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Kaya B, Gholam Azad M, Suleymanoglu M, Harmer JR, Wijesinghe TP, Richardson V, Zhao X, Bernhardt PV, Dharmasivam M, Richardson DR. Isosteric Replacement of Sulfur to Selenium in a Thiosemicarbazone: Promotion of Zn(II) Complex Dissociation and Transmetalation to Augment Anticancer Efficacy. J Med Chem 2024; 67:12155-12183. [PMID: 38967641 DOI: 10.1021/acs.jmedchem.4c00884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/06/2024]
Abstract
We implemented isosteric replacement of sulfur to selenium in a novel thiosemicarbazone (PPTP4c4mT) to create a selenosemicarbazone (PPTP4c4mSe) that demonstrates potentiated anticancer efficacy and selectivity. Their design specifically incorporated cyclohexyl and styryl moieties to sterically inhibit the approach of their Fe(III) complexes to the oxy-myoglobin heme plane. Importantly, in contrast to the Fe(III) complexes of the clinically trialed thiosemicarbazones Triapine, COTI-2, and DpC, the Fe(III) complexes of PPTP4c4mT and PPTP4c4mSe did not induce detrimental oxy-myoglobin oxidation. Furthermore, PPTP4c4mSe demonstrated more potent antiproliferative activity than the homologous thiosemicarbazone, PPTP4c4mT, with their selectivity being superior or similar, respectively, to the clinically trialed thiosemicarbazone, COTI-2. An advantageous property of the selenosemicarbazone Zn(II) complexes relative to their thiosemicarbazone analogues was their greater transmetalation to Cu(II) complexes in lysosomes. This latter effect probably promoted their antiproliferative activity. Both ligands down-regulated multiple key receptors that display inter-receptor cooperation that leads to aggressive and resistant breast cancer.
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Affiliation(s)
- Busra Kaya
- Centre for Cancer Cell Biology and Drug Discovery, Griffith University, Nathan, Brisbane 4111, Australia
| | - Mahan Gholam Azad
- Centre for Cancer Cell Biology and Drug Discovery, Griffith University, Nathan, Brisbane 4111, Australia
| | - Mediha Suleymanoglu
- Centre for Cancer Cell Biology and Drug Discovery, Griffith University, Nathan, Brisbane 4111, Australia
- Department of Medical Biology, Istanbul Faculty of Medicine, Istanbul University, Fatih, Istanbul 34093, Turkey
| | - Jeffrey R Harmer
- Centre for Advanced Imaging, University of Queensland, Brisbane 4072, Australia
| | - Tharushi P Wijesinghe
- Centre for Cancer Cell Biology and Drug Discovery, Griffith University, Nathan, Brisbane 4111, Australia
| | - Vera Richardson
- Centre for Cancer Cell Biology and Drug Discovery, Griffith University, Nathan, Brisbane 4111, Australia
| | - Xiao Zhao
- Centre for Cancer Cell Biology and Drug Discovery, Griffith University, Nathan, Brisbane 4111, Australia
| | - Paul V Bernhardt
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane 4072, Australia
| | - Mahendiran Dharmasivam
- Centre for Cancer Cell Biology and Drug Discovery, Griffith University, Nathan, Brisbane 4111, Australia
| | - Des R Richardson
- Centre for Cancer Cell Biology and Drug Discovery, Griffith University, Nathan, Brisbane 4111, Australia
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya 466-8550, Japan
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Ndlovu SS, Chuturgoon AA, Ghazi T. Moringa oleifera Lam Leaf Extract Stimulates NRF2 and Attenuates ARV-Induced Toxicity in Human Liver Cells (HepG2). PLANTS (BASEL, SWITZERLAND) 2023; 12:1541. [PMID: 37050167 PMCID: PMC10097004 DOI: 10.3390/plants12071541] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/12/2023] [Revised: 03/22/2023] [Accepted: 03/28/2023] [Indexed: 06/19/2023]
Abstract
The World Health Organization (WHO) reported that there are 37 million individuals living with the human immunodeficiency virus (HIV) worldwide, with the majority in South Africa. This chronic disease is managed by the effective use of antiretroviral (ARV) drugs. However, with prolonged use, ARV drug-induced toxicity remains a clinically complex problem. This study investigated the toxicity of ARV drugs on mitochondria and the NRF2 antioxidant pathway and its possible amelioration using Moringa oleifera Lam (MO) leaf extracts. This medicinal plant has a range of functional bioactive compounds. Liver (HepG2) cells were treated with individual ARV drugs: Tenofovir disoproxil fumarate (TDF), Emtricitabine (FTC), and Lamivudine (3TC) for 96 h, followed by MO leaf extracts for 24 h. Intracellular ROS, cytotoxicity, lipid peroxidation, total and reduced glutathione (GSH), ATP, and mitochondrial polarisation were determined. Finally, protein (pNRF2, NRF2, SOD2, CAT, and Sirt3) and mRNA (NRF2, CAT, NQO1 SOD2, Sirt3, and PGC1α) expression were measured using Western blot and qPCR, respectively. TDF, FTC, and 3TC significantly increased intracellular ROS and extracellular levels of both MDA and LDH. ARVs also reduced the GSH and ATP levels and altered the mitochondrial polarization. Further, ARVs reduced the expression of NRF2 SOD2, Sirt3, CAT, NQO1, UCP2 and PGC1α mRNA and consequently pNRF2, NRF2, SOD2, Sirt3 and CAT protein. In contrast, there was a significant reduction in the extracellular MDA and LDH levels post-MO treatment. MO significantly reduced intracellular ROS while significantly increasing GSH, ATP, and mitochondrial membrane polarization. The addition of MO to ARV-treated cells significantly upregulated the expression of NRF2, SOD2, Sirt3, CAT, UCP2, PGC1α, and NQO1 mRNA and pNRF2, NRF2, SOD2, Sirt3 proteins. Thus, MO ameliorates ARV-induced hepatotoxicity by scavenging oxidants by inducing the NRF2 antioxidant pathway. MO shows great therapeutic potential and may be considered a potential supplement to ameliorate ARV drug toxicity.
