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Ramesh S, Roy U, Roy S, Rudramurthy SM. A promising antifungal lipopeptide from Bacillus subtilis: its characterization and insight into the mode of action. Appl Microbiol Biotechnol 2024; 108:161. [PMID: 38252130 DOI: 10.1007/s00253-023-12976-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 11/20/2023] [Accepted: 11/27/2023] [Indexed: 01/23/2024]
Abstract
Emerging resistance of fungal pathogens and challenges faced in drug development have prompted renewed investigations into novel antifungal lipopeptides. The antifungal lipopeptide AF3 reported here is a natural lipopeptide isolated and purified from Bacillus subtilis. The AF3 lipopeptide's secondary structure, functional groups, and the presence of amino acid residues typical of lipopeptides were determined by circular dichroism, Fourier transform infrared spectroscopy, and nuclear magnetic resonance spectroscopy. The lipopeptide's low minimum inhibitory concentrations (MICs) of 4-8 mg/L against several fungal strains demonstrate its strong antifungal activity. Biocompatibility assays showed that ~ 80% of mammalian cells remained viable at a 2 × MIC concentration of AF3. The treated Candida albicans cells examined by scanning electron microscopy, transmission electron microscopy, and atomic force microscopy clearly showed ultrastructural alterations such as the loss of the cell shape and cell membrane integrity. The antifungal effect of AF3 resulted in membrane permeabilization facilitating the uptake of the fluorescent dyes-acridine orange (AO)/propidium iodide (PI) and FUN-1. Using 1,6-diphenyl-1,3,5-hexatriene (DPH) and 4-(2-[6-(dioctylamino)-2-naphthalenyl] ethenyl)-1-(3-sulfopropyl) pyridinium inner salt (di-8-ANEPPS), we observed that the binding of AF3 to the membrane bilayer results in membrane disruption and depolarization. Flow cytometry analyses revealed a direct correlation between lipopeptide activity, membrane permeabilization (~ 75% PI uptake), and reduced cell viability. An increase in 2',7'-dichlorodihydrofluorescein diacetate (DCFH-DA) fluorescence demonstrates endogenous reactive oxygen species production. Lipopeptide treatment appears to induce late-stage apoptosis and alterations to nuclear morphology, suggesting that AF3-induced membrane damage may lead to a cellular stress response. Taken together, this study illustrates antifungal lipopeptide's potential as an antifungal drug candidate. KEY POINTS: • The studied lipopeptide variant AF3 displayed potent antifungal activity against C. albicans • Its biological activity was stable to proteolysis • Analytical studies demonstrated that the lipopeptide is essentially membranotropic and able to cause membrane dysfunction, elevated ROS levels, apoptosis, and DNA damage.
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Affiliation(s)
- Swetha Ramesh
- Department of Biological Sciences, BITS Pilani K.K. Birla Goa Campus, NH 17B Bypass Road, Sancoale, Goa, 403726, India
| | - Utpal Roy
- Department of Biological Sciences, BITS Pilani K.K. Birla Goa Campus, NH 17B Bypass Road, Sancoale, Goa, 403726, India.
| | - Subhasish Roy
- Department of Chemistry, BITS Pilani K.K. Birla Goa Campus, NH 17B Bypass Road, Sancoale, Goa, 403726, India
| | - Shivaprakash M Rudramurthy
- Department of Medical Microbiology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
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Cho O, Takada S, Odaka T, Futamura S, Kurakado S, Sugita T. Tacrolimus (FK506) Exhibits Fungicidal Effects against Candida parapsilosis Sensu Stricto via Inducing Apoptosis. J Fungi (Basel) 2023; 9:778. [PMID: 37504766 PMCID: PMC10381508 DOI: 10.3390/jof9070778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 07/18/2023] [Accepted: 07/19/2023] [Indexed: 07/29/2023] Open
Abstract
Tacrolimus (FK506), an immunosuppressant and calcineurin inhibitor, has fungicidal effects. However, its fungicidal effect is thought to be limited to basidiomycetes, such as Cryptococcus and Malassezia, and not to ascomycetes. FK506 had no fungicidal effect on Candida albicans, C. auris, C. glabrata, C. guilliermondii, C. kefyr, C. krusei, and C. tropicalis (>8 µg/mL); however, C. parapsilosis was susceptible to it at low concentrations of 0.125-0.5 µg/mL. C. metapsilosis and C. orthopsils, previously classified as C. parapsilosis, are molecularly and phylogenetically closely related to C. parapsilosis, but neither species was sensitive to FK506. FK506 increased the mitochondrial reactive oxygen species production and cytoplasmic and mitochondrial calcium concentration and activated metacaspases, nuclear condensation, and DNA fragmentation, suggesting that it induced mitochondria-mediated apoptosis in C. parapsilosis. Elucidating why FK506 exhibits fungicidal activity only against C. parapsilosis will provide new information for developing novel antifungal drugs.
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Affiliation(s)
- Otomi Cho
- Department of Microbiology, Meiji Pharmaceutical University, Noshio, Kiyose 204-8588, Japan
| | - Shintaro Takada
- Department of Microbiology, Meiji Pharmaceutical University, Noshio, Kiyose 204-8588, Japan
| | - Takahiro Odaka
- Department of Microbiology, Meiji Pharmaceutical University, Noshio, Kiyose 204-8588, Japan
| | - Satoshi Futamura
- Department of Microbiology, Meiji Pharmaceutical University, Noshio, Kiyose 204-8588, Japan
| | - Sanae Kurakado
- Department of Microbiology, Meiji Pharmaceutical University, Noshio, Kiyose 204-8588, Japan
| | - Takashi Sugita
- Department of Microbiology, Meiji Pharmaceutical University, Noshio, Kiyose 204-8588, Japan
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3
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Whole and Purified Aqueous Extracts of Nigella sativa L. Seeds Attenuate Apoptosis and the Overproduction of Reactive Oxygen Species Triggered by p53 Over-Expression in the Yeast Saccharomyces cerevisiae. Cells 2022; 11:cells11050869. [PMID: 35269491 PMCID: PMC8909299 DOI: 10.3390/cells11050869] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Revised: 02/24/2022] [Accepted: 02/28/2022] [Indexed: 02/04/2023] Open
Abstract
Plants are an important source of pharmacologically active compounds. In the present work, we characterize the impact of black cumin (Nigella sativa L.) aqueous extracts on a yeast model of p53-dependent apoptosis. To this end, the Saccharomyces cerevisiae recombinant strain over-expressing p53 was used. The over-expression of p53 triggers the expression of apoptotic markers: the externalization of phosphatidylserine, mitochondrial defect associated with cytochrome-c release and the induction of DNA strand breaks. These different effects were attenuated by Nigella sativa L. aqueous extracts, whereas these extracts have no effect on the level of p53 expression. Thus, we focus on the anti-apoptotic molecules present in the aqueous extract of Nigella sativa L. These extracts were purified and characterized by complementary chromatographic methods. Specific fluorescent probes were used to determine the effect of the extracts on yeast apoptosis. Yeast cells over-expressing p53 decrease in relative size and have lower mitochondrial content. The decrease in cell size was proportional to the decrease in mitochondrial content and of mitochondrial membrane potential (ΔΨm). These effects were prevented by the purified aqueous fraction obtained by fractionation with different columns, named C4 fraction. Yeast cell death was also characterized by reactive oxygen species (ROS) overproduction. In the presence of the C4 fraction, ROS overproduction was strongly reduced. We also noted that the C4 fraction promotes the cell growth of control yeast cells, which do not express p53, supporting the fact that this purified extract acts on cellular mediators activating cell proliferation independently of p53. Altogether, our data obtained on yeast cells over-expressing p53 demonstrate that anti-apoptotic molecules targeting p53-induced apoptosis associated with mitochondrial dysfunction and ROS overproduction are present in the aqueous extracts of Nigella seeds and in the purified aqueous C4 fraction.
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Mbuayama KR, Taute H, Strӧmstedt AA, Bester MJ, Gaspar ARM. Antifungal activity and mode of action of synthetic peptides derived from the tick OsDef2 defensin. J Pept Sci 2021; 28:e3383. [PMID: 34866278 DOI: 10.1002/psc.3383] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Revised: 10/28/2021] [Accepted: 11/08/2021] [Indexed: 01/29/2023]
Abstract
Candida albicans is the principal opportunistic fungal pathogen in nosocomial settings and resistance to antifungal drugs is on the rise. Antimicrobial peptides from natural sources are promising novel therapeutics against C. albicans. OsDef2 defensin was previously found to be active against only Gram-positive bacteria, whereas derived fragments Os and its cysteine-free analogue, Os-C, are active against Gram-positive and Gram-negative bacteria at low micromolar concentrations. In this study, OsDef2-derived analogues and fragments were screened for anticandidal activity with the aim to identify peptides with antifungal activity and in so doing obtain a better understanding of the structural requirements for activity and modes of action. Os, Os-C and Os(11-22)NH2 , a Os-truncated carboxy-terminal-amidated fragment, had the most significant antifungal activities, with minimum fungicidal concentrations (MFCs) in the micromolar range (6-28 μM). C. albicans killing was rapid and occurred within 30-60 min. Further investigations showed all three peptides interacted with cell wall derived polysaccharides while both Os and Os(11-22)NH2 permeabilized fungal liposomes. Confocal laser scanning microscopy confirmed that Os-C and Os(11-22)NH2 could enter the cytosol of live cells and subsequent findings suggest that the uptake of Os and Os-C, in contrast to Os(11-22)NH2 , is energy dependent. Although Os, Os-C and Os(11-22)NH2 induced the production of reactive oxygen species (ROS), co-incubation with ascorbic acid revealed that only ROS generated by Os-C and to a lesser extent Os(11-22)NH2 resulted in cell death. Overall, Os, Os-C and Os(11-22)NH2 are promising candidacidal agents.
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Affiliation(s)
- Kabuzi R Mbuayama
- Department of Biochemistry, Genetics and Microbiology, Faculty of Natural and Agricultural Sciences, University of Pretoria, Pretoria, South Africa
| | - Helena Taute
- Department of Anatomy, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa
| | - Adam A Strӧmstedt
- Pharmacognosy, Department of Pharmaceutical Biosciences, Uppsala University, Uppsala, Sweden
| | - Megan J Bester
- Department of Anatomy, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa
| | - Anabella R M Gaspar
- Department of Biochemistry, Genetics and Microbiology, Faculty of Natural and Agricultural Sciences, University of Pretoria, Pretoria, South Africa
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Chen YC, Yang Y, Zhang C, Chen HY, Chen F, Wang KJ. A Novel Antimicrobial Peptide Sparamosin 26-54 From the Mud Crab Scylla paramamosain Showing Potent Antifungal Activity Against Cryptococcus neoformans. Front Microbiol 2021; 12:746006. [PMID: 34690992 PMCID: PMC8531530 DOI: 10.3389/fmicb.2021.746006] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Accepted: 09/17/2021] [Indexed: 11/20/2022] Open
Abstract
Due to the increasing prevalence of drug-resistant fungi and the limitations of current treatment strategies to fungal infections, exploration and development of new antifungal drugs or substituents are necessary. In the study, a novel antimicrobial peptide, named Sparamosin, was identified in the mud crab Scylla paramamosain, which contains a signal peptide of 22 amino acids and a mature peptide of 54 amino acids. The antimicrobial activity of its synthetic mature peptide and two truncated peptides (Sparamosin1-25 and Sparamosin26-54) were determined. The results showed that Sparamosin26-54 had the strongest activity against a variety of Gram-negative bacteria, Gram-positive bacteria and fungi, in particular had rapid fungicidal kinetics (killed 99% Cryptococcus neoformans within 10 min) and had potent anti-biofilm activity against C. neoformans, but had no cytotoxic effect on mammalian cells. The RNA-seq results showed that after Sparamosin26-54 treatment, the expression of genes involved in cell wall component biosynthesis, cell wall integrity signaling pathway, anti-oxidative stress, apoptosis and DNA repair were significantly up-regulated, indicating that Sparamosin26-54 might disrupt the cell wall of C. neoformans, causing oxidative stress, DNA damage and cell apoptosis. The underlying mechanism was further confirmed. Sparamosin26-54 could bind to several phospholipids in the cell membrane and effectively killed C. neoformans through disrupting the integrity of the cell wall and cell membrane observed by electron microscope and staining assay. In addition, it was found that the accumulation of reactive oxygen species (ROS) increased, the mitochondrial membrane potential (MMP) was disrupted, and DNA fragmentation was induced after Sparamosin26-54 treatment, which are all hallmarks of apoptosis. Taken together, Sparamosin26-54 has a good application prospect as an effective antimicrobial agent, especially for C. neoformans infections.
