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Antifungal Activity of 14-Helical ?-Peptides against Planktonic Cells and Biofilms of Candida Species #MMPMID26287212
Raman N; Lee MR; Lynn DM; Palecek SP
Pharmaceuticals (Basel) 2015[Sep]; 8 (3): 483-503 PMID26287212show ga
Candida albicans is the most prevalent cause of fungal infections and treatment is further complicated by the formation of drug resistant biofilms, often on the surfaces of implanted medical devices. In recent years, the incidence of fungal infections by other pathogenic Candida species such as C. glabrata, C. parapsilosis and C. tropicalis has increased. Amphiphilic, helical ?-peptide structural mimetics of natural antimicrobial ?-peptides have been shown to exhibit specific planktonic antifungal and anti-biofilm formation activity against C. albicans in vitro. Here, we demonstrate that ?-peptides are also active against clinically isolated and drug resistant strains of C. albicans and against other opportunistic Candida spp. Different Candida species were susceptible to ?-peptides to varying degrees, with C. tropicalis being the most and C. glabrata being the least susceptible. ?-peptide hydrophobicity directly correlated with antifungal activity against all the Candida clinical strains and species tested. While ?-peptides were largely ineffective at disrupting existing Candida biofilms, hydrophobic ?-peptides were able to prevent the formation of C. albicans, C. glabrata, C. parapsilosis and C. tropicalis biofilms. The broad-spectrum antifungal activity of ?-peptides against planktonic cells and in preventing biofilm formation suggests the promise of this class of molecules as therapeutics.