1
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Wu Y, Xie L, Liu Y, Xie L. Model Agnostic Semi-Supervised Meta-Learning Elucidates Understudied Out-of-distribution Molecular Interactions. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2023.05.17.541172. [PMID: 37292680 PMCID: PMC10245663 DOI: 10.1101/2023.05.17.541172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Many biological problems are understudied due to experimental limitations and human biases. Although deep learning is promising in accelerating scientific discovery, its power compromises when applied to problems with scarcely labeled data and data distribution shifts. We developed a semi-supervised meta learning framework - Meta Model Agnostic Pseudo Label Learning (MMAPLE) - to address these challenges by effectively exploring out-of-distribution (OOD) unlabeled data when transfer learning fails. The power of MMAPLE is demonstrated in multiple applications: predicting OOD drug-target interactions, hidden human metabolite-enzyme interactions, and understudied interspecies microbiome metabolite-human receptor interactions, where chemicals or proteins in unseen data are dramatically different from those in training data. MMAPLE achieves 11% to 242% improvement in the prediction-recall on multiple OOD benchmarks over baseline models. Using MMAPLE, we reveal novel interspecies metabolite-protein interactions that are validated by bioactivity assays and fill in missing links in microbiome-human interactions. MMAPLE is a general framework to explore previously unrecognized biological domains beyond the reach of present experimental and computational techniques.
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Affiliation(s)
- You Wu
- Ph.D. Program in Computer Science, The Graduate Center, The City University of New York, New York, New York, USA
| | - Li Xie
- Department of Computer Science, Hunter College, The City University of New York, New York, New York, USA
| | - Yang Liu
- Department of Computer Science, Hunter College, The City University of New York, New York, New York, USA
| | - Lei Xie
- Ph.D. Program in Computer Science, The Graduate Center, The City University of New York, New York, New York, USA
- Department of Computer Science, Hunter College, The City University of New York, New York, New York, USA
- Helen & Robert Appel Alzheimer’s Disease Research Institute, Feil Family Brain & Mind Research Institute, Weill Cornell Medicine, Cornell University, New York, New York, USA
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2
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Cao N, Jiang Y, Song ZB, Chen D, Wu D, Chen ZL, Yan YJ. Synthesis and evaluation of novel meso-substitutedphenyl dithieno[3,2-b]thiophene-fused BODIPY derivatives as efficient photosensitizers for photodynamic therapy. Eur J Med Chem 2024; 264:116012. [PMID: 38056302 DOI: 10.1016/j.ejmech.2023.116012] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 11/25/2023] [Accepted: 11/26/2023] [Indexed: 12/08/2023]
Abstract
The discovery of new photosensitizer drugs with long wavelength Uv-vis absorption, high efficiency and low side-effects is still a challenge in photodynamic therapy. Here a series of novel meso-substitutedphenyl thieno[3,2-b]thiophene-fused BODIPY derivatives were designed, synthesized and characterized. All these compounds have strong absorption at 640-680 nm and obvious fluorescence emission at 650-760 nm. They exhibited high singlet oxygen generation ability and significant photodynamic efficiency against Eca-109 cancer cells. Compounds II4, II6, II9, II10 and II13 could generate intracellular ROS and induce cell apoptosis after laser irradiation, which displayed superior photodynamic efficiency against Eca-109 cells than Temoporfin in vitro and in vivo. Among them, compound II4 specifically exhibited excellent anti-tumor efficacy, and could be selected as a new drug candidate for PDT.
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Affiliation(s)
- Ning Cao
- Department of Pharmaceutical Science & Technology, Donghua University, Shanghai, 201620, China
| | - Ying Jiang
- Department of Pharmaceutical Science & Technology, Donghua University, Shanghai, 201620, China
| | - Zhi-Bing Song
- Department of Pharmaceutical Science & Technology, Donghua University, Shanghai, 201620, China
| | - Danye Chen
- Department of Chemistry, Imperial College of London, London, SW72AZ, UK
| | - Dan Wu
- Department of Chemistry, Royal College of Surgeons, 123 St Stephen's Green, Dublin, 2, Ireland
| | - Zhi-Long Chen
- Department of Pharmaceutical Science & Technology, Donghua University, Shanghai, 201620, China; Department of Pharmacy, Huadong Hospital, Fudan University, Shanghai, 200040, China.
| | - Yi-Jia Yan
- Department of Pharmacy, Huadong Hospital, Fudan University, Shanghai, 200040, China; Shanghai Xianhui Pharmaceutical Co., Ltd., Shanghai, 201620, China.
