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Rehem AR, da Gama Viveiro LR, De Souza Santos EL, do Carmo PHF, da Silva NS, Junqueira JC, Scorzoni L. Antifungal and antibiofilm effect of duloxetine hydrochloride against Cryptococcus neoformans and Cryptococcus gattii. Folia Microbiol (Praha) 2024:10.1007/s12223-024-01164-1. [PMID: 38652436 DOI: 10.1007/s12223-024-01164-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Accepted: 04/05/2024] [Indexed: 04/25/2024]
Abstract
Cryptococcosis is an invasive mycosis caused mainly by Cryptococcus gattii and C. neoformans and is treated with amphotericin B (AMB), fluconazole and 5-fluorocytosine. However, antifungal resistance, limited and toxic antifungal arsenal stimulate the search for therapeutic strategies such as drug repurposing. Among the repurposed drugs studied, the selective serotonin reuptake inhibitors (SSRIs) have shown activity against Cryptococcus spp. However, little is known about the antifungal effect of duloxetine hydrochloride (DH), a selective serotonin and norepinephrine reuptake inhibitor (SSNRI), against C. neoformans and C. gattii. In this study, DH inhibited the growth of several C. neoformans and C. gattii strains at concentrations ranging from 15.62 to 62.50 µg/mL. In addition, DH exhibited fungicidal activity ranging from 15.62 to 250 µg/mL. In biofilm, DH treatment reduced Cryptococcus spp. biomass at a level comparable to AMB, with a significant reduction (85%) for C. neoformans biofilms. The metabolic activity of C. neoformans and C. gattii biofilms decreased significantly (99%) after treatment with DH. Scanning electron micrographs confirmed the anti-biofilm activity of DH, as isolated cells could be observed after treatment. In conclusion, DH showed promising antifungal activity against planktonic cells and biofilms of C. neoformans and C. gattii, opening perspectives for further studies with DH in vivo.
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Affiliation(s)
- Amanda Rodrigues Rehem
- Department of Biosciences and Oral Diagnosis, Institute of Science and Technology, São Paulo State University (UNESP), Av. Engenheiro Francisco José Longo, 777 São José dos Campos, São Paulo 12245-000, Brazil
| | - Letícia Rampazzo da Gama Viveiro
- Department of Biosciences and Oral Diagnosis, Institute of Science and Technology, São Paulo State University (UNESP), Av. Engenheiro Francisco José Longo, 777 São José dos Campos, São Paulo 12245-000, Brazil
| | - Evelyn Luzia De Souza Santos
- Department of Biosciences and Oral Diagnosis, Institute of Science and Technology, São Paulo State University (UNESP), Av. Engenheiro Francisco José Longo, 777 São José dos Campos, São Paulo 12245-000, Brazil
| | - Paulo Henrique Fonseca do Carmo
- Department of Biosciences and Oral Diagnosis, Institute of Science and Technology, São Paulo State University (UNESP), Av. Engenheiro Francisco José Longo, 777 São José dos Campos, São Paulo 12245-000, Brazil
| | - Newton Soares da Silva
- Department of Biosciences and Oral Diagnosis, Institute of Science and Technology, São Paulo State University (UNESP), Av. Engenheiro Francisco José Longo, 777 São José dos Campos, São Paulo 12245-000, Brazil
| | - Juliana Campos Junqueira
- Department of Biosciences and Oral Diagnosis, Institute of Science and Technology, São Paulo State University (UNESP), Av. Engenheiro Francisco José Longo, 777 São José dos Campos, São Paulo 12245-000, Brazil
| | - Liliana Scorzoni
- Department of Biosciences and Oral Diagnosis, Institute of Science and Technology, São Paulo State University (UNESP), Av. Engenheiro Francisco José Longo, 777 São José dos Campos, São Paulo 12245-000, Brazil.
- Universidade de Guarulhos (UNG), Programa de Pós-Graduação em Enfermagem, Guarulhos, SP, Brasil.
