Imaging the cellular response to transient shear stress using stroboscopic digital holography

Area of Science:

• Biophysics
• Cell Biology
• Microscopy

Background:

• Investigating cellular responses to mechanical stress is crucial for understanding tissue damage and developing targeted therapies.
• Laser-induced cavitation offers a precise method to induce localized stress on individual cells.

Discussion:

• Stroboscopic quantitative phase microscopy reveals dynamic cellular deformation during cavitation bubble expansion and collapse.
• Microsecond-scale observations show transient cytoplasmic displacement without permanent cell shape changes.
• Longer-term (second-scale) responses include cell edge retraction, rounding, and potential dry mass loss due to shear stress.

Key Insights:

• Laser-induced nanoparticle breakdown generates localized cavitation, enabling single-cell mechanical stress studies.
• Cells exhibit distinct responses to cavitation and shear stress, differing in timescale and outcome.
• The study provides novel insights into plasma membrane permeabilization mechanisms induced by cavitation shear stress.

Outlook:

• Further research can explore varying nanoparticle properties and laser parameters to modulate cavitation effects.
• This technique could be applied to study mechanobiology in different cell types and disease models.
• Understanding these cellular responses may inform strategies for non-invasive therapeutic interventions.