Synthesis and Optimization of New 3,6-Disubstitutedindole Derivatives and Their Evaluation as Anticancer Agents...

Area of Science:

• Medicinal Chemistry
• Cancer Biology
• Molecular Pharmacology

Background:

• The p53 tumor suppressor protein plays a critical role in cellular response to DNA damage.
• Dysregulation or loss of p53 function is common in many human cancers.
• Targeting the p53 pathway, particularly its regulators like MDM2 and MDM4, is a promising anti-cancer strategy.

Purpose of the Study:

• To synthesize and evaluate novel 3-substituted-6-chloroindole derivatives as potential anti-cancer agents.
• To investigate the compounds' effects on cancer cell growth, focusing on p53 status.
• To determine the compounds' ability to modulate p53 activity through nuclear translocation and interaction with MDM2/MDM4.

Main Methods:

• Synthesis of twelve 3-substituted-6-chloroindole derivatives.
• In vitro testing of growth inhibitory effects on various cancer cell lines (colorectal, lung) and mouse embryonic fibroblasts (MEF) with differing p53 statuses (p53(+/+) and p53(-/-)).
• Assessment of p53 nuclear translocation and binding affinity to murine double minute 2 (MDM2) and murine double minute 4 (MDM4).

Main Results:

• Compound 5a exhibited the most potent growth inhibitory activity against cancer cells.
• Compound 5a displayed selectivity towards p53(+/+) cell lines over p53(-/-) counterparts.
• Compound 5a showed stronger binding to MDM4 compared to MDM2, and its activity profile closely resembled that of Nutlin-3.

Conclusions:

• 3-substituted-6-chloroindole derivatives represent a promising class of anti-cancer compounds.
• Compound 5a is a potent and selective inhibitor of cancer cell growth, particularly in p53 wild-type contexts.
• The mechanism of action for compound 5a involves MDM4 interaction, suggesting a novel therapeutic approach for p53-proficient cancers.