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Díaz Tovar JS, Kassab G, Inada NM, Bagnato VS, Kurachi C. Photobleaching Kinetics and Effect of Solvent in the Photophysical Properties of Indocyanine Green for Photodynamic Therapy. Chemphyschem 2023; 24:e202300381. [PMID: 37431987 DOI: 10.1002/cphc.202300381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Revised: 07/06/2023] [Accepted: 07/10/2023] [Indexed: 07/12/2023]
Abstract
Indocyanine green is an attractive molecule for photodynamic therapy due to its near infrared absorption, resulting in a higher tissue penetration. However, its quantum yields of the triplet and singlet state have been reported to be low and then, reactive oxygen species are unlikely to be formed. Aiming to understand the ICG role in photodynamic response, its photobleaching behavior in solution has been studied under distinct conditions of CW laser irradiation at 780 and 808 nm, oxygen saturations and solvents. Sensitizer bleaching and photoproduct formation were measured by absorption spectroscopy and analyzed using the PDT bleaching macroscopic model to extract physical parameters. ICG photobleaching occurs even at lower oxygen concentrations, indicating that the molecule presents more than one way of degradation. Photoproducts were produced even in solution of less than 4 % oxygen saturation for both solvents and excitation wavelengths. Also, the amplitude of absorption related to J-dimers was increased during irradiation, but only in 50 % PBS solution. The formation of photoproducts was enhanced in the presence of J-type dimers under low oxygen concentration, and the quantum yields of triplet and singlet states were one order of magnitude and two times higher, respectively, when compared to ICG in distilled H2 O.
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Affiliation(s)
- Johan Sebastián Díaz Tovar
- São Carlos Institute of Physics, University of São Paulo, Avenida Trabalhador São-carlense, n° 400 Parque Arnold Schimidt - CEP, 13566-590, São Carlos, SP, Brazil
| | - Giulia Kassab
- São Carlos Institute of Physics, University of São Paulo, Avenida Trabalhador São-carlense, n° 400 Parque Arnold Schimidt - CEP, 13566-590, São Carlos, SP, Brazil
| | - Natalia Mayumi Inada
- São Carlos Institute of Physics, University of São Paulo, Avenida Trabalhador São-carlense, n° 400 Parque Arnold Schimidt - CEP, 13566-590, São Carlos, SP, Brazil
| | - Vanderlei Salvador Bagnato
- São Carlos Institute of Physics, University of São Paulo, Avenida Trabalhador São-carlense, n° 400 Parque Arnold Schimidt - CEP, 13566-590, São Carlos, SP, Brazil
| | - Cristina Kurachi
- São Carlos Institute of Physics, University of São Paulo, Avenida Trabalhador São-carlense, n° 400 Parque Arnold Schimidt - CEP, 13566-590, São Carlos, SP, Brazil
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Zhang W, Su P, Ma J, Tan Y, Gong M, Ma L. An Approach to Improve Energy Efficiency during Antimicrobial Blue Light Inactivation: Application of Pulse-Width Modulation Dimming to Balance Irradiance and Irradiation Time. Antibiotics (Basel) 2023; 12:1431. [PMID: 37760727 PMCID: PMC10525104 DOI: 10.3390/antibiotics12091431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 09/03/2023] [Accepted: 09/07/2023] [Indexed: 09/29/2023] Open
Abstract
Antimicrobial blue light (aBL) is an effective non-destructive inactivation technique and has received increasing attention. Despite its significance, the existing research has not thoroughly delved into the impacts of irradiance and irradiation time on enhancing energy efficiency during aBL inactivation and the explanation of the enhancement effect of pulse exposure. In this paper, a series of Escherichia coli inactivation experiments with different duty cycles, pulse frequencies, and irradiation times were conducted, and the relative concentrations of reactive oxygen species (ROS) were measured under corresponding conditions. A two-dimensional (2-D) Hom model was proposed to evaluate the effect of irradiance and irradiation time. The results show that, compared to continuous exposure, pulsed aBL (duty cycle = 25%) can save ~37% of the energy to achieve the same inactivation effect and generate a 1.95 times higher ROS concentration. The 2-D Hom model obtains the optimal combination of average irradiance and time according to the desired reduction and shows that the irradiation time has a higher weight than the irradiance (1.677 and 1.083, respectively). Therefore, using pulse exposure with a lower average irradiance for a longer period of time can achieve a better inactivation effect when consuming equivalent energy. The proposed pulse-width modulation dimming approach helps promote the application of the aBL technique.
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Affiliation(s)
- Wanqing Zhang
- Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China; (W.Z.); (P.S.); (M.G.)
| | - Ping Su
- Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China; (W.Z.); (P.S.); (M.G.)
| | - Jianshe Ma
- Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China; (W.Z.); (P.S.); (M.G.)
| | - Ying Tan
- Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China; (W.Z.); (P.S.); (M.G.)
| | - Mali Gong
- Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China; (W.Z.); (P.S.); (M.G.)
- Department of Precision Instrument, Tsinghua University, Beijing 100084, China
| | - Liya Ma
- Shenzhen Baoan Women and Children’s Hospital, Jinan University, Shenzhen 518100, China;
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3
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de Melo NJ, Tovar JSD, Dovigo LN, Dias LD, Bagnato VS, Inada NM. Natural versus synthetic curcuminoids as photosensitizers: photobleaching and antimicrobial photodynamic therapy evaluation. Photodiagnosis Photodyn Ther 2023; 42:103495. [PMID: 36940789 DOI: 10.1016/j.pdpdt.2023.103495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 03/01/2023] [Accepted: 03/01/2023] [Indexed: 03/23/2023]
Abstract
Antimicrobial photodynamic therapy (aPDT) has been studied as an alternative to combat bacterial resistance to the commonly used antibiotics. aPDT requires the use of a photosensitizer and curcumin is one of the more promising, though the usage of natural curcumin can be inconsistent in certain biomedical uses due to differences in soil condition and turmeric age, besides a large quantity of the plant is necessary to obtain useful amounts of the actual molecule. As such, a synthetic analogue is preferred as it is pure, and its components are better characterized. The present work studied photophysical differences in both natural and synthetic curcumin using photobleaching experiments and searched for whether differences existed in aPDT studies against Staphylococcus aureus. The results showed a faster O2 consumption and a singlet oxygen's generation rate lower by the synthetic curcumin, in comparison with the natural derivative. However, no statistical difference was observed when inactivating S. aureus and these results were following a concentration-based pattern. Thus, the use of synthetic curcumin is indicated, as it can be obtained in controlled amounts and with less environmental impact. Although there are small changes in a photophysical context comparing natural versus synthetic curcumins, we did not observe statistical differences in the photoinactivation of S.aureus bacteria, and reproducibility in biomedical contexts is better achieved with the synthetic analogue.
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Affiliation(s)
- Nicolas Junhiti de Melo
- University of São Paulo, São Carlos Institute of Physics, Group of Optics, São Carlos, SP, Brazil
| | - Johan S D Tovar
- University of São Paulo, São Carlos Institute of Physics, Group of Optics, São Carlos, SP, Brazil
| | - Lívia Nordi Dovigo
- Univ Estadual Paulista, Araraquara Dental School, Department of Social Dentistry, Araraquara, SP, Brazil
| | - Lucas D Dias
- University of São Paulo, São Carlos Institute of Physics, Group of Optics, São Carlos, SP, Brazil
| | - Vanderlei Salvador Bagnato
- University of São Paulo, São Carlos Institute of Physics, Group of Optics, São Carlos, SP, Brazil; Hagler Institute for Advanced Studies, Texas A&M University, College Station, Texas, United States of America
| | - Natalia Mayumi Inada
- University of São Paulo, São Carlos Institute of Physics, Group of Optics, São Carlos, SP, Brazil.
