title: Metergoline-induced cell death in Candida krusei.
abstract: Metergoline possesses potent antifungal activity against Candida krusei, a notorious yeast species that is inherently resistant to the common antifungal agents. In an attempt to elucidate the action mechanisms of metergoline, the present study was designed to investigate its effects on a number of classical markers of apoptosis in C. krusei. The results showed that transient exposure (2h) to metergoline led to a massive intracellular accumulation of reactive oxygen species (ROS) and depolarization of mitochondrial membrane potential in a concentration-dependent fashion. Analyses of the treated fungal cells after prolonged incubation (12h) with metergoline by flow cytometry and fluorescence microscopy clearly demonstrated phosphatidylserine externalization, the presence of terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end labelling-positive cells and fungal cells undergoing necrosis. Taken together, our data provide evidence that metergoline elicited cell death process in C. krusei through elevation of the intracellular ROS level and perturbation of mitochondrial homeostasis, followed by damage of nucleus and eventual cell demise.
authors.affiliation: Biochemistry Programme, School of Life Sciences, The Chinese University of Hong Kong, Hong Kong, China.
authors.forename: Kai
authors.initials: K
authors.lastname: Kang
authors.forename: Kin-Sing
authors.initials: KS
authors.lastname: Wong
authors.forename: Wing-Ping
authors.initials: WP
authors.lastname: Fong
authors.forename: Paul Wai-Kei
authors.initials: PW
authors.lastname: Tsang
mesh_terms: D000935:Antifungal Agents / Q000494:pharmacology*; D017209:Apoptosis / Q000187:drug effects*; D002175:Candida / Q000145:classification / Q000187:drug effects* / Q000648:ultrastructure; D002462:Cell Membrane / Q000187:drug effects; D053938:DNA Fragmentation; D005434:Flow Cytometry; D020287:In Situ Nick-End Labeling; D053078:Membrane Potential, Mitochondrial / Q000187:drug effects; D008711:Metergoline / Q000494:pharmacology*; D008826:Microbial Sensitivity Tests; D018613:Microscopy, Confocal; D009336:Necrosis / Q000139:chemically induced*; D017382:Reactive Oxygen Species / Q000378:metabolism
chemical_list: D000935:Antifungal Agents; D017382:Reactive Oxygen Species; D008711:Metergoline