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Development of TGF-beta resistance during malignant progression
1Laboratory of Cell Regulation and Carcinogenesis, National Cancer Institute, NIH, Bethesda, MD 20892-5055, USA.
Abstract:
Transforming growth factor-beta (TGF-beta) is the prototypical multifunctional cytokine, participating in the regulation of vital cellular activities such as proliferation and differentiation as well as a number of basic physiological functions. The effects of TGF-beta are critically dependent on the expression and distribution of a family of TGF-beta receptors, the TGF-beta types I, II, and III. It is now known that a wide variety of human pathology can be caused by aberrant expression and function of these receptors. The coding sequence of the type II receptor (RII) appears to render it uniquely susceptible to DNA replication errors in the course of normal cell division. By virtue of its key role in the regulation of cell proliferation, TGF-beta RII should be considered as a tumor suppressor gene. High levels of mutation in the TGF-beta RII gene have been observed in a wide range of primarily epithelial malignancies, including colon and gastric cancer. It appears likely that mutation of the TGF-beta RII gene may be a very critical step in the pathway of carcinogenesis.
Insights
Transforming growth factor-beta type II receptor (TGF-beta RII) mutations are common in epithelial cancers. These mutations in TGF-beta RII, a tumor suppressor gene, are critical steps in cancer development.
Area of Science:
- Molecular Biology
- Cellular Biology
- Oncology
Background:
- Transforming growth factor-beta (TGF-beta) is a key cytokine regulating cell proliferation and differentiation.
- TGF-beta's cellular effects depend on TGF-beta receptors (Types I, II, and III).
- Aberrant receptor expression and function are linked to human pathologies.
Purpose of the Study:
- To investigate the role of TGF-beta receptors in human pathology.
- To examine the susceptibility of the TGF-beta type II receptor (RII) coding sequence to DNA replication errors.
- To establish TGF-beta RII as a tumor suppressor gene.
Main Methods:
- Analysis of TGF-beta RII gene mutations.
- Observation of mutation levels in various malignancies.
Main Results:
- The TGF-beta RII coding sequence is uniquely susceptible to DNA replication errors.
- High mutation levels in the TGF-beta RII gene are observed in epithelial malignancies.
- Colon and gastric cancers show significant TGF-beta RII gene mutations.
Conclusions:
- TGF-beta RII functions as a tumor suppressor gene due to its role in cell proliferation regulation.
- Mutation of the TGF-beta RII gene is a critical step in carcinogenesis.
- TGF-beta RII mutations are prevalent in epithelial cancers.