Laser-Induced Shockwave (LIS) to Study Neuronal Ca²⁺ Responses

Area of Science:

• Neuroscience
• Biophysics
• Cell Biology

Background:

• Blast-induced traumatic brain injury (TBI) involves complex cellular responses.
• Laser-induced shockwaves (LIS) offer a controlled method to simulate TBI conditions.
• Genetically encoded biosensors enable real-time monitoring of molecular events during injury.

Purpose of the Study:

• To investigate the immediate calcium ion (Ca2+) response in cortical neurons and Schwann cells subjected to LIS.
• To assess the utility of the D3CPV Ca2+ FRET biosensor in studying cellular responses to mechanical stress.
• To correlate LIS-induced cellular responses with simulated TBI conditions.

Main Methods:

• Utilized laser-induced shockwaves (LIS) to apply mechanical stress to cells.
• Employed the genetically encoded Ca2+ FRET biosensor D3CPV for real-time Ca2+ monitoring.
• Examined Ca2+ transients in cortical neurons and Schwann cells under varying extracellular Ca2+ conditions.

Main Results:

• Both cortical neurons and Schwann cells exhibited a transient increase in intracellular Ca2+ upon LIS exposure.
• This Ca2+ response occurred independently of extracellular Ca2+ availability.
• LIS facilitated simultaneous observation of shear stress effects, cell damage, and cell death.

Conclusions:

• LIS is a viable tool for studying the immediate cellular Ca2+ dynamics following TBI-like mechanical insults.
• The D3CPV biosensor effectively captures rapid Ca2+ signaling events in response to LIS.
• LIS enables comprehensive monitoring of cellular responses, including stress, damage, and death, in a controlled experimental setting.