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Del Pinto R, Ferri C, Giannoni M, Cominelli F, Pizarro TT, Pietropaoli D. Meta-analysis of oral microbiome reveals sex-based diversity in biofilms during periodontitis. JCI Insight 2024; 9:e171311. [PMID: 39253976 PMCID: PMC11385077 DOI: 10.1172/jci.insight.171311] [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: 04/07/2023] [Accepted: 07/25/2024] [Indexed: 09/11/2024] Open
Abstract
Sex is an often overlooked, yet compulsory, biological variable when performing biomedical research. Periodontitis is a common yet progressively debilitating chronic inflammatory disorder affecting the tissues supporting teeth that ultimately leads to tooth loss if left untreated. The incidence of periodontitis is sex biased, with increased prevalence in males compared with females but with unknown etiology. We performed a sex-specific meta-analysis using publicly available oral microbiome data from different sampling sites of patients with periodontitis and periodontally healthy controls; sex balance was established for each periodontal health condition. Our results show sex-based diversity in oral biofilms of individuals with periodontitis but not in their saliva, with increased abundance of several periodontal pathogens in subgingival plaques from females compared with males. We devised a quantitative measure, uniquely defined as the Microsexome Index (MSI), which indicates that sexual dimorphism in subgingival bacterial composition is a distinct feature of reduced microbial diversity during periodontitis but not under healthy conditions. In addition, we found that smoking exacerbates microsexome diversity in supragingival biofilms, particularly during periodontitis. Taken together, we provide insights regarding sex-based diversity in periodontitis, a disease with multiorgan associations, and provide the rationale for further mechanistic, diagnostic, and therapeutic studies.
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Affiliation(s)
- Rita Del Pinto
- San Salvatore Hospital, Department of Clinical Medicine, Public Health, Life and Environmental Sciences, University of L’Aquila, L’Aquila, Italy
- Department of Pathology, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA
- Oral DISeases and SYstemic interactions study group (ODISSY group), L’Aquila, Italy (detailed in Supplemental Acknowledgments)
| | - Claudio Ferri
- San Salvatore Hospital, Department of Clinical Medicine, Public Health, Life and Environmental Sciences, University of L’Aquila, L’Aquila, Italy
- Oral DISeases and SYstemic interactions study group (ODISSY group), L’Aquila, Italy (detailed in Supplemental Acknowledgments)
| | - Mario Giannoni
- Oral DISeases and SYstemic interactions study group (ODISSY group), L’Aquila, Italy (detailed in Supplemental Acknowledgments)
- Center of Oral Diseases, Prevention and Translational Research, Dental Clinic, Department of Clinical Medicine, Public Health, Life and Environmental Sciences, University of L’Aquila, L’Aquila, Italy
| | - Fabio Cominelli
- Department of Medicine, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA
| | - Theresa T. Pizarro
- Department of Pathology, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA
| | - Davide Pietropaoli
- Oral DISeases and SYstemic interactions study group (ODISSY group), L’Aquila, Italy (detailed in Supplemental Acknowledgments)
- Center of Oral Diseases, Prevention and Translational Research, Dental Clinic, Department of Clinical Medicine, Public Health, Life and Environmental Sciences, University of L’Aquila, L’Aquila, Italy
- Department of Medicine, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA
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Irie K, Azuma T, Tomofuji T, Yamamoto T. Exploring the Role of IL-17A in Oral Dysbiosis-Associated Periodontitis and Its Correlation with Systemic Inflammatory Disease. Dent J (Basel) 2023; 11:194. [PMID: 37623290 PMCID: PMC10453731 DOI: 10.3390/dj11080194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 08/01/2023] [Accepted: 08/09/2023] [Indexed: 08/26/2023] Open
Abstract
Oral microbiota play a pivotal role in maintaining homeostasis, safeguarding the oral cavity, and preventing the onset of disease. Oral dysbiosis has the potential to trigger pro-inflammatory effects and immune dysregulation, which can have a negative impact on systemic health. It is regarded as a key etiological factor for periodontitis. The emergence and persistence of oral dysbiosis have been demonstrated to mediate inflammatory pathology locally and at distant sites. The heightened inflammation observed in oral dysbiosis is dependent upon the secretion of interleukin-17A (IL-17A) by various innate and adaptive immune cells. IL-17A has been found to play a significant role in host defense mechanisms by inducing antibacterial peptides, recruiting neutrophils, and promoting local inflammation via cytokines and chemokines. This review seeks to present the current knowledge on oral dysbiosis and its prevention, as well as the underlying role of IL-17A in periodontitis induced by oral dysbiosis and its impact on systemic inflammatory disease.
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Affiliation(s)
- Koichiro Irie
- Department of Preventive Dentistry and Dental Public Health, Kanagawa Dental University, Yokosuka 238-8580, Japan;
| | - Tetsuji Azuma
- Department of Community Oral Health, School of Dentistry, Asahi University, Mizuho 501-0296, Japan; (T.A.); (T.T.)
| | - Takaaki Tomofuji
- Department of Community Oral Health, School of Dentistry, Asahi University, Mizuho 501-0296, Japan; (T.A.); (T.T.)
