Efeito da prometazina combinada aos antibióticos clássicos frente à forma planctônica e ao biofilme de Burkholderia pseudomallei

Detalhes bibliográficos
Ano de defesa: 2015
Autor(a) principal: Vasconcelos, David Caldas
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Não Informado pela instituição
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: http://www.repositorio.ufc.br/handle/riufc/21656
Resumo: Among the defense mechanisms employed by Burkholderia pseudomallei are the expression of efflux pumps such as BpeAB-OprB, AmrAB-OprA and BpeEF-OprC, which are responsible for resistance to aminoglycosides, macrolides, fluoroquinolones and sulfonamides. It is therefore necessary to find adjuvants able to minimize this resistance. In this context, the phenothiazines stand out for inhibiting those pumps. This study evaluated the in vitro inhibitory activity of promethazine alone or in combination with amoxicillin, amoxicillin/clavulanate, erythromycin, sulfamethoxazole/trimethoprim, ciprofloxacin or gentamicin against B. pseudomallei in planktonic and biofilm form. The structure of B. pseudomallei biofilm, with and without addition of promethazine, was also investigated. The sensitivity was evaluated by the broth microdilution test. The minimum inhibitory concentration (MIC) was 0.78 mg / mL and the minimum biofilm elimination concentration (MBEC) was 0.78 to 3.12 mg / mL for promethazine. Moreover, the association with promethazine significantly reduced the MIC values for erythromycin, trimethoprim / sulfamethoxazole, gentamicin and ciprofloxacin, whereas the MBEC values of all antibiotics tested significantly declined in combination with promethazine (p <0.05). Through electron and confocal microscopy, we found that promethazine was able to disrupt the biofilm matrix, possibly facilitating penetration of antibiotics. Therefore, this study demonstrates the inhibitory activity of promethazine against B. pseudomallei and its synergistic effect with traditional antibiotics against biofilms.