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Frias-De-Diego A, Gilbertie JM, Scholle F, Dejarnette S, Crisci E. Effect of BIO-PLY TM, a Platelet-Rich Plasma Derived Biologic on PRRSV-2-Infected Macrophages. Viruses 2022; 14:v14122666. [PMID: 36560670 PMCID: PMC9783555 DOI: 10.3390/v14122666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 11/22/2022] [Accepted: 11/23/2022] [Indexed: 11/30/2022] Open
Abstract
Porcine Reproductive and Respiratory Syndrome (PRRS) is the one of the most devastating diseases impacting the swine industry worldwide. Control and prevention methods rely on biosafety measures and vaccination. As an RNA virus with a high rate of mutation, vaccines are only partially effective against circulating and newly emerging strains. To reduce the burden of this disease, research on alternative control methods is needed. Here, we assess the in vitro antiviral effect of a novel platelet-rich plasma-derived biologic termed BIO-PLYTM (for the BIOactive fraction of Platelet-rich plasma LYsate) from both swine and equine origin. Our results show that BIO-PLYTM significantly reduces the amount of PRRSV viral load determined by RT-qPCR and the number of infectious viral particles measured by TCID50 in infected porcine alveolar and parenchymal macrophages. This study also showed limited toxicity of BIO-PLYTM in vitro and aspects of its immunomodulatory capacity evaluating the regulation of reactive oxygen species and cytokines production in infected cells. Finally, this study presents promising data on the effect of BIO-PLYTM on other RNA viruses such as human A influenza viruses and coronavirus.
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Affiliation(s)
- Alba Frias-De-Diego
- Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607, USA
| | - Jessica M. Gilbertie
- Department of Biomedical Affairs and Research, Edward Via College of Osteopathic Medicine, Blacksburg, VA 24060, USA
| | - Frank Scholle
- Department of Biological Sciences, North Carolina State University, Raleigh, NC 27695, USA
| | - Sarah Dejarnette
- Department of Biological Sciences, North Carolina State University, Raleigh, NC 27695, USA
| | - Elisa Crisci
- Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607, USA
- Correspondence: ; Tel.: +1-919-513-6255
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2
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Eissa FMA, Eassa AHA, Zalat RS, Negm MS, Elmallawany MA. Potential therapeutic effect of platelet-rich plasma and albendazole on the muscular phase of experimental Trichinella spiralis infection. Food Waterborne Parasitol 2022; 28:e00180. [PMID: 36159633 PMCID: PMC9493052 DOI: 10.1016/j.fawpar.2022.e00180] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 09/03/2022] [Accepted: 09/09/2022] [Indexed: 11/15/2022] Open
Abstract
Trichinellosis is a food-borne parasitic infection causing muscle damage. This study aimed to detect the potential therapeutic effect of platelet-rich plasma (PRP) alone or in combination with albendazole (ALB) on the muscular phase of experimental Trichinella infection in rats. The study was conducted on 70 rats divided into four main groups: healthy non-infected non-treated rats, non-infected rats treated with PRP, infected untreated rats (seven rats in each group), and an infected group of 49 rats. The infected group was further subdivided based on the drug therapy received. The effects of drug therapy were evaluated using parasitological and histopathological analyses. The percent reduction in the number of Trichinella spiralis larvae per gram of muscle in the PRP-treated groups (one, two, and three doses) was 43.1%, 78.8%, and 86.1%, respectively. Groups treated with combined therapy of ALB & PRP (one, two, and three doses) showed overall reduction percentages of 87.7%, 90.9% and 95.2%, respectively. In contrast, the ALB-treated group showed a 69.4% reduction. All results of the abovementioned groups were statistically significant compared to the control-infected non-treated group. The findings of the histopathological analysis were consistent with the parasitological results. Groups receiving combined therapy showed the most significant improvement in terms of the degree of inflammation and fibrosis. It can be concluded that PRP has a modulatory effect on the pathology caused by T. spiralis larvae in the muscular phase of trichinellosis. To our knowledge, this is the first study to investigate the effect of PRP on the muscular phase of T. spiralis infection. PRP has a modulatory effect on the pathology caused by T. spiralis larvae on the muscular phase of trichinellosis. Two and three doses of PRP therapy showed a therapeutic effect in the muscular phase of trichinellosis. Albendazole treatment combined with PRP is a promising treatment option. A potential role of platelets in controlling Trichinella infections is identified.
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Affiliation(s)
- Fatma M A Eissa
- Department of Medical Parasitology, Faculty of Medicine, Cairo University, Egypt
| | - Ahmed H A Eassa
- Department of Medical Parasitology, Faculty of Medicine, Cairo University, Egypt
| | - Rabab S Zalat
- Department of Medical Parasitology, Theadore Bilharz Research Institute, Egypt
| | - Mohamed S Negm
- Department of Pathology, Faculty of Medicine, Cairo University, Egypt
| | - Marwa A Elmallawany
- Department of Medical Parasitology, Faculty of Medicine, Cairo University, Egypt
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Wright JR, Jones S, Parvathy S, Kaczmarek LK, Forsythe I, Farndale RW, Gibbins JM, Mahaut-Smith MP. The voltage-gated K + channel Kv1.3 modulates platelet motility and α 2β 1 integrin-dependent adhesion to collagen. Platelets 2022; 33:451-461. [PMID: 34348571 PMCID: PMC8935947 DOI: 10.1080/09537104.2021.1942818] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 06/03/2021] [Accepted: 06/03/2021] [Indexed: 12/13/2022]
Abstract
Kv1.3 is a voltage-gated K+-selective channel with roles in immunity, insulin-sensitivity, neuronal excitability and olfaction. Despite being one of the largest ionic conductances of the platelet surface membrane, its contribution to platelet function is poorly understood. Here we show that Kv1.3-deficient platelets display enhanced ADP-evoked platelet aggregation and secretion, and an increased surface expression of platelet integrin αIIb. In contrast, platelet adhesion and thrombus formation in vitro under arterial shear conditions on surfaces coated with collagen were reduced for samples from Kv1.3-/- compared to wild type mice. Use of collagen-mimetic peptides revealed a specific defect in the engagement with α2β1. Kv1.3-/- platelets developed significantly fewer, and shorter, filopodia than wild type platelets during adhesion to collagen fibrils. Kv1.3-/- mice displayed no significant difference in thrombus formation within cremaster muscle arterioles using a laser-induced injury model, thus other pro-thrombotic pathways compensate in vivo for the adhesion defect observed in vitro. This may include the increased platelet counts of Kv1.3-/- mice, due in part to a prolonged lifespan. The ability of Kv1.3 to modulate integrin-dependent platelet adhesion has important implications for understanding its contribution to normal physiological platelet function in addition to its reported roles in auto-immune diseases and thromboinflammatory models of stroke.
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Affiliation(s)
- Joy R Wright
- Department of Cardiovascular Sciences, University of Leicester, Leicester, UK
- Department of Molecular and Cell Biology, University of Leicester, Leicester, UK
| | - Sarah Jones
- Department of Molecular and Cell Biology, University of Leicester, Leicester, UK
- Department of Life Sciences, Manchester Metropolitan University, Manchester, UK
| | - Sasikumar Parvathy
- Institute for Cardiovascular and Metabolic Research, University of Reading, Reading, UK
| | - Leonard K Kaczmarek
- Department of Cellular and Molecular Physiology, Yale University School of Medicine, USA
| | - Ian Forsythe
- Department of Neuroscience, Psychology and Behaviour, University of Leicester, Leicester, UK
| | | | - Jonathan M Gibbins
- Institute for Cardiovascular and Metabolic Research, University of Reading, Reading, UK
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Muir AJT, Niehaus AJ, Lozier JW, Cole SL, Belacic ZA, Ballash GA, Durgam SS. Autologous platelet-rich plasma effects on Staphylococcus aureus-induced chondrocyte death in an in vitro bovine septic arthritis model. Am J Vet Res 2022; 83:119-126. [PMID: 34851853 DOI: 10.2460/ajvr.21.01.0007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To investigate the chondroprotective effects of autologous platelet-rich plasma (PRP), ampicillin-sulbactam (AmpS), or PRP combined with AmpS (PRP+AmpS) in an in vitro chondrocyte explant model of bovine Staphylococcus aureus-induced septic arthritis. SAMPLE Autologous PRP and cartilage explants obtained from 6 healthy, adult, nonlactating Jersey-crossbred cows. ProcedureS Autologous PRP was prepared prior to euthanasia using an optimized double centrifugation protocol. Cartilage explants collected from grossly normal stifle joints were incubated in synovial fluid (SF) alone, S aureus-inoculated SF (SA), or SA supplemented with PRP (25% culture medium volume), AmpS (2 mg/mL), or both PRP (25% culture medium volume) and AmpS (2 mg/mL; PRP+AmpS) for 24 hours. The metabolic activity, percentage of dead cells, and glycosaminoglycan content of cartilage explants were measured with a resazurin-based assay, live-dead cell staining, and dimethylmethylene blue assay, respectively. Treatment effects were assessed relative to the findings for cartilage explants incubated in SF alone. RESULTS Application of PRP, AmpS, and PRP+AmpS treatments significantly reduced S aureus-induced chondrocyte death (ie, increased metabolic activity and cell viability staining) in cartilage explants, compared with untreated controls. There were no significant differences in chondrocyte death among explants treated with PRP, AmpS, or PRP+AmpS. CLINICAL RELEVANCE In this in vitro explant model of S aureus-induced septic arthritis, PRP, AmpS, and PRP+AmpS treatments mitigated chondrocyte death. Additional work to confirm the efficacy of PRP with bacteria commonly associated with clinical septic arthritis in cattle as well as in vivo evaluation is warranted.
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Affiliation(s)
- Andrew J T Muir
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH
| | - Andrew J Niehaus
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH
| | - Joseph W Lozier
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH
| | - Sara L Cole
- Optical Microscopy Core, Notre Dame Integrated Imaging Facility, University of Notre Dame, Notre Dame, IN
| | - Zarah A Belacic
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH
| | - Gregory A Ballash
- Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH
| | - Sushmitha S Durgam
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH
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Ebermeyer T, Cognasse F, Berthelot P, Mismetti P, Garraud O, Hamzeh-Cognasse H. Platelet Innate Immune Receptors and TLRs: A Double-Edged Sword. Int J Mol Sci 2021; 22:ijms22157894. [PMID: 34360659 PMCID: PMC8347377 DOI: 10.3390/ijms22157894] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 07/14/2021] [Accepted: 07/20/2021] [Indexed: 12/17/2022] Open
Abstract
Platelets are hematopoietic cells whose main function has for a long time been considered to be the maintenance of vascular integrity. They have an essential role in the hemostatic response, but they also have functional capabilities that go far beyond it. This review will provide an overview of platelet functions. Indeed, stress signals may induce platelet apoptosis through proapoptotis or hemostasis receptors, necrosis, and even autophagy. Platelets also interact with immune cells and modulate immune responses in terms of activation, maturation, recruitment and cytokine secretion. This review will also show that platelets, thanks to their wide range of innate immune receptors, and in particular toll-like receptors, and can be considered sentinels actively participating in the immuno-surveillance of the body. We will discuss the diversity of platelet responses following the engagement of these receptors as well as the signaling pathways involved. Finally, we will show that while platelets contribute significantly, via their TLRs, to immune response and inflammation, these receptors also participate in the pathophysiological processes associated with various pathogens and diseases, including cancer and atherosclerosis.
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Affiliation(s)
- Théo Ebermeyer
- INSERM U1059-SAINBIOSE, Université de Lyon, F-42023 Saint-Etienne, France; (T.E.); (F.C.); (P.M.); (O.G.)
| | - Fabrice Cognasse
- INSERM U1059-SAINBIOSE, Université de Lyon, F-42023 Saint-Etienne, France; (T.E.); (F.C.); (P.M.); (O.G.)
- Etablissement Français du Sang Auvergne-Rhône-Alpes, 25 bd Pasteur, F-42100 Saint-Étienne, France
| | - Philippe Berthelot
- Team GIMAP, CIRI—Centre International de Recherche en Infectiologie, Université de Lyon, U1111, UMR5308, F-69007 Lyon, France;
- Infectious Diseases Department, CHU de St-Etienne, F-42055 Saint-Etienne, France
| | - Patrick Mismetti
- INSERM U1059-SAINBIOSE, Université de Lyon, F-42023 Saint-Etienne, France; (T.E.); (F.C.); (P.M.); (O.G.)
