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1.
Mol Immunol ; 132: 150-156, 2021 04.
Artigo em Inglês | MEDLINE | ID: mdl-33592570

RESUMO

INTRODUCTION: Pollens are an important source of allergens that trigger rhinitis or asthma. The allergenic extracts of pollens used to diagnose and treat allergies contain different allergenic antigens. Isolated allergenic proteins are employed in in vitro assays, skin tests and allergenic-specific immunotherapy. Calcium-binding allergens are clinically relevant antigens, and their allergenicity can be affected by Ca2+ binding. In this work, a calmodulin was identified as an allergen from Amaranthus palmeri pollen, an important source of pollinosis in Europe, Asia and North America. MATERIALS AND METHODS: Allergenic calmodulin from A. palmeri pollen was isolated by size-exclusion chromatography and reverse-phase chromatography and identified by mass spectrometry. Sensitization to isolated calmodulin was evaluated by skin prick tests in patients with allergy to A. palmeri pollen. RESULTS: Size-exclusion chromatography yielded two fractions that were recognized by the IgE of patients allergic to A. palmeri pollen. Mass spectrometry analysis of the fractions from reverse-phase chromatography showed peptide sequences that identified a calmodulin. Skin prick tests showed that the isolated calmodulin was recognized by 56% of patients allergic to A. palmeri pollen. CONCLUSION: A. palmeri pollen calmodulin could be a clinically relevant allergen in patients sensitized to this source.


Assuntos
Alérgenos/imunologia , Amaranthus/imunologia , Antígenos de Plantas/imunologia , Calmodulina/imunologia , Pólen/imunologia , Sequência de Aminoácidos , Ásia , Asma/imunologia , Europa (Continente) , Humanos , Imunoglobulina E/imunologia , América do Norte , Rinite Alérgica Sazonal/imunologia , Testes Cutâneos/métodos
2.
Rev Alerg Mex ; 63(4): 342-350, 2016.
Artigo em Espanhol | MEDLINE | ID: mdl-27795214

RESUMO

BACKGROUND: Adverse reactions to drugs are increasing and there are few studies for the diagnosis. OBJECTIVE: To determine the utility of modified basophil degranulation (MBD) test and modified leukocyte migration inhibition factor (MLMIF) test to prove drug hypersensitivity. METHODS: 177 patients of both sexes were studied with the diagnosis of drug hypersensitivity, determining MBD, MLMIF, or both, between 2009 and 2014. They were matched with positive and negative controls and the non-allergic population. Applications are issued according to the type of hypersensitivity, considering type I MBD and type IV MLMIF. RESULTS: 170 patients (96.04%) were positive to at least one drug (RR = 4.71). 561 MBD (73.62%) and 201 MLMIF (26.37%) were performed. Female sex was more frequent (64.41%); the average age was 38.5. MBD was positive in 70.23% and MLMIF in 67.16%. The test sensitivity was increased complementarily and with two dilutions. The correlation of MBD and MLMIF was positive and highly significant. CONCLUSIONS: Women have more drug reactions. Modified MBD test is useful at any age. Since medications can activate one or other hypersensitivity mechanism, it is important to request the tests simultaneously.


Antecedentes: Existe incremento de reacciones adversas a medicamentos y pocos estudios para el diagnóstico. Objetivo: Determinar la utilidad de pruebas modificadas de degranulación de basófilos (DB) y del factor inhibidor de la migración de leucocitos (LIF, leukocyte migration inhibition factor) para comprobar la hipersensibilidad a medicamentos. Métodos: Se estudiaron 177 pacientes, de uno y otro sexo, con diagnóstico de hipersensibilidad a medicamentos, en quienes se determinó pruebas modificadas de DB, LIF, o ambas entre 2009 y 2014. Se parearon con controles positivos, negativos y población no alérgica. Las solicitudes se emitieron de acuerdo con el tipo de hipersensibilidad, considerando tipo I a DB y tipo IV a LIF Resultados: 170 pacientes (96.04%) fueron positivos al menos a un medicamento (RR, 4.71). Se realizaron 561 pruebas modificadas de DB (73.62%) y 201 de LIF (26.37%). El sexo femenino fue más frecuente (64.41%); la edad promedio fue de 38.5 años. La prueba modificada de DB resultó positiva en 70.23% y la de LIF en 67.16%. La sensibilidad de las pruebas se incrementó en forma complementaria y a dos diluciones. La correlación de las pruebas fue altamente significativa. Conclusiones: Las mujeres presentan más reacciones a fármacos. La prueba modificada de DB es útil en cualquier edad. Como los medicamentos pueden activar uno u otro mecanismo de hipersensibilidad es importante solicitar las pruebas simultáneamente.


