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Cancer Immunol Immunother. 2006 Mar;55(3):237-45. Epub 2005 Jul 27.

Role of immature myeloid cells in mechanisms of immune evasion in cancer.

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H. Lee Moffitt Cancer Center and Research Institute and The Department of Interdisciplinary Oncology, University of South Florida, MRC 2067, 12902 Magnolia Dr, Tampa, FL 33612, USA.


Tumor affects myelopoiesis by inhibiting the process of differentiation/maturation of antigen-presenting cells from their myeloid precursors and by stimulating an accumulation of immature myeloid cells in cancer patients and tumor-bearing mice. These immature myeloid cells can contribute greatly to tumor progression and promote tumor evasion from immune attack: i) by inhibiting development of adaptive immune responses against tumor in lymphoid organs; ii) by migrating into tumor site and differentiating there into highly immune suppressive tumor-associated macrophages. Immature myeloid cells and tumor-associated macrophages utilize different JAK/STAT signaling pathways and different mechanisms to control T cell responses, which include increased production of TGF-beta, reactive oxygen species, peroxynitrites, as well as enhanced L-arginine metabolism. Understanding of precise mechanisms, which tumors use to affect differentiation of APC from myeloid cell precursors and inhibit T cell responses, could help to develop new approaches for cancer therapy and substantially improve efficiency of existing cancer vaccination strategies.

[Indexed for MEDLINE]
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