1
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Gopal R, Tutuncuoglu E, Bakalov V, Wasserloos K, Li H, Lemley D, DeVito LJ, Constantinesco NJ, Reed DS, McHugh KJ, Chinnappan B, Andreas AR, Maloy A, Bain D, Alcorn JF, Pitt BR, Kaynar AM. Zinc deficiency enhances sensitivity to influenza A associated bacterial pneumonia in mice. Physiol Rep 2024; 12:e15902. [PMID: 38163670 PMCID: PMC10758336 DOI: 10.14814/phy2.15902] [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: 06/27/2023] [Revised: 12/13/2023] [Accepted: 12/13/2023] [Indexed: 01/03/2024] Open
Abstract
Although zinc deficiency (secondary to malnutrition) has long been considered an important contributor to morbidity and mortality of infectious disease (e.g. diarrhea disorders), epidemiologic data (including randomized controlled trials with supplemental zinc) for such a role in lower respiratory tract infection are somewhat ambiguous. In the current study, we provide the first preclinical evidence demonstrating that although diet-induced acute zinc deficiency (Zn-D: ~50% decrease) did not worsen infection induced by either influenza A (H1N1) or methicillin-resistant staph aureus (MRSA), Zn-D mice were sensitive to the injurious effects of superinfection of H1N1 with MRSA. Although the mechanism underlying the sensitivity of ZnD mice to combined H1N1/MRSA infection is unclear, it was noteworthy that this combination exacerbated lung injury as shown by lung epithelial injury markers (increased BAL protein) and decreased genes related to epithelial integrity in Zn-D mice (surfactant protein C and secretoglobins family 1A member 1). As bacterial pneumonia accounts for 25%-50% of morbidity and mortality from influenza A infection, zinc deficiency may be an important pathology component of respiratory tract infections.
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Affiliation(s)
- Radha Gopal
- Department of PediatricsUPMC Children's Hospital of PittsburghPittsburghPennsylvaniaUSA
| | - Egemen Tutuncuoglu
- The Clinical Research, Investigation, and Systems Modeling of Acute Illness (CRISMA) CenterUniversity of PittsburghPittsburghPennsylvaniaUSA
- Department of Critical Care MedicineUniversity of PittsburghPittsburghPennsylvaniaUSA
- Present address:
Department of MedicineUniversity of PittsburghPittsburghPennsylvaniaUSA
| | - Veli Bakalov
- The Clinical Research, Investigation, and Systems Modeling of Acute Illness (CRISMA) CenterUniversity of PittsburghPittsburghPennsylvaniaUSA
- Department of Critical Care MedicineUniversity of PittsburghPittsburghPennsylvaniaUSA
- Present address:
Medicine InstituteAllegheny Health NetworkPittsburghPennsylvaniaUSA
| | - Karla Wasserloos
- Department of Environmental and Occupational HealthUniversity of PittsburghPittsburghPennsylvaniaUSA
- Present address:
R.D. 2PortersvillePennsylvaniaUSA
| | - HuiHua Li
- Department of Environmental and Occupational HealthUniversity of PittsburghPittsburghPennsylvaniaUSA
- Present address:
Department of PathologyUniversity of WisconsinMadisonWisconsinUSA
| | - David Lemley
- Department of Environmental and Occupational HealthUniversity of PittsburghPittsburghPennsylvaniaUSA
- Present address:
R.D. 2PortersvillePennsylvaniaUSA
| | - Louis J. DeVito
- Department of PediatricsUPMC Children's Hospital of PittsburghPittsburghPennsylvaniaUSA
| | | | - Douglas S. Reed
- Center for Vaccine ResearchUniversity of PittsburghPittsburghPennsylvaniaUSA
| | - Kevin J. McHugh
- Department of PediatricsUPMC Children's Hospital of PittsburghPittsburghPennsylvaniaUSA
| | - Baskaran Chinnappan
- Department of PediatricsUPMC Children's Hospital of PittsburghPittsburghPennsylvaniaUSA
| | - Alexis R. Andreas
- Department of Critical Care MedicineUniversity of PittsburghPittsburghPennsylvaniaUSA
- Present address:
Department of MedicineUniversity of PittsburghPittsburghPennsylvaniaUSA
| | - Abigail Maloy
- Department of Critical Care MedicineUniversity of PittsburghPittsburghPennsylvaniaUSA
| | - Daniel Bain
- Department of Geology and Planetary ScienceUniversity of PittsburghPittsburghPennsylvaniaUSA
| | - John F. Alcorn
- Department of PediatricsUPMC Children's Hospital of PittsburghPittsburghPennsylvaniaUSA
| | - Bruce R. Pitt
- Department of Environmental and Occupational HealthUniversity of PittsburghPittsburghPennsylvaniaUSA
| | - Ata Murat Kaynar
- The Clinical Research, Investigation, and Systems Modeling of Acute Illness (CRISMA) CenterUniversity of PittsburghPittsburghPennsylvaniaUSA
- Department of Critical Care MedicineUniversity of PittsburghPittsburghPennsylvaniaUSA
- Department of Anesthesiology and Perioperative MedicineUniversity of PittsburghPittsburghPennsylvaniaUSA
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2
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Peng M, Xu Y, Dou B, Yang F, He Q, Liu Z, Gao T, Liu W, Yang K, Guo R, Li C, Tian Y, Zhou D, Bei W, Yuan F. The adcA and lmb Genes Play an Important Role in Drug Resistance and Full Virulence of Streptococcus suis. Microbiol Spectr 2023; 11:e0433722. [PMID: 37212676 PMCID: PMC10269787 DOI: 10.1128/spectrum.04337-22] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Accepted: 02/25/2023] [Indexed: 05/23/2023] Open
Abstract
Streptococcus suis is an recognized zoonotic pathogen of swine and severely threatens human health. Zinc is the second most abundant transition metal in biological systems. Here, we investigated the contribution of zinc to the drug resistance and pathogenesis of S. suis. We knocked out the genes of AdcACB and Lmb, two Zn-binding lipoproteins. Compared to the wild-type strain, we found that the survival rate of this double-mutant strain (ΔadcAΔlmb) was reduced in Zinc-limited medium, but not in Zinc-supplemented medium. Additionally, phenotypic experiments showed that the ΔadcAΔlmb strain displayed impaired adhesion to and invasion of cells, biofilm formation, and tolerance of cell envelope-targeting antibiotics. In a murine infection model, deletion of the adcA and lmb genes in S. suis resulted in a significant decrease in strain virulence, including survival rate, tissue bacterial load, inflammatory cytokine levels, and histopathological damage. These findings show that AdcA and Lmb are important for biofilm formation, drug resistance, and virulence in S. suis. IMPORTANCE Transition metals are important micronutrients for bacterial growth. Zn is necessary for the catalytic activity and structural integrity of various metalloproteins involved in bacterial pathogenic processes. However, how these invaders adapt to host-imposed metal starvation and overcome nutritional immunity remains unknown. Thus, pathogenic bacteria must acquire Zn during infection in order to successfully survive and multiply. The host uses nutritional immunity to limit the uptake of Zn by the invading bacteria. The bacterium uses a set of high-affinity Zn uptake systems to overcome this host metal restriction. Here, we identified two Zn uptake transporters in S. suis, AdcA and Lmb, by bioinformatics analysis and found that an adcA and lmb double-mutant strain could not grow in Zn-deficient medium and was more sensitive to cell envelope-targeting antibiotics. It is worth noting that the Zn uptake system is essential for biofilm formation, drug resistance, and virulence in S. suis. The Zn uptake system is expected to be a target for the development of novel antimicrobial therapies.
