Mechanical Mapping of Spheroids Using Brillouin Spectroscopy

Area of Science:

• Biophysics
• Biomaterials Science
• Optical Spectroscopy

Background:

• Brillouin spectroscopy is an emerging technique for non-destructive, contact-free analysis of viscoelastic and architectural properties.
• It measures mechanical properties of 3D samples by analyzing light interaction with acoustic waves.
• Potential applications include in vivo biophysics assessment and disease pathology diagnosis.

Purpose of the Study:

• To apply Brillouin micro-spectroscopy for investigating the biomechanics of living spheroids.
• To detail a protocol for sample preparation, spectral measurements, and data analysis.
• To demonstrate the technique's capability in a 3D microenvironment mimicking in vivo conditions.

Main Methods:

• Utilized Brillouin micro-spectroscopy to probe mechanical properties of 3D cellular spheroids.
• Embedded spheroids within a 3D hydrogel matrix to simulate in vivo cellular microenvironments.
• Performed sequential fluorescence imaging alongside Brillouin spectral measurements.

Main Results:

• Successfully applied Brillouin micro-spectroscopy to living spheroids in a 3D hydrogel matrix.
• Acquired spectral data reflecting the biomechanical properties of the spheroid-hydrogel system.
• Demonstrated the technique's ability to assess microscale mechanics within a 3D biological construct.

Conclusions:

• Brillouin micro-spectroscopy is a powerful tool for studying the biomechanics of 3D cell cultures.
• The method provides insights into cell-matrix interactions within a physiologically relevant 3D environment.
• This technique holds promise for advancing biophysical studies and diagnostics in biomedical science.