| | - Tatsuo Yamamoto
- Department of Preventive Dentistry and Dental Public Health, Kanagawa Dental University, Yokosuka 238-8580, Japan;
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3
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Pandey SD, Perpich JD, Stocke KS, Mansfield JM, Kikuchi Y, Yakoumatos L, Muszyński A, Azadi P, Tettelin H, Whiteley M, Uriarte SM, Bagaitkar J, Vickerman M, Lamont RJ. Impact of Polymicrobial Infection on Fitness of Streptococcus gordonii In Vivo. mBio 2023; 14:e0065823. [PMID: 37042761 PMCID: PMC10294625 DOI: 10.1128/mbio.00658-23] [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: 03/17/2023] [Accepted: 03/21/2023] [Indexed: 04/13/2023] Open
Abstract
Pathogenic microbial ecosystems are often polymicrobial, and interbacterial interactions drive emergent properties of these communities. In the oral cavity, Streptococcus gordonii is a foundational species in the development of plaque biofilms, which can contribute to periodontal disease and, after gaining access to the bloodstream, target remote sites such as heart valves. Here, we used a transposon sequencing (Tn-Seq) library of S. gordonii to identify genes that influence fitness in a murine abscess model, both as a monoinfection and as a coinfection with an oral partner species, Porphyromonas gingivalis. In the context of a monoinfection, conditionally essential genes were widely distributed among functional pathways. Coinfection with P. gingivalis almost completely changed the nature of in vivo gene essentiality. Community-dependent essential (CoDE) genes under the coinfection condition were primarily related to DNA replication, transcription, and translation, indicating that robust growth and replication are required to survive with P. gingivalis in vivo. Interestingly, a group of genes in an operon encoding streptococcal receptor polysaccharide (RPS) were associated with decreased fitness of S. gordonii in a coinfection with P. gingivalis. Individual deletion of two of these genes (SGO_2020 and SGO_2024) resulted in the loss of RPS production by S. gordonii and increased susceptibility to killing by neutrophils. P. gingivalis protected the RPS mutants by inhibiting neutrophil recruitment, degranulation, and neutrophil extracellular trap (NET) formation. These results provide insight into genes and functions that are important for S. gordonii survival in vivo and the nature of polymicrobial synergy with P. gingivalis. Furthermore, we show that RPS-mediated immune protection in S. gordonii is dispensable and detrimental in the presence of a synergistic partner species that can interfere with neutrophil killing mechanisms. IMPORTANCE Bacteria responsible for diseases originating at oral mucosal membranes assemble into polymicrobial communities. However, we know little regarding the fitness determinants of the organisms that initiate community formation. Here, we show that the extracellular polysaccharide of Streptococcus gordonii, while important for streptococcal survival as a monoinfection, is detrimental to survival in the context of a coinfection with Porphyromonas gingivalis. We found that the presence of P. gingivalis compensates for immune protective functions of extracellular polysaccharide, rendering production unnecessary. The results show that fitness determinants of bacteria in communities differ substantially from those of individual species in isolation. Furthermore, constituents of communities can undertake activities that relieve the burden of energetically costly biosynthetic reactions on partner species.
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Affiliation(s)
- Satya D. Pandey
- Department of Oral Immunology and Infectious Diseases, University of Louisville, Louisville, Kentucky, USA
| | - John D. Perpich
- Department of Oral Immunology and Infectious Diseases, University of Louisville, Louisville, Kentucky, USA
- Department of Pharmaceutical Science, Sullivan University, Louisville, Kentucky, USA
| | - Kendall S. Stocke
- Department of Oral Immunology and Infectious Diseases, University of Louisville, Louisville, Kentucky, USA
| | - Jillian M. Mansfield
- Department of Oral Biology, School of Dental Medicine, University at Buffalo, Buffalo, New York, USA
| | - Yuichiro Kikuchi
- Department of Oral Immunology and Infectious Diseases, University of Louisville, Louisville, Kentucky, USA
| | - Lan Yakoumatos
- Department of Oral Immunology and Infectious Diseases, University of Louisville, Louisville, Kentucky, USA
| | - Artur Muszyński
- Department of Biochemistry and Molecular Biology, University of Georgia, Athens, Georgia, USA
| | - Parastoo Azadi
- Department of Biochemistry and Molecular Biology, University of Georgia, Athens, Georgia, USA
| | - Hervé Tettelin
- Department of Microbiology and Immunology, Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Marvin Whiteley
- School of Biological Sciences, Center for Microbial Dynamics and Infection, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Silvia M. Uriarte
- Department of Oral Immunology and Infectious Diseases, University of Louisville, Louisville, Kentucky, USA
| | - Juhi Bagaitkar
- Center for Microbial Pathogenesis, Nationwide Children's Hospital, Columbus, Ohio, USA
- Department of Pediatrics, The Ohio State College of Medicine, Columbus, Ohio, USA
| | - Margaret Vickerman
- Department of Oral Biology, School of Dental Medicine, University at Buffalo, Buffalo, New York, USA
| | - Richard J. Lamont
- Department of Oral Immunology and Infectious Diseases, University of Louisville, Louisville, Kentucky, USA
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4
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Uriarte SM, Hajishengallis G. Neutrophils in the periodontium: Interactions with pathogens and roles in tissue homeostasis and inflammation. Immunol Rev 2023; 314:93-110. [PMID: 36271881 PMCID: PMC10049968 DOI: 10.1111/imr.13152] [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] [Indexed: 11/28/2022]
Abstract
Neutrophils are of key importance in periodontal health and disease. In their absence or when they are functionally defective, as occurs in certain congenital disorders, affected individuals develop severe forms of periodontitis in early age. These observations imply that the presence of immune-competent neutrophils is essential to homeostasis. However, the presence of supernumerary or hyper-responsive neutrophils, either because of systemic priming or innate immune training, leads to imbalanced host-microbe interactions in the periodontium that culminate in dysbiosis and inflammatory tissue breakdown. These disease-provoking imbalanced interactions are further exacerbated by periodontal pathogens capable of subverting neutrophil responses to their microbial community's benefit and the host's detriment. This review attempts a synthesis of these findings for an integrated view of the neutrophils' ambivalent role in periodontal disease and, moreover, discusses how some of these concepts underpin the development of novel therapeutic approaches to treat periodontal disease.
