Eric M Kercher1,2, Kai Zhang1,2, Matt Waguespack1,2, Ryan T Lang1,2, Alejandro Olmos3, Bryan Q Spring1,2,4. 1. Northeastern University, Translational Biophotonics Cluster, Boston, Massachusetts, United States. 2. Northeastern University, Department of Physics, Boston, Massachusetts, United States. 3. Northeastern University, Department of Health Sciences, Boston, Massachusetts, United States. 4. Northeastern University, Department of Bioengineering, Boston, Massachusetts, United States.
Abstract
SIGNIFICANCE: Commercial lasers, lamps, and light-emitting diode (LED) light sources have stimulated the clinical translation of photodynamic therapy (PDT). Yet, the continued exploration of new photosensitizers (PSs) for PDT often requires separate activation wavelengths for each agent being investigated. Customized light sources for such research frequently come at significant financial or technical cost, especially when compounded over many agents and wavelengths. AIM: LEDs offer potential as a cost-effective tool for new PS and multi-PS photodynamic research. A low-cost-per-wavelength tool leveraging high-power LEDs to facilitate efficient and versatile research is needed to further accelerate research in the field. APPROACH: We developed and validated a high-power LED array system for benchtop PDT with a modular design for efficient switching between wavelengths that overcome many challenges in light source design. We describe the assembly of a low-cost LED module plus the supporting infrastructure, software, and protocols to streamline typical in vitro PDT experimentation. RESULTS: The LED array system is stable at intensities in excess of 100 mW / cm2 with 2.3% variation across the illumination field, competitive with other custom and commercial devices. To demonstrate efficacy and versatility, a primary ovarian cancer cell line was treated with two widely used PSs, aminolevulinic acid and verteporfin, using the LED modules at a clinically relevant 50 J / cm2 light dose that induced over 90% cell death for each treatment. CONCLUSIONS: Our work provides the community with a tool for new PS and multi-PS benchtop photodynamic research that, unlike most commercial light sources, affords the user a low barrier to entry and low-cost-per-wavelength with the goal of illuminating new insights at the forefront of PDT.
SIGNIFICANCE: Commercial lasers, lamps, and light-emitting diode (LED) light sources have stimulated the clinical translation of photodynamic therapy (PDT). Yet, the continued exploration of new photosensitizers (PSs) for PDT often requires separate activation wavelengths for each agent being investigated. Customized light sources for such research frequently come at significant financial or technical cost, especially when compounded over many agents and wavelengths. AIM: LEDs offer potential as a cost-effective tool for new PS and multi-PS photodynamic research. A low-cost-per-wavelength tool leveraging high-power LEDs to facilitate efficient and versatile research is needed to further accelerate research in the field. APPROACH: We developed and validated a high-power LED array system for benchtop PDT with a modular design for efficient switching between wavelengths that overcome many challenges in light source design. We describe the assembly of a low-cost LED module plus the supporting infrastructure, software, and protocols to streamline typical in vitro PDT experimentation. RESULTS: The LED array system is stable at intensities in excess of 100 mW / cm2 with 2.3% variation across the illumination field, competitive with other custom and commercial devices. To demonstrate efficacy and versatility, a primary ovarian cancer cell line was treated with two widely used PSs, aminolevulinic acid and verteporfin, using the LED modules at a clinically relevant 50 J / cm2 light dose that induced over 90% cell death for each treatment. CONCLUSIONS: Our work provides the community with a tool for new PS and multi-PS benchtop photodynamic research that, unlike most commercial light sources, affords the user a low barrier to entry and low-cost-per-wavelength with the goal of illuminating new insights at the forefront of PDT.
Authors: Maria Emília de Abreu Chaves; Angélica Rodrigues de Araújo; André Costa Cruz Piancastelli; Marcos Pinotti Journal: An Bras Dermatol Date: 2014 Jul-Aug Impact factor: 1.896
Authors: Juan Zhang; Chengshi Jiang; João Paulo Figueiró Longo; Ricardo Bentes Azevedo; Hua Zhang; Luis Alexandre Muehlmann Journal: Acta Pharm Sin B Date: 2017-09-22 Impact factor: 11.413