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Zhang W, Su P, Ma J, Gong M, Ma L, Wang J. A singlet state oxygen generation model based on the Monte Carlo method of visible antibacterial blue light inactivation. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2023; 239:112628. [PMID: 36610348 DOI: 10.1016/j.jphotobiol.2022.112628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 11/22/2022] [Accepted: 12/13/2022] [Indexed: 12/23/2022]
Abstract
Visible antibacterial blue light (VABL) has received much attention recently as a nondestructive inactivation approach. However, due to the sparse distribution of bacteria, the light energy evaluation method used in existing studies is inaccurate. Thus, the sensitivity of microorganisms to VABL in different experiments cannot be compared. In this paper, a Monte Carlo-based photon transport model with the optimized scattering phase function was constructed. The model calculated the spatial light energy distribution and the temporal distribution of cumulative singlet state oxygen (CSO) under various cell and medium parameters. The simulation results show that when the cells are sparsely distributed, <30% of light energy from the light source is absorbed by microbes and participates in photochemical reactions. The CSO produced increases with cell density and cell size. Little light energy is available, and thus, the concentration of CSO produced is insufficient to inactivate microbes at deeper depths. As the light intensity and inactivation time increased, the production of singlet state oxygen tended to level off. The model proposed here can quantify the generation of singlet state oxygen and provide a more accurate light energy guide for the VABL inactivation process.
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Affiliation(s)
- Wanqing Zhang
- Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Ping Su
- Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Jianshe Ma
- Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China.
| | - Mali Gong
- Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China; Department of Precision Instrument, Tsinghua University, Beijing 100084, China
| | - Liya Ma
- Shenzhen Baoan Women and Children's Hospital, Jinan University, Shenzhen 518100, China
| | - Jing Wang
- College of Water Conservancy, Yunnan Agricultural University, Kunming 650000, China
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Vaziri MRR, Ranjbar S, Beigzadeh AM, Sharif S. Experimental investigation and simultaneous modeling of the effect of methylene blue addition to cancer tumors in photodynamic therapy by digital holography. Photodiagnosis Photodyn Ther 2022; 40:103153. [PMID: 36228979 DOI: 10.1016/j.pdpdt.2022.103153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Revised: 09/20/2022] [Accepted: 10/07/2022] [Indexed: 11/05/2022]
Abstract
BACKGROUND Although many types of cancers can be treated with surgery, alternatives such as photodynamic therapy with simultaneous use of photosensitive materials and illumination can also be used. Knowing the dose of absorbed energy from the light beam in the photo-sensitized tumors and tissues has an important role in designing the optimal irradiation method with the aim of investigating the amount of received damage to the healthy and tumor tissues. METHODS In this study, the effect of the presence of methylene blue sensitizer on the amount of dose received in tissue-equivalent material has been investigated experimentally by Mach-Zehnder interferometry and digital holography. The Monte Carlo method and the ValoMC code have been used to confirm the results obtained in the experimental phase. RESULTS The results indicate the positive role of methylene blue in increasing the absorbed dose of tumor-equivalent material. The amount of light dose increase and the two-dimensional profile of the dose absorbed in tissue and tumor equivalent materials have been measured by digital holography. CONCLUSIONS The method presented in this work can be used in treatment design and real time measuring of the spatially resolved distribution of the absorbed dose in the tissues containing tumors.
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Affiliation(s)
| | - Sepideh Ranjbar
- Applied Physics Group, Faculty of Physics and Energy Engineering, Amirkabir University of Technology, Tehran, Iran
| | - Amir Mohammad Beigzadeh
- Radiation Application Research School, Nuclear Science and Technology Research Institute, Tehran, Iran
| | - Samaneh Sharif
- Medical Genetics Research Center, Mashhad University of Medical Sciences, Azadi square, Mashhad, Iran.
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Singlet Oxygen In Vivo: It Is All about Intensity. J Pers Med 2022; 12:jpm12060891. [PMID: 35743675 PMCID: PMC9224567 DOI: 10.3390/jpm12060891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 05/25/2022] [Accepted: 05/25/2022] [Indexed: 11/17/2022] Open
Abstract
The presented work addresses the influence of illumination intensity on the amount and locations of singlet oxygen generation in tumor tissue. We used time-resolved optical detection at the typical emission wavelength around 1270 nm and at 1200 nm where there is no singlet oxygen phosphorescence to determine the phosphorescence kinetics. The discussed data comprise in vivo measurements in tumor-laden HET-CAM and mice. The results show that illumination that is too intense is a major issue, affecting many PDT treatments and all singlet oxygen measurements in vivo so far. In such cases, photosensitization and oxygen consumption exceed oxygen supply, limiting singlet oxygen generation to the blood vessels and walls, while photosensitizers in the surrounding tissue will likely not participate. Being a limitation for the treatment, on one hand, on the other, this finding offers a new method for tumor diagnosis when using photosensitizers exploiting the EPR effect. In contrast to high-intensity PDT, some papers reported successful treatment with nanoparticular drugs using much lower illumination intensity. The question of whether, with such illumination, singlet oxygen is indeed generated in areas apart from vessels and walls, is addressed by numerical analysis. In addition, we discuss how to perform measurements at such low intensities.
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7
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Efendiev KT, Alekseeva PM, Shiryaev AA, Skobeltsin AS, Solonina IL, Fatyanova AS, Reshetov IV, Loschenov VB. Preliminary low-dose photodynamic exposure to the skin cancer with chlorin e6 photosensitizer. Photodiagnosis Photodyn Ther 2022; 38:102894. [PMID: 35490962 DOI: 10.1016/j.pdpdt.2022.102894] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 04/26/2022] [Accepted: 04/27/2022] [Indexed: 01/10/2023]
Abstract
BACKGROUND The study was aimed to investigate the chlorin e6 photosensitizer distribution in the tumor and tumor border (5 mm) during low-dose photodynamic treatment and to increase the effectiveness of the therapy for skin neoplasms. METHODS Sensitized boundaries of neoplasms were evaluated by video fluorescence imaging. The study of changes in the chlorin e6 distribution before/after photodynamic therapy and in the process of low-dose photodynamic exposure was carried out by the method of spectral fluorescence diagnostics. RESULTS All 19 patients with basal-cell skin cancer had a contrast of chlorin e6 accumulation compared to normal tissues. 3 hours after intravenous administration of the photosensitizer at a dose of 1 mg/kg, the chlorin e6 concentration was: in normal tissues - 0.18 mg/kg, in the tumor - 1.26 mg/kg, in the tumor border - 0.63 mg/kg. In most cases, the fluorescence indices of chlorin e6 in tumor tissues after low-dose photodynamic therapy increased and exceeded the values before light exposure. CONCLUSION Low-dose photodynamic therapy seems to be the optimal method for treating neoplasms, which does not cause severe pain in patients during the light exposure and allows locally increasing of the photosensitizer concentration in tumor tissues. This method of photodynamic therapy can improve the effectiveness of thе treatment.
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Affiliation(s)
- K T Efendiev
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia; National Research Nuclear University "MEPhI", 115409 Moscow, Russia.
| | - P M Alekseeva
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia; National Research Nuclear University "MEPhI", 115409 Moscow, Russia
| | - A A Shiryaev
- University Clinical Hospital No. 1, Levshin Institute of Cluster Oncology, Sechenov First Moscow State Medical University, Ministry of Health of the Russian Federation, 119435 Moscow, Russia
| | - A S Skobeltsin
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia; National Research Nuclear University "MEPhI", 115409 Moscow, Russia
| | - I L Solonina
- University Clinical Hospital No. 1, Levshin Institute of Cluster Oncology, Sechenov First Moscow State Medical University, Ministry of Health of the Russian Federation, 119435 Moscow, Russia
| | - A S Fatyanova
- University Clinical Hospital No. 1, Levshin Institute of Cluster Oncology, Sechenov First Moscow State Medical University, Ministry of Health of the Russian Federation, 119435 Moscow, Russia
| | - I V Reshetov
- University Clinical Hospital No. 1, Levshin Institute of Cluster Oncology, Sechenov First Moscow State Medical University, Ministry of Health of the Russian Federation, 119435 Moscow, Russia
| | - V B Loschenov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia; National Research Nuclear University "MEPhI", 115409 Moscow, Russia
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Damrongrungruang T, Rattanayatikul S, Sontikan N, Wuttirak B, Teerakapong A, Kaewrawang A. Effect of Different Irradiation Modes of Azulene-mediated Photodynamic Therapy on Singlet Oxygen and PGE 2 Formation. Photochem Photobiol 2020; 97:427-434. [PMID: 33075141 DOI: 10.1111/php.13346] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 10/13/2020] [Accepted: 10/14/2020] [Indexed: 01/13/2023]
Abstract
Azulene samples in ethanol/distilled water (1, 10 and 100 µm) were irradiated with a 638 nm red laser (0.5 watts, light-to-target distance 2 cm, energy density 4 or 40 J cm-2 ) by either continuous, fractionation or pulse mode. Singlet oxygen in the samples was measured using 10 µm 9,10-dimethyl anthracene (positive control 10 μm erythrosine) and relative fluorescence intensities were measured at 375/436 nm excitation/emission. Peripheral blood mononuclear cells (PBMCs, 1 × 105 cells/well) preincubated with 0.01 μg mL-1 rhTNF-α for 6 h were cultured with irradiated azulene samples in RPMI-1640 under standard conditions. PGE2 was quantified by rhPGE2 ELISA kit using a Varioscan® microplate reader at an excitation wavelength of 420 nm. Kruskal Wallis with Dunn`s test was performed at a significance level of P < 0.05. The highest singlet oxygen amount was found in 10 µm azulene samples irradiated at 40 J cm-2 under continuous mode (P = 0.001 when compared with 10 µm erythrosine). PGE2 expression in rhTNF-α-induced PBMCs was reduced to 45% of control by 1 µm azulene irradiated at 40 J cm-2 under fractionation mode. Fractionation mode with intermediate laser energy density in the presence of low concentration of azulene could increase singlet oxygen and tend to reduce PGE2 .
