Rapid detection of efflux pumps and their relation with drug resistance in yeast cells

• Autor(a) principal: Prudêncio, Cristina
• Data de Publicação: 2000
• Outros Autores: Sansonetty, Filipe, Sousa, Maria João, Côrte-Real, Manuela, Leão, Cecı́lia
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10400.22/23781
• topic: Active efflux pumps; Yeast drug resistance; Antimicrobial agents

Cell drug resistance can be due to the presence of active efflux pumps (AEP). Identification of yeast cells with a resistance phenotype is important either from a clinical, agricultural or biotechnological point of view. Rapid and reliable methods to detect AEP can be therefore very useful. Some yeast cells change their staining by cal-cein-AM, BCECF-AM, rhodamine 123 and DiOC5,when pretreated with verapamil, CCCP or ATP depletion, or when pretreated with specific antimicrobial agents. This fact may be interpreted as an indication of the presence/absence of AEP. Six yeast species were tested with a flowcytometric method (FCM) and an epifluorescence micro-scopic method (EFM), and ten other species were evalu-ated only by EFM. The minimum inhibitory concentration(MIC) of penconazol, benomyl and cycloheximide for Saccharomyces cerevisiae and Kluyveromyces marxia-nus, were determined by growth inhibition on solid me-dium and were compared to the staining changes de-tected by FCM. The FCM and the EFM allowed the detection of AEP in all the yeast species tested. High MIC values for adrug were related with the presence of at least one AEP indicated by the cytometric data. The FCM revealed to be a robust assay where as the EFM can be used as a preliminary test. It is possible to identify resistance/sensitivity patterns in yeast cells through cytometric detection methods of different efflux pumping systems.