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Affiliation(s)
- Yan-Chao Chen
- State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen, China
| | - Ying Yang
- State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen, China
| | - Chang Zhang
- State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen, China
| | - Hui-Yun Chen
- State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen, China
- State-Province Joint Engineering Laboratory of Marine Bioproducts and Technology, College of Ocean and Earth Sciences, Xiamen University, Xiamen, China
- Fujian Innovation Research Institute for Marine Biological Antimicrobial Peptide Industrial Technology, College of Ocean and Earth Sciences, Xiamen University, Xiamen, China
| | - Fangyi Chen
- State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen, China
- State-Province Joint Engineering Laboratory of Marine Bioproducts and Technology, College of Ocean and Earth Sciences, Xiamen University, Xiamen, China
- Fujian Innovation Research Institute for Marine Biological Antimicrobial Peptide Industrial Technology, College of Ocean and Earth Sciences, Xiamen University, Xiamen, China
| | - Ke-Jian Wang
- State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen, China
- State-Province Joint Engineering Laboratory of Marine Bioproducts and Technology, College of Ocean and Earth Sciences, Xiamen University, Xiamen, China
- Fujian Innovation Research Institute for Marine Biological Antimicrobial Peptide Industrial Technology, College of Ocean and Earth Sciences, Xiamen University, Xiamen, China
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Rollin-Pinheiro R, Almeida YDC, Rochetti VP, Xisto MIDDS, Borba-Santos LP, Rozental S, Barreto-Bergter E. Miltefosine Against Scedosporium and Lomentospora Species: Antifungal Activity and Its Effects on Fungal Cells. Front Cell Infect Microbiol 2021; 11:698662. [PMID: 34368017 PMCID: PMC8343104 DOI: 10.3389/fcimb.2021.698662] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Accepted: 07/05/2021] [Indexed: 01/03/2023] Open
Abstract
Scedosporium and Lomentospora species are filamentous fungi responsible for a wide range of infections in humans and are frequently associated with cystic fibrosis and immunocompromising conditions. Because they are usually resistant to many antifungal drugs available in clinical settings, studies of alternative targets in fungal cells and therapeutic approaches are necessary. In the present work, we evaluated the in vitro antifungal activity of miltefosine against Scedosporium and Lomentospora species and how this phospholipid analogue affects the fungal cell. Miltefosine inhibited different Scedosporium and Lomentospora species at 2–4 µg/ml and reduced biofilm formation. The loss of membrane integrity in Scedosporium aurantiacum caused by miltefosine was demonstrated by leakage of intracellular components and lipid raft disorganisation. The exogenous addition of glucosylceramide decreased the inhibitory activity of miltefosine. Reactive oxygen species production and mitochondrial activity were also affected by miltefosine, as well as the susceptibility to fluconazole, caspofungin and myoricin. The data obtained in the present study contribute to clarify the dynamics of the interaction between miltefosine and Scedosporium and Lomentospora cells, highlighting its potential use as new antifungal drug in the future.
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Affiliation(s)
- Rodrigo Rollin-Pinheiro
- Departamento de Microbiologia Geral, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Yuri de Castro Almeida
- Departamento de Microbiologia Geral, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Victor Pereira Rochetti
- Departamento de Microbiologia Geral, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Mariana Ingrid Dutra da Silva Xisto
- Departamento de Microbiologia Geral, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Luana Pereira Borba-Santos
- Programa de Biologia Celular e Parasitologia, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Sonia Rozental
- Programa de Biologia Celular e Parasitologia, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Eliana Barreto-Bergter
- Departamento de Microbiologia Geral, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
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7
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Meza E, Muñoz-Arellano AJ, Johansson M, Chen X, Petranovic D. Development of a method for heat shock stress assessment in yeast based on transcription of specific genes. Yeast 2021; 38:549-565. [PMID: 34182606 DOI: 10.1002/yea.3658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Revised: 05/22/2021] [Accepted: 06/22/2021] [Indexed: 11/11/2022] Open
Abstract
All living cells, including yeast cells, are challenged by different types of stresses in their environments and must cope with challenges such as heat, chemical stress, or oxidative damage. By reversibly adjusting the physiology while maintaining structural and genetic integrity, cells can achieve a competitive advantage and adapt environmental fluctuations. The yeast Saccharomyces cerevisiae has been extensively used as a model for study of stress responses due to the strong conservation of many essential cellular processes between yeast and human cells. We focused here on developing a tool to detect and quantify early responses using specific transcriptional responses. We analyzed the published transcriptional data on S. cerevisiae DBY strain responses to 10 different stresses in different time points. The principal component analysis (PCA) and the Pearson analysis were used to assess the stress response genes that are highly expressed in each individual stress condition. Except for these stress response genes, we also identified the reference genes in each stress condition, which would not be induced under stress condition and show stable transcriptional expression over time. We then tested our candidates experimentally in the CEN.PK strain. After data analysis, we identified two stress response genes (UBI4 and RRP) and two reference genes (MEX67 and SSY1) under heat shock (HS) condition. These genes were further verified by real-time PCR at mild (42°C), severe (46°C), to lethal temperature (50°C), respectively.
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Affiliation(s)
- Eugenio Meza
- Division of Systems and Synthetic Biology, Department of Biology and Biological Engineering, Chalmers University of Technology, Gothenburg, Sweden
| | - Ana Joyce Muñoz-Arellano
- Division of Systems and Synthetic Biology, Department of Biology and Biological Engineering, Chalmers University of Technology, Gothenburg, Sweden
| | - Magnus Johansson
- Division of Systems and Synthetic Biology, Department of Biology and Biological Engineering, Chalmers University of Technology, Gothenburg, Sweden
| | - Xin Chen
- Division of Systems and Synthetic Biology, Department of Biology and Biological Engineering, Chalmers University of Technology, Gothenburg, Sweden.,Novo Nordisk Foundation Center for Biosustainability, Chalmers University of Technology, Gothenburg, Sweden
| | - Dina Petranovic
- Division of Systems and Synthetic Biology, Department of Biology and Biological Engineering, Chalmers University of Technology, Gothenburg, Sweden
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8
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Human hepatitis A virus 3C protease exerts a cytostatic effect on Saccharomyces cerevisiae and affects the vacuolar compartment. Biologia (Bratisl) 2021. [DOI: 10.2478/s11756-020-00569-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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9
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Antifungal Effect of A Chimeric Peptide Hn-Mc against Pathogenic Fungal Strains. Antibiotics (Basel) 2020; 9:antibiotics9080454. [PMID: 32731574 PMCID: PMC7460001 DOI: 10.3390/antibiotics9080454] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 07/24/2020] [Accepted: 07/25/2020] [Indexed: 11/17/2022] Open
Abstract
It is difficult to identify new antifungal agents because of their eukaryotic nature. However, antimicrobial peptides can well differentiate among cell types owing to their variable amino acid content. This study aimed to investigate the antifungal effect of Hn-Mc, a chimeric peptide comprised of the N-terminus of HPA3NT3 and the C-terminus of melittin. We evaluated its potent antifungal activity at low minimal inhibitory concentrations (MICs) ranging from 1–16 μM against pathogenic yeast and molds. The cell-type specificity of Hn-Mc was mediated through the formation of a random α-helical structure to mimic the fungal membrane environment. Furthermore, Hn-Mc caused cell death in C. tropicalis and F. oxysporum by inducing apoptosis via the generation of reactive oxygen species (ROS) due to mitochondrial damage. The present results indicate that Hn-Mc has a high affinity for the fungal plasma membrane and induces apoptosis in fungal cells, and provide guidance for the development of new antifungal agents.
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Matbaechi Ettehad H, Soltani Zarrin P, Hölzel R, Wenger C. Dielectrophoretic Immobilization of Yeast Cells Using CMOS Integrated Microfluidics. MICROMACHINES 2020; 11:E501. [PMID: 32429098 PMCID: PMC7281093 DOI: 10.3390/mi11050501] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 05/12/2020] [Accepted: 05/13/2020] [Indexed: 01/28/2023]
Abstract
This paper presents a dielectrophoretic system for the immobilization and separation of live and dead cells. Dielectrophoresis (DEP) is a promising and efficient investigation technique for the development of novel lab-on-a-chip devices, which characterizes cells or particles based on their intrinsic and physical properties. Using this method, specific cells can be isolated from their medium carrier or the mixture of cell suspensions (e.g., separation of viable cells from non-viable cells). Main advantages of this method, which makes it favorable for disease (blood) analysis and diagnostic applications are, the preservation of the cell properties during measurements, label-free cell identification, and low set up cost. In this study, we validated the capability of complementary metal-oxide-semiconductor (CMOS) integrated microfluidic devices for the manipulation and characterization of live and dead yeast cells using dielectrophoretic forces. This approach successfully trapped live yeast cells and purified them from dead cells. Numerical simulations based on a two-layer model for yeast cells flowing in the channel were used to predict the trajectories of the cells with respect to their dielectric properties, varying excitation voltage, and frequency.
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Affiliation(s)
- Honeyeh Matbaechi Ettehad
- IHP–Leibniz-Institut für innovative Mikroelektronik, Im Technologiepark 25, 15236 Frankfurt/Oder, Germany; (P.S.Z.); (C.W.)
| | - Pouya Soltani Zarrin
- IHP–Leibniz-Institut für innovative Mikroelektronik, Im Technologiepark 25, 15236 Frankfurt/Oder, Germany; (P.S.Z.); (C.W.)
| | - Ralph Hölzel
- Fraunhofer Institute for Cell Therapy and Immunology, Branch Bioanalytics and Bioprocesses (IZI-BB), 14476 Potsdam-Golm, Germany;
| | - Christian Wenger
- IHP–Leibniz-Institut für innovative Mikroelektronik, Im Technologiepark 25, 15236 Frankfurt/Oder, Germany; (P.S.Z.); (C.W.)
- BTU Cottbus-Senftenberg, 03046 Cottbus, Germany
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11
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Zimmermann A, Tadic J, Kainz K, Hofer SJ, Bauer MA, Carmona-Gutierrez D, Madeo F. Transcriptional and epigenetic control of regulated cell death in yeast. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2020; 352:55-82. [PMID: 32334817 DOI: 10.1016/bs.ircmb.2019.12.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Unicellular organisms like yeast can undergo controlled demise in a manner that is partly reminiscent of mammalian cell death. This is true at the levels of both mechanistic and functional conservation. Yeast offers the combination of unparalleled genetic amenability and a comparatively simple biology to understand both the regulation and evolution of cell death. In this minireview, we address the capacity of the nucleus as a regulatory hub during yeast regulated cell death (RCD), which is becoming an increasingly central question in yeast RCD research. In particular, we explore and critically discuss the available data on stressors and signals that specifically impinge on the nucleus. Moreover, we also analyze the current knowledge on nuclear factors as well as on transcriptional control and epigenetic events that orchestrate yeast RCD. Altogether we conclude that the functional significance of the nucleus for yeast RCD in undisputable, but that further exploration beyond correlative work is necessary to disentangle the role of nuclear events in the regulatory network.
