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Antifungal mechanisms of volatile organic compounds produced by Pseudomonas fluorescens ZX as biological fumigants against Botrytis cinerea. Microbiol Res 2023; 267:127253. [PMID: 36455309 DOI: 10.1016/j.micres.2022.127253] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2022] [Revised: 10/31/2022] [Accepted: 11/02/2022] [Indexed: 11/15/2022]
Abstract
To explore the antifungal mechanisms of volatile organic compounds (VOCs) produced by Pseudomonas fluorescens ZX against Botrytis cinerea, biochemical analyses and transcriptomic techniques were employed in this work. The results showed that P. fluorescens ZX-producing VOCs can increase the cell membrane permeability of B. cinerea and disrupt cell membrane integrity, resulting in leakage of the pathogen's cellular contents, inhibition of ergosterol biosynthesis (about 76%), and an increase in malondialdehyde (MDA) content. Additionally, for B. cinerea respiration, P. fluorescens ZX-producing VOCs (1 × 109 CFU /mL) significantly inhibited the activities of ATPase (55.7%), malate dehydrogenase (MDH) (33.1%), and succinate dehydrogenase (SDH) (57.9%), seriously interfering with energy metabolism and causing accumulation of reactive oxygen species (ROS). Furthermore, transcriptome analysis of B. cinerea following exposure to VOCs revealed 4590 differentially expressed genes (DEGs) (1388 upregulated, 3202 downregulated). Through GO analysis, these DEGs were determined to be enriched in intrinsic components of membrane, integral components of membrane, and membrane parts, while KEGG analysis indicated that they were enriched in many amino acid metabolism pathways. Significantly, the DEGs related to ergosterol biosynthesis, ATPase, mitochondrial respiratory chain, malate dehydrogenase, and cell membrane showed down-regulation, corroborating the biochemical analyses. Taken together, these results suggest that the antifungal activity of P. fluorescens ZX-producing VOCs against B. cinerea occurs primary mechanisms: causing significant damage to the cell membrane, negatively affecting respiration, and interfering with amino acid metabolism.
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Zhang W, Lv Y, Lv A, Wei S, Zhang S, Li C, Hu Y. Sub3 inhibits Aspergillus flavus growth by disrupting mitochondrial energy metabolism, and has potential biocontrol during peanut storage. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2021; 101:486-496. [PMID: 32643802 DOI: 10.1002/jsfa.10657] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 06/16/2020] [Accepted: 07/09/2020] [Indexed: 06/11/2023]
Abstract
BACKGROUND Aspergillus flavus, a saprophytic fungus, is regularly detected in oil-enriched seeds. During colonization, this organism releases aflatoxins that pose a serious risk to food safety and human health. Therefore, an eco-friendly biological approach to inhibit the pathogen is desirable. RESULTS Experimental results indicated that A. flavus spores could not germinate in potato dextrose broth culture medium, when the concentration of Sub3 exceeded 0.15 g L-1 . Morphological evaluation performed by flow cytometry and scanning electron microscopy indicated that spores were shrunken and pitted following Sub3 exposure. Physiological assessment using propidium iodide, 5,5',6,6'-tetrachloro-1,1',3,3'-tetraethylbenzimidazolocarbocyanine iodide, 2,7-dichlorodihydrofluorescein diacetate and 4',6-diamidino-2-phenylindole staining revealed damaged cell membranes, decreased mitochondrial membrane potential, increased intracellular reactive oxygen species levels, and elevated large nuclear condensation and DNA fragmentation. Moreover, mitochondrial dehydrogenase activity was reduced by 29.42% and 45.48% after treatment with 0.1 and 0.15 g L-1 Sub3, respectively. Additionally, colonization capacity in peanut was significantly decreased, and the number of spores on seeds treated with Sub3 was decreased by 26.86% (0.1 g L-1 ) and 77.74% (0.15 g L-1 ) compared with the control group. CONCLUSION Sub3 likely inhibits A. flavus by crossing the cell wall and targeting the cell membrane, disrupting mitochondrial energy metabolism, and inducing DNA damage, leading to spore death. Thus, Sub3 may provide a useful biocontrol strategy to control A. flavus growth in peanuts. © 2020 Society of Chemical Industry.