- Department of Vascular Medicine and Therapeutics, INNOVTE, CHU de St-Etienne, F-42055 Saint-Etienne, France
| | - Olivier Garraud
- INSERM U1059-SAINBIOSE, Université de Lyon, F-42023 Saint-Etienne, France; (T.E.); (F.C.); (P.M.); (O.G.)
| | - Hind Hamzeh-Cognasse
- INSERM U1059-SAINBIOSE, Université de Lyon, F-42023 Saint-Etienne, France; (T.E.); (F.C.); (P.M.); (O.G.)
- Correspondence:
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Loza-Correa M, Yousuf B, Ramirez-Arcos S. Staphylococcus epidermidis undergoes global changes in gene expression during biofilm maturation in platelet concentrates. Transfusion 2021; 61:2146-2158. [PMID: 33904608 DOI: 10.1111/trf.16418] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 03/31/2021] [Accepted: 03/31/2021] [Indexed: 12/24/2022]
Abstract
BACKGROUND Staphylococcus epidermidis forms surface-attached aggregates (biofilms) when grown in platelet concentrates (PCs). Comparative transcriptome analyses were undertaken to investigate differential gene expression of S. epidermidis biofilms grown in PCs. STUDY DESIGN AND METHODS Two S. epidermidis strains isolated from human skin (AZ22 and AZ39) and one strain isolated from contaminated PCs (ST02) were grown in glucose-supplemented Trypticase Soy Broth (TSBg) and PCs. RNA was extracted and sequenced using Illumina HiSeq. Differential expression analysis was done using DESeq, and significantly differentially expressed genes (DEGs) were selected. DEGs were subjected to Kyoto encyclopedia of genes and genomes and Gene Ontology analyses. Differential gene expression was validated with quantitative reverse transcription-PCR. RESULTS A total of 436, 442, and 384 genes were expressed in AZ22, AZ39, and ST02, respectively. DEG analysis showed that 170, 172, and 117 genes were upregulated in PCs in comparison to TSBg, whereas 120, 135, and 89 genes were downregulated (p < .05) in mature biofilms of AZ22, AZ39, and ST02, respectively. Twenty-seven DEGs were shared by all three strains. While 76 DEGs were shared by AZ22 and AZ39, only 34 and 21 DEGs were common between ST02, and AZ22 and AZ39, respectively. Significant transcriptional expression changes were observed in genes involved in platelet-bacteria interaction, biofilm formation, production of virulence factors, and resistance to antimicrobial peptides and antibiotics. CONCLUSION Differential gene expression in S. epidermidis is triggered by the stressful PC storage environment. Upregulation of virulence and antimicrobial resistance genes could have clinical implications for transfusion patients.
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Affiliation(s)
- Maria Loza-Correa
- Centre for Innovation, Canadian Blood Services, Ottawa, Ontario, Canada
| | - Basit Yousuf
- Centre for Innovation, Canadian Blood Services, Ottawa, Ontario, Canada.,Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario, Canada
| | - Sandra Ramirez-Arcos
- Centre for Innovation, Canadian Blood Services, Ottawa, Ontario, Canada.,Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario, Canada
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Bianchi E, Ruggeri M, Rossi S, Vigani B, Miele D, Bonferoni MC, Sandri G, Ferrari F. Innovative Strategies in Tendon Tissue Engineering. Pharmaceutics 2021; 13:89. [PMID: 33440840 PMCID: PMC7827834 DOI: 10.3390/pharmaceutics13010089] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Revised: 12/31/2020] [Accepted: 01/08/2021] [Indexed: 12/15/2022] Open
Abstract
The tendon is a highly aligned connective tissue that transmits force from muscle to bone. Each year, more than 32 million tendon injuries have been reported, in fact, tendinopathies represent at least 50% of all sports injuries, and their incidence rates have increased in recent decades due to the aging population. Current clinical grafts used in tendon treatment are subject to several restrictions and there is a significant demand for alternative engineered tissue. For this reason, innovative strategies need to be explored. Tendon replacement and regeneration are complex since scaffolds need to guarantee an adequate hierarchical structured morphology and mechanical properties to stand the load. Moreover, to guide cell proliferation and growth, scaffolds should provide a fibrous network that mimics the collagen arrangement of the extracellular matrix in the tendons. This review focuses on tendon repair and regeneration. Particular attention has been devoted to the innovative approaches in tissue engineering. Advanced manufacturing techniques, such as electrospinning, soft lithography, and three-dimensional (3D) printing, have been described. Furthermore, biological augmentation has been considered, as an emerging strategy with great therapeutic potential.
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Affiliation(s)
| | | | | | | | | | | | - Giuseppina Sandri
- Department of Drug Sciences, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy; (E.B.); (M.R.); (S.R.); (B.V.); (D.M.); (M.C.B.); (F.F.)
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8
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Antibacterial effects of platelet-rich fibrin produced by horizontal centrifugation. Int J Oral Sci 2020; 12:32. [PMID: 33243983 PMCID: PMC7693325 DOI: 10.1038/s41368-020-00099-w] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 09/06/2020] [Accepted: 10/18/2020] [Indexed: 12/13/2022] Open
Abstract
Platelet-rich fibrin (PRF) has been widely used owing to its ability to stimulate tissue regeneration. To date, few studies have described the antibacterial properties of PRF. Previously, PRF prepared by horizontal centrifugation (H-PRF) was shown to contain more immune cells than leukocyte- and platelet-rich fibrin (L-PRF). This study aimed to compare the antimicrobial effects of PRFs against Staphylococcus aureus and Escherichia coli in vitro and to determine whether the antibacterial effects correlated with the number of immune cells. Blood samples were obtained from eight healthy donors to prepare L-PRF and H-PRF. The sizes and weights of L-PRF and H-PRF were first evaluated, and their antibacterial effects against S. aureus and E. coli were then tested in vitro using the inhibition ring and plate-counting test methods. Flow-cytometric analysis of the cell components of L-PRF and H-PRF was also performed. No significant differences in size or weight were observed between the L-PRF and H-PRF groups. The H-PRF group contained more leukocytes than the L-PRF group. While both PRFs had notable antimicrobial activity against S. aureus and E. coli, H-PRF demonstrated a significantly better antibacterial effect than L-PRF. Furthermore, the antimicrobial ability of the PRF solid was less efficient than that of wet PRF. In conclusion, H-PRF exhibited better antibacterial activity than L-PRF, which might have been attributed to having more immune cells.
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Jin Y, Yu X, Zhang S, Kong X, Chen W, Luo Q, Zheng B, Xiao Y. Comparative Analysis of Virulence and Toxin Expression of Vancomycin-Intermediate and Vancomycin-Sensitive Staphylococcus aureus Strains. Front Microbiol 2020; 11:596942. [PMID: 33193280 PMCID: PMC7661696 DOI: 10.3389/fmicb.2020.596942] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Accepted: 10/12/2020] [Indexed: 01/19/2023] Open
Abstract
Previous studies on vancomycin-intermediate Staphylococcus aureus (VISA) have mainly focused on drug resistance, the evolution of differences in virulence between VISA and vancomycin-sensitive S. aureus (VSSA) requires further investigation. To address this issue, in this study, we compared the virulence and toxin profiles of pair groups of VISA and VSSA strains, including a series of vancomycin-resistant induced S. aureus strains—SA0534, SA0534-V8, and SA0534-V16. We established a mouse skin infection model to evaluate the invasive capacity of VISA strains, and found that although mice infected with VISA had smaller-sized abscesses than those infected with VSSA, the abscesses persisted for a longer period (up to 9 days). Infection with VISA strains was associated with a lower mortality rate in Galleria mellonella larvae compared to infection with VSSA strains (≥ 40% vs. ≤ 3% survival at 28 h). Additionally, VISA were more effective in colonizing the nasal passage of mice than VSSA, and in vitro experiments showed that while VISA strains were less virulent they showed enhanced intracellular survival compared to VSSA strains. RNA sequencing of VISA strains revealed significant differences in the expression levels of the agr, hla, cap, spa, clfB, and sbi genes and suggested that platelet activation is only weakly induced by VISA. Collectively, our findings indicate that VISA is less virulent than VSSA but has a greater capacity to colonize human hosts and evade destruction by the host innate immune system, resulting in persistent and chronic S. aureus infection.
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Affiliation(s)
- Ye Jin
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Xiao Yu
- Department of Respiratory and Critical Care Medicine, First Hospital of Shanxi Medical University, Taiyuan, China
| | - Shuntian Zhang
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Xiaoyang Kong
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Weiwei Chen
- Department of Laboratory Medicine, College of Medicine, Zhejiang University, Hangzhou, China
| | - Qixia Luo
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Beiwen Zheng
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Yonghong Xiao
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
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10
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Schuldt L, Bi J, Owen G, Shen Y, Haapasalo M, Häkkinen L, Larjava H. Decontamination of rough implant surfaces colonized by multispecies oral biofilm by application of leukocyte- and platelet-rich fibrin. J Periodontol 2020; 92:875-885. [PMID: 32853401 DOI: 10.1002/jper.20-0205] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 07/19/2020] [Accepted: 08/10/2020] [Indexed: 11/10/2022]
Abstract
BACKGROUND Decontamination of biofilm-infected rough implant surfaces is challenging. Platelet rich blood products have been shown to have anti-microbial properties against periodontal pathogens. Our aim was to investigate the effect of a potential biological implant surface disinfectant, leukocyte- and platelet-rich fibrin (L-PRF), on a mature oral multispecies biofilm on a rough titanium surface. METHODS Sandblasted, large grit, acid-etched (SLA) titanium disks were inoculated with subgingival dental plaque and cultured anaerobically for 21 days. The L-PRF membranes were collected from 12 donors in three trials (four donors in each trial). The disks were rinsed with 0.9% NaCl and exposed to the cell-rich portion of the L-PRF membranes for 48 hours followed by scanning electron microscope (SEM) analysis immediately or after rinsing with 0.9% NaCl prior to fixation. The presence of platelet factor-4 in the rinse samples was analyzed by Western blotting. Remaining bacteria were quantified from SEM images of the implant surfaces and their numbers statistically compared. RESULTS The L-PRF-treated samples without rinsing displayed numerous cells with multiple pseudopodia in immediate contact with bacteria that appeared perforated and increased in size. The cells were identified as platelets based on morphological criteria and by positive reaction for platelet factor-4 by Western blotting. After post-treatment rinsing, the L-PRF-treated disks displayed a significant reduction in bacterial counts (in average 92% reduction). CONCLUSION Application of L-PRF significantly reduced bacterial counts on contaminated SLA titanium surface, most likely through anti-microbial action by platelets.
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Affiliation(s)
- Luisa Schuldt
- Department of Oral Biological and Medical Sciences, Faculty of Dentistry, University of British Columbia, Vancouver, British Columbia
| | - Jiarui Bi
- Department of Oral Biological and Medical Sciences, Faculty of Dentistry, University of British Columbia, Vancouver, British Columbia
| | - Gethin Owen
- Department of Oral Biological and Medical Sciences, Faculty of Dentistry, University of British Columbia, Vancouver, British Columbia
| | - Ya Shen
- Department of Oral Biological and Medical Sciences, Faculty of Dentistry, University of British Columbia, Vancouver, British Columbia
| | - Markus Haapasalo
- Department of Oral Biological and Medical Sciences, Faculty of Dentistry, University of British Columbia, Vancouver, British Columbia
| | - Lari Häkkinen
- Department of Oral Biological and Medical Sciences, Faculty of Dentistry, University of British Columbia, Vancouver, British Columbia
| | - Hannu Larjava
- Department of Oral Biological and Medical Sciences, Faculty of Dentistry, University of British Columbia, Vancouver, British Columbia
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11
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Kohler C, Proctor RA, Bayer AS, Yeaman MR, Lalk M, Engelmann S, Mishra NN. Proteomic and Membrane Lipid Correlates of Reduced Host Defense Peptide. Antibiotics (Basel) 2019; 8:antibiotics8040169. [PMID: 31569354 PMCID: PMC6963496 DOI: 10.3390/antibiotics8040169] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Revised: 09/19/2019] [Accepted: 09/24/2019] [Indexed: 12/31/2022] Open
Abstract
We previously described a transposon mutant in Staphylococcus aureus strain SH1000 that exhibited reduced susceptibility to cationic thrombin-induced platelet microbicidal proteins (tPMPs). The transposon insertion site was mapped to the gene snoD, the staphylococcal nuo orthologue. Hence, further studies have been performed to understand how this mutation impacts susceptibility to tPMP, by comparing proteomics profiling and membrane lipid analyses of the parent vs. mutant strains. Surprisingly, the mutant showed differential regulation of only a single protein when cultivated aerobically (FadB), and only a small number of proteins under anaerobic growth conditions (AdhE, DapE, Ddh, Ald1, IlvA1, AgrA, Rot, SA2366, and SA2367). Corresponding to FadB impact on lipid remodeling, membrane fatty acid analyses showed that the snoD mutant contained more short chain anteiso-, but fewer short chain iso-branched chain fatty acids under both aerobic and anaerobic conditions vs. the parental strain. Based upon these proteomic and membrane compositional data, a hypothetical “network” model was developed to explain the impact of the snoD mutation upon tPMP susceptibility.
