Laser-beam-triggered microcavitation: a novel method for selective cell destruction

Area of Science:

• Biomedical Engineering
• Cell Biology
• Photodynamic Therapy

Background:

• Developing targeted cell destruction methods is crucial for effective antitumor therapies.
• Existing methods may lack selectivity or cause undesirable side effects.

Purpose of the Study:

• To introduce and evaluate a new cell destruction method utilizing microcavitation for potential therapeutic applications.
• To assess the efficiency, selectivity, and potential delayed effects of microcavitation-induced cell death.

Main Methods:

• Cells were loaded with microparticles (<1 micrometer) via phagocytosis.
• Irradiation with short laser pulses induced localized microcavitation around microparticles.
• Bovine aortic endothelial cell cultures were used to test the method's efficacy and selectivity.

Main Results:

• Microcavitation demonstrated efficient, rapid, and selective cell killing, dependent on microparticle load, laser pulses, and fluence.
• Cell death was restricted to microparticle-containing cells, leaving others unaffected.
• Lysosomal hydrolases contributed to cell death, inducing apoptosis independently of caspases; no delayed effects were observed in surviving cells.

Conclusions:

• Microcavitation is a highly selective and rapid cell-killing method targeting only cells with microparticles.
• The technique shows promise for antitumor therapy due to its specificity and lack of delayed adverse effects.