nuclear condensation dna fragmentation in apoptosis

These features include chromatin aggregation nuclear and cytoplasmic condensation partition of cytoplasm and nucleus into membrane bound vesicles apoptotic bodies which contain ribosomes morphologically intact mitochondria and nuclear material. Apoptosis is a controlled process in which the cell s structural components are destroyed resulting in death of the cell. Recognized because of the characteristic appearance of nuclear chromatin condensation and fragmentation but this method is.
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Apoptosis is initiated by a tightly regulated signaling cascade that results in caspase activation. Apoptosis is morphologically characterised by chromatin condensation and dna degradation and is a mechanism used by the immune system for antigen induced clonal deletion of cortical thymocytes i e immune tolerance. Cell debris is packaged into apoptotic bodies which are then engulfed and digested by phagocytes.

Causes severe condensation of dna and loss of cell viability 48 49.

Nuclear condensation dna fragmentation in apoptosis. This early form of nuclear condensation is referred to as stage i condensation susin et al 2000. Widely used methods to determine apoptosis include the analysis of the genomic dna by agarose gel electrophoresis and dna fragmentation assays based on 3 h thymidine and alternatively 5 bromo 2 deoxy uridine. Cells undergoing apoptosis display blebbing cell shrinkage nuclear fragmentation and dna. Aif translocates to the nucleus and causes dna fragmentation into 50 300 kb pieces and condensation of peripheral nuclear chromatin joza et al 2001.

Widely used methods to determine apoptosis include the analysis of the genomic dna by agarose gel electrophoresis and dna fragmentation assays based on 3h thymidine and alternatively 5 bromo 2 deoxy uridine. Induction of apoptosis results in a cascade of characteristic biochemical events resulting in changes in cellular morphology and death. Apoptosis an intrinsic highly complex programme of auto orchestrated cell death which is as complex and important as proliferation. During apoptosis cells undergo characteristic shrinkage membrane blebbing nuclear fragmentation and chromatin condensation.

Several features characterize apoptosis including cell shrinkage membrane blebbing chromosome condensation nuclear fragmentation dna laddering and the eventual engulfment of the cell by phagosomes. This is different than cell death by necrosis necroptosis and pyroptosis. Changes associated with apoptosis directly affect the nucleus and its contents for example in the condensation of chromatin and the disintegration of the nuclear envelope and lamina. Exposure to hydrogen peroxide induced severe fragmentation of dna 71 of total dna in tail in control hek293 cells.

Cells undergoing apoptosis show characteristic morphological and biochemical features 6. Apoptosis known as programmed cell death is a carefully controlled energy dependent process of cell death. The methods involve the separation of fragmented low molecular weight dna from unfragmented high molecular weight dna in a given cell population.