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Affiliation(s)
- Mingzheng Peng
- Key Laboratory of Prevention and Control Agents for Animal Bacteriosis (Ministry of Agriculture and Rural Affairs), Hubei Provincial Key Laboratory of Animal Pathogenic Microbiology, Institute of Animal Husbandry and Veterinary, Hubei Academy of Agricultural Sciences, Wuhan, China
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Cooperative Innovation Center for Sustainable Pig Production, Huazhong Agricultural University, Wuhan, China
| | - Yuanyuan Xu
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Cooperative Innovation Center for Sustainable Pig Production, Huazhong Agricultural University, Wuhan, China
| | - Beibei Dou
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Cooperative Innovation Center for Sustainable Pig Production, Huazhong Agricultural University, Wuhan, China
| | - Fengming Yang
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Cooperative Innovation Center for Sustainable Pig Production, Huazhong Agricultural University, Wuhan, China
| | - Qiyun He
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Cooperative Innovation Center for Sustainable Pig Production, Huazhong Agricultural University, Wuhan, China
| | - Zewen Liu
- Key Laboratory of Prevention and Control Agents for Animal Bacteriosis (Ministry of Agriculture and Rural Affairs), Hubei Provincial Key Laboratory of Animal Pathogenic Microbiology, Institute of Animal Husbandry and Veterinary, Hubei Academy of Agricultural Sciences, Wuhan, China
| | - Ting Gao
- Key Laboratory of Prevention and Control Agents for Animal Bacteriosis (Ministry of Agriculture and Rural Affairs), Hubei Provincial Key Laboratory of Animal Pathogenic Microbiology, Institute of Animal Husbandry and Veterinary, Hubei Academy of Agricultural Sciences, Wuhan, China
| | - Wei Liu
- Key Laboratory of Prevention and Control Agents for Animal Bacteriosis (Ministry of Agriculture and Rural Affairs), Hubei Provincial Key Laboratory of Animal Pathogenic Microbiology, Institute of Animal Husbandry and Veterinary, Hubei Academy of Agricultural Sciences, Wuhan, China
| | - Keli Yang
- Key Laboratory of Prevention and Control Agents for Animal Bacteriosis (Ministry of Agriculture and Rural Affairs), Hubei Provincial Key Laboratory of Animal Pathogenic Microbiology, Institute of Animal Husbandry and Veterinary, Hubei Academy of Agricultural Sciences, Wuhan, China
| | - Rui Guo
- Key Laboratory of Prevention and Control Agents for Animal Bacteriosis (Ministry of Agriculture and Rural Affairs), Hubei Provincial Key Laboratory of Animal Pathogenic Microbiology, Institute of Animal Husbandry and Veterinary, Hubei Academy of Agricultural Sciences, Wuhan, China
| | - Chang Li
- Key Laboratory of Prevention and Control Agents for Animal Bacteriosis (Ministry of Agriculture and Rural Affairs), Hubei Provincial Key Laboratory of Animal Pathogenic Microbiology, Institute of Animal Husbandry and Veterinary, Hubei Academy of Agricultural Sciences, Wuhan, China
| | - Yongxiang Tian
- Key Laboratory of Prevention and Control Agents for Animal Bacteriosis (Ministry of Agriculture and Rural Affairs), Hubei Provincial Key Laboratory of Animal Pathogenic Microbiology, Institute of Animal Husbandry and Veterinary, Hubei Academy of Agricultural Sciences, Wuhan, China
| | - Danna Zhou
- Key Laboratory of Prevention and Control Agents for Animal Bacteriosis (Ministry of Agriculture and Rural Affairs), Hubei Provincial Key Laboratory of Animal Pathogenic Microbiology, Institute of Animal Husbandry and Veterinary, Hubei Academy of Agricultural Sciences, Wuhan, China
| | - Weicheng Bei
- Hubei Hongshan Laboratory, Wuhan, China
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Cooperative Innovation Center for Sustainable Pig Production, Huazhong Agricultural University, Wuhan, China
- Guangxi Yangxiang Co. Ltd., Guangxi, China
| | - Fangyan Yuan
- Key Laboratory of Prevention and Control Agents for Animal Bacteriosis (Ministry of Agriculture and Rural Affairs), Hubei Provincial Key Laboratory of Animal Pathogenic Microbiology, Institute of Animal Husbandry and Veterinary, Hubei Academy of Agricultural Sciences, Wuhan, China
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3
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Dysregulation of Streptococcus pneumoniae zinc homeostasis breaks ampicillin resistance in a pneumonia infection model. Cell Rep 2022; 38:110202. [PMID: 35021083 PMCID: PMC9084593 DOI: 10.1016/j.celrep.2021.110202] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Revised: 09/24/2021] [Accepted: 12/13/2021] [Indexed: 11/20/2022] Open
Abstract
Streptococcus pneumoniae is the primary cause of community-acquired bacterial pneumonia with rates of penicillin and multidrug-resistance exceeding 80% and 40%, respectively. The innate immune response generates a variety of antimicrobial agents to control infection, including zinc stress. Here, we characterize the impact of zinc intoxication on S. pneumoniae, observing disruptions in central carbon metabolism, lipid biogenesis, and peptidoglycan biosynthesis. Characterization of the pivotal peptidoglycan biosynthetic enzyme GlmU indicates a sensitivity to zinc inhibition. Disruption of the sole zinc efflux pathway, czcD, renders S. pneumoniae highly susceptible to β-lactam antibiotics. To dysregulate zinc homeostasis in the wild-type strain, we investigated the safe-for-human-use ionophore 5,7-dichloro-2-[(dimethylamino)methyl]quinolin-8-ol (PBT2). PBT2 rendered wild-type S. pneumoniae strains sensitive to a range of antibiotics. Using an invasive ampicillin-resistant strain, we demonstrate in a murine pneumonia infection model the efficacy of PBT2 + ampicillin treatment. These findings present a therapeutic modality to break antibiotic resistance in multidrug-resistant S. pneumoniae.
