alexa Tumor-induced tolerance and immune suppression depend on the C EBPbeta transcription factor.
Toxicology

Toxicology

Journal of Drug Metabolism & Toxicology

Author(s): Marigo I, Bosio E, Solito S, Mesa C, Fernandez A, , Marigo I, Bosio E, Solito S, Mesa C, Fernandez A,

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Abstract Tumor growth is associated with a profound alteration in myelopoiesis, leading to recruitment of immunosuppressive cells known as myeloid-derived suppressor cells (MDSCs). We showed that among factors produced by various experimental tumors, the cytokines GM-CSF, G-CSF, and IL-6 allowed a rapid generation of MDSCs from precursors present in mouse and human bone marrow (BM). BM-MDSCs induced by GM-CSF+IL-6 possessed the highest tolerogenic activity, as revealed by the ability to impair the priming of CD8(+) T cells and allow long term acceptance of pancreatic islet allografts. Cytokines inducing MDSCs acted on a common molecular pathway and the immunoregulatory activity of both tumor-induced and BM-derived MDSCs was entirely dependent on the C/EBPbeta transcription factor. Adoptive transfer of tumor antigen-specific CD8(+) T lymphocytes resulted in therapy of established tumors only in mice lacking C/EBPbeta in the myeloid compartment, suggesting that C/EBPbeta is a critical regulator of the immunosuppressive environment created by growing cancers. Copyright 2010 Elsevier Inc. All rights reserved. This article was published in Immunity and referenced in Journal of Drug Metabolism & Toxicology

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