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Affiliation(s)
- Teerasak Damrongrungruang
- Division of Oral Diagnosis, Department of Oral Biomedical Sciences, Faculty of Dentistry, Khon Kaen University, Khon Kaen, Thailand.,Laser in Dentistry Research Group, Khon Kaen University, Khon Kaen, Thailand.,Melatonin Research Group, Khon Kaen University, Khon Kaen, Thailand
| | | | | | | | - Aroon Teerakapong
- Laser in Dentistry Research Group, Khon Kaen University, Khon Kaen, Thailand.,Division of Periodontology, Department of Oral Biomedical Sciences, Faculty of Dentistry, Khon Kaen University, Khon Kaen, Thailand
| | - Arkom Kaewrawang
- Department of Electrical Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen, Thailand
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Sánchez V, Garcia MR, Requena MB, Romano RA, de Boni L, Guimarães FEG, Pratavieira S. Theoretical and Experimental Analysis of Protoporphyrin IX Photodegradation Using Multi-Wavelength Light Sources. Photochem Photobiol 2020; 96:1208-1214. [PMID: 32668506 DOI: 10.1111/php.13311] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Accepted: 07/09/2020] [Indexed: 12/25/2022]
Abstract
Photodynamic procedures have been used in many applications, ranging from cancer treatment to microorganism inactivation. Photodynamic reactions start with the activation of a photosensitizing molecule with light, leading to the production of cytotoxic molecules that promote cell death. However, establishing the correct light and photosensitizer dosimetry for a broadband light source remains challenging. In this study, we proposed a theoretical mathematical model for the photodegradation of protoporphyrin IX (PpIX), when irradiated by multi-wavelength light sources. The theoretical model predicts the experimental photobleaching (temporal change in PpIX concentration) of PpIX for different light sources. We showed that photobleaching occurs independently of the light source wavelengths but instead depends only on the number of absorbed photons. The model presented here can be used as an important mathematical approach to better understand current photodynamic therapy protocols and help achieve optimization of the doses delivered.
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Affiliation(s)
- Víctor Sánchez
- São Carlos Institute of Physics, University of São Paulo, São Carlos, SP, Brazil.,Gleb Wataghin Physics Institute, University of Campinas, Campinas, SP, Brazil
| | | | | | - Renan Arnon Romano
- São Carlos Institute of Physics, University of São Paulo, São Carlos, SP, Brazil
| | - Leonardo de Boni
- São Carlos Institute of Physics, University of São Paulo, São Carlos, SP, Brazil
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Zhou J, Sun C, Yu C. Highly-controllable drug release from core cross-linked singlet oxygen-responsive nanoparticles for cancer therapy. RSC Adv 2020; 10:19997-20008. [PMID: 35520443 PMCID: PMC9054206 DOI: 10.1039/d0ra02053b] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Accepted: 05/14/2020] [Indexed: 11/21/2022] Open
Abstract
Highly-controllable release consisting of preventing unnecessary drug leakage at physiologically normal tissues and triggering sufficient drug release at tumor sites is the main aim of nanoparticle-based tumor therapy. Developing drug-conjugation strategies with covalent bonds in response to a characteristic stimulus, such as reactive oxygen species (ROS) generated by photodynamic therapy (PDT) has attracted much attention. ROS can not only cause cytotoxicity, but also trigger the cleavage of ROS-responsive linkers. Therefore, it is feasible to design a new model of controlled drug release via the breakage of ROS-responsive linkers and degradation of nanoparticles. The self-supply of the stimulus and highly-controllable drug release can be achieved by encapsulation of photosensitizer (PS) and chemotherapeutic drugs simultaneously without any support of tumor endogenous stimuli. Therefore, we used thioketal (TK) linkers as the responsive linkers due to their reaction with singlet oxygen (1O2, SO), a type of ROS. They were conjugated to the side groups of polyphosphoesters (PPE) via click chemistry to acquire the core cross-linked SO-responsive PPE nanoparticles poly(thioketal phosphoesters) (TK-PPE). TK-PPE coated with the photosensitizer chlorin e6 (Ce6) and chemotherapeutic drug doxorubicin (DOX) simultaneously were prepared and named as TK-PPECe6&DOX. TK-PPECe6&DOX kept stable due to the high stability of the TK-linkers in the normal physiological environment. With self-production of SO as the stimulating factor from the encapsulated Ce6, highly-controlled drug release was achieved. After incubation of tumor cells, 660 nm laser irradiation induced SO generation, resulting in the cleavage of TK-linkers and boosted-release of DOX. Highly-controllable drug release of TK-PPECe6&DOX through self-production of stimulus increased antitumor efficacy, offering a promising avenue for clinical on-demand chemotherapy. Core cross-linked singlet oxygen-responsive nanoparticle TK-PPECe6&DOX could achieve highly-controllable drug release through self-production of SO as the stimulus to increase antitumor efficacy for cancer therapy.![]()
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Affiliation(s)
- Jiayan Zhou
- Department of Radiology and Tianjin Key Laboratory of Functional Imaging, Tianjin Medical University General Hospital Tianjin 300052 P. R. China
| | - Chunyang Sun
- Department of Radiology and Tianjin Key Laboratory of Functional Imaging, Tianjin Medical University General Hospital Tianjin 300052 P. R. China
| | - Chunshui Yu
- Department of Radiology and Tianjin Key Laboratory of Functional Imaging, Tianjin Medical University General Hospital Tianjin 300052 P. R. China
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Hackbarth S, Islam W, Fang J, Šubr V, Röder B, Etrych T, Maeda H. Singlet oxygen phosphorescence detection in vivo identifies PDT-induced anoxia in solid tumors. Photochem Photobiol Sci 2019; 18:1304-1314. [DOI: 10.1039/c8pp00570b] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Extracorporeal measurements through the skin achieve sufficient SNR to analyze 1O2 kinetics and evaluate PDT efficiency.
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Affiliation(s)
- Steffen Hackbarth
- Photobiophysics
- Institute of Physics
- Humboldt University of Berlin
- 12489 Berlin
- Germany
| | - Waliul Islam
- Department of Microbiology
- Graduate School of Medical Sciences
- Kumamoto University
- Kumamoto 860-8556
- Japan
| | - Jun Fang
- Laboratory of Microbiology and Oncology
- Faculty of Pharmaceutical Sciences
- Sojo University
- Kumamoto 860-0082
- Japan
| | - Vladimír Šubr
- Institute of Macromolecular Chemistry
- Czech Academy of Sciences
- 16206 Prague
- Czech Republic
| | - Beate Röder
- Photobiophysics
- Institute of Physics
- Humboldt University of Berlin
- 12489 Berlin
- Germany
| | - Tomáš Etrych
- Institute of Macromolecular Chemistry
- Czech Academy of Sciences
- 16206 Prague
- Czech Republic
| | - Hiroshi Maeda
- BioDynamics Research Foundation
- Kumamoto 862-0954
- Japan
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12
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López-Marín N, Mulet R, Rodríguez R. Photodynamic therapy: Toward a systemic computational model. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2018; 189:201-213. [PMID: 30396131 DOI: 10.1016/j.jphotobiol.2018.10.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Revised: 10/03/2018] [Accepted: 10/25/2018] [Indexed: 01/13/2023]
Abstract
We have designed a systemic model to understand the effect of Photodynamic Therapy (PDT) on long time scales. The model takes into account cell necrosis due to oxygen reactive species, cell apoptosis through the caspase pathway and the competition between healthy and tumor cells. We attempted to describe the system using state of the art computational techniques (necrosis and apoptosis) and simple models that allow a deeper understanding of the long time scale processes involved (healing and tumor growth). We analyzed the influence of the surface and tumor depth on the effectiveness of different treatment plans and we proposed, for the set of parameters used in this work, an optimum timing between sessions of PDT.
