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Elsayed HE, Ayoub IM, Mady MS, Moharram FA. Chemical and biological characterization of Melaleuca subulata (Cheel) Craven leaves' volatile constituents supported by chemometric analysis and molecular docking. BMC Complement Med Ther 2024; 24:76. [PMID: 38317130 PMCID: PMC10840179 DOI: 10.1186/s12906-024-04345-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Accepted: 01/10/2024] [Indexed: 02/07/2024] Open
Abstract
BACKGROUND The genus Melaleuca (Myrtaceae) comprises dozens of essential oil (EO)-rich species that are appreciated worldwide for their various medicinal values. Additionally, they are renowned in traditional medicine for their antimicrobial, antifungal, and other skin-related activities. The current study investigated the chemical profile and skin-related activities of volatile constituents derived from M. subulata (Cheel) Craven (Synonym Callistemon subulatus) leaves cultivated in Egypt for the first time. METHODS The volatile components were extracted using hydrodistillation (HD), headspace (HS), and supercritical fluid (SF). GC/MS and Kovat's retention indices were implemented to identify the volatile compounds, while the variations among the components were assessed using Principal Component Analysis and Hierarchical Cluster Analysis. The radical scavenging activity was assessed using 2,2-diphenyl-1-picrylhydrazyl (DPPH), oxygen radical absorbance capacity (ORAC) and β-carotene assays. Moreover, the anti-aging effect was evaluated using anti-elastase, and anti-collagenase, while the antimicrobial potential was deduced from the agar diffusion and broth microdilution assays. Lastly, the molecular docking study was executed using C-docker protocol in Discovery Studio 4.5 to rationalize the binding affinity with targeted enzymes. RESULTS The SF extraction approach offered the highest EO yield, being 0.75%. According to the GC/MS analysis, monoterpene hydrocarbons were the most abundant volatile class in the HD oil sample (54.95%), with α-pinene being the most copious component (35.17%). On the contrary, the HS and SF volatile constituents were pioneered with oxygenated monoterpenes (72.01 and 36.41%) with eucalyptol and isopulegone being the most recognized components, representing 67.75 and 23.46%, respectively. The chemometric analysis showed segregate clustering of the three extraction methods with α-pinene, eucalyptol, and isopulegone serving as the main discriminating phytomarkers. Concerning the bioactivity context, both SF and HD-EOs exhibited antioxidant effects in terms of ORAC and β-carotene bleaching. The HD-EO displayed potent anti-tyrosinase activity, whereas the SF-EO exhibited significant anti-elastase properties. Moreover, SF-EO shows selective activity against gram-positive skin pathogens, especially S. aureus. Ultimately, molecular docking revealed binding scores for the volatile constituents; analogous to those of the docked reference drugs. CONCLUSIONS M. subulata leaves constitute bioactive volatile components that may be indorsed as bioactive hits for managing skin aging and infection, though further in vivo studies are recommended.
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Affiliation(s)
- Heba E Elsayed
- Department of Pharmacognosy, Faculty of Pharmacy, Helwan University, Cairo, 11795, Egypt.
| | - Iriny M Ayoub
- Department of Pharmacognosy, Faculty of Pharmacy, Ain Shams University, Cairo, 11566, Egypt
| | - Mohamed S Mady
- Department of Pharmacognosy, Faculty of Pharmacy, Helwan University, Cairo, 11795, Egypt
| | - Fatma A Moharram
- Department of Pharmacognosy, Faculty of Pharmacy, Helwan University, Cairo, 11795, Egypt
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Chiang-Ni C, Chiang CY, Chen YW, Shi YA, Chao YT, Wang S, Tsai PJ, Chiu CH. RopB-regulated SpeB cysteine protease degrades extracellular vesicles-associated streptolysin O and bacterial proteins from group A Streptococcus. Virulence 2023; 14:2249784. [PMID: 37621107 PMCID: PMC10461520 DOI: 10.1080/21505594.2023.2249784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 07/31/2023] [Accepted: 08/13/2023] [Indexed: 08/26/2023] Open
Abstract
Extracellular vesicles (EVs) can be released from gram-positive bacteria and would participate in the delivery of bacterial toxins. Streptococcus pyogenes (group A Streptococcus, GAS) is one of the most common pathogens of monomicrobial necrotizing fasciitis. Spontaneous inactivating mutation in the CovR/CovS two-component regulatory system is related to the increase of EVs production via an unknown mechanism. This study aimed to investigate whether the CovR/CovS-regulated RopB, the transcriptional regulator of GAS exoproteins, would participate in regulating EVs production. Results showed that the size, morphology, and number of EVs released from the wild-type strain and the ropB mutant were similar, suggesting RopB is not involved in controlling EVs production. Nonetheless, RopB-regulated SpeB protease degrades streptolysin O and bacterial proteins in EVs. Although SpeB has crucial roles in modulating protein composition in EVs, the SpeB-positive EVs failed to trigger HaCaT keratinocytes pyroptosis, suggesting that EVs did not deliver SpeB into keratinocytes or the amount of SpeB in EVs was not sufficient to trigger cell pyroptosis. Finally, we identified that EV-associated enolase was resistant to SpeB degradation, and therefore could be utilized as the internal control protein for verifying SLO degradation. This study revealed that RopB would participate in modulating protein composition in EVs via SpeB-dependent protein degradation and suggested that enolase is a potential internal marker for studying GAS EVs.
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Affiliation(s)
- Chuan Chiang-Ni
- Department of Microbiology and Immunology, College of Medicine, Chang Gung University, Taoyuan, Taiwan
- Graduate Institute of Biomedical Sciences, College of Medicine, Chang Gung University, Taoyuan, Taiwan
- Molecular Infectious Disease Research Center, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan
- Department of Orthopedic Surgery, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan
| | - Chien-Yi Chiang
- Graduate Institute of Biomedical Sciences, College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Yan-Wen Chen
- Department of Microbiology and Immunology, College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Yong-An Shi
- Graduate Institute of Biomedical Sciences, College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Yu-Tzu Chao
- Department of Microbiology and Immunology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Shuying Wang
- Department of Microbiology and Immunology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
- Center of Infectious Disease and Signaling Research, National Cheng Kung University, Tainan, Taiwan
| | - Pei-Jane Tsai
- Center of Infectious Disease and Signaling Research, National Cheng Kung University, Tainan, Taiwan
- Department of Medical Laboratory Science and Biotechnology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Cheng-Hsun Chiu
- Graduate Institute of Biomedical Sciences, College of Medicine, Chang Gung University, Taoyuan, Taiwan
- Molecular Infectious Disease Research Center, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan
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Frick IM, Happonen L, Wrighton S, Nordenfelt P, Björck L. IdeS, a secreted proteinase of Streptococcus pyogenes, is bound to a nuclease at the bacterial surface where it inactivates opsonizing IgG antibodies. J Biol Chem 2023; 299:105345. [PMID: 37838172 PMCID: PMC10654033 DOI: 10.1016/j.jbc.2023.105345] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 09/25/2023] [Accepted: 10/04/2023] [Indexed: 10/16/2023] Open
Abstract
The important bacterial pathogen Streptococcus pyogenes secretes IdeS (immunoglobulin G-degrading enzyme of S. pyogenes), a proteinase that cleaves human immunoglobulin G (IgG) antibodies in the hinge region resulting in Fc (fragment crystallizable) and F(ab')2 (fragment antigen-binding) fragments and protects the bacteria against phagocytic killing. Experiments with radiolabeled IdeS and flow cytometry demonstrated that IdeS binds to the surface of S. pyogenes, and the interaction was most prominent in conditions resembling those in the pharynx (acidic pH and low salt), the habitat for S. pyogenes. SpnA (S. pyogenes nuclease A) is a cell wall-anchored DNase. A dose-dependent interaction between purified SpnA and IdeS was demonstrated in slot binding and surface plasmon resonance spectroscopy experiments. Gel filtration showed that IdeS forms proteolytically active complexes with SpnA in solution, and super-resolution fluorescence microscopy revealed the presence of SpnA-IdeS complexes at the surface of S. pyogenes. Finally, specific IgG antibodies binding to S. pyogenes surface antigens were efficiently cleaved by surface-associated IdeS. IdeS is secreted by all S. pyogenes isolates and cleaves IgG antibodies with a unique degree of specificity and efficiency. These properties and the finding here that the proteinase is present and fully active at the bacterial surface in complex with SpnA implicate an important role for IdeS in S. pyogenes biology and pathogenesis.
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Affiliation(s)
- Inga-Maria Frick
- Division of Infection Medicine, Department of Clinical Science, Lund University, Lund, Sweden.
| | - Lotta Happonen
- Division of Infection Medicine, Department of Clinical Science, Lund University, Lund, Sweden
| | - Sebastian Wrighton
- Division of Infection Medicine, Department of Clinical Science, Lund University, Lund, Sweden
| | - Pontus Nordenfelt
- Division of Infection Medicine, Department of Clinical Science, Lund University, Lund, Sweden
| | - Lars Björck
- Division of Infection Medicine, Department of Clinical Science, Lund University, Lund, Sweden.
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Gedi V, Duarte F, Patel P, Bhattacharjee P, Tecza M, McGourty K, Hudson SP. Impact of Propeptide Cleavage on the Stability and Activity of a Streptococcal Immunomodulatory C5a Peptidase for Biopharmaceutical Development. Mol Pharm 2023; 20:4041-4049. [PMID: 37406301 PMCID: PMC10410607 DOI: 10.1021/acs.molpharmaceut.3c00207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 06/18/2023] [Accepted: 06/20/2023] [Indexed: 07/07/2023]
Abstract
Posttranslational modifications of proteins can impact their therapeutic efficacy, stability, and potential for pharmaceutical development. The Group AStreptococcus pyogenesC5a peptidase (ScpA) is a multi-domain protein composed of an N-terminal signal peptide, a catalytic domain (including propeptide), three fibronectin domains, and cell membrane-associated domains. It is one of several proteins produced by Group AS. pyogenesknown to cleave components of the human complement system. After signal peptide removal, ScpA undergoes autoproteolysis and cleaves its propeptide for full maturation. The exact location and mechanism of the propeptide cleavage, and the impact of this cleavage on stability and activity, are not clearly understood, and the exact primary sequence of the final enzyme is not known. A form of ScpA with no autoproteolysis fragments of propeptide present may be more desirable for pharmaceutical development from a regulatory and a biocompatibility in the body perspective. The current study describes an in-depth structural and functional characterization of propeptide truncated variants of ScpA expressed inEscherichia colicells. All three purified ScpA variants, ScpA, 79ΔPro, and 92ΔPro, starting with N32, D79, and A92 positions, respectively, showed similar activity against C5a, which suggests a propeptide-independent activity profile of ScpA. CE-SDS and MALDI top-down sequencing analyses highlight a time-dependent propeptide autoproteolysis of ScpA at 37 °C with a distinct end point at A92 and/or D93. In comparison, all three variants of ScpA exhibit similar stability, melting temperatures, and secondary structure orientation. In summary, this work not only highlights propeptide localization but also provides a strategy to recombinantly produce a final mature and active form of ScpA without any propeptide-related fragments.
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Affiliation(s)
- Vinayakumar Gedi
- Department
of Chemical Sciences, Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland
| | - Francisco Duarte
- Department
of Chemical Sciences, Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland
| | - Pratikkumar Patel
- Department
of Chemical Sciences, Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland
| | - Promita Bhattacharjee
- Department
of Chemical Sciences, Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland
| | - Malgorzata Tecza
- Department
of Chemical Sciences, Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland
| | - Kieran McGourty
- Department
of Chemical Sciences, Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland
- SSPC
SFI Research Centre for Pharmaceuticals, University of Limerick, Limerick V94 T9PX, Ireland
| | - Sarah P. Hudson
- Department
of Chemical Sciences, Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland
- SSPC
SFI Research Centre for Pharmaceuticals, University of Limerick, Limerick V94 T9PX, Ireland
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Plainvert C, Rosinski-Chupin I, Weckel A, Lambert C, Touak G, Sauvage E, Poyart C, Glaser P, Fouet A. A Novel CovS Variant Harbored by a Colonization Strain Reduces Streptococcus pyogenes Virulence. J Bacteriol 2023; 205:e0003923. [PMID: 36920220 PMCID: PMC10127592 DOI: 10.1128/jb.00039-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Accepted: 02/16/2023] [Indexed: 03/16/2023] Open
Abstract
Streptococcus pyogenes, also known as group A Streptococcus, causes a wide variety of diseases ranging from mild noninvasive to severe invasive infections. To identify possible causes of colonization-to-invasive switches, we determined the genomic sequences of 10 isolates from five pairs each composed of an invasive strain and a carriage strain originating from five infectious clusters. Among them, one pair displayed a single-nucleotide difference in covS, encoding the sensor histidine kinase of the two-component CovRS system that controls the expression of 15% of the genome. In contrast to previously described cases where the invasive strains harbor nonfunctional CovS proteins, the carriage strain possessed the mutation covST115C, leading to the replacement of the tyrosine at position 39 by a histidine. The CovSY39H mutation affected the expression of the genes from the CovR regulon in a unique fashion. Genes usually overexpressed in covS mutant strains were underexpressed and vice versa. Furthermore, the covS mutant strain barely responded to the addition of the CovS-signaling compounds Mg2+ and LL-37. The variations in the accumulation of two virulence factors paralleled the transcription modifications. In addition, the covST115C mutant strain showed less survival than its wild-type counterpart in murine macrophages. Finally, in two murine models of infection, the covS mutant strain was less virulent than the wild-type strain. Our study suggests that the CovSY39H protein compromises CovS phosphatase activity and that this yields a noninvasive strain. IMPORTANCE Streptococcus pyogenes, also known as group A Streptococcus, causes a wide variety of diseases, leading to 517,000 deaths yearly. The two-component CovRS system, which responds to MgCl2 and the antimicrobial peptide LL-37, controls the expression of 15% of the genome. Invasive strains may harbor nonfunctional CovS sensor proteins that lead to the derepression of most virulence genes. We isolated a colonization strain that harbors a novel covS mutation. This mutant strain harbored a transcriptome profile opposite that of other covS mutant strains, barely responded to environmental signals, and was less virulent than the wild-type strain. This supports the importance of the derepression of the expression of most virulence genes, via mutations that impact the phosphorylation of the regulator CovR, for favoring S. pyogenes invasive infections.