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Affiliation(s)
- Silvia M. Uriarte
- Department of Oral Immunology and Infectious Diseases, School of Dentistry, University of Louisville, Louisville, KY, USA
| | - George Hajishengallis
- Department of Basic and Translational Sciences, Laboratory of Innate Immunity and Inflammation, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, USA
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Holyoak GR, Premathilake HU, Lyman CC, Sones JL, Gunn A, Wieneke X, DeSilva U. The healthy equine uterus harbors a distinct core microbiome plus a rich and diverse microbiome that varies with geographical location. Sci Rep 2022; 12:14790. [PMID: 36042332 PMCID: PMC9427864 DOI: 10.1038/s41598-022-18971-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Accepted: 08/23/2022] [Indexed: 02/05/2023] Open
Abstract
The goal of this study was to understand the composition and existence of the resident uterine microbiome in healthy mares and to establish the presence of a core microbiome for the healthy equine uterus. We analyzed the microbiomes of 35 healthy mares that are long-time residents of three farms in Oklahoma, Louisiana, and Australia as well as that of 19 mares purchased from scattered owners in the Southern Mid-Western states of the United States. Over 6 million paired-end reads of the V4 region of the 16S rRNA gene were obtained resulting in 19,542 unique Amplicon Sequence Variants (ASVs). ASVs were assigned to 17 known phyla and 213 known genera. Most abundant genera across all animals were Pseudomonas (27%) followed by Lonsdalea (8%), Lactobacillus (7.5%), Escherichia/Shigella (4.5%), and Prevotella (3%). Oklahoma and Louisiana samples were dominated by Pseudomonas (75%). Lonsdalea (28%) was the most abundant genus in the Australian samples but was not found in any other region. Microbial diversity, richness, and evenness of the equine uterine microbiome is largely dependent on the geographical location of the animal. However, we observed a core uterine microbiome consisting of Lactobacillus, Escherichia/Shigella, Streptococcus, Blautia, Staphylococcus, Klebsiella, Acinetobacter, and Peptoanaerobacter.
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Affiliation(s)
- G. R. Holyoak
- grid.65519.3e0000 0001 0721 7331Department of Veterinary Clinical Sciences, Oklahoma State University, Stillwater, OK USA
| | - H. U. Premathilake
- grid.65519.3e0000 0001 0721 7331Department of Animal and Food Sciences, Oklahoma State University, Stillwater, OK USA
| | - C. C. Lyman
- grid.252546.20000 0001 2297 8753College of Veterinary Medicine, Auburn University, Auburn, AL USA
| | - J. L. Sones
- grid.64337.350000 0001 0662 7451School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA USA
| | - A. Gunn
- grid.1037.50000 0004 0368 0777School of Agricultural, Environmental and Veterinary Sciences and Gulbali Institute, Charles Sturt University, Wagga Wagga, NSW Australia
| | - X. Wieneke
- grid.65519.3e0000 0001 0721 7331Department of Animal and Food Sciences, Oklahoma State University, Stillwater, OK USA ,grid.16753.360000 0001 2299 3507Present Address: Department of Pathology and Laboratory Medicine; Center for Genomics, Anne and Robert H. Lurie Children′s Hospital, Northwestern Feinberg School of Medicine, Chicago, IL USA
| | - U. DeSilva
- grid.65519.3e0000 0001 0721 7331Department of Animal and Food Sciences, Oklahoma State University, Stillwater, OK USA
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McLeish KR, Shrestha R, Vashishta A, Rane MJ, Barati MT, Brier ME, Lau MG, Hu X, Chen O, Wessel CR, Spalding T, Bush SE, Ijemere K, Hopkins CD, Cooke EA, Tandon S, Manning T, Uriarte SM, Huang J, Yan J. Differential Functional Responses of Neutrophil Subsets in Severe COVID-19 Patients. Front Immunol 2022; 13:879686. [PMID: 35711435 PMCID: PMC9197482 DOI: 10.3389/fimmu.2022.879686] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2022] [Accepted: 05/02/2022] [Indexed: 12/25/2022] Open
Abstract
Neutrophils play a significant role in determining disease severity following SARS-CoV-2 infection. Gene and protein expression defines several neutrophil clusters in COVID-19, including the emergence of low density neutrophils (LDN) that are associated with severe disease. The functional capabilities of these neutrophil clusters and correlation with gene and protein expression are unknown. To define host defense and immunosuppressive functions of normal density neutrophils (NDN) and LDN from COVID-19 patients, we recruited 64 patients with severe COVID-19 and 26 healthy donors (HD). Phagocytosis, respiratory burst activity, degranulation, neutrophil extracellular trap (NET) formation, and T-cell suppression in those neutrophil subsets were measured. NDN from severe/critical COVID-19 patients showed evidence of priming with enhanced phagocytosis, respiratory burst activity, and degranulation of secretory vesicles and gelatinase and specific granules, while NET formation was similar to HD NDN. COVID LDN response was impaired except for enhanced NET formation. A subset of COVID LDN with intermediate CD16 expression (CD16Int LDN) promoted T cell proliferation to a level similar to HD NDN, while COVID NDN and the CD16Hi LDN failed to stimulate T-cell activation. All 3 COVID-19 neutrophil populations suppressed stimulation of IFN-γ production, compared to HD NDN. We conclude that NDN and LDN from COVID-19 patients possess complementary functional capabilities that may act cooperatively to determine disease severity. We predict that global neutrophil responses that induce COVID-19 ARDS will vary depending on the proportion of neutrophil subsets.