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de Celis M, Belda I, Marquina D, Santos A. Phenotypic and transcriptional study of the antimicrobial activity of silver and zinc oxide nanoparticles on a wastewater biofilm-forming Pseudomonas aeruginosa strain. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 826:153915. [PMID: 35219669 DOI: 10.1016/j.scitotenv.2022.153915] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Revised: 02/11/2022] [Accepted: 02/12/2022] [Indexed: 06/14/2023]
Abstract
The extensive use of nanoparticles (NPs) in industrial processes makes their potential release into the environment an issue of concern. Ag and ZnO NPs are among the most frequently used NPs, potentially reaching concentrations of 1-4 and 64 mg/kg, respectively, in Wastewater Treatment Plants (WWTPs), with unknown effects over microbial populations. Thus, we examined, in depth, the effect of such NPs on a P. aeruginosa strain isolated from a WWTP. We evaluated the growth, ROS production and biofilm formation, in addition to the transcriptomic response in presence of Ag and ZnO NPs at concentrations potentially found in sewage sludge. The transcriptomic and phenotypic patterns of P. aeruginosa in presence of Ag NPs were, in general, similar to the control treatment, with some specific transcriptional impacts affecting processes involved in biofilm formation and iron homeostasis. The biofilms formed under Ag NPs treatment were, on average, thinner and more homogeneous. ZnO NPs also alters the biofilm formation and iron homeostasis in P. aeruginosa, however, the higher and more toxic concentrations utilized caused an increase in cell death and eDNA release. Thus, the biofilm development was characterized by EPS production, via eDNA release. The number of differentially expressed genes in presence of ZnO NPs was higher compared to Ag NPs treatment. Even though the responses of P. aeruginosa to the presence of the studied metallic NPs was at some extent similar, the higher and more toxic concentrations of ZnO NPs produced greater changes concerning cell viability and ROS production, causing disruption in biofilm development.
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Affiliation(s)
- M de Celis
- Department of Genetics, Physiology and Microbiology, Microbiology Unit, Faculty of Biology, Complutense University of Madrid, José Antonio Novais 12, 28040 Madrid, Spain
| | - I Belda
- Department of Genetics, Physiology and Microbiology, Microbiology Unit, Faculty of Biology, Complutense University of Madrid, José Antonio Novais 12, 28040 Madrid, Spain
| | - D Marquina
- Department of Genetics, Physiology and Microbiology, Microbiology Unit, Faculty of Biology, Complutense University of Madrid, José Antonio Novais 12, 28040 Madrid, Spain
| | - A Santos
- Department of Genetics, Physiology and Microbiology, Microbiology Unit, Faculty of Biology, Complutense University of Madrid, José Antonio Novais 12, 28040 Madrid, Spain.
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Heyman L, Ferrarini E, Sanchez L, Barka EA, Höfte M. A sensitive chemiluminescence method for quantification of the oxidative burst in grapevine cells and rice roots. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2021; 307:110892. [PMID: 33902853 DOI: 10.1016/j.plantsci.2021.110892] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Revised: 03/18/2021] [Accepted: 03/21/2021] [Indexed: 06/12/2023]
Abstract
Roots are prominent plant-microbe interaction sites and of great biological relevance for many studies. The root response is of interest when searching for potential systemic resistance inducers. Screening of elicitors often focuses on the oxidative burst, the rapid and transient production of Reactive Oxygen Species (ROS). However, to our knowledge, no high-throughput, sensitive methods have been developed for the quantification of ROS released by roots. Here, we report on the development of an L-012-based chemiluminescence bioassay to quantitatively determine the oxidative burst following elicitation events in roots. Rice and grapevine were used as monocot and dicot models. We demonstrate that chitosan, a recognized elicitor in rice cells, was able to elicit ROS production in rice roots. Chitosan also triggered a strong oxidative burst in grapevine cell suspension cultures, while grapevine roots were not responsive. Although this method is broadly applicable, the L-012 probe requires careful consideration of solvents and plant species. Insufficient extracellular ROS, quenching, and the interference of solvents with the probe can undermine the assay sensitivity.
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Affiliation(s)
- Lisa Heyman
- Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium.
| | - Enrico Ferrarini
- Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium.
| | - Lisa Sanchez
- RIBP-EA 4707, SFR Condorcet FR CNRS 3417, University of Reims Champagne-Ardenne, Reims, France.
| | - Essaid Ait Barka
- RIBP-EA 4707, SFR Condorcet FR CNRS 3417, University of Reims Champagne-Ardenne, Reims, France.
| | - Monica Höfte
- Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium.
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Liu Z, Mukherjee M, Wu Y, Huang Q, Cai P. Increased particle size of goethite enhances the antibacterial effect on human pathogen Escherichia coli O157:H7: A Raman spectroscopic study. JOURNAL OF HAZARDOUS MATERIALS 2021; 405:124174. [PMID: 33144022 DOI: 10.1016/j.jhazmat.2020.124174] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 09/13/2020] [Accepted: 10/01/2020] [Indexed: 06/11/2023]
Abstract
The persistence of Escherichia coli O157:H7 in soil is one of the most common causes of the food-borne outbreaks. Nano-sized iron oxide minerals in soil, especially goethite, have been found to reduce bacterial viability, which helps to control the spread of human pathogens. However, little is known about the antibacterial effects of iron oxides with different particle sizes. Our result revealed that the micro-sized goethite exhibited a more effective antibacterial activity against E. coli O157:H7 than the nano-sized goethite. The underlying antibacterial mechanisms were further investigated via single-cell Raman microspectroscopy. The exposure to nano-sized goethite increased the levels of ribonucleoside-related substances, phenylalanine and adenosine 5'-triphosphate, while decreased those of glycogen, protein and lipopolysaccharide & outer membrane porins (LPS & OMPs). Meanwhile, micro-sized goethite triggered less variation in ribonucleoside-related substances and induced more reduction in LPS & OMPs. Therefore, the antibacterial effects of nano-sized goethite were mediated by both ROS-dependent RNA damage and cell membrane destruction, whereas micro-sized goethite induced severer membrane damage and less ROS-dependent oxidative stress. This work demonstrates the role of particle sizes in antibacterial effects of iron oxides and provides implications for the pathogen control in soil.
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Affiliation(s)
- Zhourui Liu
- State Key Laboratory of Agricultural Microbiology, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
| | - Manisha Mukherjee
- Singapore Centre for Environmental Life Sciences Engineering, Interdisciplinary Graduate School and School of Civil and Environmental Engineering, Nanyang Technological University, 637551, Singapore; School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
| | - Yichao Wu
- State Key Laboratory of Agricultural Microbiology, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.
| | - Qiaoyun Huang
- State Key Laboratory of Agricultural Microbiology, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
| | - Peng Cai
- State Key Laboratory of Agricultural Microbiology, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.
