Journal
CELLULAR AND MOLECULAR LIFE SCIENCES
Volume 69, Issue 6, Pages 897-914Publisher
SPRINGER BASEL AG
DOI: 10.1007/s00018-011-0848-6
Keywords
Macrophages; Lymphangiogenesis; Lymphatic endothelial cells; Tumor; Inflammation; VEGF-A/-C/-D; VEGFR-2/-3
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The lymphatic system provides important functions for tissue fluid homeostasis and immune response. Lymphangiogenesis, the formation of new lymphatics, comprises a series of complex cellular events in vitro or in vivo, e.g., proliferation, differentiation, and sprouting. Recent evidence has implied that macrophages act as a direct structural contributor to lymphatic endothelial walls or secret VEGF-C/-D and VEGF-A to initiate lymphangiogenesis in inflamed or tumor tissues. Bone marrow-derived macrophages are versatile cells that express different functional programs in response to exposure to microenvironmental signals, and can be identified by specific expression of a number of proteins, F4/80, CD11b, and CD68. Several causative factors, e.g., NF-kappa B, IL-1 beta, TNF-alpha, SDF-1, M-CSF, especially TonEBP/VEGF-C signaling, may be actively involved in macrophage-induced lymphangiogenesis. Alteration of macrophage phenotype and function has a profound effect on the development and progression of inflammation and malignancy, and macrophage depletion for controlling lymphangiogenesis may provide a novel approach for prevention and treatment of lymphatic-associated diseases.
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