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4
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Skalny AV, Rink L, Ajsuvakova OP, Aschner M, Gritsenko VA, Alekseenko SI, Svistunov AA, Petrakis D, Spandidos DA, Aaseth J, Tsatsakis A, Tinkov AA. Zinc and respiratory tract infections: Perspectives for COVID‑19 (Review). Int J Mol Med 2020; 46:17-26. [PMID: 32319538 PMCID: PMC7255455 DOI: 10.3892/ijmm.2020.4575] [Citation(s) in RCA: 211] [Impact Index Per Article: 52.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Accepted: 04/13/2020] [Indexed: 01/08/2023] Open
Abstract
In view of the emerging COVID‑19 pandemic caused by SARS‑CoV‑2 virus, the search for potential protective and therapeutic antiviral strategies is of particular and urgent interest. Zinc is known to modulate antiviral and antibacterial immunity and regulate inflammatory response. Despite the lack of clinical data, certain indications suggest that modulation of zinc status may be beneficial in COVID‑19. In vitro experiments demonstrate that Zn2+ possesses antiviral activity through inhibition of SARS‑CoV RNA polymerase. This effect may underlie therapeutic efficiency of chloroquine known to act as zinc ionophore. Indirect evidence also indicates that Zn2+ may decrease the activity of angiotensin‑converting enzyme 2 (ACE2), known to be the receptor for SARS‑CoV‑2. Improved antiviral immunity by zinc may also occur through up‑regulation of interferon α production and increasing its antiviral activity. Zinc possesses anti‑inflammatory activity by inhibiting NF‑κB signaling and modulation of regulatory T‑cell functions that may limit the cytokine storm in COVID‑19. Improved Zn status may also reduce the risk of bacterial co‑infection by improving mucociliary clearance and barrier function of the respiratory epithelium, as well as direct antibacterial effects against S. pneumoniae. Zinc status is also tightly associated with risk factors for severe COVID‑19 including ageing, immune deficiency, obesity, diabetes, and atherosclerosis, since these are known risk groups for zinc deficiency. Therefore, Zn may possess protective effect as preventive and adjuvant therapy of COVID‑19 through reducing inflammation, improvement of mucociliary clearance, prevention of ventilator‑induced lung injury, modulation of antiviral and antibacterial immunity. However, further clinical and experimental studies are required.
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Affiliation(s)
- Anatoly V. Skalny
- I.M. Sechenov First Moscow State Medical University (Sechenov University), 119146 Moscow
- Yaroslavl State University, 150003 Yaroslavl, Russia
| | - Lothar Rink
- Institute of Immunology, Medical Faculty, RWTH Aachen University, D-52062 Aachen, Germany
| | - Olga P. Ajsuvakova
- Yaroslavl State University, 150003 Yaroslavl, Russia
- Federal Research Centre of Biological Systems and Agro-technologies of the Russian Academy of Sciences, 460000 Orenburg, Russia
| | - Michael Aschner
- I.M. Sechenov First Moscow State Medical University (Sechenov University), 119146 Moscow
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Viktor A. Gritsenko
- Institute of Cellular and Intracellular Symbiosis, Russian Academy of Sciences, 460000 Orenburg
| | - Svetlana I. Alekseenko
- I.I. Mechnikov North-Western State Medical University, 191015 St. Petersburg
- K.A. Rauhfus Children's City Multidisciplinary Clinical Center for High Medical Technologies, 191000 St. Petersburg, Russia
| | - Andrey A. Svistunov
- I.M. Sechenov First Moscow State Medical University (Sechenov University), 119146 Moscow
| | | | - Demetrios A. Spandidos
- Laboratory of Clinical Virology, Medical School, University of Crete, 71409 Heraklion, Greece
| | - Jan Aaseth
- I.M. Sechenov First Moscow State Medical University (Sechenov University), 119146 Moscow
- Research Department, Innlandet Hospital Trust, 3159894 Brumunddal, Norway
| | - Aristidis Tsatsakis
- I.M. Sechenov First Moscow State Medical University (Sechenov University), 119146 Moscow
- Center of Toxicology Science and Research
| | - Alexey A. Tinkov
- I.M. Sechenov First Moscow State Medical University (Sechenov University), 119146 Moscow
- Yaroslavl State University, 150003 Yaroslavl, Russia
- Institute of Cellular and Intracellular Symbiosis, Russian Academy of Sciences, 460000 Orenburg
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5
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Eijkelkamp BA, Morey JR, Neville SL, Tan A, Pederick VG, Cole N, Singh PP, Ong CLY, Gonzalez de Vega R, Clases D, Cunningham BA, Hughes CE, Comerford I, Brazel EB, Whittall JJ, Plumptre CD, McColl SR, Paton JC, McEwan AG, Doble PA, McDevitt CA. Dietary zinc and the control of Streptococcus pneumoniae infection. PLoS Pathog 2019; 15:e1007957. [PMID: 31437249 PMCID: PMC6705770 DOI: 10.1371/journal.ppat.1007957] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Accepted: 07/03/2019] [Indexed: 12/21/2022] Open
Abstract
Human zinc deficiency increases susceptibility to bacterial infection. Although zinc supplementation therapies can reduce the impact of disease, the molecular basis for protection remains unclear. Streptococcus pneumoniae is a major cause of bacterial pneumonia, which is prevalent in regions of zinc deficiency. We report that dietary zinc levels dictate the outcome of S. pneumoniae infection in a murine model. Dietary zinc restriction impacts murine tissue zinc levels with distribution post-infection altered, and S. pneumoniae virulence and infection enhanced. Although the activation and infiltration of murine phagocytic cells was not affected by zinc restriction, their efficacy of bacterial control was compromised. S. pneumoniae was shown to be highly sensitive to zinc intoxication, with this process impaired in zinc restricted mice and isolated phagocytic cells. Collectively, these data show how dietary zinc deficiency increases sensitivity to S. pneumoniae infection while revealing a role for zinc as a component of host antimicrobial defences. Zinc deficiency affects one-third of the world’s population and is associated with an increased susceptibility to bacterial infection. Despite this, the molecular basis for how zinc deficiency compromises host control of infection remains to be understood. We show that dietary zinc deficiency impacts host tissue zinc abundances and its mobilization during infection by the major respiratory pathogen Streptococcus pneumoniae. Zinc acts as a direct antimicrobial against the pathogen, mobilized by phagocytic cells as a component of the innate immune response. Although immune activation and infiltration of phagocytic cells is unaffected by host zinc status, the lack of antimicrobial zinc compromises bacterial control in zinc deficient hosts. These findings highlight the importance of zinc sufficiency in resisting bacterial infection.
