A novel tissue engineered three-dimensional in vitro colorectal cancer model

Area of Science:

• Biomedical Engineering
• Cancer Biology
• In Vitro Modeling

Background:

• Tumor microenvironment interactions, including stroma and vasculature, are crucial for cancer growth and progression.
• Understanding these complex interactions requires advanced in vitro models that mimic in vivo conditions.

Purpose of the Study:

• To develop a novel three-dimensional (3-D) in vitro biomimetic model of colorectal cancer.
• To utilize colorectal cancer cells and connective tissue cells to create a more realistic tumor microenvironment.

Main Methods:

• A 3-D model was constructed using HT29 colorectal cancer cells within a dense collagen type I matrix, co-cultured with fibroblasts and/or endothelial cells in a less dense collagen gel.
• Partial plastic compression was used to create the dense cancer mass.
• Real-time oxygen probes were employed to measure oxygen levels and assess hypoxic conditions.

Main Results:

• HT29 cells in the 3-D model exhibited slower proliferation compared to 2-D cultures.
• Tumor spheroids formed and invaded the surrounding matrix, moving away from hypoxic core regions.
• Vascular Endothelial Growth Factor (VEGF) was released by HT29 cells, primarily at the invasive edge of the artificial cancer mass.

Conclusions:

• The developed 3-D model provides a reproducible and complex in vitro system for studying colorectal cancer.
• This biomimetic model can advance the understanding of cancer cell-stroma interactions and tumor progression.
• The model serves as a valuable platform for facilitating therapeutic drug testing in a more physiologically relevant context.