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Updated: Apr 23, 2026

Characterize Disease-related Mutants of RAF Family Kinases by Using a Set of Practical and Feasible Methods
Published on: July 17, 2019
Molecular pathways: targeting RAC-p21-activated serine-threonine kinase signaling in RAS-driven cancers
Nicole M Baker1, Hoi Yee Chow2, Jonathan Chernoff2
1Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina. Lineberger Comprehensive Cancer Center, Chapel Hill, North Carolina.
Abstract:
Cancers driven by oncogenic Ras proteins encompass some of the most deadly human cancer types, and there is a pressing need to develop therapies for these diseases. Although recent studies suggest that mutant Ras proteins may yet be druggable, the most promising and advanced efforts involve inhibitors of Ras effector signaling. Most efforts to target Ras signaling have been aimed at the ERK mitogen-activated protein kinase and the phosphoinositide 3-kinase signaling networks. However, to date, no inhibitors of these Ras effector pathways have been effective against RAS-mutant cancers. This ineffectiveness is due, in part, to the involvement of additional effectors in Ras-dependent cancer growth, such as the Rac small GTPase and the p21-activated serine-threonine kinases (PAK). PAK proteins are involved in many survival, cell motility, and proliferative pathways in the cell and may present a viable new target in Ras-driven cancers. In this review, we address the role and therapeutic potential of Rac and group I PAK proteins in driving mutant Ras cancers.
Insights
Targeting Ras-driven cancers requires new approaches. This review explores the therapeutic potential of Rac and p21-activated kinases (PAK) as novel targets in these deadly diseases.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Ras-driven cancers are a leading cause of cancer mortality, necessitating novel therapeutic strategies.
- Current therapies targeting Ras effector pathways like ERK and PI3K have shown limited efficacy in RAS-mutant cancers.
- This limitation is partly due to the involvement of alternative effectors, including Rac and p21-activated kinases (PAK), in cancer progression.
Purpose of the Study:
- To review the role of Rac and group I PAK proteins in the development and progression of Ras-driven cancers.
- To evaluate the therapeutic potential of targeting Rac and PAK pathways as a novel strategy for treating these cancers.
Main Methods:
- Literature review of studies investigating Ras signaling pathways.
- Analysis of the involvement of Rac and PAK proteins in cancer cell survival, motility, and proliferation.
- Examination of existing and potential therapeutic interventions targeting Rac and PAK.
Main Results:
- Mutant Ras proteins drive cancer through various effector pathways, including Rac and PAK.
- PAK proteins are implicated in critical cellular processes that promote cancer growth.
- Targeting Rac and PAK may offer a promising therapeutic avenue for Ras-mutant cancers.
Conclusions:
- Rac and group I PAK proteins represent viable and underexplored therapeutic targets in Ras-driven cancers.
- Further research into the specific roles and inhibition of these pathways is warranted.
- Developing inhibitors for Rac and PAK could lead to more effective treatments for deadly Ras-mutant cancers.
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