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Affiliation(s)
- Kenneth R. McLeish
- Division of Nephrology and Hypertension, Department of Medicine, University of Louisville, KY, United States
- *Correspondence: Kenneth R. McLeish, ; Jun Yan,
| | - Rejeena Shrestha
- Department of Microbiology and Immunology, University of Louisville, KY, United States
| | - Aruna Vashishta
- Department of Oral Immunology and Infectious Diseases, School of Dentistry, University of Louisville, KY, United States
| | - Madhavi J. Rane
- Division of Nephrology and Hypertension, Department of Medicine, University of Louisville, KY, United States
| | - Michelle T. Barati
- Division of Nephrology and Hypertension, Department of Medicine, University of Louisville, KY, United States
| | - Michael E. Brier
- Division of Nephrology and Hypertension, Department of Medicine, University of Louisville, KY, United States
| | - Mario Gutierrez Lau
- Department of Oral Immunology and Infectious Diseases, School of Dentistry, University of Louisville, KY, United States
| | - Xiaoling Hu
- Division of Immunotherapy, The Hiram C. Polk, Jr., MD Department of Surgery, Immuno-Oncology Program, Brown Cancer Center, University of Louisville, Louisville, KY, United States
| | - Oscar Chen
- Department of Anesthesiology and Perioperative Medicine, University of Louisville, KY, United States
| | - Caitlin R. Wessel
- Department of Anesthesiology and Perioperative Medicine, University of Louisville, KY, United States
| | - Travis Spalding
- Department of Anesthesiology and Perioperative Medicine, University of Louisville, KY, United States
| | - Sarah E. Bush
- Department of Anesthesiology and Perioperative Medicine, University of Louisville, KY, United States
| | - Kenechi Ijemere
- Department of Anesthesiology and Perioperative Medicine, University of Louisville, KY, United States
| | - C. Danielle Hopkins
- Department of Anesthesiology and Perioperative Medicine, University of Louisville, KY, United States
| | - Elizabeth A. Cooke
- Department of Anesthesiology and Perioperative Medicine, University of Louisville, KY, United States
| | - Shweta Tandon
- Division of Nephrology and Hypertension, Department of Medicine, University of Louisville, KY, United States
| | - Terri Manning
- Division of Nephrology and Hypertension, Department of Medicine, University of Louisville, KY, United States
| | - Silvia M. Uriarte
- Department of Oral Immunology and Infectious Diseases, School of Dentistry, University of Louisville, KY, United States
| | - Jiapeng Huang
- Department of Anesthesiology and Perioperative Medicine, University of Louisville, KY, United States
| | - Jun Yan
- Department of Microbiology and Immunology, University of Louisville, KY, United States
- Division of Immunotherapy, The Hiram C. Polk, Jr., MD Department of Surgery, Immuno-Oncology Program, Brown Cancer Center, University of Louisville, Louisville, KY, United States
- *Correspondence: Kenneth R. McLeish, ; Jun Yan,
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Prucsi Z, Płonczyńska A, Potempa J, Sochalska M. Uncovering the Oral Dysbiotic Microbiota as Masters of Neutrophil Responses in the Pathobiology of Periodontitis. Front Microbiol 2021; 12:729717. [PMID: 34707586 PMCID: PMC8542842 DOI: 10.3389/fmicb.2021.729717] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Accepted: 09/14/2021] [Indexed: 12/24/2022] Open
Abstract
Numerous bacterial species participate in the shift of the oral microbiome from beneficial to dysbiotic. The biggest challenge lying ahead of microbiologists, immunologists and dentists is the fact that the bacterial species act differently, although usually synergistically, on the host immune cells, including neutrophils, and on the surrounding tissues, making the investigation of single factors challenging. As biofilm is a complex community, the members interact with each other, which can be a key issue in future studies designed to develop effective treatments. To understand how a patient gets to the stage of the late-onset (previously termed chronic) periodontitis or develops other, in some cases life-threatening, diseases, it is crucial to identify the microbial composition of the biofilm and the mechanisms behind its pathogenicity. The members of the red complex (Porphyromonas gingivalis, Treponema denticola, and Tannerella forsythia) have long been associated as the cause of periodontitis and stayed in the focus of research. However, novel techniques, such as 16S clonal analysis, demonstrated that the oral microbiome diversity is greater than ever expected and it opened a new era in periodontal research. This review aims to summarize the current knowledge concerning bacterial participation beyond P. gingivalis and the red complex in periodontal inflammation mediated by neutrophils and to spread awareness about the associated diseases and pathological conditions.
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Affiliation(s)
- Zsombor Prucsi
- Department of Microbiology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland
| | - Alicja Płonczyńska
- Department of Microbiology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland
| | - Jan Potempa
- Department of Microbiology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland
- Department of Oral Immunity and Infectious Diseases, University of Louisville School of Dentistry, Louisville, KY, United States
| | - Maja Sochalska
- Department of Microbiology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland
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Miralda I, Uriarte SM. Periodontal Pathogens' strategies disarm neutrophils to promote dysregulated inflammation. Mol Oral Microbiol 2020; 36:103-120. [PMID: 33128827 PMCID: PMC8048607 DOI: 10.1111/omi.12321] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 10/16/2020] [Accepted: 10/28/2020] [Indexed: 12/26/2022]
Abstract
Periodontitis is an irreversible, chronic inflammatory disease where inflammophilic pathogenic microbial communities accumulate in the gingival crevice. Neutrophils are a major component of the innate host response against bacterial challenge, and under homeostatic conditions, their microbicidal functions typically protect the host against periodontitis. However, a number of periodontal pathogens developed survival strategies to evade neutrophil microbicidal functions while promoting inflammation, which provides a source of nutrients for bacterial growth. Research on periodontal pathogens has largely focused on a few established species: Tannerella forsythia, Treponema denticola, Fusobacterium nucleatum, Aggregatibacter actinomycetemcomitans, and Porphyromonas gingivalis. However, advances in culture-independent techniques have facilitated the identification of new bacterial species in periodontal lesions, such as the two Gram-positive anaerobes, Filifactor alocis and Peptoanaerobacter stomatis, whose characterization of pathogenic potential has not been fully described. Additionally, there is not a full understanding of the pathogenic mechanisms used against neutrophils by organisms that are abundant in periodontal lesions. This presents a substantial barrier to the development of new approaches to prevent or ameliorate the disease. In this review, we first summarize the neutrophil functions affected by the established periodontal pathogens listed above, denoting unknown areas that still merit a closer look. Then, we review the literature on neutrophil functions and the emerging periodontal pathogens, F. alocis and P. stomatis, comparing the effects of the emerging microbes to that of established pathogens, and speculate on the contribution of these putative pathogens to the progression of periodontal disease.
