Summary
Published in International Journal of Molecular Sciences (2022), this peer-reviewed study used 3D Petri Dish® micro-molds to form scaffold-free 3D microtissues. Full citation: Nishi, Ryota, et al. Effect of Compressive Stress in Tumor Microenvironment on Malignant Tumor Spheroid Invasion Process
Effect of Compressive Stress in Tumor Microenvironment on Malignant Tumor Spheroid Invasion Process
Research Overview
Mechanical forces, not just biochemistry, can shift cancer cells toward migration and metastasis. This study built an in vitro model of the mechanical tumor microenvironment to test whether solid stress from surrounding tissue can convert tumor cells from noninvasive to invasive phenotypes.
Colorectal cancer spheroids were embedded in agarose gels of varying concentration to simulate the earliest stages of tumor formation and invasion. Spheroids in higher-concentration gels showed peculiar growth after 72 hours of culture, and applying external compressive loading produced the same peculiar growth even in lower-concentration gels — pointing to compression itself as a trigger.
Key Discoveries
- Colorectal spheroids embedded in agarose of varying stiffness to model solid stress
- Higher gel concentration produced abnormal growth patterns after 72 h
- External compressive loading reproduced the effect in softer gels, implicating compression directly
