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P53, cell cycle control and apoptosis: implications for cancer
M B Kastan1, C E Canman, C J Leonard
1Johns Hopkins Oncology Center, Baltimore, Maryland, USA.
Abstract:
Cellular proliferation depends on the rates of both cell division and cell death. Tumors frequently have decreased cell death as a primary mode of increased cell proliferation. Genetic changes resulting in loss of programmed cell death (apoptosis) are likely to be critical components of tumorigenesis. Many of the gene products which appear to control apoptotic tendencies are regulators of cell cycle progression; thus, cell cycle control and cell death appear to be tightly linked processes. P53 protein is an example of a gene product which affects both cell cycle progression and apoptosis. The ability of p53 overexpression to induce apoptosis may be a major reason why tumor cells frequently disable p53 during the transformation process. Unfortunately, the same genetic changes which cause loss of apoptosis during tumor development, may also result in tumor cell resistance to anti-neoplastic therapies which kill tumor cells by apoptosis. Elucidation of the genetic and biochemical controls of these cellular responses may provide insights into ways to induce cell death and thus hopefully suggest new targets for improving therapeutic index in the treatment of malignancies.
Insights
Tumor growth often involves reduced programmed cell death (apoptosis). Understanding the links between cell cycle control and apoptosis, particularly involving p53, may reveal new cancer treatment targets.
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- Cellular proliferation is regulated by the balance between cell division and cell death.
- Tumors often exhibit increased proliferation due to decreased programmed cell death (apoptosis).
- Genetic alterations leading to apoptosis evasion are key in tumorigenesis.
Purpose of the Study:
- To explore the intricate relationship between cell cycle progression and apoptosis.
- To understand the role of p53 in regulating both cell cycle and apoptosis.
- To identify potential therapeutic targets for enhancing anti-cancer treatments by inducing apoptosis.
Main Methods:
- The study focuses on the genetic and biochemical mechanisms controlling cellular proliferation and apoptosis.
- It examines the function of p53 protein in cell cycle regulation and its role in inducing apoptosis.
- The research investigates how genetic changes affecting apoptosis influence tumor development and therapy resistance.
Main Results:
- Loss of apoptosis is a critical factor in tumor development and is linked to cell cycle dysregulation.
- p53 protein plays a significant role in controlling both cell cycle progression and apoptosis.
- Genetic alterations that promote tumor survival by inhibiting apoptosis also confer resistance to cancer therapies.
Conclusions:
- The tight linkage between cell cycle control and apoptosis is crucial for understanding cancer biology.
- Targeting the mechanisms that control apoptosis, especially those involving p53, holds promise for novel cancer therapies.
- Elucidating these pathways could lead to strategies to overcome therapeutic resistance and improve patient outcomes in malignancies.