Structural variants of Salmonella Typhimurium lipopolysaccharide induce less dimerization of TLR4/MD-2 and reduced pro-inflammatory cytokine production in human monocytes.

Autor: Aldapa-Vega G; Unidad de Investigación Médica en Inmunoquímica, Hospital de Especialidades, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Ciudad de México, Mexico; Programa de Posgrado en Inmunología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Ciudad de México, Mexico., Moreno-Eutimio MA; Unidad de Investigación de Inmunidad e Inflamación, División de Investigación, Hospital Juárez de México, Ciudad de México, Mexico., Berlanga-Taylor AJ; MRC-PHE Centre for Environment and Health, Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Medicine, Imperial College London, St Mary's Campus, Norfolk Place, London, UK., Jiménez-Uribe AP; Unidad de Investigación Médica en Inmunoquímica, Hospital de Especialidades, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Ciudad de México, Mexico., Nieto-Velazquez G; Unidad de Investigación de Inmunidad e Inflamación, División de Investigación, Hospital Juárez de México, Ciudad de México, Mexico., López-Ortega O; Departamento de Biomedicina Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Ciudad de México, Mexico., Mancilla-Herrera I; Departamento de Infectología e Inmunología, Instituto Nacional de Perinatología, Ciudad de México, Mexico., Cortés-Malagón EM; Unidad de Investigación en Genética y Cáncer, División de Investigación, Hospital Juárez de México, Ciudad de México, Mexico., Gunn JS; Department of Microbial Infection and Immunity, Infectious Diseases Institute, The Ohio State University, Columbus, OH, United States., Isibasi A; Unidad de Investigación Médica en Inmunoquímica, Hospital de Especialidades, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Ciudad de México, Mexico., Wong-Baeza I; Laboratorio de Inmunología Molecular II, Departamento de Inmunología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Ciudad de México, Mexico., López-Macías C; Unidad de Investigación Médica en Inmunoquímica, Hospital de Especialidades, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Ciudad de México, Mexico; Visiting Professor of Immunology. Nuffield Department of Medicine, University of Oxford. UK; Mexican Translational Immunology Research Group, FOCIS Centres of Excellence, Mexico. Electronic address: constantino@sminmunologia.mx., Pastelin-Palacios R; Facultad de Química, Universidad Nacional Autónoma de México, Ciudad de México, Mexico. Electronic address: rodolfop@unam.mx.
Jazyk: angličtina
Zdroj: Molecular immunology [Mol Immunol] 2019 Jul; Vol. 111, pp. 43-52. Date of Electronic Publication: 2019 Apr 06.
DOI: 10.1016/j.molimm.2019.03.003
Abstrakt: Salmonella enterica serovar Typhimurium (S. Typhimurium) changes the structure of its lipopolysaccharide (LPS) in response to the environment. The two main LPS variants found in S. Typhimurium correspond to LPS with a hepta-acylated lipid A (LPS 430) and LPS with modified phosphate groups on its lipid A (LPS 435). We have previously shown that these modified LPS have a lower capacity than wild type (WT) LPS to induce the production of pro-inflammatory cytokines in mice. Nevertheless, it is not know if LPS 430 and LPS 435 could also subvert the innate immune responses in human cells. In this study, we found that LPS 430 and LPS 435 were less efficient than WT LPS to induce the production of pro-inflammatory cytokines by human monocytes, in addition we found a decreased dimerization of the TLR4/MD-2 complex in response to LPS 430, suggesting that structurally modified LPS are sensed differently than WT LPS by this receptor; however, LPS 430 and 435 induced similar activation of the transcription factors NF-κB p65, IRF3, p38 and ERK1/2 than WT LPS. Microarray analysis of LPS 430- and LPS 435-activated monocytes revealed a gene transcription profile with differences only in the expression levels of microRNA genes compared to the profile induced by WT LPS, suggesting that the lipid A modifications present in LPS 430 and LPS 435 have a moderate effect on the activation of the human TLR4/MD-2 complex. Our results are relevant to understand LPS modulation of immune responses and this knowledge could be useful for the development of novel adjuvants and immunomodulators.
(Copyright © 2019 The Authors. Published by Elsevier Ltd.. All rights reserved.)
Databáze: MEDLINE