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Affiliation(s)
- Irina Miralda
- Department of Oral Immunology and Infectious Diseases, School of Dentistry, University of Louisville, Louisville, KY, USA
| | - Silvia M Uriarte
- Department of Oral Immunology and Infectious Diseases, School of Dentistry, University of Louisville, Louisville, KY, USA
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Affiliation(s)
- Kara R. Eichelberger
- Department of Microbiology and Immunology, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - William E. Goldman
- Department of Microbiology and Immunology, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
- * E-mail:
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10
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Miralda I, Klaes CK, Graham JE, Uriarte SM. Human Neutrophil Granule Exocytosis in Response to Mycobacterium smegmatis. Pathogens 2020; 9:pathogens9020123. [PMID: 32075233 PMCID: PMC7169382 DOI: 10.3390/pathogens9020123] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Revised: 02/05/2020] [Accepted: 02/12/2020] [Indexed: 02/06/2023] Open
Abstract
Mycobacterium smegmatis rarely causes disease in the immunocompetent, but reported cases of soft tissue infection describe abscess formation requiring surgical debridement for resolution. Neutrophils are the first innate immune cells to accumulate at sites of bacterial infection, where reactive oxygen species and proteolytic enzymes are used to kill microbial invaders. As these phagocytic cells play central roles in protection from most bacteria, we assessed human neutrophil phagocytosis and granule exocytosis in response to serum opsonized or non-opsonized M. smegmatis mc2. Although phagocytosis was enhanced by serum opsonization, M. smegmatis did not induce exocytosis of secretory vesicles or azurophilic granules at any time point tested, with or without serum opsonization. At early time points, opsonized M. smegmatis induced significant gelatinase granule exocytosis compared to non-opsonized bacteria. Differences in granule release between opsonized and non-opsonized M. smegmatis decreased in magnitude over the time course examined, with bacteria also evoking specific granule exocytosis by six hours after addition to cultured primary single-donor human neutrophils. Supernatants from neutrophils challenged with opsonized M. smegmatis were able to digest gelatin, suggesting that complement and gelatinase granule exocytosis can contribute to neutrophil-mediated tissue damage seen in these rare soft tissue infections.
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Affiliation(s)
- Irina Miralda
- Department of Microbiology & Immunology, School of Medicine, University of Louisville, 505 S. Hancock St., Louisville, KY 40202, USA;
| | - Christopher K. Klaes
- Department of Medicine, School of Medicine, University of Louisville, 570 S. Preston St., Louisville, KY 40202, USA;
| | - James E. Graham
- Department of Microbiology & Immunology, School of Medicine, University of Louisville, 505 S. Hancock St., Louisville, KY 40202, USA;
- Correspondence: (J.E.G.); (S.M.U.); Tel.: +1-502-852-2781 (J.E.G.); +1-502-852-1396 (S.M.U.)
| | - Silvia M. Uriarte
- Department of Microbiology & Immunology, School of Medicine, University of Louisville, 505 S. Hancock St., Louisville, KY 40202, USA;
- Department of Medicine, School of Medicine, University of Louisville, 570 S. Preston St., Louisville, KY 40202, USA;
- Correspondence: (J.E.G.); (S.M.U.); Tel.: +1-502-852-2781 (J.E.G.); +1-502-852-1396 (S.M.U.)
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11
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Vashishta A, Jimenez-Flores E, Klaes CK, Tian S, Miralda I, Lamont RJ, Uriarte SM. Putative Periodontal Pathogens, Filifactor Alocis and Peptoanaerobacter Stomatis, Induce Differential Cytokine and Chemokine Production by Human Neutrophils. Pathogens 2019; 8:pathogens8020059. [PMID: 31052371 PMCID: PMC6630776 DOI: 10.3390/pathogens8020059] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Revised: 04/17/2019] [Accepted: 04/26/2019] [Indexed: 01/23/2023] Open
Abstract
Periodontitis is a highly prevalent infectious disease that affects ~ 50% of the adults in the USA alone. Two Gram-positive anaerobic oral bacteria, Filifactor alocis and Peptoanaerobacterstomatis, have emerged as important periodontal pathogens. Neutrophils are a major component of the innate host response in the gingival tissue, and the contribution of neutrophil-derived cytokines and chemokines plays a central role in disease progression. The pattern of cytokines and chemokines released by human neutrophils upon stimulation with newly appreciated periodontal bacteria compared to the keystone oral pathogen Porphyromonas gingivalis was investigated. Our results showed that both F. alocis and P. stomatis triggered TLR2/6 activation. F. alocis induced significant changes in gene expression of cytokines and chemokines in human neutrophils compared to unstimulated cells. However, except for IL-1ra, neutrophils released lower levels of cytokines and chemokines in response to F. alocis compared to P. stomatis. Furthermore, bacteria-free conditioned supernatant collected from neutrophils challenged with P. stomatis, but not from P. gingivalis or F. alocis, was chemotactic towards both neutrophils and monocytes. Elucidating stimuli-specific modulation of human neutrophil effector functions in the context of dysbiotic microbial community constituents provides valuable information for understanding the pathogenesis of periodontal diseases.
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Affiliation(s)
- Aruna Vashishta
- Department of Medicine, School of Medicine, University of Louisville, 570 S. Preston St., Louisville, KY 40202, USA.
| | - Emeri Jimenez-Flores
- Department of Medicine, School of Medicine, University of Louisville, 570 S. Preston St., Louisville, KY 40202, USA.
