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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
71

Otimização da Terapia Fotodinâmica em micro-organismos sob inibição de bomba de efluxo /

Coletti, Tatiana Maria Starck Fogaça de Aguiar. January 2016 (has links)
Orientador: Carla Raquel Fontana Mendonça / Coorientador: Ana Marisa Fusco Almeida / Banca: Madalena Palomari Spolidorio / Banca: Juliana Cabrini Carmello / Banca: Eliane Trovatti / Banca: Cristiane Costa Quishida / Resumo: A necessidade de superar a resistência dos micro-organismos frente aos fármacos disponíveis, a fim de se chegar ao sucesso terapêutico leva a uma constante exploração de novas abordagens para este fim. Os sistemas de efluxo multidrogas tem sido um profundo obstáculo para uma terapêutica bem-sucedida utilizando-se antimicrobianos existentes hoje no mercado. A descoberta de bloqueadores desses sistemas complementa estudos envolvendo terapias nãoconvencionais, como a Terapia Fotodinâmica Antimicrobiana (Antimicrobial Photodynamic Therapy - aPDT). Este estudo teve como objetivo avaliar a aPDT mediada pelo azul de metileno (AM) associada com inibidores de bomba de efluxo em diferentes espécies microbianas. Para isso, foram utilizados como inibidor o verapamil, em biofilmes de Escherichia coli e Staphylococcus aureus, e verapamil e farnesol para Candida albicans. A determinação da combinação ideal de Inibidor/AM foi feita através do cruzamento de diferentes concentrações dos compostos, de tal forma que todas as combinações possíveis fossem avaliadas, nas concentrações previamente determinadas através da concentração inibitória mínima. O metabolismo celular para todas as condições experimentais foi avaliado por meio do ensaio de redução do XTT. As combinações onde foram verificadas a redução de 80% no metabolismo foram plaqueadas e a contagem de células (UFC/ml) determinada. Os resultados obtidos permitiram observar que para E. coli, foram necessárias uma dose maior de luz (44 J/cm2... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Conventional antimicrobials are mostly ineffective due to emerging antimicrobial resistance acquired by pathogenic micro-organisms. The need to overcome this resistance to reach therapeutic success has led to exploration of new approaches. Multidrug efflux systems have been a profound obstacle to achieve success in some specific cases with the available antibiotics today. The discovery of efflux pump inhibitors systems can act as an adjuvant to alternative therapies such as Antimicrobial Photodynamic Therapy (aPDT). This study aimed to evaluate the association of aPDT mediated by methylene blue (MB), with efflux pump inhibitors in different microbial species. Verapamil was used as an inhibitor in biofilm of Escherichia coli and Staphylococcus aureus, and verapamil and farnesol were expected to block the pumps for Candida albicans. The determination of the optimal combination of Inhibitor/MB was carried out by crossing different concentrations of the compounds. Cell metabolism for all experimental conditions was assessed by XTT reduction assay. The combinations where 80% of metabolism reduction was observed, cells were plated and colony count units (cfu/ml) determined. The E. coliresults showed requirement of higher light dose (44 J/cm2 ) and a lower concentration of verapamil (215 μg/mL) to achieve reduction of 3.4 log10 (CFU/mL). Compared to S. aureus, a lower dose of light (22 J/cm2 ) was needed, and a higher concentration of verapamil (312 μg/mL), was necessary to obtain reduction of 3.65 log10 (CFU/ml). For C. albicans, verapamil presented lower reduction of biofilm viable cells compared to farnesol. Setting the same light dose (44 J/cm2 ), the combination verapamil/MB: 215/400 showed reduction of 2,82 log10 (CFU/mL) and farnesol/MB: 22/200 determined reduction of 3.82 log10 (CFU/mL). Briefly, aPDT mediated MB, associated with an efflux pump... (Complete abstract click electronic access below) / Doutor
72

Efeito fotodinâmico da curcumina em micelas de cetrimida sobre cepas de candida susceptíveis e resistentes a fluconazol