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Affiliation(s)
- Andreas Zimmermann
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, Graz, Austria
| | - Jelena Tadic
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, Graz, Austria; Division of Immunology and Pathophysiology, Otto Loewi Research Center, Medical University of Graz, Graz, Austria
| | - Katharina Kainz
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, Graz, Austria
| | - Sebastian J Hofer
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, Graz, Austria
| | - Maria A Bauer
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, Graz, Austria
| | | | - Frank Madeo
- Institute of Molecular Biosciences, NAWI Graz, University of Graz, Graz, Austria; BioTechMed Graz, Graz, Austria.
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12
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Valiakhmetov AY, Kuchin AV, Suzina NE, Zvonarev AN, Shepelyakovskaya AO. Glucose causes primary necrosis in exponentially grown yeast Saccharomyces cerevisiae. FEMS Yeast Res 2019; 19:5347945. [PMID: 30785621 DOI: 10.1093/femsyr/foz019] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Accepted: 02/19/2019] [Indexed: 02/07/2023] Open
Abstract
In this paper, we present data on sugar-induced cell death (SICD) in the yeast Saccharomyces cerevisiae in the exponential phase of growth. We suggest that the nature of SICD in exponentially grown yeast is primary necrosis, in contrast to cells in the stationary growth phase, which exhibit apoptotic SICD. The following findings confirm this conclusion: (i) the process rate; (ii) the impairments of plasma membrane integrity; (iii) the drastic morphological changes in the intracellular content; (iv) the absence of chromatin condensation; (v) the absence of externalization of phosphotidylserine (PS) on the outer leaflet of plasma membrane and (vi) the insensitivity of the SICD process to cycloheximide (CHX). Research shows that SICD occurs in a subpopulation of cells in the S-phase.
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Affiliation(s)
- A Ya Valiakhmetov
- Skryabin Institute of Biochemistry and Physiology of Microorganisms, FRC PCBR RAS.,Moscow Region State University
| | - A V Kuchin
- Institute of Cell Biophysics, FRC PCBR RAS
| | - N E Suzina
- Skryabin Institute of Biochemistry and Physiology of Microorganisms, FRC PCBR RAS
| | - A N Zvonarev
- Skryabin Institute of Biochemistry and Physiology of Microorganisms, FRC PCBR RAS
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13
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Baghban R, Farajnia S, Rajabibazl M, Ghasemi Y, Mafi A, Hoseinpoor R, Rahbarnia L, Aria M. Yeast Expression Systems: Overview and Recent Advances. Mol Biotechnol 2019; 61:365-384. [PMID: 30805909 DOI: 10.1007/s12033-019-00164-8] [Citation(s) in RCA: 98] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Yeasts are outstanding hosts for the production of functional recombinant proteins with industrial or medical applications. Great attention has been emerged on yeast due to the inherent advantages and new developments in this host cell. For the production of each specific product, the most appropriate expression system should be identified and optimized both on the genetic and fermentation levels, considering the features of the host, vector and expression strategies. Currently, several new systems are commercially available; some of them are private and need licensing. The potential for secretory expression of heterologous proteins in yeast proposed this system as a candidate for the production of complex eukaryotic proteins. The common yeast expression hosts used for recombinant proteins' expression include Saccharomyces cerevisiae, Pichia pastoris, Hansenula polymorpha, Yarrowia lipolytica, Arxula adeninivorans, Kluyveromyces lactis, and Schizosaccharomyces pombe. This review is dedicated to discuss on significant characteristics of the most common methylotrophic and non-methylotrophic yeast expression systems with an emphasis on their advantages and new developments.
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Affiliation(s)
- Roghayyeh Baghban
- Medical Biotechnology Department, Faculty of Advanced Medical Science, Tabriz University of Medical Sciences, Tabriz, Iran.,Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran.,Biotechnology Research Center, Tabriz University of Medical Sciences, Daneshgah Ave, Tabriz, Iran
| | - Safar Farajnia
- Biotechnology Research Center, Tabriz University of Medical Sciences, Daneshgah Ave, Tabriz, Iran. .,Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
| | - Masoumeh Rajabibazl
- Department of Clinical Biochemistry, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Velenjak, Arabi Ave, Tehran, Iran. .,Department of Biotechnology, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Younes Ghasemi
- Department of Pharmaceutical Biotechnology, Faculty of Pharmacy and Pharmaceutical Sciences Research Center, Shiraz University of Medical Science, Shiraz, Iran
| | - AmirAli Mafi
- Anesthesiology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Reyhaneh Hoseinpoor
- Department of Biotechnology, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Leila Rahbarnia
- Infectious and Tropical Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Maryam Aria
- Biotechnology Research Center, Tabriz University of Medical Sciences, Daneshgah Ave, Tabriz, Iran
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14
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Aryamloo P, Asgarian-Omran H, Aslani N, Hossein-Nataj H, Shokohi T, Badali H, Nabili M, Abdollahi Gohar A, Moazeni M. Cellular apoptosis: An alternative mechanism of action for caspofungin against Candida glabrata. Curr Med Mycol 2019; 5:9-15. [PMID: 31321332 PMCID: PMC6626714 DOI: 10.18502/cmm.5.2.1155] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Background and Purpose: Although the mechanism of action for echinocandins is known, the physiological mechanisms by which these antifungal agents cause cell death via the classical apoptotic pathways are not well-defined yet. Regarding this, the present study aimed to evaluate the mechanisms of caspofungin-induced Candida glabrata cell death. Materials and Methods: For the purpose of the study, the minimum inhibitory concentration (MIC) of caspofungin against C. glabrata (ATCC 90030) was determined using the broth microdilution reference method (CLSI M27-A2 and M27-S4). The annexin V and propidium iodide staining was performed to determine the way through which caspofungin acts against C. glabrata (i.e., through the induction of apoptosis and/or necrosis). Additionally, the possible effect of caspofungin on inducing the expression of two apoptotic genes, namely MCA1 and NUC, was studied using the real-time polymerase chain reaction assay. Results: According to the obtained MIC value (0.5 µg/mL), C. glabrata, exposed to 0.25, 0.5, and 1 µg/mL of caspofungin, exhibited the features of late apoptosis/necrosis after 18 h of incubation. Furthermore, the use of 0.25, 0.5, and 1 µg/ml caspofungin induced apoptosis (early/late) in 14.67%, 17.04%, and 15.89% of the cells, respectively. The results showed a significant difference between the percentages of early-apoptotic cells at the three concentrations (P<0.05). In addition, the rate of necrosis was significantly greater than that of apoptosis in response to caspofungin. Accordingly, necrosis occurred in 71.26%, 71.26%, and 61.26% of the cells at the caspofungin concentrations of 0.25, 0.5, and 1 µg/mL, respectively (P<0.05). The analysis of the data in the REST software demonstrated a significant increase in the expression of MCA1 and NUC1 genes (P<0.05). Conclusion: As the findings of the present study indicated, caspofungin promoted both necrosis and apoptosis of C. glabrata cells at concentrations higher than or equal to the MIC value.
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Affiliation(s)
- Parisa Aryamloo
- Student Research Committee, Mazandaran University of Medical Sciences, Sari, Iran
| | - Hossein Asgarian-Omran
- Department of Immunology, School of Medicine, Mazandaran University of Medical Sciences, Sari, Iran.,Immunogenetic Research Center, School of Medicine, Mazandaran University of Medical Sciences, Sari, Iran
| | - Narges Aslani
- Infectious and Tropical Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Hadi Hossein-Nataj
- Department of Immunology, School of Medicine, Mazandaran University of Medical Sciences, Sari, Iran
| | - Tahereh Shokohi
- Invasive Fungi Research Center, Mazandaran University of Medical Sciences, Sari, Iran.,Department of Medical Mycology, School of Medicine, Mazandaran University of Medical Sciences, Sari, Iran
| | - Hamid Badali
- Invasive Fungi Research Center, Mazandaran University of Medical Sciences, Sari, Iran.,Department of Medical Mycology, School of Medicine, Mazandaran University of Medical Sciences, Sari, Iran
| | - Mojtaba Nabili
- Department of Medical Laboratory Sciences, Sari Branch, Islamic Azad University, Sari, Iran
| | | | - Maryam Moazeni
- Invasive Fungi Research Center, Mazandaran University of Medical Sciences, Sari, Iran.,Department of Medical Mycology, School of Medicine, Mazandaran University of Medical Sciences, Sari, Iran
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15
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Sousa CA, Soares HMVM, Soares EV. Nickel Oxide Nanoparticles Trigger Caspase- and Mitochondria-Dependent Apoptosis in the Yeast Saccharomyces cerevisiae. Chem Res Toxicol 2019; 32:245-254. [PMID: 30656935 DOI: 10.1021/acs.chemrestox.8b00265] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The expansion of the industrial use of nickel oxide (NiO) nanoparticles (NPs) raises concerns about their potential adverse effects. Our work aimed to investigate the mechanisms of toxicity induced by NiO NPs, using the yeast Saccharomyces cerevisiae as a cell model. Yeast cells exposed to NiO NPs exhibited typical hallmarks of regulated cell death (RCD) by apoptosis [loss of cell proliferation capacity (cell viability), exposure of phosphatidylserine at the outer cytoplasmic membrane leaflet, nuclear chromatin condensation, and DNA damage] in a process that required de novo protein synthesis. The execution of yeast cell death induced by NiO NPs is Yca1p metacaspase-dependent. NiO NPs also induced a decrease in the mitochondrial membrane potential and an increase in the frequency of respiratory-deficient mutants, which supports the involvement of mitochondria in the cell death process. Cells deficient in the apoptosis-inducing factor ( aif1Δ) displayed higher tolerance to NiO NPs, which reinforces the involvement of mitochondria in RCD by apoptosis. In summary, this study shows that NiO NPs induce caspase- and mitochondria-dependent apoptosis in yeast. Our results warn about the possible harmful effects associated with the use of NiO NPs.
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Affiliation(s)
- Cátia A Sousa
- Bioengineering Laboratory-CIETI, Chemical Engineering Department , ISEP-School of Engineering of Polytechnic Institute of Porto , Rua Dr António Bernardino de Almeida, 431 , 4249-015 Porto , Portugal.,CEB-Centre of Biological Engineering , University of Minho, Campus de Gualtar , 4710-057 Braga , Portugal.,REQUIMTE/LAQV, Departamento de Engenharia Química, Faculdade de Engenharia , Universidade do Porto , rua Dr. Roberto Frias , 4200-465 Porto , Portugal
| | - Helena M V M Soares
- REQUIMTE/LAQV, Departamento de Engenharia Química, Faculdade de Engenharia , Universidade do Porto , rua Dr. Roberto Frias , 4200-465 Porto , Portugal
| | - Eduardo V Soares
- Bioengineering Laboratory-CIETI, Chemical Engineering Department , ISEP-School of Engineering of Polytechnic Institute of Porto , Rua Dr António Bernardino de Almeida, 431 , 4249-015 Porto , Portugal.,CEB-Centre of Biological Engineering , University of Minho, Campus de Gualtar , 4710-057 Braga , Portugal
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16
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Hofer S, Kainz K, Zimmermann A, Bauer MA, Pendl T, Poglitsch M, Madeo F, Carmona-Gutierrez D. Studying Huntington's Disease in Yeast: From Mechanisms to Pharmacological Approaches. Front Mol Neurosci 2018; 11:318. [PMID: 30233317 PMCID: PMC6131589 DOI: 10.3389/fnmol.2018.00318] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Accepted: 08/16/2018] [Indexed: 12/22/2022] Open
Abstract
Huntington's disease (HD) is a neurodegenerative disorder that leads to progressive neuronal loss, provoking impaired motor control, cognitive decline, and dementia. So far, HD remains incurable, and available drugs are effective only for symptomatic management. HD is caused by a mutant form of the huntingtin protein, which harbors an elongated polyglutamine domain and is highly prone to aggregation. However, many aspects underlying the cytotoxicity of mutant huntingtin (mHTT) remain elusive, hindering the efficient development of applicable interventions to counteract HD. An important strategy to obtain molecular insights into human disorders in general is the use of eukaryotic model organisms, which are easy to genetically manipulate and display a high degree of conservation regarding disease-relevant cellular processes. The budding yeast Saccharomyces cerevisiae has a long-standing and successful history in modeling a plethora of human maladies and has recently emerged as an effective tool to study neurodegenerative disorders, including HD. Here, we summarize some of the most important contributions of yeast to HD research, specifically concerning the elucidation of mechanistic features of mHTT cytotoxicity and the potential of yeast as a platform to screen for pharmacological agents against HD.