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da Silva MGP, Manfroi LA, Lobo LZ, Vieira ÂA, Macário PF, Fukumasu NK, da Silva NS, Tschiptschin AP, Marques FDC, Vieira L. Sputtering of micro-carbon-silver film (μC-Ag) for endotracheal tubes to mitigate respiratory infections. Biomed Mater 2023; 18. [PMID: 36753761 DOI: 10.1088/1748-605x/acba70] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2021] [Accepted: 02/08/2023] [Indexed: 02/10/2023]
Abstract
Polyurethane (PU) substrates are biocompatible materials widely used to manufacture endotracheal tubes. However, in common with other biomedical materials, they are liable to the formation of microbial films. The occurrence of pneumonia in intubated patients treated at intensive care units often takes the form of ventilator-associated pneumonia (VAP). The issue relates to the translocation of pathogenic microorganisms that colonize the oropharyngeal mucosa, dental plaque, stomach, and sinuses. New protective materials can provide a more effective therapeutic approach to mitigating bacterial films. This work concerns microcrystalline carbon film containing dispersed silver nanoparticles (μC-Ag) deposited on PU substrates using a physical vapor deposition sputtering process. For the first time, carbon paper was used to produce a carbon target with holes exposing a silver disk positioned under the carbon paper, forming a single target for use in the sputtering system. The silver nanoparticles were well distributed in the carbon film. The adherence characteristics of the μC-Ag film were evaluated using a tape test technique, and electron dispersive x-ray mapping was performed to analyze the residual particles after the tape test. The microbicidal effect of the thin film was also investigated using speciesS. aureus, a pathogenic microorganism responsible for most infections of the lower respiratory tract involving VAP and ventilator-associated tracheobronchitis (VAT). The results demonstrated that μC-Ag films on PU substrates are promising materials for mitigating pathogenic microorganisms on endotracheal tubes.
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Affiliation(s)
| | - Lucas Augusto Manfroi
- Universidade do Vale do Paraíba (UNIVAP), Av. Shishima Hifumi, 2911, São José dos Campos, SP 12244-000, Brazil
| | - Larissa Zamboni Lobo
- Universidade do Vale do Paraíba (UNIVAP), Av. Shishima Hifumi, 2911, São José dos Campos, SP 12244-000, Brazil
| | - Ângela Aparecida Vieira
- Universidade do Vale do Paraíba (UNIVAP), Av. Shishima Hifumi, 2911, São José dos Campos, SP 12244-000, Brazil
| | - Paulo Fabrício Macário
- Universidade do Vale do Paraíba (UNIVAP), Av. Shishima Hifumi, 2911, São José dos Campos, SP 12244-000, Brazil
| | - Newton Kiyoshi Fukumasu
- Universidade de São Paulo (USP), Departamento de Engenharia Mecânica, São Paulo, SP 05508-010, Brazil
| | - Newton Soares da Silva
- Universidade do Vale do Paraíba (UNIVAP), Av. Shishima Hifumi, 2911, São José dos Campos, SP 12244-000, Brazil
| | - André Paulo Tschiptschin
- Universidade de São Paulo (USP), Departamento de Engenharia Mecânica, São Paulo, SP 05508-010, Brazil
| | | | - Lúcia Vieira
- Universidade do Vale do Paraíba (UNIVAP), Av. Shishima Hifumi, 2911, São José dos Campos, SP 12244-000, Brazil
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do Carmo PHF, Garcia MT, Figueiredo-Godoi LMA, Lage ACP, da Silva NS, Junqueira JC. Metal Nanoparticles to Combat Candida albicans Infections: An Update. Microorganisms 2023; 11:microorganisms11010138. [PMID: 36677430 PMCID: PMC9861183 DOI: 10.3390/microorganisms11010138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 12/29/2022] [Accepted: 01/03/2023] [Indexed: 01/06/2023] Open
Abstract
Candidiasis is an opportunistic mycosis with high annual incidence worldwide. In these infections, Candida albicans is the chief pathogen owing to its multiple virulence factors. C. albicans infections are usually treated with azoles, polyenes and echinocandins. However, these antifungals may have limitations regarding toxicity, relapse of infections, high cost, and emergence of antifungal resistance. Thus, the development of nanocarrier systems, such as metal nanoparticles, has been widely investigated. Metal nanoparticles are particulate dispersions or solid particles 10-100 nm in size, with unique physical and chemical properties that make them useful in biomedical applications. In this review, we focus on the activity of silver, gold, and iron nanoparticles against C. albicans. We discuss the use of metal nanoparticles as delivery vehicles for antifungal drugs or natural compounds to increase their biocompatibility and effectiveness. Promisingly, most of these nanoparticles exhibit potential antifungal activity through multi-target mechanisms in C. albicans cells and biofilms, which can minimize the emergence of antifungal resistance. The cytotoxicity of metal nanoparticles is a concern, and adjustments in synthesis approaches or coating techniques have been addressed to overcome these limitations, with great emphasis on green synthesis.
