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3D Microtissues for Injectable Regenerative Therapy and High-throughput Drug Screening
Published on: October 4, 2017
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Engineering patterned tumor microtissues in 3D microwells via stress relaxation-regulated cell-matrix interactions.
Longjie Li1,2, Weiran Qin1, Jing Xie1
1Institute of Biomedical Engineering, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, 610041, Sichuan, China. jingxie@scu.edu.cn.
Journal of Materials Chemistry. B
|September 26, 2025
Summary
Researchers engineered 3D patterned tumor microtissues using controlled microwells. Stress relaxation in microwells dictates microtissue architecture and cell proliferation, impacting tumor progression models.
Area of Science:
- Biomedical Engineering
- Cancer Research
- Materials Science
Background:
- Tumor geometry influences progression, but replicating complex 3D tumor microtissues in vitro is challenging.
- Existing methods like spheroids and scaffolds have limitations in homogeneity and confinement.
- Investigating the link between geometric complexity and tumor development requires advanced modeling.
Purpose of the Study:
- To develop a standardized method for engineering 3D patterned tumor microtissues with controlled geometries.
- To investigate the role of material stress relaxation in microtissue formation and cellular behavior.
- To establish a platform for studying the impact of tumor geometry on progression.
Main Methods:
- Utilized alginate gel-based microwells with precisely controlled geometries and mechanical properties.
- Engineered 3D microtissues by varying microwell stress relaxation rates (slow vs. fast).
- Analyzed microtissue architecture, cell distribution, proliferation, and underlying adhesion mechanisms (cadherin, integrin, actomyosin).
Main Results:
- Slow-relaxing microwells (τ1/2 = 1710 ± 120 s) yielded stable, well-defined microtissues with uniform cells and high proliferation (85% success).
- Fast-relaxing microwells (τ1/2 = 392 ± 35 s) led to structural collapse (81%), reduced proliferation (27%), and altered cell distribution.
- Fast relaxation amplified integrin-dependent actomyosin by 2.9-fold, mediated by stress relaxation impacting cell-cell and cell-matrix adhesion.
Conclusions:
- Stress relaxation is critical in regulating adhesion-driven multicellular organization in 3D tumor models.
- The developed method provides a standardized platform for investigating geometric influences on tumor progression.
- Understanding these geometric-mechanistic relationships is key for advancing cancer research and therapeutic strategies.