- Department of Oral Immunology and Infectious Diseases, School of Dentistry, University of Louisville, 570 S. Preston St., Louisville, KY 40202, USA.
| | - Christopher K Klaes
- Department of Medicine, School of Medicine, University of Louisville, 570 S. Preston St., Louisville, KY 40202, USA.
| | - Shifu Tian
- Department of Medicine, School of Medicine, University of Louisville, 570 S. Preston St., Louisville, KY 40202, USA.
| | - Irina Miralda
- Department of Microbiology & Immunology, School of Medicine, University of Louisville, 505 S. Hancock St., Louisville, KY 40202, USA.
| | - Richard J Lamont
- Department of Oral Immunology and Infectious Diseases, School of Dentistry, University of Louisville, 570 S. Preston St., Louisville, KY 40202, USA.
| | - Silvia M Uriarte
- Department of Medicine, School of Medicine, University of Louisville, 570 S. Preston St., Louisville, KY 40202, USA.
- Department of Oral Immunology and Infectious Diseases, School of Dentistry, University of Louisville, 570 S. Preston St., Louisville, KY 40202, USA.
- Department of Microbiology & Immunology, School of Medicine, University of Louisville, 505 S. Hancock St., Louisville, KY 40202, USA.
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12
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Stegelmeier AA, van Vloten JP, Mould RC, Klafuric EM, Minott JA, Wootton SK, Bridle BW, Karimi K. Myeloid Cells during Viral Infections and Inflammation. Viruses 2019; 11:E168. [PMID: 30791481 PMCID: PMC6410039 DOI: 10.3390/v11020168] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Revised: 02/15/2019] [Accepted: 02/16/2019] [Indexed: 12/11/2022] Open
Abstract
Myeloid cells represent a diverse range of innate leukocytes that are crucial for mounting successful immune responses against viruses. These cells are responsible for detecting pathogen-associated molecular patterns, thereby initiating a signaling cascade that results in the production of cytokines such as interferons to mitigate infections. The aim of this review is to outline recent advances in our knowledge of the roles that neutrophils and inflammatory monocytes play in initiating and coordinating host responses against viral infections. A focus is placed on myeloid cell development, trafficking and antiviral mechanisms. Although known for promoting inflammation, there is a growing body of literature which demonstrates that myeloid cells can also play critical regulatory or immunosuppressive roles, especially following the elimination of viruses. Additionally, the ability of myeloid cells to control other innate and adaptive leukocytes during viral infections situates these cells as key, yet under-appreciated mediators of pathogenic inflammation that can sometimes trigger cytokine storms. The information presented here should assist researchers in integrating myeloid cell biology into the design of novel and more effective virus-targeted therapies.
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Affiliation(s)
- Ashley A Stegelmeier
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, ON N1G 2W1, Canada.
| | - Jacob P van Vloten
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, ON N1G 2W1, Canada.
| | - Robert C Mould
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, ON N1G 2W1, Canada.
| | - Elaine M Klafuric
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, ON N1G 2W1, Canada.
| | - Jessica A Minott
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, ON N1G 2W1, Canada.
| | - Sarah K Wootton
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, ON N1G 2W1, Canada.
| | - Byram W Bridle
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, ON N1G 2W1, Canada.
| | - Khalil Karimi
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, ON N1G 2W1, Canada.
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13
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Miralda I, Vashishta A, Uriarte SM. Neutrophil Interaction with Emerging Oral Pathogens: A Novel View of the Disease Paradigm. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1197:165-178. [PMID: 31732941 DOI: 10.1007/978-3-030-28524-1_12] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Periodontitis is a multifactorial chronic inflammatory infectious disease that compromises the integrity of tooth-supporting tissues. The disease progression depends on the disruption of host-microbe homeostasis in the periodontal tissue. This disruption is marked by a shift in the composition of the polymicrobial oral community from a symbiotic to a dysbiotic, more complex community that is capable of evading killing while promoting inflammation. Neutrophils are the main phagocytic cell in the periodontal pocket, and the outcome of the interaction with the oral microbiota is an important determinant of oral health. Novel culture-independent techniques have facilitated the identification of new bacterial species at periodontal lesions and induced a reappraisal of the microbial etiology of periodontitis. In this chapter, we discuss how neutrophils interact with two emerging oral pathogens, Filifactor alocis and Peptoanaerobacter stomatis, and the different strategies deploy by these organisms to modulate neutrophil effector functions, with the goal to outline a new paradigm in our knowledge about neutrophil responses to putative periodontal pathogens and their contribution to disease progression.
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Affiliation(s)
- Irina Miralda
- Department of Medicine, School of Medicine, University of Louisville, Louisville, KY, USA.,Department of Microbiology and Immunology, School of Medicine, University of Louisville, Louisville, KY, USA
| | - Aruna Vashishta
- Department of Medicine, School of Medicine, University of Louisville, Louisville, KY, USA
| | - Silvia M Uriarte
- Department of Medicine, School of Medicine, University of Louisville, Louisville, KY, USA. .,Department of Microbiology and Immunology, School of Medicine, University of Louisville, Louisville, KY, USA.
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14
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Ley K, Hoffman HM, Kubes P, Cassatella MA, Zychlinsky A, Hedrick CC, Catz SD. Neutrophils: New insights and open questions. Sci Immunol 2018; 3:eaat4579. [PMID: 30530726 DOI: 10.1126/sciimmunol.aat4579] [Citation(s) in RCA: 325] [Impact Index Per Article: 54.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Accepted: 11/08/2018] [Indexed: 02/07/2024]
Abstract
Neutrophils are the first line of defense against bacteria and fungi and help combat parasites and viruses. They are necessary for mammalian life, and their failure to recover after myeloablation is fatal. Neutrophils are short-lived, effective killing machines. Their life span is significantly extended under infectious and inflammatory conditions. Neutrophils take their cues directly from the infectious organism, from tissue macrophages and other elements of the immune system. Here, we review how neutrophils traffic to sites of infection or tissue injury, how they trap and kill bacteria, how they shape innate and adaptive immune responses, and the pathophysiology of monogenic neutrophil disorders.
