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Tozzoli R.,Clinical Pathology Laboratories | Kodermaz G.,Clinical Pathology Laboratories | Villalta D.,Allergology and Immunology Unit | Bagnasco M.,University of Genua | And 2 more authors.
Autoimmunity Highlights | Year: 2010

Specific autoantibodies acting as TSH receptor agonists (TRAb) are responsible for Graves' disease (GD). In the last 30 years three generations of assay methods for the detection of TRAb have become available. The aim of this multicentre study was to evaluate the analytical sensitivity, precision and diagnostic accuracy of TRAb measurement using a new automated assay in comparison with a second-generation standard method. Methods: Serum samples from patients with GD (n=82), autoimmune thyroiditis (AIT, n=57) or hyperthyroidism (HT, n=292), from 106 healthy subjects and from 57 patients with infectious diseases were analysed using a third-generation TRAb immunoassay (anti-TSHR, RAD 120; Radim, Italy) based on the human monoclonal TSH receptor antibody M22. Results: Using a cut-off value of 1.25 mIU/l, established by ROC curve analysis, 80/82 GD patients (97.5%), 68/292 HT patients (23.2%), and 6/57AIT patients (10.5%) were TRAb-positive with the M22- based automated assay. The percentages of TRAb positivity were lower in the same patients when the measurements were done with the second-generation method (95.1%, 18.9%, 7.0%, respectively). Conclusion: The M22-based automated immunoassay shows high functional sensitivity (0.4 mIU/l) and high diagnostic specificity, is more sensitive than the standard second-generation method and is less time-consuming and labourintensive, and is therefore the up-to-date technology for TRAb detection in clinical practice. © Springer-Verlag 2010.

Pastorello E.A.,Allergology and Immunology Unit | Stafylaraki C.,Allergology and Immunology Unit | Scibilia J.,Allergology and Immunology Unit | Giuffrida M.G.,CNR Institute of Sciences of Food Production | And 7 more authors.
Journal of Agricultural and Food Chemistry | Year: 2013

Fennel allergy has been rarely reported, and the association with peach allergy has never been described. Our aim was to (i) study the correlation between symptom severity of peach and fennel and (ii) identify fennel allergens and the role of rPru p 3 antibodies in severe reactions to fennel. In 148 patients with peach allergy, we investigated 58 patients with symptoms and IgE antibodies positive to fennel. IgE to rPru p 1, 3, and 4 and rBet v 1, 2, and 4 were measured by immunoblotting, and the N-terminal amino acid sequences and relevant allergens were determined. We found significant association between severe reactions to fennel and peach (p = 0.0009). A major allergen was ∼9 kDa lipid-transfer protein (LTP), cross-reactive with Pru p 3, a 15 kDa protein identified as a pathogenesis-related protein 1 of the Bet v 1 family. In conclusion, peach and fennel severe allergic symptoms are significantly related, and LTP is a major fennel allergen. Fennel should be included in the LTP syndrome. © 2012 American Chemical Society.

Macchia D.,S. Giovanni di Dio Hospital | Melioli G.,University of Genoa | Pravettoni V.,Allergology and Immunology Unit | Nucera E.,Servizio di Allergologia | And 7 more authors.
Clinical and Molecular Allergy | Year: 2015

Food allergy has an increasing prevalence in the general population and in Italy concerns 8 % of people with allergies. The spectrum of its clinical manifestations ranges from mild symptoms up to potentially fatal anaphylactic shock. A number of patients can be diagnosed easily by the use of first- and second-level procedures (history, skin tests and allergen specific IgE). Patients with complex presentation, such as multiple sensitizations and pollen-food syndromes, frequently require a third-level approach including molecular diagnostics, which enables the design of a component-resolved sensitization profile for each patient. The use of such techniques involves specialists' and experts' skills on the issue to appropriately meet the diagnostic and therapeutic needs of patients. Particularly, educational programs for allergists on the use and interpretation of molecular diagnostics are needed. © 2015 Macchia et al.

Pastorello E.A.,Allergology and Immunology Unit | Pravettoni V.,Clinical Allergy and Immunology Unit | Farioli L.,Allergology and Immunology Unit | Primavesi L.,Clinical Allergy and Immunology Unit | And 4 more authors.
Journal of Agricultural and Food Chemistry | Year: 2010

Green beans belong to the Fabaceae family, which includes widely consumed species, such as beans, peanuts, and soybeans. In the literature, few cases have described allergic reactions upon the exposure to green bean boiling steam or ingestion. Here, we describe five patients reporting documented adverse reactions upon the ingestion of cooked green beans, and we characterize the responsible allergen. Fresh and cooked green beans were tested by a prick + prick technique. Sodium dodecyl sulfate polyacrylamide gel electrophoresis and IgE immunoblotting were performed with boiled vegetable extract, and the N-terminal sequence of the immunoreactive protein was obtained by analyzing the excised band in a protein sequencer. Immunoblotting inhibition of cooked green bean with in-house-purified peach lipid transfer protein (LTP) Pru p 3 was performed. An interesting green bean protein was chromatographically purified, tested with a pool serum, and inhibited with Pru p 3. Moreover, its molecular mass was determined by mass spectrometry. Prick + prick tests with raw and cooked green beans were positive for all of the patients. IgE immunoblotting showed that all of the patients reacted toward a unique IgE-binding protein at about 9 kDa. The obtained N-terminal sequence revealed the following amino acids: Ala-Ile-Ser-X-Gly-Qln-Val-Thr-Ser-Ser-Leu-Ala, corresponding to an LTP. A complete inhibition of the IgE binding to this protein, in both raw and purified extract, was obtained by purified peach Pru p 3, confirming previous IgE immunoblotting results. © 2010 American Chemical Society.

Mascheri A.,Allergology and Immunology Unit | Pravettoni V.,Clinical Allergy and Immunology Unit | Piantanida M.,Clinical Allergy and Immunology Unit | Stafylaraki C.,Allergology and Immunology Unit | And 5 more authors.
Journal of Investigational Allergology and Clinical Immunology | Year: 2015

Background: The role of allergens in the severity of tomato allergy symptoms has not yet been studied. Objectives: To evaluate the relationship between severe allergic reactions to peach and tomato and between tomato allergy symptoms and the pattern of IgE positivity for rPru p 1, rPru p 3, rPru p 4, rBet v 1, rBet v 2, rBet v 4, rPhl p 1, and rPhl p 12 in order to identify the role of recombinant allergens in the severity of reactions to tomato. Methods: We studied peach-allergic patients with clinical reactions to tomato by performing an open food challenge, skin prick test, and determination of serum specific IgE to tomato and to recombinant peach, birch, and grass allergens. Statistical analysis was carried out to evaluate the relationship between the severity of tomato symptoms and IgE positivity to the different allergens and to peach-induced symptoms. Results: We found a significant association between severe reactions to tomato and severe reactions to peach (P=.017) and levels of IgE to rPru p 3 (P=.029) and between mild tomato allergy symptoms and levels of IgE to rPru p 1 (P=.047), anti-rBet v 1 (P=.0414), anti-rBet v 2 (P=.0457), and Phleum pratense (P=.0022). Conclusion: We observed a significant relationship between peach and symptoms of tomato allergy. IgE positivity for rPru p 3 seems to be a surrogate biochemical marker for severe tomato allergy, whereas the presence of anti-rPru p 1 IgE may be an indicator of mild tomato allergy. © 2015 Esmon Publicidad.

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