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Affiliation(s)
- Sebastian Hofer
- Institute of Molecular Biosciences, University of Graz, Graz, Austria
| | - Katharina Kainz
- Institute of Molecular Biosciences, University of Graz, Graz, Austria
| | - Andreas Zimmermann
- Institute of Molecular Biosciences, University of Graz, Graz, Austria
- Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Maria A. Bauer
- Institute of Molecular Biosciences, University of Graz, Graz, Austria
| | - Tobias Pendl
- Institute of Molecular Biosciences, University of Graz, Graz, Austria
| | - Michael Poglitsch
- Institute of Molecular Biosciences, University of Graz, Graz, Austria
| | - Frank Madeo
- Institute of Molecular Biosciences, University of Graz, Graz, Austria
- BioTechMed-Graz, Graz, Austria
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17
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Agus HH, Sarp C, Cemiloglu M. Oxidative stress and mitochondrial impairment mediated apoptotic cell death induced by terpinolene in Schizosaccharomyces pombe. Toxicol Res (Camb) 2018; 7:848-858. [PMID: 30310662 PMCID: PMC6116180 DOI: 10.1039/c8tx00100f] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Accepted: 04/25/2018] [Indexed: 12/27/2022] Open
Abstract
Terpinolene is one of the most abundant monoterpenes used as a food supplement or odorant in cosmetics and the pharmaceutical industry. In this study, we aimed to assess apoptotic, oxidative and cytotoxic effects of terpinolene. We used the fission yeast (Schizosaccharomyces pombe) as a promising uni-cellular model organism in molecular toxicology and cell death research, due to its resemblance to mammalian cells at the molecular level. After terpinolene exposure (200-800 mg L-1), the IC50 and LC50 were calculated as 349.17 mg L-1 and 593.87 mg L-1. Cells, stained with acridine orange/ethidium bromide and DAPI, showed apoptotic nuclear morphology, chromatin condensation and fragmentation. 2,7-Dichlorodihydrofluorescein diacetate (DCFDA) fluorescence gradually increased (1.5-2-fold increase) in correlation with increasing concentrations of terpinolene (200-800 mg L-1). Mitochondrial impairment at higher concentrations of terpinolene (400-800 mg L-1) was shown by Rhodamine 123 staining. Real-time PCR experiments showed significant increases (1.5-3-fold) in SOD1 and GPx1 levels (p < 0.05) as well as 2-2.5-fold increases (p < 0.05) in pro-apoptotic factors, Pca1 and Sprad9. The potential effects of terpinolene on programmed cell death and the underlying mechanisms were clarified in unicellular model fungi, Schizosaccharomyces pombe.
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Affiliation(s)
- Hizlan H Agus
- Department of Molecular Biology and Genetics , Istanbul Yeni Yuzyil University , Istanbul , Turkey . ; Tel: +90 212 444 50 01
| | - Cemaynur Sarp
- Department of Molecular Biology and Genetics , Istanbul Yeni Yuzyil University , Istanbul , Turkey . ; Tel: +90 212 444 50 01
| | - Meryem Cemiloglu
- Department of Molecular Biology and Genetics , Istanbul Yeni Yuzyil University , Istanbul , Turkey . ; Tel: +90 212 444 50 01
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18
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Miltefosine Has a Postantifungal Effect and Induces Apoptosis in Cryptococcus Yeasts. Antimicrob Agents Chemother 2018; 62:AAC.00312-18. [PMID: 29844051 DOI: 10.1128/aac.00312-18] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Accepted: 05/18/2018] [Indexed: 02/04/2023] Open
Abstract
Cryptococcus spp. are common opportunistic fungal pathogens, particularly in HIV patients. The approved drug miltefosine (MFS) has potential as an alternative antifungal against cryptococcosis; however, the mechanism of action of MFS in Cryptococcus is poorly understood. Here, we examined the effects of MFS on C. neoformans and C. gattii yeasts (planktonic and biofilm lifestyles) to clarify its mechanism of action. MFS presented inhibitory and fungicidal effects against planktonic Cryptococcus cells, with similar activities against dispersion biofilm cells, while sessile biofilm cells were less sensitive to MFS. Interestingly, MFS had postantifungal effect on Cryptococcus, with a proliferation delay of up to 8.15 h after a short exposure to fungicidal doses. MFS at fungicidal concentrations increased the plasma membrane permeability, likely due to a direct interaction with ergosterol, as suggested by competition assays with exogenous ergosterol. Moreover, MFS reduced the mitochondrial membrane potential, increased reactive oxygen species (ROS) production, and induced DNA fragmentation and condensation, all of which are hallmarks of apoptosis. Transmission electron microscopy analysis showed that MFS-treated yeasts had a reduced mucopolysaccharide capsule (confirmed by morphometry with light microscopy), plasma membrane irregularities, mitochondrial swelling, and a less conspicuous cell wall. Our results suggest that MFS increases the plasma membrane permeability in Cryptococcus via an interaction with ergosterol and also affects the mitochondrial membrane, eventually leading to apoptosis, in line with its fungicidal activity. These findings confirm the potential of MFS as an antifungal against C. neoformans and C. gattii and warrant further studies to establish clinical protocols for MFS use against cryptococcosis.
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19
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Sonderegger C, Váradi G, Galgóczy L, Kocsubé S, Posch W, Borics A, Dubrac S, Tóth GK, Wilflingseder D, Marx F. The Evolutionary Conserved γ-Core Motif Influences the Anti- Candida Activity of the Penicillium chrysogenum Antifungal Protein PAF. Front Microbiol 2018; 9:1655. [PMID: 30079061 PMCID: PMC6062912 DOI: 10.3389/fmicb.2018.01655] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Accepted: 07/03/2018] [Indexed: 12/16/2022] Open
Abstract
Small, cysteine-rich and cationic antimicrobial proteins (AMPs) from filamentous ascomycetes represent ideal bio-molecules for the development of next-generation antifungal therapeutics. They are promising candidates to counteract resistance development and may complement or even replace current small molecule-based antibiotics in the future. In this study, we show that a 14 amino acid (aa) long peptide (Pγ) spanning the highly conserved γ-core motif of the Penicillium chrysogenum antifungal protein (PAF) has antifungal activity against the opportunistic human pathogenic yeast Candida albicans. By substituting specific aa we elevated the positive net charge and the hydrophilicity of Pγ and created the peptide variants Pγvar and Pγopt with 10-fold higher antifungal activity than Pγ. Similarly, the antifungal efficacy of the PAF protein could be significantly improved by exchanging the respective aa in the γ-core of the protein by creating the protein variants PAFγvar and PAFγopt. The designed peptides and proteins were investigated in detail for their physicochemical features and mode of action, and were tested for cytotoxicity on mammalian cells. This study proves for the first time the important role of the γ-core motif in the biological function of an AMP from ascomycetes. Furthermore, we provide a detailed phylogenetic analysis that proves the presence and conservation of the γ-core motif in all AMP classes from Eurotiomycetes. We emphasize the potential of this common protein motif for the design of short antifungal peptides and as a protein motif in which targeted aa substitutions enhance antimicrobial activity.
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Affiliation(s)
- Christoph Sonderegger
- Biocenter, Division of Molecular Biology, Innsbruck Medical University, Innsbruck, Austria
| | - Györgyi Váradi
- Department of Medical Chemistry, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | - László Galgóczy
- Institute of Plant Biology, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Sándor Kocsubé
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Szeged, Hungary
| | - Wilfried Posch
- Division of Hygiene and Medical Microbiology, Innsbruck Medical University, Innsbruck, Austria
| | - Attila Borics
- Institute of Biochemistry, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Sandrine Dubrac
- Department of Dermatology, Venereology and Allergy, Innsbruck Medical University, Innsbruck, Austria
| | - Gábor K. Tóth
- Department of Medical Chemistry, Faculty of Medicine, University of Szeged, Szeged, Hungary
- MTA-SZTE Biomimetic Systems Research Group, University of Szeged, Szeged, Hungary
| | - Doris Wilflingseder
- Division of Hygiene and Medical Microbiology, Innsbruck Medical University, Innsbruck, Austria
| | - Florentine Marx
- Biocenter, Division of Molecular Biology, Innsbruck Medical University, Innsbruck, Austria
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20
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Arellano VJ, Martinell García P, Rodríguez Plaza JG, Lara Ortiz MT, Schreiber G, Volkmer R, Klipp E, Rio GD. An Antimicrobial Peptide Induces FIG1-Dependent Cell Death During Cell Cycle Arrest in Yeast. Front Microbiol 2018; 9:1240. [PMID: 29963019 PMCID: PMC6010521 DOI: 10.3389/fmicb.2018.01240] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 05/23/2018] [Indexed: 12/30/2022] Open
Abstract
Although most antibiotics act on cells that are actively dividing and non-dividing cells such as in microbe sporulation or cancer stem cells represent a new paradigm for the control of disease. In addition to their relevance to health, such antibiotics may promote our understanding of the relationship between the cell cycle and cell death. No antibiotic specifically acting on microbial cells arrested in their cell cycle has been identified until the present time. In this study we used an antimicrobial peptide derived from α-pheromone, IP-1, targeted against MATa Saccharomyces cerevisiae cells in order to assess its dependence on cell cycle arrest to kill cells. Analysis by flow cytometry and fluorescence microscopy of various null mutations of genes involved in biological processes activated by the pheromone pathway (the mitogen-activated protein kinase pathway, cell cycle arrest, cell proliferation, autophagy, calcium influx) showed that IP-1 requires arrest in G0/G1 in order to kill yeast cells. Isolating cells in different cell cycle phases by elutriation provided further evidence that entry into cell cycle arrest, and not into G1 phase, is necessary if our peptide is to kill yeast cells. We also describe a variant of IP-1 that does not activate the pheromone pathway and consequently does not kill yeast cells that express the pheromone’s receptor; the use of this variant peptide in combination with different cell cycle inhibitors that induce cell cycle arrest independently of the pheromone pathway confirmed that it is cell cycle arrest that is required for the cell death induced by this peptide in yeast. We show that the cell death induced by IP-1 differs from that induced by α-pheromone and depends on FIG1 in a way independent of the cell cycle arrest induced by the pheromone. Thus, IP-1 is the first molecule described that specifically kills microbial cells during cell cycle arrest, a subject of interest beyond the process of mating in yeast cells. The experimental system described in this study should be useful in the study of the mechanisms at play in the communication between cell cycle arrest and cell death on other organisms, hence promoting the development of new antibiotics.
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Affiliation(s)
- Vladimir J Arellano
- Departamento de Bioquímica y Biología Estructural, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Paula Martinell García
- Departamento de Bioquímica y Biología Estructural, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Mexico City, Mexico.,Theoretische Biophysik, Humboldt-Universität zu Berlin, Berlin, Germany
| | | | - Maria T Lara Ortiz
- Departamento de Bioquímica y Biología Estructural, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | | | - Rudolf Volkmer
- Institut für Medizinische Immunologie, Charité - Universitätsmedizin Berlin, Berlin, Germany.,Leibniz-Institut für Molekulare Pharmakologie, Berlin, Germany
| | - Edda Klipp
- Theoretische Biophysik, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Gabriel Del Rio
- Departamento de Bioquímica y Biología Estructural, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Mexico City, Mexico
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21
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Abstract
Centipedes, a kind of arthropod, have been reported to produce antimicrobial peptides as part of an innate immune response. Scolopendin 2 (AGLQFPVGRIGRLLRK) is a novel antimicrobial peptide derived from the body of the centipede Scolopendra subspinipes mutilans by using RNA sequencing. To investigate the intracellular responses induced by scolopendin 2, reactive oxygen species (ROS) and glutathione accumulation and lipid peroxidation were monitored over sublethal and lethal doses. Intracellular ROS and antioxidant molecule levels were elevated and lipids were peroxidized at sublethal concentrations. Moreover, the Ca(2+) released from the endoplasmic reticulum accumulated in the cytosol and mitochondria. These stress responses were considered to be associated with yeast apoptosis. Candida albicans cells exposed to scolopendin 2 were identified using diagnostic markers of apoptotic response. Various responses such as phosphatidylserine externalization, chromatin condensation, and nuclear fragmentation were exhibited. Scolopendin 2 disrupted the mitochondrial membrane potential and activated metacaspase, which was mediated by cytochrome c release. In conclusion, treatment of C. albicans with scolopendin 2 induced the apoptotic response at sublethal doses, which in turn led to mitochondrial dysfunction, metacaspase activation, and cell death. The cationic antimicrobial peptide scolopendin 2 from the centipede is a potential antifungal peptide, triggering the apoptotic response.