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Affiliation(s)
- Christian Kohler
- Universität Greifswald, Institut für Mikrobiologie und Molekularbiologie,17487 Greifswald, Germany.
| | - Richard A Proctor
- University of Wisconsin School of Medicine and Public Health, Madison, WI 53705, USA.
| | - Arnold S Bayer
- Division of Infectious Diseases, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center Torrance, CA 90502, USA
- David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
| | - Michael R Yeaman
- Division of Infectious Diseases, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center Torrance, CA 90502, USA.
- David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA.
- Division of Molecular Medicine, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Torrance, CA 90502, USA.
| | - Michael Lalk
- University Greifswald, Institute of Biochemistry, 17487 Greifswald, Germany.
| | - Susanne Engelmann
- Universität Greifswald, Institut für Mikrobiologie und Molekularbiologie,17487 Greifswald, Germany.
- Institute for Microbiology, Technical University Braunschweig, Institute for Microbiology, 38106 Braunschweig, Germany.
- Helmholtz Center for Infectious Research, Microbial Proteomics, 38124 Braunschweig, Germany.
| | - Nagendra N Mishra
- Division of Infectious Diseases, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center Torrance, CA 90502, USA.
- David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA.
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12
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Zhang W, Guo Y, Kuss M, Shi W, Aldrich AL, Untrauer J, Kielian T, Duan B. Platelet-Rich Plasma for the Treatment of Tissue Infection: Preparation and Clinical Evaluation. TISSUE ENGINEERING PART B-REVIEWS 2019; 25:225-236. [PMID: 30712506 DOI: 10.1089/ten.teb.2018.0309] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
IMPACT STATEMENT The clinical application of platelet-rich plasma (PRP) has been widely studied for its effects on trauma or injury repair/regeneration, however the antibacterial property of PRP has been overlooked. Increasing evidence suggests PRP as a good antibacterial agent and that it could help prevent/treat tissue infection. This review emphasizes the importance of PRP's antibacterial property and summarizes the preclinical and clinical findings regarding the application of PRP in the prevention and treatment of wound and bone infection. The use of biocompatible PRP may be advantageous for tissue infection treatment due to its inherent antibacterial and healing promoting properties.
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Affiliation(s)
- Wenhai Zhang
- 1 Department of Orthopedics, Tianjin Hospital, Tianjin, People's Republic of China.,2 Mary and Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, Nebraska
| | - Yue Guo
- 3 Tissue Engineering Labs of Orthopedics Institute, Tianjin Hospital, Tianjin, People's Republic of China
| | - Mitchell Kuss
- 2 Mary and Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, Nebraska.,4 Division of Cardiology, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska
| | - Wen Shi
- 2 Mary and Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, Nebraska.,4 Division of Cardiology, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska
| | - Amy L Aldrich
- 5 Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska
| | - Jason Untrauer
- 6 Division of Oral and Maxillofacial Surgery, Department of Surgery, College of Medicine, University of Nebraska Medical Center, Omaha, Nebraska
| | - Tammy Kielian
- 5 Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska
| | - Bin Duan
- 2 Mary and Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, Nebraska.,4 Division of Cardiology, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska.,7 Department of Surgery, College of Medicine, University of Nebraska Medical Center, Omaha, Nebraska.,8 Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska
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13
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The peptidoglycan and biofilm matrix of Staphylococcus epidermidis undergo structural changes when exposed to human platelets. PLoS One 2019; 14:e0211132. [PMID: 30682094 PMCID: PMC6347161 DOI: 10.1371/journal.pone.0211132] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Accepted: 01/02/2019] [Indexed: 11/19/2022] Open
Abstract
Staphylococcus epidermidis is a bacterium frequently isolated from contaminated platelet concentrates (PCs), a blood product used to treat bleeding disorders in transfusion patients. PCs offer an accidental niche for colonization of S. epidermidis by forming biofilms and thus avoiding clearance by immune factors present in this milieu. Using biochemical and microscopy techniques, we investigated the structural changes of the peptidoglycan (PG) and the biofilm matrix of S. epidermidis biofilms formed in whole-blood derived PCs compared to biofilms grown in glucose-supplemented trypticase soy broth (TSBg). Both, the PG and the biofilm matrix are primary mechanisms of defense against environmental stress. Here we show that in PCs, the S. epidermidis biofilm matrix is mainly of a proteinaceous nature with extracellular DNA, in contrast to the predominant polysaccharide nature of the biofilm matrix formed in TSBg cultures. PG profile studies demonstrated that the PG of biofilm cells remodels during PC storage displaying fewer muropeptides variants than those observed in TSBg. The PG muropeptides contain two chemical modifications (amidation and O-acetylation) previously associated with resistance to antimicrobial agents by other staphylococci. Our study highlights two key structural features of S. epidermidis that are remodeled when exposed to human platelets and could be used as targets to reduce septic transfusions events.
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14
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The Role of Platelets in Antimicrobial Host Defense. Platelets 2019. [DOI: 10.1016/b978-0-12-813456-6.00029-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
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15
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Cieślik-Bielecka A, Reichert P, Skowroński R, Królikowska A, Bielecki T. A new aspect of in vitro antimicrobial leukocyte- and platelet-rich plasma activity based on flow cytometry assessment. Platelets 2018; 30:728-736. [PMID: 30252585 DOI: 10.1080/09537104.2018.1513472] [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: 12/26/2022]
Abstract
The current literature suggests that the antibacterial effect of leukocyte- and platelet-rich plasma (L-PRP) is directly related to platelet and leukocyte concentrations. The aim of this study was twofold: first, to evaluate the antimicrobial effect of L-PRP against selected bacterial strains in vitro, and second, to correlate this effect with leukocyte and platelet content in the final concentration. Blood was collected from 20 healthy males, and L-PRP, acellular plasma (AP), and autologous thrombin were consecutively prepared. Flow cytometry analysis of the blood, L-PRP, and AP was performed. The L-PRP gel, liquid L-PRP, and thrombin samples were tested in vitro for their antibacterial properties against seven selected bacterial strains using the Kirby-Bauer disk-diffusion method. There was notable antimicrobial activity against selected bacterial strains. No statistically significant correlations between antimicrobial activities and the platelet concentration in L-PRP were observed. Statistically significant positive correlations between selected leukocyte subtypes and antimicrobial activity were noted. A negative correlation was found between elevated monocyte count and antimicrobial activity of L-PRP against one bacterial strain studied. L-PRP possesses antimicrobial activity and can be potentially useful in the fight against certain postoperative infections. The bactericidal effect of L-PRP is caused by leukocytes, and there exists a relationship among selected leukocyte subtypes and L-PRP antimicrobial activity.
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Affiliation(s)
| | - Paweł Reichert
- b Division of Sports Medicine, Department of Physiotherapy, Faculty of Health Sciences , Wroclaw Medical University , Wroclaw , Poland
| | - Rafał Skowroński
- c Department of Orthopaedics , Medical University of Białystok , Białystok , Poland
| | - Aleksandra Królikowska
- d Department of Physiotherapy , The College of Physiotherapy in Wroclaw , Wroclaw , Poland
| | - Tomasz Bielecki
- e Department of Orthopaedics , Medical University of Silesia, Trauma Center , Sosnowiec , Poland
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16
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Amison RT, O'Shaughnessy BG, Arnold S, Cleary SJ, Nandi M, Pitchford SC, Bragonzi A, Page CP. Platelet Depletion Impairs Host Defense to Pulmonary Infection with Pseudomonas aeruginosa in Mice. Am J Respir Cell Mol Biol 2018; 58:331-340. [PMID: 28957635 DOI: 10.1165/rcmb.2017-0083oc] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Platelets have been implicated in pulmonary inflammatory cell recruitment after exposure to allergic and nonallergic stimuli, but little is known about the role of platelets in response to pulmonary infection with Pseudomonas aeruginosa. In this study, we have investigated the impact of the experimental depletion of circulating platelets on a range of inflammatory and bacterial parameters, and their subsequent impact on mortality in a murine model of pulmonary infection with P. aeruginosa. P. aeruginosa infection in mice induced a mild, but significant, state of peripheral thrombocytopenia in addition to pulmonary platelet accumulation. Increased platelet activation was detected in infected mice through increased levels of the platelet-derived mediators, platelet factor-4 and β-thromboglobulin, in BAL fluid and blood plasma. In mice depleted of circulating platelets, pulmonary neutrophil recruitment was significantly reduced 24 hours after infection, whereas the incidence of systemic dissemination of bacteria was significantly increased compared with non-platelet-depleted control mice. Furthermore, mortality rates were increased in bacterial-infected mice depleted of circulating platelets. This work demonstrates a role for platelets in the host response toward a gram-negative bacterial respiratory infection.
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Affiliation(s)
- Richard T Amison
- 1 Sackler Institute of Pulmonary Pharmacology, Institute of Pharmaceutical Science and
| | - Blaze G O'Shaughnessy
- 1 Sackler Institute of Pulmonary Pharmacology, Institute of Pharmaceutical Science and
| | - Stephanie Arnold
- 1 Sackler Institute of Pulmonary Pharmacology, Institute of Pharmaceutical Science and
| | - Simon J Cleary
- 1 Sackler Institute of Pulmonary Pharmacology, Institute of Pharmaceutical Science and
| | - Manasi Nandi
- 2 British Heart Foundation Centre for Cardiovascular Research, King's College London, London, United Kingdom; and
| | - Simon C Pitchford
- 1 Sackler Institute of Pulmonary Pharmacology, Institute of Pharmaceutical Science and
| | - Alessandra Bragonzi
- 3 Infections and Cystic Fibrosis Unit, Division of Immunology, Transplantation, and Infectious Diseases, Scientific Institute for Research, Hospitalisation and Health Care San Raffaele Scientific Institute, Milan, Italy
| | - Clive P Page
- 1 Sackler Institute of Pulmonary Pharmacology, Institute of Pharmaceutical Science and
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17
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Mendes BB, Gómez-Florit M, Babo PS, Domingues RM, Reis RL, Gomes ME. Blood derivatives awaken in regenerative medicine strategies to modulate wound healing. Adv Drug Deliv Rev 2018; 129:376-393. [PMID: 29288732 DOI: 10.1016/j.addr.2017.12.018] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Revised: 12/04/2017] [Accepted: 12/22/2017] [Indexed: 02/06/2023]
Abstract
Blood components play key roles in the modulation of the wound healing process and, together with the provisional fibrin matrix ability to selectively bind bioactive molecules and control its spatial-temporal presentation, define the complex microenvironment that characterize this biological process. As a biomimetic approach, the use of blood derivatives in regenerative strategies has awakened as a source of multiple therapeutic biomolecules. Nevertheless, and despite their clinical relevance, blood derivatives have been showing inconsistent therapeutic results due to several factors, including proper control over their delivery mechanisms. Herein, we highlight recent trends on the use biomaterials to protect, sequester and deliver these pools of biomolecules in tissue engineering and regenerative medicine approaches. Particular emphasis is given to strategies that enable to control their spatiotemporal delivery and improve the selectivity of presentation profiles of the biomolecules derived from blood derivatives rich in platelets. Finally, we discussed possible directions for biomaterials design to potentiate the aimed regenerative effects of blood derivatives and achieve efficient therapies.
