Recent advance in macrocyclic CDK inhibitors
Jiamin Zheng1, Zhisen Zhang1, Jinxin Liu2
1Department of Medicinal Chemistry, Insilico Medicine Shanghai Ltd., Shanghai, China.
Abstract:
Cyclin-dependent kinases (CDKs) are central regulators of the cell cycle progression and transcription, making them attractive targets especially in oncology. The clinical success of CDK4/6 inhibitors in hormone receptor-positive (HR+) and HER2-negative (HER2-) breast cancer has highlighted the therapeutic potential of CDK inhibition, along with ongoing clinical evaluation of other CDK-targeted agents. Despite the progress, challenges still remain due to off-target toxicity and the emergence of resistance. Recently, macrocycle-based drug design has gained recognition for its ability to enhance the kinase inhibitory activities and selectivity, improve drug-like properties, and potentially overcome resistance. This review summarizes recent advances (2015-2025) in macrocyclization strategies for CDK inhibitors, tracing the structural modification process from the acyclic scaffolds and highlighting their potential to address key limitations of current therapies.
Insights
Macrocycles offer a promising strategy to develop novel cyclin-dependent kinase (CDK) inhibitors, potentially overcoming resistance and toxicity issues seen with current cancer therapies.
Area of Science:
- Medicinal Chemistry
- Oncology
- Molecular Biology
Background:
- Cyclin-dependent kinases (CDKs) are crucial regulators of cell cycle and transcription, making them key targets in cancer therapy.
- CDK4/6 inhibitors have shown success in breast cancer, but challenges like resistance and off-target toxicity persist.
- Macrocycle-based drug design is emerging as a strategy to improve kinase inhibitor efficacy and drug-like properties.
Purpose of the Study:
- To review recent advancements in macrocyclization strategies for developing cyclin-dependent kinase (CDK) inhibitors.
- To highlight how macrocyclic scaffolds can address limitations of current CDK-targeted therapies.
- To explore the structural evolution of CDK inhibitors from acyclic to macrocyclic forms.
Main Methods:
- Literature review of scientific publications and clinical trials from 2015-2025.
- Analysis of structural modifications in CDK inhibitor design, focusing on macrocyclization techniques.
- Evaluation of the impact of macrocyclization on kinase inhibitory activity, selectivity, and drug-like properties.
Main Results:
- Macrocyclization strategies have enhanced the potency and selectivity of CDK inhibitors.
- Macrocyclic CDK inhibitors show potential in overcoming acquired resistance mechanisms.
- Improved pharmacokinetic profiles and reduced off-target effects are observed with macrocyclic designs.
Conclusions:
- Macrocyclization represents a powerful approach for designing next-generation CDK inhibitors.
- These novel macrocyclic agents hold significant promise for improving cancer treatment outcomes.
- Further research and clinical evaluation are warranted to fully realize the therapeutic potential of macrocyclic CDK inhibitors.
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