Coletti, Tatiana Maria Starck Fogaça de Aguiar [UNESP] 22 January 2013 (has links) (PDF)
Made available in DSpace on 2014-06-11T19:22:21Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-01-22Bitstream added on 2014-06-13T19:27:33Z : No. of bitstreams: 1 coletti_tmsfa_me_arafcf.pdf: 679985 bytes, checksum: 44586dabcae6690099fbdb0e6005a933 (MD5) / Nos últimos anos o aumento na incidência da candidose superficial ou invasiva causada por espécies emergentes e resistentes aos medicamentos tem sido atribuído a disseminação do uso de antibióticos e/ou agentes imunossupressores. A candidose é considerada uma doença oportunista de alta incidência em pacientes que utilizam medicamentos imunossupressores após transplante de órgãos, antibióticos de amplo espectro, terapias antineoplásicas e nos que possuem imunossupressão relacionada à síndrome da imunodeficiência adquirida. A Terapia Fotodinâmica (Photodynamic Therapy ou PDT) utiliza a combinação de luz (visível) e um composto fotossensível. A maior aplicação da PDT ocorre no tratamento de câncer, entretanto, a técnica está difundindo-se para o tratamento de outras doenças como infecções microbianas. O objetivo desse trabalho foi avaliar o efeito da PDT mediada pela Curcumina, na ausência e na presença do surfactante brometo de cetiltrimetilamônio (CTAB), com uma fonte de luz do tipo LED, sobre suspensões planctônicas de isolados clínicos das espécies C. albicans e C. glabrata fluconazol-resistentes, bem como de cepas ATCC. Após a PDT, foram obtidas diluições seriadas de cada amostra e alíquotas foram plaqueadas para a contagem das células viáveis (ufc/mL). O metabolismo celular para todas as condições experimentais também foi avaliado por meio do ensaio de redução do 2,3-bis[2-methoxy-4-nitro-5-sulphophenyl]2H-tetrazolium-carboxanilida (XTT). Também foi avaliada a capacidade de adesão/formação de biofilme dessas cepas após a PDT. Para isso, amostras obtidas da fase de adesão e da fase madura dos biofilmes foram monitoradas pela contagem de células viáveis (ufc/mL). Os resultados permitem observar que a utilização da PDT com curcumina em micelas de CTAB em suspensões planctônicas... / In recent years the increase in the incidence of superficial or invasive candidiasis caused by species emerging drug-resistant and has been attributed to widespread use of antibiotics and/or immunosuppressive agents. Candidiasis is considered an opportunistic disease of high incidence in patients taking immunosuppressive drugs after organ transplantation, broad-spectrum antibiotics, anticancer therapies and who has immunosuppression related to acquired immunedeficiency syndrome. Photodynamic Therapy (PDT) uses a combination of (visible) light and a photosensitive compound. The largest application of PDT occurs in the treatment of cancer, however, the technique is diffusing in the treatment of other diseases such microbial infections. The aim of this study was to evaluate the effect of PDT mediated by Curcumin, in the absence and presence of surfactant cetyltrimethylammonium bromide (CTAB) with a light source type LED on planktonic suspensions of clinical isolates of the species C. albicans and C. glabrata Fluconazole-resistant strains as well as strains ATCC. After PDT, serial dilutions were collected and aliquots of each sample were plated for viable cell count (cfu/ml). Cellular metabolism for all experimental conditions was also assessed by reduction assay of 2,3-bis [2-methoxy-4-nitro-5-sulphophenyl]-2H-tetrazolium carboxanilide (XTT). It was also evaluated the ability of adhesion/biofilm formation of these strains after PDT. For this, samples of the accession and the mature phase biofilms were monitored by viable cell count (cfu/mL). The results allow to observe that the use of PDT with curcumin in CTAB micelles in planktonic suspensions was able to decrease metabolism (XTT) strains of C. albicans and C. glabrata susceptible and resistant to fluconazole, however, the reduction in viable cell count... (Complete abstract click electronic access below)
73

