title: Microbial alcohol-conferred hemolysis is a late response to alcohol stress.
abstract: We have reported previously that growth on alcohol vapors confers hemolytic properties on certain yeast species and strains ['microbial alcohol-conferred hemolysis' (MACH)]. In a recent study, we analyzed the genetic basis of MACH in Saccharomyces cerevisiae using the EUROSCARF mutant collection. The data suggested that intact mitochondrial and respiratory chain functions are critical for the observed alcohol-mediated hemolysis. We proposed that the uncontrolled cellular uptake of alcohol results in yeast 'hyper-respiration', leading to elaboration of hemolytic molecules such as hydrogen peroxide and lytic lipids. In the current study, we have further analyzed the molecular mechanisms involved in the MACH phenomenon in S. cerevisiae, using DNA microarrays. The patterns of regulation were confirmed by quantitative reverse transcriptase PCR. The results presented here lend further support to this hypothesis, based on upregulation of the genes responsible for coping with vast amounts of hydrogen peroxide produced as a byproduct of excessive oxidation of alcohol. These results, taken together, show that alcohol-mediated hemolysis in yeast appears to be related to the overproduction of hemolytic byproducts, particularly hydrogen peroxide, which accumulates during long-term exposure of S. cerevisiae to both ethanol and n-butanol.
authors.affiliation: Department of Clinical Microbiology and Immunology, Sackler Faculty of Medicine, The Maurice and Gabriela Goldschleger School of Dental Medicine, Tel-Aviv University, Ramat-Aviv, Israel.
authors.forename: Amir
authors.initials: A
authors.lastname: Shuster
authors.forename: Moshe
authors.initials: M
authors.lastname: Korem
authors.forename: Jasmine
authors.initials: J
authors.lastname: Jacob-Hirsch
authors.forename: Ninette
authors.initials: N
authors.lastname: Amariglio
authors.forename: Gideon
authors.initials: G
authors.lastname: Rechavi
authors.forename: Mel
authors.initials: M
authors.lastname: Rosenberg
mesh_terms: D020001:1-Butanol / Q000378:metabolism / Q000494:pharmacology*; D000431:Ethanol / Q000378:metabolism / Q000494:pharmacology*; D015870:Gene Expression / Q000187:drug effects; D015966:Gene Expression Regulation, Fungal / Q000187:drug effects*; D006861:Hydrogen Peroxide / Q000378:metabolism; D020411:Oligonucleotide Array Sequence Analysis; D018384:Oxidative Stress / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012441:Saccharomyces cerevisiae / Q000187:drug effects* / Q000235:genetics* / Q000378:metabolism; D013312:Stress, Physiological / Q000187:drug effects*
chemical_list: D000431:Ethanol; D020001:1-Butanol; D006861:Hydrogen Peroxide