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Affiliation(s)
- Céline Plainvert
- Université Paris Cité, Institut Cochin, INSERM, U1016, CNRS, UMR8104, Paris, France
- Service de Bactériologie, CNR des Streptocoques, Hôpitaux Universitaires Paris Centre, Paris, France
| | - Isabelle Rosinski-Chupin
- Institut Pasteur, Ecologie et Evolution de la Résistance aux Antibiotiques, UMR3525, Paris, France
| | - Antonin Weckel
- Université Paris Cité, Institut Cochin, INSERM, U1016, CNRS, UMR8104, Paris, France
| | - Clara Lambert
- Université Paris Cité, Institut Cochin, INSERM, U1016, CNRS, UMR8104, Paris, France
| | - Gérald Touak
- Service de Bactériologie, CNR des Streptocoques, Hôpitaux Universitaires Paris Centre, Paris, France
| | - Elisabeth Sauvage
- Institut Pasteur, Ecologie et Evolution de la Résistance aux Antibiotiques, UMR3525, Paris, France
| | - Claire Poyart
- Université Paris Cité, Institut Cochin, INSERM, U1016, CNRS, UMR8104, Paris, France
- Service de Bactériologie, CNR des Streptocoques, Hôpitaux Universitaires Paris Centre, Paris, France
| | - Philippe Glaser
- Institut Pasteur, Ecologie et Evolution de la Résistance aux Antibiotiques, UMR3525, Paris, France
| | - Agnès Fouet
- Université Paris Cité, Institut Cochin, INSERM, U1016, CNRS, UMR8104, Paris, France
- Service de Bactériologie, CNR des Streptocoques, Hôpitaux Universitaires Paris Centre, Paris, France
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Alomair BM, Al-Kuraishy HM, Al-Gareeb AI, Al-Buhadily AK, Alexiou A, Papadakis M, Alshammari MA, Saad HM, Batiha GES. Mixed storm in SARS-CoV-2 infection: A narrative review and new term in the Covid-19 era. Immun Inflamm Dis 2023; 11:e838. [PMID: 37102645 PMCID: PMC10132185 DOI: 10.1002/iid3.838] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 03/22/2023] [Accepted: 03/27/2023] [Indexed: 04/28/2023] Open
Abstract
Coronavirus disease 2019 (Covid-19) is caused by a novel severe acute respiratory syndrome coronavirus virus type 2 (SARS-CoV-2) leading to the global pandemic worldwide. Systemic complications in Covid-19 are mainly related to the direct SARS-CoV-2 cytopathic effects, associated hyperinflammation, hypercytokinemia, and the development of cytokine storm (CS). As well, Covid-19 complications are developed due to the propagation of oxidative and thrombotic events which may progress to a severe state called oxidative storm and thrombotic storm (TS), respectively. In addition, inflammatory and lipid storms are also developed in Covid-19 due to the activation of inflammatory cells and the release of bioactive lipids correspondingly. Therefore, the present narrative review aimed to elucidate the interrelated relationship between different storm types in Covid-19 and the development of the mixed storm (MS). In conclusion, SARS-CoV-2 infection induces various storm types including CS, inflammatory storm, lipid storm, TS and oxidative storm. These storms are not developing alone since there is a close relationship between them. Therefore, the MS seems to be more appropriate to be related to severe Covid-19 than CS, since it develops in Covid-19 due to the intricate interface between reactive oxygen species, proinflammatory cytokines, complement activation, coagulation disorders, and activated inflammatory signaling pathway.
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Affiliation(s)
- Basil Mohammed Alomair
- Department of Medicine, College of Medicine, Internal Medicine and Endocrinology, Jouf University, Al-Jouf, Saudi Arabia
| | - Hayder M Al-Kuraishy
- Department of Clinical Pharmacology and Medicine, College of Medicine, Al-Mustansiriya University, Baghdad, Iraq
| | - Ali I Al-Gareeb
- Department of Clinical Pharmacology and Medicine, College of Medicine, Al-Mustansiriya University, Baghdad, Iraq
| | - Ali K Al-Buhadily
- Department of Clinical Pharmacology, Medicine, and Therapeutic, Medical Faculty, College of Medicine, Al-Mustansiriyah University, Baghdad, Iraq
| | - Athanasios Alexiou
- Department of Science and Engineering, Novel Global Community Educational Foundation, Hebersham, New South Wales, Australia
- AFNP Med, Wien, Austria
| | - Marios Papadakis
- Department of Surgery II, University Hospital Witten-Herdecke, University of Witten-Herdecke, Wuppertal, Germany
| | - Majed Ayed Alshammari
- Department of Medicine, Prince Mohammed Bin Abdulaziz Medical City, Sakaka, Al-Jouf, Saudi Arabia
| | - Hebatallah M Saad
- Department of Pathology, Faculty of Veterinary Medicine, Matrouh University, Marsa, Matruh, Egypt
| | - Gaber El-Saber Batiha
- Department of Pharmacology and Therapeutics, Faculty of Veterinary Medicine, Damanhour University, Damanhour, Egypt
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Hua C, Urbina T, Bosc R, Parks T, Sriskandan S, de Prost N, Chosidow O. Necrotising soft-tissue infections. THE LANCET. INFECTIOUS DISEASES 2023; 23:e81-e94. [PMID: 36252579 DOI: 10.1016/s1473-3099(22)00583-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Revised: 08/05/2022] [Accepted: 08/22/2022] [Indexed: 11/07/2022]
Abstract
The incidence of necrotising soft-tissue infections has increased during recent decades such that most physicians might see at least one case of these potentially life-threatening infections in their career. Despite advances in care, necrotising soft-tissue infections are still associated with high morbidity and mortality, underlining a need for continued education of the medical community. In particular, failure to suspect necrotising soft-tissue infections, fuelled by poor awareness of the disease, promotes delays to first surgical debridement, amplifying disease severity and adverse outcomes. This Review will focus on practical approaches to management of necrotising soft-tissue infections including prompt recognition, initiation of specific management, exploratory surgery, and aftercare. Increased alertness and awareness for these infections should improve time to diagnosis and early referral to specialised centres, with improvement in the prognosis of necrotising soft-tissue infections.
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Affiliation(s)
- Camille Hua
- Service de Dermatologie, Assistance Publique-Hôpitaux de Paris, Créteil, France; Hôpitaux Universitaires Henri Mondor, Assistance Publique-Hôpitaux de Paris, Créteil, France; Epidemiology in Dermatology and Evaluation of Therapeutics, Université Paris Est Créteil, Créteil, France; Groupe Infectiologie Dermatologique-Infections Sexuellement Transmissibles, Société Française de Dermatologie, Paris, France
| | - Tomas Urbina
- Service de Médecine Intensive Réanimation, Hôpital Saint-Antoine, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - Romain Bosc
- Service de Chirurgie Plastique, Assistance Publique-Hôpitaux de Paris, Créteil, France
| | - Tom Parks
- Department of Infectious Diseases, Imperial College London, London, UK
| | - Shiranee Sriskandan
- Department of Infectious Diseases, Imperial College London, London, UK; MRC Centre for Molecular Bacteriology and Infection, Imperial College London, London, UK
| | - Nicolas de Prost
- Service de Médecine Intensive Réanimation, Assistance Publique-Hôpitaux de Paris, Créteil, France; CARMAS Research Group, UPEC-Université Paris-Est Créteil Val de Marne, Faculté de médecine de Créteil, Créteil, France
| | - Olivier Chosidow
- Service de Dermatologie, Assistance Publique-Hôpitaux de Paris, Créteil, France; Hôpitaux Universitaires Henri Mondor, Assistance Publique-Hôpitaux de Paris, Créteil, France; Groupe Infectiologie Dermatologique-Infections Sexuellement Transmissibles, Société Française de Dermatologie, Paris, France; Research group Dynamyc, Faculté de Santé de Créteil, Ecole Nationale Vétérinaire d'Alfort, USC ANSES, Université Paris-Est Créteil, Créteil, France.
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National Surveillance of Tetracycline, Erythromycin, and Clindamycin Resistance in Invasive Streptococcus pyogenes: A Retrospective Study of the Situation in Spain, 2007-2020. Antibiotics (Basel) 2023; 12:antibiotics12010099. [PMID: 36671301 PMCID: PMC9854882 DOI: 10.3390/antibiotics12010099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 01/03/2023] [Accepted: 01/04/2023] [Indexed: 01/07/2023] Open
Abstract
BACKGROUND This work reports on antimicrobial resistance data for invasive Streptococcus pyogenes in Spain, collected by the 'Surveillance Program for Invasive Group A Streptococcus', in 2007-2020. METHODS emm typing was determined by sequencing. Susceptibility to penicillin, tetracycline, erythromycin, and clindamycin was determined via the E-test. tetM, tetO, msrD, mefA, ermB, ermTR, and ermT were sought by PCR. Macrolide-resistant phenotypes (M, cMLSB, and iMLSB) were detected using the erythromycin-clindamycin double-disk test. Resistant clones were identified via their emm type, multilocus sequence type (ST), resistance genotype, and macrolide resistance phenotype. RESULTS Penicillin susceptibility was universal. Tetracycline resistance was recorded for 237/1983 isolates (12.0%) (152 carried only tetM, 48 carried only tetO, and 33 carried both). Erythromycin resistance was detected in 172/1983 isolates (8.7%); ermB was present in 83, mefA in 58, msrD in 51, ermTR in 46, and ermT in 36. Clindamycin resistance (methylase-mediated) was present in 78/1983 isolates (3.9%). Eight main resistant clones were identified: two that were tetracycline-resistant only (emm22/ST46/tetM and emm77/ST63/tetO), three that were erythromycin-resistant only (emm4/ST39/mefA-msrD/M, emm12/ST36/mefA-msrD/M, and emm28/ST52/ermB/cMLSB), and three that were tetracycline-erythromycin co-resistant (emm11/ST403/tetM-ermB/cMLSB, emm77/ST63/tetO-ermTR/iMLSB, and emm77/ST63/tetM-tetO-ermTR/iMLSB). CONCLUSIONS Tetracycline, erythromycin, and clindamycin resistance rates declined between 2007 and 2020. Temporal variations in the proportion of resistant clones determined the change in resistance rates.
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Huang Y, Ju T, Zhang H, Cao D, Li X, Yang J, Yan D. Lower level of IL-28A as a predictive index of the artificial liver support system in effective treatment of patients with HBV-ACLF. J Clin Lab Anal 2022; 36:e24766. [PMID: 36336888 PMCID: PMC9756982 DOI: 10.1002/jcla.24766] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Revised: 10/23/2022] [Accepted: 10/27/2022] [Indexed: 11/27/2023] Open
Abstract
BACKGROUND HBV-related acute-on-chronic liver failure (HBV-ACLF) is the most common type of liver failure with high mortality. Artificial liver support system (ALSS) is an important mean to reduce the mortality of HBV-ACLF but lacking index to assess its effectiveness. The cytokines are closely related to the prognosis of HBV-ACLF patients with ALSS treatment, however, which is not fully understood. METHODS One hundred forty-two patients with HBV-ACLF and 25 healthy donors were enrolled. The cytokine profile of peripheral blood was determined in the patients before and after ALSS treatment, and their relationship with effectiveness of ALSS treatment in HBV-ACLF was analyzed. RESULTS Serum IL-28A levels were markedly lower in ALSS-effective patients than those in non-effective patients pre-ALSS treatment. Similarly, serum IL-6 was significantly lower in ALSS-effective patients. Furthermore, for patients with effective treatment, serum IL-28A levels were positively related with IL-6 levels post-ALSS (r = 0.2413, p = 0.0383). The ROC curve analysis showed that serum levels of IL-28A (AUC = 0.6959 when alone or 0.8795 when combined with total bilirubin, platelet count and INR, both p < 0.0001) and IL-6 (AUC = 0.6704, p = 0.0005) were useful indices for separating effective from non-effective ALSS treatment of HBV-ACLF patients. Multivariate logistic regression analysis demonstrated that lower level of IL-28A was independently associated with higher effective rate of ALSS treatments. CONCLUSIONS Lower level of IL-28A is a predictive biomarker for ALSS in effective treatment of HBV-ACLF patients and IL-28A may be potential target for the treatment of HBV-ACLF.
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Affiliation(s)
- Yandi Huang
- Department of Laboratory Medicine, the First Affiliated HospitalZhejiang University School of MedicineHangzhouChina
- Key Laboratory of Clinical In Vitro Diagnostic Techniques of Zhejiang ProvinceHangzhouChina
- Institute of Laboratory Medicine, Zhejiang UniversityHangzhouChina
| | - Tao Ju
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, the First Affiliated Hospital, Zhejiang University School of MedicineCollaborative Innovation Center for Diagnosis and Treatment of Infectious DiseasesHangzhouChina
| | - Huafen Zhang
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, the First Affiliated Hospital, Zhejiang University School of MedicineCollaborative Innovation Center for Diagnosis and Treatment of Infectious DiseasesHangzhouChina
| | - Dan Cao
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, the First Affiliated Hospital, Zhejiang University School of MedicineCollaborative Innovation Center for Diagnosis and Treatment of Infectious DiseasesHangzhouChina
| | - Xuefen Li
- Department of Laboratory Medicine, the First Affiliated HospitalZhejiang University School of MedicineHangzhouChina
- Key Laboratory of Clinical In Vitro Diagnostic Techniques of Zhejiang ProvinceHangzhouChina
- Institute of Laboratory Medicine, Zhejiang UniversityHangzhouChina
| | - Jiezuan Yang
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, the First Affiliated Hospital, Zhejiang University School of MedicineCollaborative Innovation Center for Diagnosis and Treatment of Infectious DiseasesHangzhouChina
| | - Dong Yan
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, the First Affiliated Hospital, Zhejiang University School of MedicineCollaborative Innovation Center for Diagnosis and Treatment of Infectious DiseasesHangzhouChina
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10
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Kirillova A, Lado A, Blatt N. Application of Monoclonal Antibody Drugs in Treatment of COVID-19: a Review. BIONANOSCIENCE 2022; 12:1436-1454. [PMID: 35729973 PMCID: PMC9198616 DOI: 10.1007/s12668-022-00997-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/30/2022] [Indexed: 01/08/2023]
Abstract
Coronavirus infection can have various degrees of severity and outcomes. In some cases, it causes excessive production of pro-inflammatory cytokines, a so-called cytokine storm, leading to acute respiratory distress syndrome. Unfortunately, the exact pathophysiology and treatment, especially for severe cases of COVID-19, are still uncertain. Results of preliminary studies showed that immunosuppressive therapy, such as interleukin (IL)-6, IL-1, and TNF-α antagonists commonly used in rheumatology, can be considered as treatment options for COVID-19, especially in severe cases. The review focused on the most common and currently studied monoclonal antibody drugs, as well as up-to-date data on the pathogenesis of COVID-19, host immune response against SARS-CoV-2 and its association with cytokine storm. It also covered effects of interleukin (IL)-6, IL-1, and TNF-α blockers on the course of coronavirus infection and outcome in patients treated for the main autoimmune disease and subsequently infected with COVID-19.
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Affiliation(s)
- Aleksandra Kirillova
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russian Federation
| | - Anna Lado
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russian Federation
| | - Nataliya Blatt
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan, Russian Federation
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11
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Zangrilli A, Diluvio L, Di Stadio A, Di Girolamo S. Improvement of Psoriasis Using Oral Probiotic Streptococcus salivarius K-12: a Case-Control 24-Month Longitudinal Study. Probiotics Antimicrob Proteins 2022; 14:573-578. [PMID: 35419648 PMCID: PMC9076720 DOI: 10.1007/s12602-022-09937-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/04/2022] [Indexed: 11/28/2022]
Abstract
Psoriasis is a common chronic skin disease, associated with an important physical and physiological involvement for any age. There is a strong link between psoriasis and streptococcal infection, particularly that of the tonsils. There are many therapies to treat psoriasis including topical, systemic, and biologic agents but these treatments are not free from side effects. Streptococcus salivarius K-12 is an oral probiotic product useful for the prophylaxis and treatment of tonsillar infections in children and adults, now tested here for the first time for control of psoriasis. Our retrospective analysis was conducted on 198 patients affected by mild to moderate psoriasis: 100 patients were first treated for 90 days with Streptococcus salivarius K-12, while 98 did not receive any probiotics and were the control group. The patients treated with S. salivarius K-12 exhibited a significant improvement of their psoriasis from the baseline condition: 83.7% patients treated achieved a 100% improvement of the PASI score at 24 weeks and efficacy continued to improve with longer treatment, maintaining same result also during follow-up observation. In all patients, the treatment was well tolerated, and no adverse events have been observed. Our data show that oral preparations containing Streptococcus salivarius may provide a beneficial option for the prevention and cure of pediatric and adult psoriasis.
