apoptosis
(ap"o-to\'sis)
Programmed cell death. The fragmentation of a cell into membrane-bound particles that are eliminated by phagocytosis. Apoptosis is a physiological suicide mechanism that preserves homeostasis and occurs during normal tissue turnover. It is responsible for cell death in pathological circumstances, such as exposure to low concentrations of xenobiotics and infections by HIV and various other viruses. Apoptotic cells display profound structural changes such as plasma membrane blebbing and nuclear collapse. DNA is cleaved into short oligonucleosomal length DNA fragments. Apoptosis usually occurs after the activation ofr calcium-dependent endogenous endonuclease.

Microbiology. . 2009.

Look at other dictionaries:

  • Apoptosis — (IPA en|ˌæpəpˈtoʊsəs [ [http://www.webster.com/dictionary/apoptosis Webster.com dictionary entry] ] ) is a form of programmed cell death in multicellular organisms. It is one of the main types of programmed cell death (PCD) and involves a series… …   Wikipedia

  • Apoptosis — apoptosis. f. Biol. Modalidad específica de muerte celular, implicada en el control del desarrollo y el crecimiento. * * * La muerte celular programada o apoptosis es el conjunto de reacciones bioquímicas que ocurren en las células cuando se… …   Enciclopedia Universal

  • apoptosis — f. citol. Mecanismo mediante el cual, a partir de una serie de procesos moleculares, la célula muere. Este proceso permite eliminar las células del cuerpo cuando no son necesarias o cuando son defectuosas. Este proceso de suicidio celular no es… …   Diccionario médico

  • apoptosis — apoptosis. См. апоптоз. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • apoptosis — f. Biol. Modalidad específica de muerte celular, implicada en el control del desarrollo y el crecimiento …   Diccionario de la lengua española

  • Apoptosis — La apoptosis es una forma de muerte celular, que está regulada genéticamente. La muerte celular programada es parte integral del desarrollo de los tejidos tanto de plantas como de animales pluricelulares (metazoa). En animales, la forma de muerte …   Wikipedia Español

  • apoptosis — ap·op·to·sis (ăp əp tōʹsĭs, ăp ə tōʹ ) n. Disintegration of cells into membrane bound particles that are then eliminated by phagocytosis or by shedding. * * * or programmed cell death Mechanism that allows cells to self destruct when stimulated… …   Universalium

  • Apoptosis — A form of cell death in which a programmed sequence of events leads to the elimination of cells without releasing harmful substances into the surrounding area. Apoptosis is also called programmed cell death or cell suicide. Apoptosis plays a… …   Medical dictionary

  • apoptosis — n. programmed cell death, which results in the ordered removal of cells and occurs naturally as part of the normal development, maintenance, and renewal of cells, tissues, and organs. During embryonic development, for example, the fingers are… …   The new mediacal dictionary

  • apoptosis — The most common form of physiological (as opposed to pathological) cell death. Apoptosis is an active process requiring metabolic activity by the dying cell; often characterized by shrinkage of the cell, cleavage of the DNA into fragments that… …   Dictionary of molecular biology

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