Th17 Cells: a New Fate for Differentiating Helper T Cells

Overview

Journal Immunol Res

Specialty Allergy & Immunology

Date 2008 Jan 4

PMID 18172584

Citations 121

Authors

Zhi Chen

John J OShea

Affiliations

Soon will be listed here.

Abstract

Classically naïve CD4(+) have been thought to differentiate into two possible lineages, T helper 1 (Th1) or T helper 2 (Th2) cells. Within this paradigm the pathogenesis of autoimmunity was suggested to predominantly relate to Th1 cells and the production of IFN-gamma. However, there were many aspects of this model that did not seem to fit, not the least of which was that IFN-gamma was protective in some models of autoimmunity. During the past 2 years, remarkable progress has been made to characterize a new lineage of helper T cells. Designated Th17 cells, this lineage selectively produces proinflammatory cytokines including IL-17, IL-21, and IL-22. In the mouse, the differentiation of this new lineage is initiated by TGFbeta-1 and IL-6 and IL-21, which activate Stat3 and induce the expression of the transcription factor retinoic acid-related orphan receptor (RORgammat). IL-23, which also activates Stat3, apparently serves to maintain Th17 cells in vivo. In human cells, IL-1, IL-6, and IL-23 promote human Th17 differentiation, but TGFbeta-1 is reportedly not needed. Emerging data have suggested that Th17 plays an essential role in the host defense against extracellular bacteria and fungi and in pathogenesis of autoimmune diseases. Selectively targeting the Th17 lineage may be beneficial for the treatment of inflammatory and autoimmune diseases.

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