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Cancer therapy lexicon

Tudástár

A (3) B (7) C (12) E (2) G (1) H (2) I (4) L (4) M (5) N (2) O (7) P (13) Q (1) R (11) S (6) T (6) U (1) V (2) W (2) X (1)

N

National Cancer Institute

Research center in Bethesda, Maryland for supporting a broad portfolio of research helping the early detection and diagnosis of cancer and its precursors. 

Website of the institute: https://www.cancer.gov/ 

The primary way to destroy a cell is necrosis. This effect is a massive, unconditional stimuli accompanied by severe hypoxia and liberation of toxins. In fact no internal energy is used from the biosystem to reach this state. Cells swell in their integrity and in parts (organelles) also. The cell disintegration is complete. Disruption of organelles, DNA breakdown and lyses of plasma membrane occur. The process stimulates inflammation and neutrophil infiltration to degrade dead cells. The process is toxic. This process includes pathologic and physiologic stimuli using internal energy sources (ATP) to perform the process. Contrary to necrosis it affects usually scattered individual cells, causing death of isolated cells. Contrary also to necrosis the cells contract, shrink in this process, chromatin condenses and apoptotic bodies are formed. DNA laddering occurs, the DNA is fragmented to base-pair units. The cell membrane is not lysed, only becomes blebby. Apoptosis is generally not inflammatory, and no neutrophil infiltration occurs; the apoptotic bodies are phagocytized and intact. The final state could be a secondary necrosis or more likely a phagocytosis ends the process. Necrosis is more abrupt than apoptosis, which takes more time to be performed. This enhanced time from initialization to completion works in apoptosis like a “memory,” which accomplishes a definite program by the given stimuli.