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Fernandes Forte CP, Oliveira FAF, Lopes CDB, Alves APNN, Mota MRL, de Barros Silva PG, Montenegro RC, Campos Ribeiro Dos Santos ÂK, Lobo Filho JG, Sousa FB. Streptococcus mutans in atherosclerotic plaque: Molecular and immunohistochemical evaluations. Oral Dis 2021; 28:1705-1714. [PMID: 33825326 DOI: 10.1111/odi.13869] [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: 10/15/2020] [Revised: 03/10/2021] [Accepted: 03/30/2021] [Indexed: 11/28/2022]
Abstract
OBJECTIVES To verify the presence of Streptococcus mutans (S. mutans) in atherosclerotic plaque (AP) using techniques with different sensitivities, correlating with histological changes in plaque and immunoexpression of inflammatory markers. MATERIALS AND METHODS Thirteen AP samples were subjected to real-time polymerase chain reaction (qRT-PCR), histopathological analyses, histochemical analysis by Giemsa staining (GS), and immunohistochemical analysis for S. mutans, IL-1β, and TNF-α (streptavidin-biotin-peroxidase method). Ten necropsy samples of healthy vessels were used as controls. RESULTS All AP samples showed histopathological characteristics of severe atherosclerosis and were positive for S. mutans (100.0%) in qRT-PCR and immunohistochemical analyses. GS showed that Streptococcus sp. colonized the lipid-rich core regions and fibrous tissue, while the control group was negative for Streptococcus sp. IL-1β and TNF-α were expressed in 100% and 92.3% of the AP tested, respectively. The control samples were positive for S. mutans in qRT-PCR analysis, but negative for S. mutans, IL-1β, and TNF-α in immunohistochemical analyses. CONCLUSION The detection of S. mutans in AP and the visualization of Streptococcus sp. suggested a possible association between S. mutans and atherosclerosis. The results obtained from the control samples suggested the presence of DNA fragments or innocuous bacteria that were not associated with tissue alteration. However, future studies are necessary to provide more information.
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Affiliation(s)
| | | | - Camile de Barros Lopes
- Department of Human and Medical Genetics, School of Biological Sciences, Federal University of Para, Belém, Brazil
| | | | - Mário Rogério Lima Mota
- Department of Stomatology and Oral Pathology, School of Dentistry, Federal University of Ceará, Fortaleza, Brazil
| | | | - Raquel Carvalho Montenegro
- Department of Human Cytogenetics, School of Biological Sciences, Federal University of Para, Belém, Brazil
| | | | | | - Fabrício Bitu Sousa
- Department of Stomatology and Oral Pathology, School of Dentistry, Federal University of Ceará, Fortaleza, Brazil
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Vajpeyee A, Chauhan PS, Pandey S, Tiwari S, Yadav LB, Shroti AK, Vajpeyee M. Metagenomics Analysis of Thrombus Samples Retrieved from Mechanical Thrombectomy. Neurointervention 2021; 16:39-45. [PMID: 33530675 PMCID: PMC7946554 DOI: 10.5469/neuroint.2020.00353] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Accepted: 01/04/2021] [Indexed: 01/08/2023] Open
Abstract
Purpose The purpose of this study was to assess the microbiota in middle cerebral artery thrombi retrieved in mechanical thrombectomy arising out of symptomatic carotid plaque within 6 hours of acute ischemic stroke. Thrombi were subjected to next-generation sequencing for a bacterial signature to determine their role in atherosclerosis. Materials and Methods We included 4 human middle cerebral artery thrombus samples (all patients were male). The median age for the patients was 51±13.6 years. Patients enrolled in the study from Pacific Medical University and Hospital underwent mechanical thrombectomy in the stroke window period. All patients underwent brain magnetic resonance angiography (MRA) and circle of Willis and neck vessel MRA along with the standard stroke workup to establish stroke etiology. Only patients with symptomatic carotid stenosis and tandem lesions with ipsilateral middle cerebral artery occlusion were included in the study. Thrombus samples were collected, stored at –80 degrees, and subjected to metagenomics analysis. Results Of the 4 patients undergoing thrombectomy for diagnosis with ischemic stroke, all thrombi recovered for bacterial DNA in qPCR were positive. More than 27 bacteria were present in the 4 thrombus samples. The majority of bacteria were Lactobacillus, Stenotrophomonas, Pseudomonas, Staphylococcus, and Finegoldia. Conclusion Genesis of symptomatic atherosclerotic carotid plaque leading to thromboembolism could be either due to direct mechanisms like acidification and local inflammation of plaque milieu with lactobacillus, biofilm dispersion leading to inflammation like with pseudomonas fluorescence, or enterococci or indirect mechanisms like Toll 2 like signaling by gut microbiota.
