TY - CHAP M1 - Book, Section TI - Apoptosis Mechanisms: Relevance to the Hematopoietic System A1 - Reed, John C. 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 Y1 - 2015 N1 - T2 - Williams Hematology, 9e AB - SUMMARYApoptosis was originally coined to describe the morphologic features of a form of cell death characterized by cell shrinkage, membrane blebbing, and nuclear condensation. This type of cell death occurs in a wide variety of physiologic contexts, and thus is sometimes referred to as programmed cell death. Apoptosis occurs in all animal species as a means to balance cell proliferation with cell loss. The physiologic benefits of apoptosis include eliminating cells that are unneeded, defective, or infected, and maintenance of tissue homeostasis by continuously renewing adult tissues so as to maintain appropriate organ mass. In the hematopoietic system, production of leukocytes is delicately balanced against cell death, until a need arises for rapidly generating immune and inflammatory cells for combating pathogens. The life span of hematopoietic cells is regulated by numerous cytokines and lymphokines, as well as by signals derived from microanatomical niches through cell adhesion molecules and other regulators. Defects in the regulation of hematopoietic cell life span contribute to myriad diseases, including disorders characterized by inappropriate cell accumulation, such as leukemia, lymphoma, and autoimmunity, and diseases where pathologic loss of cells occurs, such as immunodeficiency and various blood dyscrasias. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/04/19 UR - accessmedicine.mhmedical.com/content.aspx?aid=1121089574 ER -