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Affiliation(s)
- Arianna Zangrilli
- Dermatology, Department of Systems Medicine, University of Rome Tor Vergata, Viale Oxford, 8100133, Rome, Italy
| | - Laura Diluvio
- Department of Otorhinolaryngology, University of Rome Tor Vergata, Viale Oxford, 8100133, Rome, Italy
| | | | - Stefano Di Girolamo
- Department of Otorhinolaryngology, University of Rome Tor Vergata, Viale Oxford, 8100133, Rome, Italy
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12
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Takahashi R, Radcliff FJ, Proft T, Tsai CJ. Pilus proteins from
Streptococcus pyogenes
stimulate innate immune responses through Toll‐like receptor 2. Immunol Cell Biol 2022; 100:174-185. [PMID: 35124861 PMCID: PMC9303359 DOI: 10.1111/imcb.12523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 01/27/2022] [Accepted: 02/02/2022] [Indexed: 11/28/2022]
Abstract
The group A Streptococcus (GAS) pilus is a long, flexible, hair‐like structure anchored to the cell surface that facilitates the adherence of GAS to host cells, thus playing a critical role in initiating infections. Because of its important role in GAS virulence, the pilus has become an attractive target for vaccine development. While current research mainly focuses on pilus function and its potential as a vaccine component, there is a lack of knowledge on how the host immune system recognizes and responds to this abundant surface structure. Here we show that both assembled GAS pili and individual pilus proteins induce a potent release of the proinflammatory cytokines tumor necrosis factor and interleukin‐8. We further show that the surface‐exposed backbone pilin and ancillary pilin 1 subunits are Toll‐like receptor 2 (TLR2) agonists. Using reporter cell lines coexpressing human TLR2 in combination with either TLR1 or TLR6, we determined that activation was mediated by the TLR2/TLR6 heterodimer. Finally, we used solid‐phase and flow cytometry binding assays to illustrate a direct interaction between the pilus subunits and TLR2. These results provide further support for the suitability of the pilus as a vaccine component and opens potential avenues for using GAS pili as an adjuvant or immune‐modulation agent.
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Affiliation(s)
- Risa Takahashi
- Department of Molecular Medicine and Pathology, School of Medical Sciences The University of Auckland Auckland New Zealand
| | - Fiona J Radcliff
- Department of Molecular Medicine and Pathology, School of Medical Sciences The University of Auckland Auckland New Zealand
- Maurice Wilkins Centre for Biomolecular Discoveries The University of Auckland Auckland New Zealand
| | - Thomas Proft
- Department of Molecular Medicine and Pathology, School of Medical Sciences The University of Auckland Auckland New Zealand
- Maurice Wilkins Centre for Biomolecular Discoveries The University of Auckland Auckland New Zealand
| | - Catherine J‐Y Tsai
- Department of Molecular Medicine and Pathology, School of Medical Sciences The University of Auckland Auckland New Zealand
- Maurice Wilkins Centre for Biomolecular Discoveries The University of Auckland Auckland New Zealand
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13
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Liu Y, Kuang D, Li D, Yang J, Yan J, Xia Y, Zhang F, Cao H. Roles of the gut microbiota in severe SARS-CoV-2 infection. Cytokine Growth Factor Rev 2022; 63:98-107. [PMID: 35131164 PMCID: PMC8802135 DOI: 10.1016/j.cytogfr.2022.01.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 01/24/2022] [Accepted: 01/26/2022] [Indexed: 12/11/2022]
Abstract
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has spread worldwide. The pathophysiological mechanisms linking gut dysbiosis and severe SARS-CoV-2 infection are poorly understood, although gut microbiota disorders are related to severe SARS-CoV-2 infections. The roles of the gut microbiota in severe SARS-CoV-2 infection were compared with those in respiratory viral infection, which is an easily understood and enlightening analogy. Secondary bacterial infections caused by immune disorders and antibiotic abuse can lead to dysregulation of the gut microbiota in patients with respiratory viral infections. The gut microbiota can influence the progression of respiratory viral infections through metabolites and the immune response, which is known as the gut–lung axis. Angiotensin-converting enzyme 2 is expressed in both the lungs and the small intestine, which may be a bridge between the lung and the gut. Similarly, SARS-CoV-2 infection has been shown to disturb the gut microbiota, which may be the cause of cytokine storms. Bacteria in the gut, lung, and other tissues and respiratory viruses can be considered microecosystems and may exert overall effects on the host. By referencing respiratory viral infections, this review focused on the mechanisms involved in the interaction between SARS-CoV-2 infections and the gut microbiota and provides new strategies for the treatment or prevention of severe SARS-CoV-2 infections by improving gut microbial homeostasis.
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14
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Categorizing sequences of concern by function to better assess mechanisms of microbial pathogenesis. Infect Immun 2021; 90:e0033421. [PMID: 34780277 PMCID: PMC9119117 DOI: 10.1128/iai.00334-21] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
To identify sequences with a role in microbial pathogenesis, we assessed the adequacy of their annotation by existing controlled vocabularies and sequence databases. Our goal was to regularize descriptions of microbial pathogenesis for improved integration with bioinformatic applications. Here, we review the challenges of annotating sequences for pathogenic activity. We relate the categorization of more than 2,750 sequences of pathogenic microbes through a controlled vocabulary called Functions of Sequences of Concern (FunSoCs). These allow for an ease of description by both humans and machines. We provide a subset of 220 fully annotated sequences in the supplemental material as examples. The use of this compact (∼30 terms), controlled vocabulary has potential benefits for research in microbial genomics, public health, biosecurity, biosurveillance, and the characterization of new and emerging pathogens.
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15
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Yamaba Y, Takakuwa O, Ida C, Saito M, Kawae D, Yoshihara M, Kunii E, Imaeda K, Tatsuno I, Hasegawa T, Akita K. Streptococcal Toxic Shock Syndrome Induced by Group A Streptococcus with the emm28 Genotype That Developed after a Uterine Cancer Test. Intern Med 2021; 60:3481-3483. [PMID: 33994434 PMCID: PMC8627819 DOI: 10.2169/internalmedicine.6290-20] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
A 69-year-old woman without pre-existing disease visited our hospital due to general malaise, diarrhea, and arthralgia 3 days after a uterine cancer test. We diagnosed her with sepsis of unknown focus and started treatment immediately, but she died 20 hours after the first visit due to multi-organ failure and septic shock. Later, group A streptococcus was detected from the blood culture, and streptococcal toxic shock syndrome (STSS) was diagnosed. The strain had the emm28 genotype and a mutation in csrR with increased NADase activity. These virulence factors were considered to be related to STSS development in this patient.
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Affiliation(s)
- Yusuke Yamaba
- Department of Respiratory Medicine, Nagoya City University West Medical Center, Japan
| | - Osamu Takakuwa
- Department of Respiratory Medicine, Nagoya City University West Medical Center, Japan
- Department of Education and Research Center for Advanced Medicine, Nagoya City University Graduate School of Medical Sciences, Japan
| | - Chiaki Ida
- Nagoya City University Medical School, Japan
| | - Manami Saito
- Department of Respiratory Medicine, Nagoya City University West Medical Center, Japan
| | - Daisuke Kawae
- Department of Respiratory Medicine, Nagoya City University West Medical Center, Japan
| | - Misuzu Yoshihara
- Department of Respiratory Medicine, Nagoya City University West Medical Center, Japan
| | - Eiji Kunii
- Department of Respiratory Medicine, Nagoya City University West Medical Center, Japan
| | - Kenro Imaeda
- Department of Endocrinology and Diabetes, Nagoya City University West Medical Center, Japan
| | - Ichiro Tatsuno
- Department of Bacteriology, Nagoya City University Graduate School of Medical Science, Japan
| | - Tadao Hasegawa
- Department of Bacteriology, Nagoya City University Graduate School of Medical Science, Japan
| | - Kenji Akita
- Department of Respiratory Medicine, Nagoya City University West Medical Center, Japan
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16
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In Silico Core Proteomics and Molecular Docking Approaches for the Identification of Novel Inhibitors against Streptococcus pyogenes. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph182111355. [PMID: 34769873 PMCID: PMC8582943 DOI: 10.3390/ijerph182111355] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 10/06/2021] [Accepted: 10/09/2021] [Indexed: 12/18/2022]
Abstract
Streptococcus pyogenes is a significant pathogen that causes skin and upper respiratory tract infections and non-suppurative complications, such as acute rheumatic fever and post-strep glomerulonephritis. Multidrug resistance has emerged in S. pyogenes strains, making them more dangerous and pathogenic. Hence, it is necessary to identify and develop therapeutic methods that would present novel approaches to S. pyogenes infections. In the current study, a subtractive proteomics approach was employed to core proteomes of four strains of S. pyogenes using several bioinformatic software tools and servers. The core proteome consists of 1324 proteins, and 302 essential proteins were predicted from them. These essential proteins were analyzed using BLASTp against human proteome, and the number of potential targets was reduced to 145. Based on subcellular localization prediction, 46 proteins with cytoplasmic localization were chosen for metabolic pathway analysis. Only two cytoplasmic proteins, i.e., chromosomal replication initiator protein DnaA and two-component response regulator (TCR), were discovered to have the potential to be novel drug target candidates. Three-dimensional (3D) structure prediction of target proteins was carried out via the Swiss Model server. Molecular docking approach was employed to screen the library of 1000 phytochemicals against the interacting residues of the target proteins through the MOE software. Further, the docking studies were validated by running molecular dynamics simulation and highly popular binding free energy approaches of MM-GBSA and MM-PBSA. The findings revealed a promising candidate as a novel target against S. pyogenes infections.
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17
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COVID-19 Disease, Women's Predominant Non-Heparin Vaccine-Induced Thrombotic Thrombocytopenia and Kounis Syndrome: A Passepartout Cytokine Storm Interplay. Biomedicines 2021; 9:biomedicines9080959. [PMID: 34440163 PMCID: PMC8391920 DOI: 10.3390/biomedicines9080959] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 07/29/2021] [Accepted: 07/30/2021] [Indexed: 12/15/2022] Open
Abstract
Coronavirus disease 2019 (COVID-19) and severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) constitute one of the deadliest pandemics in modern history demonstrating cardiovascular, gastrointestinal, hematologic, mucocutaneous, respiratory, neurological, renal and testicular manifestations and further complications. COVID-19-induced excessive immune response accompanied with uncontrolled release of cytokines culminating in cytokine storm seem to be the common pathogenetic mechanism of these complications. The aim of this narrative review is to elucidate the relation between anaphylaxis associated with profound hypotension or hypoxemia with pro-inflammatory cytokine release. COVID-19 relation with Kounis syndrome and post-COVID-19 vaccination correlation with heparin-induced thrombocytopenia with thrombosis (HITT), especially serious cerebral venous sinus thrombosis, were also reviewed. Methods: A current literature search in PubMed, Embase and Google databases was performed to reveal the pathophysiology, prevalence, clinical manifestation, correlation and treatment of COVID-19, anaphylaxis with profuse hypotension, Kounis acute coronary syndrome and thrombotic events post vaccination. Results: The same key immunological pathophysiology mechanisms and cells seem to underlie COVID-19 cardiovascular complications and the anaphylaxis-associated Kounis syndrome. The myocardial injury in patients with COVID-19 has been attributed to coronary spasm, plaque rupture and microthrombi formation, hypoxic injury or cytokine storm disposing the same pathophysiology with the three clinical variants of Kounis syndrome. COVID-19-interrelated vaccine excipients as polysorbate, polyethelene glycol (PEG) and trometamol constitute potential allergenic substances. Conclusion: Better acknowledgement of the pathophysiological mechanisms, clinical similarities, multiorgan complications of COVID-19 or other viral infections as dengue and human immunodeficiency viruses along with the action of inflammatory cells inducing the Kounis syndrome could identify better immunological approaches for prevention, treatment of the COVID-19 pandemic as well as post-COVID-19 vaccine adverse reactions.
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18
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Aranha MP, Penfound TA, Salehi S, Botteaux A, Smeesters P, Dale JB, Smith JC. Design of Broadly Cross-Reactive M Protein-Based Group A Streptococcal Vaccines. THE JOURNAL OF IMMUNOLOGY 2021; 207:1138-1149. [PMID: 34341168 DOI: 10.4049/jimmunol.2100286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Accepted: 06/13/2021] [Indexed: 11/19/2022]
Abstract
Group A streptococcal infections are a significant cause of global morbidity and mortality. A leading vaccine candidate is the surface M protein, a major virulence determinant and protective Ag. One obstacle to the development of M protein-based vaccines is the >200 different M types defined by the N-terminal sequences that contain protective epitopes. Despite sequence variability, M proteins share coiled-coil structural motifs that bind host proteins required for virulence. In this study, we exploit this potential Achilles heel of conserved structure to predict cross-reactive M peptides that could serve as broadly protective vaccine Ags. Combining sequences with structural predictions, six heterologous M peptides in a sequence-related cluster were predicted to elicit cross-reactive Abs with the remaining five nonvaccine M types in the cluster. The six-valent vaccine elicited Abs in rabbits that reacted with all 11 M peptides in the cluster and functional opsonic Abs against vaccine and nonvaccine M types in the cluster. We next immunized mice with four sequence-unrelated M peptides predicted to contain different coiled-coil propensities and tested the antisera for cross-reactivity against 41 heterologous M peptides. Based on these results, we developed an improved algorithm to select cross-reactive peptide pairs using additional parameters of coiled-coil length and propensity. The revised algorithm accurately predicted cross-reactive Ab binding, improving the Matthews correlation coefficient from 0.42 to 0.74. These results form the basis for selecting the minimum number of N-terminal M peptides to include in potentially broadly efficacious multivalent vaccines that could impact the overall global burden of group A streptococcal diseases.
