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and IL-10 Induce the Differentiation of Human Type 1 T Regulatory Cells1

*
San Raffaele Telethon Institute for Gene Therapy (HSR-TIGET), Milan, Italy; and
DNAX Research Institute, Palo Alto, CA 94304
CD4+ T regulatory type 1 (Tr1) cells suppress
Ag-specific immune responses in vitro and in vivo. Although IL-10 is
critical for the differentiation of Tr1 cells, the effects of other
cytokines on differentiation of naive T cells into Tr1 cells have not
been investigated. Here we demonstrate that endogenous or exogenous
IL-10 in combination with IFN-
, but not TGF-
, induces naive
CD4+ T cells derived from cord blood to differentiate into
Tr1 cells:
IL-10+IFN-
+IL-2-/lowIL-4-.
Naive CD4+ T cells derived from peripheral blood require
both exogenous IL-10 and IFN-
for Tr1 cell differentiation. The
proliferative responses of the Tr1-containing lymphocyte populations,
following activation with anti-CD3 and anti-CD28 mAbs, were
reduced. Similarly, cultures containing Tr1 cells displayed reduced
responses to alloantigens via a mechanism that was partially mediated
by IL-10 and TGF-
. More importantly, Tr1-containing populations
strongly suppressed responses of naive T cells to alloantigens.
Collectively, these results show that IFN-
strongly enhances
IL-10-induced differentiation of functional Tr1 cells, which represents
a first major step in establishing specific culture conditions to
generate T regulatory cells for biological and biochemical analysis,
and for cellular therapy to induce peripheral tolerance in
humans.
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