There are many forms of cell death, most of which can be triggered by a variety of stimuli and physiological conditions. The often compared are apoptosis and necrosis. Apoptosis has become the focus of research area due to its complex nature and the different roles of maintaining healthy and self-sustaining biological entities. On the other hand, necrosis is a form of cell damage against acute external injury and trauma, leading to passive cell death and causing an inflammatory response. 
The BCl-2 family has been identified as its important role in apoptosis. The BH domain promotes interaction of family members with one another and may be indicative of pro-apoptotic or anti-apoptotic functions. Usually the BCL-2 family have been classified into one of three subfamilies; anti-apoptosis, BH3 only (pro-apoptotic) and pro-apoptotic proteins. The great promise for cancer therapy has been shown in recent research about BCL-2 targeting.
In the cell cycle, apoptosis acts as a fail-safe measure to prevent fidelity and proliferation quality. Although a certain degree of genetic variation is allowed and evolution is promoted, regenerative cells with extensive genetic errors and cell damage are subject to apoptosis. P53 is the Key role in the cell cycle system which initiate the apoptosis in certain cell types. P53 is a widely studied tumor suppressor. The p53 tumor suppressor gene is most frequently mutated in cancer cells (mutation occurs in more than 50% of human cancers) , which makes the restriction mechanism ineffective. Tumorigenesis is likely to commence when the p53-based preventive system loses its function completely.
Expression of stimuli, such as DNA damage, hypoxia and activation of certain oncoproteins (eg, Myc, Ras) are dependent on the apoptotic pathway of p53 . The transactivation function of p53 plays an important role in inducing apoptosis, the pro-apoptotic proteins, Bax and lgF-Bp3, are transcriptional targets of p53. As a well-known tumor suppressor, p53 is recognized for its ability to initiate apoptosis in the cell cycle and its ability to induce cell arrest and DNA repair in regenerative cells. In addition to p53, there are many other cell cycle regulators that can affect apoptosis (eg, pRb, p21).
Many studies have emphasized the importance of apoptosis in the self-defense mechanism or immune system. The immune system is responsible for rendering the host resistant to a variety of external pathogens. Apoptosis is an integral part of the immune system and helps maintain the homeostasis of the immune system. Secondly, the immune system relies on apoptosis to eliminate unwanted functional maturation of T cells and B cells . Finally, apoptosis confers cytotoxicity to certain cell types (ie, cytotoxic T lymphocytes and natural killer cells). A well-coordinated disruption protocol allows these cells to destroy target cells while the target cells remain intact. Cytotoxic T lymphocytes (CTLs) can induce target cell death in two ways, one of which involves perforin and granzymes.
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