551. Down-modulation of CXCR3 surface expression and function in CD8+ T cells from cutaneous T cell lymphoma patients.
- Author
-
Winter D, Moser J, Kriehuber E, Wiesner C, Knobler R, Trautinger F, Bombosi P, Stingl G, Petzelbauer P, Rot A, and Maurer D
- Subjects
- CD8-Positive T-Lymphocytes pathology, Cell Membrane, Cell Movement immunology, Cells, Cultured, E-Selectin biosynthesis, E-Selectin metabolism, Endosomes metabolism, Endothelial Cells metabolism, Humans, Immunologic Memory, K562 Cells, L-Selectin biosynthesis, Ligands, Lymphoma, T-Cell, Cutaneous metabolism, Lymphoma, T-Cell, Cutaneous pathology, Lymphoma, T-Cell, Cutaneous therapy, Lysosomes metabolism, Receptors, CXCR3, Receptors, Chemokine physiology, Resting Phase, Cell Cycle immunology, Skin Neoplasms metabolism, Skin Neoplasms pathology, Skin Neoplasms therapy, Tumor Cells, Cultured, Vascular Cell Adhesion Molecule-1 biosynthesis, Vascular Cell Adhesion Molecule-1 metabolism, CD8-Positive T-Lymphocytes immunology, CD8-Positive T-Lymphocytes metabolism, Down-Regulation immunology, Lymphoma, T-Cell, Cutaneous immunology, Receptors, Chemokine antagonists & inhibitors, Receptors, Chemokine biosynthesis, Skin Neoplasms immunology
- Abstract
Viruses can escape destruction by the immune system by exploitation of the chemokine-chemokine receptor system. It is less established whether human cancers can adopt similar strategies to evade immunologic control. In this study, we show that advanced cutaneous T cell lymphoma (CTCL) is associated with selective and efficient inactivation of CXCR3-dependent T cell migration. Our studies demonstrate that this alteration is at least in part due to CXCR3 down-regulation in vivo by elevated serum levels of CXCR3 ligands. The T cell population most affected by this down-regulatory mechanism are CD8+ cytotoxic effector T cells. In CTCL patients, cytotoxic effector T cells have strongly reduced surface CXCR3 expression, accumulate in peripheral blood, but are virtually absent from CTCL tumor lesions, indicating an inability to extravasate into lymphoma tissue. CTCL-associated inactivation of effector cell recruitment may be a paradigmatic example of a new type of immune escape mechanisms shielding the neoplasm from a tumoricidal attack.
- Published
- 2007
- Full Text
- View/download PDF