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de-Andrés-Del-Rosario A, Pestana-Eliche M, Marrero-Alemán G, Fagundo-González E, Ramírez-Conchas JM, Sánchez-Machín I. Localized Contact Urticaria by Egg in a Baby. Dermatitis 2024; 35:106-107. [PMID: 37040273 DOI: 10.1089/derm.2022.0066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
Affiliation(s)
| | - María Pestana-Eliche
- Department of Dermatology, Canarias University Hospital, La Laguna, Tenerife, Spain
| | - Gabriel Marrero-Alemán
- Department of Dermatology, Nuestra Señora de Candelaria University Hospital, S/C de Tenerife, Spain
| | - Eva Fagundo-González
- Department of Dermatology, Canarias University Hospital, La Laguna, Tenerife, Spain
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Wang X, Hu Y, Tan H, Dong X, Zhang S, Fu S, Gao J, Chen H, Liu G, Li X. Glutamine and lysine as common residues from epitopes on α-lactalbumin and β-lactoglobulin from cow milk identified by phage display technology. J Dairy Sci 2023; 106:7382-7395. [PMID: 37641259 DOI: 10.3168/jds.2022-23151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Accepted: 04/30/2023] [Indexed: 08/31/2023]
Abstract
Cow milk is an important source of food protein for children; however, it could lead to allergy, especially for infants. α-Lactalbumin (α-LA) and β-lactoglobulin (β-LG) from whey protein make up a relatively high proportion of milk proteins and have received widespread attention as major allergens in milk. However, few studies have identified the epitopes of both proteins simultaneously. In this study, ImmunoCAP and indirect ELISA were first used for detection of sIgE to screen sera from allergic patients with high binding capacity for α-LA and β-LG. Subsequently, the mimotopes was biopanned by phage display technology and bioinformatics and 17 mimic peptide sequences were obtained. Aligned with the sequences of α-LA or β-LG, we identified one linear epitope on α-LA at AA 11-26 and 5 linear epitopes on β-LG at AA 9-29, AA 45-57, AA 77-80, AA 98-101, and AA 121-135, respectively. Meanwhile, the 8 conformational epitopes and their distributions of α-LA and β-LG were located using the Pepitope Server. Finally, glutamine and lysine were determined as common AA residues for the conformational epitopes both on α-LA and β-LG. Moreover, we found the addition of mouse anti-human IgE during the biopanning process did not significantly affect the identification of the epitopes.
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Affiliation(s)
- Xinyu Wang
- State Key Laboratory of Food Science and Resources, Nanchang University, Nanchang 330047, China; School of Food Science and Technology, Nanchang University, Nanchang 330047, China
| | - Yongxin Hu
- State Key Laboratory of Food Science and Resources, Nanchang University, Nanchang 330047, China; School of Food Science and Technology, Nanchang University, Nanchang 330047, China
| | - Hongkai Tan
- State Key Laboratory of Food Science and Resources, Nanchang University, Nanchang 330047, China; School of Food Science and Technology, Nanchang University, Nanchang 330047, China
| | - Xiang Dong
- Department of Allergology, Zhongnan Hospital of Wuhan University, Wuhan 430071, China
| | - Shuchen Zhang
- Department of Allergy, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430014, China
| | - Siqi Fu
- State Key Laboratory of Food Science and Resources, Nanchang University, Nanchang 330047, China; School of Food Science and Technology, Nanchang University, Nanchang 330047, China
| | - Jinyan Gao
- State Key Laboratory of Food Science and Resources, Nanchang University, Nanchang 330047, China; School of Food Science and Technology, Nanchang University, Nanchang 330047, China; Jiangxi Province Key Laboratory of Food Allergy, Nanchang University, Nanchang, 330047, China
| | - Hongbing Chen
- State Key Laboratory of Food Science and Resources, Nanchang University, Nanchang 330047, China; Jiangxi Province Key Laboratory of Food Allergy, Nanchang University, Nanchang, 330047, China; Sino-German Joint Research Institute (Jiangxi-OAI), Nanchang University, Nanchang 330047, China
| | - Guanghui Liu
- Department of Allergology, Zhongnan Hospital of Wuhan University, Wuhan 430071, China.
| | - Xin Li
- State Key Laboratory of Food Science and Resources, Nanchang University, Nanchang 330047, China; School of Food Science and Technology, Nanchang University, Nanchang 330047, China; Jiangxi Province Key Laboratory of Food Allergy, Nanchang University, Nanchang, 330047, China.
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Sabit B, Ozdemir O, Kose E. Comparison of commercial allergen extract with various milk products of skin prick tests in diagnosing cow's milk protein allergy. Allergy Asthma Proc 2023; 44:193-199. [PMID: 37160745 DOI: 10.2500/aap.2023.44.230012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Introduction: In this study, we aimed to solve the incompatibilities between the skin prick test (SPT) result and the clinical picture encountered among patients. Thus, we used various milk products (raw, ultrahigh temperature [UHT], and pasteurized cow's milk) with commercial milk allergen extract in patients we think may have cow's milk protein allergy (CMPA) and made a comparison among the milk types. Methods: This study was conducted retrospectively between February 1, 2019, to June 1, 2019, at a pediatric allergy polyclinic of the university training/research hospital. A pair of 79 individuals, as control and patient groups, ages between 1 month and 21 years who were presented with a suspicion of CMPA and defined with SPT and/or allergen-specific immunoglobulin E (IgE) levels were included in the study. Allergen-specific IgE tests (specific IgE cow's milk, β-lactoglobulin, α-lactalbumin, casein) were evaluated. SPT was performed with fresh/raw, UHT, and pasteurized (daily) cow's milk besides the standard used commercial extract. Results: In the group included in the study and defined as IgE-mediated CMPA, 52.9% of the 79 patients were boys (n = 46), 47.1% were girls (n = 33), and the median age was 6 months (5.0-8.0 months). In the group of specific IgE cow's milk reaction that was sought, frequency and wheal (induration) size of SPT reaction to fresh/raw milk was also found to be statistically significant between positive- and negative-reaction groups, not detected against other milk products. The area under the curve for the diagnostic value of fresh milk was 93.1%. For the cutoff value of 2.50 mm, 88.1% sensitivity and 90.8% specificity were determined. In the group of specific IgE β-lactoglobulin reaction searched, there was a statistically significant difference in the frequency of SPT positivity and wheal size against UHT, fresh, and daily/pasteurized milk between positive and negative reaction groups. When the correlations of the mean induration axis in the tests were examined, it was found that, among raw milk, daily milk, cow's milk allergen extract, and UHT milk, a strong positive correlation was also statistically significant. Conclusion: The positivity that could not be detected with SPT when using allergen extract in a patient with positive specific IgE cow's milk result in the clinic can be detected with SPT made with fresh (raw) milk, which can be an alternative. In addition, specific IgE β-lactoglobulin seems to be the most compatible with the SPT wheal size (induration) of other milk types rather than extract. Comparative studies of SPT allergen extracts and various milk types used in the diagnosis of CMPA are very scarce in the literature, and more studies are needed on this subject.
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Affiliation(s)
- Berat Sabit
- From the Department of Pediatrics, Research and Training Hospital of Sakarya University Medical Faculty, Sakarya University Medical Faculty, Sakarya, Turkey
| | - Oner Ozdemir
- Division of Allergy and Immunology, Department of Pediatrics, Research and Training Hospital of Sakarya University, Sakarya University Medical Faculty, Sakarya, Turkey, and
| | - Elif Kose
- Department of Public Health, Sakarya University Medical Faculty, Sakarya, Türkiye
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