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Characterize Disease-related Mutants of RAF Family Kinases by Using a Set of Practical and Feasible Methods
Published on: July 17, 2019
Targeting the Raf-MEK-ERK mitogen-activated protein kinase cascade for the treatment of cancer
1Division of Pharmacotherapy and Experimental Therapeutics, Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7295, USA.
Abstract:
Mitogen-activated protein kinase (MAPK) cascades are key signaling pathways involved in the regulation of normal cell proliferation, survival and differentiation. Aberrant regulation of MAPK cascades contribute to cancer and other human diseases. In particular, the extracellular signal-regulated kinase (ERK) MAPK pathway has been the subject of intense research scrutiny leading to the development of pharmacologic inhibitors for the treatment of cancer. ERK is a downstream component of an evolutionarily conserved signaling module that is activated by the Raf serine/threonine kinases. Raf activates the MAPK/ERK kinase (MEK)1/2 dual-specificity protein kinases, which then activate ERK1/2. The mutational activation of Raf in human cancers supports the important role of this pathway in human oncogenesis. Additionally, the Raf-MEK-ERK pathway is a key downstream effector of the Ras small GTPase, the most frequently mutated oncogene in human cancers. Finally, Ras is a key downstream effector of the epidermal growth factor receptor (EGFR), which is mutationally activated and/or overexpressed in a wide variety of human cancers. ERK activation also promotes upregulated expression of EGFR ligands, promoting an autocrine growth loop critical for tumor growth. Thus, the EGFR-Ras-Raf-MEK-ERK signaling network has been the subject of intense research and pharmaceutical scrutiny to identify novel target-based approaches for cancer treatment. In this review, we summarize the current status of the different approaches and targets that are under evaluation and development for the therapeutic intervention of this key signaling pathway in human disease.
Insights
Mitogen-activated protein kinase (MAPK) cascades, particularly the ERK pathway, are crucial in cell regulation and implicated in cancer. This review details therapeutic strategies targeting the EGFR-Ras-Raf-MEK-ERK signaling network for cancer treatment.
Area of Science:
- Cellular signaling pathways
- Oncogenesis and cancer biology
- Pharmacological interventions
Background:
- Mitogen-activated protein kinase (MAPK) cascades regulate essential cellular functions like proliferation and survival.
- Dysregulation of MAPK pathways, especially the extracellular signal-regulated kinase (ERK) pathway, is linked to cancer development.
- The epidermal growth factor receptor (EGFR)-Ras-Raf-MEK-ERK signaling network is frequently altered in human cancers.
Purpose of the Study:
- To review current therapeutic strategies targeting the EGFR-Ras-Raf-MEK-ERK signaling pathway.
- To summarize ongoing research and development for novel cancer treatments focused on this pathway.
- To highlight the significance of this pathway in human oncogenesis.
Main Methods:
- Review of existing literature on MAPK signaling in cancer.
- Analysis of therapeutic targets within the EGFR-Ras-Raf-MEK-ERK cascade.
- Evaluation of pharmacologic inhibitors and their development status.
Main Results:
- The Raf-MEK-ERK pathway is activated by Raf kinases and is a key effector of Ras.
- Mutations in Raf and Ras, along with EGFR alterations, drive oncogenesis.
- ERK activation promotes EGFR ligand expression, creating a tumor growth loop.
Conclusions:
- The EGFR-Ras-Raf-MEK-ERK pathway represents a critical target for novel cancer therapies.
- Target-based approaches are under intense investigation for therapeutic intervention.
- Understanding this signaling network is vital for developing effective cancer treatments.
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