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Affiliation(s)
- Bart A Eijkelkamp
- Research Centre for Infectious Diseases, Department of Molecular and Biomedical Science, School of Biological Sciences, The University of Adelaide, Adelaide, Australia
| | - Jacqueline R Morey
- Department of Molecular and Biomedical Science, School of Biological Sciences, The University of Adelaide, Adelaide, Australia
| | - Stephanie L Neville
- Department of Molecular and Biomedical Science, School of Biological Sciences, The University of Adelaide, Adelaide, Australia.,Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Aimee Tan
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Victoria G Pederick
- Department of Molecular and Biomedical Science, School of Biological Sciences, The University of Adelaide, Adelaide, Australia
| | - Nerida Cole
- The Atomic Medicine Initiative, University of Technology, Broadway, Sydney, New South Wales, Australia.,ARC Training Centre in Biodevices, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria, Australia
| | - Prashina P Singh
- The Atomic Medicine Initiative, University of Technology, Broadway, Sydney, New South Wales, Australia
| | - Cheryl-Lynn Y Ong
- Australian Infectious Diseases Research Centre, School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, Queensland, Australia
| | - Raquel Gonzalez de Vega
- The Atomic Medicine Initiative, University of Technology, Broadway, Sydney, New South Wales, Australia
| | - David Clases
- The Atomic Medicine Initiative, University of Technology, Broadway, Sydney, New South Wales, Australia
| | - Bliss A Cunningham
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Catherine E Hughes
- Research Centre for Infectious Diseases, Department of Molecular and Biomedical Science, School of Biological Sciences, The University of Adelaide, Adelaide, Australia
| | - Iain Comerford
- Department of Molecular and Biomedical Science, School of Biological Sciences, The University of Adelaide, Adelaide, Australia
| | - Erin B Brazel
- Research Centre for Infectious Diseases, Department of Molecular and Biomedical Science, School of Biological Sciences, The University of Adelaide, Adelaide, Australia
| | - Jonathan J Whittall
- Department of Molecular and Biomedical Science, School of Biological Sciences, The University of Adelaide, Adelaide, Australia
| | - Charles D Plumptre
- Research Centre for Infectious Diseases, Department of Molecular and Biomedical Science, School of Biological Sciences, The University of Adelaide, Adelaide, Australia
| | - Shaun R McColl
- Department of Molecular and Biomedical Science, School of Biological Sciences, The University of Adelaide, Adelaide, Australia
| | - James C Paton
- Research Centre for Infectious Diseases, Department of Molecular and Biomedical Science, School of Biological Sciences, The University of Adelaide, Adelaide, Australia
| | - Alastair G McEwan
- Australian Infectious Diseases Research Centre, School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, Queensland, Australia
| | - Philip A Doble
- The Atomic Medicine Initiative, University of Technology, Broadway, Sydney, New South Wales, Australia
| | - Christopher A McDevitt
- Department of Molecular and Biomedical Science, School of Biological Sciences, The University of Adelaide, Adelaide, Australia.,Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
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6
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Smith AD, Panickar KS, Urban JF, Dawson HD. Impact of Micronutrients on the Immune Response of Animals. Annu Rev Anim Biosci 2019; 6:227-254. [PMID: 29447473 DOI: 10.1146/annurev-animal-022516-022914] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Vitamins and minerals (micronutrients) play an important role in regulating and shaping an immune response. Deficiencies generally result in inadequate or dysregulated cellular activity and cytokine expression, thereby affecting the immune response. Decreased levels of natural killer, granulocyte, and phagocytic cell activity and T and B cell proliferation and trafficking are associated with inadequate levels of micronutrients, as well as increased susceptibility to various adverse health conditions, including inflammatory disorders, infection, and altered vaccine efficacy. In addition, most studies of micronutrient modulation of immune responses have been done in rodents and humans, thus limiting application to the health and well-being of livestock and companion animals. This exploratory review elucidates the role of vitamins and minerals on immune function and inflammatory responses in animals (pigs, dogs, cats, horses, goats, sheep, and cattle), with reference to rodents and humans.
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Affiliation(s)
- Allen D Smith
- United States Department of Agriculture, Agricultural Research Service, Beltsville Human Nutrition Research Center, Diet, Genomics & Immunology Laboratory, Beltsville, Maryland 20705-2350, USA;
| | - Kiran S Panickar
- Science & Technology Center, Hills Pet Nutrition Center, Topeka, Kansas 66617, USA
| | - Joseph F Urban
- United States Department of Agriculture, Agricultural Research Service, Beltsville Human Nutrition Research Center, Diet, Genomics & Immunology Laboratory, Beltsville, Maryland 20705-2350, USA;
| | - Harry D Dawson
- United States Department of Agriculture, Agricultural Research Service, Beltsville Human Nutrition Research Center, Diet, Genomics & Immunology Laboratory, Beltsville, Maryland 20705-2350, USA;
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7
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Mechanistic insights into the protective impact of zinc on sepsis. Cytokine Growth Factor Rev 2017; 39:92-101. [PMID: 29279185 DOI: 10.1016/j.cytogfr.2017.12.002] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Accepted: 12/19/2017] [Indexed: 12/11/2022]
Abstract
Sepsis, a systemic inflammation as a response to a bacterial infection, is a huge unmet medical need. Data accumulated over the last decade suggest that the nutritional status of patients as well as composition of their gut microbiome, are strongly linked with the risk to develop sepsis, the severity of the disease and prognosis. In particular, the essential micronutrient zinc is essential in the resistance against sepsis and has shown to be protective in animal models as well as in human patients. The potential mechanisms by which zinc protects in sepsis are discussed in this review paper: we will focus on the inflammatory response, chemotaxis, phagocytosis, immune response, oxidative stress and modulation of the microbiome. A full understanding of the mechanism of action of zinc may open new preventive and therapeutic interventions in sepsis.
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8
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Phillips BE, Geletzke AK, Smith PB, Podany AB, Chacon A, Kelleher SL, Patterson AD, Soybel DI. Impaired recovery from peritoneal inflammation in a mouse model of mild dietary zinc restriction. Mol Nutr Food Res 2016; 60:672-81. [DOI: 10.1002/mnfr.201500688] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Revised: 10/30/2015] [Accepted: 10/31/2015] [Indexed: 12/31/2022]
Affiliation(s)
| | | | - Philip B. Smith
- Departments of Veterinary and Biomedical Sciences; University Park PA USA
- The Huck Institutes of the Life Sciences; University Park PA USA
| | | | | | - Shannon L. Kelleher
- Departments of Surgery; Hershey PA USA
- Cellular and Molecular Physiology; Hershey PA USA
| | - Andrew D. Patterson
- Departments of Veterinary and Biomedical Sciences; University Park PA USA
- Molecular Toxicology; University Park PA USA
| | - David I. Soybel
- Departments of Surgery; Hershey PA USA
- Cellular and Molecular Physiology; Hershey PA USA
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9
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Brown LR, Gunnell SM, Cassella AN, Keller LE, Scherkenbach LA, Mann B, Brown MW, Hill R, Fitzkee NC, Rosch JW, Tuomanen EI, Thornton JA. AdcAII of Streptococcus pneumoniae Affects Pneumococcal Invasiveness. PLoS One 2016; 11:e0146785. [PMID: 26752283 PMCID: PMC4709005 DOI: 10.1371/journal.pone.0146785] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Accepted: 12/22/2015] [Indexed: 11/18/2022] Open
Abstract
Across bacterial species, metal binding proteins can serve functions in pathogenesis in addition to regulating metal homeostasis. We have compared and contrasted the activities of zinc (Zn2+)-binding lipoproteins AdcA and AdcAII in the Streptococcus pneumoniae TIGR4 background. Exposure to Zn2+-limiting conditions resulted in delayed growth in a strain lacking AdcAII (ΔAdcAII) when compared to wild type bacteria or a mutant lacking AdcA (ΔAdcA). AdcAII failed to interact with the extracellular matrix protein laminin despite homology to laminin-binding proteins of related streptococci. Deletion of AdcA or AdcAII led to significantly increased invasion of A549 human lung epithelial cells and a trend toward increased invasion in vivo. Loss of AdcAII, but not AdcA, was shown to negatively impact early colonization of the nasopharynx. Our findings suggest that expression of AdcAII affects invasiveness of S. pneumoniae in response to available Zn2+ concentrations.
