1. Recombinant vs native Anisakis haemoglobin (Ani s 13): Its appraisal as a new gold standard for the diagnosis of allergy
- Author
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Carmen Cuéllar, Teresa Gárate, Luis Rivas, Rafael Núñez-Ramírez, Juan González-Fernández, Juan Román Luque-Ortega, M.J. Perteguer, Pamela Campioli, Alvaro Daschner, Instituto de Salud Carlos III, European Commission, González-Fernández, Juan, Rivas, Luis, Núñez-Ramírez, Rafael, Gárate, Teresa, Perteguer, M. J., Daschner, Alvaro, González-Fernández, Juan [0000-0002-0306-8399], Rivas, Luis [0000-0002-2958-3233], Núñez-Ramírez, Rafael [0000-0002-2949-8709], Gárate, Teresa [0000-0002-1504-2209], Perteguer, M. J. [0000-0002-7533-5134], and Daschner, Alvaro [0000-0001-7725-981X]
- Subjects
0301 basic medicine ,Allergy ,medicine.disease_cause ,Immunoglobulin E ,Anisakis ,law.invention ,Hemoglobins ,Mice ,0302 clinical medicine ,Allergen ,law ,Purification ,Fish parasites ,Mice, Inbred BALB C ,Recombinant ,biology ,Ascaris ,General Medicine ,Negative stain ,Recombinant Proteins ,Infectious Diseases ,Ani s 13 ,Recombinant DNA ,Female ,IgE ,Haemoglobin ,Glycan ,DNA, Complementary ,Immunoblotting ,Immunology ,Cross Reactions ,03 medical and health sciences ,Antigen ,Hypersensitivity ,medicine ,Animals ,Humans ,Base Sequence ,Allergens ,biology.organism_classification ,medicine.disease ,Molecular biology ,030104 developmental biology ,030228 respiratory system ,Immunoglobulin G ,biology.protein ,Parasitology ,Sequence Alignment ,Ultracentrifugation - Abstract
11 p.-8 fig.-1 graph. abst., Recombinant allergens are currently the best option for serodiagnosis of human anisakiasis in terms of sensitivity and specificity. However, previous reports showed high rates of anisakiasis patients who were negative to Ani s 7 and especially to Ani s 1. Recently, Anisakis haemoglobin was described as a major allergen (Ani s 13). Although Ani s 13 belongs to a conserved protein family, it seems not to be a cross reacting antigen because of the absence of IgE recognition against Ascaris haemoglobin in Anisakis patients. The aim of this study is to develop a more sensitive and specific diagnosis tool for Anisakis based on the recently discovered allergen Ani s 13. We obtained and purified recombinant Anisakis haemoglobin (rAni s 13) and the native form (nAni s 13). The recognition of both recombinant and native haemoglobins by anti-haemoglobin IgE from patients' sera was assessed by indirect ELISA and immunoblotting using 43 Anisakis sensitised patients and 44 non-Anisakis sensitised patients. Native Ani s 13 was also treated with periodate to study if oxidation of glycans destroys antibody binding. Furthermore, it was structurally characterised by negative staining electron microscopy and analytical ultracentrifugation. Recombinant Ani s 13 was only recognised by four patients with gastro-allergic anisakiasis (GAA) and immunoblotting analyses showed no bands. However, nAni s 13 was detected by 72.1% of Anisakis sensitised patients measured by indirect ELISA. Particularly, 18 (90%) out of 20 GAA patients were positive. Tetramers and octamers were the most abundant homomers of nAni s 13 but octamers had higher content of bound heme. None of the non-Anisakis sensitised patients were positive. Combined use of purified native form of Ani s 13 with current gold standards would improve the sensitivity and specificity for diagnosing anisakiasis., This work was supported by ISCIII: RETICS FEDER RICET [RD12/0018/0007 to LR] and [RD12/0018/0011 and PI14CIII/00076 to TG and MJP]. .
- Published
- 2017