Pyrazole-based lamellarin O analogues: synthesis, biological evaluation and structure-activity relationships

Area of Science:

• Medicinal Chemistry
• Organic Synthesis
• Cancer Biology

Background:

• Lamellarin O analogues are known for their biological activities.
• Pyrazole scaffolds are prevalent in pharmacologically active compounds.
• Colorectal cancer remains a significant global health challenge requiring novel therapeutic agents.

Purpose of the Study:

• To synthesize a library of pyrazole-based lamellarin O analogues.
• To evaluate the in vitro cytotoxicity of these analogues against human colorectal cancer cell lines.
• To investigate the mechanism of action of the most potent compounds.

Main Methods:

• Synthesis of pyrazole derivatives via bromination, N-alkylation, and Suzuki cross-coupling reactions.
• In vitro cytotoxicity assays using HCT116, HT29, and SW480 colorectal cancer cell lines.
• Cell cycle analysis using fluorescence-activated cell sorting and viability staining (Calcein AM/Hoechst/PI).

Main Results:

• A library of pyrazole-based lamellarin O analogues was successfully synthesized.
• Several compounds exhibited significant in vitro cytotoxicity against colorectal cancer cell lines, inhibiting proliferation in the low micromolar range.
• The most active compounds induced cell death via G2/M-phase arrest, indicating a non-necrotic mode of action.

Conclusions:

• Pyrazole-based lamellarin O analogues represent a promising class of compounds for colorectal cancer therapy.
• The observed G2/M-phase arrest suggests a targeted mechanism for inducing cancer cell death.
• Further investigation into these analogues could lead to the development of new anti-colorectal cancer drugs.