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18
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Garcia-de-la-Maria C, Xiong YQ, Pericas JM, Armero Y, Moreno A, Mishra NN, Rybak MJ, Tran TT, Arias CA, Sullam PM, Bayer AS, Miro JM. Impact of High-Level Daptomycin Resistance in the Streptococcus mitis Group on Virulence and Survivability during Daptomycin Treatment in Experimental Infective Endocarditis. Antimicrob Agents Chemother 2017; 61:e02418-16. [PMID: 28264848 PMCID: PMC5404581 DOI: 10.1128/aac.02418-16] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Accepted: 02/16/2017] [Indexed: 11/20/2022] Open
Abstract
Among the viridans group streptococci, the Streptococcus mitis group is the most common cause of infective endocarditis. These bacteria have a propensity to be β-lactam resistant, as well as to rapidly develop high-level and durable resistance to daptomycin (DAP). We compared a parental, daptomycin-susceptible (DAPs) S. mitis/S. oralis strain and its daptomycin-resistant (DAPr) variant in a model of experimental endocarditis in terms of (i) their relative fitness in multiple target organs in this model (vegetations, kidneys, spleen) when animals were challenged individually and in a coinfection strategy and (ii) their survivability during therapy with daptomycin-gentamicin (an in vitro combination synergistic against the parental strain). The DAPr variant was initially isolated from the cardiac vegetations of animals with experimental endocarditis caused by the parental DAPs strain following treatment with daptomycin. The parental strain and the DAPr variant were comparably virulent when animals were individually challenged. In contrast, in the coinfection model without daptomycin therapy, at both the 106- and 107-CFU/ml challenge inocula, the parental strain outcompeted the DAPr variant in all target organs, especially the kidneys and spleen. When the animals in the coinfection model of endocarditis were treated with DAP-gentamicin, the DAPs strain was completely eliminated, while the DAPr variant persisted in all target tissues. These data underscore that the acquisition of DAPr in S. mitis/S. oralis does come at an intrinsic fitness cost, although this resistance phenotype is completely protective against therapy with a potentially synergistic DAP regimen.
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Affiliation(s)
| | - Y Q Xiong
- LA Biomedical Research Institute, Torrance, California, USA
- Geffen School of Medicine at UCLA, Los Angeles, California, USA
| | - J M Pericas
- Hospital Clinic-IDIBAPS, University of Barcelona, Barcelona, Spain
| | - Y Armero
- Hospital Clinic-IDIBAPS, University of Barcelona, Barcelona, Spain
| | - A Moreno
- Hospital Clinic-IDIBAPS, University of Barcelona, Barcelona, Spain
| | - N N Mishra
- LA Biomedical Research Institute, Torrance, California, USA
- Geffen School of Medicine at UCLA, Los Angeles, California, USA
| | - M J Rybak
- Anti-Infective Research Laboratory, Wayne State University, Detroit, Michigan, USA
| | - T T Tran
- University of Texas School of Medicine, Houston, Texas, USA
| | - C A Arias
- University of Texas School of Medicine, Houston, Texas, USA
| | - P M Sullam
- Veterans Affairs Medical Center and the University of California, San Francisco, California, USA
| | - A S Bayer
- LA Biomedical Research Institute, Torrance, California, USA
- Geffen School of Medicine at UCLA, Los Angeles, California, USA
| | - J M Miro
- Hospital Clinic-IDIBAPS, University of Barcelona, Barcelona, Spain
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19
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Tekin N, Cihan AC, Karaca B, Cokmus C. A Comparative Study: Taxonomic Grouping of Alkaline Protease Producing Bacilli. Pol J Microbiol 2017; 66:39-56. [PMID: 29359694 DOI: 10.5604/17331331.1234992] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Alkaline proteases have biotechnological importance due to their activity and stability at alkaline pH. 56 bacteria, capable of growing under alkaline conditions were isolated and their alkaline protease activities were carried out at different parameters to determine their optimum alkaline protease production conditions. Seven isolates were showed higher alkaline protease production capacity than the reference strains. The highest alkaline protease producing isolates (103125 U/g), E114 and C265, were identified as Bacillus licheniformis with 99.4% and Bacillus mojavensis 99.8% based on 16S rRNA gene sequence similarities, respectively. Interestingly, the isolates identified as Bacillus safensis were also found to be high alkaline protease producing strains. Genotypic characterizations of the isolates were also determined by using a wide range of molecular techniques (ARDRA, ITS-PCR, (GTG)5-PCR, BOX-PCR). These different techniques allowed us to differentiate the alkaliphilic isolates and the results were in concurrence with phylogenetic analyses of the 16S rRNA genes. While ITS-PCR provided the highest correlation with 16S rRNA groups, (GTG)5-PCR showed the highest differentiation at species and intra-species level. In this study, each of the biotechnologically valuable alkaline protease producing isolates was grouped into their taxonomic positions with multi-genotypic analyses.
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Affiliation(s)
- Nilgun Tekin
- Biotechnology Institute, Ankara University, Besevler, Ankara, Turkey
| | - Arzu Coleri Cihan
- Faculty of Science, Biology Department, Ankara University, Tandogan, Ankara, Turkey
| | - Basar Karaca
- Faculty of Science, Biology Department, Ankara University, Tandogan, Ankara, Turkey
| | - Cumhur Cokmus
- Konya Food and Agriculture University, Dede Korkut Mahallesi, Beyşehir, Meram, Konya, Turkey
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20
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Siwaprapakorn W, Panamonta M, Chaikitpinyo A, Lumbiganon P, Panamonta O, Pachirat O, Prathanee S, Wongswadiwat Y, Jirapradittha J, Thepsuthammarat K. Original article. Childhood infective endocarditis in Khon Kaen University Hospital from 1992 to 2011. ASIAN BIOMED 2017. [DOI: 10.5372/1905-7415.0806.349] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Abstract
Background: Infective endocarditis (IE) is an important cause of child morbidity and mortality, but the current burden of the disease in Thai children is unknown.
Objectives: To determine the current burden of IE in Thai children.
Patients and Methods: The records of all children aged <15 years admitted to Khon Kaen University Hospital from 1992 to 2011 were reviewed.
Results: Of 69,822 admissions, 56 patients fulfilled the modified Duke criteria for definite IE giving a rate of 0.8 cases per 1,000 admissions. Age at diagnosis was 7.9 ± 3.8 years (range, 8 days to 14.8 years). There was congenital heart disease in 38 (68%) patients, rheumatic heart disease (RHD) in 10 (18%), and no previous heart disease in 8 (14%). RHD was a less frequent underlying disease during the latter half (2002-2011) of the period studied (1/34 vs. 9/22, P < 0.001). Blood cultures were positive for pathogens in 34 (61%) patients with 11 cases of Streptococcus viridians and 8 cases of Staphylococcus aureus infections. Vegetations on echocardiography were present in 46 (82%) patients. For 8 embolic events, patients with large vegetations had a higher rate (4/6) than patients with small and no vegetations (4/50) (P < 0.003). In-hospital mortality was 11%. Eight patients with S. aureus infection had a higher mortality (5/8) than 26 patients (1/26) infected with other pathogens (P < 0.001).
Conclusion: The changing epidemiology of pediatric IE was toward fewer children with RHD. Mortality among children with IE was higher in those with S. aureus infection.
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Affiliation(s)
- Warawut Siwaprapakorn
- Department of Pediatrics, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Manat Panamonta
- Department of Pediatrics, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Arnkisa Chaikitpinyo
- Department of Pediatrics, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Pagakrong Lumbiganon
- Department of Pediatrics, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Ouyporn Panamonta
- Department of Pediatrics, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Orathai Pachirat
- Department of Internal Medicine, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Sompop Prathanee
- Department of Surgery, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Yuttapong Wongswadiwat
- Department of Pediatrics, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Junya Jirapradittha
- Department of Pediatrics, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Kaewjai Thepsuthammarat
- Clinical Epidemiology Unit, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
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21
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Babo PS, Pires RL, Santos L, Franco A, Rodrigues F, Leonor I, Reis RL, Gomes ME. Platelet Lysate-Loaded Photocrosslinkable Hyaluronic Acid Hydrogels for Periodontal Endogenous Regenerative Technology. ACS Biomater Sci Eng 2017; 3:1359-1369. [DOI: 10.1021/acsbiomaterials.6b00508] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Pedro S. Babo
- 3B’s
Research Group−Biomaterials, Biodegradables and Biomimetics, University of Minho, Avepark−Zona Industrial da Gandra, 4806-017 Barco GMR, Portugal
- ICVS/3B’s−PT
Government Associate Laboratory, University of Minho, Braga/Guimarães, Portugal
| | - Ricardo L. Pires
- 3B’s
Research Group−Biomaterials, Biodegradables and Biomimetics, University of Minho, Avepark−Zona Industrial da Gandra, 4806-017 Barco GMR, Portugal
- ICVS/3B’s−PT
Government Associate Laboratory, University of Minho, Braga/Guimarães, Portugal
| | - Lívia Santos
- 3B’s
Research Group−Biomaterials, Biodegradables and Biomimetics, University of Minho, Avepark−Zona Industrial da Gandra, 4806-017 Barco GMR, Portugal
- ICVS/3B’s−PT
Government Associate Laboratory, University of Minho, Braga/Guimarães, Portugal
| | - Albina Franco
- 3B’s
Research Group−Biomaterials, Biodegradables and Biomimetics, University of Minho, Avepark−Zona Industrial da Gandra, 4806-017 Barco GMR, Portugal
- ICVS/3B’s−PT
Government Associate Laboratory, University of Minho, Braga/Guimarães, Portugal
| | - Fernando Rodrigues
- ICVS/3B’s−PT
Government Associate Laboratory, University of Minho, Braga/Guimarães, Portugal
- Life
and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, Braga 4710-057, Portugal
| | - Isabel Leonor
- 3B’s
Research Group−Biomaterials, Biodegradables and Biomimetics, University of Minho, Avepark−Zona Industrial da Gandra, 4806-017 Barco GMR, Portugal
- ICVS/3B’s−PT
Government Associate Laboratory, University of Minho, Braga/Guimarães, Portugal
| | - Rui L. Reis
- 3B’s
Research Group−Biomaterials, Biodegradables and Biomimetics, University of Minho, Avepark−Zona Industrial da Gandra, 4806-017 Barco GMR, Portugal
- ICVS/3B’s−PT
Government Associate Laboratory, University of Minho, Braga/Guimarães, Portugal
| | - Manuela E. Gomes
- 3B’s
Research Group−Biomaterials, Biodegradables and Biomimetics, University of Minho, Avepark−Zona Industrial da Gandra, 4806-017 Barco GMR, Portugal
- ICVS/3B’s−PT
Government Associate Laboratory, University of Minho, Braga/Guimarães, Portugal
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22
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Babo PS, Reis RL, Gomes ME. Periodontal tissue engineering: current strategies and the role of platelet rich hemoderivatives. J Mater Chem B 2017; 5:3617-3628. [DOI: 10.1039/c7tb00010c] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Periodontal tissue engineering procures to regenerate the periodontal tissue assuring the right combination of scaffolds, biochemical cues and cells. The platelet rich hemoderivatives might provide the adequate growth factors and structural proteins for the predictable regeneration of periodontium.
