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B) IgE-inmunodetección de extractos de harina de trigo sarraceno. 1: trigo sarraceno (condiciones no reductoras)<span class="elsevierStyleHsp" style=""></span>+<span class="elsevierStyleHsp" style=""></span>control negativo. 2: trigo sarraceno (condiciones no reductoras)<span class="elsevierStyleHsp" style=""></span>+<span class="elsevierStyleHsp" style=""></span>suero paciente. 3: trigo sarraceno (condiciones reductoras)<span class="elsevierStyleHsp" style=""></span>+<span class="elsevierStyleHsp" style=""></span>control negativo. Trigo sarraceno (condiciones reductoras)<span class="elsevierStyleHsp" style=""></span>+<span class="elsevierStyleHsp" style=""></span>suero paciente. En el lado izquierdo, se indica la posición de los marcadores de peso molecular (10, 15, 20, 25, 37, 50, 75, 100,150, 250 kDa).</p>" ] ] ] "autores" => array:1 [ 0 => array:2 [ "autoresLista" => "Silvia Pascual Erquicia, Marta Bernaola Abraira, Sandra Dorado Arenas, Isabel Urrutia Landa, Itziar Arrizubieta Basterrechea, Olaia Bronte Moreno, Ane Uranga Echeverría, Txomin Zabala Hernández, Amaia Artaraz Ereño, Lucía Jimeno Nogales" "autores" => array:10 [ 0 => array:2 [ "nombre" => "Silvia" "apellidos" => "Pascual Erquicia" ] 1 => array:2 [ "nombre" => "Marta" "apellidos" => "Bernaola Abraira" ] 2 => array:2 [ "nombre" => "Sandra" "apellidos" => "Dorado Arenas" ] 3 => array:2 [ "nombre" => "Isabel" "apellidos" => "Urrutia Landa" ] 4 => array:2 [ "nombre" => "Itziar" "apellidos" => "Arrizubieta Basterrechea" ] 5 => array:2 [ "nombre" => "Olaia" "apellidos" => "Bronte Moreno" ] 6 => array:2 [ "nombre" => "Ane" "apellidos" => "Uranga Echeverría" ] 7 => array:2 [ "nombre" => "Txomin" "apellidos" => "Zabala Hernández" ] 8 => array:2 [ "nombre" => "Amaia" "apellidos" => "Artaraz Ereño" ] 9 => array:2 [ "nombre" => "Lucía" "apellidos" => "Jimeno Nogales" ] ] ] ] ] "idiomaDefecto" => "es" "Traduccion" => array:1 [ "en" => array:9 [ "pii" => "S1579212920301099" "doi" => "10.1016/j.arbr.2020.02.004" "estado" => "S300" "subdocumento" => "" "abierto" => array:3 [ "ES" => false "ES2" => false "LATM" => false ] "gratuito" => false "lecturas" => array:1 [ "total" => 0 ] "idiomaDefecto" => "en" "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/S1579212920301099?idApp=UINPBA00003Z" ] ] "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/S0300289620300594?idApp=UINPBA00003Z" "url" => "/03002896/0000005600000007/v2_202007230732/S0300289620300594/v2_202007230732/es/main.assets" ] ] "itemSiguiente" => array:19 [ "pii" => "S1579212920301336" "issn" => "15792129" "doi" => "10.1016/j.arbr.2020.02.006" "estado" => "S300" "fechaPublicacion" => "2020-07-01" "aid" => "2425" "copyright" => "SEPAR" "documento" => "simple-article" "crossmark" => 1 "subdocumento" => "crp" "cita" => "Arch Bronconeumol. 2020;56:468-9" "abierto" => array:3 [ "ES" => false "ES2" => false "LATM" => false ] "gratuito" => false "lecturas" => array:1 [ "total" => 0 ] "en" => array:11 [ "idiomaDefecto" => true "cabecera" => "<span class="elsevierStyleTextfn">Scientific Letter</span>" "titulo" => "Pulmonary Manifestation of a Primarily Mucocutaneous Hereditary Disease" "tienePdf" => "en" "tieneTextoCompleto" => "en" "paginas" => array:1 [ 0 => array:2 [ "paginaInicial" => "468" "paginaFinal" => "469" ] ] "titulosAlternativos" => array:1 [ "es" => array:1 [ "titulo" => "Manifestación pulmonar de una enfermedad hereditaria de expresión fundamentalmente mucocutánea" ] ] "contieneTextoCompleto" => array:1 [ "en" => true ] "contienePdf" => array:1 [ "en" => true ] "resumenGrafico" => array:2 [ "original" => 0 "multimedia" => array:7 [ "identificador" => "fig0005" "etiqueta" => "Fig. 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 869 "Ancho" => 1750 "Tamanyo" => 240546 ] ] "descripcion" => array:1 [ "en" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">(A) Mucocutaneous manifestations: nail dystrophy, reticular pigmentation, and oral leukoplakia. 