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Wan JK, Chu WL, Kok YY, Lee CS. Influence of polystyrene microplastic and nanoplastic on copper toxicity in two freshwater microalgae. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:10.1007/s11356-021-12983-x. [PMID: 33646549 DOI: 10.1007/s11356-021-12983-x] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Accepted: 02/11/2021] [Indexed: 05/09/2023]
Abstract
There has been increasing concern over the toxic effects of microplastics (MP), nanoplastics (NP), and copper (Cu) on microalgae. However, the combined toxicity of the metal in the presence of polystyrene (PS) MP/NP on microalgae has not been well studied, particularly after long-term exposure (i.e., longer than 4 days). The primary aim of the present study was to investigate the effect of PS MP and NP on Cu toxicity on two freshwater microalgae, namely Chlorella sp. TJ6-5 and Pseudokirchneriella subcapitata NIES-35 after acute exposure for 4 days and up to 16 days. The results showed that both microalgae were sensitive to Cu, but tolerant to MP/NP. However, MP/NP increased the toxicity of Cu at EC50 in both microalgae, which was only noticeable in chronic exposure. Single and combined treatment of MP/NP and Cu induced higher oxidative stress and caused morphological and ultrastructural changes in both microalgae. The adsorption of Cu to MP and NP was low (0.23-14.9%), with most of the Cu present in free ionic form (81.6-105.8%). The findings on different sensitivity of microalgae to Cu in the presence of MP/NP may have significant implication as microalgae are likely to be exposed to a mixture of both MP/NP and Cu in the environment. For example, in air-blasting technology, MP and NP are used as abrasive medium to remove Cu-containing antifouling paints on hulls of ship and submerged surfaces. Wastewater treatment plants receive household wastes containing MP and NP, as well as stormwater runoffs and industrial wastes contaminated with heavy metals.
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Affiliation(s)
- Jun-Kit Wan
- School of Postgraduate Studies, International Medical University, 126 Jalan Jalil Perkasa 19, Bukit Jalil, 57000, Kuala Lumpur, Malaysia.
| | - Wan-Loy Chu
- School of Postgraduate Studies, International Medical University, 126 Jalan Jalil Perkasa 19, Bukit Jalil, 57000, Kuala Lumpur, Malaysia
| | - Yih-Yih Kok
- Division of Applied Biomedical Sciences and Biotechnology, School of Health Sciences, International Medical University, 126 Jalan Jalil Perkasa 19, Bukit Jalil, 57000, Kuala Lumpur, Malaysia
| | - Choy-Sin Lee
- Department of Pharmaceutical Chemistry, School of Pharmacy, International Medical University, 126 Jalan Jalil Perkasa 19, Bukit Jalil, 57000, Kuala Lumpur, Malaysia
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7
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Cao T, Ling J, Liu Y, Chen X, Tian X, Meng D, Pan H, Hu J, Wang N. Characterization and abolishment of the cyclopiazonic acids produced by Aspergillus oryzae HMP-F28. Biosci Biotechnol Biochem 2018; 82:1832-1839. [PMID: 29985105 DOI: 10.1080/09168451.2018.1490170] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Extracellular alkalinization and H2O2 production are important early events during induced resistance establishment in plants. In a screen for metabolites as plant resistance activators from 98 fungal isolates associated with marine sponge Hymeniacidon perleve, the cyclopiazonic acids (CPAs) produced by Aspergillus oryzae HMP-F28 induced significant extracellular alkalinization coupled with augmented H2O2 production in tobacco cell suspensions. Bioassay-guided fractionation led to the isolation and structural elucidation of a new CPA congener (4, 3-hydroxysperadine A) and three known ones (1-3). To construct a mutasynthetic strain to generate unnatural CPA analogues, a hybrid pks-nrps gene (cpaS) was disrupted to abolish the production of the critical precursor of cyclo-acetoacetyl-L-tryptophan (cAATrp) and all the downstream CPA products. Elimination of cAATrp will allow cAATrp mimics being processed by the CPA biosynthetic machinery to produce CPA derivatives with designed structural features.
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Affiliation(s)
- Ting Cao
- a Institute of Applied Ecology , Chinese Academy of Sciences , Shenyang , China.,b College of Life Sciences , University of Chinese Academy of Sciences , Beijing , China
| | - Junhong Ling
- c School of Traditional Chinese Materia Medica , Shenyang Pharmaceutical University , Shenyang , China
| | - Yi Liu
- a Institute of Applied Ecology , Chinese Academy of Sciences , Shenyang , China.,c School of Traditional Chinese Materia Medica , Shenyang Pharmaceutical University , Shenyang , China
| | - Xiaoqi Chen
- a Institute of Applied Ecology , Chinese Academy of Sciences , Shenyang , China.,b College of Life Sciences , University of Chinese Academy of Sciences , Beijing , China
| | - Xiaoyue Tian
- a Institute of Applied Ecology , Chinese Academy of Sciences , Shenyang , China.,c School of Traditional Chinese Materia Medica , Shenyang Pharmaceutical University , Shenyang , China
| | - Dali Meng
- c School of Traditional Chinese Materia Medica , Shenyang Pharmaceutical University , Shenyang , China
| | - Huaqi Pan
- a Institute of Applied Ecology , Chinese Academy of Sciences , Shenyang , China
| | - Jiangchun Hu
- a Institute of Applied Ecology , Chinese Academy of Sciences , Shenyang , China
| | - Nan Wang
- a Institute of Applied Ecology , Chinese Academy of Sciences , Shenyang , China
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Zahid A, Jaber R, Laggoun F, Lehner A, Remy-Jouet I, Pamlard O, Beaupierre S, Leprince J, Follet-Gueye ML, Vicré-Gibouin M, Latour X, Richard V, Guillou C, Lerouge P, Driouich A, Mollet JC. Holaphyllamine, a steroid, is able to induce defense responses in Arabidopsis thaliana and increases resistance against bacterial infection. PLANTA 2017; 246:1109-1124. [PMID: 28815300 DOI: 10.1007/s00425-017-2755-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Accepted: 08/05/2017] [Indexed: 06/07/2023]
Abstract
MAIN CONCLUSION A chemical screen of plant-derived compounds identified holaphyllamine, a steroid, able to trigger defense responses in Arabidopsis thaliana and improve resistance against the pathogenic bacterium Pseudomonas syringae pv tomato DC3000. A chemical screen of 1600 plant-derived compounds was conducted and allowed the identification of a steroid able to activate defense responses in A. thaliana at a concentration of 1 µM without altering growth. The identified compound is holaphyllamine (HPA) whose chemical structure is similar to steroid pregnanes of mammals. Our data show that HPA, which is not constitutively present in A. thaliana, is able to trigger the formation of reactive oxygen species, deposition of callose and expression of several pathogenesis-related genes of the salicylic and jasmonic acid pathways. In addition, the results show that pre-treatment of A. thaliana seedlings with HPA before infection with the pathogenic bacterium Pseudomonas syringae pv tomato DC3000 results in a significant reduction of symptoms (i.e., reduction of bacterial colonies). Using A. thaliana mutants, we have found that the activation of defense responses by HPA does not depend on BRI1/BAK1 receptor kinases. Finally, a structure/function study reveals that the minimal structure required for activity is a 5-pregnen-20-one steroid with an equatorial nucleophilic group in C-3. Together, these findings demonstrate that HPA can activate defense responses that lead to improved resistance against bacterial infection in A. thaliana.