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Affiliation(s)
- Pedro S. Babo
- 3B's Research Group – Biomaterials
- Biodegradables and Biomimetics
- University of Minho
- Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine
- 4805-017 Barco GMR
| | - Rui L. Reis
- 3B's Research Group – Biomaterials
- Biodegradables and Biomimetics
- University of Minho
- Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine
- 4805-017 Barco GMR
| | - Manuela E. Gomes
- 3B's Research Group – Biomaterials
- Biodegradables and Biomimetics
- University of Minho
- Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine
- 4805-017 Barco GMR
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23
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Cameron DR, Jiang JH, Kostoulias X, Foxwell DJ, Peleg AY. Vancomycin susceptibility in methicillin-resistant Staphylococcus aureus is mediated by YycHI activation of the WalRK essential two-component regulatory system. Sci Rep 2016; 6:30823. [PMID: 27600558 PMCID: PMC5013275 DOI: 10.1038/srep30823] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Accepted: 06/09/2016] [Indexed: 02/01/2023] Open
Abstract
The treatment of infections caused by methicillin-resistant Staphylococcus aureus is complicated by the emergence of strains with intermediate-level resistance to vancomycin (termed VISA). We have characterised a molecular pathway involved in the in vivo evolution of VISA mediated by the regulatory proteins YycH and YycI. In contrast to their function in other bacterial species, we report a positive role for these auxiliary proteins in regulation of the two-component regulator WalRK. Transcriptional profiling of yycH and yycI deletion mutants revealed downregulation of the ‘WalRK regulon’ including cell wall hydrolase genes atlA and sle1, with functional autolysis assays supporting these data by showing an impaired autolytic phenotype for each deletion strain. Using bacterial-two hybrid assays, we showed that YycH and YycI interact, and that YycHI also interacts with the sensor kinase WalK, forming a ternary protein complex. Mutation to YycH or YycI associated with clinical VISA strains had a deleterious impact on the YycHI/WalK complex, suggesting that the interaction is important for the regulation of WalRK. Taken together, we have described a novel antibiotic resistance strategy for the human pathogen S. aureus, whereby YycHI mutations are selected for in vivo leading to reduced WalRK activation, impaired cell wall turnover and ultimately reduced vancomycin efficacy.
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Affiliation(s)
- David R Cameron
- Department of Microbiology, Monash University, Melbourne, Australia
| | - Jhih-Hang Jiang
- Department of Microbiology, Monash University, Melbourne, Australia
| | - Xenia Kostoulias
- Department of Microbiology, Monash University, Melbourne, Australia
| | - Daniel J Foxwell
- Department of Microbiology, Monash University, Melbourne, Australia
| | - Anton Y Peleg
- Department of Microbiology, Monash University, Melbourne, Australia.,Department of Infectious Diseases, Alfred Hospital and Monash University, Melbourne, Australia
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24
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Abstract
Rho GTPases are critical for platelet function. Although the roles of RhoA, Rac and Cdc42 are characterized, platelets express other Rho GTPases, whose activities are less well understood. This review summarizes our understanding of the roles of platelet Rho GTPases and focuses particularly on the functions of Rif and RhoG. In human platelets, Rif interacts with cytoskeleton regulators including formins mDia1 and mDia3, whereas RhoG binds SNARE-complex proteins and cytoskeletal regulators ELMO and DOCK1. Knockout mouse studies suggest that Rif plays no critical functions in platelets, likely due to functional overlap with other Rho GTPases. In contrast, RhoG is essential for normal granule secretion downstream of the collagen receptor GPVI. The central defect in RhoG-/- platelets is reduced dense granule secretion, which impedes integrin activation and aggregation and limits platelet recruitment to growing thrombi under shear, translating into reduced thrombus formation in vivo. Potential avenues for future work on Rho GTPases in platelets are also highlighted, including identification of the key regulator for platelet filopodia formation and investigation of the role of the many Rho GTPase regulators in platelet function in both health and disease.
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25
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Abstract
OBJECTIVES Streptococcus pneumoniae is the most common causative pathogen in community-acquired pneumonia. In patients, thrombocytopenia is correlated with an adverse outcome of pneumonia. Platelets can modulate the host response to infection in several ways, that is, by facilitating clot formation, production of antimicrobial proteins, and interaction with neutrophils. We studied the effect of thrombocytopenia during murine pneumococcal pneumonia. DESIGN Animal study. SETTING University research laboratory. SUBJECTS Mice. INTERVENTIONS Pneumonia was induced by intranasal inoculation of S. pneumoniae. Platelets were depleted by anti-mouse thrombocyte serum; controls received nonimmunogenic serum. In separate studies, mice were treated with the platelet P2Y12 receptor inhibitor clopidogrel or placebo. MEASUREMENTS AND MAIN RESULTS Thrombocytopenic mice (platelet counts < 1% of uninfected controls) showed a reduced survival during pneumococcal pneumonia (27% vs 75% among controls; p = 0.003), which was associated with higher bacterial loads in lungs, spleen, and blood. Thrombocytopenic mice showed enhanced coagulation activation (thrombin-antithrombin complexes) in plasma. Proinflammatory cytokine levels were higher in plasma but not in lungs of thrombocytopenic mice. Although clopidogrel treatment strongly prolonged the bleeding time, it did not impact on bacterial loads during pneumococcal pneumonia. CONCLUSIONS Platelets play a protective role during pneumococcal pneumonia independent of their aggregation.
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Ferdous F, Scott T. A comparative examination of thrombocyte/platelet immunity. Immunol Lett 2015; 163:32-9. [DOI: 10.1016/j.imlet.2014.11.010] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Revised: 10/30/2014] [Accepted: 11/12/2014] [Indexed: 10/24/2022]
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Platelet activation by Streptococcus pyogenes leads to entrapment in platelet aggregates, from which bacteria subsequently escape. Infect Immun 2014; 82:4307-14. [PMID: 25069984 DOI: 10.1128/iai.02020-14] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Platelet activation and aggregation have been reported to occur in response to a number of Gram-positive pathogens. Here, we show that platelet aggregates induced by Streptococcus pyogenes were unstable and that viable bacteria escaped from the aggregates over time. This was not due to differential activation in response to the bacteria compared with physiological activators. All the bacterial isolates induced significant platelet activation, including integrin activation and alpha and dense-granule release, at levels equivalent to those induced by potent physiological platelet activators that induced stable aggregates. The ability to escape the aggregates and to resist the antibacterial effects of platelets was dependent on active protein synthesis by the bacteria within the aggregate. We conclude that S. pyogenes bacteria can temporarily cover themselves with activated platelets, and we propose that this may facilitate survival of the bacteria in the presence of platelets.
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Bódis J, Papp S, Vermes I, Sulyok E, Tamás P, Farkas B, Zámbó K, Hatzipetros I, Kovács GL. "Platelet-associated regulatory system (PARS)" with particular reference to female reproduction. J Ovarian Res 2014; 7:55. [PMID: 24883111 PMCID: PMC4039651 DOI: 10.1186/1757-2215-7-55] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2014] [Accepted: 04/21/2014] [Indexed: 02/06/2023] Open
Abstract
Background Blood platelets play an essential role in hemostasis, thrombosis and coagulation of blood. Beyond these classic functions their involvement in inflammatory, neoplastic and immune processes was also investigated. It is well known, that platelets have an armament of soluble molecules, factors, mediators, chemokines, cytokines and neurotransmitters in their granules, and have multiple adhesion molecules and receptors on their surface. Methods Selected relevant literature and own views and experiences as clinical observations have been used. Results Considering that platelets are indispensable in numerous homeostatic endocrine functions, it is reasonable to suppose that a platelet-associated regulatory system (PARS) may exist; internal or external triggers and/or stimuli may complement and connect regulatory pathways aimed towards target tissues and/or cells. The signal (PAF, or other tissue/cell specific factors) comes from the stimulated (by the e.g., hypophyseal hormones, bacteria, external factors, etc.) organs or cells, and activates platelets. Platelet activation means their aggregation, sludge formation, furthermore the release of the for-mentioned biologically very powerful factors, which can locally amplify and deepen the tissue specific cell reactions. If this process is impaired or inhibited for any reason, the specifically stimulated organ shows hypofunction. When PARS is upregulated, organ hyperfunction may occur that culminate in severe diseases. Conclusion Based on clinical and experimental evidences we propose that platelets modulate the function of hypothalamo-hypophyseal-ovarian system. Specifically, hypothalamic GnRH releases FSH from the anterior pituitary, which induces and stimulates follicular and oocyte maturation and steroid hormone secretion in the ovary. At the same time follicular cells enhance PAF production. Through these pathways activated platelets are accumulated in the follicular vessels surrounding the follicle and due to its released soluble molecules (factors, mediators, chemokines, cytokines, neurotransmitters) locally increase oocyte maturation and hormone secretion. Therefore we suggest that platelets are not only a small participant but may be the conductor or active mediator of this complex regulatory system which has several unrevealed mechanisms. In other words platelets are corpuscular messengers, or are more than a member of the family providing hemostasis.
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Affiliation(s)
- József Bódis
- Department of Obstetrics and Gynecology, University of Pécs, 7624 Pécs Édesanyák útja 17, Hungary ; HAS-UP Human reproduction scientific research group, 7624 Pécs Édesanyák útja 17, Hungary
| | - Szilárd Papp
- Department of Obstetrics and Gynecology, University of Pécs, 7624 Pécs Édesanyák útja 17, Hungary
| | - István Vermes
- Institiute of Diagnostics, Faculty of Health Sciences, University of Pécs, 7400 Kaposvár, Szent Imre u. 14/b, Hungary
| | - Endre Sulyok
- Faculty of Health Sciences, University of Pécs, 7621 Pécs Vörösmarty u. 4, Hungary
| | - Péter Tamás
- Department of Obstetrics and Gynecology, University of Pécs, 7624 Pécs Édesanyák útja 17, Hungary
| | - Bálint Farkas
- Department of Obstetrics and Gynecology, University of Pécs, 7624 Pécs Édesanyák útja 17, Hungary
| | - Katalin Zámbó
- Department of Nuclear Medicine, University of Pécs, 7624 Pécs Ifjúság u. 13, Hungary
| | - Ioannis Hatzipetros
- Department of Obstetrics and Gynecology, University of Pécs, 7624 Pécs Édesanyák útja 17, Hungary
| | - Gábor L Kovács
- Department of Laboratory Medicine, University of Pécs, 7624 Pécs Ifjúság u. 13, Hungary ; Szentagothai Research Centre, University of Pécs, 7624 Pécs, Ifjúsag u. 20., Hungary
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Ginsburg I, Koren E. Are cationic antimicrobial peptides also ‘double-edged swords’? Expert Rev Anti Infect Ther 2014; 6:453-62. [DOI: 10.1586/14787210.6.4.453] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Borst EM, Ständker L, Wagner K, Schulz TF, Forssmann WG, Messerle M. A peptide inhibitor of cytomegalovirus infection from human hemofiltrate. Antimicrob Agents Chemother 2013; 57:4751-60. [PMID: 23856778 PMCID: PMC3811406 DOI: 10.1128/aac.00854-13] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2013] [Accepted: 07/10/2013] [Indexed: 12/18/2022] Open
Abstract
Naturally occurring substances with antimicrobial activity can serve as a starting point for the rational design of new drugs to treat infectious diseases. Here, we screened a library of peptides derived from human hemofiltrate for inhibitory effects on human cytomegalovirus (CMV) infection. We isolated a previously unknown derivative of the neutrophil-activating peptide 2, which we termed CYVIP, for CMV-inhibiting peptide. The peptide blocked infection with human and mouse CMV as well as with herpes simplex virus type 1 in different cell types. We found that CYVIP interferes with virus attachment to the cell surface, and structure-activity relationship studies revealed that positively charged lysine and arginine residues of CYVIP are essential for its inhibitory activity. The N-terminal 29 amino acids of the peptide were sufficient for inhibition, and substitution with an acidic residue further improved its activity. The target structure of CYVIP on the cell surface seems to be the sulfate residues of heparan sulfate proteoglycans, which are known to serve as herpesvirus attachment receptors. Our data suggest that O-sulfation of heparan sulfate is required for binding of CYVIP, and furthermore, that the initial interaction of CMV particles with cells takes place preferentially via 6-O-linked sulfate groups. These findings about CYVIP's mode of action lay the basis for further development of antivirals interfering with attachment of CMV to cells, a crucial step of the infection cycle.