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Affiliation(s)
- Michelle P Aranha
- Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee, Knoxville, TN; .,Center for Molecular Biophysics, Oak Ridge National Laboratory, Oak Ridge, TN
| | - Thomas A Penfound
- Department of Medicine, Division of Infectious Diseases, University of Tennessee Health Science Center, Memphis, TN
| | - Sanaz Salehi
- Department of Medicine, Division of Infectious Diseases, University of Tennessee Health Science Center, Memphis, TN
| | - Anne Botteaux
- Molecular Bacteriology Laboratory, Free University of Brussels, Brussels, Belgium
| | - Pierre Smeesters
- Molecular Bacteriology Laboratory, Free University of Brussels, Brussels, Belgium.,Academic Children's Hospital Queen Fabiola, Free University of Brussels, Brussels, Belgium; and.,Centre for International Child Health, University of Melbourne, Melbourne, Victoria, Australia
| | - James B Dale
- Department of Medicine, Division of Infectious Diseases, University of Tennessee Health Science Center, Memphis, TN;
| | - Jeremy C Smith
- Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee, Knoxville, TN; .,Center for Molecular Biophysics, Oak Ridge National Laboratory, Oak Ridge, TN
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19
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Karki R, Kanneganti TD. The 'cytokine storm': molecular mechanisms and therapeutic prospects. Trends Immunol 2021; 42:681-705. [PMID: 34217595 DOI: 10.1016/j.it.2021.06.001] [Citation(s) in RCA: 154] [Impact Index Per Article: 51.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 06/09/2021] [Accepted: 06/10/2021] [Indexed: 12/15/2022]
Abstract
Cytokine storm syndrome (CSS) has generally been described as a collection of clinical manifestations resulting from an overactivated immune system. Cytokine storms (CSs) are associated with various pathologies, as observed in infectious diseases, certain acquired or inherited immunodeficiencies and autoinflammatory diseases, or following therapeutic interventions. Despite the role of CS in tissue damage and multiorgan failure, a systematic understanding of its underlying molecular mechanisms is lacking. Recent studies demonstrate a positive feedback loop between cytokine release and cell death pathways; certain cytokines, pathogen-associated molecular patterns (PAMPs), and damage-associated molecular patterns (DAMPs), can activate inflammatory cell death, leading to further cytokine secretion. Here, we discuss recent progress in innate immunity and inflammatory cell death, providing insights into the cellular and molecular mechanisms of CSs and therapeutics that might quell ensuing life-threatening effects.
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Affiliation(s)
- Rajendra Karki
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN, USA
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20
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Hui X, Xu Z, Cao L, Liu L, Lin X, Yang Y, Sun X, Zhang Q, Jin M. HP0487 contributes to the virulence of Streptococcus suis serotype 2 by mediating bacterial adhesion and anti-phagocytosis to neutrophils. Vet Microbiol 2021; 260:109164. [PMID: 34247113 DOI: 10.1016/j.vetmic.2021.109164] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Accepted: 06/17/2021] [Indexed: 01/15/2023]
Abstract
Streptococcus suis serotype 2 (SS2) is an important zoonotic pathogen that poses a serious threat to human health and the swine industry. The survival and travel in the bloodstream are the important causes for SS2, contributing to bacteremia, septicemia even septic shock. However, the related mechanism remains largely unknown. Preliminary experiment demonstrated that SS2 could largely attach to the surface of neutrophils, implying that this phenomenon maybe contributed to the travel of SS2 in bloodstream and then influenced its pathogenicity. To confirm this hypothesis, using a previously established screening method that combines affinity chromatography (based on liquid chromatography-tandem mass spectrometry) with shotgun proteomics, three candidate proteins (HP0487, HP1765, and HP1111) were identified from SS2 that could interact with neutrophils. Next, by constructing the deletion mutations, we demonstrated that HP0487 of three proteins could significantly influence the adhesion of SS2 to neutrophils. Furthermore, HP0487 was shown to contribute to the anti-phagocytosis of SS2 to neutrophils and RAW264.7 cells. More importantly, the deletion of HP0487 significantly reduced lethality and bacterial loads in vivo of SS2. Thus, our findings demonstrate that HP0487 contributes to SS2 virulence by mediating the adhesion and anti-phagocytosis of SS2 to neutrophils, promoting a better understanding about the pathogenesis of SS2.
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Affiliation(s)
- Xianfeng Hui
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China
| | - Zhongmin Xu
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China
| | - Lei Cao
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China
| | - Liang Liu
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China
| | - Xian Lin
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China
| | - Yong Yang
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China
| | - Xiaomei Sun
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China
| | - Qiang Zhang
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China; College of Biomedicine and Health, Huazhong Agricultural University, Wuhan, 430070, China.
| | - Meilin Jin
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China; Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, 430070, China; Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, Wuhan, 430070, China.
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21
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Invasive Streptococcus pyogenes disease in Spain: a microbiological and epidemiological study covering the period 2007-2019. Eur J Clin Microbiol Infect Dis 2021; 40:2295-2303. [PMID: 34046804 DOI: 10.1007/s10096-021-04279-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Accepted: 05/21/2021] [Indexed: 10/21/2022]
Abstract
The aim of this study is to present the first nationwide microbiological and epidemiological study of invasive group A Streptococcus (iGAS) disease in Spain. One thousand eight hundred ninety-three iGAS isolates were analyzed over 2007-2019. emm typing was performed by sequencing the gene's variable 5' end, exotoxin genes were identified by PCR, and antimicrobial susceptibility explored via the E test and disk diffusion. Five hundred twenty-three isolates were associated with sepsis, 292 with cellulitis, 232 with scarlet fever, 153 with pneumonia, 141 with streptococcal toxic shock syndrome, and 94 with necrotizing fasciitis. The most prevalent emm types were emm1 (449/1893 isolates), emm89 (210/1893), emm3 (208/1893), emm4 (150/1893), emm12 (112/1893) emm6 (107/1893), emm87 (89/1893), emm28 (88/1893), emm75 (78/1893), emm77 (78/1893), emm11 (58/1893), and emm22 (35/1893). emm1, emm3, emm4, and emm6 were the predominant types affecting children (mostly respiratory infections), while emm11, emm77, and emm89 prevailed in the elderly (mostly skin infections). Each emm type was associated with one or more exotoxin gene (spe, sme, and ssa) profiles. speA was detected in 660 isolates, speB in 1829, speC in 1014, speF in 1826, speG in 1651, speJ in 716, speH in 331, smeZ in 720, and ssa in 512. Isolates with speA were associated with the most severe infections. Penicillin susceptibility was universal. Two hundred twenty-four isolates were resistant to tetracycline, 169 to erythromycin, and 81 to clindamycin. Tetracycline, erythromycin, and clindamycin resistance rates declined over the study period. The above information could serve as the basis for continued surveillance efforts designed to control disease cause by this bacterium.
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22
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Alfarouk KO, AlHoufie STS, Ahmed SBM, Shabana M, Ahmed A, Alqahtani SS, Alqahtani AS, Alqahtani AM, Ramadan AM, Ahmed ME, Ali HS, Bashir A, Devesa J, Cardone RA, Ibrahim ME, Schwartz L, Reshkin SJ. Pathogenesis and Management of COVID-19. J Xenobiot 2021; 11:77-93. [PMID: 34063739 PMCID: PMC8163157 DOI: 10.3390/jox11020006] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Revised: 05/11/2021] [Accepted: 05/12/2021] [Indexed: 12/13/2022] Open
Abstract
COVID-19, occurring due to SARS-COV-2 infection, is the most recent pandemic disease that has led to three million deaths at the time of writing. A great deal of effort has been directed towards altering the virus trajectory and/or managing the interactions of the virus with its subsequent targets in the human body; these interactions can lead to a chain reaction-like state manifested by a cytokine storm and progress to multiple organ failure. During cytokine storms the ratio of pro-inflammatory to anti-inflammatory mediators is generally increased, which contributes to the instigation of hyper-inflammation and confers advantages to the virus. Because cytokine expression patterns fluctuate from one person to another and even within the same person from one time to another, we suggest a road map of COVID-19 management using an individual approach instead of focusing on the blockbuster process (one treatment for most people, if not all). Here, we highlight the biology of the virus, study the interaction between the virus and humans, and present potential pharmacological and non-pharmacological modulators that might contribute to the global war against SARS-COV-2. We suggest an algorithmic roadmap to manage COVID-19.
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Affiliation(s)
- Khalid O. Alfarouk
- Hala Alfarouk Cancer Center, Department of Evolutionary Pharmacology and Tumor Metabolism, Khartoum 11123, Sudan;
- Research Center, Zamzam University College, Khartoum 11123, Sudan;
| | - Sari T. S. AlHoufie
- Medical Laboratories Technology Department, College of Applied Medical Sciences, Taibah University, Medina 42353, Saudi Arabia;
| | - Samrein B. M. Ahmed
- College of Medicine, University of Sharjah, Sharjah 27272, United Arab Emirates;
| | - Mona Shabana
- Pharmacology Department, Faculty of Medicine, Fayoum University, Fayoum 63514, Egypt;
| | - Ahmed Ahmed
- Department of Oesphogastric and General Surgery, University Hospitals of Leicester, Leicester LE5 4PW, UK;
| | - Saad S. Alqahtani
- Pharmacy Practice Research Unit, Clinical Pharmacy Department, College of Pharmacy, Jazan University, Jazan 45142, Saudi Arabia;
| | - Ali S. Alqahtani
- Department of Medical Laboratories Sciences, College of Applied Medical Sciences, Najran University, Najran 66446, Saudi Arabia;
| | - Ali M. Alqahtani
- Department of Pharmacology, College of Pharmacy, King Khalid University, Abha 61421, Saudi Arabia;
| | - AbdelRahman M. Ramadan
- Department of Preventive Dental Sciences, Ibn Sina National College, Jeddah 22421, Saudi Arabia;
| | - Mohamed E. Ahmed
- Research Center, Zamzam University College, Khartoum 11123, Sudan;
- Department of Surgery, Faculty of Medicine Al-Neelain University, Khartoum 11111, Sudan
| | - Heyam S. Ali
- Faculty of Pharmacy, University of Khartoum, P. O. Box 321, Khartoum 11111, Sudan;
| | - Adil Bashir
- Hala Alfarouk Cancer Center, Department of Evolutionary Pharmacology and Tumor Metabolism, Khartoum 11123, Sudan;
- Institute of Endemic Diseases, University of Khartoum, Khartoum 11111, Sudan;
| | - Jesus Devesa
- Scientific Direction, Foltra Medical Centre, 15886 Teo, Spain;
| | - Rosa A. Cardone
- Department of Biosciences, Biotechnologies, and Biopharmaceutics, University of Bari, 70126 Bari, Italy; (R.A.C.); (S.J.R.)
| | - Muntaser E. Ibrahim
- Institute of Endemic Diseases, University of Khartoum, Khartoum 11111, Sudan;
| | | | - Stephan J. Reshkin
- Department of Biosciences, Biotechnologies, and Biopharmaceutics, University of Bari, 70126 Bari, Italy; (R.A.C.); (S.J.R.)
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Khalirakhmanov AF, Idrisova KF, Gaifullina RF, Zinchenko SV, Litvinov RI, Sharafeev AZ, Kiyasov AP, Rizvanov AA. Pathogenesis, Diagnosis, and Treatment of Hemostatic Disorders in COVID-19 Patients. Acta Naturae 2021; 13:79-84. [PMID: 34377558 PMCID: PMC8327143 DOI: 10.32607/actanaturae.11182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Accepted: 11/12/2020] [Indexed: 01/08/2023] Open
Abstract
The novel coronavirus infection named COVID-19 was first detected in Wuhan, China, in December 2019, and it has been responsible for significant morbidity and mortality in scores of countries. At the time this article was being written, the number of infected and deceased patients continued to grow worldwide. Most patients with severe forms of the disease suffer from pneumonia and pulmonary insufficiency; in many cases, the disease is generalized and causes multiple organ failures and a dysfunction of physiological systems. One of the most serious and prognostically ominous complications from COVID-19 is coagulopathy, in particular, decompensated hypercoagulability with the risk of developing disseminated intravascular coagulation. In most cases, local and diffuse macro- and microthromboses are present, a condition which causes multiple-organ failure and thromboembolic complications. The causes and pathogenic mechanisms of coagulopathy in COVID-19 remain largely unclear, but they are associated with systemic inflammation, including the so-called cytokine storm. Despite the relatively short period of the ongoing pandemic, laboratory signs of serious hemostatic disorders have been identified and measures for specific prevention and correction of thrombosis have been developed. This review discusses the causes of COVID-19 coagulopathies and the associated complications, as well as possible approaches to their early diagnosis, prevention, and treatment.
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Affiliation(s)
- A. F. Khalirakhmanov
- University Hospital “Kazan Federal University”, Kazan, 420043 Russia
- Kazan Federal University, Kazan, 420012 Russia
| | | | - R. F. Gaifullina
- University Hospital “Kazan Federal University”, Kazan, 420043 Russia
- Kazan Federal University, Kazan, 420012 Russia
| | | | - R. I. Litvinov
- Kazan Federal University, Kazan, 420012 Russia
- University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, 19104-6058 USA
| | - A. Z. Sharafeev
- Republican Clinical Hospital named after Sh.Sh. Ependiev, Grozniy, 364030 Russia
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Castro SA, Dorfmueller HC. A brief review on Group A Streptococcus pathogenesis and vaccine development. ROYAL SOCIETY OPEN SCIENCE 2021; 8:201991. [PMID: 33959354 PMCID: PMC8074923 DOI: 10.1098/rsos.201991] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Streptococcus pyogenes, also known as Group A Streptococcus (GAS), is a Gram-positive human-exclusive pathogen, responsible for more than 500 000 deaths annually worldwide. Upon infection, GAS commonly triggers mild symptoms such as pharyngitis, pyoderma and fever. However, recurrent infections or prolonged exposure to GAS might lead to life-threatening conditions. Necrotizing fasciitis, streptococcal toxic shock syndrome and post-immune mediated diseases, such as poststreptococcal glomerulonephritis, acute rheumatic fever and rheumatic heart disease, contribute to very high mortality rates in non-industrialized countries. Though an initial reduction in GAS infections was observed in high-income countries, global outbreaks of GAS, causing rheumatic fever and acute poststreptococcal glomerulonephritis, have been reported over the last decade. At the same time, our understanding of GAS pathogenesis and transmission has vastly increased, with detailed insight into the various stages of infection, beginning with adhesion, colonization and evasion of the host immune system. Despite deeper knowledge of the impact of GAS on the human body, the development of a successful vaccine for prophylaxis of GAS remains outstanding. In this review, we discuss the challenges involved in identifying a universal GAS vaccine and describe several potential vaccine candidates that we believe warrant pursuit.
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Affiliation(s)
- Sowmya Ajay Castro
- Division of Molecular Microbiology, School of Life Sciences, University of Dundee, Dow Street, Dundee, DD1 5EH, UK
| | - Helge C. Dorfmueller
- Division of Molecular Microbiology, School of Life Sciences, University of Dundee, Dow Street, Dundee, DD1 5EH, UK
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25
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McCabe GA, Hardy T, Campbell TG. Bilateral periorbital necrotising fasciitis associated with invasive group: a Streptococcus infection. BMJ Case Rep 2020; 13:13/12/e236800. [PMID: 33370943 DOI: 10.1136/bcr-2020-236800] [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] [Indexed: 11/03/2022] Open
Abstract
A previously independent 56-year-old immunocompetent woman presented with septic shock in the setting of periorbital swelling and diffuse infiltrates on chest imaging. Blood cultures were positive for growth of group A Streptococcus (GAS). Broad spectrum antimicrobials were initiated with the inclusion of the antitoxin agent clindamycin. Necrosis of periorbital tissue was noted and surgical consultation was obtained. Débridement of both eyelids with skin grafting was performed. GAS was isolated from wound cultures and also observed on periorbital tissue microscopy. The final diagnosis was bilateral periorbital necrotising fasciitis (PONF) associated with invasive GAS infection. The patient had a prolonged intensive care unit course with input from multiple specialist teams. This case demonstrates the importance of early recognition and treatment of PONF, the profound systemic morbidity caused by these infections, and illustrates successful multidisciplinary teamwork.