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3
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Sateesha K, Mahesha, Pasha M, Patil MB, Vetrivelan V, Saral A, Muthu S, Javed S, Lokanath N, Amshumali M. Synthesis, structural and theoretical investigations on 3-diethyl 2-({4-[3-ethoxy-2-(ethoxycarbonyl)-3-oxo-2-phenylpropyl]-2,5-dimethylphenyl}methyl)-2-phenylpropanedioate. J INDIAN CHEM SOC 2022. [DOI: 10.1016/j.jics.2022.100869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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4
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Zhang C, Zhao X, Li D, Ji F, Dong A, Chen X, Zhang J, Wang X, Zhao Y, Chen X. Advances in 5-aminoketovaleric acid(5-ALA) nanoparticle delivery system based on cancer photodynamic therapy. J Drug Deliv Sci Technol 2022. [DOI: 10.1016/j.jddst.2022.103933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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5
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Li K, Dong W, Qiu L, Liu Q, Lv G, Peng Y, Xie M, Lin J. A new GSH-responsive prodrug of 5-aminolevulinic acid for photodiagnosis and photodynamic therapy of tumors. Eur J Med Chem 2019; 181:111582. [PMID: 31398615 DOI: 10.1016/j.ejmech.2019.111582] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 07/30/2019] [Accepted: 07/31/2019] [Indexed: 10/26/2022]
Abstract
5-Aminolevulinic acid (5-ALA) and its two ester derivatives (5-ALA-OMe and 5-ALA-OHex) have been approved for photodiagnosis and photodynamic therapy (PDT) of tumors in the clinical. However, their pharmacological activities are limited by their instability under physiological conditions and lack of tumor selectivity. With the aim to overcome these shortcomings, a glutathione-responsive 5-ALA derivative (SA) was designed based on the fact that many types of tumor cells have higher intracellular glutathione level than normal cells. SA was synthesized by masking the 5-amion group of 5-ALA methyl ester (5-ALA-OMe) with a self-immolative disulfide linker. Compared with 5-ALA and 5-ALA-OMe, SA exhibited higher stability under physiological conditions, and it can efficiently release the parent compound 5-ALA-OMe in response to glutathione. In tumor cells, SA displayed excellent protoporphyrin IX (PpIX) production activity at low concentrations while 5-ALA and 5-ALA-OMe were ineffective at the same concentration. The SA-induced PpIX production was positively correlated with the intracellular glutathione level, and SA exhibited enhanced phototoxicity due to its excellent PpIX generation activity. This study indicates that modification of the amino group in 5-ALA derivatives with a self-immolative disulfide linker is an effective strategy to improve their chemical stability and pharmacological activities, and SA is a potential photosensitizer for photodiagnosis and PDT of tumors.
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Affiliation(s)
- Ke Li
- Key Laboratory of Nuclear Medicine, Ministry of Health, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi, 214063, PR China; The First Affiliated Hospital of Nanjing Medical University, Nanjing Medical University, Nanjing, 210029, PR China
| | - Wenyi Dong
- Key Laboratory of Nuclear Medicine, Ministry of Health, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi, 214063, PR China; School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, PR China
| | - Ling Qiu
- Key Laboratory of Nuclear Medicine, Ministry of Health, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi, 214063, PR China
| | - Qingzhu Liu
- Key Laboratory of Nuclear Medicine, Ministry of Health, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi, 214063, PR China
| | - Gaochao Lv
- Key Laboratory of Nuclear Medicine, Ministry of Health, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi, 214063, PR China
| | - Ying Peng
- Key Laboratory of Nuclear Medicine, Ministry of Health, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi, 214063, PR China
| | - Minhao Xie
- Key Laboratory of Nuclear Medicine, Ministry of Health, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi, 214063, PR China; The First Affiliated Hospital of Nanjing Medical University, Nanjing Medical University, Nanjing, 210029, PR China.
| | - Jianguo Lin
- Key Laboratory of Nuclear Medicine, Ministry of Health, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi, 214063, PR China.
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6
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Oseghale AR, Zhu X, Li B, Peterson KR, Nudelman A, Rephaeli A, Xu H, Pace BS. Conjugate prodrug AN-233 induces fetal hemoglobin expression in sickle erythroid progenitors and β-YAC transgenic mice. Blood Cells Mol Dis 2019; 79:102345. [PMID: 31351219 DOI: 10.1016/j.bcmd.2019.102345] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Accepted: 07/08/2019] [Indexed: 12/24/2022]
Abstract
Pharmacologic induction of fetal hemoglobin (HbF) is an effective strategy for treating sickle cell disease (SCD) by ameliorating disease severity. Hydroxyurea is the only FDA-approved agent that induces HbF, but significant non-responders and requirement for frequent monitoring of blood counts for drug toxicity limit clinical usefulness. Therefore, we investigated a novel prodrug conjugate of butyric acid (BA) and δ-aminolevulinate (ALA) as a potential HbF inducing agent, using erythroid precursors and a preclinical β-YAC mouse model. We observed significantly increased γ-globin gene transcription and HbF expression mediated by AN-233 in K562 cells. Moreover, AN-233 stimulated mild heme biosynthesis and inhibited expression of heme-regulated eIF2α kinase involved in silencing γ-globin expression. Studies using primary erythroid precursors generated from sickle peripheral blood mononuclear cells verified the ability of AN-233 to induce HbF, increase histone H3 and H4 acetylation levels at the γ-globin promoter and reduce erythroid precursor sickling by 50%. Subsequent drug treatment of β-YAC transgenic mice confirmed HbF induction in vivo by AN-233 through an increase in the percentage of HbF positive red blood cells and HbF levels measured by flow cytometry. These data support the potential development of AN-233 for the treatment of SCD.
