3D-resolved targeting of photodynamic therapy using temporal focusing

Area of Science:

• Biomedical Optics
• Cancer Biology
• Photodynamic Therapy

Background:

• Selective induction of apoptosis in tumor nodules is crucial for effective cancer treatment.
• Current methods often lack cellular-level precision or require long treatment times.
• Overcoming light penetration depth limitations in dense tissues remains a challenge.

Purpose of the Study:

• To present a method for selective apoptosis induction in tumor nodules with high spatial resolution.
• To demonstrate rapid treatment times using specific optical techniques and a photosensitizer.
• To validate the method's efficacy in 3D cell cultures and through tumor tissue.

Main Methods:

• Utilizing 3D-resolved widefield temporal focusing illumination for precise optical targeting.
• Employing Verteporfin as a photosensitizer at low doses (≤30 μg/ml).
• Testing the method on both 2D and 3D cell cultures, including through ~100 microns of tumor nodules.

Main Results:

• Achieved apoptosis induction with close-to-cellular level resolution.
• Demonstrated treatment times on the order of seconds.
• Successfully treated samples through approximately 100 microns of dense tumor nodules in 3D cultures.

Conclusions:

• The developed method enables rapid and selective induction of apoptosis in tumor nodules.
• 3D-resolved widefield temporal focusing offers a promising approach for precise photodynamic therapy.
• The technique shows potential for treating tumors with improved depth penetration and speed.