CD200-CD200R signaling suppresses anti-tumor responses independently of CD200 expression on the tumor.
Summary of "CD200-CD200R signaling suppresses anti-tumor responses independently of CD200 expression on the tumor."
Expression of CD200, the gene encoding the ligand for the inhibitory immune receptor CD200R, is an independent prognostic factor for various forms of leukemia predicting worse overall survival of the patients. The enhanced expression of CD200 on the tumors implies that anti-tumor responses can be enhanced by blockage of the CD200-CD200R interaction. Indeed, antibody-mediated blockade of the CD200-CD200R inhibitory axis is currently evaluated in clinical tests to boost immune responses against CD200-expressing tumors. Here, we show that mice lacking CD200, the exclusive ligand for CD200R, are resistant to chemical skin carcinogenesis. Importantly, CD200R controls tumor outgrowth independently of CD200 expression by the tumor cells themselves. Furthermore, Cd200(-/-) mice do not become tolerant to intranasally administered antigens, suggesting that tumor rejection is normally suppressed through CD200-induced immune tolerance. Decreased tumor outgrowth is accompanied by increased expression of the proinflammatory cytokines interleukin (IL)-1β and IL-6 by the lymph node (LN) dendritic cells. During carcinogenesis, skin-draining LNs of Cd200(-/-) mice contain increased numbers of IL-17-producing FoxP3(+) cells, which preferentially home to the tumors. Thus, the CD200-CD200R axis induces tolerance to external and tumor antigens and influences the T-regulatory/Th17 cell ratio. We demonstrate for the first time that the absence of CD200R signaling inhibits outgrowth of an endogenous tumor irrespective of CD200 expression by the tumor cells. This important paradigm shift leads to a much broader applicability of CD200-blockade in the treatment of tumors.Oncogene advance online publication, 24 October 2011; doi:10.1038/onc.2011.477.
Department of Immunology, University Medical Center Utrecht, Utrecht, The Netherlands.
This article was published in the following journal.
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/22020332
- DOI: http://dx.doi.org/10.1038/onc.2011.477
Medical and Biotech [MESH] Definitions
Tumor Necrosis Factor Decoy Receptors
A subclass of tumor necrosis family receptors that lack cell signaling domains. They bind to specific TNF RECEPTOR LIGANDS and are believed to play a modulating role in the TNF signaling pathway. Some of the decoy receptors are products of distinct genes, while others are products of ALTERNATIVE SPLICING of the MRNA for the active receptor.
Receptors, Tumor Necrosis Factor, Member 6b
A secreted tumor necrosis factor receptor family member that has specificity FAS LIGAND and TUMOR NECROSIS FACTOR LIGAND SUPERFAMILY MEMBER 14. It plays a modulating role in tumor necrosis factor signaling pathway.
Receptors, Tumor Necrosis Factor, Type I
A tumor necrosis factor receptor subtype that has specificity for TUMOR NECROSIS FACTOR ALPHA and LYMPHOTOXIN ALPHA. It is constitutively expressed in most tissues and is a key mediator of tumor necrosis factor signaling in the vast majority of cells. The activated receptor signals via a conserved death domain that associates with specific TNF RECEPTOR-ASSOCIATED FACTORS in the CYTOPLASM.
Receptors, Tumor Necrosis Factor, Type Ii
A tumor necrosis factor receptor subtype that is expressed primarily in IMMUNE SYSTEM cells. It has specificity for membrane-bound form of TUMOR NECROSIS FACTORS and mediates intracellular-signaling through TNF RECEPTOR ASSOCIATED FACTORS.
Death Domain Receptor Signaling Adaptor Proteins
Intracellular signaling adaptor proteins that bind to the cytoplasmic death domain region found on DEATH DOMAIN RECEPTORS. Many of the proteins in this class take part in intracellular signaling from TUMOR NECROSIS FACTOR RECEPTORS.
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