Brillouin microscopy monitors rapid responses in subcellular compartments.

Area of Science:

• Cellular and Molecular Biomechanics
• Biophysics
• Spectroscopy

Background:

• Cell mechanical properties are vital for understanding disease mechanisms and fundamental biological processes like energy and force transduction.
• Brillouin microscopy offers a non-contact, label-free method for assessing cell viscoelasticity at the sub-cellular level.
• Previous studies validated Brillouin spectroscopy for static cell measurements, but fast, dynamic sub-cellular analysis remained unexplored.

Purpose of the Study:

• To pioneer the measurement of rapid, sub-second viscoelastic responses within distinct subcellular compartments.
• To investigate the cytomechanical changes in cytoplasm, nucleoplasm, and nucleoli following a short electrical impulse.
• To demonstrate the capability of Brillouin spectroscopy for real-time biomechanical monitoring within cells.

Main Methods:

• Utilized a custom multimodal spectroscopy system for high-speed measurements.
• Applied a short-duration electrical impulse as a stimulus to biological cells.
• Monitored and analyzed the viscoelastic response of cytoplasm, nucleoplasm, and nucleoli using Brillouin spectroscopy.

Main Results:

• Successfully measured the rapid viscoelastic response of subcellular structures to an electrical stimulus for the first time.
• Observed distinct mechanical changes in cytoplasm, nucleoplasm, and nucleoli, despite a uniform stimulus.
• Demonstrated the ability of Brillouin spectroscopy to capture real-time, dynamic biomechanical alterations within different cellular compartments.

Conclusions:

• Brillouin spectroscopy is capable of measuring rapid, real-time biomechanical changes within distinct subcellular compartments.
• The study highlights the potential of Brillouin spectroscopy to significantly advance cellular biomechanics research.
• Distinct subcellular structures exhibit unique mechanical responses to identical stimuli, offering new insights into cellular function.