Synthetic studies of functional zinc phthalocyanines and boron dipyrromethenes. / CUHK electronic theses & dissertations collection

January 2009 (has links)
1H and 13C{1H} NMR spectra of all the new compounds and crystallographic data are given in the Appendix. / Chapter 1 presents an overview of phthalocyanines including their general synthesis, properties, and applications. Special attention has been placed on the unsymmetrical analogues, and those which are efficient photosensitizers in photodynamic therapy. A brief account on BODIPYs as another versatile class of functional dyes is also given. / Chapter 2 describes the synthesis, spectroscopic characterization, photophysical properties, and in vitro photodynamic activities of three novel amphiphilic zinc(II) phthalocyanines substituted with one or two 3,4,5-tris(3,6,9-trioxadecoxy)benzoxy group(s). These compounds exhibit significantly higher photodynamic activities toward HepG2 and HT29 cell lines. The alpha-substituted analogue is particularly potent with IC50 values as low as 0.02 microM. The higher photodynamic activity of this compound can be attributed to its lower aggregation tendency in the culture media as shown by absorption spectroscopy and higher cellular uptake as suggested by the stronger intracellular fluorescence, resulting in a higher efficiency to generate reactive oxygen species inside the cells. / Chapter 4 focuses on a related series of 1,4-disubstituted zinc(II) phthalocyanines. These compounds possess two oligoethylene glycol methyl ether chains with various length at the 1,4-di-alpha-positions. The effects of the chain length on their aggregation, photophysical properties, cellular uptake, and in vitro photodynamic activities have been explored. / Chapter 5 presents the synthesis, characterization, and photophysical properties of another series of zinc(II) phthalocyanines conjugated with one, two or four isopropylidene protected glucofuranose unit(s) through a tetraethylene glycol linker. With these hydrophilic substituents, these macrocycles are highly soluble in common organic solvents and biological media. Their in vitro photodynamic activities toward HT29 and HepG2 cells have also been evaluated. Compared with the tetra-glucosylated phthalocyanines, which are almost nonphotocytotoxic, the mono- and di-glucosylated analogues exhibit a higher photodynamic activity. The di-alpha-substituted analogue is particularly potent with IC50 values as low as 0.03 microM. / Chapter 6 reports the synthesis, characterization, and photophysical properties of two novel conjugates of subphthalocyanine substituted axially with a BODIPY or distyryl-BODIPY moiety. Both systems absorb over a broad range in the visible region. They also exhibit a highly efficient photo-induced energy transfer process either from the excited BODIPY to the subphthalocyanine core or from the excited subphthalocyanine to the distyryl-BODIPY unit. The energy transfer quantum yields are close to unity for both of these conjugates. / Chapter 7 describes the preparation and photophysical properties of another two BODIPY and monostyryl-BODIPY conjugates which are linked to a silicon(IV) phthalocyanine core. These conjugates serve as excellent artificial photosynthetic models for the study of energy and electron transfer processes. Depending on the axial substituents, these conjugates exhibit predominantly a photo-induced energy or electron transfer process in toluene. / The related studies of a series of novel di-alpha-substituted zinc(II) phthalocyanines having two biocompatible triethylene glycol methyl ether chains or glycerol moieties are described in Chapter 3. Compared with the unsubstituted analogue, these compounds have a red-shifted Q band, and exhibit a relatively weaker fluorescence emission and higher efficiency to generate singlet oxygen. As a result, these compounds are promising candidates for photodynamic therapy. In vitro studies on HepG2 and HT29 cells have shown that they are highly photocytotoxic with IC50 values as low as 0.06 microM. / This thesis describes my synthetic studies on several series of functional zinc(II) phthalocyanines and boron dipyrromethenes (BODIPYs). Their applications as efficient photosensitizers in photodynamic therapy and light harvesting systems have also been explored. / Liu, Jianyong. / Adviser: Dennis Keepui Ng. / Source: Dissertation Abstracts International, Volume: 71-01, Section: B, page: 0326. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2009. / Includes bibliographical references. / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. Ann Arbor, MI : ProQuest Information and Learning Company, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstracts in English and Chinese.
74

