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Apoptosis in neuroendocrine tumours
1Center for Molecular Medicine, School of Medicine, University of Connecticut Health Center, Farmington CT 06030-3101, USA. dwang@nso2.uchc.edu
Abstract:
Acquired resistance to apoptosis in neuroendocrine tumours (NETs) may promote clonal expansion and enhance the likelihood that subsequent mutations lead to growth or persistence of the neoplastic clone. Recent studies have demonstrated that deregulation of programmed cell death may be a critical component in multistep tumourigenesis of NETs and that the frequent expression of the Bcl-2 oncoprotein in these tumours may contribute to their pathogenesis. The genetic complementation of simultaneously deregulated Bcl-2 and c-Myc may be implicated in the multistep tumourigenesis of human NETs. Furthermore, because the efficacy of cytotoxic chemotherapy relies on its ability to induce programmed cell death, resistance to apoptosis typically correlates with chemoresistance, a phenomenon that is typical in NETs. Consideration of how oncogenes affect rates of cell death, in addition to augmenting growth, has already provided valuable insights into the biology of cancer. Understanding the molecular and cellular features of this process may enable the development and application of more effective and potentially curative treatment strategies in which the induction of programmed cell death is an integral component.
Insights
Neuroendocrine tumors (NETs) resist apoptosis, promoting cancer growth and chemoresistance. Targeting programmed cell death pathways offers potential for new NET treatments.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Research
Background:
- Acquired resistance to apoptosis contributes to neuroendocrine tumor (NET) clonal expansion and persistence.
- Deregulation of programmed cell death is critical in NET multistep tumorigenesis.
- Frequent Bcl-2 oncoprotein expression in NETs may play a role in their pathogenesis.
Purpose of the Study:
- To investigate the role of apoptosis resistance in neuroendocrine tumor development.
- To explore the potential link between Bcl-2, c-Myc, and NET multistep tumorigenesis.
- To understand how oncogenes influence cell death rates in cancer biology.
Main Methods:
- Analysis of apoptosis resistance mechanisms in NETs.
- Investigation of Bcl-2 and c-Myc genetic complementation in NETs.
- Correlation of apoptosis resistance with chemoresistance in NETs.
Main Results:
- Apoptosis resistance in NETs facilitates clonal expansion and tumor growth.
- Simultaneous deregulation of Bcl-2 and c-Myc may be implicated in human NET tumorigenesis.
- Apoptosis resistance typically correlates with chemoresistance in NETs.
Conclusions:
- Understanding apoptosis deregulation in NETs is crucial for pathogenesis.
- Targeting programmed cell death pathways may lead to more effective NET treatments.
- Inducing programmed cell death could be an integral component of curative NET therapies.