Silver colloidal nanoparticles: effect on matrix composition and structure of Candida albicans and Candida glabrata biofilms

Autor(es)

Monteiro, D. R. ^{[1, 2]} ; Silva, S. ^[1] ; Negri, M. ^{[1, 3]} ; Gorup, L. F. ^[4] ; de Camargo, E. R. ^[4] ; Oliveira, R. ^[1] ; Barbosa, D. B. ^[2] ; Henriques, M. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Minho, Inst Biotechnol & Bioengn, Dept Biol Engn, P-4710057 Braga - Portugal

^[2] Univ Estadual Paulista UNESP, Aracatuba Dent Sch, Dept Dent Mat & Prosthodont, Aracatuba Sao Paulo - Brazil

^[3] Fac Inga, Maringa, Parana - Brazil

^[4] Fed Univ Sao Carlos UFSCar, LIEC Dept Chem, Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Applied Microbiology; v. 114, n. 4, p. 1175-1183, APR 2013.
• Citações Web of Science: 29

Resumo

Aim The aim of this study was to assess the effect of different silver nanoparticles (SN) concentrations on the matrix composition and structure of Candida albicans and Candida glabrata biofilms. Methods and Results Candida biofilms were developed in 6-well microtiter plates during 48h. After, these biofilms were exposed to 13 center dot 5 or 54gSNml1 for 24h. Then, extracellular matrices were extracted from biofilms and analysed chemically in terms of proteins, carbohydrates and DNA. To investigate the biofilm structure, scanning electron microscopy (SEM) and epifluorescence microscopy were used. SN interfered with the matrix composition of Candida biofilms tested in terms of protein, carbohydrate and DNA, except for the protein content of C.albicans biofilm. By SEM, Candida biofilms treated with SN revealed structural differences, when compared with the control groups. Further, SN showed a trend of agglomeration within the biofilms. Epifluorescence microscopy images suggest that SN induced damage on cell walls of the Candida isolates tested. Conclusions In general, irrespective of concentration, SN affected the matrix composition and structure of Candida biofilms and these findings may be related to the mechanisms of biocide action of SN. Significance and Impact of the Study This study reveals new insights about the behaviour of SN when in contact with Candida biofilms. SN may contribute to the development of therapies to prevent or control Candida infections. (AU)

• Processo FAPESP: 09/15146-5 - Análise da ação de nanopartículas de prata sobre o biofilme de espécies de Candida
• Beneficiário: Douglas Roberto Monteiro
• Modalidade de apoio: Bolsas no Brasil - Doutorado