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Affiliation(s)
- Grace Anne McCabe
- Ophthalmology, Royal Melbourne Hospital, Melbourne, Victoria, Australia
| | - Thomas Hardy
- Ophthalmology, Royal Melbourne Hospital, Melbourne, Victoria, Australia.,Orbital Plastic and Lacrimal Clinic, Royal Victorian Eye and Ear Hospital, Melbourne, Victoria, Australia
| | - Thomas Gordon Campbell
- Ophthalmology, Royal Melbourne Hospital, Melbourne, Victoria, Australia .,Department of Surgery, University of Melbourne and Centre for Eye Research Australia, East Melbourne, Victoria, Australia
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26
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Yoshida H, Takahashi T, Matsui H. A naturally occurring point mutation in the rocA gene of Streptococcus pyogenes confers the highly virulent phenotype. J Infect Chemother 2020; 27:578-584. [PMID: 33309630 DOI: 10.1016/j.jiac.2020.11.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 11/02/2020] [Accepted: 11/09/2020] [Indexed: 11/18/2022]
Abstract
INTRODUCTION Mucoid (MTB313) and nonmucoid (MTB314) strains of group A streptococcus (GAS) emm (antiphagocytic M protein) type 1 were simultaneously isolated from a single patient suffering from streptococcal meningitis. In a CD46-expressing transgenic (CD46 Tg) mouse model of subcutaneous infection into both hind footpads with MTB313 or MTB314, MTB313 showed considerably higher virulence than MTB314. METHODS The comparative genomic analysis based on the whole-genome sequencing revealed that MTB313 possessed an amber codon within rocA (sensory transduction protein kinase), but MTB314 did not carry this stop codon. Thereafter, MAT101 was generated from MTB313 by introducing pRocA, which contained the full-length rocA from MTB314, into the cloning plasmid pLZ12-Km2. MAT100 was also generated by introducing pLZ12-Km2 into MTB313. RESULTS Although MTB313 and MAT100 showed large quantities of cell-associated hyaluronic acid (HA) in the culture pellets, MTB314 and MAT101 showed small quantities of HA production. Finally, higher mortalities were observed in the MTB313- or MAT100-infected CD46 Tg mice than the MTB314- or MAT101-infected CD46 Tg mice. CONCLUSIONS These data indicate the possibility that a spontaneous point mutation in the rocA gene led to the highly virulent phenotype of M1 GAS.
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Affiliation(s)
- Haruno Yoshida
- Department of Infection Control and Immunology, Omura Satoshi Memorial Institute and Graduate School of Infection Control Sciences, Kitasato University, 5-9-1 Shirokane, Minato-ku, Tokyo 108-8641, Japan
| | - Takashi Takahashi
- Department of Infection Control and Immunology, Omura Satoshi Memorial Institute and Graduate School of Infection Control Sciences, Kitasato University, 5-9-1 Shirokane, Minato-ku, Tokyo 108-8641, Japan
| | - Hidenori Matsui
- Department of Infection Control and Immunology, Omura Satoshi Memorial Institute and Graduate School of Infection Control Sciences, Kitasato University, 5-9-1 Shirokane, Minato-ku, Tokyo 108-8641, Japan.
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27
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Vita GM, De Simone G, Leboffe L, Montagnani F, Mariotti D, Di Bella S, Luzzati R, Gori A, Ascenzi P, di Masi A. Human Serum Albumin Binds Streptolysin O (SLO) Toxin Produced by Group A Streptococcus and Inhibits Its Cytotoxic and Hemolytic Effects. Front Immunol 2020; 11:507092. [PMID: 33363530 PMCID: PMC7752801 DOI: 10.3389/fimmu.2020.507092] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Accepted: 10/20/2020] [Indexed: 12/14/2022] Open
Abstract
The pathogenicity of group A Streptococcus (GAS) is mediated by direct bacterial invasivity and toxin-associated damage. Among the extracellular products, the exotoxin streptolysin O (SLO) is produced by almost all GAS strains. SLO is a pore forming toxin (PFT) hemolitically active and extremely toxic in vivo. Recent evidence suggests that human serum albumin (HSA), the most abundant protein in plasma, is a player in the innate immunity "orchestra." We previously demonstrated that HSA acts as a physiological buffer, partially neutralizing Clostridioides difficile toxins that reach the bloodstream after being produced in the colon. Here, we report the in vitro and ex vivo capability of HSA to neutralize the cytotoxic and hemolytic effects of SLO. HSA binds SLO with high affinity at a non-conventional site located in domain II, which was previously reported to interact also with C. difficile toxins. HSA:SLO recognition protects HEp-2 and A549 cells from cytotoxic effects and cell membrane permeabilization induced by SLO. Moreover, HSA inhibits the SLO-dependent hemolytic effect in red blood cells isolated from healthy human donors. The recognition of SLO by HSA may have a significant protective role in human serum and sustains the emerging hypothesis that HSA is an important constituent of the innate immunity system.
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Affiliation(s)
| | | | - Loris Leboffe
- Department of Sciences, Roma Tre University, Roma, Italy
| | - Francesca Montagnani
- Department of Medical Biotechnologies, University of Siena, Siena, Italy.,Infectious and Tropical Diseases Unit, Department of Medical Sciences, Hospital of Siena, Siena, Italy
| | | | - Stefano Di Bella
- Infectious Diseases Unit, Clinical Department of Medical, Siurgical, and Health Sciences, University of Trieste, Trieste, Italy
| | - Roberto Luzzati
- Infectious Diseases Unit, Clinical Department of Medical, Siurgical, and Health Sciences, University of Trieste, Trieste, Italy
| | - Andrea Gori
- Infectious Diseases Unit, Department of Internal Medicine, Fondazione IRCCS Ca' Granda, Ospedale Maggiore Policlinico, Centre for Multidisciplinary Research in Health Science (MACH), University of Milan, Milan, Italy
| | - Paolo Ascenzi
- Department of Sciences, Roma Tre University, Roma, Italy
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Antibody Modified Gold Electrode as an Impedimetric Biosensor for the Detection of Streptococcus pyogenes. SENSORS 2020; 20:s20185324. [PMID: 32957594 PMCID: PMC7570824 DOI: 10.3390/s20185324] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Revised: 09/09/2020] [Accepted: 09/15/2020] [Indexed: 12/31/2022]
Abstract
Streptococcus pyogenes is a known cause of a wide spectrum of diseases, from mild and acute to severe invasive infections. This paper concerns the development of a novel impedimetric biosensor for the detection of the mentioned human pathogen. The proposed biosensor is a gold disk electrode modified with commercially available antibodies attached to the surface of the electrode by carbodiimide chemistry. The conducted tests confirmed the specificity of the antibodies used, which was also demonstrated by the results obtained during the detection of S. pyogenes using electrochemical impedance spectroscopy. The developed sensor successfully detected the presence of S. pyogenes in the sample and the detection limit was calculated as 9.3 cfu/mL. The results obtained show a wide linear range for verified concentrations of this pathogen in a sample from 4.2 × 102 to 4.2 × 106 cfu/mL. Furthermore, the optimal experimentally determined time required to perform pathogen detection in the sample was estimated as 3 min, and the test did not lead to the degradation of the sample.
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29
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Tsai WC, Shen CF, Lin YL, Shen FC, Tsai PJ, Wang SY, Lin YS, Wu JJ, Chi CY, Liu CC. Emergence of macrolide-resistant Streptococcus pyogenes emm12 in southern Taiwan from 2000 to 2019. JOURNAL OF MICROBIOLOGY, IMMUNOLOGY, AND INFECTION = WEI MIAN YU GAN RAN ZA ZHI 2020; 54:1086-1093. [PMID: 32994137 DOI: 10.1016/j.jmii.2020.08.019] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2020] [Revised: 08/26/2020] [Accepted: 08/30/2020] [Indexed: 11/29/2022]
Abstract
BACKGROUND Group A Streptococcus (GAS) is an important pathogen causing morbidity and mortality worldwide. Surveillance of resistance and emm type has important implication to provide helpful information on the changing GAS epidemiology and empirical treatment. METHODS To study the emergence of resistant GAS in children with upper respiratory tract infection (URTI), a retrospective study was conducted from 2000 to 2019 in southern Taiwan. Microbiological studies, including antibiotic susceptibility, were performed. GAS emm types and sequences were determined by molecular methods. The population was divided into two separate decades to analyze potential changes over time. The 1st decade was 2000-2009; the 2nd decade was 2010-2019. Multivariate analyses were performed to identify independent risk factors associated with macrolide resistance between these periods. RESULTS A total of 320 GAS from 339 children were enrolled. Most of the children (75%) were under 9 years of age. The most common diagnosis was scarlet fever (225, 66.4%), and the frequency increased from 54.8% in the 1st to 77.9% in the 2nd decade (p < 0.0001). There was a significant increase in resistance to erythromycin and azithromycin from 18.1%, 19.3% in the 1st to 58.4%, 61.0% in the 2nd decade (p < 0.0001). This was associated with clonal expansion of the GAS emm12-ST36 which carrying erm(B) and tet(M) from 3.0% in the 1st to 53.2% in the 2nd decade (p < 0.0001). CONCLUSIONS Significant emergence of macrolide-resistant GAS emm12-ST36 in children supports the need for continuing surveillance and investigation for the clonal virulence.
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Affiliation(s)
- Wei-Chun Tsai
- Department of Pediatrics, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan City, Taiwan
| | - Ching-Fen Shen
- Department of Pediatrics, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan City, Taiwan
| | - Ya-Lan Lin
- Department of Pediatrics, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan City, Taiwan
| | - Fan-Ching Shen
- National Institute of Infectious Diseases and Vaccinology, National Health Research Institutes, Miaoli County, Taiwan
| | - Pei-Jane Tsai
- Department of Medical Laboratory Science and Biotechnology, College of Medicine, National Cheng Kung University, Tainan City, Taiwan; Center of Infectious Disease and Signaling Research, National Cheng Kung University, Tainan City, Taiwan
| | - Shu-Ying Wang
- Center of Infectious Disease and Signaling Research, National Cheng Kung University, Tainan City, Taiwan; Department of Microbiology and Immunology, College of Medicine, National Cheng Kung University, Tainan City, Taiwan
| | - Yee-Shin Lin
- Center of Infectious Disease and Signaling Research, National Cheng Kung University, Tainan City, Taiwan; Department of Microbiology and Immunology, College of Medicine, National Cheng Kung University, Tainan City, Taiwan
| | - Jiunn-Jong Wu
- Department of Biotechnology and Laboratory Science in Medicine, School of Biomedical Science and Engineering, National Yang Ming University, Taipei, Taiwan
| | - Chia-Yu Chi
- Department of Pediatrics, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan City, Taiwan; National Institute of Infectious Diseases and Vaccinology, National Health Research Institutes, Miaoli County, Taiwan; Environmental and Occupational Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.
| | - Ching-Chuan Liu
- Department of Pediatrics, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan City, Taiwan; Center of Infectious Disease and Signaling Research, National Cheng Kung University, Tainan City, Taiwan.
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30
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An PJ, Zhu YZ, Yang LP. Biochemical indicators of coronavirus disease 2019 exacerbation and the clinical implications. Pharmacol Res 2020; 159:104946. [PMID: 32450346 PMCID: PMC7244444 DOI: 10.1016/j.phrs.2020.104946] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Revised: 05/13/2020] [Accepted: 05/19/2020] [Indexed: 01/08/2023]
Abstract
Coronavirus Disease 2019 (COVID-19) has sparked a global pandemic, affecting more than 4 million people worldwide. The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) can cause acute lung injury (ALI) and even acute respiratory distress syndrome (ARDS); with a fatality of 7.0 %. Accumulating evidence suggested that the progression of COVID-19 is associated with lymphopenia and excessive inflammation, and a subset of severe cases might exhibit cytokine storm triggered by secondary hemophagocytic lymphohistiocytosis (sHLH). Furthermore, secondary bacterial infection may contribute to the exacerbation of COVID-19. We recommend using both IL-10 and IL-6 as the indicators of cytokine storm, and monitoring the elevation of procalcitonin (PCT) as an alert for initiating antibacterial agents. Understanding the dynamic progression of SARS-CoV-2 infection is crucial to determine an effective treatment strategy to reduce the rising mortality of this global pandemic.
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Affiliation(s)
- Peng-Jiao An
- Department of Pharmacy, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing Key Laboratory of Drug Clinical Risk and Personalized Medication Evaluation, Beijing 100730, China; Department of Pharmacy Administration and Clinical Pharmacy, School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
| | - Yi Zhun Zhu
- School of Pharmacy and State Key Laboratory for the Quality Research of Chinese Medicine, Macau University of Science and Technology, Macau, China
| | - Li-Ping Yang
- Department of Pharmacy, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing Key Laboratory of Drug Clinical Risk and Personalized Medication Evaluation, Beijing 100730, China.
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31
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Feldman M, Ginsburg I. A novel aspect may explain the mechanisms of pathogenicity of rheumatic fever, a multifactorial, autoimmune, infectious and inflammatory disorder which "licks the joints and bites the heart": A working hypothesis. Med Hypotheses 2020; 144:110222. [PMID: 33254529 DOI: 10.1016/j.mehy.2020.110222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Revised: 07/20/2020] [Accepted: 08/23/2020] [Indexed: 11/19/2022]
Abstract
A novel hypothesis is presented to explain the pathogenesis of the multifactorial autoimmune disorder rheumatic fever (RF). It involves a synergistic interaction among streptococcal toxins, their cell wall components, M protein, immune complexes, complement components, cationic histones. These agents can act with cationic histones released by neutrophils during NETosis and bacteriolysis and can function as opsonic agents possessing properties similar to antibodies. Cationic histones can interact by strong electrostatic forces with negatively- charged domains on immune complexes and complement components. This allows their deposition and endocytosis in the myocardium, the heart valves, and in the joints. However, the main cause of cell and tissue damage observed in RF is due to a synergism among the plethora of pro-inflammatory substances released by activated neutrophils and macrophages. Cell damage may be mitigated to some extent by anionic heparins, heparinoids, and by anti-inflammatory drugs such as corticosteroids which counteract neutrophils and macrophage chemotaxis induced by cytokines.