Assuntos
Teste de Degranulação de Basófilos/métodos , Hipersensibilidade a Drogas/diagnóstico , Fatores Inibidores da Migração de Leucócitos/análise , Adulto , Hipersensibilidade a Drogas/imunologia , Feminino , Humanos , Masculino , Testes Cutâneos
3.
Rev Alerg Mex ; 62(3): 175-81, 2015.
Artigo em Espanhol | MEDLINE | ID: mdl-26239326

RESUMO

BACKGROUND: Chronic spontaneous urticaria (CSU) is a common condition in adults, especially among women; this entity is frequently associated with autoimmune diseases. Our goal is to assess through laboratory studies whether patients with autoimmune CSU presented data. MATERIAL AND METHOD: A cross-sectional study of 35 patients was done in the area of Allergy and Immunology at Hospital Juarez de Mexico diagnosed with CSU. We performed the following tests: complete blood count, thyroid antibodies (antiperoxidase and thyroglobulin), antinuclear antibodies, rheumatoid factor, lupus anticoagulant, LE cells Autologous Serum Skin Test (ASST), add (C3 and C4). In addition, we made Helicobacter pylori test, thyroid hormones (T3, T4, TSH) and D-dimer. RESULTS: We evaluated 35 adult patients, 27 female; ASST was positive in 4 patients, negative antinuclear antibodies in all cases, but positive anti thyroid (AAT) antibodies in 4. The LE cell, lupus anticoagulant, complement, dimer D, thyroid and Helicobacter pylori profile were normal or negative and rheumatoid factor was positive in one patient. All AAT-positive patients were women, but 26 of them had negative ASST. The correlation between ASST and AAT was not significant. CONCLUSION: Most patients were women UCE and only 4 had positive ASST, but this does not correlate with the presence of anti-thyroid antibodies. Most studies were normal, so we suggest not making unnecessary laboratory studies in this disease.


Antecedentes: la urticaria crónica espontánea es una enfermedad común en los adultos, sobre todo entre las mujeres; esta entidad con frecuencia está relacionada con padecimientos autoinmunitarios. Objetivo: evaluar, mediante estudios de laboratorio, si los pacientes con urticaria crónica espontánea tuvieron signos de autoinmunidad. Material y método: estudio transversal de 35 pacientes del área de Alergia e Inmunología del Hospital Juárez de México, diagnosticados con urticaria crónica espontánea. Se les realizó biometría hemática completa, anticuerpos antitiroideos (antiperoxidasa y tiroglobulina), anticuerpos antinucleares, factor reumatoide, anticoagulante lúpico, células LE, prueba cutánea de suero autólogo (Autologus Serum Skin Test, ASST), complemento (C3 y C4); como estudios adicionales se les realizó prueba de Helicobacter pylori, perfil tiroideo (T3,T4, TSH) y dímero D. Resultados: evaluamos 35 pacientes adultos, 27 eran mujeres. La prueba ASST fue positiva en cuatro pacientes, los anticuerpos antinucleares fueron negativos en todos los casos, pero los anticuerpos antitiroideos resultaron positivos en cuatro pacientes. Las células LE, anticoagulante lúpico, complemento, dímero D, perfil tiroideo y Helicobacter pylori fueron normales o negativos y el factor reumatoide fue positivo en un paciente. Todos los pacientes antitiroideos positivos eran mujeres y de ellas, 26 tuvieron ASST negativa. La correlación entre ASST y AAT no fue significativa. Conclusiones: en nuestro estudio, la mayoría de los pacientes con urticaria crónica espontánea eran mujeres y sólo cuatro tuvieron la prueba ASST positiva, pero esto no se correlaciona con existencia de anticuerpos antitiroideos. La mayor parte de los estudios realizados resultaron normales, por lo que sugerimos no hacer estudios de laboratorio innecesarios en esta afección.

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