Detalhes bibliográficos
| Ano de defesa: |
2013 |
| Autor(a) principal: |
Manente, Francine Alessandra
 |
| Orientador(a): |
Vellosa, José Carlos Rebuglio
|
| Banca de defesa: |
Ghedini, Paulo César
,
Miyoshi, Edmar |
| Tipo de documento: |
Dissertação
|
| Tipo de acesso: |
Acesso aberto |
| Idioma: |
por |
| Instituição de defesa: |
UNIVERSIDADE ESTADUAL DE PONTA GROSSA
|
| Programa de Pós-Graduação: |
Programa de Pós Graduação Ciências Farmacêuticas
|
| Departamento: |
Farmacos, Medicamentos e Biociências Aplicadas à Farmácia
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| País: |
BR
|
| Palavras-chave em Português: |
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| Palavras-chave em Inglês: |
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| Área do conhecimento CNPq: |
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| Link de acesso: |
http://tede2.uepg.br/jspui/handle/prefix/105
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Resumo: |
Amphotericin B (AmB) is drug "gold standard" for the treatment of invasive fungal infections since 1960. However, amphotericin B has high toxicity, which manifests itself most commonly in the kidneys (nephrotoxicity) and less frequently in the liver (liver toxicity). It is known since 1985 that self-oxidation of amphotericin B gives different forms of reactive oxidative species and these are responsible in part by toxicity. An antioxidant, such as hesperidin and rutin, could contribute, through the reduction of oxidative stress, and to protect against renal injury generated by ischemia. This fact and the involvement of amphotericin B in the generation of free radicals make it interesting to evaluate the effect of hesperidin, rutin and amphotericin B (alone or associated) against reactive oxygen species and free radicals, as well as the study of the same models in toxicity . In testing the antifungal combination with hesperidin showed synergism. In tests oxidative systems, opposite the ABTS+, the hesperidin showed IC50= 0,0044mg/mL, rutin IC50=0,0023mg/mL and amphotericin B IC50=0,0124mg/mL (isolated), IC50=0,0003mg/mL (associated with hesperidin) and IC50=0,0014mg/mL (associated with rutin). In the DPPH assay only rutin was action. Front HOCl, hesperidin showed IC50=0,0109, rutin IC50=0,0025 and amphotericin B showed IC50=0,0056 (isolated) IC50=0,0023mg/mL (associated with hesperidin) and IC50=0,0036 (associated with rutin). In the trial with O2 the samples were not effective. In inhibition kinetics MPO/H2O2/Guaiacol only rutin promote inhibition. Front to erythrocytes, amphotericin promoted lysis in a dose-dependent manner. HUVEC cells using the associations decreased cell viability. However, in the toxicity test with Artemia salina associated samples were able to lower the toxicity of amphotericin B. To conclude, in tests with animals amphotericin B caused leukopenia, monopenia generated and renal damage, which can be reversed using hesperidin in combination. With these results, we suggest that the combination of a natural product with amphotericin B could decrease the toxicity caused by this antinfúngico, and concomitant use could be promising. |