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Affiliation(s)
- Mark Feldman
- Institute for Dental Sciences the Hebrew University Hadassah Faculty of Dental Medicine, Ein Kerem Campus, Jerusalem, Israel.
| | - Isaac Ginsburg
- Institute for Dental Sciences the Hebrew University Hadassah Faculty of Dental Medicine, Ein Kerem Campus, Jerusalem, Israel
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Integrin α5β1, as a Receptor of Fibronectin, Binds the FbaA Protein of Group A Streptococcus To Initiate Autophagy during Infection. mBio 2020; 11:mBio.00771-20. [PMID: 32518187 PMCID: PMC7371361 DOI: 10.1128/mbio.00771-20] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Autophagy is generally considered a strategy used by the innate immune system to eliminate invasive pathogens through capturing and transferring them to lysosomes. Currently, researchers pay more attention to how virulence factors secreted by GAS regulate the autophagic process. Here, we provide the first evidence that the structural protein FbaA of M1 GAS strain SF370 is a potent inducer of autophagy in epithelial cells. Furthermore, we demonstrate that integrin α5β1 in epithelial cells in vitro and in vivo acts as a receptor to initiate the signaling for inducing autophagy by binding to FbaA of M1 GAS strain SF370 via Fn. Our study reveals the underlying mechanisms by which pathogens induce Fn-integrin α5β1 to trigger autophagy in a conserved pattern in epithelial cells. Group A Streptococcus (GAS), one of the most common extracellular pathogens, has been reported to invade epithelial and endothelial cells. Our results reveal that M1 GAS strain SF370 can be effectively eliminated by respiratory epithelial cells. Emerging evidence indicates that autophagy is an important strategy for nonphagocytes to eliminate intracellular bacteria. Upon pathogen recognition, cell surface receptors can directly trigger autophagy, which is a critical step in controlling infection. However, the mechanisms of how cells sense invading bacteria and use this information specifically to trigger autophagy remain unclear. In this study, we stimulated cells and infected mice with M and FbaA mutants of M1 GAS strain SF370 or with purified M and FbaA proteins (two critical surface structural proteins of GAS), and found that only FbaA protein was involved in autophagy induction. Furthermore, the FbaA protein induced autophagy independent of common pattern recognition receptors (such as Toll-like receptors); rather, it relies on binding to integrin α5β1 expressed on the cell surface, which is mediated by extracellular matrix protein fibronectin (Fn). The FbaA-Fn-integrin α5β1 complex activates Beclin-1 through the mTOR-ULK1–Beclin-1 pathway, which enables the Beclin-1/Vps34 complex to recruit Rab7 and, ultimately, to promote the formation of autophagosomes. By knocking down integrin α5β1, Fn, Atg5, Beclin-1, and ULK1 in Hep2 cells and deleting Atg5 or integrin α5β1 in mice, we reveal a novel role for integrin α5β1 in inducing autophagy. Our study demonstrates that integrin α5β1, through interacting with pathogen components, initiates effective host innate immunity against invading intracellular pathogens.
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Altun M, Mericli Yapıcı B. Detection of Group A Beta Hemolytic Streptococci Species, emm, and Exotoxin Genes Isolated from Patients with Tonsillopharyngitis. Curr Microbiol 2020; 77:2064-2070. [PMID: 32367278 PMCID: PMC7222056 DOI: 10.1007/s00284-020-01994-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2020] [Accepted: 04/10/2020] [Indexed: 10/25/2022]
Abstract
Group A Beta Hemolytic Streptococci (GAS) is the most critical human pathogen that leads to tonsillopharyngitis. The aims of this study were to identify GAS isolates and to determine emm typing, the coverage rate of available vaccines, and the distribution of superantigen gene profiles. 15 GAS isolates were isolated from throat cultures of 200 patients with tonsillopharyngitis, who were admitted to Canakkale Health Application and Research Hospital between October 2017 and May 2018. Identification of the isolates was performed by conventional methods and 16S rRNA sequence analysis. emm typing and exotoxin profiling of the isolates were performed by polymerase chain reaction. 7.5% GAS was detected in 200 patients. All the GAS isolates were identified as S. pyogenes. emm typing can be carried out in 13 S. pyogenes isolates. emm89 (33.3%), emm44 (20%), emm6 (13.3%), emm84 (6.7%), emm1 (6.7%), and emm18.1 (6.7%) were found to be six emm types. The coverage rate of S. pyogenes strains for 26-valent vaccine was 61.5% and for the 30-valent vaccine 84.6%. The most common exotoxin was speB (86.7%), followed by speC (60%), speF (33.3%), ssa (26.7%), speA (20%), speM (20%), speJ (13.3%), speL (6.7%), and speI (6.7%). As a result of determining the emm types of S. pyogenes species in Canakkale, it was concluded that the potential of 30-valent vaccine should be considered in Turkey and development of vaccines containing exotoxin types may be beneficial.
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Affiliation(s)
- Mehzat Altun
- Vocational School of Health Services, Canakkale Onsekiz Mart University, Canakkale, Turkey
| | - Binnur Mericli Yapıcı
- Department of Biology, Faculty of Sciences and Arts, Canakkale Onsekiz Mart University, 17020, Canakkale, Turkey.
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34
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Baindara P, Ghosh AK, Mandal SM. Coevolution of Resistance Against Antimicrobial Peptides. Microb Drug Resist 2020; 26:880-899. [PMID: 32119634 DOI: 10.1089/mdr.2019.0291] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Antimicrobial peptides (AMPs) are produced by all forms of life, ranging from eukaryotes to prokaryotes, and they are a crucial component of innate immunity, involved in clearing infection by inhibiting pathogen colonization. In the recent past, AMPs received high attention due to the increase of extensive antibiotic resistance by these pathogens. AMPs exhibit a diverse spectrum of activity against bacteria, fungi, parasites, and various types of cancer. AMPs are active against various bacterial pathogens that cause disease in animals and plants. However, because of the coevolution of host and pathogen interaction, bacteria have developed the mechanisms to sense and exhibit an adaptive response against AMPs. These resistance mechanisms are playing an important role in bacterial virulence within the host. Here, we have discussed the different resistance mechanisms used by gram-positive and gram-negative bacteria to sense and combat AMP actions. Understanding the mechanism of AMP resistance may provide directions toward the development of novel therapeutic strategies to control multidrug-resistant pathogens.
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Affiliation(s)
- Piyush Baindara
- Department of Microbiology and Immunology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - Ananta K Ghosh
- Department of Biotechnology, Central Research Facility, Indian Institute of Technology Kharagpur, Kharagpur, India
| | - Santi M Mandal
- Department of Biotechnology, Central Research Facility, Indian Institute of Technology Kharagpur, Kharagpur, India
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Note S, Soentjens P, Van Laer M, Meert P, Vanbrabant P. Streptococcal toxic shock syndrome in a returning traveller. Acta Clin Belg 2019; 74:430-434. [PMID: 30369302 DOI: 10.1080/17843286.2018.1539634] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Background: A patient presenting with fever and purpura after a stay in the tropics tempts a physician to make a differential diagnosis mainly focusing on imported diseases. Although the importance of considering a tropical disease is obvious, the fact that cosmopolitan infections account for one third of the cases in a febrile returning traveler must not be overseen. Toxic Shock Syndrome is amongst the most notorious diseases due to the high mortality when inappropriately managed and the association with necrotizing fasciitis. Methods : We present a 60-year old female with fever, shock syndrome and progressive appearance of painful purpura on the lower legs after a 2-week holiday in Zanzibar. Results : The patient was diagnosed with Streptococcal Toxic Shock Syndrome. Treatment focusing on aggressive fluid resuscitation, prompt administration of antibiotics (ceftriaxon, doxycycline and one dose of amikacin) and adjunctive treatment by clindamycin and immunoglobulin was initiated. She was also immediately taken into surgery for a bilateral fasciotomy and surgical exploration of the lower legs. Histology appeared compatible with purpura fulminans, thereby excluding necrotizing fasciitis. No source of infection could be identified. Conclusion: Toxic Shock Syndrome remains a challenging diagnosis and even more in a returning traveler with an extensive differential diagnosis containing both tropical and cosmopolitan diseases. Cornerstones for the treatment of Streptococcal Toxic Shock Syndrome are abrupt administration of antimicrobial therapy comprising beta-lactam antibiotics and clindamycin and surgical exploration to apply source control when indicated.
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Affiliation(s)
- Stéphanie Note
- Medical Component, Royal Military Academy, Brussels, Belgium
- Emergency Department, Cliniques Universitaires Saint-Luc, Brussels, Belgium
| | - Patrick Soentjens
- Center for Infectious Diseases ID4C, Military Hospital Queen Astrid, Brussels, Belgium
- Department of Clinical Sciences, Institute of Tropical Medicine, Antwerp, Belgium
| | - Marie Van Laer
- Emergency Department, Cliniques Universitaires Saint-Luc, Brussels, Belgium
| | - Philippe Meert
- Emergency Department, Cliniques Universitaires Saint-Luc, Brussels, Belgium
| | - Peter Vanbrabant
- Center for Infectious Diseases ID4C, Military Hospital Queen Astrid, Brussels, Belgium
- General Internal Medicine, University Hospitals Leuven, Leuven, Belgium
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Konrad P, Hufnagel M, Berner R, Toepfner N. Long-term, single-center surveillance of non-invasive group A streptococcal (GAS) infections, emm types and emm clusters. Eur J Clin Microbiol Infect Dis 2019; 39:273-280. [PMID: 31758439 DOI: 10.1007/s10096-019-03719-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Accepted: 09/20/2019] [Indexed: 10/25/2022]
Abstract
Group A streptococci (GAS) are among the most frequent pathogens in children. Many epidemiological studies focus on specific GAS infections (such as tonsillopharyngitis or invasive disease), on GAS carriers or on post-streptococcal sequelae. By comparison, reports on regional GAS characteristics, particularly circulating non-invasive GAS in Europe, are rare. In a monocentric study, all GAS isolated from pediatric patients at a tertiary care hospital over a 6-year period (2006-2012) were characterized. GAS emm types and clusters were determined. Associated patient data were analyzed. Five hundred sixty-six GAS strains were collected. GAS tonsillopharyngitis was most common (71.6%), followed by pyoderma (6.0%), otitis media (3.7%), perineal dermatitis (3.4%), and invasive infections (1.4%). Colonizing strains represented 13.6% of GAS. GAS emm12 was most prevalent among invasive and non-invasive isolates. Emm1, emm4, emm28, and emm89 were the most frequent non-invasive GAS strains. The emm E4 cluster was most common, followed by the A-C4, A-C3, and E1. Among the GAS infections, different emm types and clusters were identified, e.g., emm4 was more common among patients with scarlet fever. Three new emm subtypes were characterized: emm29.13, emm36.7, and emm75.5. This comprehensive review of a large, local GAS cohort points to the differences between and similarities among GAS genotypes and disease manifestations, while minimizing regional variations. Considerable deviation from previous epidemiological findings is described, especially regarding the frequent detection of emm1 and emm89 in non-invasive GAS infections. Periodic updates on molecular and epidemiological GAS characteristics are needed to track the multifaceted pathogenic potential of GAS.
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Affiliation(s)
- Peter Konrad
- Department of Pediatrics, Carl Gustav Carus University Hospital, Technical University Dresden, Dresden, Germany
| | - Markus Hufnagel
- Department of Pediatrics and Adolescent Medicine, University Medical Center, Medical Faculty, University of Freiburg, Freiburg, Germany
| | - Reinhard Berner
- Department of Pediatrics, Carl Gustav Carus University Hospital, Technical University Dresden, Dresden, Germany
| | - Nicole Toepfner
- Department of Pediatrics, Carl Gustav Carus University Hospital, Technical University Dresden, Dresden, Germany.
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Abstract
The development of a vaccine for group A streptococcus (GAS) is of paramount importance given that GAS infections cause more than 500,000 deaths annually across the world. This prospective passive surveillance laboratory study evaluated the potential coverage of the M protein-based vaccine currently under development. While a number of GAS strains isolated from this sub-Sahara African study were included in the current vaccine formulation, we nevertheless report that potential vaccine coverage for GAS infection in our setting was approximately 60%, with four of the most prevalent strains not included. This research emphasizes the need to reformulate the vaccine to improve coverage in areas where the burden of disease is high. Group A streptococcus (GAS) is responsible for a wide range of noninvasive group A streptococcal (non-iGAS) and invasive group A streptococcal (iGAS) infections. Information about the emm type variants of the M protein causing GAS disease is important to assess potential vaccine coverage of a 30-valent vaccine under development, particularly with respect to how they compare and contrast with non-iGAS isolates, especially in regions with a high burden of GAS. We conducted a prospective passive surveillance study of samples from patients attending public health facilities in Cape Town, South Africa. We documented demographic data and clinical presentation. emm typing was conducted using CDC protocols. GAS was commonly isolated from pus swabs, blood, deep tissue, and aspirates. Clinical presentations included wound infections (20%), bacteremia (15%), abscesses (9%), and septic arthritis (8%). Forty-six different emm types were identified, including M76 (16%), M81 (10%), M80 (6%), M43 (6%), and M183 (6%), and the emm types were almost evenly distributed between non-iGAS and iGAS isolates. There was a statistically significant association with M80 in patients presenting with noninvasive abscesses. Compared to the 30-valent vaccine under development, the levels of potential vaccine coverage for non-iGAS and iGAS infection were 60% and 58%, respectively, notably lower than the coverage in developed countries; five of the most prevalent emm types, M76, M81, M80, M43, and M183, were not included. The emm types from GAS isolated from patients with invasive disease did not differ significantly from those from noninvasive disease cases. There is low coverage of the multivalent M protein vaccine in our setting, emphasizing the need to reformulate the vaccine to improve coverage in areas where the burden of disease is high. IMPORTANCE The development of a vaccine for group A streptococcus (GAS) is of paramount importance given that GAS infections cause more than 500,000 deaths annually across the world. This prospective passive surveillance laboratory study evaluated the potential coverage of the M protein-based vaccine currently under development. While a number of GAS strains isolated from this sub-Sahara African study were included in the current vaccine formulation, we nevertheless report that potential vaccine coverage for GAS infection in our setting was approximately 60%, with four of the most prevalent strains not included. This research emphasizes the need to reformulate the vaccine to improve coverage in areas where the burden of disease is high.
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Coppens J, Xavier BB, Loens K, Lammens C, Ieven M, Matheeussen V, Goossens H, Malhotra-Kumar S. Remarkable Genome Stability among emm1 Group A Streptococcus in Belgium over 19 Years. Genome Biol Evol 2019; 11:1432-1439. [PMID: 31065672 PMCID: PMC6521816 DOI: 10.1093/gbe/evz093] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/23/2019] [Indexed: 12/30/2022] Open
Abstract
During the last two decades, there has been a public health concern of severe invasive infections caused by Group A Streptococcus (GAS) of the emm1 genotype. This study investigated the dynamics of emm1 GAS during 1994–2013 in Belgium. emm1 GAS isolated from blood, tissue, and wounds of patients with invasive infections (n = 23, S1–S23), and from patients with uncomplicated pharyngitis (n = 15, NS1–NS15) were subjected to whole-genome mapping (WGM; kpn) (Opgen). Whole-genome sequencing was performed on 25 strains (WGS; S1–S23 and NS6–NS7) (Illumina Inc.). Belgian GAS belonged to the M1T1 clone typified by the 36-kb chromosomal region encoding extracellular toxins, NAD+-glycohydrolase and streptolysin O. Strains from 1994–1999 clustered together with published strains (MGAS5005 and M1476). From 2001 onward, invasive GAS showed higher genomic divergence in the accessory genome and harbored on average 7% prophage content. Low evolutionary rate (2.49E-008; P > 0.05) was observed in this study, indicating a highly stable genome. The studied invasive and pharyngitis isolates were no genetically distinct populations based on the WGM and core genome phylogeny analyses. Two copies of the speJ superantigen were present in the 1999 and 2010 study strains (n = 3), one being chromosomal and one being truncated and associated with phage remnants. This study showed that emm1 GAS in Belgium, compared with Canada and UK M1 strains, were highly conserved by harboring a remarkable genome stability over a 19-year period with variations observed in the accessory genome.
