Programa de Pós-graduação em Biologia da Relação Parasito-Hospedeiro
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Navegando Programa de Pós-graduação em Biologia da Relação Parasito-Hospedeiro por Por Orientador "Costa, Carolina Rodrigues"
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Item Atividade de compostos naturais e sintéticos na presença de espécies de Candida(Universidade Federal de Goiás, 2017-02-09) Andrade, Fernanda Almeida; Costa, Carolina Rodrigues; http://lattes.cnpq.br/2503738140054176; Costa, Carolina Rodrigues; Silva, Maria do Rosário Rodrigues; Oliveira, Valéria de; Passos, Xisto Sena; Costa, Maysa Paula daInfections caused by yeasts of the genus Candida are called candidiasis and are considered opportunistic diseases with characteristics ranging from superficial to disseminate. Candida species may develop defense mechanisms to the major antifungal agents available for clinical use against infections, making it difficult and limiting treatment. Natural products can be a source of bioactive compounds against infectious diseases, such as the Curcuma longa Linn or saffron plant as it is popularly known that it has the compound curcumin. This vegetable is used in large scale by the population as food condiment and as natural medicine against inflammatory diseases and infectious diseases. Laboratory-synthesized compounds have been to interest in medical biotechnology, among which the hydrazone derivatives are associated with antimicrobial including antifungal, antioxidant, antiparasitic, anticonvulsive, analgesic, anti-inflammatory and antitumor activity. The objectives were to determine the minimum inhibitory concentration (MIC) and minimum fungicidal concentration (MFC) of curcumin and n-acylhydrazone compounds, and also to verify the time-kill curve of Candida, to quantify ergosterol and to evaluate hemolysis of red blood cells after action of both compounds. Twenty isolates Candida spp. in the broth microdilution test for evaluation of the MIC and MFC of the compounds. The time-kill curve and ergosterol assay were checked after treatment of C. albicans ATCC 28367 with the compounds. To evaluate the cytotoxicity of these compounds sheep red blood cells were used. The compound curcumin showed MIC values between 16 and 256 μg/mL and MFC between 128 and values greater than 512 μg/mL. For the n-acylhydrazone derivative the MIC values ranged from 2 to 128 μg/mL and the MFC variation ranged from 256 to values greater than 512 μg/mL. The compounds showed fungistatic action on the growth kinetics of Candida over 48 hours. The determination of ergosterol after contact with the agents in MIC of 64 μg/mL of curcumin and 16 μg/mL of nacylhydrazone was reduced by 29.56 and 53.57%, respectively. The compounds showed hemolytic activity at concentrations of 512 μg/mL. The results observed in this work show that the curcumin and the n- acylhydrazone derivative have promising antifungal properties.Item Identificação das espécies de Candida, avaliação da ultraestrutura e perfil de suscetibilidade de biofilmes aos antifúngicos(Universidade Federal de Goiás, 2014-05-08) Marreto, Lais Carneiro Naziasene Lima; Costa, Carolina Rodrigues; http://lattes.cnpq.br/2503738140054176; Costa, Carolina Rodrigues; Silva, Maria do Rosário Rodrigues da; Jesuino, Rosália Santos AmorimThe increase in the number of fungal infections by Candida species, as a result of the significant increase of immunocompromised patients emphasizes the importance of studies associated to this genre. The resistance of these strains to antifungal drugs is observe in specific isolates, as well as infections associated with biofilm formation (BF). The aim of this study was to compare the susceptibility profile of sessile and planktonic cells of different Candida isolates, differentiating species by multiplex qPCR and scanning electron microscopy. The sample consisted of 10 C. albicans, 10 C. parapsilosis and 1 C. tropicalis. The genetic material was extracted by phenolchloroform extraction of the sample C. tropicalis, ATCC 28367 (C. albicans) and ATCC 22019 (C. parapsilosis) for use in a species-specific multiplex qPCR assay with analysis of differences in the curve fusion. Microdilution plate test and reduction of the tetrazolium salt for 21 isolates were performed for the susceptibility of sessile and free cells, respectively. The evaluation of the ultrastructure of the biofilm was performed on strips of polyurethane with visualization by scanning electron microscopy. The amplified products from C. albicans obtained three melting peaks with values of 75,2 °C, 76,8 °C and 79,8 °C, while C. tropicalis and C. parapsilosis showed one peak with values 73,5 °C and 78,5 °C, respectively. The identification test showed to be reliable for the identification of the most common species in the study. All of Candida yeasts were able to form biofilm with own organization of each specie. The in vitro susceptibility test of planktonic cells demonstrated that amphotericin B and caspofungin showed better activity compared to fluconazole and voriconazole who obtained 19% of resistant strains, all C. albicans. In assessing of the CIMs50% and CIMs80% of sessile cells, we observed an increase of at least 60 times the values of planktonic cells. It was observed a high percentage of BF that demonstrates the need for diagnosis and combat against this biomass formed by Candida species. The BF is a virulence factor determinant for decrease of susceptibility to antifungal agents thus compromising antifungal therapy.