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Affiliation(s)
- Atulabh Vajpeyee
- Department of Neurology, Pacific Medical College & Hospital, Pacific Medical University, Udaipur, India
| | | | - Swapnil Pandey
- CSIR National Botanical Research Institute, Lucknow, India
| | - Shivam Tiwari
- Department of Neurology, Pacific Medical College & Hospital, Pacific Medical University, Udaipur, India
| | - Lokendra Bahadur Yadav
- Department of Neurology, Pacific Medical College & Hospital, Pacific Medical University, Udaipur, India
| | - Akhilesh Kumar Shroti
- Department of Neurology, Pacific Medical College & Hospital, Pacific Medical University, Udaipur, India
| | - Manisha Vajpeyee
- Department of Neurology, Pacific Medical College & Hospital, Pacific Medical University, Udaipur, India
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Brun A, Nuzzo A, Prouvost B, Diallo D, Hamdan S, Meseguer E, Guidoux C, Lavallée P, Amarenco P, Lesèche G, Bouchard P, Michel JB, Rangé H. Oral microbiota and atherothrombotic carotid plaque vulnerability in periodontitis patients. A cross-sectional study. J Periodontal Res 2020; 56:339-350. [PMID: 33368263 DOI: 10.1111/jre.12826] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 09/13/2020] [Accepted: 11/23/2020] [Indexed: 12/21/2022]
Abstract
BACKGROUND An increased risk of atherothrombotic vascular events has been reported in periodontitis patients. Periodontitis is associated with dysbiotic subgingival biofilms and bacteremia. OBJECTIVE We hypothesized (a) that the oral microbiome is associated with the carotid microbiome and (b) that periodontitis could contribute to plaque vulnerability. The aim of this study was to determine the associations between periodontitis, the carotid microbiome, and the local innate immune response in carotid atherothrombotic plaques vulnerable to rupture. METHODS In this cross-sectional study, 45 patients admitted for carotid endarterectomy underwent a preoperative periodontal examination. The volume of intraplaque hemorrhage reflected by the hemoglobin level released in carotid-conditioned media was considered as a criterion of carotid plaque vulnerability. Levels of antibodies against periodontal bacteria were determined in sera. The signature of the oral microbiota was assessed by microbial whole-genome sequencing, nested PCR, and immunostaining in carotid plaque samples. Markers of neutrophil recruitment (leukotriene B4), neutrophil activation (myeloperoxidase, defensins), and cytokines were measured in carotid-conditioned media and/or plasma. RESULTS All patients exhibited periodontitis. One hundred and forty-four bacterial genera were detected in the carotid microbiome. While Streptococcus was found in 84% of the carotid samples, periodontitis-associated genera were detected in 21%. P. gingivalis DNA and gingipains were also identified in carotid samples. There were significant inverse correlations between periodontal attachment loss/serum anti-P. gingivalis Immunoglobulin A and cytokine inhibiting neutrophils (all P < .01). There were also significant positive correlations between lipopolysaccharides, myeloperoxidase/human neutrophil peptides1-3, and hemoglobin levels (all P < .01). CONCLUSIONS In patients at risk of stroke, the carotid plaque microbiome was highly diverse and compatible with an oral origin. Periodontitis was significantly associated with neutrophil activation markers and plaque vulnerability to rupture.
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Affiliation(s)
- Adrian Brun
- Department of Periodontology, Faculty of Dental Surgery Montrouge, Université de Paris, Montrouge, France.,Division of Periodontology, Department of Oral Medicine, AP-HP, Henri Mondor Hospital, Créteil, France.,Laboratory for Vascular Translational Science, Inserm UMRS 1148, Paris, France
| | - Alexandre Nuzzo
- Laboratory for Vascular Translational Science, Inserm UMRS 1148, Paris, France.,Department of Gastroenterology, Faculty of Medicine Xavier Bichat-Beaujon, Université de Paris, Clichy, France.,IBD and Intestinal Failure Unit, Department of Gastroenterology, APHP, Beaujon Hospital, Paris, France
| | - Bastien Prouvost
- Department of Periodontology, Faculty of Odontology Garancière, Université de Paris, Paris, France
| | - Devy Diallo
- Laboratory for Vascular Translational Science, Inserm UMRS 1148, Paris, France
| | - Sandrella Hamdan
- Laboratory for Vascular Translational Science, Inserm UMRS 1148, Paris, France
| | - Elena Meseguer
- Laboratory for Vascular Translational Science, Inserm UMRS 1148, Paris, France.,Department of Neurology, Faculty of Medicine Xavier Bichat, Université de Paris, Paris, France.,Department of Neurology and Stroke Centre, APHP, Bichat Hospital, Paris, France
| | - Céline Guidoux
- Laboratory for Vascular Translational Science, Inserm UMRS 1148, Paris, France.,Department of Neurology, Faculty of Medicine Xavier Bichat, Université de Paris, Paris, France.,Department of Neurology and Stroke Centre, APHP, Bichat Hospital, Paris, France
| | - Philippa Lavallée
- Laboratory for Vascular Translational Science, Inserm UMRS 1148, Paris, France.,Department of Neurology, Faculty of Medicine Xavier Bichat, Université de Paris, Paris, France.,Department of Neurology and Stroke Centre, APHP, Bichat Hospital, Paris, France