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Affiliation(s)
- Abderrakib Zahid
- Normandie Univ, UniRouen, Laboratoire Glycobiologie et Matrice Extracellulaire végétale, SFR Normandie Végétal, 76000, Rouen, France
- SATT Nord, GIS PhyNoPi CS80699, 62229, Calais, France
| | - Rim Jaber
- Normandie Univ, UniRouen, Laboratoire Glycobiologie et Matrice Extracellulaire végétale, SFR Normandie Végétal, 76000, Rouen, France
| | - Ferdousse Laggoun
- Normandie Univ, UniRouen, Laboratoire Glycobiologie et Matrice Extracellulaire végétale, SFR Normandie Végétal, 76000, Rouen, France
| | - Arnaud Lehner
- Normandie Univ, UniRouen, Laboratoire Glycobiologie et Matrice Extracellulaire végétale, SFR Normandie Végétal, 76000, Rouen, France
| | - Isabelle Remy-Jouet
- Normandie Univ, UniRouen, Laboratoire Nouvelles Cibles Pharmacologiques du Traitement de la Dysfonction Endothéliale et de l'Insuffisance Cardiaque, INSERM, IRIB, 76000, Rouen, France
| | - Olivier Pamlard
- Institut de Chimie des Substances Naturelles, CNRS, LabEx LERMIT, 91198, Gif-sur-Yvette, France
| | - Sandra Beaupierre
- Institut de Chimie des Substances Naturelles, CNRS, LabEx LERMIT, 91198, Gif-sur-Yvette, France
| | - Jérome Leprince
- Normandie Univ, UniRouen, Laboratoire de Différenciation et Communication Neuronale et Neuroendocrine INSERM, IRIB, 76000, Rouen, France
| | - Marie-Laure Follet-Gueye
- Normandie Univ, UniRouen, Laboratoire Glycobiologie et Matrice Extracellulaire végétale, SFR Normandie Végétal, 76000, Rouen, France
| | - Maïté Vicré-Gibouin
- Normandie Univ, UniRouen, Laboratoire Glycobiologie et Matrice Extracellulaire végétale, SFR Normandie Végétal, 76000, Rouen, France
| | - Xavier Latour
- Normandie Univ, UniRouen, IUT Evreux, Laboratoire de Microbiologie Signaux et Microenvironnement, SFR Normandie Végétal, 76000, Rouen, France
| | - Vincent Richard
- Normandie Univ, UniRouen, Laboratoire Nouvelles Cibles Pharmacologiques du Traitement de la Dysfonction Endothéliale et de l'Insuffisance Cardiaque, INSERM, IRIB, 76000, Rouen, France
| | - Catherine Guillou
- Institut de Chimie des Substances Naturelles, CNRS, LabEx LERMIT, 91198, Gif-sur-Yvette, France
| | - Patrice Lerouge
- Normandie Univ, UniRouen, Laboratoire Glycobiologie et Matrice Extracellulaire végétale, SFR Normandie Végétal, 76000, Rouen, France
| | - Azeddine Driouich
- Normandie Univ, UniRouen, Laboratoire Glycobiologie et Matrice Extracellulaire végétale, SFR Normandie Végétal, 76000, Rouen, France
| | - Jean-Claude Mollet
- Normandie Univ, UniRouen, Laboratoire Glycobiologie et Matrice Extracellulaire végétale, SFR Normandie Végétal, 76000, Rouen, France.
- Normandie Univ, UniRouen, Laboratoire Glycobiologie et Matrice Extracellulaire végétale (Glyco-MEV) EA4358, 76821, Mont-Saint-Aignan, France.
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9
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Tiwari M, Venkatachalam P, Penarrubia L, Sahi SV. COPT2, a plasma membrane located copper transporter, is involved in the uptake of Au in Arabidopsis. Sci Rep 2017; 7:11430. [PMID: 28900233 PMCID: PMC5595958 DOI: 10.1038/s41598-017-11896-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Accepted: 08/31/2017] [Indexed: 01/01/2023] Open
Abstract
The mechanism of gold nanoparticle formation and genes involved in such processes, especially Au transport in plants are not understood. Previous reports pointed to the probable role of COPT2 in Au transport based on the transcript accumulation of COPT2 under Au exposure. Here, we provide evidence revealing the additional role of COPT2 for Au mobilization in yeast and Arabidopsis. The COPT2 transcripts significantly accumulated in the root of Arabidopsis under Au exposure. The expression of COPT2 restores Cu uptake ability in ctr1Δctr3Δ mutants and leads to Au sensitivity in yeast, which is comparable to Cu in growth kinetics experiments. The metal measurement data showed that the Au level was increased in COPT2, expressing yeast cells compared to vector transformed control. The copt2 mutant of Arabidopsis displayed a similar growth pattern to that of Col-0 under Au treatment. However, a notable phenotypic difference was noticed in three-week-old plants treated with and without Au. Consistent with yeast, Au uptake was reduced in the copt2 mutant of Arabidopsis. Together, these results clearly reveal the Au uptake capability of COPT2 in yeast and Arabidopsis. This is the first report showing the potential role of any transporter towards uptake and accumulation of Au in plants.
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Affiliation(s)
- Manish Tiwari
- Department of Biology, Western Kentucky University, 1906 College Heights, Bowling Green, 42101-1080, Kentucky, USA.,Department of Plant Systems Biology, VIB, Ghent University, Gent, 9000, Belgium
| | | | - Lola Penarrubia
- Departament de Bioquímicai Biologia Molecular Facultat de Biologia Universitat de València Ave. Doctor Moliner, 50 E-46100, Burjassot, Valencia, Spain
| | - Shivendra V Sahi
- Department of Biology, Western Kentucky University, 1906 College Heights, Bowling Green, 42101-1080, Kentucky, USA.
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10
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Melcher RLJ, Moerschbacher BM. An improved microtiter plate assay to monitor the oxidative burst in monocot and dicot plant cell suspension cultures. PLANT METHODS 2016; 12:5. [PMID: 26819624 PMCID: PMC4729151 DOI: 10.1186/s13007-016-0110-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2015] [Accepted: 01/14/2016] [Indexed: 05/20/2023]
Abstract
BACKGROUND A screening method for elicitor and priming agents does not only allow detecting new bioactive substances, it can also be used to understand structure-function relationships of known agents by testing different derivatives of them. This can not only provide new lead compounds for the development of novel, more environment-benign, bio-based agro-chemicals, it may eventually also lead to a better understanding of defense mechanisms in plants. Reactive oxygen species (ROS) are sensitive indicators of these mechanisms but current assay formats are not suitable for multiplex screening, in particularly not in the case of monocot systems. RESULTS Here we describe continuous monitoring of ROS in 96-well microtiter plates using the chemiluminescent probe L012, a luminol derivative producing chemiluminescence when oxidised by ROS like hydrogen peroxide, superoxide, or hydroxyl radical that can thus be used as an indicator for these ROS. We were able to measure ROS in both monocot (Oryza sativa) and dicot (Medicago truncatula) cell suspension cultures and record dose dependencies for the carbohydrate elicitors and priming agents ulvan and chitosan at low substrate concentrations (0.3-2.5 µg/ml). The method was optimized in terms of cell density, L012 concentration, and pre-incubation time. In contrast to the single peak observed using a cuvette luminometer, the improved method revealed a double burst in both cell systems during the 90-min measuring period, probably due to the detection of multiple ROS rather than only H2O2. CONCLUSION We provide a medium throughput screening method for monocot and dicot suspension-cultured cells that enables direct comparison of monocot and dicot plant systems regarding their reaction to different signaling molecules.