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Affiliation(s)
| | - Ludger Ständker
- Center of Pharmacology and Clinic of Immunology, Research Group of Peptide Chemistry
| | | | - Thomas F. Schulz
- Department of Virology
- German Centre for Infection Research, Hannover Medical School, Hannover, Germany
| | - Wolf-Georg Forssmann
- Center of Pharmacology and Clinic of Immunology, Research Group of Peptide Chemistry
| | - Martin Messerle
- Department of Virology
- German Centre for Infection Research, Hannover Medical School, Hannover, Germany
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Bosch-Marcé M, Mohan KV, Gelderman MP, Ryan PL, Russek-Cohen E, Atreya CD. Preclinical safety evaluation of human platelets treated with antimicrobial peptides in severe combined immunodeficient mice. Transfusion 2013; 54:569-76. [DOI: 10.1111/trf.12318] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2013] [Revised: 05/08/2013] [Accepted: 05/13/2013] [Indexed: 11/27/2022]
Affiliation(s)
- Marta Bosch-Marcé
- Section of Cell Biology, Laboratory of Cellular Hematology, Division of Hematology; Food and Drug Administration; Bethesda Maryland
- Division of Biostatistics, Center for Biologics Evaluation and Research; Food and Drug Administration; Bethesda Maryland
| | - Ketha V.K. Mohan
- Section of Cell Biology, Laboratory of Cellular Hematology, Division of Hematology; Food and Drug Administration; Bethesda Maryland
- Division of Biostatistics, Center for Biologics Evaluation and Research; Food and Drug Administration; Bethesda Maryland
| | - Monique P. Gelderman
- Section of Cell Biology, Laboratory of Cellular Hematology, Division of Hematology; Food and Drug Administration; Bethesda Maryland
- Division of Biostatistics, Center for Biologics Evaluation and Research; Food and Drug Administration; Bethesda Maryland
| | - Patricia L. Ryan
- Section of Cell Biology, Laboratory of Cellular Hematology, Division of Hematology; Food and Drug Administration; Bethesda Maryland
- Division of Biostatistics, Center for Biologics Evaluation and Research; Food and Drug Administration; Bethesda Maryland
| | - Estelle Russek-Cohen
- Section of Cell Biology, Laboratory of Cellular Hematology, Division of Hematology; Food and Drug Administration; Bethesda Maryland
- Division of Biostatistics, Center for Biologics Evaluation and Research; Food and Drug Administration; Bethesda Maryland
| | - Chintamani D. Atreya
- Section of Cell Biology, Laboratory of Cellular Hematology, Division of Hematology; Food and Drug Administration; Bethesda Maryland
- Division of Biostatistics, Center for Biologics Evaluation and Research; Food and Drug Administration; Bethesda Maryland
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32
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Platelet factor 4 binding to lipid A of Gram-negative bacteria exposes PF4/heparin-like epitopes. Blood 2012; 120:3345-52. [DOI: 10.1182/blood-2012-06-434985] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
AbstractThe positively charged chemokine platelet factor 4 (PF4) forms immunogenic complexes with heparin and other polyanions. Resulting antibodies can induce the adverse drug effect heparin-induced thrombocytopenia. PF4 also binds to bacteria, thereby exposing the same neoantigen(s) as with heparin. In this study, we identified the negatively charged lipopolysaccharide (LPS) as the PF4 binding structure on Gram-negative bacteria. We demonstrate by flow cytometry that mutant bacteria with progressively truncated LPS structures show increasingly enhanced PF4 binding activity. PF4 bound strongest to mutants lacking the O-antigen and core structure of LPS, but still exposing lipid A on their surfaces. Strikingly, PF4 bound more efficiently to bisphosphorylated lipid A than to monophosphorylated lipid A, suggesting that phosphate residues of lipid A mediate PF4 binding. Interactions of PF4 with Gram-negative bacteria, where only the lipid A part of LPS is exposed, induce epitopes on PF4 resembling those on PF4/heparin complexes as shown by binding of human anti-PF4/heparin antibodies. As both the lipid A on the surface of Gram-negative bacteria and the amino acids of PF4 contributing to polyanion binding are highly conserved, our results further support the hypothesis that neoepitope formation on PF4 after binding to bacteria is an ancient host defense mechanism.
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Fan J, Zhang Y, Chuang-Smith ON, Frank KL, Guenther BD, Kern M, Schlievert PM, Herzberg MC. Ecto-5'-nucleotidase: a candidate virulence factor in Streptococcus sanguinis experimental endocarditis. PLoS One 2012; 7:e38059. [PMID: 22685551 PMCID: PMC3369921 DOI: 10.1371/journal.pone.0038059] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2011] [Accepted: 05/02/2012] [Indexed: 11/18/2022] Open
Abstract
Streptococcus sanguinis is the most common cause of infective endocarditis (IE). Since the molecular basis of virulence of this oral commensal bacterium remains unclear, we searched the genome of S. sanguinis for previously unidentified virulence factors. We identified a cell surface ecto-5′-nucleotidase (Nt5e), as a candidate virulence factor. By colorimetric phosphate assay, we showed that S. sanguinis Nt5e can hydrolyze extracellular adenosine triphosphate to generate adenosine. Moreover, a nt5e deletion mutant showed significantly shorter lag time (P<0.05) to onset of platelet aggregation than the wild-type strain, without affecting platelet-bacterial adhesion in vitro (P = 0.98). In the absence of nt5e, S. sanguinis caused IE (4 d) in a rabbit model with significantly decreased mass of vegetations (P<0.01) and recovered bacterial loads (log10CFU, P = 0.01), suggesting that Nt5e contributes to the virulence of S. sanguinis in vivo. As a virulence factor, Nt5e may function by (i) hydrolyzing ATP, a pro-inflammatory molecule, and generating adenosine, an immunosuppressive molecule to inhibit phagocytic monocytes/macrophages associated with valvular vegetations. (ii) Nt5e-mediated inhibition of platelet aggregation could also delay presentation of platelet microbicidal proteins to infecting bacteria on heart valves. Both plausible Nt5e-dependent mechanisms would promote survival of infecting S. sanguinis. In conclusion, we now show for the first time that streptococcal Nt5e modulates S. sanguinis-induced platelet aggregation and may contribute to the virulence of streptococci in experimental IE.
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Affiliation(s)
- Jingyuan Fan
- Department of Diagnostic and Biological Sciences, School of Dentistry, University of Minnesota, Minneapolis, Minnesota, United States of America
| | - Yongshu Zhang
- Department of Diagnostic and Biological Sciences, School of Dentistry, University of Minnesota, Minneapolis, Minnesota, United States of America
| | - Olivia N. Chuang-Smith
- Department of Microbiology, University of Minnesota Medical School, Minneapolis, Minnesota, United States of America
| | - Kristi L. Frank
- Department of Microbiology, University of Minnesota Medical School, Minneapolis, Minnesota, United States of America
| | - Brian D. Guenther
- Department of Diagnostic and Biological Sciences, School of Dentistry, University of Minnesota, Minneapolis, Minnesota, United States of America
| | - Marissa Kern
- Department of Diagnostic and Biological Sciences, School of Dentistry, University of Minnesota, Minneapolis, Minnesota, United States of America
| | - Patrick M. Schlievert
- Department of Microbiology, University of Minnesota Medical School, Minneapolis, Minnesota, United States of America
| | - Mark C. Herzberg
- Department of Diagnostic and Biological Sciences, School of Dentistry, University of Minnesota, Minneapolis, Minnesota, United States of America
- Mucosal and Vaccine Research Center, Minneapolis Veterans Affairs Medical Center, Minneapolis, Minnesota, United States of America
- * E-mail:
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Horn M, Bertling A, Brodde MF, Müller A, Roth J, Van Aken H, Jurk K, Heilmann C, Peters G, Kehrel BE. Human neutrophil alpha-defensins induce formation of fibrinogen and thrombospondin-1 amyloid-like structures and activate platelets via glycoprotein IIb/IIIa. J Thromb Haemost 2012; 10:647-61. [PMID: 22268819 DOI: 10.1111/j.1538-7836.2012.04640.x] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
BACKGROUND Human neutrophil α-defensins (HNPs) are important constituents of the innate immune system. Beyond their antimicrobial properties, HNPs also have pro-inflammatory features. While HNPs in plasma from healthy individuals are barely detectable, their level is strongly elevated in septic plasma and plasma from patients with acute coronary syndromes. OBJECTIVES As thrombosis and inflammation are intertwined processes and activation of human polymorphonuclear leukocytes (PMNL) and subsequent degranulation is associated with full activation of surrounding platelets, we studied the effect of HNPs on platelet function. METHODS The effect of HNPs on platelet activation parameters and apoptosis was investigated via aggregometry, flow cytometry, confocal microscopy and the ELISA technique. RESULTS It was found that HNPs activate platelets in pathophysiologically relevant doses, inducing fibrinogen and thrombospondin-1 binding, aggregation, granule secretion, sCD40L shedding, and procoagulant activity. HNPs bound directly to the platelet membrane, induced membrane pore formation, microparticle formation, mitochondrial membrane depolarization and caspase-3-activity. Confocal microscopy revealed the HNP-induced formation of polymeric fibrinogen and thrombospondin-1 amyloid-like structures, which bound microorganisms. Platelets adhered to these structures and formed aggregates. Blocking of glycoprotein IIb/IIIa (GPIIb/IIIa) markedly inhibited HNP-induced platelet activation. In addition, heparin, heparinoid, serpins and α(2)-macroglobulin, which all bind to HNPs, blocked HNP-1-induced platelet activation in contrast to direct thrombin inhibitors such as hirudin. CONCLUSIONS HNPs activate platelets and induce platelet apoptosis by formation of amyloid-like proteins. As these structures entrapped bacteria and fungi, they might reflect an additional function of HNPs in host defense. The described mechanism links again thrombosis and infection.
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Affiliation(s)
- M Horn
- Department of Anaesthesiology and Intensive Care, Experimental and Clinical Haemostasis, University of Muenster, Muenster, Germany
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Yeaman MR. Bacterial-platelet interactions: virulence meets host defense. Future Microbiol 2010; 5:471-506. [PMID: 20210555 DOI: 10.2217/fmb.09.112] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Platelets have historically been viewed as cell fragments that only mediate blood coagulation. Yet, platelets have as - or perhaps even more - important roles in tissue remodeling, modulation of inflammation and antimicrobial host defense. It is evident that platelets interact with prokaryotes directly and indirectly through multiple molecular and cellular mechanisms. The important roles of platelets in antibacterial host defense can be exemplified through contemporary themes in platelet immunobiology. Platelets have unambiguous structures and functions of host defense effector cells. Recent discoveries reveal platelet expression of toll-like and purinonergic receptors, which enable detection and response to bacterial infection, degranulation of an array of microbicidal peptides and coordination of other molecular and cellular host defenses. From multiple perspectives, platelets are now increasingly recognized as critical innate immune effector cells that also bridge and facilitate optimization of adaptive immunity. It follows that clinical deficiencies in platelet quantity or quality are now recognized correlates of increased risk and severity of bacterial and other infections. Along these lines, new evidence suggests that certain prokaryotic organisms may be capable of exploiting platelet interactions to gain a virulence advantage. Indeed, certain bacterial pathogens appear to have evolved highly coordinated means by which to seize opportunities to bind to surfaces of activated platelets, and exploit them to establish or propagate infection. Hence, it is conceivable that certain bacterial pathogens subvert platelet functions. From these perspectives, the net consequences of bacterial virulence versus platelet host defenses likely decide initial steps towards the ultimate result of infection versus immunity.
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Affiliation(s)
- Michael R Yeaman
- Department of Medicine, David Geffen School of Medicine at UCLA, Harbor-UCLA Medical Center, 1124 West Carson Street, RB-2, Torrance, CA 90502, USA.
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36
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Mohan KVK, Rao SS, Atreya CD. Antiviral activity of selected antimicrobial peptides against vaccinia virus. Antiviral Res 2010; 86:306-11. [PMID: 20347875 PMCID: PMC7114312 DOI: 10.1016/j.antiviral.2010.03.012] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2010] [Revised: 03/05/2010] [Accepted: 03/23/2010] [Indexed: 01/28/2023]
Abstract
Antimicrobial peptides (AMPs) are gaining importance as effective therapeutic alternatives to conventional antibiotics. Recently we have shown that a set of nine synthetic antimicrobial peptides, four originating from thrombin-induced human platelet-derived antimicrobial proteins named PD1-PD4 and five synthetic repeats of arginine-tryptophan (RW) repeats (RW1-5) demonstrate antibacterial activity in plasma and platelets. Using WR strain of vaccinia virus (VV) as a model virus for enveloped virus in the present study, we tested the same nine synthetic peptides for their antiviral activity. A cell culture-based standard plaque reduction assay was utilized to estimate antiviral effectiveness of the peptides. Our analysis revealed that peptides PD3, PD4, and RW3 were virucidal against VV with PD3 demonstrating the highest antiviral activity of 100-fold reduction in viral titers, whereas, PD4 and RW3 peptide treatments resulted in 10-30-fold reduction. The EC(50) values of PD3, PD4 and RW3 were found to be 40 microg/ml, 50 microg/ml and 6.5 microM, respectively. In VV-spiked plasma samples, the virucidal activity of PD3, PD4 and RW3 was close to 100% (90-100-fold reduction). Overall, the present study constitutes a new proof-of-concept in developing peptide therapeutics for vaccinia virus infections in biothreat scenarios and as in vitro viral reduction agents.