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Affiliation(s)
| | - Xingguo Zhu
- Department of Pediatrics, Augusta University, Augusta, GA, USA
| | - Biaoru Li
- Department of Pediatrics, Augusta University, Augusta, GA, USA
| | - Kenneth R Peterson
- Department of Biochemistry and Molecular Biology, University of Kansas Medical Center, Kansas City, KS, USA
| | | | - Ada Rephaeli
- Felsenstein Medical Research Center, Sackler Medical School, Tel Aviv University, Petach Tikva, Israel
| | - Hongyan Xu
- Department of Population Health Sciences, Augusta University, Augusta, GA, USA
| | - Betty S Pace
- Vascular Biology Center, Augusta University, Augusta, GA, USA; Department of Pediatrics, Augusta University, Augusta, GA, USA; Department of Biochemistry and Molecular Biology, Augusta University, Augusta, GA, USA.
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7
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Babič A, Herceg V, Bastien E, Lassalle HP, Bezdetnaya L, Lange N. 5-Aminolevulinic Acid-Squalene Nanoassemblies for Tumor Photodetection and Therapy: In Vitro Studies. NANOSCALE RESEARCH LETTERS 2018; 13:10. [PMID: 29327259 PMCID: PMC5764903 DOI: 10.1186/s11671-017-2408-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Accepted: 12/10/2017] [Indexed: 05/22/2023]
Abstract
Protoporphyrin IX (PpIX) as natural photosensitizer derived from administration of 5-aminolevulinic acid (5-ALA) has found clinical use for photodiagnosis and photodynamic therapy of several cancers. However, broader use of 5-ALA in oncology is hampered by its charge and polarity that result in its reduced capacity for passing biological barriers and reaching the tumor tissue. Advanced drug delivery platforms are needed to improve the biodistribution of 5-ALA. Here, we report a new approach for the delivery of 5-ALA. Squalenoylation strategy was used to covalently conjugate 5-ALA to squalene, a natural precursor of cholesterol. 5-ALA-SQ nanoassemblies were formed by self-assembly in water. The nanoassemblies were monodisperse with average size of 70 nm, polydispersity index of 0.12, and ζ-potential of + 36 mV. They showed good stability over several weeks. The drug loading of 5-ALA was very high at 26%. In human prostate cancer cells PC3 and human glioblastoma cells U87MG, PpIX production was monitored in vitro upon the incubation with nanoassemblies. They were more efficient in generating PpIX-induced fluorescence in cancer cells compared to 5-ALA-Hex at 1.0 to 3.3 mM at short and long incubation times. Compared to 5-ALA, they showed superior fluorescence performance at 4 h which was diminished at 24 h. 5-ALA-SQ presents a novel nano-delivery platform with great potential for the systemic administration of 5-ALA.
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Affiliation(s)
- Andrej Babič
- School of Pharmaceutical Sciences, University of Geneva, Rue Michel Servet 1, 1211, Geneva 4, Switzerland.
- School of Pharmaceutical Sciences, University of Lausanne, Lausanne, Switzerland.
| | - V Herceg
- School of Pharmaceutical Sciences, University of Geneva, Rue Michel Servet 1, 1211, Geneva 4, Switzerland
- School of Pharmaceutical Sciences, University of Lausanne, Lausanne, Switzerland
| | - E Bastien
- Centre de Recherche en Automatique de Nancy (CRAN), CNRS UMR 7039 (Centre National de la Recherche Scientifique), Université de Lorraine, Campus Sciences, Vandœuvre-lès-Nancy, France
- Research Department, Institut de Cancérologie de Lorraine, Avenue de Bourgogne, 54519, Vandœuvre-lès-Nancy, France
| | - H-P Lassalle
- Centre de Recherche en Automatique de Nancy (CRAN), CNRS UMR 7039 (Centre National de la Recherche Scientifique), Université de Lorraine, Campus Sciences, Vandœuvre-lès-Nancy, France
- Research Department, Institut de Cancérologie de Lorraine, Avenue de Bourgogne, 54519, Vandœuvre-lès-Nancy, France
| | - L Bezdetnaya
- Centre de Recherche en Automatique de Nancy (CRAN), CNRS UMR 7039 (Centre National de la Recherche Scientifique), Université de Lorraine, Campus Sciences, Vandœuvre-lès-Nancy, France
- Research Department, Institut de Cancérologie de Lorraine, Avenue de Bourgogne, 54519, Vandœuvre-lès-Nancy, France
| | - Norbert Lange
- School of Pharmaceutical Sciences, University of Geneva, Rue Michel Servet 1, 1211, Geneva 4, Switzerland.
- School of Pharmaceutical Sciences, University of Lausanne, Lausanne, Switzerland.
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8
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Tewari KM, Eggleston IM. Chemical approaches for the enhancement of 5-aminolevulinic acid-based photodynamic therapy and photodiagnosis. Photochem Photobiol Sci 2018; 17:1553-1572. [DOI: 10.1039/c8pp00362a] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The development of photodynamic therapy and photodiagnosis with 5-aminolevulinic acid presents a number of challenges that can be addressed by applying chemical insight and a range of novel prodrug strategies.
