Inhibition of human copper trafficking by a small molecule significantly attenuates cancer cell proliferation

Area of Science:

• Biochemistry
• Molecular Biology
• Cancer Research

Background:

• Copper is essential for life, playing critical roles in cellular processes.
• Dysregulation of copper homeostasis is implicated in various diseases, including cancer.
• Targeting copper trafficking presents a potential strategy for therapeutic intervention.

Purpose of the Study:

• To identify and characterize small molecules that inhibit human copper-trafficking proteins Atox1 and CCS.
• To investigate the effects of inhibiting copper transport on cancer cell proliferation and tumor growth.
• To elucidate the molecular mechanisms underlying copper-trafficking inhibition in cancer cells.

Main Methods:

• Development and application of small molecules targeting Atox1 and CCS.
• Cell proliferation assays using cancer and normal cell lines.
• In vivo tumor growth studies in mouse models.
• Analysis of cellular oxidative stress and ATP levels.
• Investigation of AMP-activated protein kinase (AMPK) and lipogenesis pathways.

Main Results:

• Inhibition of Atox1 and CCS significantly reduced cancer cell proliferation and tumor growth in mice.
• Normal cell proliferation was unaffected by the inhibition of these copper-trafficking proteins.
• Blocking copper transport induced cellular oxidative stress and depleted ATP levels.
• Reduced ATP activated AMPK, leading to decreased lipogenesis, contributing to anti-cancer effects.

Conclusions:

• Copper chaperones Atox1 and CCS are viable targets for selective anticancer therapies.
• Disrupting cellular copper transport offers a novel approach to combat cancer.
• The identified small molecules provide a selective method to inhibit cancer cell growth by targeting copper homeostasis.