Identification of a cell death pathway in Candida albicans during the response to pheromone.
Mating in hemiascomycete yeasts involves the secretion of pheromones that induce sexual differentiation in cells of the opposite mating type. Studies in Saccharomyces cerevisiae have revealed that a subpopulation of cells experiences cell death during exposure to pheromone. In this work, we tested whether the phenomenon of pheromone-induced death (PID) also occurs in the opportunistic pathogen Candida albicans. Mating in C. albicans is uniquely regulated by white-opaque phenotypic switching; both cell types respond to pheromone, but only opaque cells undergo the morphological transition and cell conjugation. We show that approximately 20% of opaque cells, but not white cells, of laboratory strain SC5314 experience pheromone-induced death. Furthermore, analysis of mutant strains revealed that PID was significantly reduced in strains lacking Fig1 or Fus1 transmembrane proteins that are induced during the mating process and, we now show, are necessary for efficient mating in C. albicans. The level of PID was also Ca(2+) dependent, as chelation of Ca(2+) ions increased cell death to almost 50% of the population. However, in contrast to S. cerevisiae PID, pheromone-induced killing of C. albicans cells was largely independent of signaling via the Ca(2+)-dependent protein phosphatase calcineurin, even when combined with the loss of Cmk1 and Cmk2 proteins. Finally, we demonstrate that levels of PID vary widely between clinical isolates of C. albicans, with some strains experiencing close to 70% cell death. We discuss these findings in light of the role of prodeath and prosurvival pathways operating in yeast cells undergoing the morphological response to pheromone.
Alby
Kevin
K
Department of Molecular Microbiology and Immunology, Brown University, Providence, RI 02912, USA.
Schaefer
Dana
D
Sherwood
Racquel Kim
RK
Jones
Stephen K
SK
Bennett
Richard J
RJ
D016282:Aspartic Acid Endopeptidases / Q000235:genetics / Q000502:physiology; D001483:Base Sequence; D020013:Calcium Signaling; D002176:Candida albicans / Q000166:cytology* / Q000187:drug effects* / Q000235:genetics / Q000502:physiology; D003227:Conjugation, Genetic; D004271:DNA, Fungal / Q000235:genetics; D005800:Genes, Fungal; D018841:HSP90 Heat-Shock Proteins / Q000235:genetics / Q000502:physiology; D006801:Humans; D066298:In Vitro Techniques; D000072235:Mating Factor; D008969:Molecular Sequence Data; D009154:Mutation; D010455:Peptides / Q000494:pharmacology; D010675:Pheromones / Q000494:pharmacology*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000502:physiology; D015398:Signal Transduction; D016559:Tacrolimus / Q000494:pharmacology
D004271:DNA, Fungal; C074510:HSP82 protein, S cerevisiae; D018841:HSP90 Heat-Shock Proteins; D010455:Peptides; D010675:Pheromones; D029701:Saccharomyces cerevisiae Proteins; D000072235:Mating Factor; D016282:Aspartic Acid Endopeptidases; C491999:BAR1 protein, S cerevisiae; D016559:Tacrolimus