Eficiência da terapia fotodinâmica em Staphylococcus aureus e Escherichia coli /

Ronqui, Maria Rita. January 2014 (has links)
Orientador: Carla Raquel Fontana / Banca: Clóvis Wesley Oliveira de Souza / Banca: Ana Marisa Fusco Almeida / Resumo: A ocorrência de uma variedade de agentes patogênicos resistentes aos antibióticos atuais continua a ser um problema, especialmente quando as infecções bacterianas estão crescendo em biofilme. Neste estudo, propomos o uso da terapia fotodinâmica (TFD) como monoterapia e também associada à antibioticoterapia como um tratamento alternativo. O objetivo deste estudo foi analisar os efeitos da TFD mediada pelo azul de metileno (AM) em Staphylococcus aureus (ATCC 25923) e Escherichia coli (ATCC 25922), como biofilme e em fase planctônica. Diferentes concentrações de fotossensibilizador (400; 200; 100; 50; 25; 12,5; 6,25 μg/mL) e fluência (2,8; 5,6; 11.2 22,4J/cm²) foram testadas. Também realizamos experimentos que avaliaram o efeito sinérgico da terapia fotodinâmica e o antibiótico ciprofloxacina. Os efeitos bactericidas da TFD como monoterapia não foram estatisticamente aumentados com a concentração de fotossensibilizador, e bactérias em biofilmes foram menos afetadas que as da fase planctônicas. Entretanto, o efeito sinérgico da terapia fotodinâmica seguida de ciprofloxacina no biofilme aumentou a redução bacteriana. Em biofilme para S. aureus, utilizando 50 ug/mL de AM, irradiação 22,4 J/cm² e a concentração de 15.625 ug/mL de antibiótico, tivemos uma redução de 61,80%. Para E. coli, houve uma erradicação bacteriana em todas as concentrações testadas na TFD combinada com antibiótico, tanto a irradiação de 11,2 J/cm², como a irradiação 22,4 J/cm². O crescimento bacteriano foi observado apenas na concentração mais baixa do antibiótico testada, de 0,125 ug/mL, em concentrações de 50 e 25 ug/mL de AM. / Abstract: The occurrence of a variety of pathogens resistant to current antibiotics remains the major problem especially when bacterial infections are growing in biofilm. In this study, we propose the use of photodynamic therapy (PDT) as monotherapy and also associated with antibiotic therapy as an alternative treatment. The aim of this study was to analyze the effects of PDT mediated by methylene blue (MB) on Staphylococcus aureus (ATCC 25923) and Escherichia coli (ATCC 25922) as biofilm and planktonic phase. Different concentrations of photosensitizer (400; 200; 100; 50; 25; 12,5; 6,25g/mL), and fluency of 2.8; 5.6; 11.2 22,4J/cm2 were tested. We also carried out experiments that evaluated the synergistic effect of photodynamic therapy and antibiotic ciprofloxacin. The bactericidal effects with PDT as monotherapy were not statistically increased with the concentration of photosensitizer and bacteria in biofilms were less than affect in the planktonic phase. Although, the synergistic effect of photodynamic therapy on biofilms followed by ciprofloxacin amplified the bacterial reduction. In biofilm for S. aureus, using 50 μg/ml MB, irradiation 22,4 J/cm² and the concentration of 15,625 μg/mL of antibiotic, got a reduction of 61,80%. For E. coli, there was a bacterial eradication at all concentrations tested in PDT combined with antibiotic, both the irradiation 11,2 J/cm² as the irradiation 22,4 J/cm². Bacterial growth was observed only in the lowest tested concentration of the antibiotic, 0,125 μg/mL, at concentrations of 50 and 25 μg/mL MB. / Mestre
75

