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lüll Dynamic behavior and function of Foxp3+ regulatory T cells in tumor bearing host Qin FXCell Mol Immunol 2009[Feb]; 6 (1): 3-13Regulatory T cells (Tregs) expressing forkhead/winged-helix transcription factor Foxp3 represent a distinct lineage of lymphocytes which play a central role in protecting the host from autoimmune diseases. However, Tregs also pose a major problem to anti-tumor immunity. Growing body of evidence from both laboratory and clinical investigations has demonstrated that expansion and accumulation of these immunosuppressive cells correlates with advanced tumor growth and predicts poor disease prognosis. How tumor development subverts normal self-tolerance function of Tregs thereby thwarts host anti-tumor immunity remains elusive. This review will discuss our current knowledge in understanding the dynamics and plasticity of Foxp3+ Treg activation and induction in tumor bearing hosts and their interaction with various antigen presenting cells (APCs) in tumor microenvironment leading to the establishment of active local and systemic immune suppression.|Animals[MESH]|Antigen-Presenting Cells/*immunology[MESH]|Cytokines/metabolism[MESH]|Forkhead Transcription Factors/*metabolism[MESH]|Humans[MESH]|Immune Tolerance[MESH]|Lymphocyte Activation/immunology[MESH]|Neoplasms/*immunology[MESH]|T-Lymphocyte Subsets/*immunology[MESH]|T-Lymphocytes, Regulatory/*immunology[MESH] |