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Alterations in cell nuclei during apoptosis Rogalinska MCell Mol Biol Lett 2002[]; 7 (4): 995-1018Apoptosis is a genetically programmed phenomenon that aids in maintaining homeostasis in multicellular organisms. The characteristic morphological features of apoptosis are highly conservative and are dependent on the cell type and the apoptotic inducer. The nuclear events occurring during apoptosis include changes at the molecular level (i.e. DNA cleavage, modifications of nuclear polypeptides, and proteolysis of several proteins important for cell maintenance), and, consequently, alterations at the morphological level (i.e. chromatin condensation, nuclear shrinkage, DNA fragmentation and apoptotic body formation). These events are still not fully understood. It is very probable that a progressive decrease in pH could also be an essential factor for the induction of nuclease and protease activities, and an important element of the optimal conditions for their function. This review details the current state of knowledge on apoptotic nuclear events, with particular focus on the proteins involved in the execution of apoptosis in cell nuclei, and on the differences in substrate cleavage profiles for different types of cell undergoing cell death.|Animals[MESH]|Apoptosis/*physiology[MESH]|Cell Nucleus/*physiology[MESH]|Chromatin/metabolism[MESH]|DNA Fragmentation/physiology[MESH]|DNA/metabolism[MESH]|Humans[MESH]|Nuclear Proteins/metabolism[MESH] |