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Affiliation(s)
- Wei Zhang
- College of Biological Engineering, Henan University of Technology, Zhengzhou, P. R. China
| | - Yangyong Lv
- College of Biological Engineering, Henan University of Technology, Zhengzhou, P. R. China
| | - Ang Lv
- College of Biological Engineering, Henan University of Technology, Zhengzhou, P. R. China
| | - Shan Wei
- College of Biological Engineering, Henan University of Technology, Zhengzhou, P. R. China
| | - Shuaibing Zhang
- College of Biological Engineering, Henan University of Technology, Zhengzhou, P. R. China
| | - Cuixiang Li
- College of Biological Engineering, Henan University of Technology, Zhengzhou, P. R. China
| | - Yuansen Hu
- College of Biological Engineering, Henan University of Technology, Zhengzhou, P. R. China
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TUBP1 protein lead to mitochondria-mediated apoptotic cell death in Verticillium dahliae. Int J Biochem Cell Biol 2018; 103:35-44. [PMID: 30081099 DOI: 10.1016/j.biocel.2018.08.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Revised: 07/29/2018] [Accepted: 08/02/2018] [Indexed: 12/11/2022]
Abstract
Verticillium wilt, caused by Verticillium dahliae, is a cancer of cotton which affects cotton quality and yield in China. In our previous study, a novel anti-Verticillium dahliae protein TUBP1 was obtained from Bacillus axarquiensis. Then, we have systematically studied the anti-V. dahliae activity and the pore formation action of TUBP1 protein on V. dahliae membrane. In present study, we provide detailed whether TUBP1 protein induced mitochondrial damaged and mitochondria-mediated apoptotic cell death in V. dahliae. In V. dahliae cells exposed to the TUBP1 protein, the mitochondrial dehydrogenases, F0F1-ATPase, malate dehydrogenase (MDH), and succinate dehydrogenase (SDH) activities were reduced and reactive oxygen species (ROS), which is a major cause of apoptosis, were increased. The results demonstrated that mitochondria dysfunction and ROS-induced oxidative stress caused the release of apoptotic factors. The following cellular changes, which are characteristic of apoptosis, were measured including mitochondrial membrane potential (MMP), Cytochrome c (Cyt C) release, metacaspase activation, phosphatidylserine (PS) exposure, and DNA condensation and fragmentation. The results showed that an important feature of apoptosis, MMP, was caused by ROS. Significantly, cyt c was released, which is a factor in metacaspase activity after treatment with the TUBP1 protein. Number of stained cells with activated intracellular metacaspases exposed to TUBP1 protein was increased in a concentration-dependent manner. We also showed that in the early and late stages of apoptosis, the effects of the TUBP1 protein were mediated by PS and DNA fragmentation and condensation in the plasma membrane, respectively. There turned out that the TUBP1 protein led to mitochondria-mediated apoptotic cell death in V.dahliae. The results of this investigation indicated that TUBP1 stain or protein is a potent candidate against V.dahliae infections in crop species.
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Zeng H, Chen X, Liang J. In vitro antifungal activity and mechanism of essential oil from fennel (Foeniculum vulgare L.) on dermatophyte species. J Med Microbiol 2014; 64:93-103. [PMID: 25351709 DOI: 10.1099/jmm.0.077768-0] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Fennel seed essential oil (FSEO) is a plant-derived natural therapeutic against dermatophytes. In this study, the antifungal effects of FSEO were investigated from varied aspects, such as MIC and minimum fungicidal concentration, mycelia growth, spore germination and biomass. The results indicated that FSEO had potent antifungal activities on Trichophyton rubrum ATCC 40051, Trichophyton tonsurans 10-0400, Microsporum gypseum 44693-1 and Trichophyton mentagrophytes 10-0060, which is better than the commonly used antifungal agents fluconazole and amphotericin B. Flow cytometry and transmission electron microscopy experiments suggested that the antifungal mechanism of FSEO was to damage the plasma membrane and intracellular organelles. Further study revealed that it could also inhibit the mitochondrial enzyme activities, such as succinate dehydrogenase, malate dehydrogenase and ATPase. With better antifungal activity than the commonly used antifungal agents and less possibility of inducing drug resistance, FSEO could be used as a potential antidermatophytic agent.
