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Published on: October 27, 2020
The role of TGF-β/SMAD4 signaling in cancer
Ming Zhao1,2, Lopa Mishra3, Chu-Xia Deng1
1Faculty of Health Sciences, University of Macau, Macau SAR, China.
Abstract:
Transforming growth factor β (TGF-β) signaling pathway plays important roles in many biological processes, including cell growth, differentiation, apoptosis, migration, as well as cancer initiation and progression. SMAD4, which serves as the central mediator of TGF-β signaling, is specifically inactivated in over half of pancreatic duct adenocarcinoma, and varying degrees in many other types of cancers. In the past two decades, multiple studies have revealed that SMAD4 loss on its own does not initiate tumor formation, but can promote tumor progression initiated by other genes, such as KRAS activation in pancreatic duct adenocarcinoma and APC inactivation in colorectal cancer. In other cases, such as skin cancer, loss of SMAD4 plays an important initiating role by disrupting DNA damage response and repair mechanisms and enhance genomic instability, suggesting its distinct roles in different types of tumors. This review lists SMAD4 mutations in various types of cancer and summarizes recent advances on SMAD4 with focuses on the function, signaling pathway, and the possibility of SMAD4 as a prognostic indicator.
Insights
SMAD4, a key mediator of transforming growth factor beta (TGF-β) signaling, is frequently altered in cancer. Its loss promotes tumor progression and initiation, with distinct roles across various cancer types.
Area of Science:
- Oncology
- Molecular Biology
- Cell Signaling
Background:
- Transforming growth factor beta (TGF-β) signaling regulates critical cellular processes like growth, differentiation, and apoptosis.
- SMAD4 is the central mediator of TGF-β signaling and is frequently inactivated in various cancers, notably pancreatic duct adenocarcinoma.
Purpose of the Study:
- To review SMAD4 mutations across diverse cancer types.
- To summarize recent advancements concerning SMAD4's function and signaling pathways.
- To explore the potential of SMAD4 as a prognostic indicator in cancer.
Main Methods:
- Literature review of studies on SMAD4 mutations and functions in cancer.
- Analysis of SMAD4's role in different tumor initiation and progression contexts.
- Synthesis of current research on SMAD4 signaling and its clinical implications.
Main Results:
- SMAD4 loss alone does not initiate tumors but promotes progression, often in conjunction with other oncogenic mutations (e.g., KRAS, APC).
- In certain cancers like skin cancer, SMAD4 loss initiates tumorigenesis by impairing DNA damage response and increasing genomic instability.
- SMAD4 exhibits context-dependent roles in cancer development, acting as either a tumor suppressor or a promoter.
Conclusions:
- SMAD4 plays multifaceted roles in cancer, influencing both initiation and progression depending on the cellular context and genetic background.
- Understanding SMAD4's distinct functions is crucial for developing targeted cancer therapies.
- SMAD4 alterations represent a significant area for further research, particularly regarding its prognostic value.
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