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"Jimeno Nogales" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">c</span>" "identificador" => "aff0015" ] ] ] ] "afiliaciones" => array:3 [ 0 => array:3 [ "entidad" => "Servicio de Neumología, Hospital Universitario Galdakao, Vizcaya, Spain" "etiqueta" => "a" "identificador" => "aff0005" ] 1 => array:3 [ "entidad" => "Servicio de Alergología, Hospital Universitario La Princesa, Madrid, Spain" "etiqueta" => "b" "identificador" => "aff0010" ] 2 => array:3 [ "entidad" => "Departamento de I + D ALK, Madrid, Spain" "etiqueta" => "c" "identificador" => "aff0015" ] ] "correspondencia" => array:1 [ 0 => array:3 [ "identificador" => "cor0005" "etiqueta" => "⁎" "correspondencia" => "Corresponding author." ] ] ] ] "titulosAlternativos" => array:1 [ "es" => array:1 [ "titulo" => "Rinoconjuntivitis y asma ocupacional por alergia a harina de trigo sarraceno" ] ] "resumenGrafico" => array:2 [ "original" => 0 "multimedia" => array:7 [ "identificador" => "fig0005" "etiqueta" => "Fig. 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 1076 "Ancho" => 2083 "Tamanyo" => 178382 ] ] "descripcion" => array:1 [ "en" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">(A) Prick-to-prick with buckwheat flour. (B) IgE-immunodetection of buckwheat flour extracts. 1: buckwheat (non-reducing conditions)<span class="elsevierStyleHsp" style=""></span>+<span class="elsevierStyleHsp" style=""></span>negative control. 2: buckwheat (non-reducing conditions)<span class="elsevierStyleHsp" style=""></span>+<span class="elsevierStyleHsp" style=""></span>patient serum. 3: buckwheat (reducing conditions)<span class="elsevierStyleHsp" style=""></span>+<span class="elsevierStyleHsp" style=""></span>negative control. Buckwheat (non-reducing conditions)<span class="elsevierStyleHsp" style=""></span>+<span class="elsevierStyleHsp" style=""></span>patient. On the left, position of the molecular weight markers (10, 15, 20, 25, 37, 50, 75, 100, 150, 250<span class="elsevierStyleHsp" style=""></span>kDa).</p>" ] ] ] "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">Buckwheat or saracen (<span class="elsevierStyleItalic">Fagopyrum esculentum)</span> is a herbaceous plant of the <span class="elsevierStyleItalic">Polygonaceae</span> family, native to Central Asia. It has a high nutritional value, with a higher protein and fatty acid content than cereals.<a class="elsevierStyleCrossRefs" href="#bib0080"><span class="elsevierStyleSup">1,2</span></a> Cases of IgE-mediated buckwheat allergy have been reported, caused by both inhalation of flour and ingestion. It presents with rhinoconjunctival, bronchial, gastrointestinal, and cutaneous symptoms, and even anaphylaxis.<a class="elsevierStyleCrossRefs" href="#bib0090"><span class="elsevierStyleSup">3–5</span></a> We report a case of rhinoconjunctivitis and occupational asthma due to buckwheat flour allergy in a baker.</p><p id="par0010" class="elsevierStylePara elsevierViewall">Our patient was a 45-year-old man with a history of allergic rhinitis due to dust mite sensitization who had been a baker for 26 years. He consulted due to an 8-month history of episodes of cough, dyspnea, sneezing, watery rhinorrhea, nasal congestion, and ocular pruritus, occurring exclusively in the workplace on the days that his colleague was kneading dough with buckwheat flour. His symptoms remitted at home.</p><p id="par0015" class="elsevierStylePara elsevierViewall">On physical examination, the patient had bilateral nasal obstruction and was in good general condition, afebrile and eupneic, with normal cardiopulmonary auscultation. The allergy work-up began with skin tests (prick test) with battery of airborne allergens and foods (commercial extracts) including wheat flour, barley, rye, oats, maize, rice, gliadin, nuts, milk, egg and lipid-carrying proteins. Results were positive for dust mites and 5% P/V buckwheat flour extract (9<span class="elsevierStyleHsp" style=""></span>mm×7<span class="elsevierStyleHsp" style=""></span>mm). In addition, prick-to-prick tests were performed with an extract of buckwheat prepared by us from flour provided by the patient, which gave a positive result (18<span class="elsevierStyleHsp" style=""></span>mm×11<span class="elsevierStyleHsp" style=""></span>mm) (<a class="elsevierStyleCrossRef" href="#fig0005">Fig. 1</a>). The study was then extended by determining IgE using the ImmunoCAP method™ (purified extract) with the following results: total IgE 187<span class="elsevierStyleHsp" style=""></span>KU/l, specific IgE for buckwheat 15.4<span class="elsevierStyleHsp" style=""></span>KU/l, wheat and rye <0.1<span class="elsevierStyleHsp" style=""></span>KU/l, <span class="elsevierStyleItalic">Dermatophagoides pteronyssinus</span> 10.1<span class="elsevierStyleHsp" style=""></span>KU/l, and <span class="elsevierStyleItalic">Lepidoglyphus destructor</span> 1.98<span class="elsevierStyleHsp" style=""></span>KU/l.