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* Department of Oncology and Surgical Sciences, University of Padua, Padua, Italy;
Experimental Immunology Branch, National Cancer Institute-National Institutes of Health, Bethesda, MD;
GSF-National Research Center for Environment and Health, Institut fuer Molekulare Virologie, Muenchen, Germany;
Immunotherapy and Gene Therapy Unit, Department of Experimental Oncology, Istituto Nazionale Tumori, Milan, Italy
We previously demonstrated that a specialized subset of immature
myeloid cells migrate to lymphoid organs as a result of tumor growth or
immune stress, where they suppress B and T cell responses to Ags.
Although NO was required for suppression of mitogen activation of T
cells by myeloid suppressor cells (MSC), it was not required for
suppression of allogenic responses. In this study, we describe a novel
mechanism used by MSC to block T cell proliferation and CTL generation
in response to alloantigen, which is mediated by the enzyme arginase 1
(Arg1). We show that Arg1 increases superoxide production in myeloid
cells through a pathway that likely utilizes the reductase domain of
inducible NO synthase (iNOS), and that superoxide is required for
Arg1-dependent suppression of T cell function. Arg1 is induced by IL-4
in freshly isolated MSC or cloned MSC lines, and is therefore
up-regulated by activated Th2, but not Th1, cells. In contrast, iNOS is
induced by IFN-
and Th1 cells. Because Arg1 and iNOS share
L-arginine as a common substrate, our results indicate that
L-arginine metabolism in myeloid cells is a potential
target for selective intervention in reversing myeloid-induced
dysfunction in tumor-bearing hosts.
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