Role of epidermal growth factor receptor (EGFR) and mitogen-activated protein kinases (MAPKs) signaling pathways in Zn-BC-AM photodynamic therapy-induced apoptosis of the well-differentiated nasopharyngeal carcinoma cell

Koon, Ho Kee 01 January 2009 (has links)
No description available.
76

Ação da terapia fotodinâmica (TFD) sobre o biofilme dentário humano / The action of photodynamic therapy on human dental plaque

Vanessa Tessarolli 29 November 2010 (has links)
Entre os métodos de prevenção da cárie dentária, os controles mecânico e químico do biofilme dentário são de grande relevância neste processo. O controle mecânico é eficaz desde que executado diariamente e sistematicamente envolver todas as superfícies dentárias expostas ao meio bucal. Ele pode ser realizado pelo odontólogo por meio da profilaxia profissional e pelo próprio paciente pela escovação dentária. O controle químico do biofilme dentário deve ser empregado de forma suplementar, quando o controle mecânico não puder ser realizado diariamente ou se for realizado de forma inadequada acarretando o risco do acúmulo do biofilme dentário e como consequência, a ocorrência de lesões de cárie dentária e/ou da doença periodontal. O ideal seria associar ambos os métodos, para que um compense a deficiência do outro. É nesta direção que inúmeros estudos são feitos nos últimos anos. Para o controle químico, são relatadas na literatura inúmeras substâncias antimicrobianas. Dentre os agentes químicos recomendados, a clorexidina (CLX) tem se mostrado eficiente para esta finalidade, porém, sua aplicação apresenta limitações como: manchamento de áreas desmineralizadas dos dentes e perda do paladar, condições estas que limitam seu uso por tempo prolongado. Sendo assim, a busca de alternativas para o controle microbiano do biofilme dentário é de grande relevância para se somar aos esforços ora empreendidos neste sentido. Nas últimas décadas o emprego da luz associada a corantes surgiu como um tratamento alternativo ao uso de agentes antimicrobianos tradicionais. Este tratamento é chamado terapia fotodinâmica (TFD), sendo recentemente também chamado de Terapia Fotodinâmica Antimicrobiana (TFDA). Na TFDA, a luz interage com o corante que está associado ao microorganismo, sendo capaz de inibir sua proliferação ou eliminá-lo completamente. Poucos são os estudos que avaliam a ação antimicrobiana da TFD sobre biofilmes cariogênicos. A comprovação da eficácia dessa terapia sobre o biofilme dentário humano poderá ter um impacto positivo para a Odontologia, favorecendo a implantação de novos protocolos de controle químico do mesmo. Este estudo teve como objetivo analisar comparativamente o efeito da clorexidina e da TFDA (com dois tipos de fotossensibilizadores: Azul de Toluidina O (TBO) e Clorofila Líquida (CL)) sobre biofilmes dentários humanos formados in situ. Voluntários utilizaram um dispositivo intrapalatino contendo espécimes de esmalte dental, sobre os quais biofilme dentário foi formado. Após 48 horas, diferentes terapias foram aplicadas sobre o biofilme: (1) água destilada: controle negativo; (2)CLX; (3) irradiação por laser; (4) TBO; (5) TBO +laser; (6) CL; (7) CL + laser. O biofilme então foi coletado e solubilizado. Em seguida, amostras foram semeadas em placas de Petri com diferentes meios de cultura, para contagem do número de microrganismos totais, estreptococos totais, Streptococcos mutans, Lactobacilos e Candida albicans. Amostras também foram