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Affiliation(s)
- Lindsey R. Brown
- Department of Biological Sciences, Mississippi State University, Mississippi State, MS, 39762, United States of America
| | - Steven M. Gunnell
- Department of Biological Sciences, Mississippi State University, Mississippi State, MS, 39762, United States of America
| | - Adam N. Cassella
- Department of Biological Sciences, Mississippi State University, Mississippi State, MS, 39762, United States of America
| | - Lance E. Keller
- Department of Microbiology, University of Mississippi Medical Center, Jackson, MS, 39216, United States of America
| | - Lisa A. Scherkenbach
- Department of Infectious Diseases, St. Jude Children’s Research Hospital, Memphis, TN, 38105, United States of America
| | - Beth Mann
- Department of Infectious Diseases, St. Jude Children’s Research Hospital, Memphis, TN, 38105, United States of America
| | - Matthew W. Brown
- Department of Biological Sciences, Mississippi State University, Mississippi State, MS, 39762, United States of America
| | - Rebecca Hill
- Department of Chemistry, Mississippi State University, Mississippi State, MS, 39762, United States of America
| | - Nicholas C. Fitzkee
- Department of Chemistry, Mississippi State University, Mississippi State, MS, 39762, United States of America
| | - Jason W. Rosch
- Department of Infectious Diseases, St. Jude Children’s Research Hospital, Memphis, TN, 38105, United States of America
| | - Elaine I. Tuomanen
- Department of Infectious Diseases, St. Jude Children’s Research Hospital, Memphis, TN, 38105, United States of America
| | - Justin A. Thornton
- Department of Biological Sciences, Mississippi State University, Mississippi State, MS, 39762, United States of America
- * E-mail:
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10
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Braga CBM, Ferreira de Miranda Santos IK, Palmeira P, Peria FM, de Figueiredo Ribeiro SM, Martinez EZ, da Rocha JJR, Carvalho da Cunha SFD. Effect of Zinc Supplementation on Serological Response to Vaccination AgainstStreptococcus Pneumoniaein Patients Undergoing Chemotherapy for Colorectal Cancer. Nutr Cancer 2015; 67:926-32. [DOI: 10.1080/01635581.2015.1053497] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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11
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Eijkelkamp BA, Morey JR, Ween MP, Ong CLY, McEwan AG, Paton JC, McDevitt CA. Extracellular zinc competitively inhibits manganese uptake and compromises oxidative stress management in Streptococcus pneumoniae. PLoS One 2014; 9:e89427. [PMID: 24558498 PMCID: PMC3928430 DOI: 10.1371/journal.pone.0089427] [Citation(s) in RCA: 93] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Accepted: 01/22/2014] [Indexed: 12/21/2022] Open
Abstract
Streptococcus pneumoniae requires manganese for colonization of the human host, but the underlying molecular basis for this requirement has not been elucidated. Recently, it was shown that zinc could compromise manganese uptake and that zinc levels increased during infection by S. pneumoniae in all the niches that it colonized. Here we show, by quantitative means, that extracellular zinc acts in a dose dependent manner to competitively inhibit manganese uptake by S. pneumoniae, with an EC50 of 30.2 µM for zinc in cation-defined media. By exploiting the ability to directly manipulate S. pneumoniae accumulation of manganese, we analyzed the connection between manganese and superoxide dismutase (SodA), a primary source of protection for S. pneumoniae against oxidative stress. We show that manganese starvation led to a decrease in sodA transcription indicating that expression of sodA was regulated through an unknown manganese responsive pathway. Intriguingly, examination of recombinant SodA revealed that the enzyme was potentially a cambialistic superoxide dismutase with an iron/manganese cofactor. SodA was also shown to provide the majority of protection against oxidative stress as a S. pneumoniae ΔsodA mutant strain was found to be hypersensitive to oxidative stress, despite having wild-type manganese levels, indicating that the metal ion alone was not sufficiently protective. Collectively, these results provide a quantitative assessment of the competitive effect of zinc upon manganese uptake and provide a molecular basis for how extracellular zinc exerts a ‘toxic’ effect on bacterial pathogens, such as S. pneumoniae.
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Affiliation(s)
- Bart A. Eijkelkamp
- Research Centre for Infectious Diseases, School of Molecular and Biomedical Science, University of Adelaide, South Australia, Australia
| | - Jacqueline R. Morey
- Research Centre for Infectious Diseases, School of Molecular and Biomedical Science, University of Adelaide, South Australia, Australia
| | - Miranda P. Ween
- Research Centre for Infectious Diseases, School of Molecular and Biomedical Science, University of Adelaide, South Australia, Australia
| | - Cheryl-lynn Y. Ong
- School of Chemistry and Molecular Biosciences, Australian Infectious Diseases Research Centre and Institute for Molecular Bioscience, University of Queensland, Brisbane, Australia
| | - Alastair G. McEwan
- School of Chemistry and Molecular Biosciences, Australian Infectious Diseases Research Centre and Institute for Molecular Bioscience, University of Queensland, Brisbane, Australia
| | - James C. Paton
- Research Centre for Infectious Diseases, School of Molecular and Biomedical Science, University of Adelaide, South Australia, Australia
| | - Christopher A. McDevitt
- Research Centre for Infectious Diseases, School of Molecular and Biomedical Science, University of Adelaide, South Australia, Australia
- * E-mail:
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Shafeeq S, Kuipers OP, Kloosterman TG. The role of zinc in the interplay between pathogenic streptococci and their hosts. Mol Microbiol 2013; 88:1047-57. [DOI: 10.1111/mmi.12256] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/06/2013] [Indexed: 12/26/2022]
Affiliation(s)
- Sulman Shafeeq
- Department of Molecular Genetics; Groningen Biomolecular Sciences and Biotechnology Institute; University of Groningen; Nijenborgh 7; 9747 AG; Groningen; the Netherlands
| | - Oscar P. Kuipers
- Department of Molecular Genetics; Groningen Biomolecular Sciences and Biotechnology Institute; University of Groningen; Nijenborgh 7; 9747 AG; Groningen; the Netherlands
| | - Tomas G. Kloosterman
- Department of Molecular Genetics; Groningen Biomolecular Sciences and Biotechnology Institute; University of Groningen; Nijenborgh 7; 9747 AG; Groningen; the Netherlands
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Development of a fourfold multiplexed opsonophagocytosis assay for pneumococcal antibodies against additional serotypes and discovery of serological subtypes in Streptococcus pneumoniae serotype 20. CLINICAL AND VACCINE IMMUNOLOGY : CVI 2012; 19:835-41. [PMID: 22518015 DOI: 10.1128/cvi.00086-12] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Opsonophagocytic killing assays (OPAs) are important in vitro surrogate markers of protection in vaccine studies of Streptococcus pneumoniae. We have previously reported the development of a 4-fold multiplexed OPA (MOPA) for the 13 serotypes in Prevnar 13. Because new conjugate vaccines with increased valence are being developed, we developed 4-fold MOPAs for an additional 13 serotypes: serotypes 6C and 6D, plus the 11 serotypes contained in Pneumovax but not in Prevnar 13. A high level of nonspecific killing (NSK) was observed for three serotypes (10A, 15B, and 33F) in multiple batches of baby rabbit complement. The NSK could be reduced by preadsorbing the complement with encapsulated, as well as unencapsulated, pneumococcal strains. The MOPA results compared well with the results of single-serotype OPA for all serotypes except for serotype 3. For serotype 3, the results obtained from the MOPA format were ~40% higher than those of the single-serotype format. Interassay precision of MOPA was determined with 5 serum samples, and the coefficient of variation was generally <30% for all serotypes. MOPA was also specific for all serotypes except for serotype 20; i.e., free homologous polysaccharide (PS), but not unrelated PS, could completely and efficiently inhibit opsonization. However, serotype 20 PS from ATCC could efficiently inhibit opsonization of one serotype 20 target strain but not three other type 20 target strains even at a high (>80 mg/liter) PS concentration. This suggests the presence of serologic heterogeneity among serotype 20 strains.
