Sphaerococcus coronopifolius bromoterpenes as potential cancer stem cell-targeting agents

Area of Science:

• Marine natural products
• Medicinal chemistry
• Cancer biology

Background:

• Cancer stem cells (CSCs) contribute to lung cancer chemoresistance.
• Tumor-associated stromal cells influence tumor growth and metastasis.
• There is an urgent need for novel anticancer drug development.

Purpose of the Study:

• To evaluate the antitumor potential of five bromoterpenes from Sphaerococcus coronopifolius.
• To target cancer stem cells (CSCs) in a co-culture model.
• To assess the selective cytotoxicity of bromoterpenes against CSCs.

Main Methods:

• Compounds were isolated from the red alga Sphaerococcus coronopifolius.
• Cytotoxicity was assessed using MTT assays on cell monocultures.
• Selective CSC targeting was evaluated in co-cultures using sphere-forming assays.
• Interleukin-6 (IL-6) levels were measured.

Main Results:

• Bromosphaerol selectively eliminated malignant cells in monocultures.
• 12S- and 12R-hydroxy-bromosphaerol isomers showed cytotoxicity to non-malignant BEAS-2B cells but not to fibroblasts (HBFs).
• 12R-hydroxy-bromosphaerol demonstrated the highest cytotoxicity and CSC-abrogating ability in co-cultures, independent of IL-6.

Conclusions:

• Bromoterpenes show potential for abrogating cancer stem cells (CSCs).
• 12R-hydroxy-bromosphaerol is a promising candidate for further investigation in more complex models.
• This study opens new avenues for developing CSC-targeting lung cancer therapies.