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Cancer cell cycles
1Howard Hughes Medical Institute, Department of Tumor Cell Biology, St. Jude Children's Research Hospital, 332 North Lauderdale, Memphis, TN 38105, USA. sherr@stjude.org
Abstract:
Uncontrolled cell proliferation is the hallmark of cancer, and tumor cells have typically acquired damage to genes that directly regulate their cell cycles. Genetic alterations affecting p16(INK4a) and cyclin D1, proteins that govern phosphorylation of the retinoblastoma protein (RB) and control exit from the G1 phase of the cell cycle, are so frequent in human cancers that inactivation of this pathway may well be necessary for tumor development. Like the tumor suppressor protein p53, components of this "RB pathway," although not essential for the cell cycle per se, may participate in checkpoint functions that regulate homeostatic tissue renewal throughout life.
Insights
Cancer
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- Uncontrolled cell proliferation defines cancer, often due to damaged cell cycle regulatory genes.
- The retinoblastoma protein (RB) pathway, involving p16(INK4a) and cyclin D1, is crucial for cell cycle control.
- Alterations in the RB pathway are common in human cancers.
Purpose of the Study:
- To investigate the critical role of the retinoblastoma protein (RB) pathway in cancer development.
- To understand the significance of p16(INK4a) and cyclin D1 alterations in tumor formation.
- To explore the function of RB pathway components in tissue homeostasis.
Main Methods:
- Analysis of genetic alterations in key cell cycle regulators.
- Examination of p16(INK4a) and cyclin D1 protein functions.
- Comparison of RB pathway involvement in cancer versus normal tissue renewal.
Main Results:
- Frequent genetic damage to p16(INK4a) and cyclin D1 observed in human cancers.
- Inactivation of the RB pathway appears necessary for tumor development.
- RB pathway components may play a role in maintaining tissue renewal and homeostasis.
Conclusions:
- The RB pathway, including p16(INK4a) and cyclin D1, is a critical target in cancer.
- Dysregulation of this pathway is fundamental to the development of many human cancers.
- Components of the RB pathway contribute to cellular checkpoints and tissue maintenance.