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Affiliation(s)
- N López-Marín
- Group of Complex Systems and Statistical Physics, Department of General Physics, Physics Faculty, University of Havana, La Habana, CP 10400, Cuba.
| | - R Mulet
- Group of Complex Systems and Statistical Physics, Department of Theoretical Physics, Physics Faculty, University of Havana, La Habana, CP 10400, Cuba.
| | - R Rodríguez
- Department of Computational Medicine, National Institute of Nephrology, La Habana CP 10600, Cuba
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13
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Vignion-Dewalle AS, Baert G, Thecua E, Lecomte F, Vicentini C, Abi-Rached H, Mortier L, Mordon S. Comparison of 10 efficient protocols for photodynamic therapy of actinic keratosis: How relevant are effective light dose and local damage in predicting the complete response rate at 3 months? Lasers Surg Med 2018; 50:576-589. [PMID: 29667728 DOI: 10.1002/lsm.22827] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/28/2018] [Indexed: 11/07/2022]
Abstract
BACKGROUND Topical photodynamic therapy is an established treatment modality for various dermatological conditions, including actinic keratosis. In Europe, the approved protocols for photodynamic therapy of actinic keratosis involve irradiation with either an Aktilite CL 128 lamp or daylight, whereas irradiation with the Blu-U illuminator is approved in the United States. Many other protocols using irradiation by a variety of light sources are also clinically efficient. OBJECTIVES This paper aims to compare 10 different protocols with clinically proven efficacy for photodynamic therapy of actinic keratosis and the available spectral irradiance of the light source. Effective irradiance, effective light dose, and local damage are compared. We also investigate whether there is an association between the complete response rate at 3 months and the effective light dose or local damage. METHODS The effective irradiance, also referred to as protoporphyrin IX-weighted irradiance, is obtained by integrating the spectral irradiance weighted by the normalized absorption spectrum of protoporphyrin IX over the wavelength. Integrating the effective irradiance over the irradiation time yields the effective light dose, which is also known as the protoporphyrin IX-weighted light dose. Local damage, defined as the total cumulative singlet oxygen molecules produced during treatment, is estimated using mathematical modeling of the photodynamic therapy process. This modeling is based on an iterative procedure taking into account the spatial and temporal variations in the protoporphyrin IX absorption spectrum during treatment. RESULTS The protocol for daylight photodynamic therapy on a clear sunny day, the protocol for daylight photodynamic therapy on an overcast day, the photodynamic therapy protocol for a white LED lamp for operating rooms and the photodynamic therapy protocol for the Blu-U illuminator perform better than the six other protocols-all involving red light illumination-in terms of both effective light dose and local damage. However, no association between the complete response rate at 3 months and the effective light dose or local damage was found. CONCLUSIONS Protocols that achieve high complete response rates at 3 months and low pain scores should be preferred regardless of the effective light dose and local damage. Lasers Surg. Med. 50:576-589, 2018. © 2018 Wiley Periodicals, Inc.
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Affiliation(s)
- Anne-Sophie Vignion-Dewalle
- Univ. Lille, INSERM, CHU Lille, U1189-ONCO-THAI-Image Assisted Laser Therapy for Oncology, Lille, F-59000, France
| | - Gregory Baert
- Univ. Lille, INSERM, CHU Lille, U1189-ONCO-THAI-Image Assisted Laser Therapy for Oncology, Lille, F-59000, France
| | - Elise Thecua
- Univ. Lille, INSERM, CHU Lille, U1189-ONCO-THAI-Image Assisted Laser Therapy for Oncology, Lille, F-59000, France
| | - Fabienne Lecomte
- Univ. Lille, INSERM, CHU Lille, U1189-ONCO-THAI-Image Assisted Laser Therapy for Oncology, Lille, F-59000, France
| | - Claire Vicentini
- Univ. Lille, INSERM, CHU Lille, U1189-ONCO-THAI-Image Assisted Laser Therapy for Oncology, Lille, F-59000, France.,Department of Dermatology, CHU Lille, Lille, F-5900, France
| | - Henry Abi-Rached
- Univ. Lille, INSERM, CHU Lille, U1189-ONCO-THAI-Image Assisted Laser Therapy for Oncology, Lille, F-59000, France.,Department of Dermatology, CHU Lille, Lille, F-5900, France
| | - Laurent Mortier
- Univ. Lille, INSERM, CHU Lille, U1189-ONCO-THAI-Image Assisted Laser Therapy for Oncology, Lille, F-59000, France.,Department of Dermatology, CHU Lille, Lille, F-5900, France
| | - Serge Mordon
- Univ. Lille, INSERM, CHU Lille, U1189-ONCO-THAI-Image Assisted Laser Therapy for Oncology, Lille, F-59000, France
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14
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Assessment of singlet oxygen dosimetry concepts in photodynamic therapy through computational modeling. Photodiagnosis Photodyn Ther 2018; 21:224-233. [DOI: 10.1016/j.pdpdt.2017.12.016] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Revised: 12/13/2017] [Accepted: 12/28/2017] [Indexed: 12/20/2022]
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15
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Hally C, Rodríguez-Amigo B, Bresolí-Obach R, Planas O, Nos J, Boix-Garriga E, Ruiz-González R, Nonell S. Photodynamic Therapy. THERANOSTICS AND IMAGE GUIDED DRUG DELIVERY 2018. [DOI: 10.1039/9781788010597-00086] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Photodynamic therapy is a clinical technique for the treatment of cancers, microbial infections and other medical conditions by means of light-induced generation of reactive oxygen species using photosensitising drugs. The intrinsic fluorescence of many such drugs make them potential theranostic agents for simultaneous diagnosis and therapy. This chapter reviews the basic chemical and biological aspects of photodynamic therapy with an emphasis on its applications in theranostics. The roles of nanotechnology is highlighted, as well as emerging trends such as photoimmunotherapy, image-guided surgery and light- and singlet-oxygen dosimetry.
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Affiliation(s)
- Cormac Hally
- Institut Químic de Sarrià, Universitat Ramon Llull Via Augusta 390 08017 Barcelona Spain
| | | | - Roger Bresolí-Obach
- Institut Químic de Sarrià, Universitat Ramon Llull Via Augusta 390 08017 Barcelona Spain
| | - Oriol Planas
- Institut Químic de Sarrià, Universitat Ramon Llull Via Augusta 390 08017 Barcelona Spain
| | - Jaume Nos
- Institut Químic de Sarrià, Universitat Ramon Llull Via Augusta 390 08017 Barcelona Spain
| | - Ester Boix-Garriga
- Institut Químic de Sarrià, Universitat Ramon Llull Via Augusta 390 08017 Barcelona Spain
- School of Pharmaceutical Sciences, University of Geneva, University of Lausanne Geneva Switzerland
| | - Rubén Ruiz-González
- Institut Químic de Sarrià, Universitat Ramon Llull Via Augusta 390 08017 Barcelona Spain
| | - Santi Nonell
- Institut Químic de Sarrià, Universitat Ramon Llull Via Augusta 390 08017 Barcelona Spain
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Sánchez V, Romero MP, Pratavieira S, Costa C. Physiological considerations acting on triplet oxygen for explicit dosimetry in photodynamic therapy. Photodiagnosis Photodyn Ther 2017; 19:298-303. [PMID: 28750754 DOI: 10.1016/j.pdpdt.2017.07.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Revised: 07/19/2017] [Accepted: 07/23/2017] [Indexed: 12/29/2022]
Abstract
The aims of this study were to determine the spatial and temporal theoretical distribution of the concentrations of Protoporphyrin IX, 3O2 and doses of 1O2. The type II mechanism and explicit dosimetry in photodynamic therapy were used. Furthermore, the mechanism of respiration and cellular metabolism acting on 3O2 were taken into account. The dermis was considered as an absorbing and a scattering medium. An analytical solution was used for light diffusion in the skin. The photophysical, photochemical and biological effects caused by PDT with the initial irradiances of 20, 60 and 150mW/cm2 were studied for a time of exposure of 20min and a maximum depth of 0.5cm. We found that the initial irradiance triples its value in 0.02cm and that almost 100% of PpIX is part of the dynamics of reactions in photodynamic therapy. Additionally, with about 40μMof 3O2 there is a balance between the consumed and supplied oxygen. Finally, we determined that with 60mW/cm2, the highest dose of 1O2 is obtained.
