Abstract:
:CD4(+)CD25(hi)Foxp3(+) regulatory T cells (T(regs)) are critical mediators of self-tolerance, which is crucial for the prevention of autoimmune disease, but T(regs) can also inhibit antitumor immunity. T(regs) inhibit the proliferation of CD4(+)CD25(-) conventional T cells (T(cons)), as well as the ability of these cells to produce effector cytokines; however, the molecular mechanism of suppression remains unclear. Here, we showed that human T(regs) rapidly suppressed the release of calcium ions (Ca(2+)) from intracellular stores in response to T cell receptor (TCR) activation in T(cons). The inhibition of Ca(2+) signaling resulted in decreased dephosphorylation, and thus decreased activation, of the transcription factor nuclear factor of activated T cells 1 (NFAT1) and reduced the activation of nuclear factor κB (NF-κB). In contrast, Ca(2+)-independent events in T(cons), such as TCR-proximal signaling and activation of the transcription factor activator protein 1 (AP-1), were not affected during coculture with T(regs). Despite suppressing intracellular Ca(2+) mobilization, coculture with T(regs) did not block the generation of inositol 1,4,5-trisphosphate in TCR-stimulated T(cons). The T(reg)-induced suppression of the activity of NFAT and NF-κB and of the expression of the gene encoding the cytokine interleukin-2 was reversed in T(cons) by increasing the concentration of intracellular Ca(2+). Our results elucidate a previously unrecognized and rapid mechanism of T(reg)-mediated suppression. This increased understanding of T(reg) function may be exploited to generate possible therapies for the treatment of autoimmune diseases and cancer.
journal_name
Sci Signaljournal_title
Science signalingauthors
Schmidt A,Oberle N,Weiss EM,Vobis D,Frischbutter S,Baumgrass R,Falk CS,Haag M,Brügger B,Lin H,Mayr GW,Reichardt P,Gunzer M,Suri-Payer E,Krammer PHdoi
10.1126/scisignal.2002179subject
Has Abstractpub_date
2011-12-20 00:00:00pages
ra90issue
204eissn
1945-0877issn
1937-9145pii
4/204/ra90journal_volume
4pub_type
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