Potential contribution of Helicobacter pylori proteins in the pathogenesis of type 1 gastric neuroendocrine tumor and urticaria. In silico approach

ABSTRACT: Background: Helicobacter pylori has been linked to several diseases such as chronic urticaria, gastritis, and type 1 gastric neuroendocrine tumors (type 1 gNET). Although these diseases seem to have different mechanisms, their relationship with H. pylori suggests a common inflammatory pathway. Objective: To identify potential cross-reactive antigens between H. pylori and humans involved in chronic urticaria and type 1 gNET. Methods: Alignment was carried out among human proteins associated with urticaria (9 proteins), type 1 gNET (32 proteins), and H. pylori proteome. We performed pairwise alignment among the human and H. pylori antigens with PSI-BLAST. Modeling based on homology was done with the Swiss model server and epitope prediction with the Ellipro server. Epitopes were located on a 3D model using PYMOL software. Results: The highest conserved sequence was found between the human HSP 60 antigen and the H. pylori chaperonin GroEL with an identity of 54% and a cover of 92%, followed by the alpha and gamma enolases and two H. pylori phosphopyruvate hydratase, both with an identity and cover of 48% and 96%, respectively. The H/K ATPase (Chain A) showed high identity with two H. pylori proteins (35.21% with both P-type ATPase), but with low cover (only 6%). We observed eight linear and three discontinuous epitopes for human HSP 60 and three lineal and one discontinuous epitope for both alpha-enolase and gamma enolase, high conserved with H. pylori sequences. Conclusion: Some type 1 gNET antigens shared potential cross-reactive epitopes with H. pylori proteins, suggesting that molecular mimicry could be a mechanism that explains the relationship between the infection and this disease. Studies evaluating the functional impact of this relationship are needed.

• Autores: Sánchez Caraballo, Jorge Mario; Sánchez Caraballo, Andrés; García Gómez, Elizabeth; Munera Gómez, Marlon Gustavo; González Devia, Deyanira; Guzmán Ruiz, Yenny
• Tipo de recurso: Article of investigation
• Fecha de publicación: 2023
• Institución: Universidad de Antioquia
• Repositorio: Repositorio UdeA
• Idioma: eng
• OAI Identifier: oai:bibliotecadigital.udea.edu.co:10495/44793
• Acceso en línea: https://hdl.handle.net/10495/44793
• Palabra clave: Urticaria Crónica; Chronic Urticaria; Epítopos; Epitopes; Infecciones por Helicobacter; Helicobacter Infections; Tumores Neuroendocrinos; Neuroendocrine Tumors; https://id.nlm.nih.gov/mesh/D000080223; https://id.nlm.nih.gov/mesh/D000939; https://id.nlm.nih.gov/mesh/D016481; https://id.nlm.nih.gov/mesh/D018358
• Rights: openAccess
• License: http://creativecommons.org/licenses/by/2.5/co/