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Affiliation(s)
- Hong Zeng
- Key Laboratory of Protection and Utilization of Biological Resources, College of Life Science, Tarim University, Alar, 843300, Xinjiang, PR China
| | - Xinping Chen
- Key Laboratory of Protection and Utilization of Biological Resources, College of Life Science, Tarim University, Alar, 843300, Xinjiang, PR China
| | - Jingnan Liang
- Instrument Center, Institute of Microbiology, Chinese Academy of Sciences, 100000 Beijing, PR China
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Chen Y, Zeng H, Tian J, Ban X, Ma B, Wang Y. Antifungal mechanism of essential oil from Anethum graveolens seeds against Candida albicans. J Med Microbiol 2013; 62:1175-1183. [DOI: 10.1099/jmm.0.055467-0] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
This work studied the antifungal mechanism of dill seed essential oil (DSEO) against Candida albicans. Flow cytometric analysis and inhibition of ergosterol synthesis were performed to clarify the mechanism of action of DSEO on C. albicans. Upon treatment of cells with DSEO, propidium iodide penetrated C. albicans through a lesion in its plasma membrane. DSEO also significantly reduced the amount of ergosterol. These findings indicate that the plasma membrane of C. albicans was damaged by DSEO. The effect of DSEO on the functions of the mitochondria in C. albicans was also studied. We assayed the mitochondrial membrane potential (mtΔψ) using rhodamine 123 and determined the production of mitochondrial dysfunction-induced reactive oxygen species (ROS) via flow cytometry. The effects of the antioxidant l-cysteine (Cys) on DSEO-induced ROS production and the antifungal effect of DSEO on C. albicans were investigated. Exposure to DSEO increased mtΔψ. Dysfunctions in the mitochondria caused ROS accumulation in C. albicans. This increase in the level of ROS production and DSEO-induced decrease in cell viability were prevented by the addition of Cys, indicating that ROS are an important mediator of the antifungal action of DSEO. These findings indicate that the cytoplasmic membrane and mitochondria are the main anti-Candida targets of DSEO.
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Affiliation(s)
- Yuxin Chen
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (Wuhan University), Ministry of Education, and Institute of TCM & Natural Products, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, PR China
| | - Hong Zeng
- Key Laboratory of Protection and Utilization of Biological Resources, Tarim University, Alar, 843300, Xinjiang, PR China
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (Wuhan University), Ministry of Education, and Institute of TCM & Natural Products, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, PR China
| | - Jun Tian
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (Wuhan University), Ministry of Education, and Institute of TCM & Natural Products, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, PR China
| | - Xiaoquan Ban
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (Wuhan University), Ministry of Education, and Institute of TCM & Natural Products, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, PR China
| | - Bingxin Ma
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (Wuhan University), Ministry of Education, and Institute of TCM & Natural Products, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, PR China
| | - Youwei Wang
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (Wuhan University), Ministry of Education, and Institute of TCM & Natural Products, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, PR China
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Tian J, Ban X, Zeng H, He J, Chen Y, Wang Y. The mechanism of antifungal action of essential oil from dill (Anethum graveolens L.) on Aspergillus flavus. PLoS One 2012; 7:e30147. [PMID: 22272289 PMCID: PMC3260232 DOI: 10.1371/journal.pone.0030147] [Citation(s) in RCA: 188] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2011] [Accepted: 12/12/2011] [Indexed: 12/15/2022] Open
Abstract
The essential oil extracted from the seeds of dill (Anethum graveolens L.) was demonstrated in this study as a potential source of an eco-friendly antifungal agent. To elucidate the mechanism of the antifungal action further, the effect of the essential oil on the plasma membrane and mitochondria of Aspergillus flavus was investigated. The lesion in the plasma membrane was detected through flow cytometry and further verified through the inhibition of ergosterol synthesis. The essential oil caused morphological changes in the cells of A. flavus and a reduction in the ergosterol quantity. Moreover, mitochondrial membrane potential (MMP), acidification of external medium, and mitochondrial ATPase and dehydrogenase activities were detected. The reactive oxygen species (ROS) accumulation was also examined through fluorometric assay. Exposure to dill oil resulted in an elevation of MMP, and in the suppression of the glucose-induced decrease in external pH at 4 µl/ml. Decreased ATPase and dehydrogenase activities in A. flavus cells were also observed in a dose-dependent manner. The above dysfunctions of the mitochondria caused ROS accumulation in A. flavus. A reduction in cell viability was prevented through the addition of L-cysteine, which indicates that ROS is an important mediator of the antifungal action of dill oil. In summary, the antifungal activity of dill oil results from its ability to disrupt the permeability barrier of the plasma membrane and from the mitochondrial dysfunction-induced ROS accumulation in A. flavus.