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Affiliation(s)
- Jasmine Coppens
- Laboratory of Medical Microbiology, Vaccine & Infectious Disease Institute, University of Antwerp, Belgium
| | - Basil Britto Xavier
- Laboratory of Medical Microbiology, Vaccine & Infectious Disease Institute, University of Antwerp, Belgium
| | - Katherine Loens
- Belgian Reference Centre for Group A Streptococcus, Antwerp University Hospital, Antwerp, Belgium
| | - Christine Lammens
- Laboratory of Medical Microbiology, Vaccine & Infectious Disease Institute, University of Antwerp, Belgium
| | - Margareta Ieven
- Laboratory of Medical Microbiology, Vaccine & Infectious Disease Institute, University of Antwerp, Belgium.,Belgian Reference Centre for Group A Streptococcus, Antwerp University Hospital, Antwerp, Belgium
| | - Veerle Matheeussen
- Belgian Reference Centre for Group A Streptococcus, Antwerp University Hospital, Antwerp, Belgium
| | - Herman Goossens
- Laboratory of Medical Microbiology, Vaccine & Infectious Disease Institute, University of Antwerp, Belgium.,Belgian Reference Centre for Group A Streptococcus, Antwerp University Hospital, Antwerp, Belgium
| | - Surbhi Malhotra-Kumar
- Laboratory of Medical Microbiology, Vaccine & Infectious Disease Institute, University of Antwerp, Belgium
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39
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Kim S, Lee S, Park H, Kim S. Predominance of emm4 and antibiotic resistance of Streptococcus pyogenes in acute pharyngitis in a southern region of Korea. J Med Microbiol 2019; 68:1053-1058. [PMID: 31169483 DOI: 10.1099/jmm.0.001005] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND Streptococcus pyogenes is the most common cause of bacterial pharyngitis. Genotyping of emm is useful for molecular epidemiological survey of S. pyogenes. Antibiotic resistance data are needed for empirical treatments. METHODS In total, 358 children in Changwon, Korea who had pharyngitis symptoms were subjected to throat cultures to isolate S. pyogenes in 2017. emm genotyping was performed by direct sequencing. An antibiotic susceptibility test was performed using the disk diffusion method for erythromycin (ERY), clindamycin (CLI), tetracycline (TET) and ofloxacin (OFX). Screening for macrolide resistance phenotype and its determinants was performed for the ERY-resistant strains. RESULTS A total of 190 strains (53.1 %) of S. pyogenes were isolated from 358 children. The most frequent emm genotype was emm4 (53.2 %), followed by emm89 (12.6 %), emm28 (11.6 %) and emm1 (10 %). Antibiotic resistance rates to ERY, CLI, TET and OFX were 3.2 %, 2.6 %, 1.1 % and 2.6%, respectively. There were five isolates of the cMLSB phenotype having the ermB gene and one M phenotype harbouring the mefA gene. CONCLUSIONS The distribution of emm genotypes was quite different from those previously reported in Korea. emm4 accounted for more than 50 % of the genotypes. Macrolide resistance rates remained very low, but five of six ERY-resistant strains displayed the cMLSB phenotype.
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Affiliation(s)
- Seungwook Kim
- Department of Convergence of Medical Science, Gyeongsang National University Graduate School, Jinju, Republic of Korea
| | - Seungjun Lee
- Department of Laboratory Medicine, Gyeongsang National University Changwon Hospital, Changwon, Republic of Korea
| | - Hyunwoong Park
- Department of Laboratory Medicine, Seoul National University Boramae Medical Center, Seoul, Republic of Korea
| | - Sunjoo Kim
- Department of Laboratory Medicine, Institute of Health Sciences, Gyeongsang National University College of Medicine, Jinju, Republic of Korea
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40
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Ermert D, Laabei M, Weckel A, Mörgelin M, Lundqvist M, Björck L, Ram S, Linse S, Blom AM. The Molecular Basis of Human IgG-Mediated Enhancement of C4b-Binding Protein Recruitment to Group A Streptococcus. Front Immunol 2019; 10:1230. [PMID: 31214187 PMCID: PMC6557989 DOI: 10.3389/fimmu.2019.01230] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Accepted: 05/14/2019] [Indexed: 11/25/2022] Open
Abstract
Streptococcus pyogenes infects over 700 million people worldwide annually. Immune evasion strategies employed by the bacteria include binding of the complement inhibitors, C4b-binding protein (C4BP) and Factor H in a human-specific manner. We recently showed that human IgG increased C4BP binding to the bacterial surface, which promoted streptococcal immune evasion and increased mortality in mice. We sought to identify how IgG promotes C4BP binding to Protein H, a member of the M protein family. Dimerization of Protein H is pivotal for enhanced binding to human C4BP. First, we illustrated that Protein H, IgG, and C4BP formed a tripartite complex. Second, surface plasmon resonance revealed that Protein H binds IgG solely through Fc, but not Fab domains, and with high affinity (IgG-Protein H: KD = 0.4 nM; IgG-Fc-Protein H: KD ≤ 1.6 nM). Each IgG binds two Protein H molecules, while up to six molecules of Protein H bind one C4BP molecule. Third, interrupting Protein H dimerization either by raising temperature to 41°C or with a synthetic peptide prevented IgG-Protein H interactions. IgG-Fc fragments or monoclonal human IgG permitted maximal C4BP binding when used at concentrations from 0.1 to 10 mg/ml. In contrast, pooled human IgG enhanced C4BP binding at concentrations up to 1 mg/ml; decreased C4BP binding at 10 mg/ml occurred probably because of Fab-streptococcal interactions at these high IgG concentrations. Taken together, our data show how S. pyogenes exploits human IgG to evade complement and enhance its virulence. Elucidation of this mechanism could aid design of new therapeutics against S. pyogenes.
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Affiliation(s)
- David Ermert
- Division of Medical Protein Chemistry, Department of Translational Medicine, Lund University, Malmö, Sweden.,Division of Infectious Diseases and Immunology, Department of Medicine, University of Massachusetts Medical School, Worcester, MA, United States
| | - Maisem Laabei
- Division of Medical Protein Chemistry, Department of Translational Medicine, Lund University, Malmö, Sweden
| | - Antonin Weckel
- Division of Medical Protein Chemistry, Department of Translational Medicine, Lund University, Malmö, Sweden
| | | | - Martin Lundqvist
- Department of Biochemistry and Structural Biology, Center for Molecular Protein Science, Lund University, Lund, Sweden
| | - Lars Björck
- Division of Infection Medicine, Department of Clinical Sciences, Lund University, Lund, Sweden
| | - Sanjay Ram
- Division of Infectious Diseases and Immunology, Department of Medicine, University of Massachusetts Medical School, Worcester, MA, United States
| | - Sara Linse
- Department of Biochemistry and Structural Biology, Center for Molecular Protein Science, Lund University, Lund, Sweden
| | - Anna M Blom
- Division of Medical Protein Chemistry, Department of Translational Medicine, Lund University, Malmö, Sweden
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41
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Gu HJ, Sun QL, Luo JC, Zhang J, Sun L. A First Study of the Virulence Potential of a Bacillus subtilis Isolate From Deep-Sea Hydrothermal Vent. Front Cell Infect Microbiol 2019; 9:183. [PMID: 31214515 PMCID: PMC6554283 DOI: 10.3389/fcimb.2019.00183] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Accepted: 05/13/2019] [Indexed: 02/05/2023] Open
Abstract
Bacillus subtilis is the best studied Gram-positive bacterium, primarily as a model of cell differentiation and industrial exploitation. To date, little is known about the virulence of B. subtilis. In this study, we examined the virulence potential of a B. subtilis strain (G7) isolated from the Iheya North hydrothermal field of Okinawa Trough. G7 is aerobic, motile, endospore-forming, and requires NaCl for growth. The genome of G7 is composed of one circular chromosome of 4,216,133 base pairs with an average GC content of 43.72%. G7 contains 4,416 coding genes, 27.5% of which could not be annotated, and the remaining 72.5% were annotated with known or predicted functions in 25 different COG categories. Ten sets of 23S, 5S, and 16S ribosomal RNA operons, 86 tRNA and 14 sRNA genes, 50 tandem repeats, 41 mini-satellites, one microsatellite, and 42 transposons were identified in G7. Comparing to the genome of the B. subtilis wild type strain NCIB 3610T, G7 genome contains many genomic translocations, inversions, and insertions, and twice the amount of genomic Islands (GIs), with 42.5% of GI genes encoding hypothetical proteins. G7 possesses abundant putative virulence genes associated with adhesion, invasion, dissemination, anti-phagocytosis, and intracellular survival. Experimental studies showed that G7 was able to cause mortality in fish and mice following intramuscular/intraperitoneal injection, resist the killing effect of serum complement, and replicate in mouse macrophages and fish peripheral blood leukocytes. Taken together, our study indicates that G7 is a B. subtilis isolate with unique genetic features and can be lethal to vertebrate animals once being introduced into the animals by artificial means. These results provide the first insight into the potential harmfulness of deep-sea B. subtilis.
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Affiliation(s)
- Han-Jie Gu
- CAS Key Laboratory of Experimental Marine Biology, Center for Ocean Mega-Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China.,Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology, Qingdao, China.,College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Qing-Lei Sun
- CAS Key Laboratory of Experimental Marine Biology, Center for Ocean Mega-Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China.,Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology, Qingdao, China
| | - Jing-Chang Luo
- CAS Key Laboratory of Experimental Marine Biology, Center for Ocean Mega-Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China.,Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology, Qingdao, China.,College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Jian Zhang
- CAS Key Laboratory of Experimental Marine Biology, Center for Ocean Mega-Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China.,Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology, Qingdao, China
| | - Li Sun
- CAS Key Laboratory of Experimental Marine Biology, Center for Ocean Mega-Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China.,Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology, Qingdao, China
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Li R, Liang C, Jiang L, Yuan C, Huang M. Structural determination of group A Streptococcal surface dehydrogenase and characterization of its interaction with urokinase-type plasminogen activator receptor. Biochem Biophys Res Commun 2019; 510:539-544. [PMID: 30737033 DOI: 10.1016/j.bbrc.2019.01.102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 01/23/2019] [Indexed: 10/27/2022]
Abstract
Streptococcus pyogenes (group A Streptococcus, GAS) has caused a wide variety of human diseases. Its multifunctional surface dehydrogenase (SDH) is crucial for GAS life cycle. Furthermore, GAS infection into human pharyngeal cells has been previously shown to be mediated by the interaction between SDH and host urokinase-type plasminogen activator receptor (uPAR). However, the structural information of SDH remains to be elucidated and there are few detailed studies to characterize its interaction with uPAR. In-depth research on these issues will provide potential targets and strategies for combating GAS. Here, we prepared recombinant SDH tetramer in Escherichia coli BL21 (DE3) cells. After purification and crystallization, we determined its crystal structure at 1.74 Å. The unique characteristics might be potentially explored as drug targets or vaccine immunogen. We subsequently performed gel filtration chromatography, native-polyacrylamide gel electrophoresis (PAGE) and in vitro pull-down analyses. The results showed that their interaction was too weak to form stable complexes and the role of uPAR involved in GAS infection needs further demonstration. Altogether the current work provides the first view of SDH and deepens the knowledge of GAS infection.
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Affiliation(s)
- Rui Li
- Key Laboratory of Animal Immunology of the Ministry of Agriculture, Henan Provincial Key Laboratory of Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, 450002, Henan, China.
| | - Chenghui Liang
- College of Biological Science and Engineering, Fuzhou University, Fuzhou, 350108, Fujian, China.
| | - Longguang Jiang
- College of Chemistry, Fuzhou University, Fuzhou, 350116, Fujian, China.
| | - Cai Yuan
- College of Biological Science and Engineering, Fuzhou University, Fuzhou, 350108, Fujian, China.
| | - Mingdong Huang
- College of Chemistry, Fuzhou University, Fuzhou, 350116, Fujian, China.
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Hafner A, Kolbe U, Freund I, Castiglia V, Kovarik P, Poth T, Herster F, Weigand MA, Weber ANR, Dalpke AH, Eigenbrod T. Crucial Role of Nucleic Acid Sensing via Endosomal Toll-Like Receptors for the Defense of Streptococcus pyogenes in vitro and in vivo. Front Immunol 2019; 10:198. [PMID: 30846984 PMCID: PMC6394247 DOI: 10.3389/fimmu.2019.00198] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Accepted: 01/23/2019] [Indexed: 12/13/2022] Open
Abstract
Streptococcus pyogenes is a major human pathogen causing a variety of diseases ranging from common pharyngitis to life-threatening soft tissue infections and sepsis. Microbial nucleic acids, especially bacterial RNA, have recently been recognized as a major group of pathogen-associated molecular patterns (PAMPs) involved in the detection of Streptococcus pyogenes via endosomal Toll-like receptors (TLRs) in vitro. However, the individual contribution and cooperation between TLRs as well as cell-type and strain specific differences in dependency on nucleic acid detection during S. pyogenes infection in vitro have not been clarified in detail. Moreover, the role of particularly bacterial RNA for the defense of S. pyogenes infection in vivo remains poorly defined. In this study, we report that in all investigated innate immune cells involved in the resolution of bacterial infections, including murine macrophages, dendritic cells and neutrophils, recognition of S. pyogenes strain ATCC12344 is almost completely dependent on nucleic acid sensing via endosomal TLRs at lower MOIs, whereas at higher MOIs, detection via TLR2 plays an additional, yet redundant role. We further demonstrate that different S. pyogenes strains display a considerable inter-strain variability with respect to their nucleic acid dependent recognition. Moreover, TLR13-dependent recognition of S. pyogenes RNA is largely non-redundant in bone marrow-derived macrophages (BMDMs), but less relevant in neutrophils and bone marrow-derived myeloid dendritic cells (BMDCs) for the induction of an innate immune response in vitro. In vivo, we show that a loss of nucleic acid sensing blunts early recognition of S. pyogenes, leading to a reduced local containment of the bacterial infection with subsequent pronounced systemic inflammation at later time points. Thus, our results argue for a crucial role of nucleic acid sensing via endosomal TLRs in defense of S. pyogenes infection both in vitro and in vivo.