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Affiliation(s)
- Paulo Henrique Fonseca do Carmo
- Department of Biosciences and Oral Diagnosis, Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos 12245-000, SP, Brazil
- Correspondence: ; Tel.: +55-12-3497-9033
| | - Maíra Terra Garcia
- Department of Biosciences and Oral Diagnosis, Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos 12245-000, SP, Brazil
| | - Lívia Mara Alves Figueiredo-Godoi
- Department of Biosciences and Oral Diagnosis, Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos 12245-000, SP, Brazil
| | | | - Newton Soares da Silva
- Department of Environmental Engineering, Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos 12245-000, SP, Brazil
| | - Juliana Campos Junqueira
- Department of Biosciences and Oral Diagnosis, Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos 12245-000, SP, Brazil
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Dailton Guedes de Oliveira Moraes C, Henrique Godoi B, Chaves Silva Carvalho I, Cristina Pinto J, Carvalho Rossato R, Soares da Silva N, Pacheco Soares C. Genotoxic effects of photodynamic therapy in laryngeal cancer cells - An in vitro study. Exp Biol Med (Maywood) 2019; 244:262-271. [PMID: 30674213 DOI: 10.1177/1535370219826544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
IMPACT STATEMENT Recently, the use of photodynamic therapy grows as an alternative treatment for cancer, since it has a noninvasive characteristic and affinity to the tumor tissue. Accordingly, understanding the therapy's foci of action is important for the technique improvement. This work aims to understand the genotoxic effect triggered by the therapy action, thus evidencing the permanent changes caused to the genetic material of the tumor cell after the treatment. Therefore, to increase the knowledge in this study field, the methodology of the comet assay and count of micronucleus formed after the therapy was adopted in order to understand if the damage caused to the DNA of tumor cell makes its replication process unfeasible in future generations. The study allows a better therapeutic approach to the cancer treatment, making the process of association between therapies a more effective option during the disease treatment.
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Affiliation(s)
- Carlos Dailton Guedes de Oliveira Moraes
- 1 Institute of Research and Development - IP&D, Universidade do Vale do Paraíba - UNIVAP, Laboratory Dynamics of Cellular Compartments, Sao Paulo 12244-000, Brazil
| | - Bruno Henrique Godoi
- 1 Institute of Research and Development - IP&D, Universidade do Vale do Paraíba - UNIVAP, Laboratory Dynamics of Cellular Compartments, Sao Paulo 12244-000, Brazil
| | - Isabel Chaves Silva Carvalho
- 1 Institute of Research and Development - IP&D, Universidade do Vale do Paraíba - UNIVAP, Laboratory Dynamics of Cellular Compartments, Sao Paulo 12244-000, Brazil
| | - Jessica Cristina Pinto
- 1 Institute of Research and Development - IP&D, Universidade do Vale do Paraíba - UNIVAP, Laboratory Dynamics of Cellular Compartments, Sao Paulo 12244-000, Brazil
| | - Rafaella Carvalho Rossato
- 1 Institute of Research and Development - IP&D, Universidade do Vale do Paraíba - UNIVAP, Laboratory Dynamics of Cellular Compartments, Sao Paulo 12244-000, Brazil
| | - Newton Soares da Silva
- 2 Institute of Research and Development - IP&D, Universidade do Vale do Paraíba - UNIVAP, Laboratory of Cell Biology and Tissue, Sao Paulo, CEP 12244-000, Brazil
| | - Cristina Pacheco Soares
- 1 Institute of Research and Development - IP&D, Universidade do Vale do Paraíba - UNIVAP, Laboratory Dynamics of Cellular Compartments, Sao Paulo 12244-000, Brazil
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Souza RKDF, Carvalho ICS, Costa CGDCM, da Silva NS, Pacheco-Soares C. Alteration of Surface Glycoproteins After Photodynamic Therapy. Photomed Laser Surg 2018; 36:452-456. [PMID: 30020857 DOI: 10.1089/pho.2018.4464] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
