Canis familiaris allergen Can f 7: Expression, purification and analysis of B cell epitopes in Chinese children with dog allergies

Wang,Rui‑Qi; Wang,Yu‑Jie; Xu,Zhi‑Qiang; Zhou,Yan‑Jun; Cao,Meng‑Da; Zhu,Wei; Sun,Jin‑Lyu; Wei,Ji‑Fu

doi:10.3892/ijmm.2019.4065

Canis familiaris allergen Can f 7: Expression, purification and analysis of B cell epitopes in Chinese children with dog allergies

Authors:
- Rui‑Qi Wang
- Yu‑Jie Wang
- Zhi‑Qiang Xu
- Yan‑Jun Zhou
- Meng‑Da Cao
- Wei Zhu
- Jin‑Lyu Sun
- Ji‑Fu Wei
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Affiliations: Department of Allergy, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing Key Laboratory of Precision Medicine for Diagnosis and Treatment on Allergic Diseases, Beijing 100730, P.R. China, Research Division of Clinical Pharmacology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China
Published online on: January 15, 2019 https://doi.org/10.3892/ijmm.2019.4065
Pages: 1531-1541

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Abstract

Dogs are a major source of indoor allergens. However, the prevalence of dog allergies in China remains unclear, especially in children. In the present study, Can f 7, a canine allergen belonging to the Niemann pick type C2 protein family, was selected to study its sensitization rate in Chinese children with dog allergies. The Can f 7 gene was subcloned into a pET‑28a vector and expressed in Escherichia coli BL21 (DE3) cells. Recombinant Can f 7 was purified by nickel affinity chromatography, identified by SDS‑PAGE electrophoresis, and had its allergenicity assessed by western blot, ELISA and basophil activation tests. Through a series of bioinformatical approaches, B‑cell epitopes, secondary structures, and 3 dimensional (3D) homology modeling of Can f 7 were predicted. The activity of the B cell epitopes was verified by ELISA. The recombinant Can f 7 showed a distinct band with a molecular weight of 14 kDa. Six of 20 sera from dog‑allergic children reacted positively to the Can f 7. Can f 7 induced an ~4.0‑fold increase in cluster of differentiation 63 and C‑C motif chemokine receptor R3 expression in basophils sensitized with the serum of dog‑allergic children compared with those of non‑allergic controls. The secondary structure analysis showed that Can f 7 contains 6 β‑sheets. Five B cell epitopes of Can f 7 were predicted, and two of these were confirmed by ELISA. These results indicate that Can f 7 is an important canine allergen in Chinese children and provide novel data for further research concerning the use of Can f 7 in the diagnosis and treatment of Chinese children with canine allergy symptoms.

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