Estudo in vivo dos efeitos da terapia fotodinâmica, mediada pelo Photothazine® e luz led, sobre Cândida Albicans resistente a Fluconazol
Arquivos
Data
2013-03-28
Autores
Alves, Fernanda [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Estadual Paulista (Unesp)
Resumo
Este estudo avaliou os efeitos da Terapia Fotodinâmica (PDT), mediada pelo Photodithazine® (PDZ) e luz LED, sobre Candida albicans resistente a fluconazol em um modelo de candidose oral induzida. Para isso, camundongos fêmeas de 6 semanas foram imunussuprimidos e inoculados com C. albicans (107 células/mL). Em seguida, aplicou-se 100 mg/L de PDZ (diluído em salina ou hidrogel) na cavidade bucal por 20 min e o dorso lingual foi iluminado (37,5 J/cm² dose de luz). Animais adicionais foram tratados somente com LED ou PDZ. O grupo controle positivo não recebeu nenhum tratamento e, adicionalmente, animais saudáveis receberam tratamento com PDT (n=5). Em seguida, foi feita a recuperação do micro-organismo da língua dos animais. O número de colônias viáveis foi quantificado e os valores de UFC/mL foram determinados. Os animais foram sacrificados e as línguas foram removidas cirurgicamente para análise histológica. Duas colônias de cada animal foram isoladas da placa de cultura para avaliação dos fatores de virulência: adesão e formação de biofilme em superfície abiótica, formas filamentares de crescimento e produção de exoenzimas. Os dados foram analizados por ANOVA (P < 0,05). Os resultados demonstraram que a PDT resultou em redução significativa de C. albicans resistente a fluconazol (1,91 e 1,96 log10) em relação ao grupo controle positivo. Somente a aplicação da luz ou PDZ não reduziu a viabilidade celular. A PDT não ocasionou efeitos adversos no tecido lingual dos animais e reduziu apenas a produção de fosfolipase. A PDT foi efetiva na inativação da C. albicans resistente a fluconazol, sem causar efeitos adversos no tecido lingual.
This study evaluated the effects of Photodynamic Therapy (PDT), mediated by Photodithazine® (PDZ) and LED light, on fluconazole-resistant Candida albicans in a murine model of oral candidosis. For this, six-week-old female mice were immunosuppressed and inoculated with C. albicans (107 células/mL). Then, 100 mg/L of PDZ (diluted in saline or hydrogel) was applied on the oral cavity for 20 min and the dorsum of the tongue was illuminated (37.5 J/cm2 of fluence). The use of PDZ or light only was also investigated. Additionally, healthy animals received treatment with PDT. Positive control animals did not receive any treatment and negative control animals were not inoculated (n=5). After treatment the dorsum of the tongue was swabbed to recover C. albicans. The yeast colony counts were quantified and the number of CFU/mL was determined. The animals were killed and the tongues were surgically removed for histological analysis. Two yeast colony of each group were isolated from the culture plate for the evaluation of virulence factors: adhesion and biofilm formation in abiotic surface, filamentous forms of growth and production of exoenzymes. Data were analyzed by ANOVA (P < 0.05). PDT resulted in a significant reduction of fluconazole-resistant C. albicans (1.91 e 1.96 log10). The application of PDZ or LED only did not reduce the cell viability. PDT did not cause adverse effects in the local mucosa and it was able to reduce only phospholipase production. PDT was effective in the inactivation of fluconazole-resistant C. albicans without harming the tongue tissue.
This study evaluated the effects of Photodynamic Therapy (PDT), mediated by Photodithazine® (PDZ) and LED light, on fluconazole-resistant Candida albicans in a murine model of oral candidosis. For this, six-week-old female mice were immunosuppressed and inoculated with C. albicans (107 células/mL). Then, 100 mg/L of PDZ (diluted in saline or hydrogel) was applied on the oral cavity for 20 min and the dorsum of the tongue was illuminated (37.5 J/cm2 of fluence). The use of PDZ or light only was also investigated. Additionally, healthy animals received treatment with PDT. Positive control animals did not receive any treatment and negative control animals were not inoculated (n=5). After treatment the dorsum of the tongue was swabbed to recover C. albicans. The yeast colony counts were quantified and the number of CFU/mL was determined. The animals were killed and the tongues were surgically removed for histological analysis. Two yeast colony of each group were isolated from the culture plate for the evaluation of virulence factors: adhesion and biofilm formation in abiotic surface, filamentous forms of growth and production of exoenzymes. Data were analyzed by ANOVA (P < 0.05). PDT resulted in a significant reduction of fluconazole-resistant C. albicans (1.91 e 1.96 log10). The application of PDZ or LED only did not reduce the cell viability. PDT did not cause adverse effects in the local mucosa and it was able to reduce only phospholipase production. PDT was effective in the inactivation of fluconazole-resistant C. albicans without harming the tongue tissue.
Descrição
Palavras-chave
Fotoquimioterapia, Candida albicans, Protese
Como citar
ALVES, Fernanda. Estudo in vivo dos efeitos da terapia fotodinâmica, mediada pelo Photothazine® e luz led, sobre Cândida Albicans resistente a Fluconazol. 2013. 125 f. Dissertação (mestrado) Universidade Estadual Paulista Julio de Mesquita Filho, Faculdade de Odontologia de Araraquara, 2013.