BACKGROUND Cell membranes have been identified as an important intracellular cancer treatment target, since the glycoconjugates present on the cell surface are involved in numerous cell functions. Photodynamic therapy (PDT) is a therapeutic modality employed in the treatment of tumors that uses visible light to activate a photosensitizer. OBJECTIVE This study analyzed the expression of surface carbohydrates after PDT with two different photosensitizers, 5-aminolevulinic acid (ALA) and Photosan-3. METHODS Mice were injected subcutaneously with 2 × 105 B16 cells. After 7-10 days, the presence of a tumor with a diameter of 3.6 mm was observed. Photosan-3® and 5-aminolevulinic acid-ALA were used in the PDT treatment. Control animals (not submitted to either laser treatment or photosensitizer injection) and treated animals were euthanized 15 days post-treatment. The tumors were irradiated with a red diode laser, λ = 655 nm, energy density of 10 J.cm-2, and power density of 45 mW.cm-2. After 2 weeks of treatment with PDT, the mice were euthanized, the tumors were collected, and the cell surfaces were labeled with lectins concanavalin A (ConA) and wheat germ agglutinin (WGA). RESULTS Fluorescence microscopy analysis of the cell surfaces with lectins ConA and WGA showed the presence of α-mannose and α-glucose. CONCLUSIONS The combined effects of either Photosan-3 or ALA and red laser light on melanoma suggest an inhibitory glycosylation action from PDT on the surface of B16-F10 cells.
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Affiliation(s)
- Roberta Kelly de Faria Souza
- 1 Laboratory Dynamics of Cellular Compartments, Institute of Research and Development-IP&D, Universidade do Vale do Paraíba-UNIVAP , São José dos Campos, São Paulo, Brazil
| | - Isabel Chaves Silva Carvalho
- 1 Laboratory Dynamics of Cellular Compartments, Institute of Research and Development-IP&D, Universidade do Vale do Paraíba-UNIVAP , São José dos Campos, São Paulo, Brazil
| | - Carolina Genúncio da Cunha Menezes Costa
- 1 Laboratory Dynamics of Cellular Compartments, Institute of Research and Development-IP&D, Universidade do Vale do Paraíba-UNIVAP , São José dos Campos, São Paulo, Brazil
| | - Newton Soares da Silva
- 2 Institute of Research and Development-IP&D, Laboratory of Cell Biology and Tissue, Universidade do Vale do Paraíba-UNIVAP , São José dos Campos, São Paulo, Brazil
| | - Cristina Pacheco-Soares
- 1 Laboratory Dynamics of Cellular Compartments, Institute of Research and Development-IP&D, Universidade do Vale do Paraíba-UNIVAP , São José dos Campos, São Paulo, Brazil
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Machado SM, Pacheco-Soares C, Marciano FR, Lobo AO, da Silva NS. Photodynamic therapy in the cattle protozoan Tritrichomonas foetus cultivated on superhydrophilic carbon nanotube. Materials Science and Engineering: C 2014; 36:180-6. [DOI: 10.1016/j.msec.2013.12.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Revised: 11/21/2013] [Accepted: 12/06/2013] [Indexed: 10/25/2022]
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de Paula Rodrigues R, Tini IRP, Soares CP, da Silva NS. Effect of photodynamic therapy supplemented with quercetin in HEp-2 cells. Cell Biol Int 2014; 38:716-22. [DOI: 10.1002/cbin.10251] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Accepted: 01/07/2014] [Indexed: 11/10/2022]
Affiliation(s)
- Rafael de Paula Rodrigues
- Laboratory of Tissue and Cell Biology; Development and Research Institute; Universidade do Vale do Paraíba (UNIVAP); Av. Shishima Hifumi 2911 Urbanova 12244-000 São José dos Campos, SP Brazil
| | - Italo Rigotti Pereira Tini
- Laboratory of Tissue and Cell Biology; Development and Research Institute; Universidade do Vale do Paraíba (UNIVAP); Av. Shishima Hifumi 2911 Urbanova 12244-000 São José dos Campos, SP Brazil
| | - Cristina Pacheco Soares
