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Inducible costimulator promotes helper T-cell differentiation through phosphoinositide 3-kinase
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Journal Article
Inducible costimulator promotes helper T-cell differentiation through phosphoinositide 3-kinase
2009
Overview
The T-cell costimulatory receptors, CD28 and the inducible costimulator (ICOS), are required for the generation of follicular B helper T cells (TFH) and germinal center (GC) reaction. A common signal transducer used by CD28 and ICOS is the phosphoinositide 3-kinase (PI3K). Although it is known that CD28-mediated PI3K activation is dispensable for GC reaction, the role of ICOS-driven PI3K signaling has not been defined. We show here that knock-in mice that selectively lost the ability to activate PI3K through ICOS had severe defects in TFH generation, GC reaction, antibody class switch, and antibody affinity maturation. In preactivated CD4⁺ T cells, ICOS delivered a potent PI3K signal that was critical for the induction of the key TFH cytokines, IL-21 and IL-4. Under the same settings, CD28 was unable to activate PI3K but supported a robust secondary expansion of T cells. Thus, our results demonstrate a nonredundant function of ICOS-PI3K pathway in the generation of TFH and suggest that CD28 and ICOS play differential roles during a multistep process of TFH differentiation.
Publisher
National Academy of Sciences,National Acad Sciences
Subject
/ Antigens, Differentiation, T-Lymphocyte - immunology
/ Antigens, Differentiation, T-Lymphocyte - metabolism
/ Blasts
/ CD4-Positive T-Lymphocytes - metabolism
/ Cell Differentiation - immunology
/ Cells
/ Enzyme-Linked Immunosorbent Assay
/ Inducible T-Cell Co-Stimulator Protein
/ Kinases
/ Ligation
/ Mice
/ phosphatidylinositol 3-kinase
/ Phosphatidylinositol 3-Kinases - immunology
/ Phosphatidylinositol 3-Kinases - metabolism
/ Rodents
