Red blood cell membrane damage by light-induced thermal gradient under optical trap

Area of Science:

• Biophysics
• Optical trapping
• Cell membrane research

Background:

• Optical trapping of red blood cells (RBCs) is a valuable tool in biophysics.
• Understanding laser-induced cell damage mechanisms is crucial for optimizing experimental conditions.

Purpose of the Study:

• To investigate the mechanism of rapid membrane damage in optically trapped RBCs.
• To explore the potential of laser-induced RBC damage for diagnosing type II diabetes.

Main Methods:

• Optically trapping red blood cells (RBCs) using laser powers ≥280 mW.
• Estimating laser-induced thermal gradients across the RBC membrane.
• Comparing damage rates in RBCs from healthy individuals and type II diabetic patients.

Main Results:

• Rapid membrane damage and cell collapse observed at trapping powers ≥280 mW.
• Mechanism identified as temperature gradient-induced electropermeabilization.
• Shock waves from ruptured cells caused permeabilization of nearby cells.
• Noticeably different damage rates observed in RBCs from type II diabetic patients.

Conclusions:

• Laser-induced thermal gradients are responsible for electropermeabilization and damage of optically trapped RBCs.
• The shock waves generated can affect surrounding cells.
• Altered RBC damage rates in type II diabetes suggest a potential for novel optical diagnostic methods.