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Affiliation(s)
- Víctor Sánchez
- Departamento de Física, Facultad de Ciencias, Escuela Politécnica Nacional, Quito, Ecuador
| | - María Paulina Romero
- Departamento de Materiales, Facultad de Ingeniería Mecánica, Escuela Politécnica Nacional, Quito, Ecuador
| | | | - César Costa
- Departamento de Física, Facultad de Ciencias, Escuela Politécnica Nacional, Quito, Ecuador
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17
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Vignion-Dewalle AS, Baert G, Thecua E, Vicentini C, Mortier L, Mordon S. Photodynamic therapy for actinic keratosis: Is the European consensus protocol for daylight PDT superior to conventional protocol for Aktilite CL 128 PDT? JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2017; 174:70-77. [PMID: 28756154 DOI: 10.1016/j.jphotobiol.2017.07.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Revised: 07/06/2017] [Accepted: 07/21/2017] [Indexed: 10/19/2022]
Abstract
BACKGROUND Topical photodynamic therapy (PDT) is an established treatment modality for various dermato-oncologic conditions. In Europe, initially requiring irradiation with red light, PDT of actinic keratosis (AK) can now also be carried out with exposure to daylight that has been clinically proven to be as effective as and less painful than red light. OBJECTIVES In this paper, we propose a comparison between the conventional protocol for Aktilite CL 128 (red light source) PDT and the European consensus protocol for daylight PDT - with the exposure is assumed to be performed during either a clear sunny day or an overcast day - in the treatment of AK with methyl aminolevulinate through a mathematical modeling. METHOD This already published modeling that is based on an iterative procedure alternating determination of the local fluence rate and updating of the local optical properties enables to estimate the local damage induced by the therapy. RESULTS The European consensus protocol for daylight PDT during a sunny day and an overcast day provides, on average, 6.50 and 1.79 times higher PDT local damages at the end of the treatment than those obtained using the conventional protocol for Aktilite CL 128 PDT, respectively. CONCLUSIONS Results analysis shows that, even performed during an overcast day, the European consensus protocol for daylight PDT leads to higher PDT local damages than the efficient conventional protocol for Aktilite CL 128.
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Affiliation(s)
- Anne-Sophie Vignion-Dewalle
- Univ. Lille, INSERM, CHU Lille, U1189 - ONCO-THAI, Image Assisted Laser Therapy for Oncology, F-59000 Lille, France.
| | - Gregory Baert
- Univ. Lille, INSERM, CHU Lille, U1189 - ONCO-THAI, Image Assisted Laser Therapy for Oncology, F-59000 Lille, France
| | - Elise Thecua
- Univ. Lille, INSERM, CHU Lille, U1189 - ONCO-THAI, Image Assisted Laser Therapy for Oncology, F-59000 Lille, France
| | - Claire Vicentini
- Univ. Lille, INSERM, CHU Lille, U1189 - ONCO-THAI, Image Assisted Laser Therapy for Oncology, F-59000 Lille, France
| | - Laurent Mortier
- Univ. Lille, INSERM, CHU Lille, U1189 - ONCO-THAI, Image Assisted Laser Therapy for Oncology, F-59000 Lille, France
| | - Serge Mordon
- Univ. Lille, INSERM, CHU Lille, U1189 - ONCO-THAI, Image Assisted Laser Therapy for Oncology, F-59000 Lille, France
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18
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Penjweini R, Kim MM, Liu B, Zhu TC. Evaluation of the 2-(1-Hexyloxyethyl)-2-devinyl pyropheophorbide (HPPH) mediated photodynamic therapy by macroscopic singlet oxygen modeling. JOURNAL OF BIOPHOTONICS 2016; 9:1344-1354. [PMID: 27653233 PMCID: PMC5159301 DOI: 10.1002/jbio.201600121] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Revised: 07/12/2016] [Accepted: 08/21/2016] [Indexed: 05/02/2023]
Abstract
Photodynamic therapy (PDT) is known as a non-invasive treatment modality that is based on photochemical reactions between oxygen, photosensitizer, and a special wavelength of light. However, a dosimetric predictor for PDT outcome is still elusive because current dosimetric quantities do not account for the differences in the PDT oxygen consumption rate for different fluence rates. In this study, we evaluate several dose metrics, total fluence, photobleaching ratio, PDT dose, and mean reacted singlet oxygen (mean [1 O2 ]rx ) for predicting the PDT outcome and a clinically relevant tumor re-growth endpoint. For this reason, radiation-induced fibrosarcoma (RIF) mice tumors are treated with 2-(1-Hexyloxyethyl)-2-devinyl pyropheophorbide (HPPH) and different in-air fluences (30 J/cm2 , 50 J/cm2 , 135 J/cm2 , 250 J/cm2 , and 350 J/cm2 ) and in-air fluence rates (20, 50, 75, 150 mW/cm2 ). Explicit measurements of HPPH and oxygen concentration as well as tissue optical properties are performed pre- and post-treatment. Then, this information is incorporated into a macroscopic model to calculate the photobleaching, PDT dose, and mean [1 O2 ]rx . Changes in tumor volume are tracked following the treatment and compared with the dose metrics. The correlation demonstrates that mean [1 O2 ]rx serves as a better dosimetric quantity for predicting treatment outcome and a clinically relevant tumor re-growth endpoint.
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Affiliation(s)
| | | | - Baochang Liu
- University of Pennsylvania, School of Medicine, Department of Radiation Oncology, 3400 Civic Center Boulevard TRC 4W, hiladelphia, Pennsylvania 19104, USA
| | - Timothy C. Zhu
- University of Pennsylvania, School of Medicine, Department of Radiation Oncology, 3400 Civic Center Boulevard TRC 4W, hiladelphia, Pennsylvania 19104, USA
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19
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Lopez N, Mulet R, Rodríguez R. Tumor reactive ringlet oxygen approach for Monte Carlo modeling of photodynamic therapy dosimetry. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2016; 160:383-91. [PMID: 27197059 DOI: 10.1016/j.jphotobiol.2016.04.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Revised: 04/01/2016] [Accepted: 04/03/2016] [Indexed: 01/26/2023]
Abstract
Photodynamic therapy (PDT) is an emergent technique used for the treatment of several diseases. It requires the interaction of three components: a photosensitizer, a light source and tissue oxygen. Knowledge of the biophysical aspects of PDT is important for improving dosimetry protocols and treatment planning. In this paper we propose a model to simulate the spatial and temporal distribution of ground state oxygen ((3)O2), cumulative singlet excited state oxygen ((1)O2)rx and photosensitizer, in this case protoporphyrin IX (PpIX) in an ALA mediated PDT treatment. The results are analyzed in order to improve the treatment dosimetry. We compute the light fluence in the tissue using Monte Carlo simulations running in a GPU system. The concentration of (3)O2, ((1)O2)rx and the photosensitizer are calculated using this light fluence and a set of differential equations describing the photochemical reactions involved in PDT. In the model the initial photosensitizer concentration depends on tissue depth and type, moreover we consider blood vessel damage and its effect in the ground state oxygen concentration in the tissue. We introduce the tumor reactive single oxygen (TRSO) as a new dosimetry metric. It represents the amount of singlet oxygen per tumor volume that reacts, during the treatment, with the molecules in the tumor. This quantity integrates the effect of the light irradiance, the optical properties of the tumor and the normal tissue, the oxygen consumption and supply, and the photosensitizer biodistribution on the skin.
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Affiliation(s)
- N Lopez
- Group of Complex Systems and Statistical Physics, Department of General Physics, Physics Faculty, University of Havana, La Habana CP 10400, Cuba.
| | - R Mulet
- Group of Complex Systems and Statistical Physics, Department of Theoretical Physics, Physics Faculty, University of Havana, La Habana CP 10400, Cuba.
| | - R Rodríguez
- Department of Computational Medicine, National Institute of Nephrology. La Habana CP 10600, Cuba; Department of General Physics, Physics Faculty, University of Havana, La Habana CP 10400, Cuba.
