Research progress of mTOR inhibitors

Area of Science:

• Biochemistry
• Pharmacology

Background:

• Mammalian target of rapamycin (mTOR) is a key regulator of cell metabolism, growth, and survival, existing as mTORC1 and mTORC2 complexes.
• mTOR inhibitors block this pathway, offering anti-inflammatory, anti-proliferative, and apoptosis-inducing effects, making them vital in cancer therapy.

Purpose of the Study:

• To systematically review and classify mTOR inhibitors based on their chemical structures.
• To analyze the structure-activity relationships (SAR) of different generations of mTOR inhibitors.
• To explore potential new scaffolds for second-generation mTOR inhibitors.

Main Methods:

• Classification of mTOR inhibitors into four categories: first-generation allosteric, second-generation ATP-competitive, second-generation mTOR/PI3K dual, and third-generation inhibitors.
• Detailed analysis of the structures, properties, and clinical research of these inhibitors.
• Examination of natural products with mTOR inhibitory activity.

Main Results:

• The review categorizes mTOR inhibitors by generation and chemical structure, detailing their properties and clinical relevance.
• Structure-activity relationships were analyzed for each generation, identifying key structural features.
• Two hypothetical scaffolds (inverted-Y-shape and C-shape) were proposed for second-generation mTOR inhibitors.

Conclusions:

• Understanding the SAR of mTOR inhibitors is crucial for optimizing their efficacy and selectivity.
• The proposed scaffolds offer potential starting points for designing novel mTOR inhibitors.
• This comprehensive review provides valuable insights for drug design and development in mTOR-targeted therapies.