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Affiliation(s)
- Heejeong Lee
- BK 21 Plus KNU Creative BioResearch Group, School of Life Science, College of Natural Sciences, Kyungpook National University, 80 Daehakro, Bukgu, Daegu, 41566, Republic of Korea
| | - Jae-Sam Hwang
- Department of Agricultural Biology, National Academy of Agricultural Science RDA, Jeonju, Republic of Korea
| | - Dong Gun Lee
- BK 21 Plus KNU Creative BioResearch Group, School of Life Science, College of Natural Sciences, Kyungpook National University, 80 Daehakro, Bukgu, Daegu, 41566, Republic of Korea.
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22
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Lee H, Sugiharto YEC, Lee S, Park G, Han C, Jang H, Jeon W, Park H, Ahn J, Kang K, Lee H. Characterization of the newly isolated ω-oxidizing yeast Candida sorbophila DS02 and its potential applications in long-chain dicarboxylic acid production. Appl Microbiol Biotechnol 2017; 101:6333-6342. [PMID: 28589225 DOI: 10.1007/s00253-017-8321-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Revised: 04/18/2017] [Accepted: 04/29/2017] [Indexed: 12/13/2022]
Abstract
α, ω-Dicarboxylic acids (DCAs) are multipurpose chemicals widely used in polymers, perfumes, plasticizers, lubricants, and adhesives. The biotransformation of DCAs from alkanes and fatty acids by microorganisms has attracted recent interest, since synthesis via chemical oxidation causes problems in terms of the environment and safety. We isolated an ω-oxidizing yeast from a wastewater disposal facility of a petrochemical factory by chemostat enrichment culture. The haploid strain identified as Candida sorbophila DS02 grew on glucose and dodecane, exhibiting greater cell shrinkage on the latter. In flask cultures with mixed alkanes (C10-16) and fatty acid methyl esters (C10-16), DS02 used mixed alkanes simultaneously unlike Candida tropicalis and Yarrowia lipolytica and showed high substrate resistance. In flask cultures with acrylic acid-a known inhibitor of β-oxidation-DS02 produced 0.28 g/l dodecanedioic acid (DDDA) from dodecane, similar to wild-type C. tropicalis ATCC 20336. In fed-batch fermentation, DS02 produced 9.87 g/l DDDA, which was 5.7-fold higher than wild-type C. tropicalis. These results suggest that C. sorbophila strain DS02 has potential applications for the large-scale production of DCA.
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Affiliation(s)
- Heeseok Lee
- Department of Biosystems and Bioengineering, KRIBB School of Biotechnology, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea
- Biotechnology Process Engineering Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 30 Yeongudanji-ro, Ochang-eup, Cheongwon-gu, Cheongju-si, Chungcheongbuk-do, 28116, Republic of Korea
| | - Yohanes Eko Chandra Sugiharto
- Department of Biosystems and Bioengineering, KRIBB School of Biotechnology, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea
- Biotechnology Process Engineering Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 30 Yeongudanji-ro, Ochang-eup, Cheongwon-gu, Cheongju-si, Chungcheongbuk-do, 28116, Republic of Korea
| | - Seunghoon Lee
- R&D Center, Lotte Chemical Corporation, 115 Gajeongbuk-ro, Yuseong-gu, Daejeon, 34110, Republic of Korea
| | - Gyuyeon Park
- Department of Biosystems and Bioengineering, KRIBB School of Biotechnology, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea
- Biotechnology Process Engineering Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 30 Yeongudanji-ro, Ochang-eup, Cheongwon-gu, Cheongju-si, Chungcheongbuk-do, 28116, Republic of Korea
| | - Changpyo Han
- Biotechnology Process Engineering Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 30 Yeongudanji-ro, Ochang-eup, Cheongwon-gu, Cheongju-si, Chungcheongbuk-do, 28116, Republic of Korea
| | - Hyeran Jang
- R&D Center, Lotte Chemical Corporation, 115 Gajeongbuk-ro, Yuseong-gu, Daejeon, 34110, Republic of Korea
| | - Wooyoung Jeon
- Biotechnology Process Engineering Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 30 Yeongudanji-ro, Ochang-eup, Cheongwon-gu, Cheongju-si, Chungcheongbuk-do, 28116, Republic of Korea
| | - Heejoon Park
- R&D Center, Lotte Chemical Corporation, 115 Gajeongbuk-ro, Yuseong-gu, Daejeon, 34110, Republic of Korea
| | - Jungoh Ahn
- Department of Biosystems and Bioengineering, KRIBB School of Biotechnology, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea
- Biotechnology Process Engineering Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 30 Yeongudanji-ro, Ochang-eup, Cheongwon-gu, Cheongju-si, Chungcheongbuk-do, 28116, Republic of Korea
| | - Kyungbo Kang
- R&D Center, Lotte Chemical Corporation, 115 Gajeongbuk-ro, Yuseong-gu, Daejeon, 34110, Republic of Korea
| | - Hongwoen Lee
- Department of Biosystems and Bioengineering, KRIBB School of Biotechnology, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea.
- Biotechnology Process Engineering Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 30 Yeongudanji-ro, Ochang-eup, Cheongwon-gu, Cheongju-si, Chungcheongbuk-do, 28116, Republic of Korea.
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Calcium and oxidative stress mediate perillaldehyde-induced apoptosis in Candida albicans. Appl Microbiol Biotechnol 2017; 101:3335-3345. [DOI: 10.1007/s00253-017-8146-3] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Revised: 01/15/2017] [Accepted: 01/20/2017] [Indexed: 10/20/2022]
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Su Y, Yang Y, Huang Y. Loss of ppr3, ppr4, ppr6, or ppr10 perturbs iron homeostasis and leads to apoptotic cell death in Schizosaccharomyces pombe. FEBS J 2017; 284:324-337. [PMID: 27886462 DOI: 10.1111/febs.13978] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Revised: 10/19/2016] [Accepted: 11/23/2016] [Indexed: 12/31/2022]
Abstract
Pentatricopeptide repeat (PPR) proteins characterized by tandem arrays of a degenerate 35-amino-acid repeat belong to a large family of RNA-binding proteins that are involved in post-transcriptional control of organelle gene expression. PPR proteins are ubiquitous in eukaryotes, and particularly prevalent in higher plants. Schizosaccharomyces pombe has 10 PPR proteins. Among them, ppr3, ppr4, ppr6, and ppr10 participate in mitochondrial post-transcriptional processes and are required for mitochondrial electron transport chain (ETC) function. In the present work, we showed that deletion of ppr3, ppr4, ppr6, or ppr10 led to apoptotic cell death, as revealed by DAPI and Annexin V-FITC staining. These mutants also exhibited elevated levels of reactive oxygen species (ROS). RNA sequencing (RNA-seq) and quantitative RT-PCR analyses revealed that deletion of ppr10 affected critical biological processes. In particular, a core set of genes involved in iron uptake and/or iron homeostasis was elevated in the Δppr10 mutant, suggesting an elevated level of intracellular iron in the mutant. Consistent with this notion, Δppr3, Δppr4, Δppr6, and Δppr10 mutants exhibited increased sensitivity to iron. Furthermore, the iron chelator, bathophenanthroline disulfonic acid, but not the calcium chelator EGTA, nearly restored the viabilities of Δppr3, Δppr4, Δppr6, and Δppr10 mutants, and reduced ROS levels in the mutants. These results show for the first time that deletion of a ppr gene leads to perturbation of iron homeostasis. Our results also suggest that disrupted iron homeostasis in Δppr3, Δppr4, Δppr6, and Δppr10 mutants may lead to an increase in the level of ROS and induction of apoptotic cell death in S. pombe. DATABASE The RNA-seq data have been deposited in the National Center for Biotechnology Information (NCBI) BioProject database (accession number SRP091623) and Gene Expression Omnibus (GEO) database (accession number GSE90144).
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Affiliation(s)
- Yang Su
- Jiangsu Key Laboratory for Microbes and Functional Genomics, College of Life Sciences, Nanjing Normal University, China
| | - Yanmei Yang
- Jiangsu Key Laboratory for Microbes and Functional Genomics, College of Life Sciences, Nanjing Normal University, China
| | - Ying Huang
- Jiangsu Key Laboratory for Microbes and Functional Genomics, College of Life Sciences, Nanjing Normal University, China
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25
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Cruyt F, Sousa CA, Machado MD, Soares EV. Improvement of the slide culture technique for the assessment of yeast viability. JOURNAL OF THE INSTITUTE OF BREWING 2017. [DOI: 10.1002/jib.400] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Frederik Cruyt
- Bioengineering Laboratory-CIETI, Chemical Engineering Department, ISEP-School of Engineering of Polytechnic Institute of Porto; 4200-072 Porto Portugal
- KU Leuven, Faculty of Engineering Technology; B-9000 Ghent Belgium
| | - Cátia A. Sousa
- Bioengineering Laboratory-CIETI, Chemical Engineering Department, ISEP-School of Engineering of Polytechnic Institute of Porto; 4200-072 Porto Portugal
- REQUIMTE/LAQV, Chemical Engineering Department, Faculty of Engineering, University of Porto; 4200-465 Porto Portugal
- CEB-Centre of Biological Engineering, University of Minho; 4710-057 Braga Portugal
| | - Manuela D. Machado
- Bioengineering Laboratory-CIETI, Chemical Engineering Department, ISEP-School of Engineering of Polytechnic Institute of Porto; 4200-072 Porto Portugal
- CEB-Centre of Biological Engineering, University of Minho; 4710-057 Braga Portugal
| | - Eduardo V. Soares
- Bioengineering Laboratory-CIETI, Chemical Engineering Department, ISEP-School of Engineering of Polytechnic Institute of Porto; 4200-072 Porto Portugal
- CEB-Centre of Biological Engineering, University of Minho; 4710-057 Braga Portugal
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26
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Laprade DJ, Brown MS, McCarthy ML, Ritch JJ, Austriaco N. Filamentation protects Candida albicans from amphotericin B-induced programmed cell death via a mechanism involving the yeast metacaspase, MCA1. MICROBIAL CELL 2016; 3:285-292. [PMID: 27683660 PMCID: PMC5036395 DOI: 10.15698/mic2016.07.512] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The budding yeast Candida albicans is one of the most
significant fungal pathogens worldwide. It proliferates in two distinct cell
types: blastopores and filaments. Only cells that are able to transform from one
cell type into the other are virulent in mouse disease models. Programmed cell
death is a controlled form of cell suicide that occurs when C.
albicans cells are exposed to fungicidal drugs like amphotericin B
and caspofungin, and to other stressful conditions. We now provide evidence that
suggests that programmed cell death is cell-type specific in yeast: Filamentous
C. albicans cells are more resistant to amphotericin B- and
caspofungin-induced programmed cell death than their blastospore counterparts.
Finally, our genetic data suggests that this phenomenon is mediated by a
protective mechanism involving the yeast metacaspase, MCA1.
