmatic patients using the basophil activation test (BAT).
METHODS: 57 severe asthmatic patients were enrolled. BAT in response to SEA, SEB and TSST-1 was performed in all patients, while serum IgE to SEA, SEB and SEC was available in 49 patients. BAT was considered positive when CD203c+ basophils to SEs were ≥5%, and the stimulation index (SI, ratio between % of CD203c+ basophils to SEs and to negative control) was >2. Two threshold values (>0.1 kU/L and >0.35 kU/L, respectively) were used to assess serum SEsIgE.
RESULTS: 36.8% of severe asthmatic patients had a BAT positive for at least one SE (BAT SEs+). Serum SEsIgE >0.35 kU/L (SEs IgE+) was associated with BAT SEs positivity. Among patients with negative skin prick test, 35% were BAT SEs+, 30% SEs IgE+, 55% BAT or IgE- SEs+. A negative correlation between SI of BAT to SEs and both clinical (ACT score) and functional parameters was observed, together with a positive correlation of BAT with asthma exacerbations.
CONCLUSIONS: The positivity of BAT for SEs in a subgroup of severe asthmatic patients further supports the pathogenic role of Staphylococcus aureus in severe asthma.
OBJECTIVE: The aim of the study was to evaluate the ability of SEs to induce basophil activation in severe asthmatic patients using the basophil activation test (BAT).
METHODS: 57 severe asthmatic patients were enrolled. BAT in response to SEA, SEB and TSST-1 was performed in all patients, while serum IgE to SEA, SEB and SEC was available in 49 patients. BAT was considered positive when CD203c+ basophils to SEs were ≥5%, and the stimulation index (SI, ratio between % of CD203c+ basophils to SEs and to negative control) was >2. Two threshold values (>0.1 kU/L and >0.35 kU/L, respectively) were used to assess serum SEsIgE.
RESULTS: 36.8% of severe asthmatic patients had a BAT positive for at least one SE (BAT SEs+). Serum SEsIgE >0.35 kU/L (SEs IgE+) was associated with BAT SEs positivity. Among patients with negative skin prick test, 35% were BAT SEs+, 30% SEs IgE+, 55% BAT or IgE- SEs+. A negative correlation between SI of BAT to SEs and both clinical (ACT score) and functional parameters was observed, together with a positive correlation of BAT with asthma exacerbations.
CONCLUSIONS: The positivity of BAT for SEs in a subgroup of severe asthmatic patients further supports the pathogenic role of Staphylococcus aureus in severe asthma.