A three-dimensional engineered heterogeneous tumor model for assessing cellular environment and response.

Area of Science:

• Biotechnology
• Cell Biology
• Biomedical Engineering

Background:

• Hypoxic gradients are critical in cellular processes, influencing cell behavior and disease progression.
• Existing 3D cell culture models often lack the ability to precisely mimic or analyze these gradients.
• Understanding cellular responses in hypoxic environments is crucial for developing new therapies.

Purpose of the Study:

• To describe the development and implementation of the TRACER (tissue roll for analysis of cellular environment and response) system.
• To enable the analysis of cellular behavior and phenotype within controlled hypoxic gradients.
• To provide a versatile platform for various cellular and molecular analyses.

Main Methods:

• Fabrication of a single-piece cellulose scaffold for cell encapsulation in hydrogel.
• Assembly of the scaffold into layered 3D tissue constructs around an oxygen-impermeable mandrel.
• Layer-by-layer analysis of cell viability, proliferation, and oxygen gradients using microscopy and flow cytometry.
• Isolation of cells for downstream applications like clonogenic assays and molecular analysis.

Main Results:

• Successful construction of 3D tissue constructs with cell-defined oxygen gradients.
• Demonstrated ability to quantify cell populations and oxygen levels layer-by-layer.
• Validated methods for isolating viable cells and extracting biomolecules from different layers.
• TRACER facilitates rapid disassembly for diverse analytical purposes.

Conclusions:

• The TRACER system offers a novel and efficient method for studying cellular responses in hypoxic environments.
• This platform provides a unique tool for researchers with basic tissue culture experience.
• TRACER enables detailed investigation of cellular behavior, phenotype, and molecular changes in 3D, mimicking in vivo conditions.