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Affiliation(s)
- Klaus Ley
- Division of Inflammation Biology, La Jolla Institute for Immunology, 9420 Athena Circle Drive, La Jolla, CA, USA.
- Department of Bioengineering, University of California, San Diego,9500 Gilman Drive, La Jolla, CA, USA
| | - Hal M Hoffman
- Division of Allergy, Immunology, and Rheumatology, Department of Pediatrics, University of California, San Diego and Rady Children's Hospital, San Diego, CA, USA
| | - Paul Kubes
- Immunology Research Group, Snyder Institute for Chronic Diseases, University of Calgary, Calgary, Alberta, Canada
| | - Marco A Cassatella
- Department of Medicine, Section of General Pathology, University of Verona, Strada Le Grazie 4, 37134 Verona, Italy
| | - Arturo Zychlinsky
- Max Planck Institute for Infection Biology, Charitéplatz 1, 10117 Berlin, Germany
| | - Catherine C Hedrick
- Division of Inflammation Biology, La Jolla Institute for Immunology, 9420 Athena Circle Drive, La Jolla, CA, USA
- Department of Bioengineering, University of California, San Diego,9500 Gilman Drive, La Jolla, CA, USA
| | - Sergio D Catz
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA, USA.
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15
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Bostanci N, Bao K, Li X, Maekawa T, Grossmann J, Panse C, Briones RA, Resuello RRG, Tuplano JV, Garcia CAG, Reis ES, Lambris JD, Hajishengallis G. Gingival Exudatome Dynamics Implicate Inhibition of the Alternative Complement Pathway in the Protective Action of the C3 Inhibitor Cp40 in Nonhuman Primate Periodontitis. J Proteome Res 2018; 17:3153-3175. [PMID: 30111112 DOI: 10.1021/acs.jproteome.8b00263] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Periodontitis is a prevalent chronic inflammatory disease associated with dysbiosis. Although complement inhibition has been successfully used to treat periodontitis in animal models, studies globally analyzing inflamed tissue proteins to glean insight into possible mechanisms of action are missing. Using quantitative shotgun proteomics, we aimed to investigate differences in composition of inflammatory gingival tissue exudate ("gingival crevicular fluid"; GCF), before and after local administration of an inhibitor of the central complement component, C3, in nonhuman primates. The C3 inhibitor, Cp40 (also known as AMY-101) was administered locally in the maxillary gingival tissue of cynomolgus monkeys with established periodontitis, either once a week (1×-treatment; n = 5 animals) or three times per week (3×-treatment; n = 10 animals), for 6 weeks followed by another 6 weeks of observation in the absence of treatment. 45 GCF samples were processed for FASP digestion and liquid chromatography-tandem mass spectrometry (LC-MS/MS) analysis. Data were processed using the ProgenesisQI software. The statistical significance of differences between the groups was determined by RM-ANOVA, and a protein expression change was considered as a true regulation at >2-fold and p < 0.05. The human orthologues were subjected to Gene Ontology analyses using PANTHER. Data are available via ProteomeXchange with identifier PXD009502. 573 proteins with >2 peptides were longitudinally quantified. Both 3× and 1× administration of Cp40 resulted in significant down-regulation of dozens of proteins during the 6-week course of treatment as compared to baseline. Following drug withdrawal at 6 weeks, more than 50% of the down-regulated proteins showed increased levels at week 12. The top scored pathway was "complement activation, alternative pathway", and several proteins involved in this pathway were down-regulated at 6 weeks. We mapped the proteomic fingerprint changes in local tissue exudate of cynomolgus monkey periodontitis in response to C3 inhibition and identified the alternative pathway of complement activation and leukocyte degranulation as main targets, which are thus likely to play significant roles in periodontal disease pathogenesis. Label-free quantitative proteomics strategies utilizing GCF are powerful tools for the identification of treatment targets and providing insights into disease mechanisms.