</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0020" class="elsevierStylePara elsevierViewall">Chest X-ray showed no pathological changes. Spirometry was normal: forced vital capacity (FVC) 6060<span class="elsevierStyleHsp" style=""></span>ml (115%), forced expiratory volume in 1<span class="elsevierStyleHsp" style=""></span>s (FEV<span class="elsevierStyleInf">1</span>) 4820<span class="elsevierStyleHsp" style=""></span>ml (113.5%), FEV1/FVC (80.63%), with a negative bronchodilator test, and FeNO of 115 parts per billion. The nonspecific bronchial challenge test with methacholine performed while the patient was still working was positive (0.022<span class="elsevierStyleHsp" style=""></span>mg).</p><p id="par0025" class="elsevierStylePara elsevierViewall">In view of the findings described, we decided to perform a specific bronchial challenge test (SBCT) while he was on sick leave. Initially there was no variability after exposure to placebo. Four minutes after the first exposure to the allergen in the cabin using a mixture of lactose and buckwheat flour, acquired externally, at low concentration, using the method described by Pepys, the patient presented severe bronchospasm with a 35% fall in FEV<span class="elsevierStyleInf">1</span> from baseline.</p><p id="par0030" class="elsevierStylePara elsevierViewall">Finally, in order to identify the specific proteins of the buckwheat that induced IgE antibody synthesis in this patient, immunoblotting was performed, using the same extract made from the flour provided by the patient. Several IgE binding bands against different extract proteins were detected in reducing and non-reducing conditions (from <9 to 75<span class="elsevierStyleHsp" style=""></span>kDa) (<a class="elsevierStyleCrossRef" href="#fig0005">Fig. 1</a>).</p><p id="par0035" class="elsevierStylePara elsevierViewall">Although we could not rule out the presence of mites in the extract used for skin tests, immunoblotting and SBCT, the determination of specific IgE by ImmunoCAP™ confirmed sensitization to buckwheat flour.</p><p id="par0040" class="elsevierStylePara elsevierViewall">The patient was diagnosed with IgE-mediated occupational rhinoconjunctivitis and asthma due to buckwheat flour allergy. He was advised to avoid exposure to this flour and to start treatment with long-acting bronchodilators and inhaled corticosteroids to avoid progression and chronification of symptoms.</p><p id="par0045" class="elsevierStylePara elsevierViewall">Buckwheat, despite its name, has no taxonomic relationship with wheat. Due to its high nutritional value, and the absence of gluten, this flour is ideal for the preparation of celiac products, and its use as an ingredient of foods considered “ecological” is currently increasing.</p><p id="par0050" class="elsevierStylePara elsevierViewall">Several cases of hypersensitivity reactions to buckwheat have been described, mainly in Japan where, due to high local consumption, it causes up to 3% of cases of anaphylaxis in this population.<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">4</span></a></p><p id="par0055" class="elsevierStylePara elsevierViewall">The prevalence of respiratory symptoms in an occupational setting among bakers is high: 5%–10% for asthma and 15%–20% for rhinitis.<a class="elsevierStyleCrossRefs" href="#bib0105"><span class="elsevierStyleSup">6,7</span></a> Sensitization is 4.2% per person per year in exposures of less than 4 years<a class="elsevierStyleCrossRef" href="#bib0115"><span class="elsevierStyleSup">8</span></a> (1.0% in longer exposures),<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">9</span></a> and this rate increases at higher doses of allergen, especially in atopic patients.