A 3D model to evaluate cell chemotaxis within a heterogenic tumor microenvironment

Area of Science:

• Oncology
• Cell Biology
• Biomaterials Science

Background:

• The tumor microenvironment (TME) is complex and heterogeneous, influencing tumor progression and invasion.
• Understanding cellular interactions within the TME is crucial for developing new cancer therapies.
• Current models often fail to fully recapitulate the in vivo TME dynamics.

Purpose of the Study:

• To present a novel, tailorable 4-well 3D culture chamber for studying chemotaxis.
• To investigate the migration of distinct stromal cell types towards melanoma cells in a 3D collagen matrix.
• To assess the potential of this system for modeling cancer cell recruitment and invasion.

Main Methods:

• Development of a 4-well 3D culture chamber utilizing type I collagen hydrogel as a substrate.
• Differential molecule diffusion based on molecular weight was characterized within the hydrogel.
• Co-culture of VMM15 melanoma cells (central well) with human adipose stem cells (hASCs), human dermal microvascular endothelial cells (hDMECs), and human dermal fibroblasts (hDFbs) (outer wells).

Main Results:

• Stromal cells (hASCs and hDFbs) exhibited directional migration towards VMM15 melanoma cells within the 3D collagen matrix.
• Human dermal fibroblasts (hDFbs) showed a significantly larger migration area compared to hASCs.
• The system demonstrated differential molecule diffusion, correlating with molecular weight.

Conclusions:

• The novel 3D culture system effectively models chemotaxis and cell recruitment in the TME.
• This platform can be used to study the impact of stromal cell support on melanoma cell invasion.
• Further research using this system can elucidate mechanisms of tumor progression and inform therapeutic strategies.