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Affiliation(s)
- David J Laprade
- Department of Biology, Providence College, 1 Cunningham Square, Providence, Rhode Island 02918, U.S.A
| | - Melissa S Brown
- Department of Biology, Providence College, 1 Cunningham Square, Providence, Rhode Island 02918, U.S.A
| | - Morgan L McCarthy
- Department of Biology, Providence College, 1 Cunningham Square, Providence, Rhode Island 02918, U.S.A
| | - James J Ritch
- Department of Biology, Providence College, 1 Cunningham Square, Providence, Rhode Island 02918, U.S.A
| | - Nicanor Austriaco
- Department of Biology, Providence College, 1 Cunningham Square, Providence, Rhode Island 02918, U.S.A
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27
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Chen X, Petranovic D. Role of frameshift ubiquitin B protein in Alzheimer's disease. WILEY INTERDISCIPLINARY REVIEWS-SYSTEMS BIOLOGY AND MEDICINE 2016; 8:300-13. [DOI: 10.1002/wsbm.1340] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Revised: 03/10/2016] [Accepted: 03/19/2016] [Indexed: 12/20/2022]
Affiliation(s)
- Xin Chen
- Systems and Synthetic Biology, Department of Biology and Biological Engineering; Chalmers University of Technology; Göteborg Sweden
| | - Dina Petranovic
- Systems and Synthetic Biology, Department of Biology and Biological Engineering; Chalmers University of Technology; Göteborg Sweden
- Novo Nordisk Foundation Center for Biosustainability; Chalmers University of Technology; Göteborg Sweden
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Scope and limitations of yeast as a model organism for studying human tissue-specific pathways. BMC SYSTEMS BIOLOGY 2015; 9:96. [PMID: 26714768 PMCID: PMC4696342 DOI: 10.1186/s12918-015-0253-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Accepted: 12/17/2015] [Indexed: 12/16/2022]
Abstract
Background Budding yeast, S. cerevisiae, has been used extensively as a model organism for studying cellular processes in evolutionarily distant species, including humans. However, different human tissues, while inheriting a similar genetic code, exhibit distinct anatomical and physiological properties. Specific biochemical processes and associated biomolecules that differentiate various tissues are not completely understood, neither is the extent to which a unicellular organism, such as yeast, can be used to model these processes within each tissue. Results We present a novel framework to systematically quantify the suitability of yeast as a model organism for different human tissues. To this end, we develop a computational method for dissecting the global human interactome into tissue-specific cellular networks. By individually aligning these networks with the yeast interactome, we simultaneously partition the functional space of human genes, and their corresponding pathways, based on their conservation both across species and among different tissues. Finally, we couple our framework with a novel statistical model to assess the conservation of tissue-specific pathways and infer the overall similarity of each tissue with yeast. We further study each of these subspaces in detail, and shed light on their unique biological roles in the human tissues. Conclusions Our framework provides a novel tool that can be used to assess the suitability of the yeast model for studying tissue-specific physiology and pathophysiology in humans. Many complex disorders are driven by a coupling of housekeeping (universally expressed in all tissues) and tissue-selective (expressed only in specific tissues) dysregulated pathways. While tissue-selective genes are significantly associated with the onset and development of a number of tissue-specific pathologies, we show that the human-specific subset has even higher association. Consequently, they provide excellent candidates as drug targets for therapeutic interventions. Electronic supplementary material The online version of this article (doi:10.1186/s12918-015-0253-0) contains supplementary material, which is available to authorized users.
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Shirazi F, Lewis RE, Kontoyiannis DP. Micafungin induced apoptosis in Candida parapsilosis independent of its susceptibility to micafungin. MICROBIAL CELL 2015; 2:445-450. [PMID: 28357269 PMCID: PMC5349207 DOI: 10.15698/mic2015.11.236] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
We hypothesized that the cell wall inhibitor micafungin (MICA) induces apoptosis in both MICA-susceptible (MICA-S) and MICA-non-susceptible (MICA-NS) Candida parapsilosis. Antifungal activity and apoptosis were analyzed in MICA-S and MICA-NS C. parapsilosis strains following exposure to micafungin for 3 h at 37°C in RPMI 1640 medium. Apoptosis was characterized by detecting phosphatidylserine externalization (PS), plasma membrane integrity, reactive oxygen species (ROS) generation, mitochondrial membrane potential changes, adenosine triphosphate (ATP) release, and caspase-like activity. Apoptosis was detected in MICA exposed (0.25 to 1 mg/L) susceptible C. parapsilosis strains and was associated with apoptosis of 20-52% of analyzed cells versus only 5-30% of apoptosis in MICA-NS cells exposed to micafungin (0.5 to 2 mg/L; P = 0.001). The MICA antifungal activity was correlated with apoptotic cells showing increased dihydrorhodamine-123 staining (indicating ROS production), Rh-123 staining (decreased mitochondrial membrane potential), elevated ATP, and increased metacaspase activity. In conclusion, MICA is pro-apoptotic in MICA-S cells, but still exerts apoptotic effects in MICA -NS C. parapsilosis.
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Affiliation(s)
- Fazal Shirazi
- Department of Infectious Diseases, Infection Control and Employee Health, The University of Texas M D Anderson Cancer Center, Houston, TX, USA
| | - Russel E Lewis
- Department of Infectious Diseases, Infection Control and Employee Health, The University of Texas M D Anderson Cancer Center, Houston, TX, USA. ; Current Address: Department of Medical and Surgical Sciences, University of Bologna, Bologna, Italy
| | - Dimitrios P Kontoyiannis
- Department of Infectious Diseases, Infection Control and Employee Health, The University of Texas M D Anderson Cancer Center, Houston, TX, USA
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30
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Lycopene induces apoptosis in Candida albicans through reactive oxygen species production and mitochondrial dysfunction. Biochimie 2015; 115:108-15. [DOI: 10.1016/j.biochi.2015.05.009] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2015] [Accepted: 05/12/2015] [Indexed: 12/12/2022]
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31
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Arlia-Ciommo A, Piano A, Leonov A, Svistkova V, Titorenko VI. Quasi-programmed aging of budding yeast: a trade-off between programmed processes of cell proliferation, differentiation, stress response, survival and death defines yeast lifespan. Cell Cycle 2015; 13:3336-49. [PMID: 25485579 PMCID: PMC4614525 DOI: 10.4161/15384101.2014.965063] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Recent findings suggest that evolutionarily distant organisms share the key features of the aging process and exhibit similar mechanisms of its modulation by certain genetic, dietary and pharmacological interventions. The scope of this review is to analyze mechanisms that in the yeast Saccharomyces cerevisiae underlie: (1) the replicative and chronological modes of aging; (2) the convergence of these 2 modes of aging into a single aging process; (3) a programmed differentiation of aging cell communities in liquid media and on solid surfaces; and (4) longevity-defining responses of cells to some chemical compounds released to an ecosystem by other organisms populating it. Based on such analysis, we conclude that all these mechanisms are programs for upholding the long-term survival of the entire yeast population inhabiting an ecological niche; however, none of these mechanisms is a ʺprogram of agingʺ - i.e., a program for progressing through consecutive steps of the aging process.
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Key Words
- D, diauxic growth phase
- ERCs, extrachromosomal rDNA circles
- IPOD, insoluble protein deposit
- JUNQ, juxtanuclear quality control compartment
- L, logarithmic growth phase
- MBS, the mitochondrial back-signaling pathway
- MTC, the mitochondrial translation control signaling pathway
- NPCs, nuclear pore complexes
- NQ, non-quiescent cells
- PD, post-diauxic growth phase
- Q, quiescent cells
- ROS, reactive oxygen species
- RTG, the mitochondrial retrograde signaling pathway
- Ras/cAMP/PKA, the Ras family GTPase/cAMP/protein kinase A signaling pathway
- ST, stationary growth phase
- TOR/Sch9, the target of rapamycin/serine-threonine protein kinase Sch9 signaling pathway
- UPRER, the unfolded protein response pathway in the endoplasmic reticulum
- UPRmt, the unfolded protein response pathway in mitochondria
- cell growth and proliferation
- cell survival
- cellular aging
- ecosystems
- evolution
- longevity
- programmed cell death
- yeast
- yeast colony
- yeast replicative and chronological aging
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32
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Jones NK, Arab NT, Eid R, Gharib N, Sheibani S, Vali H, Khoury C, Murray A, Boucher E, Mandato CA, Young PG, Greenwood MT. Human Thyroid Cancer-1 (TC-1) is a vertebrate specific oncogenic protein that protects against copper and pro-apoptotic genes in yeast. MICROBIAL CELL 2015; 2:247-255. [PMID: 28357300 PMCID: PMC5349172 DOI: 10.15698/mic2015.07.213] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The human Thyroid Cancer-1 (hTC-1) protein, also known as C8orf4 was initially identified as a gene that was up-regulated in human thyroid cancer. Here we show that hTC-1 is a peptide that prevents the effects of over-expressing Bax in yeast. Analysis of the 106 residues of hTC-1 in available protein databases revealed direct orthologues in jawed-vertebrates, including mammals, frogs, fish and sharks. No TC-1 orthologue was detected in lower organisms, including yeast. Here we show that TC-1 is a general pro-survival peptide since it prevents the growth- and cell death-inducing effects of copper in yeast. Human TC-1 also prevented the deleterious effects that occur due to the over-expression of a number of key pro-apoptotic peptides, including YCA1, YBH3, NUC1, and AIF1. Even though the protective effects were more pronounced with the over-expression of YBH3 and YCA1, hTC-1 could still protect yeast mutants lacking YBH3 and YCA1 from the effects of copper sulfate. This suggests that the protective effects of TC-1 are not limited to specific pathways or processes. Taken together, our results indicate that hTC-1 is a pro-survival protein that retains its function when heterologously expressed in yeast. Thus yeast is a useful model to characterize the potential roles in cell death and survival of cancer related genes.
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Affiliation(s)
- Natalie K Jones
- Department of Chemistry and Chemical Engineering, Royal Military College of Canada, Kingston, Ontario, Canada. ; Department of Anatomy and Cell Biology, McGill University, Montreal, Quebec, Canada. ; Present address: Department of Experimental Medicine, McGill University, Montreal, Quebec, Canada
| | - Nagla T Arab
- Department of Chemistry and Chemical Engineering, Royal Military College of Canada, Kingston, Ontario, Canada. ; Department of Biology, Queen's University, Kingston, Ontario, Canada
| | - Rawan Eid
- Department of Chemistry and Chemical Engineering, Royal Military College of Canada, Kingston, Ontario, Canada. ; Department of Biology, Queen's University, Kingston, Ontario, Canada
| | - Nada Gharib
- Department of Chemistry and Chemical Engineering, Royal Military College of Canada, Kingston, Ontario, Canada. ; Present address: Department of Biomedical Sciences, Queen's University, Kingston, Ontario, Canada
| | - Sara Sheibani
- Department of Chemistry and Chemical Engineering, Royal Military College of Canada, Kingston, Ontario, Canada. ; Department of Anatomy and Cell Biology, McGill University, Montreal, Quebec, Canada. ; Present address: Defence Research and Development Canada, Alberta, Canada
| | - Hojatollah Vali
- Department of Anatomy and Cell Biology, McGill University, Montreal, Quebec, Canada
| | - Chamel Khoury
- Department of Chemistry and Chemical Engineering, Royal Military College of Canada, Kingston, Ontario, Canada
| | - Alistair Murray
- Department of Chemistry and Chemical Engineering, Royal Military College of Canada, Kingston, Ontario, Canada. ; Department of Anatomy and Cell Biology, McGill University, Montreal, Quebec, Canada
| | - Eric Boucher
- Department of Anatomy and Cell Biology, McGill University, Montreal, Quebec, Canada
| | - Craig A Mandato
- Department of Anatomy and Cell Biology, McGill University, Montreal, Quebec, Canada
| | - Paul G Young
- Department of Biology, Queen's University, Kingston, Ontario, Canada
| | - Michael T Greenwood
- Department of Chemistry and Chemical Engineering, Royal Military College of Canada, Kingston, Ontario, Canada
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Chen X, Petranovic D. Amyloid-β peptide-induced cytotoxicity and mitochondrial dysfunction in yeast. FEMS Yeast Res 2015; 15:fov061. [PMID: 26152713 DOI: 10.1093/femsyr/fov061] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/01/2015] [Indexed: 12/22/2022] Open
Abstract
Alzheimer's disease (AD) is the most common neurodegenerative disease, characterized by deposits of amyloid-β (Aβ) peptides. However, the underlying molecular mechanisms of neuron cell dysfunction and cell death in AD still remain poorly understood. Yeast Saccharomyces cerevisiae shares many conserved biological processes with all eukaryotic cells, including human neurons. Thanks to relatively simple and quick genetic and environmental manipulations, the large knowledge base and data collections, this organism has become a valuable tool to unravel fundamental intracellular mechanisms underlying neurodegeneration. In this study, we have used yeast as a model system to study the effects of intracellular Aβ peptides and we found that cells constitutively producing native Aβ directed to the secretory pathway exhibited a lower growth rate, lower biomass yield, lower respiratory rate, increased oxidative stress, hallmarks of mitochondrial dysfunction and ubiquitin-proteasome system dysfunction. These findings are relevant for better understanding the role of Aβ in cell stress and cell damage.
