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TNFR1 Signaling Contributes to T Cell Anergy During Sepsis. | LitMetric

TNFR1 Signaling Contributes to T Cell Anergy During Sepsis.

Front Cell Infect Microbiol

Instituto de Investigaciones en Microbiología y Parasitología Médica, Consejo Nacional de Investigaciones Científicas y Tecnológicas, Universidad de Buenos Aires, Buenos Aires, Argentina.

Published: August 2019

AI Article Synopsis

Article Abstract

Early research on sepsis has focused on the initial hyper-inflammatory, cytokine mediated phase of the disorder whereas the events that govern the concomitant and subsequent anti-inflammatory compensatory response are not completely understood. In this context, the putative participation of TNFR1-mediated signaling in the immunosuppressive phase of sepsis has not been elucidated. The aim of this study was to determine the role of TNFR1 in directing the immune dysfunction during sepsis and the potential contribution of MDSC to this process. Using a model of sepsis of peritoneal origin and 1 mice, we demonstrated that during staphylococcal sepsis CD4 T cell anergy is significantly dependent on TNFR1 expression and that signaling through this receptor has an impact on bacterial clearance in the spleen. MDSC played a major role in the generation of anergic CD4 T cells and their accumulation in the spleen during sepsis correlated with IL-6 induction. Although TNFR1 signaling was not required for MDSC accumulation and expansion in the spleen, it determined the expression of Arginase 1 and iNOS, enzymes known to participate in the suppressive function of this population. Moreover, our data indicate that TNFR1-mediated IL-10 production may modulate MDSC function during staphylococcal sepsis. Taken together these results indicate that TNFR1 plays a critical role on T cell dysfunction during sepsis by regulating immunomodulatory mediators in MDSC. The role of TNFR1-mediated signaling during the immunosuppressive phase of staphylococcal sepsis should be considered when designing novel alternative therapeutic approaches.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6085448PMC
http://dx.doi.org/10.3389/fcimb.2018.00259DOI Listing

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