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Affiliation(s)
- Kunal M. Tewari
- Department of Pharmacy and Pharmacology
- University of Bath
- Bath BA2 7AY
- UK
| | - Ian M. Eggleston
- Department of Pharmacy and Pharmacology
- University of Bath
- Bath BA2 7AY
- UK
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9
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Activity of phosphatase-sensitive 5-aminolevulinic acid prodrugs in cancer cell lines. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2017; 171:34-42. [DOI: 10.1016/j.jphotobiol.2017.04.029] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Revised: 03/19/2017] [Accepted: 04/24/2017] [Indexed: 11/22/2022]
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10
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Liu JN, Bu W, Shi J. Chemical Design and Synthesis of Functionalized Probes for Imaging and Treating Tumor Hypoxia. Chem Rev 2017; 117:6160-6224. [DOI: 10.1021/acs.chemrev.6b00525] [Citation(s) in RCA: 556] [Impact Index Per Article: 79.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Jia-nan Liu
- State
Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P.R. China
| | - Wenbo Bu
- State
Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P.R. China
- Shanghai
Key Laboratory of Green Chemistry and Chemical Processes, School of
Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, P.R. China
| | - Jianlin Shi
- State
Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P.R. China
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11
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Battah S, Hider RC, MacRobert AJ, Dobbin PS, Zhou T. Hydroxypyridinone and 5-Aminolaevulinic Acid Conjugates for Photodynamic Therapy. J Med Chem 2017; 60:3498-3510. [DOI: 10.1021/acs.jmedchem.7b00346] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sinan Battah
- School
of Biological Sciences, University of Essex, Colchester CO4 3SQ, U.K
- Division
of Surgery and Interventional Science, University College London, Charles
Bell House, 67-73 Riding House Street, London W1W 7JE, U.K
| | - Robert C. Hider
- Division
of Pharmaceutical Sciences, King’s College London, 150 Stamford
Street, London SE1 9NH, U.K
| | - Alexander J. MacRobert
- Division
of Surgery and Interventional Science, University College London, Charles
Bell House, 67-73 Riding House Street, London W1W 7JE, U.K
| | - Paul S. Dobbin
- School
of Biological Sciences, University of Essex, Colchester CO4 3SQ, U.K
| | - Tao Zhou
- School
of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, Zhejiang 310018, P. R. China
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12
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Zhu W, Gao YH, Song CH, Lu ZB, Namulinda T, Han YP, Yan YJ, Wang LX, Chen ZL. Synthesis and evaluation of new 5-aminolevulinic acid derivatives as prodrugs of protoporphyrin for photodynamic therapy. Photochem Photobiol Sci 2017; 16:1623-1630. [PMID: 28933502 DOI: 10.1039/c7pp00203c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Upon light activation, 13a can induce the production of PpIX in vivo which produces ROS and other reactive oxygen species to lead to the apoptosis of S180 cell tumors.
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Affiliation(s)
- Wei Zhu
- Department of Pharmaceutical Science & Technology
- College of Chemistry and Biology
- Donghua University
- Shanghai 201620
- China
| | - Ying-Hua Gao
- Department of Pharmaceutical Science & Technology
- College of Chemistry and Biology
- Donghua University
- Shanghai 201620
- China
| | - Chun-Hong Song
- Department of Pharmaceutical Science & Technology
- College of Chemistry and Biology
- Donghua University
- Shanghai 201620
- China
| | - Zhi-Bin Lu
- Department of Pharmaceutical Science & Technology
- College of Chemistry and Biology
- Donghua University
- Shanghai 201620
- China
| | - Tabbisa Namulinda
- Department of Pharmaceutical Science & Technology
- College of Chemistry and Biology
- Donghua University
- Shanghai 201620
- China
| | | | - Yi-Jia Yan
- Shanghai Xianhui Pharmaceutical Co. Ltd
- Shanghai 200433
- China
| | | | - Zhi-Long Chen
- Department of Pharmaceutical Science & Technology
- College of Chemistry and Biology
- Donghua University
- Shanghai 201620
- China
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13
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Soares AMS, Hungerford G, Gonçalves MST, Costa SPG. Light triggering of 5-aminolevulinic acid from fused coumarin ester cages. NEW J CHEM 2017. [DOI: 10.1039/c6nj03787a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Light-triggered release of 5-aminolevulinic acid from various fused coumarin ester cages under UV/vis irradiation in MeOH/HEPES buffer (80 : 20).
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Affiliation(s)
- Ana M. S. Soares
- Centro de Química
- Universidade do Minho
- Campus de Gualtar
- 4710-057 Braga
- Portugal
| | | | | | - Susana P. G. Costa
- Centro de Química
- Universidade do Minho
- Campus de Gualtar
- 4710-057 Braga
- Portugal
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14
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Wu J, Lin Y, Li H, Jin Q, Ji J. Zwitterionic stealth peptide-capped 5-aminolevulinic acid prodrug nanoparticles for targeted photodynamic therapy. J Colloid Interface Sci 2016; 485:251-259. [PMID: 27676086 DOI: 10.1016/j.jcis.2016.09.012] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Revised: 09/06/2016] [Accepted: 09/07/2016] [Indexed: 12/12/2022]
Abstract
5-Aminolevulinic acid (ALA) is a FDA-approved photodynamic therapy (PDT) precursor of protoporphyrin IX (PpIX) used for treating various cancers. However, the internalization of ALA is a big challenge due to its hydrophilic nature and low specificity to cancer cells. In this work, ALA conjugated prodrug nanoparticles were prepared by conjugation of thiolated stealth peptide sequence CPPPPEKEKEKEKEKEDGR and hydrazone-containing ALA to gold nanoparticles (AuNPs). Remarkable anti-fouling ability of ALA prodrug nanoparticles in complex environment was achieved owing to the zwitterionic stealth peptide sequence EKEKEKEKEK. The release of ALA could be greatly accelerated upon incubation of ALA prodrug nanoparticles in lysosomal/endosomal pH (pH 5.5). Meanwhile, the cellular internalization could be greatly enhanced by RGD moieties. MTT results demonstrated that ALA prodrug nanoparticles exhibited better photodynamic cytotoxicity than free ALA after light irradiation, suggesting enhanced photodynamic therapeutic efficacy.