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Srinivasan MG, Ndeezi G, Mboijana CK, Kiguli S, Bimenya GS, Nankabirwa V, Tumwine JK. Zinc adjunct therapy reduces case fatality in severe childhood pneumonia: a randomized double blind placebo-controlled trial. BMC Med 2012; 10:14. [PMID: 22316073 PMCID: PMC3296597 DOI: 10.1186/1741-7015-10-14] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2012] [Accepted: 02/08/2012] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND Pneumonia is a leading cause of children's deaths in developing countries and hinders achievement of the fourth Millennium Development Goal. This goal aims to reduce the under-five mortality rate, by two thirds, between 1990 and 2015.Few studies have examined the impact of zinc adjunct therapy on the outcome of childhood pneumonia. We determined the effect of zinc as adjunct therapy on time to normalization of respiratory rate, temperature and oxygen saturation. We also studied the effect of zinc adjunct therapy on case fatality of severe childhood pneumonia (as a secondary outcome) in Mulago Hospital, Uganda. METHODS In this double blind, randomized, placebo-controlled clinical trial, 352 children aged 6 to 59 months, with severe pneumonia were randomized to zinc (20 mg for children ≥ 12 months, and 10 mg for those < 12 months) or a placebo once daily for seven days, in addition to standard antibiotics for severe pneumonia. Children were assessed every six hours. Oxygen saturation was normal if it was above 92% (breathing room air) for more than 15 minutes. The respiratory rate was normal if it was consistently (more than 24 hours) below 50 breaths per minute in infants and 40 breaths per minute in children above 12 months of age. Temperature was normal if consistently below 37.5°C. The difference in case fatality was expressed by the risk ratio between the two groups. RESULTS Time to normalization of the respiratory rate, temperature and oxygen saturation was not significantly different between the two arms.Case fatality was 7/176 (4.0%) in the zinc group and 21/176 (11.9%) in the placebo group: Relative Risk 0.33 (95% CI 0.15 to 0.76). Relative Risk Reduction was 0.67 (95% CI 0.24 to 0.85), while the number needed to treat was 13. Among HIV infected children, case fatality was higher in the placebo (7/27) than in the zinc (0/28) group; RR 0.1 (95% CI 0.0, 1.0).Among 127 HIV uninfected children receiving the placebo, case fatality was 7/127 (5.5%); versus 5/129 (3.9%) among HIV uninfected group receiving zinc: RR 0.7 (95% CI 0.2, 2.2). The excess risk of death attributable to the placebo arm (Absolute Risk Reduction or ARR) was 8/100 (95% CI: 2/100, 14/100) children. This excess risk was substantially greater among HIV positive children than in HIV negative children (ARR: 26 (95% CI: 9, 42) per 100 versus 2 (95% CI: -4, 7) per 100); P-value for homogeneity of risk differences = 0.006. CONCLUSION Zinc adjunct therapy for severe pneumonia had no significant effect on time to normalization of the respiratory rate, temperature and oxygen saturation. However, zinc supplementation in these children significantly decreased case fatality.The difference in case fatality attributable to the protective effect of zinc therapy was greater among HIV infected than HIV uninfected children. Given these results, zinc could be considered for use as adjunct therapy for severe pneumonia, especially among Highly Active Antiretroviral Therapynaïve HIV infected children in our environment. CLINICAL TRIALS REGISTRATION NUMBER clinicaltrials.gov NCT00373100.
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Affiliation(s)
- Maheswari G Srinivasan
- Department of Paediatrics and Child Health, School of Medicine, Makerere University, College of Health Sciences, Kampala, Uganda
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Chandyo RK, Shrestha PS, Valentiner-Branth P, Mathisen M, Basnet S, Ulak M, Adhikari RK, Sommerfelt H, Strand TA. Two weeks of zinc administration to Nepalese children with pneumonia does not reduce the incidence of pneumonia or diarrhea during the next six months. J Nutr 2010; 140:1677-82. [PMID: 20631326 DOI: 10.3945/jn.109.117978] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Diarrhea and pneumonia are the 2 main causes of death in children under 5 y of age. Short courses of zinc administration are now recommended for treatment of childhood diarrhea and some studies have also shown its beneficial effect on treatment of pneumonia. The objective of our study was to assess the efficacy of zinc administration (10 mg/d for children 2-11 mo and 20 mg/d for >or= 12 mo of age) for 14 d on preventing diarrheal and respiratory illnesses for 6 mo of follow-up. This was a randomized, double-blind, placebo-controlled trial in children 2-35 mo of age with community-acquired pneumonia. The number of illness episodes and time until the first episode of various illnesses were compared between the 2 study groups. After 14 d of zinc supplementation, plasma zinc was significantly higher in the group receiving zinc. However, this difference was not detectable at 1 and 2.5 mo after the end of zinc administration. Of 2628 enrolled cases, a total of 2599 (99%) were available for assessment after the completion of zinc supplementation. The number of hospital visits and the median number of days until the first episode of pneumonia, diarrhea, and dysentery was similar in the 2 groups. The hazard ratios (95% CI) were 1.02 (0.92, 1.14) for nonsevere pneumonia, 1.11 (0.72, 1.73) for severe pneumonia, 1.07 (0.91, 1.26) for diarrhea, and 0.96 (0.69, 1.34) for dysentery. A short course of zinc supplementation given during an episode of pneumonia did not prevent diarrheal or respiratory illness over the next 6 mo.