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20
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Klimenko VV, Knyazev NA, Moiseenko FV, Rusanov AA, Bogdanov AA, Dubina MV. Pulse mode of laser photodynamic treatment induced cell apoptosis. Photodiagnosis Photodyn Ther 2016; 13:101-107. [DOI: 10.1016/j.pdpdt.2016.01.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Revised: 12/16/2015] [Accepted: 01/06/2016] [Indexed: 11/16/2022]
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21
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Campbell CL, Wood K, Valentine RM, Brown CTA, Moseley H. Monte Carlo modelling of daylight activated photodynamic therapy. Phys Med Biol 2015; 60:4059-73. [DOI: 10.1088/0031-9155/60/10/4059] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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22
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Zhu TC, Liu B, Penjweini R. Study of tissue oxygen supply rate in a macroscopic photodynamic therapy singlet oxygen model. JOURNAL OF BIOMEDICAL OPTICS 2015; 20:038001. [PMID: 25741665 PMCID: PMC4479436 DOI: 10.1117/1.jbo.20.3.038001] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Accepted: 02/04/2015] [Indexed: 05/07/2023]
Abstract
An appropriate expression for the oxygen supply rate (Γ(s)) is required for the macroscopic modeling of the complex mechanisms of photodynamic therapy (PDT). It is unrealistic to model the actual heterogeneous tumor microvascular networks coupled with the PDT processes because of the large computational requirement. In this study, a theoretical microscopic model based on uniformly distributed Krogh cylinders is used to calculate Γ(s) = g (1 - [³O₂]/[³O₂]₀) that can replace the complex modeling of blood vasculature while maintaining a reasonable resemblance to reality; g is the maximum oxygen supply rate and [³O₂]/[³O₂]₀ is the volume-average tissue oxygen concentration normalized to its value prior to PDT. The model incorporates kinetic equations of oxygen diffusion and convection within capillaries and oxygen saturation from oxyhemoglobin. Oxygen supply to the tissue is via diffusion from the uniformly distributed blood vessels. Oxygen can also diffuse along the radius and the longitudinal axis of the cylinder within tissue. The relations of Γ(s) to [³O₂]/[³O₂]₀ are examined for a biologically reasonable range of the physiological parameters for the microvasculature and several light fluence rates (ϕ). The results show a linear relationship between Γ(s) and [³O₂]/[³O₂]₀, independent of ϕ and photochemical parameters; the obtained g ranges from 0.4 to 1390 μM/s.
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Affiliation(s)
- Timothy C. Zhu
- University of Pennsylvania, School of Medicine, Department of Radiation Oncology, Philadelphia, Pennsylvania 19104, United States
- Address all correspondence to: Timothy C. Zhu,
| | - Baochang Liu
- University of Pennsylvania, School of Medicine, Department of Radiation Oncology, Philadelphia, Pennsylvania 19104, United States
| | - Rozhin Penjweini
- University of Pennsylvania, School of Medicine, Department of Radiation Oncology, Philadelphia, Pennsylvania 19104, United States
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23
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Mordon S. A commentary on the role of skin temperature on the effectiveness of ALA-PDT in Dermatology. Photodiagnosis Photodyn Ther 2014; 11:416-9. [DOI: 10.1016/j.pdpdt.2014.05.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Revised: 05/07/2014] [Accepted: 05/08/2014] [Indexed: 11/16/2022]
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24
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Bürgermeister L, López FR, Schulz W. Physical and mathematical modeling of antimicrobial photodynamic therapy. JOURNAL OF BIOMEDICAL OPTICS 2014; 19:71411. [PMID: 24849516 DOI: 10.1117/1.jbo.19.7.071411] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2013] [Accepted: 04/22/2014] [Indexed: 06/03/2023]
Abstract
Antimicrobial photodynamic therapy (aPDT) is a promising method to treat local bacterial infections. The therapy is painless and does not cause bacterial resistances. However, there are gaps in understanding the dynamics of the processes, especially in periodontal treatment. This work describes the advances in fundamental physical and mathematical modeling of aPDT used for interpretation of experimental evidence. The result is a two-dimensional model of aPDT in a dental pocket phantom model. In this model, the propagation of laser light and the kinetics of the chemical reactions are described as coupled processes. The laser light induces the chemical processes depending on its intensity. As a consequence of the chemical processes, the local optical properties and distribution of laser light change as well as the reaction rates. The mathematical description of these coupled processes will help to develop treatment protocols and is the first step toward an inline feedback system for aPDT users.
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Affiliation(s)
- Lisa Bürgermeister
- Fraunhofer Institute for Laser Technology, Steinbachstr. 15, Aachen D-52074, Germany
| | - Fernando Romero López
- Fraunhofer Institute for Laser Technology, Steinbachstr. 15, Aachen D-52074, Germany
| | - Wolfgang Schulz
- Fraunhofer Institute for Laser Technology, Steinbachstr. 15, Aachen D-52074, Germany
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25
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Salas-García I, Fanjul-Vélez F, Arce-Diego JL. Superficial radially resolved fluorescence and 3D photochemical time-dependent model for photodynamic therapy. OPTICS LETTERS 2014; 39:1845-1848. [PMID: 24686620 DOI: 10.1364/ol.39.001845] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Photodynamic therapy (PDT) dosimetric tools are crucial for treatment planning and noninvasive monitoring by means of fluorescence. Present approaches consider usually a 1D problem, a simple photochemical process, or a spatially homogeneous photosensitizer. In this work, a radially resolved superficial photosensitizer fluorescence and 3D photochemical time-dependent PDT model are presented. The model provides a time-dependent estimation of tissue fluorescence and the photosensitizer and singlet oxygen 3D concentrations. The model is applied to a basal cell carcinoma treated by Metvix topical photosensitizer protocol. The analysis shows the potentiality in treatment planning and monitoring. The fluorescence results are in agreement with previous measurements.
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26
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Liu B, Kim MM, Gallagher-Colombo SM, Busch TM, Zhu TC. Comparison of PDT parameters for RIF and H460 tumor models during HPPH-mediated PDT. PROCEEDINGS OF SPIE--THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING 2014; 8931:89311C. [PMID: 25999649 PMCID: PMC4437631 DOI: 10.1117/12.2040241] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Singlet oxygen (1O2) is the major cytotoxic species producing PDT effects, but it is difficult to monitor in vivo due to its short life time in real biological environments. Mathematical models are then useful to calculate 1O2 concentrations for PDT dosimetry. Our previously introduced macroscopic model has four PDT parameters: ξ, σ, β and g describing initial oxygen consumption rate, ratio of photobleaching to reaction between 1O2 and cellular targets, ratio of triplet state (T) phosphorescence to reaction between T and oxygen (3O2), and oxygen supply rate to tissue, respectively. In addition, the model calculates a fifth parameter, threshold 1O2 dose ([1O2]rx,sd). These PDT parameters have been investigated for HPPH using radiation-induced fibrosarcoma (RIF) tumors in an in-vivo C3H mouse model. In recent studies, we additionally investigated these parameters in human non-small cell lung carcinoma (H460) tumor xenografts, also using HPPH-mediated PDT. In-vivo studies are performed with nude female mice with H460 tumors grown intradermally on their right shoulders. HPPH (0.25 mg/kg) is injected i.v. at 24 hours prior to light delivery. Initial in vivo HPPH concentration is quantified via interstitial HPPH fluorescence measurements after correction for tissue optical properties. Light is delivered by a linear source at various light doses (12-50 J/cm) with powers ranging from 12 to 150 mW per cm length. The necrosis radius is quantified using ScanScope after tumor sectioning and hematoxylin and eosin (H&E) staining. The macroscopic optimization model is used to fit the results and generate four PDT parameters. Initial results of the parameters for H460 tumors will be reported and compared with those for the RIF tumor.