coradas com Laranja de Acridina e visualizadas em microscopia de fluorescência, para análise da viabilidade das células presentes. Os resultados dos plaqueamentos apenas nos deram informações sobre os microrganismos totais e estreptococos totais, mostrando que a única redução significante dos microorganismos em relação ao grupo (1) ocorreu no grupo tratado por CLX (2). As outras terapias mostraram uma sensível redução. A viabilidade por microscopia por fluorescência se mostrou semelhante em todos os grupos. A clorexidina, portanto, comprovou seu efeito antimicrobiano, porém mais estudos precisam ser realizados para verificar o real papel da TFD sobre biofilme dentário humano. / The mechanical and chemical controls of dental plaque are important methods of caries prevention. The mechanical control is efficient if its run properly and daily. It can be made by a dentist (professional cleaning) or by patients themselves (toothbrushing). The chemical control should be used additionally, when the mechanical control cant be performed properly, them the biofilm can accumulate and in consequence, there are risks of dental caries or periodontal disease. For chemical control, many antimicrobial substances are related in literature. Several studies have shown that chlorexidine (CLX) is an effective antimicrobial substance against dental plaque. However, it presents some limitations like: tooth staining, loss of taste, conditions that limit its use by prolonged periods. Therefore, the search by new alternatives in microbial control of plaque is very important for improvement the treatment. In last decades, the use of light for activation of a photosensitizer appears like an alternative treatment with antimicrobial function. This treatment is called Photodynamic Therapy (PDT), recently Photochemotherapy (PACT). In PACT, the light activates a photosensitizer that is bond in microorganism and it can kill it or inhibit its growing. If this treatment is effective on human dental plaque, it will have positive impact for Dentistry and new protocols of chemical control will be developed. The present study aim was analyze the chlorexidine effect and the PDT effect (using Toluidine blue (TBO) and Liquid Chlorophyll (LC) like photosensitizer) in human natural dental plaque formed in situ. Volunteers wore a palatal appliance containing bovine enamel blocks, where the biofilm was formed. After 48 hours, different therapies were performed on plaque: (1) distilled water: negative control; (2) CLX; (3) Laser irradiation; (4) TBO; (5) TBO + Laser; (6) CL; (7) CL + Laser. The plaque samples were collected and dispersed. Next, serial dilutions were prepared and seeded onto different culture broth for the determination of the number of colony-forming units per gram (CFU/g) of total microorganisms, total Streptococcus, Streptococcus mutans, Lactobacillus and C. albicans. Samples were stained with acridine orange to analyze cells viability. The results can reveal only information about total microorganism and total Streptococcus. When the groups (2-7) were compared with the group (1), significant microbial reduction was observed only in group treated with CLX (3). The other therapies showed only a discrete reduction in relation of group (1). The cell viability showed similar results in all groups. Therefore, the CLX proved its antimicrobial effect. More studies are necessary for exact evaluation of effect of TFD on dental plaque human.
77