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Affiliation(s)
- Jina Wu
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Ye Lin
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Huan Li
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Qiao Jin
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China.
| | - Jian Ji
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
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15
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Rephaeli A, Tarasenko N, Fibach E, Rozic G, Lubin I, Lipovetsky J, Furman S, Malik Z, Nudelman A. Bi-functional prodrugs of 5-aminolevulinic acid and butyric acid increase erythropoiesis in anemic mice in an erythropoietin-independent manner. Eur J Pharm Sci 2016; 91:91-7. [DOI: 10.1016/j.ejps.2016.06.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Revised: 05/09/2016] [Accepted: 06/04/2016] [Indexed: 11/28/2022]
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16
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Dwivedi AD, Gupta K, Tyagi D, Rai RK, Mobin SM, Singh SK. Ruthenium and Formic Acid Based Tandem Catalytic Transformation of Bioderived Furans to Levulinic Acid and Diketones in Water. ChemCatChem 2015. [DOI: 10.1002/cctc.201501021] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Ambikesh D. Dwivedi
- Discipline of Chemistry, School of Basic Sciences; Indian Institute of Technology (IIT) Indore; Indore 452 017 Madhya Pradesh India
| | - Kavita Gupta
- Discipline of Chemistry, School of Basic Sciences; Indian Institute of Technology (IIT) Indore; Indore 452 017 Madhya Pradesh India
| | - Deepika Tyagi
- Discipline of Chemistry, School of Basic Sciences; Indian Institute of Technology (IIT) Indore; Indore 452 017 Madhya Pradesh India
| | - Rohit K. Rai
- Discipline of Chemistry, School of Basic Sciences; Indian Institute of Technology (IIT) Indore; Indore 452 017 Madhya Pradesh India
| | - Shaikh M. Mobin
- Discipline of Chemistry, School of Basic Sciences; Indian Institute of Technology (IIT) Indore; Indore 452 017 Madhya Pradesh India
| | - Sanjay K. Singh
- Discipline of Chemistry, School of Basic Sciences; Indian Institute of Technology (IIT) Indore; Indore 452 017 Madhya Pradesh India
- Centre for Material Science and Engineering; Indian Institute of Technology (IIT) Indore; Indore 452 017 Madhya Pradesh India
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17
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Malik Z. Pros, cons and future prospects of ALA-photodiagnosis, phototherapy and pharmacology in cancer therapy – A mini review. ACTA ACUST UNITED AC 2015. [DOI: 10.1515/plm-2014-0036] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract5-Aminolevulinic acid (ALA)-induced photodynamic therapy (ALA-PDT) has achieved remarkable research accomplishments over the past 30 years, yet its application in medical oncology still awaits clear recognition as a valid alternative therapeutic modality. It is well documented that topical ALA-PDT enables the treatment of multiple skin lesions simultaneously, and provides excellent cosmetic results with no acquired multi-drug resistance (MDR). Furthermore, upon disease recurrence the treatment can be repeated resulting in the same therapeutic efficacy. Additionally, in oncological surgery, ALA fluorescence-guided resection is a practical and simple method for visualizing intra-operative brain and urological tumors with millimeter accuracy. The urgent challenge is to direct future research of ALA-phototherapy and fluorescence diagnosis to the maturation of their medical status in oncology. Therefore, the future objectives are to amplify critical evidence-based results of ALA-PDT safety and efficacy and to validate its unique advantages over other technologies. Strong statistical PDT documentation and the positive predictive values of protoporphyrin IX (PpIX)-guided surgery will persuade the medical community to implement ALA-based therapeutics into standard clinical and surgical oncology practice. Research must address the phenomenon that no MDR develops as a consequence of PDT, since MDR is the major stumbling block in oncological therapeutics. A feasible goal should be to improve ALA administration protocols based on recent knowledge that preactivation of the enzyme porphobilinogen deaminase enhances PpIX accumulation in cancer cells and photodestruction. Moreover the recent introduction of multifunctional ALA prodrugs that maximize photosensitizer biosynthesis, targeting multiple sub-cellular targets, may increase PDT anti-cancer efficacy in additional disease settings. In conclusion, well-documented clinical results, new ALA delivery protocols, and novel multifunctional ALA prodrugs may advance ALA-PDT to becoming a front-line cancer therapy.
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Guan M, Qin T, Ge J, Zhen M, Xu W, Chen D, Li S, Wang C, Su H, Shu C. Amphiphilic trismethylpyridylporphyrin-fullerene (C70) dyad: an efficient photosensitizer under hypoxia conditions. J Mater Chem B 2015; 3:776-783. [DOI: 10.1039/c4tb01314j] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Amphiphilic trismethylpyridylporphyrin-C70(PC70) dyad with improved photosensitization has been successfully prepared.
