TY - CHAP M1 - Book, Section TI - Production, Distribution, and Activation of Monocytes and Macrophages A1 - Douglas, Steven D. A1 - Douglas, Anne G. A2 - Kaushansky, Kenneth A2 - Lichtman, Marshall A. A2 - Prchal, Josef T. A2 - Levi, Marcel M. A2 - Press, Oliver W. A2 - Burns, Linda J. A2 - Caligiuri, Michael PY - 2015 T2 - Williams Hematology, 9e AB - SUMMARYMonocytes and macrophages play an important role in human biology, both as a component of the hematopoietic system and within the stroma and tissue microenvironment where they contribute trophic and clearance functions. They constitute a widely dispersed cellular system throughout the body, interacting with host cells and foreign invaders through their versatile biosynthetic and secretory responses, to maintain physiologic homeostasis. They are specialized migratory or sessile phagocytes, present within the circulation and extravascular tissue compartment, contributing to diverse pathologic processes directly and through their production of bioactive products. Because of their extensive heterogeneity and plasticity, the centrality of monocytes and their progeny has not always been recognized by hematologists. The origin, life span, and functions of the monocyte are the focus of this chapter, including their relevance to health and disease in humans, based on current understanding of their properties. The relationship of monocytes and macrophages to dendritic cells, and monocyte-derived cells with a specialized immunologic role in T-lymphocyte activation, are described. Together, macrophages and dendritic cells are major antigen-presenting cells, contributing to host defense, innate and acquired immunity, and inflammation, as well as noninfectious disease processes, both within and outside the lymphohematopoietic organs. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/04/19 UR - hemonc.mhmedical.com/content.aspx?aid=1121096382 ER -