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Secreted WNT antagonists as tumor suppressors: pro and con
Jeffrey S Rubin1, Michal Barshishat-Kupper, Farhana Feroze-Merzoug
1Laboratory of Cellular and Molecular Biology, National Cancer Institute, Bethesda, MD 20892, USA. rubinj@mail.nih.gov
Abstract:
Dysregulation of Wnt signaling is common in a variety of human malignancies. Activation of the canonical Wnt or beta-catenin pathway has been especially well documented in cancer, although other non-canonical Wnt signaling pathways also have been implicated in neoplasia. In most instances, constitutive signaling through the beta-catenin pathway involves activation of effector molecules or loss of tumor suppressor function downstream of Wnt binding to its cell surface receptors. Nonetheless, in recent years increasing evidence suggests that secreted Wnt antagonists act as tumor suppressors, with their expression often silenced by promoter hypermethylation. This implies that maximal constitutive signaling in cancer requires unimpaired Wnt stimulation at the cell surface as well as enhanced signal propagation within the cell. However, an understanding of the role secreted Wnt antagonists may play in cancer is complicated by the multiplicity of these proteins, their potential Wnt-independent activities and observations indicating that sometimes they may promote tumor growth. Just as the particular function of Wnt signaling in development and homeostasis varies with the setting, the impact of secreted Wnt antagonists on neoplasia depends on the molecular, cellular and tissue context.
Insights
Wnt signaling dysregulation drives cancer. While Wnt/beta-catenin activation is known, secreted Wnt antagonists also function as tumor suppressors, though their role in cancer is complex and context-dependent.
Area of Science:
- Oncology
- Molecular Biology
- Cell Signaling
Background:
- Dysregulation of Wnt signaling pathways is a hallmark of many human cancers.
- The canonical Wnt/beta-catenin pathway's activation is well-documented in neoplasia.
- Non-canonical Wnt pathways are also implicated in cancer development.
Purpose of the Study:
- To explore the complex role of secreted Wnt antagonists in cancer.
- To understand how Wnt antagonists function as tumor suppressors or promoters.
- To investigate the context-dependent impact of Wnt antagonists on neoplasia.
Main Methods:
- Review of existing literature on Wnt signaling and cancer.
- Analysis of studies investigating secreted Wnt antagonists.
- Examination of Wnt-independent activities and context-specific effects.
Main Results:
- Constitutive Wnt/beta-catenin signaling often results from downstream events or loss of tumor suppressors.
- Emerging evidence indicates secreted Wnt antagonists can act as tumor suppressors, with expression silenced by promoter hypermethylation.
- The role of Wnt antagonists in cancer is multifaceted, influenced by their multiplicity, Wnt-independent activities, and context-dependent tumor-promoting or suppressing effects.
Conclusions:
- Maximal Wnt signaling in cancer may require both cell surface stimulation and intracellular signal propagation.
- Understanding the precise role of secreted Wnt antagonists in cancer requires consideration of molecular, cellular, and tissue contexts.
- The dual role of Wnt antagonists as potential tumor suppressors or promoters highlights the complexity of Wnt pathway involvement in neoplasia.
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