Multiscale structural-rheological mapping of cancer spheroids during maturation

Area of Science:

• Biophysics
• Cancer Biology
• Materials Science

Background:

• Mechanical properties are crucial for solid tumor biology, progression, and treatment response.
• Characterizing the mechanics of 3D in vitro tumor models like cancer spheroids is incomplete.
• Existing methods often miss spatially varying and multiscale features, hindering understanding of structure-mechanics relationships.

Purpose of the Study:

• To comprehensively characterize the mechanical properties of cancer spheroids.
• To investigate the evolution of mechanical behavior at single-cell and multicellular levels.
• To establish a framework linking spheroid structure and rheology.

Main Methods:

• Utilized atomic force microscopy and hydraulic force spectroscopy.
• Performed multiscale microrheology on cancer spheroids.
• Analyzed mechanical evolution over time at different cellular scales.

Main Results:

• Identified a characteristic power-law behavior in spheroid mechanics.
• Quantified contributions of intra- and inter-cellular mechanics to overall rheology.
• Correlated mechanical parameters with structural organization and its temporal changes.

Conclusions:

• Developed a structure-rheology framework for understanding spheroid maturation.
• Provided a mechanistic view of how mechanical properties relate to tumor structure.
• Established a platform for future research in tumor mechanobiology and therapeutic strategies.