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Affiliation(s)
- Ram K Chandyo
- Centre for International Health, University of Bergen, Bergen, Norway
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16
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Molin Y, Frisk P, Hjelm E, Blomberg J, Friman G, Ilbäck NG. Arsenic trioxide influences viral replication in target organs of coxsackievirus B3-infected mice. Microbes Infect 2010; 12:1027-34. [PMID: 20638482 DOI: 10.1016/j.micinf.2010.07.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2010] [Revised: 06/23/2010] [Accepted: 07/06/2010] [Indexed: 10/19/2022]
Abstract
New antiviral agents are urgently needed. Based on in vitro studies, arsenic trioxide (As₂O₃) seems to affect viral replication, although this has been studied only marginally in vivo. In this study the replication of coxsackievirus B3 (CVB3) was studied in Balb/c mice administered 1 mg As₂O₃/kg bw once daily during 7 days of infection and in Vero cells exposed for 3 or 5 days to 0.4, 2 or 4 μM As₂O₃. Viral RNA was measured by reverse transcription PCR (RT-PCR) (in vitro and in vivo) and arsenic concentration was measured by inductively coupled plasma-mass spectrometry (ICP-MS) (in vivo). In vivo, As₂O₃ decreased viral RNA in the brain on days 3 (by 81%; p < 0.05) and 7 (by 97%; p < 0.01) and in the pancreas on day 7 (by 75%; p < 0.05), two of the target organs of this infection. The results were confirmed in vitro, where As₂O₃ dose-dependently reduced viral RNA, with the effect being more pronounced in the surrounding culture medium than inside the infected cells, indicating an impaired virion release. Thus, As₂O₃ reduced CVB3 replication both in vitro and in vivo, indicating that As₂O₃ is a viable option in the pursuit of new therapeutic agents against viral infections.
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Affiliation(s)
- Ylva Molin
- Infectious Diseases, Department of Medical Sciences, Uppsala University Hospital, S-751 85 Uppsala, Sweden.
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17
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Zinc deficiency increases organ damage and mortality in a murine model of polymicrobial sepsis. Crit Care Med 2009; 37:1380-8. [PMID: 19242332 DOI: 10.1097/ccm.0b013e31819cefe4] [Citation(s) in RCA: 106] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
OBJECTIVE Zinc deficiency is common among populations at high risk for sepsis mortality, including elderly, alcoholic, and hospitalized patients. Zinc deficiency causes exaggerated inflammatory responses to endotoxin but has not been evaluated during bacterial sepsis. We hypothesized that subacute zinc deficiency would amplify immune responses and oxidant stress during bacterial sepsis {lsqb;i.e., cecal ligation and puncture (CLP){rsqb; resulting in increased mortality and that acute nutritional repletion of zinc would be beneficial. DESIGN Prospective, randomized, controlled animal study. SETTING University medical center research laboratory. SUBJECTS Adult male C57BL/6 mice. INTERVENTIONS Ten-week-old, male, C57BL/6 mice were randomized into three dietary groups: 1) control diet, 2) zinc-deficient diet for 3 weeks, and 3) zinc-deficient diet for 3 weeks followed by oral zinc supplementation for 3 days (n = 35 per diet). Mice were then assigned to receive either CLP or sham operation (n = 15 each per diet). CLP and sham-operated treatment groups were further assigned to a 7-day survival study (n = 10 per treatment per diet) or were evaluated at 24 hours (n = 5 per treatment per diet) for signs of vital organ damage. MEASUREMENTS AND MAIN RESULTS Sepsis mortality was significantly increased with zinc deficiency (90% vs. 30% on control diet). Zinc-deficient animals subject to CLP had higher plasma cytokines, more severe organ injury, including increased oxidative tissue damage and cell death, particularly in the lungs and spleen. None of the sham-operated animals died or developed signs of organ damage. Zinc supplementation normalized the inflammatory response, greatly diminished tissue damage, and significantly reduced mortality. CONCLUSIONS Subacute zinc deficiency significantly increases systemic inflammation, organ damage, and mortality in a murine polymicrobial sepsis model. Short-term zinc repletion provides significant, but incomplete protection despite normalization of inflammatory and organ damage indices.
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Ilbäck NG, Frisk P, Friman G. Effects of xenobiotics and nutrients on host resistance studied in experimental human infections adapted to rodents. J Pharmacol Toxicol Methods 2008; 58:179-88. [DOI: 10.1016/j.vascn.2008.05.132] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2008] [Accepted: 05/12/2008] [Indexed: 01/05/2023]
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Hembre BSH, Briles DE, Grewal HMS, Strand TA. Effect of high dose oral zinc in mice with severe infection with Streptococcus pneumoniae. ACTA ACUST UNITED AC 2008; 40:363-7. [PMID: 17963160 DOI: 10.1080/00365540701716833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Zinc is important for normal function of the immune system and inflammation increases the demand for zinc. We hypothesized that high doses of zinc given during acute pneumococcal illness would alter the severity of infection. 24 six-week-old BALB/c mice were anaesthetized and infected intranasally with Streptococcus pneumoniae. Zinc intake was controlled by administering zinc through an intragastric tube. One group was given normal doses (5 microg/d) and the other group high doses of zinc (225 microg/d). We counted the number of bacteria from venous blood at 24 and 48 h, and from heart puncture and nasal wash at 72 h after intranasal challenge. Mice given excess zinc had 2.65 micromol/l, i.e. 25% higher (p= 0.05) mean plasma zinc concentration compared to those given normal amounts. 75% of mice in both groups developed pneumococcal bacteraemia. There were no differences in the numbers of S. pneumoniae colony forming units (CFUs) in blood or nasal wash between the groups. Thus, high doses of zinc did not alter the severity of systemic pneumococcal infection in mice.
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Affiliation(s)
- Berit S H Hembre
- Department of Medicine, Lovisenberg Diakonale Sykehus, Oslo, Norway.
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20
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Opposite effects of Mn2+ and Zn2+ on PsaR-mediated expression of the virulence genes pcpA, prtA, and psaBCA of Streptococcus pneumoniae. J Bacteriol 2008; 190:5382-93. [PMID: 18515418 DOI: 10.1128/jb.00307-08] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Homeostasis of Zn(2+) and Mn(2+) is important for the physiology and virulence of the human pathogen Streptococcus pneumoniae. Here, transcriptome analysis was used to determine the response of S. pneumoniae D39 to a high concentration of Zn(2+). Interestingly, virulence genes encoding the choline binding protein PcpA, the extracellular serine protease PrtA, and the Mn(2+) uptake system PsaBC(A) were strongly upregulated in the presence of Zn(2+). Using random mutagenesis, a previously described Mn(2+)-responsive transcriptional repressor, PsaR, was found to mediate the observed Zn(2+)-dependent derepression. In addition, PsaR is also responsible for the Mn(2+)-dependent repression of these genes. Subsequently, we investigated how these opposite effects are mediated by the same regulator. In vitro binding of purified PsaR to the prtA, pcpA, and psaB promoters was stimulated by Mn(2+), whereas Zn(2+) destroyed the interaction of PsaR with its target promoters. Mutational analysis of the pcpA promoter demonstrated the presence of a PsaR operator that mediates the transcriptional effects. In conclusion, PsaR is responsible for the counteracting effects of Mn(2+) and Zn(2+) on the expression of several virulence genes in S. pneumoniae, suggesting that the ratio of these metal ions exerts an important influence on pneumococcal pathogenesis.
