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Transforming growth factor-beta and suppression of carcinogenesis
M B Sporn1, A B Roberts, L M Wakefield
1Laboratory of Chemoprevention, National Cancer Institute, Bethesda, Maryland 20892.
Abstract:
Transforming growth factor-beta (TGF-beta) plays an important role in controlling proliferation or differentiation in almost all epithelial tissues. The pathophysiology of TGF-beta during carcinogenesis is now an important area of investigation, since it appears that as the process of carcinogenesis progresses, epithelial cells often become refractory to the growth-regulatory actions of TGF-beta. In this article we consider the possible cellular and molecular bases for this phenomenon, and then discuss some pharmacological approaches to enhancing the synthesis or activity of TGF-beta. These approaches may provide new modalities for prevention of carcinogenesis, if they can be applied during the early stages of the disease process, before cells become refractory. We give particular attention to tamoxifen and retinoic acid, since it has been shown that these agents, which are of known efficacy for prevention of cancer, can markedly enhance the secretion of specific isotypes of TGF-beta by several types of cells.
Insights
Transforming growth factor-beta (TGF-beta) is crucial for epithelial cell growth. Cancer cells can become resistant to TGF-beta, but agents like tamoxifen may restore its function for cancer prevention.
Area of Science:
- Molecular biology
- Cell biology
- Cancer research
Background:
- Transforming growth factor-beta (TGF-beta) regulates proliferation and differentiation in epithelial tissues.
- During carcinogenesis, epithelial cells often lose sensitivity to TGF-beta's growth-regulatory effects.
- Understanding TGF-beta's role in cancer progression is critical.
Purpose of the Study:
- To explore the cellular and molecular mechanisms behind TGF-beta insensitivity in carcinogenesis.
- To discuss pharmacological strategies for enhancing TGF-beta synthesis or activity.
- To evaluate the potential of these strategies for early cancer prevention.
Main Methods:
- Review of existing literature on TGF-beta in carcinogenesis.
- Analysis of cellular and molecular bases for TGF-beta resistance.
- Discussion of pharmacological agents like tamoxifen and retinoic acid.
Main Results:
- Epithelial cells frequently develop refractoriness to TGF-beta during cancer development.
- Tamoxifen and retinoic acid have demonstrated the ability to enhance TGF-beta secretion.
- These agents show potential for cancer prevention by modulating TGF-beta signaling.
Conclusions:
- TGF-beta insensitivity is a key feature in cancer pathophysiology.
- Pharmacological enhancement of TGF-beta offers promising avenues for cancer prevention.
- Early intervention with agents like tamoxifen and retinoic acid may be effective before cells become refractory.