- Laboratory of Dynamics of Cellular Compartments; Development and Research Institute; Universidade do Vale do Paraíba (UNIVAP); Av. Shishima Hifumi Urbanova 12244-000 São José dos Campos SP 2911 Brazil
| | - Newton Soares da Silva
- Laboratory of Tissue and Cell Biology; Development and Research Institute; Universidade do Vale do Paraíba (UNIVAP); Av. Shishima Hifumi 2911 Urbanova 12244-000 São José dos Campos, SP Brazil
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Siqueira IAWDB, Junior MB, Posso MBS, Silva NSD. AÇÃO DO LASER DE BAIXA INTENSIDADE NA PRODUÇÃO DE METABÓLITOS SECUNDÁRIOS DO DERMATÓFITO TRICHOPHYTON RUBRUM. RevistaUnivap 2012. [DOI: 10.18066/revunivap.v18i32.76] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Machado SM, Lobo AO, Sapucahy ABL, Marciano FR, Corat EJ, da Silva NS. Tritrichomonas foetus adhere to superhydrophilic vertically aligned multi-walled carbon nanotube surface. Materials Science and Engineering: C 2011. [DOI: 10.1016/j.msec.2011.06.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Silva NSD, Machado SM, Filho FCES, Pacheco-Soares C. Basic biological aspects of Tritrichomonas foetus of re-levance to the treatment of bovines suffering of tricho-moniasis. ACTA ACUST UNITED AC 2011. [DOI: 10.4236/ojas.2011.13015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Machado AHA, Moraes KCM, Soares CP, Junior MB, da Silva NS. Cellular Changes After Photodynamic Therapy on HEp-2 Cells Using the New ZnPcBr8 Phthalocyanine. Photomed Laser Surg 2010; 28 Suppl 1:S143-9. [DOI: 10.1089/pho.2009.2561] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
| | - Karen C. M. Moraes
- Universidade Federal de Ouro Preto (UFOP), NUPEB, DECBI, Minas Gerais, Brazil
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Lopes MGDO, Watanabe IS, Soares LES, da Silva NS, da Silva MCP. Ultrastructural Aspects of Female Aging Wistar Rat Epithelium Tongue: A HRSEM and TEM Study. Gerontology 2009; 55:442-8. [DOI: 10.1159/000216829] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2008] [Accepted: 12/12/2008] [Indexed: 11/19/2022] Open
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Moreira LM, Vieira dos Santos F, Lyon JP, Maftoum-Costa M, Pacheco-Soares C, Soares da Silva N. Photodynamic Therapy: Porphyrins and Phthalocyanines as Photosensitizers. Aust J Chem 2008. [DOI: 10.1071/ch08145] [Citation(s) in RCA: 155] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The present work is focussed on the principles of photodynamic therapy (PDT), emphasizing the photochemical mechanisms of reactive oxygen species formation and the consequent biochemical processes generated by the action of reactive oxygen species on various biological macromolecules and organelles. This paper also presents some of the most used photosensitizers, including Photofrin, and the new prototypes of photosensitizers, analysing their physicochemical and spectroscopic properties. At this point, the review discusses the therapeutic window of absorption of specific wavelengths involving first- and second-generation photosensitizers, as well as the principal light sources used in PDT. Additionally, the aggregation process, which consists in a phenomenon common to several photosensitizers, is studied. J-aggregates and H-aggregates are discussed, along with their spectroscopic effects. Most photosensitizers have a significant hydrophobic character; thus, the study of the types of aggregation in aqueous solvent is very relevant. Important aspects of the coordination chemistry of metalloporphyrins and metallophthalocyanines used as photosensitizers are also discussed. The state-of-the-art in PDT is evaluated, discussing recent articles in this area. Furthermore, macrocyclic photosensitizers, such as porphyrins and phthalocyanines, are specifically described. The present review is an important contribution, because PDT is one of the most auspicious advances in the therapy against cancer and other non-malignant diseases.
