Journal
NATURE REVIEWS IMMUNOLOGY
Volume 4, Issue 6, Pages 432-444Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nri1375
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Because of their phagocytic activity and their ability to differentiate into antigen-presenting cells, monocytes participate in both innate and adaptive immune responses. They derive from bone-marrow progenitor cells, circulate in the blood as monocytes and differentiate into tissue macrophages or myeloid dendritic cells in the periphery. After activation by an antigenic challenge in the tissues, they can contribute to the local resolution of the injury or can migrate farther to secondary lymphoid organs. Recruitment of these cells from the blood to the tissue and from the tissue to the lymph nodes requires orchestrated adhesive interactions between leukocytes and the vascular or lymphatic endothelium. Here, we discuss the signals by which chemokines regulate the leukocyte-adhesion molecules that are essential for transendothelial migration, and we describe the routes taken by monocytes and myeloid dendritic cells to reach their final destination.
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