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Affiliation(s)
- Rebecca L. J. Melcher
- Institute for Biology and Biotechnology of Plants, University of Münster, Schlossplatz 8, 48143 Münster, Germany
| | - Bruno M. Moerschbacher
- Institute for Biology and Biotechnology of Plants, University of Münster, Schlossplatz 8, 48143 Münster, Germany
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11
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Gélinas M, Pham TTH, Boëns B, Adjallé K, Barnabé S. Residual corn crop hydrolysate and silage juice as alternative carbon sources in microalgae production. ALGAL RES 2015. [DOI: 10.1016/j.algal.2015.08.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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12
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Toxic effects of nickel oxide bulk and nanoparticles on the aquatic plant Lemna gibba L. BIOMED RESEARCH INTERNATIONAL 2015; 2015:501326. [PMID: 26075242 PMCID: PMC4449884 DOI: 10.1155/2015/501326] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Revised: 09/14/2014] [Accepted: 09/29/2014] [Indexed: 11/21/2022]
Abstract
The aquatic plant Lemna gibba L. was used to investigate and compare the toxicity induced by 30 nm nickel oxide nanoparticles (NiO-NPs) and nickel(II) oxide as bulk (NiO-Bulk). Plants were exposed during 24 h to 0–1000 mg/L of NiO-NPs or NiO-Bulk. Analysis of physicochemical characteristics of nanoparticles in solution indicated agglomerations of NiO-NPs in culture medium and a wide size distribution was observed. Both NiO-NPs and NiO-Bulk caused a strong increase in reactive oxygen species (ROS) formation, especially at high concentration (1000 mg/L). These results showed a strong evidence of a cellular oxidative stress induction caused by the exposure to NiO. Under this condition, NiO-NPs and NiO-Bulk induced a strong inhibitory effect on the PSII quantum yield, indicating an alteration of the photosynthetic electron transport performance. Under the experimental conditions used, it is clear that the observed toxicity impact was mainly due to NiO particles effect. Therefore, results of this study permitted determining the use of ROS production as an early biomarker of NiO exposure on the aquatic plant model L. gibba used in toxicity testing.
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Chen X, Mou Y, Ling J, Wang N, Wang X, Hu J. Cyclic dipeptides produced by fungus Eupenicillium brefeldianum HMP-F96 induced extracellular alkalinization and H2O 2 production in tobacco cell suspensions. World J Microbiol Biotechnol 2015; 31:247-53. [PMID: 25344087 DOI: 10.1007/s11274-014-1759-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Accepted: 10/13/2014] [Indexed: 11/28/2022]
Abstract
Extracellular alkalinization and H2O2 production are important early events during induced systemic resistance (ISR) establishment in plants. In a screen for metabolites as potential ISR activators from 98 fungal isolates associated with marine sponge Hymeniacidon perleve, the crude metabolites of fungus Eupenicillium brefeldianum HMP-F96 induced significant extracellular alkalinization coupled with H2O2 production in tobacco cell suspensions. A combined bioactivity and (1)H NMR-guided fractionation approach was used to disclose the chemical determinants responsible for the activities. Eight cyclic dipeptides were purified from the fermentation broth of the strain and were structurally characterized by NMR and MS experiments. This study represents the first report of the occurrence of cyclic dipeptides in E. brefeldianum and of their activities of inducing extracellular alkalinization and H2O2 production in tobacco cell suspensions.
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Affiliation(s)
- Xiaoqi Chen
- Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China
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Madala NE, Piater LA, Steenkamp PA, Dubery IA. Multivariate statistical models of metabolomic data reveals different metabolite distribution patterns in isonitrosoacetophenone-elicited Nicotiana tabacum and Sorghum bicolor cells. SPRINGERPLUS 2014; 3:254. [PMID: 24936386 PMCID: PMC4044000 DOI: 10.1186/2193-1801-3-254] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/02/2014] [Accepted: 05/15/2014] [Indexed: 12/22/2022]
Abstract
Isonitrosoacetophenone (INAP, 2-keto-2-phenyl-acetaldoxime) is a novel inducer of plant defense. Oxime functional groups are rare in natural products, but can serve as substrates depending on existing secondary pathways. Changes in the metabolomes of sorghum and tobacco cells treated with INAP were investigated and chemometric tools and multivariate statistical analysis were used to investigate the changes in metabolite distribution patterns resulting from INAP elicitation. Liquid chromatography combined with mass spectrometry (UHPLC-MS) supplied unique chemical fingerprints that were generated in response to specific metabolomic events. Principal component analysis (PCA) together with hierarchical cluster analysis (HCA) and Metabolic Trees were used for data visualization. Orthogonal projections to latent structures discriminant analysis (OPLS-DA) and shared and unique structure (SUS) plots were exploited in parallel to reveal the changes in the metabolomes. PCA indicated that the cells responded differentially to INAP through changes in the metabolite profiles. Furthermore, HCA and Metabolic Trees showed that INAP induced metabolic perturbations in both cell lines and that homeostasis was re-established over time. OPLS-DA-based shared and unique structure (SUS) plots confirmed the results and revealed differences in the metabolites distribution patterns between tobacco and sorghum cells. Chemometric analyses of metabolomic data offers insight into changes in metabolism in response to chemical elicitation. Although similar, the response in sorghum cells was found to be more consistent and well-coordinated when compared to tobacco cells, indicative of the differences in secondary metabolism between cyanogenic and non-cyanogenic plants for oxime metabolism.
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Affiliation(s)
- Ntakadzeni E Madala
- Department of Biochemistry, University of Johannesburg, Auckland Park, 2006 South Africa
| | - Lizelle A Piater
- Department of Biochemistry, University of Johannesburg, Auckland Park, 2006 South Africa
| | - Paul A Steenkamp
- Department of Biochemistry, University of Johannesburg, Auckland Park, 2006 South Africa ; BioSciences division, CSIR, Pretoria, 0001 South Africa
| | - Ian A Dubery
- Department of Biochemistry, University of Johannesburg, Auckland Park, 2006 South Africa
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15
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Toxicity of superparamagnetic iron oxide nanoparticles on green alga Chlorella vulgaris. BIOMED RESEARCH INTERNATIONAL 2013; 2013:647974. [PMID: 24369015 PMCID: PMC3867878 DOI: 10.1155/2013/647974] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Revised: 10/29/2013] [Accepted: 11/04/2013] [Indexed: 02/02/2023]
Abstract
Toxicity of superparamagnetic iron oxide nanoparticles (SPION) was investigated on Chlorella vulgaris cells exposed during 72 hours to Fe3O4 (SPION-1), Co0.2Zn0.8Fe2O4 (SPION-2), or Co0.5Zn0.5Fe2O4 (SPION-3) to a range of concentrations from 12.5 to 400 μg mL−1. Under these treatments, toxicity impact was indicated by the deterioration of photochemical activities of photosynthesis, the induction of oxidative stress, and the inhibition of cell division rate. In comparison to SPION-2 and -3, exposure to SPION-1 caused the highest toxic effects on cellular division due to a stronger production of reactive oxygen species and deterioration of photochemical activity of Photosystem II. This study showed the potential source of toxicity for three SPION suspensions, having different chemical compositions, estimated by the change of different biomarkers. In this toxicological investigation, algal model C. vulgaris demonstrated to be a valuable bioindicator of SPION toxicity.