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Affiliation(s)
- Ketha V K Mohan
- Section of Cell Biology, Laboratory of Cellular Hematology, Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, MD 20892, USA.
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Abstract
Platelets interact with bacterial pathogens through a wide array of cellular and molecular mechanisms. The consequences of this interaction may significantly influence the balance between infection and immunity. On the one hand, recent data indicate that certain bacteria may be capable of exploiting these interactions to gain a virulence advantage. Indeed, certain bacterial pathogens appear to have evolved specific ways in which to subvert activated platelets. Hence, it is conceivable that some bacterial pathogens exploit platelet responses. On the other hand, platelets are now known to possess unambiguous structures and functions of host defense effector cells. Recent discoveries emphasize critical features enabling such functions, including expression of toll-like receptors that detect hallmark signals of bacterial infection, an array of microbicidal peptides, as well as other host defense molecules and functions. These concepts are consistent with increased risk and severity of bacterial infection as correlates of clinical abnormalities in platelet quantity and quality. In these respects, the molecular and cellular roles of platelets in host defense against bacterial pathogens are explored with attention on advances in platelet immunobiology.
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Affiliation(s)
- Michael R Yeaman
- Division of Infectious Diseases, St. John's Cardiovascular Research Center, Harbor-UCLA Medical Center, David Geffen School of Medicine at UCLA, Torrance, CA 90502, USA.
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Mohan KVK, Rao SS, Atreya CD. Evaluation of antimicrobial peptides as novel bactericidal agents for room temperature-stored platelets. Transfusion 2010; 50:166-73. [PMID: 19761549 DOI: 10.1111/j.1537-2995.2009.02376.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND A single cost-effective pathogen inactivation approach would help to improve the safety of our nation's blood supply. Several methods and technologies are currently being studied to help reduce bacterial contamination of blood components. There is clearly need for simple and easy-to-use pathogen inactivation techniques specific to plasma, platelets (PLTs), and red blood cells. STUDY DESIGN AND METHODS In this report, we introduce a novel proof of concept: using known therapeutic antimicrobial peptides (AMPs) as bactericidal agents for room temperature-stored PLT concentrates (PCs). Nine synthetic AMPs, four from PLT microbicidal protein-derived peptides (PD1-4) and five Arg-Trp (RW) repeat peptides containing one to five repeats, were tested for bactericidal activity in plasma and PC samples spiked with Staphylococcus aureus, S. epidermidis, Escherichia coli, Pseudomonas aeruginosa, Klebsiella pneumoniae, and Bacillus cereus. A 3-log reduction of viable bacteria was considered as the bactericidal activity of a given peptide. RESULTS In both plasma alone and PCs, RW3 peptide demonstrated bactericidal activity against S. aureus, S. epidermidis, E. coli, P. aeruginosa, and K. pneumoniae; PD4 and RW2 against P. aeruginosa; and RW4 against K. pneumoniae. The activity of each of these four peptides against the remaining bacterial species in the test panel resulted in less than a 3-log reduction in the number of viable bacteria and hence considered ineffective. CONCLUSIONS These findings suggest a new approach to improving the safety of blood components, demonstrating the potential usefulness of screening therapeutic AMPs against selected bacteria to identify suitable bactericidal agents for stored plasma, PCs, and other blood products.
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Affiliation(s)
- Ketha V K Mohan
- Section of Cell Biology, Laboratory of Cellular Hematology, Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, Maryland, USA
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Zhu Y, Xiong YQ, Sadykov MR, Fey PD, Lei MG, Lee CY, Bayer AS, Somerville GA. Tricarboxylic acid cycle-dependent attenuation of Staphylococcus aureus in vivo virulence by selective inhibition of amino acid transport. Infect Immun 2009; 77:4256-64. [PMID: 19667045 PMCID: PMC2747957 DOI: 10.1128/iai.00195-09] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Staphylococci are the leading causes of endovascular infections worldwide. Commonly, these infections involve the formation of biofilms on the surface of biomaterials. Biofilms are a complex aggregation of bacteria commonly encapsulated by an adhesive exopolysaccharide matrix. In staphylococci, this exopolysaccharide matrix is composed of polysaccharide intercellular adhesin (PIA). PIA is synthesized when the tricarboxylic acid (TCA) cycle is repressed. The inverse correlation between PIA synthesis and TCA cycle activity led us to hypothesize that increasing TCA cycle activity would decrease PIA synthesis and biofilm formation and reduce virulence in a rabbit catheter-induced model of biofilm infection. TCA cycle activity can be induced by preventing staphylococci from exogenously acquiring a TCA cycle-derived amino acid necessary for growth. To determine if TCA cycle induction would decrease PIA synthesis in Staphylococcus aureus, the glutamine permease gene (glnP) was inactivated and TCA cycle activity, PIA accumulation, biofilm forming ability, and virulence in an experimental catheter-induced endovascular biofilm (endocarditis) model were determined. Inactivation of this major glutamine transporter increased TCA cycle activity, transiently decreased PIA synthesis, and significantly reduced in vivo virulence in the endocarditis model in terms of achievable bacterial densities in biofilm-associated cardiac vegetations, kidneys, and spleen. These data confirm the close linkage of TCA cycle activity and virulence factor production and establish that this metabolic linkage can be manipulated to alter infectious outcomes.
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Affiliation(s)
- Yefei Zhu
- Department of Veterinary and Biomedical Sciences, University of Nebraska, 155 VBS, Fair St. and East Campus Loop, Lincoln, NE 68583-0905, USA
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Bourbigot S, Dodd E, Horwood C, Cumby N, Fardy L, Welch WH, Ramjan Z, Sharma S, Waring AJ, Yeaman MR, Booth V. Antimicrobial peptide RP-1 structure and interactions with anionic versus zwitterionic micelles. Biopolymers 2009; 91:1-13. [PMID: 18712851 DOI: 10.1002/bip.21071] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Topologically, platelet factor-4 kinocidins consist of distinct N-terminal extended, C-terminal helical, and interposing gamma-core structural domains. The C-terminal alpha-helices autonomously confer direct microbicidal activity, and the synthetic antimicrobial peptide RP-1 is modeled upon these domains. In this study, the structure of RP-1 was assessed using several complementary techniques. The high-resolution structure of RP-1 was determined by NMR in anionic sodium dodecyl sulfate (SDS) and zwitterionic dodecylphosphocholine (DPC) micelles, which approximate prokaryotic and eukaryotic membranes, respectively. NMR data indicate the peptide assumes an amphipathic alpha-helical backbone conformation in both micelle environments. However, small differences were observed in the side-chain orientations of lysine, tyrosine, and phenylalanine residues in SDS versus DPC environments. NMR experiments with a paramagnetic probe indicated differences in positioning of the peptide within the two micelle types. Molecular dynamics (MD) simulations of the peptide in both micelle types were also performed to add insight into the peptide/micelle interactions and to assess the validity of this technique to predict the structure of peptides in complex with micelles. MD independently predicted RP-1 to interact only peripherally with the DPC micelle, leaving its spherical shape intact. In contrast, RP-1 entered deeply into and significantly distorted the SDS micelle. Overall, the experimental and MD results support a preferential specificity of RP-1 for anionic membranes over zwitterionic membranes. This specificity likely derives from differences in RP-1 interaction with distinct lipid systems, including subtle differences in side chain orientations, rather than gross changes in RP-1 structure in the two lipid environments.
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Affiliation(s)
- Sarah Bourbigot
- Department of Biochemistry, Memorial University of Newfoundland, St. John's, Newfoundland A1B 3X9, Canada
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41
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Howden BP, Smith DJ, Mansell A, Johnson PDR, Ward PB, Stinear TP, Davies JK. Different bacterial gene expression patterns and attenuated host immune responses are associated with the evolution of low-level vancomycin resistance during persistent methicillin-resistant Staphylococcus aureus bacteraemia. BMC Microbiol 2008; 8:39. [PMID: 18304359 PMCID: PMC2289824 DOI: 10.1186/1471-2180-8-39] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2007] [Accepted: 02/27/2008] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND Low-level vancomycin resistance in Staphylococcus aureus (vancomycin-intermediate S. aureus (VISA) and hetero-VISA [hVISA]) emerges during persistent infection and failed vancomycin therapy. Up-regulation of genes associated with the "cell wall stimulon" and mutations in the vraSR operon have both been implicated in the development of resistance, however the molecular mechanisms of resistance are not completely understood. To further elucidate the mechanisms leading to resistance transcriptome comparisons were performed using multiple clinical pairs of vancomycin-susceptible S. aureus (VSSA) and hVISA/VISA (n = 5), and three VSSA control pairs from hospitalized patients with persistent bacteraemia that did not develop hVISA/VISA. Based on the transcriptome results multiple genes were sequenced and innate immune system stimulation was assessed in the VSSA and hVISA/VISA pairs. RESULTS Here we show that up-regulation of vraS and the "cell wall stimulon" is not essential for acquisition of low-level vancomycin resistance and that different transcriptional responses occur, even between closely related hVISA/VISA strains. DNA sequencing of vraSR, saeSR, mgrA, rot, and merR regulatory genes and upstream regions did not reveal any differences between VSSA and hVISA/VISA despite transcriptional changes suggesting mutations in these loci may be linked to resistance in these strains. Enhanced capsule production and reduced protein A expression in hVISA/VISA were confirmed by independent bioassays and fully supported the transcriptome data. None of these changes were observed in the three control pairs that remained vancomycin-susceptible during persistent bacteremia. In a macrophage model of infection the changes in cell surface structures in hVISA/VISA strains were associated with significantly reduced NF-kappaB activation resulting in reduced TNF-alpha and IL-1beta expression. CONCLUSION We conclude that there are multiple pathways to low-level vancomycin resistance in S. aureus, even among closely related clinical strains, and these can result in an attenuated host immune response. The persistent infections associated with hVISA/VISA strains may be a consequence of changes in host pathogen interactions in addition to the reduced antibiotic susceptibility.
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Affiliation(s)
- Benjamin P Howden
- Australian Bacterial Pathogenesis Program, Department of Microbiology, Monash University, Clayton, Victoria, Australia.
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42
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Abstract
Beyond an eminent role in hemostasis and thrombosis, platelets are characterized by expert functions in assisting and modulating inflammatory reactions and immune responses. This is achieved by the regulated expression of adhesive and immune receptors on the platelet surface and by the release of a multitude of secretory products including inflammatory mediators and cytokines, which can mediate the interaction with leukocytes and enhance their recruitment. In addition, platelets are characterized by an enormous surface area and open canalicular system, which in concert with specialized recognition receptors may contribute to the engulfment of serum components, antigens, and pathogens. Platelet-dependent increases in leukocyte adhesion may not only account for an exacerbation of atherosclerosis, for arterial repair processes, but also for lymphocyte trafficking during adaptive immunity and host defense. This review compiles a selection of platelet-derived tools for bridging inflammation and vascular disease and highlights the molecular key components governing platelet-mediated mechanisms operative in immune surveillance, vascular remodeling, and atherosclerosis.