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Affiliation(s)
- Xin Chen
- Systems and Synthetic Biology, Department of Biology and Biological Engineering, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
| | - Dina Petranovic
- Systems and Synthetic Biology, Department of Biology and Biological Engineering, Chalmers University of Technology, SE-412 96 Göteborg, Sweden Novo Nordisk Foundation Center for Biosustainability, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
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Kaniak-Golik A, Skoneczna A. Mitochondria-nucleus network for genome stability. Free Radic Biol Med 2015; 82:73-104. [PMID: 25640729 DOI: 10.1016/j.freeradbiomed.2015.01.013] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Revised: 11/25/2014] [Accepted: 01/13/2015] [Indexed: 12/21/2022]
Abstract
The proper functioning of the cell depends on preserving the cellular genome. In yeast cells, a limited number of genes are located on mitochondrial DNA. Although the mechanisms underlying nuclear genome maintenance are well understood, much less is known about the mechanisms that ensure mitochondrial genome stability. Mitochondria influence the stability of the nuclear genome and vice versa. Little is known about the two-way communication and mutual influence of the nuclear and mitochondrial genomes. Although the mitochondrial genome replicates independent of the nuclear genome and is organized by a distinct set of mitochondrial nucleoid proteins, nearly all genome stability mechanisms responsible for maintaining the nuclear genome, such as mismatch repair, base excision repair, and double-strand break repair via homologous recombination or the nonhomologous end-joining pathway, also act to protect mitochondrial DNA. In addition to mitochondria-specific DNA polymerase γ, the polymerases α, η, ζ, and Rev1 have been found in this organelle. A nuclear genome instability phenotype results from a failure of various mitochondrial functions, such as an electron transport chain activity breakdown leading to a decrease in ATP production, a reduction in the mitochondrial membrane potential (ΔΨ), and a block in nucleotide and amino acid biosynthesis. The loss of ΔΨ inhibits the production of iron-sulfur prosthetic groups, which impairs the assembly of Fe-S proteins, including those that mediate DNA transactions; disturbs iron homeostasis; leads to oxidative stress; and perturbs wobble tRNA modification and ribosome assembly, thereby affecting translation and leading to proteotoxic stress. In this review, we present the current knowledge of the mechanisms that govern mitochondrial genome maintenance and demonstrate ways in which the impairment of mitochondrial function can affect nuclear genome stability.
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Affiliation(s)
- Aneta Kaniak-Golik
- Laboratory of Mutagenesis and DNA Repair, Institute of Biochemistry and Biophysics, Polish Academy of Science, 02-106 Warsaw, Poland
| | - Adrianna Skoneczna
- Laboratory of Mutagenesis and DNA Repair, Institute of Biochemistry and Biophysics, Polish Academy of Science, 02-106 Warsaw, Poland.
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35
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Núñez A, Dulude D, Jbel M, Rokeach LA. Calnexin is essential for survival under nitrogen starvation and stationary phase in Schizosaccharomyces pombe. PLoS One 2015; 10:e0121059. [PMID: 25803873 PMCID: PMC4372366 DOI: 10.1371/journal.pone.0121059] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Accepted: 02/06/2015] [Indexed: 12/04/2022] Open
Abstract
Cell fate is determined by the balance of conserved molecular mechanisms regulating death (apoptosis) and survival (autophagy). Autophagy is a process by which cells recycle their organelles and macromolecules through degradation within the vacuole in yeast and plants, and lysosome in metazoa. In the yeast Schizosaccharomyces pombe, autophagy is strongly induced under nitrogen starvation and in aging cells. Previously, we demonstrated that calnexin (Cnx1p), a highly conserved transmembrane chaperone of the endoplasmic reticulum (ER), regulates apoptosis under ER stress or inositol starvation. Moreover, we showed that in stationary phase, Cnx1p is cleaved into two moieties, L_Cnx1p and S_Cnx1p. Here, we show that the processing of Cnx1p is regulated by autophagy, induced by nitrogen starvation or cell aging. The cleavage of Cnx1p involves two vacuolar proteases: Isp6, which is essential for autophagy, and its paralogue Psp3. Blocking autophagy through the knockout of autophagy-related genes (atg) results in inhibition of both, the cleavage and the trafficking of Cnx1p from the ER to the vacuole. We demonstrate that Cnx1p is required for cell survival under nitrogen-starvation and in chronological aging cultures. The death of the mini_cnx1 mutant (overlapping S_cnx1p) cells is accompanied by accumulation of high levels of reactive-oxygen species (ROS), a slowdown in endocytosis and severe cell-wall defects. Moreover, mutant cells expressing only S_Cnx1p showed cell wall defects. Co-expressing mutant overlapping the L_Cnx1p and S_Cnx1p cleavage products reverses the death, ROS phenotype and cell wall defect to wild-type levels. As it is involved in both apoptosis and autophagy, Cnx1p could be a nexus for the crosstalk between these pro-death and pro-survival mechanisms. Ours, and observations in mammalian systems, suggest that the multiple roles of calnexin depend on its sub-cellular localization and on its cleavage. The use of S. pombe should assist in further shedding light on the multiple roles of calnexin.
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Affiliation(s)
- Andrés Núñez
- Department of Biochemistry and Molecular Medicine, Université de Montréal, Montréal, Québec, Canada
| | - Dominic Dulude
- Department of Biochemistry and Molecular Medicine, Université de Montréal, Montréal, Québec, Canada
| | - Mehdi Jbel
- Department of Biochemistry and Molecular Medicine, Université de Montréal, Montréal, Québec, Canada
| | - Luis A. Rokeach
- Department of Biochemistry and Molecular Medicine, Université de Montréal, Montréal, Québec, Canada
- * E-mail:
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Arlia-Ciommo A, Leonov A, Piano A, Svistkova V, Titorenko VI. Cell-autonomous mechanisms of chronological aging in the yeast Saccharomyces cerevisiae. MICROBIAL CELL 2014; 1:163-178. [PMID: 28357241 PMCID: PMC5354559 DOI: 10.15698/mic2014.06.152] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A body of evidence supports the view that the signaling pathways governing
cellular aging - as well as mechanisms of their modulation by
longevity-extending genetic, dietary and pharmacological interventions - are
conserved across species. The scope of this review is to critically analyze
recent advances in our understanding of cell-autonomous mechanisms of
chronological aging in the budding yeast Saccharomyces
cerevisiae. Based on our analysis, we propose a concept of a
biomolecular network underlying the chronology of cellular aging in yeast. The
concept posits that such network progresses through a series of lifespan
checkpoints. At each of these checkpoints, the intracellular concentrations of
some key intermediates and products of certain metabolic pathways - as well as
the rates of coordinated flow of such metabolites within an intricate network of
intercompartmental communications - are monitored by some checkpoint-specific
ʺmaster regulatorʺ proteins. The concept envisions that a synergistic action of
these master regulator proteins at certain early-life and late-life checkpoints
modulates the rates and efficiencies of progression of such processes as cell
metabolism, growth, proliferation, stress resistance, macromolecular
homeostasis, survival and death. The concept predicts that, by modulating these
vital cellular processes throughout lifespan (i.e., prior to an arrest of cell
growth and division, and following such arrest), the checkpoint-specific master
regulator proteins orchestrate the development and maintenance of a pro- or
anti-aging cellular pattern and, thus, define longevity of chronologically aging
yeast.
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Affiliation(s)
| | - Anna Leonov
- Department of Biology, Concordia University, Montreal, Quebec H4B 1R6, Canada
| | - Amanda Piano
- Department of Biology, Concordia University, Montreal, Quebec H4B 1R6, Canada
| | - Veronika Svistkova
- Department of Biology, Concordia University, Montreal, Quebec H4B 1R6, Canada
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. S, Wahyuni W, Artika I, . S. Antioxidant Activity of Flavonoid from Guazuma ulmifolia Lamk. Leaves and Apoptosis Induction in Yeast Cells. ACTA ACUST UNITED AC 2014. [DOI: 10.3923/jbs.2014.305.310] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Mirisola MG, Braun RJ, Petranovic D. Approaches to study yeast cell aging and death. FEMS Yeast Res 2013; 14:109-18. [DOI: 10.1111/1567-1364.12112] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2013] [Revised: 10/08/2013] [Accepted: 10/08/2013] [Indexed: 11/26/2022] Open
Affiliation(s)
| | - Ralf J. Braun
- Institut für Zellbiologie; Universität Bayreuth; Bayreuth Germany
| | - Dina Petranovic
- Department of Chemical and Biological Engineering, Systems and Synthetic Biology; Chalmers University of Technology; Göteborg Sweden
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Sheibani S, Richard VR, Beach A, Leonov A, Feldman R, Mattie S, Khelghatybana L, Piano A, Greenwood M, Vali H, Titorenko VI. Macromitophagy, neutral lipids synthesis, and peroxisomal fatty acid oxidation protect yeast from "liponecrosis", a previously unknown form of programmed cell death. Cell Cycle 2013; 13:138-47. [PMID: 24196447 DOI: 10.4161/cc.26885] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
We identified a form of cell death called "liponecrosis." It can be elicited by an exposure of the yeast Saccharomyces cerevisiae to exogenous palmitoleic acid (POA). Our data imply that liponecrosis is: (1) a programmed, regulated form of cell death rather than an accidental, unregulated cellular process and (2) an age-related form of cell death. Cells committed to liponecrotic death: (1) do not exhibit features characteristic of apoptotic cell death; (2) do not display plasma membrane rupture, a hallmark of programmed necrotic cell death; (3) akin to cells committed to necrotic cell death, exhibit an increased permeability of the plasma membrane for propidium iodide; (4) do not display excessive cytoplasmic vacuolization, a hallmark of autophagic cell death; (5) akin to cells committed to autophagic death, exhibit a non-selective en masse degradation of cellular organelles and require the cytosolic serine/threonine protein kinase Atg1p for executing the death program; and (6) display a hallmark feature that has not been reported for any of the currently known cell death modalities-namely, an excessive accumulation of lipid droplets where non-esterified fatty acids (including POA) are deposited in the form of neutral lipids. We therefore concluded that liponecrotic cell death subroutine differs from the currently known subroutines of programmed cell death. Our data suggest a hypothesis that liponecrosis is a cell death module dynamically integrated into a so-called programmed cell death network, which also includes the apoptotic, necrotic, and autophagic modules of programmed cell death. Based on our findings, we propose a mechanism underlying liponecrosis.
