Disaccharides obtained from carrageenans as potential antitumor agents

Area of Science:

• Marine Biotechnology
• Natural Products Chemistry
• Cancer Research

Background:

• Carrageenans, sulfated galactans from red seaweeds, possess known biological activities.
• Investigating carrageenan derivatives for potential antitumor applications is an active area of research.

Purpose of the Study:

• To prepare and evaluate purified native and degraded carrageenans (κ-, ι-, λ-), including disaccharides (carrabioses) and disaccharide-alditols (carrabiitols), for antitumor properties.
• To identify the specific active components responsible for cytotoxic and antitumor effects.

Main Methods:

• Extraction and purification of native and degraded κ-, ι-, and λ-carrageenans.
• Preparation of carrageenan oligosaccharides, disaccharides (carrabioses), and disaccharide-alditols (carrabiitols).
• In vitro cytotoxic assays on LM2 tumor cells, including apoptosis pathway analysis and assessment of metastatic ability, cell-cell, and cell-matrix interactions.

Main Results:

• Both κ- and ι-carrageenan, along with carrageenan oligosaccharides, demonstrated cytotoxicity against LM2 tumor cells.
• Among tested disaccharides (carrabioses) and carrabiitols, only carrabioses exhibited cytotoxicity.
• κ-carrabiose was the most potent cytotoxic agent, inducing apoptosis and reducing the metastatic potential and cellular interactions of surviving LM2 cells.
• Lower molecular weight and sulfate content correlated with increased cytotoxic activity.

Conclusions:

• Carrageenan-derived disaccharides, especially κ-carrabiose, exhibit significant cytotoxic and antimetastatic properties, suggesting potential as antitumor compounds.
• Carrageenan oligosaccharides and ι-carrageenan may serve as adjuvants or carriers in anticancer therapies.
• Future applications include coupling carrabiose units with antineoplastics to enhance efficacy.