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Affiliation(s)
- Philipp von Hundelshausen
- Institute of Cardiovascular Molecular Research, University Hospital of the Rheinisch-Westfälische Technische Hochschule, Aachen, Germany
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43
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Stickney DR, Dowding C, Authier S, Garsd A, Onizuka-Handa N, Reading C, Frincke JM. 5-androstenediol improves survival in clinically unsupported rhesus monkeys with radiation-induced myelosuppression. Int Immunopharmacol 2007; 7:500-5. [PMID: 17321473 DOI: 10.1016/j.intimp.2006.12.005] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2006] [Revised: 12/12/2006] [Accepted: 12/13/2006] [Indexed: 01/31/2023]
Abstract
We previously reported that five daily intramuscular doses of 5-androstenediol (AED), a naturally occurring adrenal steroid hormone, stimulated multilineage recovery of bone marrow in rhesus monkeys with radiation-induced myelosuppression after 4.0 Gy total body irradiation (TBI). Here we report the effect of AED on the survival of eighty rhesus macaques that received a 6.0 Gy dose of TBI in four sequential pilot studies. The drug was administered intramuscularly, based on body weight, 2-4 h after irradiation and continued once daily for a total of five injections. No clinical support in the form of antibiotics or transfusions was given to the animals at any time during the study. Five of the 40 (12.5%) treated animals died, compared to 13 of 40 (32.5%) of the animals in the control group (p=0.032). The combination of accumulated days of thrombocytopenia (<20,000 platelets/microL) up to day 14 (before the first death) together with treatment, accurately predicts mortality (p<0.001). The compound significantly reduced the duration of thrombocytopenia and neutropenia (p<0.01). The accumulation of days of neutropenia (ANC<500 cells/microL) up to day 14 plays no major role in predicting death. AED shows significant activity in irradiated primates with acute hematopoietic radiation syndrome.
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44
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Antimicrobial Host Defense. Platelets 2007. [DOI: 10.1016/b978-012369367-9/50802-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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45
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Abstract
It has been estimated that there are more microorganisms within and upon the human body than there are human cells. By necessity, every accessible niche must be defended by innate mechanisms to prevent invasive infection, and ideally that precludes the need for robust inflammatory responses. Yet the potential for pathogens to transcend the integument actively or passively and access the bloodstream emphasizes the need for rapid and potent antimicrobial defense mechanisms within the vascular compartment. Antimicrobial peptides from leukocytes have long been contemplated as being integral to defense against these infections. Recently, platelets are increasingly recognized for their likely multiple roles in antimicrobial host defense. Platelets and leukocytes share many structural and functional archetypes. Once activated, both cell types respond in specific ways that emphasize key roles for their antimicrobial peptides in host defense efficacy: (a) targeted accumulation at sites of tissue injury or infection; (b) direct interaction with pathogens; and (c) deployment of intracellular (leukocyte phagosomes) or extracellular (platelet secretion) antimicrobial peptides. Antimicrobial peptides from these cells exert rapid, potent, and direct antimicrobial effects against organisms that commonly access the bloodstream. Experimental models in vitro and in vivo show that antimicrobial peptides from these cells significantly contribute to prevent or limit infection. Moreover, certain platelet antimicrobial proteins are multifunctional kinocidins (microbicidal chemokines) that recruit leukocytes to sites of infection, and potentiate the antimicrobial mechanisms of these cells. In turn, pathogens pre-decorated by kinocidins may be more efficiently phagocytosed and killed by leukocytes and their antimicrobial peptide arsenal. Hence, multiple and relevant interactions between platelets and leukocytes have immunologic functions yet to be fully understood. A clearer definition of these interactions, and the antimicrobial peptide effectors contributing to these functions, will significantly advance our understanding of antimicrobial host defense against invasive infection. In addition, this knowledge may accelerate development of novel anti-infective agents and strategies against pathogens that have become refractory to conventional antimicrobials.
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Affiliation(s)
- M R Yeaman
- Division of Infectious Diseases, David Geffen School of Medicine at UCLA, LAC-Harbor UCLA Medical Center, Torrance 90502, USA.
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46
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Xiong YQ, Bayer AS, Elazegui L, Yeaman MR. A synthetic congener modeled on a microbicidal domain of thrombin- induced platelet microbicidal protein 1 recapitulates staphylocidal mechanisms of the native molecule. Antimicrob Agents Chemother 2006; 50:3786-92. [PMID: 16954324 PMCID: PMC1635186 DOI: 10.1128/aac.00038-06] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Thrombin-induced platelet microbicidal protein 1 (tPMP-1) is a staphylocidal peptide released by activated platelets. This peptide initiates its microbicidal activity by membrane permeabilization, with ensuing inhibition of intracellular macromolecular synthesis. RP-1 is a synthetic congener modeled on the C-terminal microbicidal alpha-helix of tPMP-1. This study compared the staphylocidal mechanisms of RP-1 with those of tPMP-1, focusing on isogenic tPMP-1-susceptible (ISP479C) and -resistant (ISP479R) Staphylococcus aureus strains for the following quantitative evaluations: staphylocidal efficacy; comparative MIC; membrane permeabilization (MP) and depolarization; and DNA, RNA, and protein synthesis. Although the proteins had similar MICs, RP-1 caused significant killing of ISP479C (<50% survival), correlating with extensive MP (>95%) and inhibition of DNA and RNA synthesis (>90%), versus substantially reduced killing of ISP479R (>80% survival), with less MP (55%) and less inhibition of DNA or RNA synthesis (70 to 80%). Interestingly, RP-1-induced protein synthesis inhibition was equivalent in both strains. RP-1 did not depolarize the cell membrane and caused a relatively short postexposure growth inhibition. These data closely parallel those previously reported for tPMP-1 against this strain set and exemplify how synthetic molecules can be engineered to reflect structure-activity relationships of functional domains in native host defense effector molecules.
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Affiliation(s)
- Yan Q Xiong
- Department of Medicine, Division of Infectious Diseases, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, 1124 West Carson Street, RB-2, Room 231, Torrance, CA 90502, USA.
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Abstract
In recent years, the frequency of serious cardiovascular infections such as endocarditis has increased, particularly in association with nosocomially acquired antibiotic-resistant pathogens. Growing evidence suggests a crucial role for the interaction of bacteria with human platelets in the pathogenesis of cardiovascular infections. Here, we review the nature of the interactions between platelets and bacteria, and the role of these interactions in the pathogenesis of endocarditis and other cardiovascular diseases.
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Affiliation(s)
- J Ross Fitzgerald
- Centre for Infectious Diseases, The Chancellor's Building, New Royal Infirmary, University of Edinburgh, Edinburgh EH16 4SB, Scotland, UK
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48
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Yount NY, Gank KD, Xiong YQ, Bayer AS, Pender T, Welch WH, Yeaman MR. Platelet microbicidal protein 1: structural themes of a multifunctional antimicrobial peptide. Antimicrob Agents Chemother 2004; 48:4395-404. [PMID: 15504869 PMCID: PMC525416 DOI: 10.1128/aac.48.11.4395-4404.2004] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2004] [Revised: 04/01/2004] [Accepted: 06/14/2004] [Indexed: 11/20/2022] Open
Abstract
Mammalian platelets release platelet microbicidal proteins (PMPs) as components of their antimicrobial armamentarium. The present studies defined the structure of PMP-1 and examined its structure-activity relationships. Amino acid sequencing and mass spectroscopy demonstrated that distinct N-terminal polymorphism variants of PMP-1 isolated from nonstimulated or thrombin-stimulated platelets arise from a single PMP-1 propeptide. Sequence data (NH(2)-[S]D(1)DPKE(5)SEGDL(10)HCVCV(15)KTTSL(20) . . .) enabled cloning of PMP-1 from bone marrow and characterization of its full-length cDNA. PMP-1 is translated as a 106-amino-acid precursor and is processed to yield 73-residue (8,053 Da) and 72-residue (7,951-Da) variants. Searches with the BLAST program and sequence alignments demonstrated the homology of PMP-1 to members of the mammalian platelet factor 4 (PF-4) family of proteins. On the basis of phylogenetic relatedness, congruent sequence motifs, and predicted three-dimensional structures, PMP-1 shares the greatest homology with human PF-4 (hPF-4). By integration of its structural and antimicrobial properties, these results establish the identity of PMP-1 as a novel rabbit analogue of the microbicidal chemokine (kinocidin) hPF-4. These findings advance the hypothesis that stimuli in the setting of infection prompt platelets to release PF-4-class or related kinocidins, which have structures consistent with their likely multiple roles that bridge molecular and cellular mechanisms of antimicrobial host defense.
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Affiliation(s)
- Nannette Y Yount
- David Geffen School of Medicine at UCLA, Division of Infectious Diseases, St. John's Cardiovascular Research Center, Research & Education Institute at Harbor-UCLA Medical Center, Torrance, CA 90502, USA
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49
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Yeaman MR, Cheng D, Desai B, Kupferwasser LI, Xiong YQ, Gank KD, Edwards JE, Bayer AS. Susceptibility to thrombin-induced platelet microbicidal protein is associated with increased fluconazole efficacy against experimental endocarditis due to Candida albicans. Antimicrob Agents Chemother 2004; 48:3051-6. [PMID: 15273120 PMCID: PMC478484 DOI: 10.1128/aac.48.8.3051-3056.2004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Platelet microbicidal proteins (PMPs) are believed to be integral to host defense against endovascular infection. We previously demonstrated that susceptibility to thrombin-induced PMP 1 (tPMP-1) in vitro negatively influences Candida albicans virulence in the rabbit model of infective endocarditis (IE). This study evaluated the relationship between in vitro tPMP-1 susceptibility (tPMP-1s) or resistance (tPMP-1r) and efficacy of fluconazole (FLU) therapy of IE due to C. albicans. Candida IE was established in rabbits with either tPMP-1s or tPMP-1r strains. Treatment groups received FLU (100 mg/kg/day) intraperitoneally for 7 or 14 days; control animals received no therapy. At these time points, cardiac vegetations, kidneys, and spleens were quantitatively cultured to assess fungal burden. At both 7 and 14 days and in all target tissues, the extent of candidal clearance by FLU was greater in animals infected with the tPMP-1s strain than in those infected with the tPMP-1r strain. These differences were statistically significant in the spleen and kidney. Corroborating these in vivo data, FLU (a candidastatic agent), in combination with tPMP-1, exerted an enhanced fungicidal effect in vitro against tPMP-1s and tPMP-1r C. albicans, with the extent of this effect greatest against the tPMP-1s strain. Collectively, these results support the concept that tPMP-1 susceptibility contributes to the net efficacy of FLU against C. albicans IE in vivo, particularly in tissues in which platelets and tPMP-1 likely play significant roles in host defense.
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Affiliation(s)
- Michael R Yeaman
- Division of Infectious Diseases, St. John's Cardiovascular Research Center, Harbor-UCLA Research and Education Institute, Torrance, California 90502, USA.
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50
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Schaffner A, King CC, Schaer D, Guiney DG. Induction and antimicrobial activity of platelet basic protein derivatives in human monocytes. J Leukoc Biol 2004; 76:1010-8. [PMID: 15316029 DOI: 10.1189/jlb.0404261] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
The antimicrobial activity of a number of chemokines has recently come into focus of research about innate immunity. We have previously shown that platelet basic protein (PBP), which gives rise to several antimicrobial peptides of platelets, is also expressed in human monocytes. In the present studies, we show that exposure of human monocytes to bacteria or microbial components (lipopolysaccharide and zymosan) induces a several-fold greater expression of derivates of PBP. Also, activation of proteinase-activated receptors (PARs) by thrombin or the synthetic peptide ligand SFLLRN of PAR-1 significantly increased PBP expression, presumably on the transcriptional level, as evidenced by higher mRNA levels. Derivates of PBP appeared to reach phago-lysosomes, as higher concentration was found in latex phagosomes isolated by a flotation method. By the gel-overlay technique, two bactericidal derivatives of PBP could be visualized, which were immunoreactive with anti-PBP antibody in Western blots. By matrix-assisted laser desorption/ionization time of flight and surface-enhanced laser desorption and ionization techniques, it was confirmed that the bands corresponded to PBP derivates. After immunofixation with a monoclonal antibody to PBP, the major peptide in zymosan-stimulated monocytes was identified to correspond by molecular weight to connective tissue-activating peptide III, which has been reported to be a major antimicrobial PBP derivate also in platelets. Our observations indicate that PBP and its derivates are constituents of the antimicrobial arsenal of human monocytes. Their increased expression after exposure to microorganisms allows a rapid host response to pathogens.
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Affiliation(s)
- Andreas Schaffner
- Division of Infectious Diseases, University of California San Diego, USA.
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