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Affiliation(s)
- Sara Sheibani
- Department of Anatomy and Cell Biology; McGill University; Montreal, Quebec, Canada; Department of Chemistry and Chemical Engineering; Royal Military College of Canada; Kingston, Ontario, Canada
| | - Vincent R Richard
- Department of Biology; Concordia University; Montreal, Quebec, Canada
| | - Adam Beach
- Department of Biology; Concordia University; Montreal, Quebec, Canada
| | - Anna Leonov
- Department of Biology; Concordia University; Montreal, Quebec, Canada
| | - Rachel Feldman
- Department of Biology; Concordia University; Montreal, Quebec, Canada
| | - Sevan Mattie
- Department of Biology; Concordia University; Montreal, Quebec, Canada
| | | | - Amanda Piano
- Department of Biology; Concordia University; Montreal, Quebec, Canada
| | - Michael Greenwood
- Department of Chemistry and Chemical Engineering; Royal Military College of Canada; Kingston, Ontario, Canada
| | - Hojatollah Vali
- Department of Anatomy and Cell Biology; McGill University; Montreal, Quebec, Canada
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Wanichthanarak K, Cvijovic M, Molt A, Petranovic D. yApoptosis: yeast apoptosis database. DATABASE-THE JOURNAL OF BIOLOGICAL DATABASES AND CURATION 2013; 2013:bat068. [PMID: 24082050 PMCID: PMC3786231 DOI: 10.1093/database/bat068] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
In the past few years, programmed cell death (PCD) has become a popular research area due to its fundamental aspects and its links to human diseases. Yeast has been used as a model for studying PCD, since the discovery of morphological markers of apoptotic cell death in yeast in 1997. Increasing knowledge in identification of components and molecular pathways created a need for organization of information. To meet the demands from the research community, we have developed a curated yeast apoptosis database, yApoptosis. The database structurally collects an extensively curated set of apoptosis, PCD and related genes, their genomic information, supporting literature and relevant external links. A web interface including necessary functions is provided to access and download the data. In addition, we included several networks where the apoptosis genes or proteins are involved, and present them graphically and interactively to facilitate rapid visualization. We also promote continuous inputs and curation by experts. yApoptosis is a highly specific resource for sharing information online, which supports researches and studies in the field of yeast apoptosis and cell death. Database URL:http://www.ycelldeath.com/yapoptosis/
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Affiliation(s)
- Kwanjeera Wanichthanarak
- Department of Chemical and Biological Engineering, Chalmers University of Technology, Kemivägen 10, 41296, Gothenburg, Sweden, Department of Mathematics, Chalmers University of Technology, Chalmers tvärgata 3, 41296, Gothenburg, Sweden, Department of Mathematics, University of Gothenburg, Chalmers tvärgata 3, 41296, Gothenburg, Sweden and Fine Chemicals and Biocatalysis Research, BASF SE, GVF/D - A030, 67056 Ludwigshafen, Germany
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Martani F, Fossati T, Posteri R, Signori L, Porro D, Branduardi P. Different response to acetic acid stress inSaccharomyces cerevisiaewild-type andl-ascorbic acid-producing strains. Yeast 2013; 30:365-78. [DOI: 10.1002/yea.2969] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2013] [Revised: 07/04/2013] [Accepted: 07/05/2013] [Indexed: 12/31/2022] Open
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Emrick D, Ravichandran A, Gosai J, Lu S, Gordon DM, Smith L. The antifungal occidiofungin triggers an apoptotic mechanism of cell death in yeast. JOURNAL OF NATURAL PRODUCTS 2013; 76:829-838. [PMID: 23672235 DOI: 10.1021/np300678e] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Occidiofungin is a nonribosomally synthesized cyclic peptide having a base mass of 1200 Da. It is naturally produced by the soil bacterium Burkholderia contaminans MS14 and possesses potent broad-spectrum antifungal properties. The mechanism of action of occidiofungin is unknown. Viability, terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL), reactive oxygen species (ROS) detection, membrane and cell wall stability, and membrane mimetic assays were used to characterize the effect of occidiofungin on yeast cells. Confocal and electron microscopy experiments were used to visualize morphological changes within treated cells. TUNEL and ROS detection assays revealed an increase in fluorescence with increasing concentrations of the antifungal. Yeast cells appeared to shrink in size and showed the presence of 'dancing bodies' at low drug concentrations (1 μg/mL). A screen carried out on Saccharomyces cerevisiae gene deletion mutants in the apoptotic and autophagy pathways identified the apoptotic gene for YCA1, as having an important role in occidiofungin response as cells deleted for this gene exhibit a 2-fold increase in resistance. Results from our experiments demonstrate that the mechanism of action for occidiofungin in yeast is different from that of the common classes of antifungals used in the clinic, such as azoles, polyenes, and echinocandins. Our study also indicates that occidiofungin causes cell death in yeast through an apoptotic mechanism of action.
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Affiliation(s)
- Dayna Emrick
- Department of Biological Sciences, Mississippi State University , Mississippi State, MS 39762, United States
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Anaerobic α-amylase production and secretion with fumarate as the final electron acceptor in Saccharomyces cerevisiae. Appl Environ Microbiol 2013; 79:2962-7. [PMID: 23435897 DOI: 10.1128/aem.03207-12] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
In this study, we focus on production of heterologous α-amylase in the yeast Saccharomyces cerevisiae under anaerobic conditions. We compare the metabolic fluxes and transcriptional regulation under aerobic and anaerobic conditions, with the objective of identifying the final electron acceptor for protein folding under anaerobic conditions. We find that yeast produces more amylase under anaerobic conditions than under aerobic conditions, and we propose a model for electron transfer under anaerobic conditions. According to our model, during protein folding the electrons from the endoplasmic reticulum are transferred to fumarate as the final electron acceptor. This model is supported by findings that the addition of fumarate under anaerobic (but not aerobic) conditions improves cell growth, specifically in the α-amylase-producing strain, in which it is not used as a carbon source. Our results provide a model for the molecular mechanism of anaerobic protein secretion using fumarate as the final electron acceptor, which may allow for further engineering of yeast for improved protein secretion under anaerobic growth conditions.
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Caspofungin kills Candida albicans by causing both cellular apoptosis and necrosis. Antimicrob Agents Chemother 2012; 57:326-32. [PMID: 23114781 DOI: 10.1128/aac.01366-12] [Citation(s) in RCA: 125] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Caspofungin exerts candidacidal activity by inhibiting cell wall (1,3)-β-d-glucan synthesis. We investigated the physiologic mechanisms of caspofungin-induced Candida albicans cell death. Apoptosis (programmed cell death) and necrosis were studied after C. albicans SC5314 cells were exposed to caspofungin at 0.06, 0.125, and 0.5 μg/ml (0.5×, 1×, and 4× the MIC, respectively) for 3 h. Caspofungin at 0.125 and 0.5 μg/ml reduced cellular viability by >50%, as measured by colony counts and methylene blue exclusion. Apoptosis and necrosis were demonstrated by annexin V and propidium iodide staining for phosphatidylserine externalization and loss of membrane integrity, respectively. At all concentrations of caspofungin, 20 to 25% and 5 to 7% of C. albicans cells exhibited early apoptosis and late apoptosis/necrosis, respectively (P value was not significant [NS]). Necrosis, on the other hand, was significantly greater at 0.125 (43%) and 0.5 (48%) μg/ml than at 0.06 μg/ml (26%) (P values of 0.003 and 0.003, respectively). The induction of apoptosis at concentrations less than or equal to the MIC was corroborated by dihydrorhodamine 123 (DHR-123) and dihydroethidium (DHE) staining (reactive oxygen species production), JC-1 staining (mitochondrial membrane potential dissipation), and terminal deoxynucleotidyl transferase dUTP nick-end labeling (TUNEL) and 4',6-diamidino-2-phenylindole dihydrochloride (DAPI) staining (DNA damage and nuclear fragmentation). Moreover, electron microscopy of cells exposed to 0.125 μg/ml of caspofungin showed hallmark apoptotic features like chromatin margination and condensation and nuclear blebs. Apoptosis was associated with metacaspase 1 activation, as demonstrated by D2R staining. Caspofungin exerts activity against C. albicans by directly killing cells (resulting in necrosis) and causing others to undergo programmed cell death (apoptosis). Apoptosis is initiated at subinhibitory concentrations, suggesting that strategies to target this process may augment the benefits of antifungal agents.
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Abstract
Expression of human Bax, a cardinal regulator of mitochondrial membrane permeabilization, causes death in yeast. We screened a human cDNA library for suppressors of Bax-mediated yeast death and identified human 14-3-3β/α, a protein whose paralogs have numerous chaperone-like functions. Here, we show that, yeast cells expressing human 14-3-3β/α are able to complement deletion of the endogenous yeast 14-3-3 and confer resistance to a variety of different stresses including cadmium and cycloheximide. The expression of 14-3-3β/α also conferred resistance to death induced by the target of rapamycin inhibitor rapamycin and by starvation for the amino acid leucine, conditions that induce autophagy. Cell death in response to these autophagic stimuli was also observed in the macroautophagic-deficient atg1Δ and atg7Δ mutants. Furthermore, 14-3-3β/α retained its ability to protect against the autophagic stimuli in these autophagic-deficient mutants arguing against so called 'autophagic death'. In line, analysis of cell death markers including the accumulation of reactive oxygen species, membrane integrity and cell surface exposure of phosphatidylserine indicated that 14-3-3β/α serves as a specific inhibitor of apoptosis. Finally, we demonstrate functional conservation of these phenotypes using the yeast homolog of 14-3-3: Bmh1. In sum, cell death in response to multiple stresses can be counteracted by 14-3-3 proteins.
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Clapp C, Portt L, Khoury C, Sheibani S, Eid R, Greenwood M, Vali H, Mandato CA, Greenwood MT. Untangling the Roles of Anti-Apoptosis in Regulating Programmed Cell Death using Humanized Yeast Cells. Front Oncol 2012; 2:59. [PMID: 22708116 PMCID: PMC3374133 DOI: 10.3389/fonc.2012.00059] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2012] [Accepted: 05/24/2012] [Indexed: 11/13/2022] Open
Abstract
Genetically programmed cell death (PCD) mechanisms, including apoptosis, are important for the survival of metazoans since it allows, among things, the removal of damaged cells that interfere with normal function. Cell death due to PCD is observed in normal processes such as aging and in a number of pathophysiologies including hypoxia (common causes of heart attacks and strokes) and subsequent tissue reperfusion. Conversely, the loss of normal apoptotic responses is associated with the development of tumors. So far, limited success in preventing unwanted PCD has been reported with current therapeutic approaches despite the fact that inhibitors of key apoptotic inducers such as caspases have been developed. Alternative approaches have focused on mimicking anti-apoptotic processes observed in cells displaying increased resistance to apoptotic stimuli. Hormesis and pre-conditioning are commonly observed cellular strategies where sub-lethal levels of pro-apoptotic stimuli lead to increased resistance to higher or lethal levels of stress. Increased expression of anti-apoptotic sequences is a common mechanism mediating these protective effects. The relevance of the latter observation is exemplified by the observation that transgenic mice overexpressing anti-apoptotic genes show significant reductions in tissue damage following ischemia. Thus strategies aimed at increasing the levels of anti-apoptotic proteins, using gene therapy or cell penetrating recombinant proteins are being evaluated as novel therapeutics to decrease cell death following acute periods of cell death inducing stress. In spite of its functional and therapeutic importance, more is known regarding the processes involved in apoptosis than anti-apoptosis. The genetically tractable yeast Saccharomyces cerevisiae has emerged as an exceptional model to study multiple aspects of PCD including the mitochondrial mediated apoptosis observed in metazoans. To increase our knowledge of the process of anti-apoptosis, we screened a human heart cDNA expression library in yeast cells undergoing PCD due to the conditional expression of a mammalian pro-apoptotic Bax cDNA. Analysis of the multiple Bax suppressors identified revealed several previously known as well as a large number of clones representing potential novel anti-apoptotic sequences. The focus of this review is to report on recent achievements in the use of humanized yeast in genetic screens to identify novel stress-induced PCD suppressors, supporting the use of yeast as a unicellular model organism to elucidate anti-apoptotic and cell survival mechanisms.
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Affiliation(s)
- Caitlin Clapp
- Department of Chemistry and Chemical Engineering, Royal Military College Kingston, ON, Canada
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