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Oukarroum A, Gaudreault MH, Pirastru L, Popovic R. Alleviation of silver toxicity by calcium chloride (CaCl2) in Lemna gibba L. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2013; 71:235-239. [PMID: 23974355 DOI: 10.1016/j.plaphy.2013.07.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Accepted: 07/29/2013] [Indexed: 06/02/2023]
Abstract
The toxicity effects of silver (Ag) and the protective role of calcium chloride (CaCl2) was studied in Lemna gibba L. (L. gibba) plants. Silver speciation showed that silver toxicity in L. gibba culture medium can be attributed to free ionic Ag(+) concentration. Frond abscission, intracellular reactive oxygen species (ROS) formation and intracellular uptake of Ag(+) were investigated when L. gibba plants were exposed to AgNO3 concentrations (0.5, 1, 5, and 10 μM) supplemented or not by 10 μM CaCl2. An increase in frond abscission, intracellular ROS and intracellular uptake of Ag(+) were detected in L. gibba plants for all tested concentrations of AgNO3 after 24 h treatment. However, addition of 10 μM CaCl2 to the L. gibba culture medium reduced the toxic effects of Ag by decreasing silver uptake into the plant and intracellular ROS formation. The results suggest that Ag-induced toxicity was attributed to Ag(+) accumulation and chloride was able to protect L. gibba plants against Ag toxicity by formation of complexes with Ag and then alleviation of the metal induced oxidative stress.
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Affiliation(s)
- Abdallah Oukarroum
- Department of Chemistry and Biochemistry, University of Québec in Montréal, Case Postal 8888, Succursale Centre-Ville, Montréal, Québec H3C 3P8, Canada.
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Tewari RK, Hadacek F, Sassmann S, Lang I. Iron deprivation-induced reactive oxygen species generation leads to non-autolytic PCD in Brassica napus leaves. ENVIRONMENTAL AND EXPERIMENTAL BOTANY 2013; 91:74-83. [PMID: 23825883 PMCID: PMC3661939 DOI: 10.1016/j.envexpbot.2013.03.006] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2012] [Revised: 02/17/2013] [Accepted: 03/22/2013] [Indexed: 05/21/2023]
Abstract
Using iron-deprived (-Fe) chlorotic as well as green iron-deficient (5 μM Fe) and iron-sufficient supplied (50 μM Fe) leaves of young hydroponically reared Brassica napus plants, we explored iron deficiency effects on triggering programmed cell death (PCD) phenomena. Iron deficiency increased superoxide anion but decreased hydroxyl radical (•OH) formation (TBARS levels). Impaired photosystem II efficiency led to hydrogen peroxide accumulation in chloroplasts; NADPH oxidase activity, however, remained on the same level in all treatments. Non-autolytic PCD was observed especially in the chlorotic leaf of iron-deprived plants, to a lesser extent in iron-deficient plants. It correlated with higher DNAse-, alkaline protease- and caspase-3-like activities, DNA fragmentation and chromatin condensation, hydrogen peroxide accumulation and higher superoxide dismutase activity. A significant decrease in catalase activity together with rising levels of dehydroascorbic acid indicated a strong disturbance of the redox homeostasis, which, however, was not caused by •OH formation in concordance with the fact that iron is required to catalyse the Fenton reaction leading to •OH generation. This study documents the chain of events that contributes to the development of non-autolytic PCD in advanced stages of iron deficiency in B. napus leaves.
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Key Words
- AA, ascorbic acid
- APX, ascorbate peroxidase
- Brassica napus
- CAT, catalase
- Caspase
- DAB, 3,3′-diaminobenzidine
- DAPI, 4′,6-diamidino-2-phenylindole dihydrochloride
- DHA, dehydroascorbic acid
- DNAse, deoxyribonuclease
- DTT, 1,4-dithio-dl-threitol
- Deficiency
- Deprivation
- EDTA, ethylenediaminetetraacetic acid
- ETR, electron transport rate
- ETS, electron transport system
- Iron
- NBT, p-nitro-blue tetrazolium chloride
- PCD, programmed cell death
- POD, peroxidase
- Programmed cell death
- Reactive oxygen species
- SOD, superoxide dismutase
- TBARS, thiobarbituric acid reactive substances
- Y(II), effective quantum yield
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Affiliation(s)
- Rajesh Kumar Tewari
- Department of Terrestrial Ecosystem Research (TER), Faculty of Life Sciences, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria
| | - Franz Hadacek
- Albrecht-von-Haller Institut, Plant Biochemistry, Georg-August-Universität Göttingen, Justus-von-Liebig-Weg 11, 37077 Göttingen, Germany
| | - Stefan Sassmann
- Cell Imaging and Ultrastructure Research (CIUS), Faculty of Life Sciences, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria
| | - Ingeborg Lang
- Cell Imaging and Ultrastructure Research (CIUS), Faculty of Life Sciences, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria
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Oukarroum A, Barhoumi L, Pirastru L, Dewez D. Silver nanoparticle toxicity effect on growth and cellular viability of the aquatic plant Lemna gibba. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2013; 32:902-907. [PMID: 23341248 DOI: 10.1002/etc.2131] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2012] [Revised: 08/19/2012] [Accepted: 11/30/2012] [Indexed: 05/29/2023]
Abstract
The toxicity effect of silver nanoparticles (AgNPs) on growth and cellular viability was investigated on the aquatic plant Lemna gibba exposed over 7 d to 0, 0.01, 0.1, 1, and 10 mg/L of AgNPs. Growth inhibition was demonstrated by a significant decrease of frond numbers dependent on AgNP concentration. Under these conditions, reduction in plant cellular viability was detected for 0.1, 1, and 10 mg/L of AgNPs within 7 d of AgNPs treatment. This effect was highly correlated with the production of intracellular reactive oxygen species (ROS). A significant increase of intracellular ROS formation was triggered by 1 and 10 mg/L of AgNP exposure. The induced oxidative stress was related to Ag accumulation within L. gibba plant cells and with the increasing concentration of AgNP exposure in the medium. The authors' results clearly suggested that AgNP suspension represented a potential source of toxicity for L. gibba plant cells. Due to the low release capacity of free soluble Ag from AgNP dissolution in the medium, it is most likely that the intracellular uptake of Ag was directly from AgNPs, triggering cellular oxidative stress that may be due to the release of free Ag inside plant cells. Therefore, the present study demonstrated that AgNP accumulation in an aquatic environment may represent a potential source of toxicity and a risk for the viability of duckweeds.
