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Zhang K, Timilsina S, Waguespack M, Kercher EM, Spring BQ. An open-source LED array illumination system for automated multiwell plate cell culture photodynamic therapy experiments. Sci Rep 2022; 12:19341. [PMID: 36369334 PMCID: PMC9652332 DOI: 10.1038/s41598-022-22020-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Accepted: 10/07/2022] [Indexed: 11/13/2022] Open
Abstract
Photodynamic therapy (PDT) research would benefit from an automated, low-cost, and easy-to-use cell culture light treatment setup capable of illuminating multiple well replicates within standard multiwell plate formats. We present an LED-array suitable for performing high-throughput cell culture PDT experiments. The setup features a water-cooling loop to keep the LED-array temperature nearly constant, thus stabilizing the output power and spectrum. The setup also features two custom-made actuator arms, in combination with a pulse-width-modulation (PWM) technique, to achieve programmable and automatic light exposures for PDT. The setup operates at ~ 690 nm (676-702 nm, spectral output full-width half-maximum) and the array module can be readily adapted to other LED wavelengths. This system provides an illumination field with adjustable irradiance up to 400 mW/cm2 with relatively high spectral and power stability comparing with previously reported LED-based setups. The light doses provided by the LED array were validated with comparison to traditional laser PDT. This open-source illumination platform (including the detailed technical description, fabrication protocols, and parts list provided here) helps to make custom light sources more accessible and of practical use for photomedicine research.
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Affiliation(s)
- Kai Zhang
- Translational Biophotonics Cluster, Northeastern University, 360 Huntington Ave., Boston, 02115, USA.,Department of Physics, College of Science, Northeastern University, 360 Huntington Ave., Boston, 02115, USA
| | - Sudip Timilsina
- Translational Biophotonics Cluster, Northeastern University, 360 Huntington Ave., Boston, 02115, USA.,Department of Physics, College of Science, Northeastern University, 360 Huntington Ave., Boston, 02115, USA
| | - Matthew Waguespack
- Translational Biophotonics Cluster, Northeastern University, 360 Huntington Ave., Boston, 02115, USA.,Department of Physics, College of Science, Northeastern University, 360 Huntington Ave., Boston, 02115, USA
| | - Eric M Kercher
- Translational Biophotonics Cluster, Northeastern University, 360 Huntington Ave., Boston, 02115, USA.,University of Massachusetts Medical School, 55 Lake Ave. N, Worcester, MA, 01655, USA
| | - Bryan Q Spring
- Translational Biophotonics Cluster, Northeastern University, 360 Huntington Ave., Boston, 02115, USA. .,Department of Physics, College of Science, Northeastern University, 360 Huntington Ave., Boston, 02115, USA. .,Department of Bioengineering, College of Engineering, Northeastern University, 360 Huntington Ave., Boston, 02115, USA.
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