Photodynamic therapy with haematoporphyrin derivative / by Prudence Anne Cowled

Cowled, Prudence Anne January 1986 (has links)
Bibliography: leaves 159-194 / xi, 194 leaves, [3] leaves of plates : ill. (2 col.) ; 31 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, 1986
78

Aspects of fluorescence diagnostics and photodynamic therapy in non-melanoma skin cancer /

Sandberg, Carin, January 2009 (has links)
Diss. (sammanfattning) Göteborg : Göteborgs universitet, 2009. / Härtill 4 uppsatser.
79

Pyridinium bis-retinoids : extraction, synthesis, and folate coupling /

Alvarez, Mary Allison Lawyer, January 2007 (has links) (PDF)
Thesis (M.S.)--Brigham Young University. Dept. of Chemistry and Biochemistry, 2007. / Includes bibliographical references (p. 117-122).
80

Efetividade da Terapia fotodinâmica mediada pelo fotossensibilizador photodithazine® na inativação de candida albicans in vivo

Carmello, Juliana Cabrini [UNESP] 28 March 2011 (has links) (PDF)
Made available in DSpace on 2014-06-11T19:28:38Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-03-28Bitstream added on 2014-06-13T20:58:44Z : No. of bitstreams: 1 carmello_jc_me_arafo.pdf: 701741 bytes, checksum: 55eb9d8f5746ef34ede24573f0c2455a (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Este trabalho teve por objetivo avaliar a efetividade da terapia fotodinâmica (PDT) mediada pelo fotossensibilizador (FS) Photodithazine® (PDZ), associado à luz do tipo LED (660nm). Para tanto, foram utilizados 55 camundongos com aproximadamente 6 semanas de vida, os quais foram submetidos a indução de candidose no dorso da língua. Inicialmente os animais foram imunossuprimidos e no dia seguinte se realizou a inoculação de C. albicans na língua dos mesmos por meio de swabs embebidos na suspensão (107 Ufc/mL). Para a realização da terapia fotodinâmica o FS foi avaliado nas concentrações de 75, 100, 125 e 150mg/L. Tais grupos experimentais foram denominados de (P+L+ 75mg/L, P+L+ 100mg/L, P+L+ 125mg/L, P+L+ 150mg/L) associados a uma dose de luz de 37,5 J/cm2. Para a verificação apenas do efeito da PDZ, a mesma foi aplicada na língua dos animais, sem iluminação (grupos denominados de P+L- 75mg/L, P+L- 100mg/L, P+L- 125mg/L, P+L- 150mg/L). O efeito da luz foi avaliado por meio da iluminação das línguas com dose de luz de 37,5J/cm2, (grupo denominado de P-L+ 37,5J/cm2). Um grupo recebeu apenas inoculação por Candida (grupo P-L-, controle positivo), outro grupo não recebeu nenhum tratamento e nem inoculação fúngica (grupo CN – controle negativo). Após os experimentos realizou-se a recuperação de C. albicans das línguas dos animais por meio de swabs que foram esfregados sobre as mesmas durante 1 minuto. Esses swabs foram embebidos em tubos de ensaio com 1mL de solução salina, e diluições seriadas foram realizadas e colocadas em placas de petri com SDA. Após 48 horas de incubação a 37º C as células fúngicas foram quantificadas e o número de Ufc/mL foi determinado e analisado pelo teste ANOVA (P<.05). Os camundongos foram sacrificados e tiveram as línguas removidas cirurgicamente para realização da análise histológica. Os resultados demonstraram... / The aim of this investigation was to evaluate the effectiveness of photodynamic therapy (PDT) mediated by photossensitizer Photodithazine® (PDZ) associated with LED light (660nm) for the photoinactivation of C. albicans in a murine model of oral candidosis. Fifty-five 6-week-old female Swiss mice were immunossuppressed and in the next day small cotton pads were soaked in a C. albicans cell suspension (107CFU/mL) and swabbed in the oral cavity of mice. PDT was performed and the PS was applicated topically on the dorsum of the tongue of mice at concentrations 75, 100, 125 and 150mg/L (P+L+75, P+L+100, P+L+125 and P+L+150mg/L) associated with LED at a fluence of 37,5J/cm2. The effect of PS only was tested by application of PDZ for the same period of pre-irradiation time and irradiation at the same concentration as that for the P+L+ group, without the LED illumination (P+L-75, P+L-100, P+L-125 and P+L-150mg/L). To verify the effect of the light only, the group was exposed to the same LED dose mentioned previously (P-L+ 37,5J/cm2), 1 group). The positive control did not receive any PS or light (P-L-). The negative control group (CN) of animals was evaluated and mice did not receive any treatment. After treatment the dorsum of the tongue was swabbed for 1 minute with a cotton pad to recover C. albicans cells and the microbiological evaluation was performed. The yeast colony counts were quantified and the number of CFU/mL was determined and analyzed by ANOVA test (P<.05). Animals were killed 24 hours after treatment and the tongue of all mice were surgically removed for histological analysis. The results of this investigation demonstrated that PDT was effective in reducing C. albicans recovered from the tongue of mice at concentrations 100, 125 and 150mg/L of PS when compared with the animals from the positive control group (P-L-) (P<0.05). There was no difference between these concentrations... (Complete abstract click electronic access below)

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