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Affiliation(s)
- Jun Tian
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, School of Pharmaceutical Sciences, Institute of Traditional Chinese Medicine & Natural Products, Wuhan University, Wuhan, P. R. China
| | - Xiaoquan Ban
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, School of Pharmaceutical Sciences, Institute of Traditional Chinese Medicine & Natural Products, Wuhan University, Wuhan, P. R. China
| | - Hong Zeng
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, School of Pharmaceutical Sciences, Institute of Traditional Chinese Medicine & Natural Products, Wuhan University, Wuhan, P. R. China
| | - Jingsheng He
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, School of Pharmaceutical Sciences, Institute of Traditional Chinese Medicine & Natural Products, Wuhan University, Wuhan, P. R. China
| | - Yuxin Chen
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, School of Pharmaceutical Sciences, Institute of Traditional Chinese Medicine & Natural Products, Wuhan University, Wuhan, P. R. China
| | - Youwei Wang
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, School of Pharmaceutical Sciences, Institute of Traditional Chinese Medicine & Natural Products, Wuhan University, Wuhan, P. R. China
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Balietti M, Fattoretti P, Giorgetti B, Casoli T, Di Stefano G, Solazzi M, Platano D, Aicardi G, Bertoni-Freddari C. A Ketogenic Diet Increases Succinic Dehydrogenase Activity in Aging Cardiomyocytes. Ann N Y Acad Sci 2009; 1171:377-84. [DOI: 10.1111/j.1749-6632.2009.04704.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Bertoni-Freddari C, Mocchegiani E, Malavolta M, Casoli T, Di Stefano G, Fattoretti P. Synaptic and mitochondrial physiopathologic changes in the aging nervous system and the role of zinc ion homeostasis. Mech Ageing Dev 2006; 127:590-6. [PMID: 16522327 DOI: 10.1016/j.mad.2006.01.019] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2005] [Revised: 10/07/2005] [Accepted: 01/16/2006] [Indexed: 11/17/2022]
Abstract
Brain performances, e.g. learning and memory, decay during aging. Deterioration of synaptic junctions, as structural correlates of these key functions of the central nervous system, may play a central role in this impairment. Current research on the age-related changes of synapses is documenting that the numeric loss of contacts appears to trigger a compensatory reaction by the old CNS, i.e. the surviving junctional areas in old individuals are larger than in adult subjects. The final outcome of the balanced changes in synaptic number and size is that the overall synaptic junctional area per cubic micron of neuropil is also reduced in aging and this may account for the age-associated functional decay of CNS performances. Among the suggested determinants of synaptic deterioration in aging, a considerable number of recent studies support an early and pivotal role of the progressive decline of the mitochondrial metabolic competence, i.e. the capacity of select pools of organelles to provide adequate amounts of adenosine triphosphate. Quantitative ultrastructural studies together with cytochemistry of key enzymes of the respiratory chain (cytochrome oxidase and succinic dehydrogenase) have shown that mitochondrial dysfunctions play an early and central role in synaptic deterioration events associated with aging and neurodegenerative diseases. Among the various causes, the multiple mechanisms and molecules involved in zinc ion homeostasis have been supposed to be less efficient in the aging brain. Thus, a transient imbalance of free zinc ion concentration in the cytosol ([Zn2+]i) can be considered an unfavourable trigger of subtle mitochondrial damage and synaptic pathology.
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