Modeling Tenascin-C-rich metastatic tumor niches in engineered hydrogel biomaterials

Area of Science:

• Biomaterials Science
• Cancer Biology
• Extracellular Matrix Research

Background:

• The extracellular matrix (ECM) significantly influences tumor progression, but traditional 2D cultures and in vivo models have limitations in studying these interactions.
• Ewing sarcoma (EwS) is an aggressive cancer that frequently metastasizes to the lung, necessitating better models to understand tumor-ECM dynamics in this context.

Purpose of the Study:

• To develop a synthetic, tunable 3D hydrogel system that accurately mimics the soft tissue tumor microenvironment (TME) for mechanistic studies of ECM-tumor interactions.
• To investigate the impact of specific ECM components, like tenascin-C (TNC), on EwS cell behavior and phenotype within a controlled 3D matrix.
• To create a platform enabling non-perturbative recovery of encapsulated cells for downstream functional assays.

Main Methods:

• Fabrication of a tunable 3D poly(ethylene glycol) (PEG) hydrogel functionalized with integrin-binding peptides from collagen I and fibronectin.
• Incorporation of a tenascin-C (TNC)-derived peptide to model metastatic ECM and modulate hydrogel properties.
• Encapsulation of EwS cells within the hydrogel to study matrix-dependent growth and phenotypic changes.
• Utilizing sortase-degradable crosslinkers for efficient and non-disruptive retrieval of encapsulated cells.

Main Results:

• The 3D hydrogel successfully recapitulated aspects of the soft tissue TME, showing matrix-dependent growth and phenotypic variation in EwS cells.
• The incorporated TNC peptide significantly influenced divergent tumor behaviors and induced cell state changes comparable to native TNC.
• The sortase-mediated degradation allowed for effective cell retrieval, preserving cell viability for subsequent analyses.

Conclusions:

• The developed tunable 3D hydrogel provides a reductionist, reproducible biomaterials-based framework for dissecting complex tumor-ECM interactions.
• This platform addresses challenges in PEG hydrogel degradation and cell retrieval, offering a powerful tool to study EwS metastasis to the lung.
• The study establishes a novel approach to investigate cancer cell behavior in a controlled microenvironment, potentially identifying new therapeutic targets.