Measure and characterization of the forces exerted by growing multicellular spheroids using microdevice arrays

Area of Science:

• Biophysics
• Cancer Research
• Biotechnology

Background:

• Multicellular spheroids mimic microtumors, making them valuable for biomechanical studies.
• Understanding forces in growing spheroids is crucial for cancer research.

Purpose of the Study:

• To develop and validate a novel method for measuring forces exerted by proliferating multicellular spheroids.
• To characterize the magnitude and influencing factors of these forces.

Main Methods:

• Utilized high aspect ratio polydimethylsiloxane (PDMS) pillars as force sensors supporting a breast tumor cell spheroid.
• Employed optical imaging and 3D reconstruction of pillar deformation.
• Applied the finite element method (FEM) to calculate forces based on pillar shape changes.

Main Results:

• Quantified forces exerted by growing spheroids between 100 nN and 300 nN.
• Demonstrated that the exerted force is dependent on the stiffness of the PDMS pillars.
• Observed an increase in force over time correlating with spheroid growth.

Conclusions:

• The developed method allows for accurate measurement and characterization of forces from growing spheroids.
• Spheroid-exerted forces are significant and influenced by material properties and growth dynamics.
• This technique offers new insights into the biomechanics of tumor growth.