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    Modulation of Tumor Tolerance in Primary Central Nervous System Malignancies

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    Authors
    Johnson, Theodore S.
    Munn, David H.
    Maria, Bernard L.
    Issue Date
    2012-01-24
    URI
    http://hdl.handle.net/10675.2/776
    
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    Abstract
    Central nervous system tumors take advantage of the unique immunology of the CNS and develop exquisitely complex stromal networks that promote growth despite the presence of antigen-presenting cells and tumor-infiltrating lymphocytes. It is precisely this immunological paradox that is essential to the survival of the tumor. We review the evidence for functional CNS immune privilege and the impact it has on tumor tolerance. In this paper, we place an emphasis on the role of tumor-infiltrating myeloid cells in maintaining stromal and vascular quiescence, and we underscore the importance of indoleamine 2,3-dioxygenase activity as a myeloid-driven tumor tolerance mechanism. Much remains to be discovered regarding the tolerogenic mechanisms by which CNS tumors avoid immune clearance. Thus, it is an open question whether tumor tolerance in the brain is fundamentally different from that of peripheral sites of tumorigenesis or whether it simply stands as a particularly strong example of such tolerance.
    Citation
    Clin Dev Immunol. 2012 Jan 24; 2012:937253
    ae974a485f413a2113503eed53cd6c53
    10.1155/2012/937253
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