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Lou JW, Zhu L, Wu MB, Yang LR, Lin JP, Cen PL. High-level soluble expression of the hemA gene from Rhodobacter capsulatus and comparative study of its enzymatic properties. J Zhejiang Univ Sci B 2014; 15:491-9. [PMID: 24793767 PMCID: PMC4076606 DOI: 10.1631/jzus.b1300283] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2013] [Accepted: 03/26/2014] [Indexed: 11/11/2022]
Abstract
The Rhodobacter capsulatus hemA gene, which encodes 5-aminolevulinic acid synthase (ALAS), was expressed in Escherichia coli Rosetta (DE3) and the enzymatic properties of the purified recombinant ALAS (RC-ALAS) were studied. Compared with ALASs encoded by hemA genes from Agrobacterium radiobacter (AR-ALAS) and Rhodobacter sphaeroides (RS-ALAS), the specific activity of RC-ALAS reached 198.2 U/mg, which was about 31.2% and 69.5% higher than those of AR-ALAS (151.1 U/mg) and RS-ALAS (116.9 U/mg), respectively. The optimum pH values and temperatures of the three above mentioned enzymes were all pH 7.5 and 37 °C, respectively. Moreover, RC-ALAS was more sensitive to pH, while the other two were sensitive to temperature. The effects of metals, ethylene diamine tetraacetic acid (EDTA), and sodium dodecyl sulfate (SDS) on the three ALASs were also investigated. The results indicate that they had the same effects on the activities of the three ALASs. SDS and metal ions such as Co(2+), Zn(2+), and Cu(2+) strongly inhibited the activities of the ALASs, while Mn(2+) exerted slight inhibition, and K(+), Ca(2+), Ba(2+), Mg(2+), or EDTA had no significant effect. The specificity constant of succinyl coenzyme A [(kcat/Km)(S-CoA)] of RC-ALAS was 1.4989, which was higher than those of AR-ALAS (0.7456) and RS-ALAS (1.1699), showing its high catalytic efficiency. The fed-batch fermentation was conducted using the recombinant strain containing the R. capsulatus hemA gene, and the yield of 5-aminolevulinic acid (ALA) achieved was 8.8 g/L (67 mmol/L) under the appropriate conditions.
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Xu H, Liu C, Mei J, Yao C, Wang S, Wang J, Li Z, Zhang Z. Effects of light irradiation upon photodynamic therapy based on 5-aminolevulinic acid-gold nanoparticle conjugates in K562 cells via singlet oxygen generation. Int J Nanomedicine 2012; 7:5029-38. [PMID: 23055721 PMCID: PMC3457679 DOI: 10.2147/ijn.s33261] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
PURPOSE As a precursor of the potent photosensitizer protoporphyrin IX (PpIX), 5-aminolevulinic acid (5-ALA), was conjugated onto cationic gold nanoparticles (GNPs) to improve the efficacy of photodynamic therapy (PDT). METHODS Cationic GNPs reduced by branched polyethyleneimine and 5-ALA were conjugated onto the cationic GNPs by creating an electrostatic interaction at physiological pH. The efficacy of ALA-GNP conjugates in PDT was investigated under irradiation with a mercury lamp (central wavelength of 395 nm) and three types of light-emitting diode arrays (central wavelengths of 399, 502, and 621 nm, respectively). The impacts of GNPs on PDT were then analyzed by measuring the intracellular PpIX levels in K562 cells and the singlet oxygen yield of PpIX under irradiation. RESULTS The 2 mM ALA-GNP conjugates showed greater cytotoxicity against K562 cells than ALA alone. Light-emitting diode (505 nm) irradiation of the conjugates caused a level of K562 cell destruction similar to that with irradiation by a mercury lamp, although it had no adverse effects on drug-free control cells. These results may be attributed to the singlet oxygen yield of PpIX, which can be enhanced by GNPs. CONCLUSION Under irradiation with a suitable light source, ALA-GNP conjugates can effectively destroy K562 cells. The technique offers a new strategy of PDT.
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Affiliation(s)
- Hao Xu
- Key Laboratory of Biomedical Information Engineering of Education Ministry, Institute of Biomedical Analytical Technology and Instrumentation, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shannxi, People's Republic of China
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Berkovitch-Luria G, Yakobovitch S, Weitman M, Nudelman A, Rozic G, Rephaeli A, Malik Z. A multifunctional 5-aminolevulinic acid derivative induces erythroid differentiation of K562 human erythroleukemic cells. Eur J Pharm Sci 2012; 47:206-14. [DOI: 10.1016/j.ejps.2012.05.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2012] [Revised: 05/30/2012] [Accepted: 05/31/2012] [Indexed: 01/05/2023]
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Soares AMS, Piloto AM, Hungerford G, Costa SPG, Gonçalves MST. Photolytic Release of Butyric Acid from Oxygen- and Nitrogen-Based Heteroaromatic Cages. European J Org Chem 2011. [DOI: 10.1002/ejoc.201101392] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Feuerstein T, Berkovitch-Luria G, Nudelman A, Rephaeli A, Malik Z. Modulating ALA-PDT efficacy of mutlidrug resistant MCF-7 breast cancer cells using ALA prodrug. Photochem Photobiol Sci 2011; 10:1926-33. [PMID: 22020364 DOI: 10.1039/c1pp05205e] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Multi-drug resistance of breast cancer is a major obstacle in chemotherapy of cancer treatments. Recently it was suggested that photodynamic therapy (PDT) can overcome drug resistance of tumors. ALA-PDT is based on the administration of 5-aminolevulinic acid (ALA), the natural precursor for the PpIX biosynthesis, which is a potent natural photosensitizer. In the present study we used the AlaAcBu, a multifunctional ALA-prodrug for photodynamic inactivation of drug resistant MCF-7/DOX breast cancer cells. Supplementation of low doses (0.2mM) of AlaAcBu to the cells significantly increased accumulation of PpIX in both MCF-7/WT and MCF-7/DOX cells in comparison to ALA, or ALA + butyric acid (BA). In addition, our results show that MCF-7/DOX cells are capable of producing higher levels of porphyrins than MCF-7/WT cells due to low expression of the enzyme ferrochelatase, which inserts iron into the tetra-pyrrol ring to form the end product heme. Light irradiation of the AlaAcBu treated cells activated efficient photodynamic killing of MCF-7/DOX cells similar to the parent MCF-7/WT cells, depicted by low mitochondrial enzymatic activity, LDH leakage and decreased cell survival following PDT. These results indicate that the pro-drug AlaAcBu is an effective ALA derivative for PDT treatments of multidrug resistant tumors.