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Affiliation(s)
- Baochang Liu
- Department of Radiation Oncology, School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
| | - Michele M Kim
- Department of Radiation Oncology, School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
| | | | - Theresa M Busch
- Department of Radiation Oncology, School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
| | - Timothy C Zhu
- Department of Radiation Oncology, School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
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27
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Weston MA, Patterson MS. Measurement of intracellular oxygen concentration during photodynamic therapy in vitro. Photochem Photobiol 2014; 90:878-88. [PMID: 24521344 DOI: 10.1111/php.12256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2013] [Accepted: 01/29/2014] [Indexed: 11/28/2022]
Abstract
A technique is introduced that monitors the depletion of intracellular ground state oxygen concentration ([(3)O(2)]) during photodynamic therapy of Mat-LyLu cell monolayers and cell suspensions. The photosensitizer Pd(II) meso-tetra(4-carboxyphenyl)porphine (PdT790) is used to manipulate and indicate intracellular [(3)O(2)] in both of the in vitro models. The Stern-Volmer relationship for PdT790 phosphorescence was characterized in suspensions by flowing nitrogen over the suspension while short pulses of 405 nm light were used to excite the sensitizer. The bleaching of sensitizer and the oxygen consumption rate were also measured during continuous exposure of the cell suspension to the 405 nm laser. Photodynamic therapy (PDT) was conducted in both cell suspensions and in cell monolayers under different treatment conditions while the phosphorescence signal was acquired. The intracellular [(3)O(2)] during PDT was calculated by using the measured Stern-Volmer relationship and correcting for sensitizer photobleaching. In addition, the amount of oxygen that was consumed during the treatments was calculated. It was found that even at large oxygen consumption rates, cells remain well oxygenated during PDT of cell suspensions. For monolayer treatments, it was found that intracellular [(3)O(2)] is rapidly depleted over the course of PDT.
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Affiliation(s)
- Mark A Weston
- Juravinski Cancer Centre, Physics Research, Hamilton, ON, Canada; Department of Medical Physics and Applied Radiation Sciences, McMaster University, Hamilton, ON, Canada
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28
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Mallidi S, Anbil S, Lee S, Manstein D, Elrington S, Kositratna G, Schoenfeld D, Pogue B, Davis SJ, Hasan T. Photosensitizer fluorescence and singlet oxygen luminescence as dosimetric predictors of topical 5-aminolevulinic acid photodynamic therapy induced clinical erythema. JOURNAL OF BIOMEDICAL OPTICS 2014; 19:028001. [PMID: 24503639 PMCID: PMC3915169 DOI: 10.1117/1.jbo.19.2.028001] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2013] [Revised: 12/05/2013] [Accepted: 12/05/2013] [Indexed: 05/19/2023]
Abstract
The need for patient-specific photodynamic therapy (PDT) in dermatologic and oncologic applications has triggered several studies that explore the utility of surrogate parameters as predictive reporters of treatment outcome. Although photosensitizer (PS) fluorescence, a widely used parameter, can be viewed as emission from several fluorescent states of the PS (e.g., minimally aggregated and monomeric), we suggest that singlet oxygen luminescence (SOL) indicates only the active PS component responsible for the PDT. Here, the ability of discrete PS fluorescence-based metrics (absolute and percent PS photobleaching and PS re-accumulation post-PDT) to predict the clinical phototoxic response (erythema) resulting from 5-aminolevulinic acid PDT was compared with discrete SOL (DSOL)-based metrics (DSOL counts pre-PDT and change in DSOL counts pre/post-PDT) in healthy human skin. Receiver operating characteristic curve (ROC) analyses demonstrated that absolute fluorescence photobleaching metric (AFPM) exhibited the highest area under the curve (AUC) of all tested parameters, including DSOL based metrics. The combination of dose-metrics did not yield better AUC than AFPM alone. Although sophisticated real-time SOL measurements may improve the clinical utility of SOL-based dosimetry, discrete PS fluorescence-based metrics are easy to implement, and our results suggest that AFPM may sufficiently predict the PDT outcomes and identify treatment nonresponders with high specificity in clinical contexts.
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Affiliation(s)
- Srivalleesha Mallidi
- Massachusetts General Hospital, Wellman Center for Photomedicine, Boston, Massachusetts 02114
| | - Sriram Anbil
- Massachusetts General Hospital, Wellman Center for Photomedicine, Boston, Massachusetts 02114
| | - Seonkyung Lee
- Physical Sciences Inc., Andover, Massachusetts 01810
| | - Dieter Manstein
- Massachusetts General Hospital, Department of Dermatology, Boston, Massachusetts 02114
| | - Stefan Elrington
- Massachusetts General Hospital, Wellman Center for Photomedicine, Boston, Massachusetts 02114
| | - Garuna Kositratna
- Massachusetts General Hospital, Department of Dermatology, Boston, Massachusetts 02114
| | - David Schoenfeld
- Massachusetts General Hospital, Biostatistics Department, Boston, Massachusetts 02114
| | - Brian Pogue
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire 03755
| | | | - Tayyaba Hasan
- Massachusetts General Hospital, Wellman Center for Photomedicine, Boston, Massachusetts 02114
- Address all correspondence to: Tayyaba Hasan, E-mail:
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Weston MA, Patterson MS. Effect of1O2quencher depletion on the efficiency of photodynamic therapy. Photochem Photobiol Sci 2014; 13:112-21. [DOI: 10.1039/c3pp50258a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Weston MA, Patterson MS. Monitoring oxygen concentration during photodynamic therapy using prompt photosensitizer fluorescence. Phys Med Biol 2013; 58:7039-59. [PMID: 24051952 DOI: 10.1088/0031-9155/58/20/7039] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A novel technique is described that uses either time-resolved or steady state prompt photosensitizer fluorescence to measure local oxygen concentration. Solution experiments conducted with Al(III) phthalocyanine chloride tetrasulfonic acid confirmed that the steady state fluorescence signal is dependent on the oxygen concentration and fluence rate. A relationship between prompt sensitizer fluorescence and sensitizer triplet quenching efficiency is derived which does not require knowledge of the Stern-Volmer constant. Similar relationships are also derived for sensitizer delayed fluorescence and phosphorescence. An explicit photodynamic therapy (PDT) dose metric that incorporates light dosimetry, sensitizer dosimetry, and triplet quenching efficiency is introduced. All components of this metric can be determined by optical measurements.
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Affiliation(s)
- Mark A Weston
- Juravinski Cancer Centre, Physics Research, 699 Concession St., Hamilton, Ontario, L8V 5C2, Canada
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Allison RR, Moghissi K. Oncologic photodynamic therapy: clinical strategies that modulate mechanisms of action. Photodiagnosis Photodyn Ther 2013; 10:331-41. [PMID: 24284082 DOI: 10.1016/j.pdpdt.2013.03.011] [Citation(s) in RCA: 94] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Revised: 03/17/2013] [Accepted: 03/28/2013] [Indexed: 01/08/2023]
Abstract
Photodynamic therapy (PDT) is an elegant minimally invasive oncologic therapy. The clinical simplicity of photosensitizer (PS) drug application followed by appropriate illumination of target leading to the oxygen dependent tumor ablative Photodynamic Reaction (PDR) has gained this treatment worldwide acceptance. Yet the true potential of clinical PDT has not yet been achieved. This paper will review current mechanisms of action and treatment paradigms with critical commentary on means to potentially improve outcome using readily available clinical tools.
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Affiliation(s)
- Ron R Allison
- Medical Director 21st Century Oncology, 801 WH Smith Boulevard, Greenville, NC 27834, USA.
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Liu B, Kim MM, Zhu TC. A theoretical comparison of macroscopic and microscopic modeling of singlet oxygen during Photofrin and HPPH mediated-PDT. PROCEEDINGS OF SPIE--THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING 2013; 8568:856805. [PMID: 25999642 PMCID: PMC4437727 DOI: 10.1117/12.2002489] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Mathematic models were developed to simulate the complex dynamic process of photodynamic therapy (PDT). Macroscopic or microscopic modeling of singlet oxygen (1O2) is particularly of interest because it is the major cytotoxic agent causing biological effects during PDT. Our previously introduced macroscopic PDT model incorporates the diffusion equation for the light propagation in tissue and the macroscopic kinetic equations for the production of the 1O2. The distance-dependent distribution of 3O2 and reacted 1O2 can be numerically calculated using finite-element method (FEM). We recently improved the model to include microscopic kinetic equations of oxygen diffusion from uniformly distributed blood vessels and within tissue. In the model, the cylindrical blood capillary has radius in the range of 2-5 μm and a mean length of 300 μm, and supplies oxygen into tissue. The blood vessel network is assumed to form a 2-D square grid perpendicular to a linear light source. The spacing of the grid is 60 μm. Oxygen can also diffuse along the radius and the longitudinal axial of the cylinder within tissue. The oxygen depletion during Photofrin-PDT can be simulated using both macroscopic and microscopic approaches. The comparison of the simulation results have reasonable agreements when velocity of blood flow is reduced during PDT.