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da Silva NS, Ribeiro CDM, Machado AHA, Pacheco-Soares C. Ultrastructural changes in Tritrichomonas foetus after treatments with AlPcS4 and photodynamic therapy. Vet Parasitol 2007; 146:175-81. [PMID: 17399904 DOI: 10.1016/j.vetpar.2007.02.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2006] [Revised: 02/05/2007] [Accepted: 02/08/2007] [Indexed: 10/23/2022]
Abstract
The Tritrichomonas foetus is an amitochondrial parasitic protist which causes bovine trichomoniasis, a major sexually transmitted disease in cattle. No effective drugs for this disease have been approved to this date. Photodynamic therapy (PDT) is an experimental treatment that shows great potential for treating bacteria, fungi, yeasts, and viruses. However, the cytotoxic effect of PDT on protozoan has been poorly studied. In this study, PDT with aluminum phthalocyanine tetrasulfonated (AlPcS4) photosensitizer was efficient in killing T. foetus. The mode of cell death in T. foetus after PDT was investigated by transmission electron microscopy. Morphological changes, such as membrane projections, nucleus fragmentation with peripheral masses of heterochromatin, endoplasmic reticulum proliferation, intense cytoplasmic vacuolization, fragmented axostyle-pelta complex, and internalized flagella could be observed. This is the first report to demonstrate cell death in T. foetus after PDT, and thus will open up new lines of investigation to develop new treatments for bovine trichomoniasis.
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Affiliation(s)
- Newton Soares da Silva
- Laboratório de Biologia Celular e Tecidual, Instituto de Pesquisa e Desenvolvimento, Universidade do Vale do Paraíba, Av. Shishima Hifumi 2911, 12244-000 São José dos Campos, SP, Brasil.
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de Castro Pazos M, Pacheco-Soares C, Soares da Silva N, DaMatta RA, Pacheco MTT. Ultrastructural effects of two phthalocyanines in CHO-K1 and HeLa cells after laser irradiation. BIOCELL 2003; 27:301-9. [PMID: 15002747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
The effects of Photodynamic Therapy using 2nd generation photosensitizers have been widely investigated aiming clinical application treatment of solid neoplasms. In this work, ultrastructure changes caused by the action of two 2nd generation photosensitizers and laser irradiation on CHO-K1 and HeLa (neoplastic) cells were analyzed by transmission electron microscopy. Aluminum phthalocyanine chloride, aluminum phthalocyanine tetrasulfonate chloride and radiation from a semiconductor laser at a fluency of 0.5 J/cm2 (Power=26 mW; lambda=.670 nm) were used. The results showed induction of apoptosis. Such alterations where observed in HeLa but not in CHO-K1 cells after Aluminum phthalocyanine tetrasulfonate chloride (AlPcS4, photodynamic treatment. The Aluminum phthalocyanine chloride (AlPc) photodynamic treatment induced necrosis on the neoplastic cell line, and cytoplasm and nuclear alterations on the normal cell line.
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Affiliation(s)
- Marcelo de Castro Pazos
- Laboratório de Biologia Celular e Tecidual, Instituto de Pesquisa e Desenvolvimento, Universidade do Vale do Paraíba, Av. Shishima Hifumi, 2911, CEP 12244-000, São José dos Campos, São Paulo, Brazil
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de Castro Pazos M, Pacheco-Soares C, Soares da Silva N, DaMatta R, Pacheco M. Ultrastructural effects of two phthalocyanines in CHO-K1 and HeLa cells after laser irradiation. BIOCELL 2003. [DOI: 10.32604/biocell.2003.27.301] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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