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Affiliation(s)
- Tamar Feuerstein
- The Mina & Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Microscopy Unit, Ramat-Gan, Israel
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Schauder A, Feuerstein T, Malik Z. The centrality of PBGD expression levels on ALA-PDT efficacy. Photochem Photobiol Sci 2011; 10:1310-7. [PMID: 21655622 DOI: 10.1039/c1pp05085k] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Successful 5-aminolevulinic acid-based photodynamic therapy (ALA-PDT) is dependent on efficient porphyrin synthesis in the inflicted cancer tissue, which is regulated by several enzymes. Irradiation of the tumor excites the light-sensitive porphyrins and results in ROS production and cell death. In this study we investigated the effect of the expression levels of two main enzymes in heme biosynthesis, ALA dehydratase (ALAD) and porphobilinogen deaminase (PBGD), on the capacity of K562 cells to undergo cell death following ALA-PDT. We manipulated PBGD and ALAD expression levels by shRNAs and PBGD overexpressing plasmid. PBGD down-regulation induced an elevation in ALAD activity, while overexpression of PBGD reduced ALAD activity, indicating a novel regulation feedback of PBGD on ALAD activity. This feedback mechanism enabled partial PpIX synthesis under PBGD silencing, whereas ALAD silencing reduced PpIX production to a minimum. ALA-PDT efficacy was directly correlated to PpIX levels. Thus, only ALAD-silenced cells were not affected by ALA+ irradiation, while following PBGD silencing, the accumulated PpIX, though decreased, was sufficient for successful ALA-PDT. The alterations in ALAD activity level initiated by changes in PBGD expression indicates PBGD's central role in heme synthesis. This enables efficient ALA-PDT, even when PBGD is not fully active. Conversely, ALAD loss resulted in reduced PpIX synthesis and consequently failure in ALA-PDT, due to the absence of compensation mechanism for ALAD.
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Affiliation(s)
- Avital Schauder
- Microscopy Unit, Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan, 52900, Israel.
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25
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Multifunctional 5-aminolevulinic acid prodrugs activating diverse cell-death pathways. Invest New Drugs 2011; 30:1028-38. [DOI: 10.1007/s10637-011-9669-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2011] [Accepted: 04/04/2011] [Indexed: 10/18/2022]
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Tyrrell J, Campbell SM, Curnow A. Monitoring the accumulation and dissipation of the photosensitizer protoporphyrin IX during standard dermatological methyl-aminolevulinate photodynamic therapy utilizing non-invasive fluorescence imaging and quantification. Photodiagnosis Photodyn Ther 2010; 8:30-8. [PMID: 21333932 DOI: 10.1016/j.pdpdt.2010.11.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2010] [Revised: 11/06/2010] [Accepted: 11/09/2010] [Indexed: 12/29/2022]
Abstract
BACKGROUND Dermatological methyl-aminolevulinate photodynamic therapy (MAL-PDT) is utilized to successfully treat dermatological conditions. This study monitored fluorescence changes attributed to the accumulation and destruction of the photosensitizer, protoporphyrin IX (PpIX), at several different stages during the first and second treatments of clinical dermatological MAL-PDT. METHODS A commercially available, non-invasive, fluorescence imaging system (Dyaderm, Biocam, Germany) was utilized to monitor fluorescence changes during the first and second MAL-PDT treatments in seventy-five lesions. RESULTS The clinical data indicated statistically significant increases in fluorescence within lesions following the application of MAL for both treatments (P<0.001 and P<0.01 respectively) and subsequent statistically significant decreases in fluorescence within the lesions following light irradiation for both treatments (P<0.001 and P<0.01 respectively) whilst normal skin fluorescence remained unaltered. Lesions receiving a second treatment accumulated and dissipated significantly less PpIX (P<0.05) than during the first treatment. No significant differences were noted in PpIX accumulation or dissipation during MAL-PDT when gender, age, lesion type and lesion surface area were considered. CONCLUSIONS It can therefore be concluded that PpIX fluorescence imaging can be used in real-time to assess PpIX levels during dermatological PDT. Similar observations were recorded from the three currently licensed indications indicating that the standard 'one size fits all' protocol currently employed appears to allow adequate PpIX accumulation, which is subsequently fully utilized during light irradiation regardless of patient age, gender or lesion surface area.
