Artículo de revista
Glucocorticoids impair phagocytosis and inflammatory response against crohn's disease-associated adherent-invasive escherichia coli
Fecha
2018Registro en:
Frontiers in Immunology May 2018 Volume 9 Article 1026
10.3389/fimmu.2018.01026
Autor
Olivares Morales, Mauricio
Fuente, Marjorie de la
Dubois Camacho, Karen
Palominos Parada, Daniela Paz
Díaz Jiménez, David
Torres Riquelme, Alejandro
Xu, Xiaojiang
Chamorro Veloso, Nayaret
Naves, Rodrigo
González Burgos, María Julieta
Quera Pino, Rodrigo
Figueroa, Carolina
Cidlowski, John Anthony
Vidal, Roberto
Hermoso Ramello, Marcela
Institución
Resumen
Crohn's disease (CD) is a chronic inflammatory bowel disorder characterized by deregulated inflammation triggered by environmental factors Notably, adherent-invasive Escherichia coli (AIEC), a bacterium with the ability to survive within macrophages is believed to be one of such factors Glucocorticoids are the first line treatment for CD and to date, it is unknown how they affect bactericidal and inflammatory properties of macrophages against AIEC The aim of this study was to evaluate the impact of glucocorticoid treatment on AIEC infected macrophages First, THP-1 cell-derived macrophages were infected with a CD2-a AIEC strain, in the presence or absence of the glucocorticoid dexamethasone (Dex) and mRNA microarray analysis was performed Differentially expressed mRNAs were confirmed by TaqMan-qPCR. In addition, an amikacin protection assay was used to evaluate the phagocytic and bactericidal activity of Dex-treated macrophages infected with E. coli strains (CD2-a, HM605, NRG857c, and HB101). Finally, cytokine secretion and the inflammatory phenotype of macrophages were evaluated by ELISA and flow cytometry, respectively The microarray analysis showed that CD2-a, Dex, and CD2-a + Dex-treated macrophages have differential inflammatory gene profiles Also, canonical pathway analysis revealed decreased phagocytosis signaling by Dex and anti inflammatory polarization on CD2-a + Dex macrophages. Moreover, amikacin protection assay showed reduced phagocytosis upon Dex treatment and TaqMan-qPCR confirmed Dex inhibition of three phagocytosis-associated genes All bacteria strains induced TNF-alpha, IL-6, IL-23, CD40, and CD80, which was inhibited by Dex Thus, our data demonstrate that glucocorticoids impair phagocytosis and induce anti-inflammatory polarization after AIEC infection, possibly contributing to the survival of AIEC in infected CD patients.