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Amelioratory effects of zinc supplementation on Salmonella-induced hepatic damage in the murine model. Dig Dis Sci 2008; 53:1063-70. [PMID: 17934836 DOI: 10.1007/s10620-007-9958-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2007] [Accepted: 08/01/2007] [Indexed: 12/09/2022]
Abstract
Zinc (Zn) has been reported to influence the susceptibility of the host to a diverse range of infectious pathogens, including viruses, bacteria, fungi and protozoa. We report here an evaluation of the effects of Zn supplementation on Salmonella enterica serovar Typhimurium (S. typhimurium)-induced hepatic injury in the murine model. Zinc levels in the plasma and liver tissues were measured by atomic absorption spectroscopy. The effect of Zn supplementation was evaluated by assessing the bacterial load and levels of lipid peroxidation (LPO), antioxidants and monokines present in the hepatic tissue as well as by histopathological studies. Zinc supplementation reduced the bacterial load in the liver and reversed hepatic microscopic abnormalities. It also decreased the levels of LPO but increased the levels of reduced glutathione (GSH) as well as the activities of superoxide-dismutase (SOD) and catalase in the livers of infected mice supplemented with Zn compared to the livers of infected mice not supplemented with Zn. Zinc supplementation was also able to modulate the levels of monokines such as tumour necrosis factor alpha (TNF-alpha), interleukin-1 (IL-1) and interleukin-6 (IL-6). Our results indicate a role for Zn in downregulating oxidative stress and upregulating antioxidant defense enzymes through the action of monokines, suggesting that supplementation with Zn has a protective function in Salmonella-induced liver injury.
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Franco-Vidal V, Beurg M, Darrouzet V, Bébéar JP, Skinner LJ, Dulon D. Zinc protection against pneumolysin toxicity on rat cochlear hair cells. Audiol Neurootol 2007; 13:65-70. [PMID: 17890859 DOI: 10.1159/000108763] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2007] [Accepted: 07/04/2007] [Indexed: 11/19/2022] Open
Abstract
Streptococcus pneumoniae can induce local and systemic diseases such as meningitis, otitis media, and pneumonia. One third of these meningitis cases can be associated with irreversible sensorineural hearing loss whose mechanisms likely involves the exotoxin pneumolysin (PLY) that irreversibly damages cochlear hair cells (HCs). In the respiratory system and in neuron it has been demonstrated that zinc deficiency increases severity and mortality of such infections in animal models and in children. Moreover, zinc supplementation can decrease the severity of pneumococcal respiratory infections. The aim of our study was to assess the potential protective effect of zinc against PLY toxicity on HCs in culture. Our results showed that in the presence of zinc at concentration as low as 1 microM, the toxicity of PLY was largely reduced by about 50% for both inner and outer HCs. At 300 microM of zinc, protection significantly increased with 62 and 55.2% for IHCs and OHCs, respectively. Our results suggest that the protective effect of zinc is likely due to an inhibition of the toxin incorporation and aggregation into the plasma membrane, thus preventing calcium influx through the toxin pores. Our findings raise the possibility that treatments with zinc may help to prevent debilitating otological sequelae from pneumococcal infection.
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Affiliation(s)
- Valérie Franco-Vidal
- Otolaryngology and Skull Base Surgery Department, University of Bordeaux 2 Victor Segalen, Bordeaux, France.
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Abstract
During recent years there have been several incidents in which symptoms of disease have been linked to consumption of food contaminated by chemical substances (e.g., 2,3,7,8-tetrachlorodibenzo-p-dioxin, TCDD). Furthermore, outbreaks of infections in food-producing animals have attracted major attention regarding the safety of consumers, e.g., Bovine Spongiform Encephalitis (BSE) and influenza in chicken. As shown for several xenobiotics in an increasing number of experimental studies, even low-dose xenobiotic exposure may impair immune function over time, as well as microorganism virulence, resulting in more severe infectious diseases and associated complications. Moreover, during ongoing infection, xenobiotic uptake and distribution are often changed resulting in increased toxic insult to the host. The interactions among infectious agents, nutrients, and xenobiotics have thus become a developing concern and new avenue of research in food toxicology as well as in food-borne diseases. From a health perspective, in the risk assessment of xenobiotics in our food and environment, synergistic effects among microorganisms, nutrients, and xenobiotics will have to be considered. Otherwise, such effects may gradually change the disease panorama in society.
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Strand TA, Aaberge IS, Maage A, Ulvestad E, Sommerfelt H. The immune response to pneumococcal polysaccharide vaccine in zinc-depleted mice. Scand J Immunol 2003; 58:76-80. [PMID: 12828561 DOI: 10.1046/j.1365-3083.2003.01283.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Zinc depletion affects several facets of the immune system and the resistance to infections. We assessed the effect of zinc deprivation on the immune response to the pneumococcal polysaccharide antigens in the commercially available Pneumovax pneumococcal vaccine. Young female BALB/c mice were fed diets with 2.7, 5.8 or 25 micro g of elemental zinc per mg diet. After six weeks of pair feeding, there were significant differences in the mean body weights between the feeding groups and we demonstrated a dose response of the zinc level in the diet on growth. The induced zinc deficiency had no discernible effect on the antipneumococcal polysaccharide immunoglobulin M (IgM) response following immunization with the pneumococcal vaccine. Although zinc depletion has a detrimental effect on the immune system, the murine T-cell-independent response to antigens such as those in the pneumococcal polysaccharide capsule does not seem to be affected.
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Affiliation(s)
- T A Strand
- Centre for international Health, University of Bergen, Norway.
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Strand TA, Hollingshead SK, Julshamn K, Briles DE, Blomberg B, Sommerfelt H. Effects of zinc deficiency and pneumococcal surface protein a immunization on zinc status and the risk of severe infection in mice. Infect Immun 2003; 71:2009-13. [PMID: 12654820 PMCID: PMC152078 DOI: 10.1128/iai.71.4.2009-2013.2003] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Streptococcus pneumoniae is a major cause of illness and death in children in developing countries. In these children, zinc deficiency is associated with an increased risk of acute respiratory tract infections, which can be reduced by daily zinc administration. Severe infections decrease zinc levels in plasma and may thereby move individuals with preexisting low zinc stores into a vicious cycle of infection and unavailable zinc. Pneumococcal surface protein A (PspA) has emerged as a promising vaccine candidate, and immunization with this antigen protects animals from pneumococcal infection. In an animal experiment, we measured the effect of zinc depletion on the immune response to parenterally administrated PspA and assessed the effect of this PspA vaccination and zinc depletion on the severity of pneumococcal infection and on zinc status. Mice were kept on different diets for 5 weeks, immunized twice 14 days apart, and challenged intranasally with S. pneumoniae. Mice on the zinc-deficient diet showed substantially reduced immune responses to PspA, more extensive pneumococcal colonization in the nasal mucosa, more severe infections, and an increased risk of death. PspA immunization reduced the risk of severe disease, and the reduction in severity was reflected in substantially reduced zinc depletion from bones.
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Affiliation(s)
- Tor A Strand
- Centre for International Health and Department of Microbiology and Immunology, The Gade Institute, University of Bergen, Bergen N-5021, Norway.
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Reconciling Clinical Criteria and the Use of Genetically Engineered Animals in Sepsis Research. Intensive Care Med 2003. [DOI: 10.1007/978-1-4757-5548-0_4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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