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IL-1β Induces SOCS2 Expression in Human Dendritic Cells

Authors
  • Sarajlic, Muamera1
  • Neuper, Theresa1
  • Föhrenbach Quiroz, Kim Tamara1
  • Michelini, Sara1
  • Vetter, Julia2
  • Schaller, Susanne2
  • Horejs-Hoeck, Jutta1, 3
  • 1 (S.M.)
  • 2 (S.S.)
  • 3 Cancer Cluster Salzburg (CCS), 5020 Salzburg, Austria
Type
Published Article
Journal
International Journal of Molecular Sciences
Publisher
MDPI AG
Publication Date
Nov 25, 2019
Volume
20
Issue
23
Identifiers
DOI: 10.3390/ijms20235931
PMID: 31775389
PMCID: PMC6928683
Source
PubMed Central
Keywords
License
Green

Abstract

Dendritic cells (DCs) regulate immunity and inflammation and respond to various stimuli, including cytokines. IL-1β is a key cytokine in the course of both acute and chronic inflammatory responses, making it indispensable for protection of the host, but also linking it to several diseases. Thus, IL-1β signaling must be tightly regulated. As suppressor of cytokine signaling (SOCS) proteins effectively control immune responses, we investigated the role of SOCS2 in IL-1β-induced DC activation. Human monocyte-derived DCs were stimulated with IL-1β, and SOCS2 mRNA and protein levels were measured. DC activation was assessed by cytokine secretion and surface marker expression. For functional analysis, small interfering RNA (siRNA)-based SOCS2 silencing was performed. SOCS2 expression was also analyzed in a curated NCBI GEO dataset of myeloid leukemia patients. We found IL-1β to be a potent inducer of SOCS2 expression. By silencing SOCS2, we showed that SOCS2 specifically limits IL-1β-induced IL-8 secretion. Moreover, our analysis revealed that SOCS2 levels are significantly increased in patients with acute and chronic myeloid leukemia, two hematological malignancies where disease progression is closely linked to IL-1β. This study identifies SOCS2 as a novel IL-1β-inducible target gene and points toward a potential role of SOCS2 in IL-1β-mediated DC activation.

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