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Affiliation(s)
- Abdallah Oukarroum
- Department of Chemistry, University of Quebec in Montreal, Quebec, Canada
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19
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Evaluation of cytotoxicity of 3-mercaptopropionic acid-modified quantum dots on Medicago sativa cells and tissues. Methods Mol Biol 2012; 906:435-49. [PMID: 22791455 DOI: 10.1007/978-1-61779-953-2_36] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
Like most of the new technologies designed to interact with biological systems, the applications of -nanomaterials needs a proper assessment for their potential impacts. It is only through addressing the issues raised by toxicological studies that nanotechnology will be able to acquire its full potential. Here, we describe the detailed protocols to study the responses of plant cells to their exposure to nanoparticles, including viability, oxidative stress detection, and reactive oxygen species enzymatic detoxification, as well as particle uptake.
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20
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Oukarroum A, Bras S, Perreault F, Popovic R. Inhibitory effects of silver nanoparticles in two green algae, Chlorella vulgaris and Dunaliella tertiolecta. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2012; 78:80-5. [PMID: 22138148 DOI: 10.1016/j.ecoenv.2011.11.012] [Citation(s) in RCA: 196] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2011] [Revised: 10/14/2011] [Accepted: 11/15/2011] [Indexed: 05/26/2023]
Abstract
Freshwater microalga Chlorella vulgaris and marine microalga Dunaliella tertiolecta were used to investigate toxic effects induced by 50 nm silver nanoparticles (AgNPs). To induce AgNPs effect, we exposed Chlorella vulgaris and Dunaliella tertiolecta for 24h to 0-10 mg/L. We showed that growth media had different effects in AgNPs agglomerates' formation. Cellular viability, reactive oxygen species (ROS) formation and lipids peroxidation were employed to assess the toxic effects of AgNPs. AgNPs were able to interact directly with the Chlorella vulgaris cells surface and large aggregates were observed. AgNPs have a negative effect on Chlorella vulgaris and Dunaliella tertiolecta, as manifested by a strong decrease in chlorophyll content, viable algal cells, increased ROS formation and lipids peroxidation. The variability in sensitivity of both algae towards AgNPs was observed. We conclude that AgNPs have a negative effect on aquatic algae and these alterations might have serious consequences on structure and function of aquatic plant communities.
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Affiliation(s)
- Abdallah Oukarroum
- Department of Chemistry, University of Quebec in Montreal, CP 8888, Succ. Centre-Ville, Montreal, Quebec, Canada H3C 3P8
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21
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Shirron N, Yaron S. Active suppression of early immune response in tobacco by the human pathogen Salmonella Typhimurium. PLoS One 2011; 6:e18855. [PMID: 21541320 PMCID: PMC3082535 DOI: 10.1371/journal.pone.0018855] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2010] [Accepted: 03/22/2011] [Indexed: 11/18/2022] Open
Abstract
The persistence of enteric pathogens on plants has been studied extensively, mainly due to the potential hazard of human pathogens such as Salmonella enterica being able to invade and survive in/on plants. Factors involved in the interactions between enteric bacteria and plants have been identified and consequently it was hypothesized that plants may be vectors or alternative hosts for enteric pathogens. To survive, endophytic bacteria have to escape the plant immune systems, which function at different levels through the plant-bacteria interactions. To understand how S. enterica survives endophyticaly we conducted a detailed analysis on its ability to elicit or evade the plant immune response. The models of this study were Nicotiana tabacum plants and cells suspension exposed to S. enterica serovar Typhimurium. The plant immune response was analyzed by looking at tissue damage and by testing oxidative burst and pH changes. It was found that S. Typhimurium did not promote disease symptoms in the contaminated plants. Live S. Typhimurium did not trigger the production of an oxidative burst and pH changes by the plant cells, while heat killed or chloramphenicol treated S. Typhimurium and purified LPS of Salmonella were significant elicitors, indicating that S. Typhimurium actively suppress the plant response. By looking at the plant response to mutants defective in virulence factors we showed that the suppression depends on secreted factors. Deletion of invA reduced the ability of S. Typhimurium to suppress oxidative burst and pH changes, indicating that a functional SPI1 TTSS is required for the suppression. This study demonstrates that plant colonization by S. Typhimurium is indeed an active process. S. Typhimurium utilizes adaptive strategies of altering innate plant perception systems to improve its fitness in the plant habitat. All together these results suggest a complex mechanism for perception of S. Typhimurium by plants.
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Affiliation(s)
- Natali Shirron
- Faculty of Biotechnology and Food Engineering, Technion, Israel Institute of Technology, Haifa, Israel
| | - Sima Yaron
- Faculty of Biotechnology and Food Engineering, Technion, Israel Institute of Technology, Haifa, Israel
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22
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Sintubin L, De Gusseme B, Van der Meeren P, Pycke BFG, Verstraete W, Boon N. The antibacterial activity of biogenic silver and its mode of action. Appl Microbiol Biotechnol 2011; 91:153-62. [DOI: 10.1007/s00253-011-3225-3] [Citation(s) in RCA: 125] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2010] [Revised: 02/11/2011] [Accepted: 03/07/2011] [Indexed: 11/28/2022]
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23
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Saison C, Perreault F, Daigle JC, Fortin C, Claverie J, Morin M, Popovic R. Effect of core-shell copper oxide nanoparticles on cell culture morphology and photosynthesis (photosystem II energy distribution) in the green alga, Chlamydomonas reinhardtii. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2010; 96:109-114. [PMID: 19883948 DOI: 10.1016/j.aquatox.2009.10.002] [Citation(s) in RCA: 122] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2009] [Revised: 09/24/2009] [Accepted: 10/03/2009] [Indexed: 05/28/2023]
Abstract
The effect of core-shell copper oxide nanoparticles with sizes smaller than 100 nm on cellular systems is still not well understood. Documenting these effects is pressing since core-shell copper oxide nanoparticles are currently components of pigments used frequently as antifouling paint protecting boats from crustacean, weed and slime fouling. However, the use of such paints may induce strong deteriorative effects on different aquatic trophic levels that are not the intended targets. Here, the toxic effect of core-shell copper oxide nanoparticles on the green alga, Chlamydomonas reinhardtii was investigated with regards to the change of algal cellular population structure, primary photochemistry of photosystem II and reactive oxygen species formation. Algal cultures were exposed to 0.004, 0.01 and 0.02 g/l of core-shell copper oxide nanoparticles for 6h and a change in algal population structure was observed, while the formation of reactive oxygen species was determined using the 2',7'-dichlorodihydrofluorescein diacetate marker measured by flow cytometry. For the study of the photosystem II primary photochemistry we investigated the change in chlorophyll a rapid rise of fluorescence. We found that core-shell copper oxide nanoparticles induced cellular aggregation processes and had a deteriorative effect on chlorophyll by inducing the photoinhibition of photosystem II. The inhibition of photosynthetic electron transport induced a strong energy dissipation process via non-photochemical pathways. The deterioration of photosynthesis was interpreted as being caused by the formation of reactive oxygen species induced by core-shell copper oxide nanoparticles. However, no formation of reactive oxygen species was observed when C. reinhardtii was exposed to the core without the shell or to the shell only.