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Affiliation(s)
- Baochang Liu
- Department of Radiation Oncology, School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
| | - Michele M Kim
- Department of Radiation Oncology, School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
| | - Timothy C Zhu
- Department of Radiation Oncology, School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
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Valentine RM, Wood K, Brown CTA, Ibbotson SH, Moseley H. Monte Carlo simulations for optimal light delivery in photodynamic therapy of non-melanoma skin cancer. Phys Med Biol 2012; 57:6327-45. [DOI: 10.1088/0031-9155/57/20/6327] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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Klyta M, Ostasiewicz P, Jurczyszyn K, Duś K, Latos-Grażyński L, Pacholska-Dudziak E, Ziółkowski P. Vacata- and divacataporphyrin: new photosensitizers for application in photodynamic therapy-an in vitro study. Lasers Surg Med 2012; 43:607-13. [PMID: 22057488 DOI: 10.1002/lsm.21086] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
BACKGROUND AND OBJECTIVE The photodynamic therapy is a well-known method of treatment of both malignant tumors and non-tumor lesions in human patients. In the present study, we aimed at evaluating the in vitro efficacy of the new photosensitizing agents, vacataporphyrin (VP), and divacataporphyrin (DVP). MATERIALS AND METHODS The effectiveness of VP and DVP was compared to well-known photosensitizers, that is, hematoporphyrin derivative (HPD) and chlorin e6 (Ce6) in identical in vitro conditions. The experiment was performed on a well-established breast cancer cell line, MCF-7 and compared to HCV 29T11-2-D1 cell line. Cells were incubated in standard conditions and they were exposed to different concentrations of VP, DVP, HPD, and Ce6, that is, 180, 90, 45, 22.5, and 10 µg/ml. After incubation with photosensitizers, the cells were washed, medium was exchanged and the cells were subjected to irradiation at the proper wavelengths, light intensity (100 mW/sq cm), and total light doses 4.5 and 9 J/sq cm. RESULTS Our results showed that the VP and DVP are potent photosensitizers and the photocytotoxic effect after the incubation with DVP was much better than that of VP. The cytotoxic effects of VP and DVP were less intensive than these of HPD and Ce6. VP and DVP also accumulated well in the tumor cells. Our results also indicated that the VP and DVP effectiveness on MCF-7 cells was photosensitizer dose and light dose dependent. CONCLUSION The overall properties revealed by both new porphyrins and particularly a possibility for excitation at a higher wavelength and thus a deeper tissue penetration, make them promising candidates for further in vivo experiments.
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Affiliation(s)
- Magdalena Klyta
- Department of Pathology, Wroclaw Medical University, 50-368 Wroclaw, Poland
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Wang Y, Zuo Z, Gu Y, Huang N, Chen R, Li B, Qiu H, Zeng J, Zhu J, Liang J. New optional photodynamic therapy laser wavelength for infantile port wine stains: 457 nm. JOURNAL OF BIOMEDICAL OPTICS 2012; 17:068003. [PMID: 22734789 DOI: 10.1117/1.jbo.17.6.068003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
To expand the optional laser wavelengths of photodynamic therapy (PDT) for port wine stain (PWS), the feasibility of applying a 457 nm laser to the PDT for infantile PWS was analyzed by mathematical simulation and was validated by clinical experiment. Singlet oxygen yield of 457 nm PDT or 532 nm PDT in an infantile PWS model and an adult PWS model was theoretically simulated. Fifteen PWS patients (14 infants and 1 adult) with 40 spots were treated with 457 nm (20 spots) and 532 nm (20 spots), respectively, in two PDT courses. Simulation results showed that under the same power density and irradiation time, singlet oxygen yield of 457 nm PDT and 532 nm PDT are similar in infantile PWS vessels. Yet, in adult PWS vessels, singlet oxygen yield of 457 nm PDT is lower than 532 nm PDT. Clinical outcomes showed that no statistic difference existed between 457 nm PDT and 532 nm PDT for infantile PWS. The result of this study suggested that 457 nm wavelength laser has the potential to be applied in PDT for infantile PWS.
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Affiliation(s)
- Ying Wang
- Chinese People's Liberation Army General Hospital, Department of Laser Medicine, Beijing 100853, China
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Salas-García I, Fanjul-Vélez F, Arce-Diego JL. Photosensitizer absorption coefficient modeling and necrosis prediction during Photodynamic Therapy. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2012; 114:79-86. [PMID: 22704663 DOI: 10.1016/j.jphotobiol.2012.05.013] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2012] [Revised: 05/09/2012] [Accepted: 05/21/2012] [Indexed: 11/18/2022]
Abstract
The development of accurate predictive models for Photodynamic Therapy (PDT) has emerged as a valuable tool to adjust the current therapy dosimetry to get an optimal treatment response, and definitely to establish new personal protocols. Several attempts have been made in this way, although the influence of the photosensitizer depletion on the optical parameters has not been taken into account so far. We present a first approach to predict the spatio-temporal variation of the photosensitizer absorption coefficient during PDT applied to dermatological diseases, taking into account the photobleaching of a topical photosensitizer. This permits us to obtain the photons density absorbed by the photosensitizer molecules as the treatment progresses and to determine necrosis maps to estimate the short term therapeutic effects in the target tissue. The model presented also takes into account an inhomogeneous initial photosensitizer distribution, light propagation in biological media and the evolution of the molecular concentrations of different components involved in the photochemical reactions. The obtained results allow to investigate how the photosensitizer depletion during the photochemical reactions affects light absorption by the photosensitizer molecules as the optical radiation propagates through the target tissue, and estimate the necrotic tumor area progression under different treatment conditions.
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Affiliation(s)
- Irene Salas-García
- Applied Optical Techniques Group, TEISA Department, University of Cantabria, Av. de los Castros S/N, 39005 Santander, Spain
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Liu B, Farrell TJ, Patterson MS. Comparison of noninvasive photodynamic therapy dosimetry methods using a dynamic model of ALA-PDT of human skin. Phys Med Biol 2012; 57:825-41. [DOI: 10.1088/0031-9155/57/3/825] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Harris F, Pierpoint L. Photodynamic therapy based on 5-aminolevulinic acid and its use as an antimicrobial agent. Med Res Rev 2011; 32:1292-327. [PMID: 21793017 DOI: 10.1002/med.20251] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Exogenous 5-aminolevulinic acid (ALA) is taken up directly by bacteria, yeasts, fungi, and some parasites, which then induces the accumulation of protoporphyrin IX (PPIX). Subsequent light irradiation of PPIX leads to the inactivation of these organisms via photodamage to their cellular structures. ALA uptake and light irradiation of PPIX produced by host cells leads to the inactivation of other parasites, along with some viruses, via the induction of an immune response. ALA-mediated PPIX production by host cells and light irradiation result in the inactivation of other viruses via either the induction of a host cell response or direct photodynamic attack on viral particles. This ALA-mediated production of light-activated PPIX has been extensively used as a form of photodynamic therapy (PDT) and has shown varying levels of efficacy in treating conditions that are associated with microbial infection, ranging from acne and verrucae to leishmaniasis and onychomycosis. However, for the treatment of some of these conditions by ALA-based PDT, the role of an antimicrobial effect has been disputed and in general, the mechanisms by which the technique inactivates microbes are not well understood. In this study, we review current understanding of the antimicrobial mechanisms used by ALA-based PDT and its role in the treatment of microbial infections along with its potential medical and nonmedical applications.
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Affiliation(s)
- Frederick Harris
- School of Forensic and Investigative Sciences, University of Central Lancashire, Preston, Lancashire, United Kingdom. fharris1@.ac.uk
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Naghavi N, Miranbaygi MH, Sazgarnia A. Simulation of fractionated and continuous irradiation in photodynamic therapy: study the differences between photobleaching and singlet oxygen dose deposition. AUSTRALASIAN PHYSICAL & ENGINEERING SCIENCES IN MEDICINE 2011; 34:203-11. [DOI: 10.1007/s13246-011-0064-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2010] [Accepted: 03/08/2011] [Indexed: 11/24/2022]
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