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Updated: Oct 16, 2025
Identification of Mediators of T-cell Receptor Signaling via the Screening of Chemical Inhibitor Libraries
Published on: January 22, 2019
Design, Synthesis, and Structure-Activity Relationship Optimization of Pyrazolopyrimidine Amide Inhibitors of
Guillaume Mata1, Dillon H Miles1, Samuel L Drew1
1Arcus Biosciences, Inc., 3928 Point Eden Way, Hayward, California 94545, United States.
Researchers developed novel pyrazolopyrimidine isoindolinones that are potent and selective inhibitors of phosphoinositide-3-kinase gamma (PI3Kγ). These compounds show promise for repolarizing the tumor immune microenvironment and enhancing anti-cancer immunity.
Area of Science:
- Medicinal Chemistry
- Immunology
- Oncology
Background:
- Phosphoinositide-3-kinase gamma (PI3Kγ) is crucial in immune cells, driving inflammation and immune suppression in cancer.
- Inhibiting PI3Kγ can alter the tumor immune microenvironment towards an anti-cancer inflammatory state.
Purpose of the Study:
- To discover and optimize potent and selective PI3Kγ inhibitors.
- To develop novel drug candidates for cancer immunotherapy by modulating the tumor immune microenvironment.
Main Methods:
- Structure-based drug design and optimization of pyrazolopyrimidine isoindolinones.
- X-ray crystallography and molecular docking for structural analysis.
- Structure-activity relationship (SAR) studies to refine inhibitor properties.
Main Results:
- Identification of highly potent and isoform-selective PI3Kγ inhibitors with favorable drug-like properties.
- Optimization of amide and isoindolinone substituents for enhanced potency, selectivity, and metabolic stability.
- Compound 56 demonstrated significant pro-inflammatory effects, increasing cytokine gene expression in M1 macrophages.
Conclusions:
- Structure-based optimization led to the discovery of novel PI3Kγ inhibitors.
- These inhibitors hold potential for cancer treatment by enhancing anti-tumor immune responses.
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