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Affiliation(s)
- Nagihan Bostanci
- Division of Oral Diseases, Department of Dental Medicine , Karolinska Institutet , SE-171 77 Stockholm , Sweden
| | - Kai Bao
- Division of Oral Diseases, Department of Dental Medicine , Karolinska Institutet , SE-171 77 Stockholm , Sweden
| | - Xiaofei Li
- Department of Microbiology, School of Dental Medicine , University of Pennsylvania , Philadelphia , Pennsylvania 19104 , United States
| | - Tomoki Maekawa
- Department of Microbiology, School of Dental Medicine , University of Pennsylvania , Philadelphia , Pennsylvania 19104 , United States
| | - Jonas Grossmann
- Functional Genomics Centre Zurich , University of Zurich/ETH Zurich , 8006 Zurich , Switzerland
| | - Christian Panse
- Functional Genomics Centre Zurich , University of Zurich/ETH Zurich , 8006 Zurich , Switzerland
| | - Ruel A Briones
- Manila Central University , College of Dentistry , Caloocan City , 1400 Metro Manila , Philippines
| | - Ranillo R G Resuello
- Simian Conservation Breeding and Research Center (SICONBREC) , Makati City , 1213 Metro Manila , Philippines
| | - Joel V Tuplano
- Simian Conservation Breeding and Research Center (SICONBREC) , Makati City , 1213 Metro Manila , Philippines
| | - Cristina A G Garcia
- Manila Central University , College of Dentistry , Caloocan City , 1400 Metro Manila , Philippines
| | - Edimara S Reis
- Department of Pathology and Laboratory Medicine , University of Pennsylvania School of Medicine , Philadelphia , Pennsylvania 19104 , United States
| | - John D Lambris
- Department of Pathology and Laboratory Medicine , University of Pennsylvania School of Medicine , Philadelphia , Pennsylvania 19104 , United States
| | - George Hajishengallis
- Department of Microbiology, School of Dental Medicine , University of Pennsylvania , Philadelphia , Pennsylvania 19104 , United States
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16
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Edmisson JS, Tian S, Armstrong CL, Vashishta A, Klaes CK, Miralda I, Jimenez-Flores E, Le J, Wang Q, Lamont RJ, Uriarte SM. Filifactor alocis modulates human neutrophil antimicrobial functional responses. Cell Microbiol 2018; 20:e12829. [PMID: 29377528 PMCID: PMC5980721 DOI: 10.1111/cmi.12829] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Revised: 01/19/2018] [Accepted: 01/22/2018] [Indexed: 12/24/2022]
Abstract
Filifactor alocis is a newly appreciated pathogen in periodontal diseases. Neutrophils are the predominant innate immune cell in the gingival crevice. In this study, we examined modulation of human neutrophil antimicrobial functions by F. alocis. Both non-opsonised and serum-opsonised F. alocis were engulfed by neutrophils but were not efficiently eliminated. Challenge of neutrophils with either non-opsonised or serum-opsonised F. alocis induced a minimal intracellular as well as extracellular respiratory burst response compared to opsonised Staphylococcus aureus and fMLF, respectively. However, pretreatment or simultaneous challenge of neutrophils with F. alocis did not affect the subsequent oxidative response to a particulate stimulus, suggesting that the inability to trigger the respiratory response was only localised to F. alocis phagosomes. In addition, although neutrophils engulfed live or heat-killed F. alocis with the same efficiency, heat-killed F. alocis elicited a higher intracellular respiratory burst response compared to viable organisms, along with decreased surface expression of CD35, a marker of secretory vesicles. F. alocis phagosomes remained immature by delayed and reduced recruitment of specific and azurophil granules, respectively. These results suggest that F. alocis withstands neutrophil antimicrobial responses by preventing intracellular ROS production, along with specific and azurophil granule recruitment to the bacterial phagosome.
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Affiliation(s)
- Jacob S. Edmisson
- Department of Medicine, School of Medicine, University of Louisville, Louisville, KY, USA
| | - Shifu Tian
- Department of Medicine, School of Medicine, University of Louisville, Louisville, KY, USA
| | - Cortney L. Armstrong
- Department of Microbiology & Immunology, School of Medicine, University of Louisville, Louisville, KY, USA
| | - Aruna Vashishta
- Department of Medicine, School of Medicine, University of Louisville, Louisville, KY, USA
| | - Christopher K. Klaes
- Department of Medicine, School of Medicine, University of Louisville, Louisville, KY, USA
| | - Irina Miralda
- Department of Microbiology & Immunology, School of Medicine, University of Louisville, Louisville, KY, USA
| | - Emeri Jimenez-Flores
- Department of Medicine, School of Medicine, University of Louisville, Louisville, KY, USA
- Department of Oral Immunology and Infectious Diseases, School of Dentistry, University of Louisville, Louisville, KY, USA
| | - Junyi Le
- Department of Medicine, School of Medicine, University of Louisville, Louisville, KY, USA
| | - Qian Wang
- Department of Oral Immunology and Infectious Diseases, School of Dentistry, University of Louisville, Louisville, KY, USA
| | - Richard J. Lamont
- Department of Oral Immunology and Infectious Diseases, School of Dentistry, University of Louisville, Louisville, KY, USA
| | - Silvia M. Uriarte
- Department of Medicine, School of Medicine, University of Louisville, Louisville, KY, USA
- Department of Microbiology & Immunology, School of Medicine, University of Louisville, Louisville, KY, USA
- Department of Oral Immunology and Infectious Diseases, School of Dentistry, University of Louisville, Louisville, KY, USA
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17
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Armstrong CL, Klaes CK, Vashishta A, Lamont RJ, Uriarte SM. Filifactor alocis manipulates human neutrophils affecting their ability to release neutrophil extracellular traps induced by PMA. Innate Immun 2018; 24:210-220. [PMID: 29649915 PMCID: PMC6410572 DOI: 10.1177/1753425918767507] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Neutrophils operate at the site of injury or inflammation in the periodontal
pocket to ensure periodontal health and clearance of bacterial pathogens.
Filifactor alocis is recently identified as a potential
periodontal pathogen, and in this study, we assessed the formation of neutrophil
extracellular traps (NETs), in response to the presence of the
organism. NET formation by human neutrophils was not
induced when challenged with F. alocis, independent of
opsonization, viability, time, or bacterial dose. F. alocis
also failed to induce NETs from TNF-α-primed neutrophils and did not induce the
release of extracellular neutrophil elastase. However, significant NET induction
was observed when neutrophils were challenged with Streptococcus
gordonii or Peptoanaerobacter stomatis, In
addition, co-infection studies revealed that the presence of F.
alocis with S. gordonii or P.
stomatis does not enhance or reduce NETs. Additionally, F.
alocis failed to impact pre-formed NETs induced by either
S. gordonii or P. stomatis. Pretreatment
with F. alocis prior to stimulation with phorbol 12-myristate
13-acetate (PMA), S. gordonii, or P. stomatis
revealed that the bacterium is capable of reducing only PMA but not S.
gordonii or P. stomatis NET formation. These
results indicate that F. alocis manipulates neutrophils,
inhibiting the triggering of NET induction.
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Affiliation(s)
| | | | | | - Richard J Lamont
- 3 Department of Oral Immunology and Infectious Diseases, University of Louisville, USA
| | - Silvia M Uriarte
- 1 Department of Microbiology and Immunology, University of Louisville, USA.,2 Department of Medicine, University of Louisville, USA.,3 Department of Oral Immunology and Infectious Diseases, University of Louisville, USA
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