Journal
JOURNAL OF AUTOIMMUNITY
Volume 44, Issue -, Pages 13-20Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jaut.2013.06.009
Keywords
Regulatory T cells; Conventional T cells; T cell receptor; IL-2; Proliferation; Autoimmunity
Categories
Funding
- National Blood Foundation
- University of Pennsylvania internal funds
- National Institutes of Health [K08HL086503, K08NS062138, R01HL111501]
- NATIONAL HEART, LUNG, AND BLOOD INSTITUTE [R01HL111501, R01HL107589, K08HL086503] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF NEUROLOGICAL DISORDERS AND STROKE [K08NS062138] Funding Source: NIH RePORTER
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Strategies to expand regulatory T cells hold therapeutic potential for ameliorating T cell-mediated autoimmunity. Recently, we reported that the requirements for T cell receptor signaling in conventional T cell and regulatory T cell proliferation are different. Using mutant mice that display defective T cell receptor-mediated phospholipase C gamma (PLC gamma) activation, we hereby demonstrate that PLC gamma activation is required for antigen-specific conventional T cell proliferation but not for IL-2-induced regulatory T cell proliferation. This led us to hypothesize that in conjunction with IL-2, pharmacological inhibition of T cell receptor-mediated PLC gamma activation might offer a novel therapeutic strategy to expand regulatory T cells while simultaneously inhibiting conventional T cell proliferation. Indeed, using the calcineurin inhibitor Cyclosporine A to inhibit signaling downstream of PLC gamma, we found that Cyclosporine A attenuated antigen-specific Tconv proliferation but permitted IL-2-induced regulatory T cell expansion in vitro and in vivo. Furthermore, the combination of Cyclosporine A and IL-2 was superior over either Cyclosporine A or IL-2 monotherapy in protection against the T cell-mediated demyelinating autoimmune disease mouse model, experimental autoimmune encephalomyelitis. Thus, a combination of TCR signaling inhibition and IL-2 might be a beneficial strategy in expanding regulatory T cells and inhibiting conventional T cell proliferation in autoimmune settings. (C) 2013 Elsevier Ltd. All rights reserved.
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