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Affiliation(s)
- Anna Hafner
- Department of Infectious Diseases, Medical Microbiology and Hygiene, Heidelberg University Hospital, Heidelberg, Germany
- Department of Anesthesiology, Heidelberg University Hospital, Heidelberg, Germany
| | - Ulrike Kolbe
- Department of Infectious Diseases, Medical Microbiology and Hygiene, Heidelberg University Hospital, Heidelberg, Germany
| | - Isabel Freund
- Department of Infectious Diseases, Medical Microbiology and Hygiene, Heidelberg University Hospital, Heidelberg, Germany
| | - Virginia Castiglia
- Max F. Perutz Laboratories, University of Vienna, Vienna Biocenter, Vienna, Austria
| | - Pavel Kovarik
- Max F. Perutz Laboratories, University of Vienna, Vienna Biocenter, Vienna, Austria
| | - Tanja Poth
- Center for Model System and Comparative Pathology, Institute of Pathology, Heidelberg University Hospital, Heidelberg, Germany
| | - Franziska Herster
- Department of Immunology, Interfaculty Institute of Cell Biology, Eberhard-Karls-University, Tübingen, Germany
| | - Markus A. Weigand
- Department of Anesthesiology, Heidelberg University Hospital, Heidelberg, Germany
| | - Alexander N. R. Weber
- Department of Immunology, Interfaculty Institute of Cell Biology, Eberhard-Karls-University, Tübingen, Germany
| | - Alexander H. Dalpke
- Department of Infectious Diseases, Medical Microbiology and Hygiene, Heidelberg University Hospital, Heidelberg, Germany
- Institute of Medical Microbiology and Hygiene, Technical University Dresden, Dresden, Germany
| | - Tatjana Eigenbrod
- Department of Infectious Diseases, Medical Microbiology and Hygiene, Heidelberg University Hospital, Heidelberg, Germany
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Kurosawa M, Oda M, Domon H, Isono T, Nakamura Y, Saitoh I, Hayasaki H, Yamaguchi M, Kawabata S, Terao Y. Streptococcus pyogenes CAMP factor promotes calcium ion uptake in RAW264.7 cells. Microbiol Immunol 2018; 62:617-623. [PMID: 30211957 DOI: 10.1111/1348-0421.12647] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 08/20/2018] [Accepted: 09/04/2018] [Indexed: 12/26/2022]
Abstract
Streptococcus pyogenes is a bacterium that causes systemic diseases such as pharyngitis and toxic shock syndrome. S. pyogenes produces molecules that inhibit the function of the human immune system, thus allowing growth and spread of the pathogen in tissues. It is known that S. pyogenes CAMP factor induces vacuolation in macrophages; however, the mechanism remains unclear. In the current study, the mechanism by which CAMP factor induces vacuolation in macrophages was investigated. CAMP factor was found to induce calcium ion uptake in murine macrophage RAW264.7 cells. In addition, EDTA inhibited calcium ion uptake and vacuolation in the cells. The L-type voltage-dependent calcium ion channel blockers nifedipine and verapamil reduced vacuolation. Furthermore, the phosphoinositide 3-kinase inhibitors LY294002 and wortmannin also inhibited the vacuolation induced by CAMP factor. Fluorescent microscopy revealed that clathrin localized to the vacuoles. These results suggest that the vacuolation is related to calcium ion uptake by RAW264.7 cells via L-type voltage-dependent calcium ion channels. Therefore, it was concluded that the vacuoles induced by S. pyogenes CAMP factor in macrophages are clathrin-dependent endosomes induced by activation of the phosphoinositide 3-kinase signaling pathway through calcium ion uptake.
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Affiliation(s)
- Mie Kurosawa
- Division of Microbiology and Infectious Diseases, Graduate School of Medical and Dental Sciences, Niigata University, 2-5274 Gakkocho-dori, Chuo-ku, Niigata 951-8514, Japan.,Division of Pediatric Dentistry, Graduate School of Medical and Dental Sciences, Niigata University, 2-5274 Gakkocho-dori, Chuo-ku, Niigata 951-8514, Japan
| | - Masataka Oda
- Division of Microbiology and Infectious Diseases, Graduate School of Medical and Dental Sciences, Niigata University, 2-5274 Gakkocho-dori, Chuo-ku, Niigata 951-8514, Japan.,Department of Microbiology and Infection Control Science, Kyoto Pharmaceutical University, 5 Misasagi, nakauchimachi, Yamashina-ku, Kyoto 607-8414, Japan
| | - Hisanori Domon
- Division of Microbiology and Infectious Diseases, Graduate School of Medical and Dental Sciences, Niigata University, 2-5274 Gakkocho-dori, Chuo-ku, Niigata 951-8514, Japan.,Research Center for Advanced Oral Science, Graduate School of Medical and Dental Sciences, Niigata University, 2-5274 Gakkocho-dori, Chuo-ku, Niigata 951-8514, Japan
| | - Toshihito Isono
- Division of Microbiology and Infectious Diseases, Graduate School of Medical and Dental Sciences, Niigata University, 2-5274 Gakkocho-dori, Chuo-ku, Niigata 951-8514, Japan
| | - Yuki Nakamura
- Division of Pediatric Dentistry, Graduate School of Medical and Dental Sciences, Niigata University, 2-5274 Gakkocho-dori, Chuo-ku, Niigata 951-8514, Japan
| | - Issei Saitoh
- Division of Pediatric Dentistry, Graduate School of Medical and Dental Sciences, Niigata University, 2-5274 Gakkocho-dori, Chuo-ku, Niigata 951-8514, Japan
| | - Haruaki Hayasaki
- Division of Pediatric Dentistry, Graduate School of Medical and Dental Sciences, Niigata University, 2-5274 Gakkocho-dori, Chuo-ku, Niigata 951-8514, Japan
| | - Masaya Yamaguchi
- Department of Oral and Molecular Microbiology, Graduate School of Dentistry, Osaka University, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Shigetada Kawabata
- Department of Oral and Molecular Microbiology, Graduate School of Dentistry, Osaka University, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Yutaka Terao
- Division of Microbiology and Infectious Diseases, Graduate School of Medical and Dental Sciences, Niigata University, 2-5274 Gakkocho-dori, Chuo-ku, Niigata 951-8514, Japan.,Research Center for Advanced Oral Science, Graduate School of Medical and Dental Sciences, Niigata University, 2-5274 Gakkocho-dori, Chuo-ku, Niigata 951-8514, Japan
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Wójcik M, Eleftheriadis N, Zwinderman MRH, Dömling ASS, Dekker FJ, Boersma YL. Identification of potential antivirulence agents by substitution-oriented screening for inhibitors of Streptococcus pyogenes sortase A. Eur J Med Chem 2018; 161:93-100. [PMID: 30343193 DOI: 10.1016/j.ejmech.2018.10.027] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Revised: 10/02/2018] [Accepted: 10/10/2018] [Indexed: 10/28/2022]
Abstract
Antimicrobial resistance resulting in ineffective treatment of infectious diseases is an increasing global problem, particularly in infections with pathogenic bacteria. In some bacteria, such as Streptococcus pyogenes, the pathogenicity is strongly linked to the attachment of virulence factors. Their attachment to the cellular membrane is a transpeptidation reaction, catalyzed by sortase enzymes. As such, sortases pose an interesting target for the development of new antivirulence strategies that could yield novel antimicrobial drugs. Using the substitution-oriented fragment screening (SOS) approach, we discovered a potent and specific inhibitor (C10) of sortase A from S. pyogenes. The inhibitor C10 showed high specificity towards S. pyogenes sortase A, with an IC50 value of 10 μM and a Kd of 60 μM. We envision that this inhibitor could be employed as a starting point for further exploration of sortase's potential as therapeutic target for antimicrobial drug development.
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Affiliation(s)
- Magdalena Wójcik
- University of Groningen, Groningen Research Institute of Pharmacy, Department of Chemical and Pharmaceutical Biology, Antonius Deusinglaan 1, 9713 AV, Groningen, the Netherlands.
| | - Nikolaos Eleftheriadis
- University of Groningen, Groningen Research Institute of Pharmacy, Department of Chemical and Pharmaceutical Biology, Antonius Deusinglaan 1, 9713 AV, Groningen, the Netherlands; University of Groningen, Molecular Microscopy Research Group, Zernike Institute for Advanced Materials, Nijenborgh 4, 9747 AG, Groningen, the Netherlands.
| | - Martijn R H Zwinderman
- University of Groningen, Groningen Research Institute of Pharmacy, Department of Chemical and Pharmaceutical Biology, Antonius Deusinglaan 1, 9713 AV, Groningen, the Netherlands.
| | - Alexander S S Dömling
- University of Groningen, Groningen Research Institute of Pharmacy, Department of Drug Design, Antonius Deusinglaan 1, 9713 AV, Groningen, the Netherlands.
| | - Frank J Dekker
- University of Groningen, Groningen Research Institute of Pharmacy, Department of Chemical and Pharmaceutical Biology, Antonius Deusinglaan 1, 9713 AV, Groningen, the Netherlands.
| | - Ykelien L Boersma
- University of Groningen, Groningen Research Institute of Pharmacy, Department of Chemical and Pharmaceutical Biology, Antonius Deusinglaan 1, 9713 AV, Groningen, the Netherlands.
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Langshaw EL, Pandey M, Good MF. Cellular interactions of covR/S mutant group A Streptococci. Microbes Infect 2018; 20:531-535. [DOI: 10.1016/j.micinf.2017.12.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2017] [Accepted: 12/11/2017] [Indexed: 11/28/2022]
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47
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Weckel A, Ahamada D, Bellais S, Méhats C, Plainvert C, Longo M, Poyart C, Fouet A. The N-terminal domain of the R28 protein promotes emm28 group A Streptococcus adhesion to host cells via direct binding to three integrins. J Biol Chem 2018; 293:16006-16018. [PMID: 30150299 DOI: 10.1074/jbc.ra118.004134] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Revised: 08/20/2018] [Indexed: 01/07/2023] Open
Abstract
Group A Streptococcus (GAS) is a human-specific pathogen responsible for a wide range of diseases, ranging from superficial to life-threatening invasive infections, including endometritis, and autoimmune sequelae. GAS strains express a vast repertoire of virulence factors that varies depending on the strain genotype, and many adhesin proteins that enable GAS to adhere to host cells are restricted to some genotypes. GAS emm28 is the third most prevalent genotype in invasive infections in France and is associated with gyneco-obstetrical infections. emm28 strains harbor R28, a cell wall-anchored surface protein that has previously been reported to promote adhesion to cervical epithelial cells. Here, using cellular and biochemical approaches, we sought to determine whether R28 supports adhesion also to other cells and to characterize its cognate receptor. We show that through its N-terminal domain, R28Nt, R28 promotes bacterial adhesion to both endometrial-epithelial and endometrial-stromal cells. R28Nt was further subdivided into two domains, and we found that both are involved in cell binding. R28Nt and both subdomains interacted directly with the laminin-binding α3β1, α6β1, and α6β4 integrins; interestingly, these bindings events did not require divalent cations. R28 is the first GAS adhesin reported to bind directly to integrins that are expressed in most epithelial cells. Finally, R28Nt also promoted binding to keratinocytes and pulmonary epithelial cells, suggesting that it may be involved in supporting the prevalence in invasive infections of the emm28 genotype.
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Affiliation(s)
- Antonin Weckel
- From the INSERM U1016, Institut Cochin.,CNRS UMR 8104, and.,Université Paris Descartes, UMR-S1016 Paris, France and
| | - Dorian Ahamada
- From the INSERM U1016, Institut Cochin.,CNRS UMR 8104, and.,Université Paris Descartes, UMR-S1016 Paris, France and
| | - Samuel Bellais
- From the INSERM U1016, Institut Cochin.,CNRS UMR 8104, and.,Université Paris Descartes, UMR-S1016 Paris, France and
| | - Céline Méhats
- From the INSERM U1016, Institut Cochin.,CNRS UMR 8104, and.,Université Paris Descartes, UMR-S1016 Paris, France and
| | - Céline Plainvert
- From the INSERM U1016, Institut Cochin.,CNRS UMR 8104, and.,Université Paris Descartes, UMR-S1016 Paris, France and.,the Centre National de Référence des Streptocoques and.,the Hôpitaux Universitaires Paris Centre, Institut Cochin, Assistance Publique Hôpitaux de Paris, 75014 Paris, France
| | - Magalie Longo
- From the INSERM U1016, Institut Cochin.,CNRS UMR 8104, and.,Université Paris Descartes, UMR-S1016 Paris, France and
| | - Claire Poyart
- From the INSERM U1016, Institut Cochin.,CNRS UMR 8104, and.,Université Paris Descartes, UMR-S1016 Paris, France and.,the Centre National de Référence des Streptocoques and.,the Hôpitaux Universitaires Paris Centre, Institut Cochin, Assistance Publique Hôpitaux de Paris, 75014 Paris, France
| | - Agnès Fouet
- From the INSERM U1016, Institut Cochin, .,CNRS UMR 8104, and.,Université Paris Descartes, UMR-S1016 Paris, France and.,the Centre National de Référence des Streptocoques and
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48
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Soh KY, Loh JMS, Proft T. Orthologues of Streptococcus pyogenes nuclease A (SpnA) and Streptococcal 5'-nucleotidase A (S5nA) found in Streptococcus iniae. J Biochem 2018; 164:165-171. [PMID: 29659850 DOI: 10.1093/jb/mvy039] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Accepted: 03/27/2018] [Indexed: 02/06/2023] Open
Abstract
Streptococcus pyogenes nuclease A (SpnA) and streptococcal 5' nucleosidase A (S5nA) are two recently described virulence factors from the human pathogen S. pyogenes. In vitro studies have shown that SpnA is a nuclease that cleaves ssDNA and dsDNA, including the DNA backbone of neutrophil extracellular traps. S5nA was shown to hydrolyse AMP and ADP, but not ATP, to generate the immunomodulatory molecule adenosine. S5nA also generates the macrophage-toxic deoxyadenosine from dAMP. However, detailed in vivo studies of the two enzymes have been hampered by difficulties with using current animal models for this exclusive human pathogen. Here we report the identification of two novel enzymes from the fish pathogen Streptococcus iniae that show similarities to SpnA and S5nA in amino acid sequence, protein domain structure and biochemical properties. We propose that SpnAi and S5nAi are orthologues of the S. pyogenes enzymes, providing a rationale to analyse the in vivo function of the two enzymes using a S. iniae-zebrafish infection model.
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Affiliation(s)
- Kar Yan Soh
- Department of Molecular Medicine & Pathology, School of Medical Sciences
| | - Jacelyn Mei San Loh
- Department of Molecular Medicine & Pathology, School of Medical Sciences.,Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Thomas Proft
- Department of Molecular Medicine & Pathology, School of Medical Sciences.,Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
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Kobayashi SD, Malachowa N, DeLeo FR. Neutrophils and Bacterial Immune Evasion. J Innate Immun 2018; 10:432-441. [PMID: 29642066 DOI: 10.1159/000487756] [Citation(s) in RCA: 117] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 02/14/2018] [Indexed: 12/31/2022] Open
Abstract
Neutrophils are an important component of the innate immune system and provide a front line of defense against bacterial infection. Although most bacteria are killed readily by neutrophils, some bacterial pathogens have the capacity to circumvent destruction by these host leukocytes. The ability of bacterial pathogens to avoid killing by neutrophils often involves multiple attributes or characteristics, including the production of virulence molecules. These molecules are diverse in composition and function, and collectively have the potential to alter or inhibit neutrophil recruitment, phagocytosis, bactericidal activity, and/or apoptosis. Here, we review the ability of bacteria to target these processes.
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50
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Streptococcal pharyngitis and rheumatic heart disease: the superantigen hypothesis revisited. INFECTION GENETICS AND EVOLUTION 2018. [PMID: 29530660 DOI: 10.1016/j.meegid.2018.03.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Streptococcus pyogenes is a human-specific and globally prominent bacterial pathogen that despite causing numerous human infections, this bacterium is normally found in an asymptomatic carrier state. This review provides an overview of both bacterial and human factors that likely play an important role in nasopharyngeal colonization and pharyngitis, as well as the development of acute rheumatic fever and rheumatic heart disease. Here we highlight a recently described role for bacterial superantigens in promoting acute nasopharyngeal infection, and discuss how these immune system activating toxins could be crucial to initiate the autoimmune process in rheumatic heart disease.
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