ACSL4 and polyunsaturated lipids support metastatic extravasation and colonization.

Area of Science:

• Oncology
• Cell Biology
• Metabolic Pathways

Background:

• Metastatic cancer cells require significant adaptability.
• The role of the cellular lipidome in metastasis is not well understood.
• Ferroptosis susceptibility correlates with metastatic potential.

Purpose of the Study:

• To investigate the link between the cellular lipidome and cancer metastasis.
• To identify key enzymes involved in lipid metabolism that promote metastasis.
• To explore therapeutic strategies targeting lipid metabolism for cancer treatment.

Main Methods:

• Analysis of lipid content and ferroptosis sensitivity in primary and metastatic cancer cells from ovarian cancer patients.
• Metabolism-focused CRISPR screens in a mouse model of ovarian cancer metastasis.
• In vivo selection and co-inhibition studies of key enzymes.

Main Results:

• Metastases-derived cells show higher ferroptosis sensitivity and polyunsaturated fatty acyl (PUFA)-lipid content.
• Acyl-coenzyme A (CoA) synthetase long-chain family member 4 (ACSL4) is identified as a pro-metastasis factor.
• ACSL4 enhances membrane fluidity and invasiveness, promoting extravasation.
• High PUFA-lipid levels create dependencies on enzymes like ABHD6, ECI1, and ECH1 for unsaturated fatty acid (UFA) preparation for beta-oxidation.
• Co-inhibition of ACSL4 and ECH1 significantly suppressed metastasis.

Conclusions:

• PUFA-lipids play a dual role in tumor progression and metastasis.
• ACSL4 promotes metastasis by increasing membrane fluidity and invasiveness.
• Targeting ACSL4 and downstream metabolic enzymes like ECH1 offers a potential therapeutic strategy for suppressing cancer metastasis.