Elevated IL-6 expression in CD4 T cells via PKCθ and NF-κB induces Th2 cytokine production

M. Hanief Sofi, Wei Li, Mark H. Kaplan, Cheong Hee Chang

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

T helper (Th) cell differentiation is a key event to mount an appropriate immune response. Th1 and Th2 cells produce their signature cytokines IFN-γ and IL-4, respectively. However, as we have reported, CD4 T cells selected by MHC class II-expressing thymocytes (T-CD4) produce both Th1 and Th2 type cytokines under Th1 differentiation conditions. Furthermore, the expression of Th2 cytokines in these cells is Stat6 independent. In the current study, we investigated the molecular mechanisms by which CD4 T cells produce Th2 cytokines under the Th1 differentiation condition. We observed that IL-6 is highly expressed in T-CD4 T cells, which is at least partly responsible for Th2 cytokine production by Th1 differentiated cells. The enhanced expression of IL-6 is downstream of constitutive phosphorylation of PKCθ and high NF-κB activity. Neutralizing IL-6, blocking PKCθ phosphorylation, or inhibiting NF-κB translocation diminished Th2 cytokine expression in Th1 cultures. Therefore, our study revealed that autocrine IL-6 production can induce Th2 cytokine production, and that PKCθ and NF-κB are essential components in the induction of IL-6-mediated Th2 development.

Original languageEnglish (US)
Pages (from-to)1443-1450
Number of pages8
JournalMolecular Immunology
Volume46
Issue number7
DOIs
StatePublished - Apr 1 2009

Keywords

  • Cytokines
  • Rodents
  • Signal transduction
  • T cells

ASJC Scopus subject areas

  • Molecular Biology
  • Immunology

Fingerprint Dive into the research topics of 'Elevated IL-6 expression in CD4 T cells via PKCθ and NF-κB induces Th2 cytokine production'. Together they form a unique fingerprint.

Cite this