title: Helminth excreted/secreted antigens repress expression of LPS-induced Let-7i but not miR-146a and miR-155 in human dendritic cells.
abstract: MicroRNAs have emerged as key regulators of immune responses. They influence immune cells' function and probably the outcome of several infections. Currently, it is largely unknown if helminth parasites and their antigens modify host microRNAs expression. The aim of this study was to explore if excreted/secreted antigens of Taenia crassiceps regulate LPS-induced miRNAs expression in human dendritic cells. We found that these antigens repressed LPS-let-7i induction but not mir-146a or mir-155 and this correlates with a diminished inflammatory response. This let-7i downregulation in dendritic cells constitutes a novel feature of the modulatory activity that helminth-derived antigens exert on their host.
authors.affiliation: Biomedicine Unit, Facultad de Estudios Superiores Iztacala, UNAM, Avenida de los Barrios No. 1 Col. Los Reyes Iztacala, 54090 Tlalnepantla, MEX, Mexico.
authors.forename: Luis I
authors.initials: LI
authors.lastname: Terrazas
authors.forename: Fausto
authors.initials: F
authors.lastname: Sánchez-Muñoz
authors.forename: Magaly
authors.initials: M
authors.lastname: Pérez-Miranda
authors.forename: Ana M
authors.initials: AM
authors.lastname: Mejía-Domínguez
authors.forename: Yadira
authors.initials: Y
authors.lastname: Ledesma-Soto
authors.forename: Rafael
authors.initials: R
authors.lastname: Bojalil
authors.forename: Lorena
authors.initials: L
authors.lastname: Gómez-García
mesh_terms: D000818:Animals; D000947:Antigens, Helminth / Q000276:immunology*; D016207:Cytokines / Q000276:immunology; D003713:Dendritic Cells / Q000276:immunology / Q000378:metabolism*; D004443:Echinococcosis / Q000276:immunology*; D005786:Gene Expression Regulation; D020868:Gene Silencing; D006801:Humans; D008070:Lipopolysaccharides; D035683:MicroRNAs / Q000235:genetics / Q000378:metabolism*; D009000:Monocytes / Q000276:immunology; D013621:Taenia / Q000276:immunology*
chemical_list: D000947:Antigens, Helminth; D016207:Cytokines; D008070:Lipopolysaccharides; C542542:MIRN146 microRNA, human; C524942:MIRN155 microRNA, human; D035683:MicroRNAs; C487931:mirnlet7 microRNA, human