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Regulation and regulatory activities of transforming growth factor beta
1Department of Medicine, University of Texas Health Science Center, San Antonio 78284-7877, USA.
Abstract:
Transforming growth factor beta (TGF beta) is unique among growth factors in its potent and widespread actions. Almost every cell in the body has been shown to make some form of TGF beta, and almost every cell has receptors for TGF beta. Therefore, it becomes apparent that this growth factor must be tightly regulated to prevent disease. The mechanisms of regulation of TGF beta are extensive and complex. One set of mechanisms centers around the fact that TGF beta is produced in a latent form that must be activated to produce biologically active TGF beta. These mechanisms include the latency of the molecule, the production of various latent forms, its targeting to cells for activation or to matrix for storage, and the means of activation of the latent forms. The TGF beta isoforms and the types, affinity, and signaling functions of its receptors also add complexity to the regulation of the effects of TGF beta. Active TGF beta regulates numerous processes in the body. TGF beta has three major biological effects: growth inhibition, stimulation of extracellular matrix formation, and immunosuppression. The means by which TGF beta regulates the expression of the numerous genes on which it has effects are complex and more information is needed. The means by which TGF beta regulates gene expression and the means by which the actions of TGF beta are regulated are addressed in this review.
Insights
Transforming growth factor beta (TGF-β) is a crucial regulator of cell growth, matrix formation, and immune responses. Its potent actions necessitate complex regulatory mechanisms, including latency and activation processes, to prevent disease.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Transforming growth factor beta (TGF-β) exerts potent and widespread biological effects.
- Nearly all cells produce and possess receptors for TGF-β, highlighting its systemic importance.
- Tight regulation of TGF-β is essential for preventing disease due to its broad impact.
Purpose of the Study:
- To review the extensive and complex mechanisms regulating TGF-β.
- To elucidate the multifaceted processes involved in TGF-β activation and signaling.
- To discuss how TGF-β controls gene expression and its own actions.
Main Methods:
- Review of existing literature on TGF-β regulation.
- Analysis of TGF-β latency, activation, and receptor interactions.
- Examination of TGF-β's effects on gene expression.
Main Results:
- TGF-β is produced in a latent form requiring activation for biological activity.
- Regulation involves latency, various latent forms, cellular targeting, and activation mechanisms.
- TGF-β isoforms, receptor types, affinity, and signaling pathways add regulatory complexity.
Conclusions:
- TGF-β's biological effects, including growth inhibition, matrix formation, and immunosuppression, are tightly controlled.
- The intricate mechanisms of TGF-β gene expression regulation and action modulation are critical.
- Further research is needed to fully understand TGF-β's regulatory pathways.