Antigenic Determinant of Helicobacter pylori FlaA for Developing Serological Diagnostic Methods in Children

Author:

Park Hyun-EuiORCID,Park Seorin,Nizamutdinov Damir,Seo Ji-Hyeun,Park Ji-ShookORCID,Jun Jin-Su,Shin Jeong-Ih,Boonyanugomol Wongwarut,Park Jin-Sik,Shin Min-KyoungORCID,Baik Seung-Chul,Youn Hee-Shang,Cho Myung-Je,Kang Hyung-Lyun,Lee Woo-KonORCID,Jung MyunghwanORCID

Abstract

The early diagnosis of Helicobacter pylori infection is important for gastric cancer prevention and treatment. Although endoscopic biopsy is widely used for H. pylori diagnosis, an accurate biopsy cannot be performed until a lesion becomes clear, especially in pediatric patients. Therefore, it is necessary to develop convenient and accurate methods for early diagnosis. FlaA, an essential factor for H. pylori survival, shows high antigenicity and can be used as a diagnostic marker. We attempted to identify effective antigens containing epitopes of high diagnostic value in FlaA. Full-sized FlaA was divided into several fragments and cloned, and its antigenicity was investigated using Western blotting. The FlaA fragment of 1345–1395 bp had strong immunogenicity. ELISA was performed with serum samples from children by using the 1345–1395 bp recombinant antigen fragment. IgG reactivity showed 90.0% sensitivity and 90.5% specificity, and IgM reactivity showed 100% sensitivity and specificity. The FlaA fragment of 1345–1395 bp discovered in the present study has antigenicity and is of high value as a candidate antigen for serological diagnosis. The FlaA 1345–1395 bp epitope can be used as a diagnostic marker for H. pylori infection, thereby controlling various gastric diseases such as gastric cancer and peptic ulcers caused by H. pylori.

Funder

National Research Foundation of Korea

Institute of Health Science, Gyeongsang National University

Publisher

MDPI AG

Subject

Infectious Diseases,Microbiology (medical),General Immunology and Microbiology,Molecular Biology,Immunology and Allergy

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