Carotenoid Lutein Selectively Inhibits Breast Cancer Cell Growth and Potentiates the Effect of Chemotherapeutic...

Area of Science:

• Oncology
• Nutritional Science
• Cell Biology

Background:

• Dietary carotenoids are investigated for their potential role in reducing breast cancer risk.
• The anti-cancer effects of carotenoids, including lutein, require further investigation due to controversial findings.

Purpose of the Study:

• To investigate the specific effects of carotenoids, particularly lutein, on breast cancer cell lines.
• To elucidate the mechanisms underlying lutein's anti-cancer activity and its potential therapeutic applications.

Main Methods:

• Testing several carotenoids (β-carotene, lutein, astaxanthin) on various breast cancer cell lines and primary mammary epithelial cells (PmECs).
• Assessing lutein's effects in combination with taxanes (paclitaxel, docetaxel).
• Analyzing intracellular reactive oxygen species (ROS) production, p53 signaling pathway activation, and HSP60 levels.

Main Results:

• Lutein significantly inhibited breast cancer cell growth, inducing cell-cycle arrest and caspase-independent cell death, with minimal impact on normal PmECs.
• Lutein's growth inhibition was comparable to taxanes, and combined treatment showed additive effects.
• Lutein increased ROS production in triple-negative breast cancer (TNBC) cells, an effect attenuated by N-acetyl cysteine, suggesting a role for ROS.
• Lutein activated the p53 signaling pathway and increased HSP60 levels in TNBC cells.

Conclusions:

• Lutein effectively inhibits breast cancer cell growth via cell type-specific ROS generation and modulation of signaling pathways like p53 and HSP60.
• Lutein demonstrates potential as an alternative or adjunct therapeutic strategy for breast cancer, particularly TNBC.
• Dietary lutein supplementation may offer a promising approach for breast cancer prevention and treatment.