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Affiliation(s)
- Jessica Tyrrell
- Clinical Photobiology, Peninsula Medical School, University of Exeter, Royal Cornwall Hospital, Truro, Cornwall, UK
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Abstract
Multiple, complementary techniques for tumor detection, including magnetic resonance, nuclear and optical imaging, are under active development; each approach has particular strengths and advantages. Efforts are also currently underway to develop bifunctional agents, so that a single molecule can be used for imaging, therapy, and monitoring the long-term tumor response. This chapter is mainly focused on illustrating the utility of certain tumor-avid photosensitizers in developing agents for tumor imaging [fluorescence, magnetic resonance imaging (MRI), positron emission tomography (PET)] and photodynamic therapy. Recent approaches for developing target-specific agents for photodynamic therapy (PDT) and in vivo tumor imaging are also briefly discussed.
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Affiliation(s)
- Ravindra K Pandey
- PDT Center, Cell Stress Biology, Roswell Park Cancer Institute, Buffalo, NY, USA
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Feuerstein T, Schauder A, Malik Z. Silencing of ALA dehydratase affects ALA-photodynamic therapy efficacy in K562 erythroleukemic cells. Photochem Photobiol Sci 2009; 8:1461-6. [PMID: 19789817 DOI: 10.1039/b9pp00007k] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthesis of protoporphyrin IX (PpIX) by malignant cells is essential for the success of ALA-based photodynamic therapy (PDT). Two key enzymes that were described as affecting PpIX accumulation during ALA treatment are porphobilinogen deaminase (PBGD) and ferrochelatase. Here, we show that down regulation of ALA dehydratase (ALAD) expression and activity by specific shRNA induced a marked decrease in PpIX synthesis in K562 erythroleukemic cells. Photo-inactivation efficacy following ALA-PDT was directly correlated with ALAD-silencing and cellular levels of PpIX. MTT metabolism following ALA-PDT was shown to be 60% higher in ALAD-silenced cells in comparison to control cells, indicating that mitochondria were protected in the silenced cells. Morphological analysis by scanning electron microscopy (SEM) of cells treated by ALA-PDT showed no morphological changes in ALAD-silenced cells, in contrast to controls exhibiting cell deformations and lysis. Membrane integrity following ALA-PDT was kept intact and undamaged in ALAD-silenced cells as examined by Annexin V-FITC/PI staining and LDH-L leakage. We conclude that ALAD, although it is present in the cell at abundant levels, has a major and limiting role in regulating PpIX synthesis and ALA-PDT outcome.
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Affiliation(s)
- Tamar Feuerstein
- Microscopy Unit, Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan, 52900, Israel
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Giuntini F, Bourré L, MacRobert AJ, Wilson M, Eggleston IM. Improved Peptide Prodrugs of 5-ALA for PDT: Rationalization of Cellular Accumulation and Protoporphyrin IX Production by Direct Determination of Cellular Prodrug Uptake and Prodrug Metabolization. J Med Chem 2009; 52:4026-37. [DOI: 10.1021/jm900224r] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Francesca Giuntini
- Wolfson Laboratory of Medicinal Chemistry, Department of Pharmacy and Pharmacology, University of Bath, Bath BA2 7AY, U.K., National Medical Laser Centre, Division of Surgical and Interventional Sciences, UCL Medical School, University College London, London W1W 7EJ, U.K., Division of Microbial Diseases, UCL Eastman Dental Institute, University College London, London WC1X 8LD, U.K
| | - Ludovic Bourré
- Wolfson Laboratory of Medicinal Chemistry, Department of Pharmacy and Pharmacology, University of Bath, Bath BA2 7AY, U.K., National Medical Laser Centre, Division of Surgical and Interventional Sciences, UCL Medical School, University College London, London W1W 7EJ, U.K., Division of Microbial Diseases, UCL Eastman Dental Institute, University College London, London WC1X 8LD, U.K
| | - Alexander J. MacRobert
- Wolfson Laboratory of Medicinal Chemistry, Department of Pharmacy and Pharmacology, University of Bath, Bath BA2 7AY, U.K., National Medical Laser Centre, Division of Surgical and Interventional Sciences, UCL Medical School, University College London, London W1W 7EJ, U.K., Division of Microbial Diseases, UCL Eastman Dental Institute, University College London, London WC1X 8LD, U.K
| | - Michael Wilson
- Wolfson Laboratory of Medicinal Chemistry, Department of Pharmacy and Pharmacology, University of Bath, Bath BA2 7AY, U.K., National Medical Laser Centre, Division of Surgical and Interventional Sciences, UCL Medical School, University College London, London W1W 7EJ, U.K., Division of Microbial Diseases, UCL Eastman Dental Institute, University College London, London WC1X 8LD, U.K
| | - Ian M. Eggleston
- Wolfson Laboratory of Medicinal Chemistry, Department of Pharmacy and Pharmacology, University of Bath, Bath BA2 7AY, U.K., National Medical Laser Centre, Division of Surgical and Interventional Sciences, UCL Medical School, University College London, London W1W 7EJ, U.K., Division of Microbial Diseases, UCL Eastman Dental Institute, University College London, London WC1X 8LD, U.K
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