Transforming Growth Factor-beta Suppresses the Activation of CD8+ T-cells when Naive but Promotes Their Survival and Function Once Antigen Experienced: a Two-faced Impact on Autoimmunity

Overview

Journal Diabetes

Specialty Endocrinology

Date 2008 Aug 12

PMID 18689691

Citations 35

Authors

Christophe M Filippi

Amy E Juedes

Janine E Oldham

Ellie Ling

Lisa Togher

Yufeng Peng

Richard A Flavell

Matthias G von Herrath

Affiliations

Soon will be listed here.

Abstract

Objective: Transforming growth factor-beta (TGF-beta) can exhibit strong immune suppression but has also been shown to promote T-cell growth. We investigated the differential effect of this cytokine on CD8(+) T-cells in autoimmunity and antiviral immunity.

Research Design And Methods: We used mouse models for virally induced type 1 diabetes in conjunction with transgenic systems enabling manipulation of TGF-beta expression or signaling in vivo.

Results: Surprisingly, when expressed selectively in the pancreas, TGF-beta reduced apoptosis of differentiated autoreactive CD8(+) T-cells, favoring their expansion and infiltration of the islets. These results pointed to drastically opposite roles of TGF-beta on naïve compared with antigen-experienced/memory CD8(+) T-cells. Indeed, in the absence of functional TGF-beta signaling in T-cells, fast-onset type 1 diabetes caused by activation of naïve CD8(+) T-cells occurred faster, whereas slow-onset disease depending on accumulation and activation of antigen-experienced/memory CD8(+) T-cells was decreased. TGF-beta receptor-deficient CD8(+) T-cells showed enhanced activation and expansion after lymphocytic choriomeningitis virus infection in vivo but were more prone to apoptosis once antigen experienced and failed to survive as functional memory cells. In vitro, TGF-beta suppressed naïve CD8(+) T-cell activation and gamma-interferon production, whereas memory CD8(+) T-cells stimulated in the presence of TGF-beta showed enhanced survival and increased production of interleukin-17 in conjunction with gamma-interferon.

Conclusions: The effect of TGF-beta on CD8(+) T-cells is dependent on their differentiation status and activation history. These results highlight a novel aspect of the pleiotropic nature of TGF-beta and have implications for the design of immune therapies involving this cytokine.

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