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[Transforming growth factor-beta and its receptors]
1Department of Biochemistry, Cancer Institute, Tokyo, Japan.
Abstract:
Transforming growth factor-beta (TGF-beta) is a family of multifunctional proteins that inhibit the growth of most cell types, and these proteins induce the deposition of extracellular matrix. TGF-beta inhibits the growth and migration of endothelial cells in vitro, but induces angiogenesis in vivo. TGF-beta belongs to a larger superfamily known as the TGF-beta superfamily, which includes activins and bone morphogenetic proteins. TGF-beta is produced as latent high molecular weight complexes from producer cells and is then activated by plasmin or thrombospondin. Latent TGF-beta binding protein (LTBP) is a component of the latent TGF-beta complex produced from platelets and many other cell types; LTBP plays an important role for the interaction of the latent TGF-beta complex with extracellular matrix components. TGF-beta binds several cell surface receptors, including type III receptor (betaglycan), endoglin, type II receptor and type I receptor. The type III receptor and endoglin are indirectly involved in the signal transduction. The Type II and type I receptors have intracellular serine/threonine kinase domains. They form a heteromeric complex after ligand binding and are most important for signal transduction; the type II receptor transactivates the type I receptor, which transduces various signals.
Insights
Transforming growth factor-beta (TGF-beta) proteins regulate cell growth and extracellular matrix deposition. They interact with cell surface receptors to initiate signaling pathways, influencing processes like angiogenesis.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Context:
- Transforming growth factor-beta (TGF-beta) is a key regulator of cellular processes.
- It is part of the larger TGF-beta superfamily, including activins and bone morphogenetic proteins.
- TGF-beta is secreted as a latent complex requiring activation.
Purpose:
- To elucidate the multifaceted roles of TGF-beta in cellular functions.
- To describe the activation mechanisms of latent TGF-beta.
- To detail the TGF-beta receptor signaling pathway.
Summary:
- TGF-beta proteins inhibit cell growth but promote extracellular matrix deposition.
- They exhibit context-dependent effects, inhibiting endothelial cell functions in vitro while promoting angiogenesis in vivo.
- Latent TGF-beta binding protein (LTBP) facilitates the interaction of latent TGF-beta with the extracellular matrix.
- TGF-beta signals through a heteromeric complex of Type I and Type II serine/threonine kinase receptors, with indirect involvement of Type III receptors and endoglin.
Impact:
- Understanding TGF-beta signaling is crucial for various biological processes.
- This knowledge aids in developing therapeutic strategies for diseases involving cell growth, migration, and matrix remodeling.
- Elucidating the TGF-beta pathway provides insights into developmental biology and disease pathogenesis.