<a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">6</span></a> In bakers, the causative allergens are mostly high molecular weight flour proteins, but other agents present at all stages, from cereal production to bread making (pesticides, contaminants such as mites, fungi, enzymes, etc.), must be taken into account. Buckwheat is a pseudocereal that contains several high molecular weight proteins and, like other allergenic sources, requires a period of exposure to induce sensitization that produces an IgE-mediated hypersensitivity reaction.</p><p id="par0060" class="elsevierStylePara elsevierViewall">Diagnosis requires demonstrating sensitization by skin and/or immunological tests and relating exposure to symptoms. SBCT is the gold standard for diagnosing occupational asthma, as it is the only test that establishes an etiological diagnosis through controlled exposure to increasing doses of the suspected agent while monitoring FEV<span class="elsevierStyleInf">1</span>.</p><p id="par0065" class="elsevierStylePara elsevierViewall">The most effective preventive method is to control the level of allergenic exposure in order to reduce the number of sensitized workers. Reducing exposure and using protection may reduce symptoms, but the only measure that improves lung function is to avoid exposure.<a class="elsevierStyleCrossRefs" href="#bib0125"><span class="elsevierStyleSup">10,11</span></a></p><p id="par0070" class="elsevierStylePara elsevierViewall">The importance of this case lies in the scarce availability of literature on occupational asthma due to buckwheat sensitization.<a class="elsevierStyleCrossRefs" href="#bib0135"><span class="elsevierStyleSup">12–15</span></a> According to hospital records, it can induce serious reactions, although these are rare.<a class="elsevierStyleCrossRefs" href="#bib0090"><span class="elsevierStyleSup">3–5</span></a> The absence of studies and underdiagnosis due to lack of suspicion make it difficult to estimate the prevalence of this allergy.</p><p id="par0075" class="elsevierStylePara elsevierViewall">Buckwheat is also becoming more prominent in the food sector in Europe because of increased consumption of gluten-free foods. The need for it to be declared as a food allergen should be considered to avoid accidental exposures with significant risks.</p></span>" "pdfFichero" => "main.pdf" "tienePdf" => true "NotaPie" => array:1 [ 0 => array:2 [ "etiqueta" => "☆" "nota" => "<p class="elsevierStyleNotepara" id="npar0005">Please cite this article as: Pascual Erquicia S, Bernaola Abraira M, Dorado Arenas S, Urrutia Landa I, Arrizubieta Basterrechea I, Bronte Moreno O, et al. Rinoconjuntivitis y asma ocupacional por alergia a harina de trigo sarraceno. Arch Bronconeumol. 2020;56:466–468.</p>" ] ] "multimedia" => array:1 [ 0 => array:7 [ "identificador" => "fig0005" "etiqueta" => "Fig. 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 1076 "Ancho" => 2083 "Tamanyo" => 178382 ] ] "descripcion" => array:1 [ "en" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">(A) Prick-to-prick with buckwheat flour. (B) IgE-immunodetection of buckwheat flour extracts. 1: buckwheat (non-reducing conditions)<span class="elsevierStyleHsp" style=""></span>+<span class="elsevierStyleHsp" style=""></span>negative control. 2: buckwheat (non-reducing conditions)<span class="elsevierStyleHsp" style=""></span>+<span class="elsevierStyleHsp" style=""></span>patient serum. 3: buckwheat (reducing conditions)<span class="elsevierStyleHsp" style=""></span>+<span class="elsevierStyleHsp" style=""></span>negative control. Buckwheat (non-reducing conditions)<span class="elsevierStyleHsp" style=""></span>+<span class="elsevierStyleHsp" style=""></span>patient. On the left, position of the molecular weight markers (10, 15, 20, 25, 37, 50, 75, 100, 150, 250<span class="elsevierStyleHsp" style=""></span>kDa).</p>" ] ] ] "bibliografia" => array:2 [ "titulo" => "References" "seccion" => array:1 [ 0 => array:2 [ "identificador" => "bibs0015" "bibliografiaReferencia" => array:15 [ 0 => array:3 [ "identificador" => "bib0080" "etiqueta" => "1" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Morphology of nectaries and biology of nectar production in the distylous species <span class="elsevierStyleItalic">Fagopyrum esculentum</span>" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:3 [ 0 => "V. Cawoy" 1 => "J.M. Kinet" 2 => "A.L. 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