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Affiliation(s)
- Cyril Saison
- Department of Chemistry, Université du Québec à Montréal, 2101 Rue Jeanne Mance, Montréal, QC, Canada
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24
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Laxalt AM, Raho N, Have AT, Lamattina L. Nitric Oxide Is Critical for Inducing Phosphatidic Acid Accumulation in Xylanase-elicited Tomato Cells. J Biol Chem 2007; 282:21160-8. [PMID: 17491015 DOI: 10.1074/jbc.m701212200] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Nitric Oxide (NO) is a second messenger related to development and (a)biotic stress responses in plants. We have studied the role of NO in signaling during plant defense responses upon xylanase elicitation. Treatment of tomato cell cultures with the fungal elicitor xylanase resulted in a rapid and dose-dependent NO accumulation. We have demonstrated that NO is required for the production of the lipid second messenger phosphatidic acid (PA) via the activation of the phospholipase C (PLC) and diacylglycerol kinase (DGK) pathway. Defense-related responses downstream of PA were studied. PA and, correspondingly, xylanase were shown to induce reactive oxygen species production. Scavenging of NO or inhibition of either the PLC or the DGK enzyme diminished xylanase-induced reactive oxygen species production. Xylanase-induced PLDbeta1 and PR1 mRNA levels decreased when NO or PA production were compromised. Finally, we have shown that NO and PA are involved in the induction of cell death by xylanase. Treatment with NO scavenger cPTIO, PLC inhibitor U73122, or DGK inhibitor R59022 diminished xylanase-induced cell death. On the basis of biochemical and pharmacological experimental results, we have shown that PLC/DGK-derived PA represents a novel downstream component of NO signaling cascade during plant defense.
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Affiliation(s)
- Ana M Laxalt
- Instituto de Investigaciones Biológicas, Universidad Nacional de Mar del Plata, CC 1245, 7600 Mar del Plata, Argentina.
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25
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Coenye T, Honraet K, Rigole P, Nadal Jimenez P, Nelis HJ. In vitro inhibition of Streptococcus mutans biofilm formation on hydroxyapatite by subinhibitory concentrations of anthraquinones. Antimicrob Agents Chemother 2007; 51:1541-4. [PMID: 17220400 PMCID: PMC1855520 DOI: 10.1128/aac.00999-06] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We report that certain anthraquinones (AQs) reduce Streptococcus mutans biofilm formation on hydroxyapatite at concentrations below the MIC. Although AQs are known to generate reactive oxygen species, the latter do not underlie the observed effect. Our results suggest that AQs inhibit S. mutans biofilm formation by causing membrane perturbation.
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Affiliation(s)
- Tom Coenye
- Laboratorium voor Farmaceutische Microbiologie, Universiteit Gent, Harelbekestraat 72, B-9000 Gent, Belgium.
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26
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van der Merwe JA, Dubery IA. Benzothiadiazole inhibits mitochondrial NADH:ubiquinone oxidoreductase in tobacco. JOURNAL OF PLANT PHYSIOLOGY 2006; 163:877-82. [PMID: 16777535 DOI: 10.1016/j.jplph.2005.08.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2005] [Accepted: 08/11/2005] [Indexed: 05/10/2023]
Abstract
An inducer of acquired disease resistance in plants, benzo (1,2,3) thiadiazole-7-carbothioic acid S-methyl ester, exhibited direct, concentration-dependent inhibition of the NADH:ubiquinone oxidoreductase activity of complex I of the mitochondrial electron transport chain of cultured tobacco cells. The complex I activity was less sensitive to inhibition by salicylic acid, an endogenous activator of acquired disease resistance. Using a dichlorodihydrofluorescein assay, it was found that benzothiadiazole, salicylic acid and the complex I inhibitor rotenone, increased reactive oxygen species production within cells in a concentration-dependent manner. The results indicate that both benzothiadiazole and salicylic acid affect the mitochondria of treated plant cells and result in increased production of reactive oxygen species. The biochemical basis of this response could be related to the inhibition of the NADH:ubiquinone oxidoreductase activity of complex I that results in channelling of electrons via complex II, with concomitant higher levels of superoxide production.
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Affiliation(s)
- Johannes A van der Merwe
- Department of Biochemistry, University of Johannesburg, Kingsway Campus, P.O. Box 524, Auckland Park 2006, South Africa
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27
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Gerber IB, Dubery IA. Protein phosphorylation in Nicotiana tabacum cells in response to perception of lipopolysaccharides from Burkholderia cepacia. PHYTOCHEMISTRY 2004; 65:2957-66. [PMID: 15504430 DOI: 10.1016/j.phytochem.2004.09.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2004] [Revised: 09/06/2004] [Indexed: 05/09/2023]
Abstract
Bacterial LPS have the ability to act as modulators of the innate immune response in plants. Complex and largely unresolved perception systems exist for LPS on the plant cell surfaces that lead to the activation of multiple intracellular defense signaling pathways. The aim of the present study was to investigate the perception mechanism of cultured Nicotiana tabacum cells towards LPS from Burkholderia cepacia (LPS(B.cep.)), with regard to the role of protein phosphorylation during signal perception-related responses to gain a better understanding of the chemosensory perception of LPS elicitor signals in plant cells. In vivo labeling of protein phosphorylation events during signal transduction indicated the rapid phosphorylation of several proteins with the hyperphosphorylation of two proteins of 28 and 2 kDa, respectively. Significant differences and de novo LPS-induced phosphorylation were also observed with two-dimensional analysis. The protein kinase inhibitor, staurosporine, totally inhibited the extracellular alkalinization response induced by LPS(B.cep.), while the oxidative burst was only partially inhibited by staurosporine. Inhibition of protein phosphatase activity by calyculin A intensified the LPS(B.cep.) responses. The results indicate that perception- and signal transduction responses during LPS(B.cep.) elicitation of tobacco cells require a balance between the actions of certain protein kinases and protein phosphatases.
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Affiliation(s)
- Isak B Gerber
- Department of Biochemistry, RAU University, P.O. Box 524, Auckland Park, 2006 Johannesburg, South Africa
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