| | - Pierre Amarenco
- Laboratory for Vascular Translational Science, Inserm UMRS 1148, Paris, France.,Department of Neurology, Faculty of Medicine Xavier Bichat, Université de Paris, Paris, France.,Department of Neurology and Stroke Centre, APHP, Bichat Hospital, Paris, France
| | - Guy Lesèche
- Laboratory for Vascular Translational Science, Inserm UMRS 1148, Paris, France.,Department of Vascular Surgery, Faculty of Medicine Xavier Bichat, Université de Paris, Paris, France.,Department of Vascular Surgery, APHP, Bichat Hospital, Paris, France
| | - Philippe Bouchard
- Department of Periodontology, Faculty of Odontology Garancière, Université de Paris, Paris, France.,Division of Periodontology, Department of Odontology, APHP, Rothschild Hospital, Paris, France.,Orofacial Pathologies, Imaging and Biotherapies laboratory, UR2496, Université de Paris, Montrouge, France
| | | | - Hélène Rangé
- Department of Periodontology, Faculty of Odontology Garancière, Université de Paris, Paris, France.,Division of Periodontology, Department of Odontology, APHP, Rothschild Hospital, Paris, France.,Orofacial Pathologies, Imaging and Biotherapies laboratory, UR2496, Université de Paris, Montrouge, France
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Bacterial signatures in thrombus aspirates of patients with lower limb arterial and venous thrombosis. J Vasc Surg 2017; 67:1902-1907. [PMID: 28847664 DOI: 10.1016/j.jvs.2017.05.090] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Accepted: 05/01/2017] [Indexed: 11/22/2022]
Abstract
OBJECTIVE Increasing data supports the role of bacterial inflammation in adverse events of cardiovascular and cerebrovascular diseases. In our previous research, DNA of bacterial species found in coronary artery thrombus aspirates and ruptured cerebral aneurysms were mostly of endodontic and periodontal origin, where Streptococcus mitis group DNA was the most common. We hypothesized that the genomes of S mitis group could be identified in thrombus aspirates of patients with lower limb arterial and deep venous thrombosis. METHODS Thrombus aspirates and control blood samples taken from 42 patients with acute or acute-on-chronic lower limb ischemia (Rutherford I-IIb) owing to arterial or graft thrombosis (n = 31) or lower limb deep venous thrombosis (n = 11) were examined using a quantitative real-time polymerase chain reaction to detect all possible bacterial DNA and DNA of S mitis group in particular. The samples were considered positive, if the amount of bacterial DNA in the thrombus aspirates was 2-fold or greater in comparison with control blood samples. RESULTS In the positive samples the mean difference for the total bacterial DNA was 12.1-fold (median, 7.1), whereas the differences for S mitis group DNA were a mean of 29.1 and a median of 5.2-fold. Of the arterial thrombus aspirates, 57.9% were positive for bacterial DNA, whereas bacterial genomes were found in 75% of bypass graft thrombosis with 77.8% of the prosthetic grafts being positive. Of the deep vein thrombus aspirates, 45.5% contained bacterial genomes. Most (80%) of bacterial DNA-positive cases contained DNA from the S mitis group. Previous arterial interventions were significantly associated with the occurrence of S mitis group DNA (P = .049, Fisher's exact test). CONCLUSIONS This is the first study to report the presence of bacterial DNA, predominantly of S mitis group origin, in the thrombus aspirates of surgical patients with lower limb arterial and deep venous thrombosis, suggesting their possible role in the pathogenesis of thrombotic events. Additional studies will, however, be needed to reach a final conclusion.
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Calandrini CA, Ribeiro AC, Gonnelli AC, Ota-Tsuzuki C, Rangel LP, Saba-Chujfi E, Mayer MPA. Microbial composition of atherosclerotic plaques. Oral Dis 2015; 20:e128-34. [PMID: 24188425 DOI: 10.1111/odi.12205] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2012] [Revised: 10/08/2013] [Accepted: 10/14/2013] [Indexed: 12/20/2022]
Abstract
OBJECTIVE The association of infections such as periodontitis with atherosclerotic diseases is well documented. In spite of the high diversity of the human oral microbiota, and its close contact with the circulatory system, few oral species were detected in atherosclerotic plaques. Thus, we attempted to evaluate the microbial diversity of atherosclerotic plaques from patients with different periodontal conditions, submitted to endarterectomy by a broad-range microbial method. MATERIALS AND METHODS Patients indicated for aorta endarterectomy due to myocardial infarction were recruited for periodontal clinical examination. The microbial diversity of atherosclerotic plaques (n = 35) was evaluated by sequence analysis of bacterial 16S rRNA libraries. RESULTS Bacterial DNA was detected in 12 endarterectomy specimens (34.3%). Twenty-three bacterial species/phylotypes were identified. Proteobacteria and Firmicutes comprised 78.3% and 21.7% of the identified taxa, respectively. Fifteen (60.9%) phylotypes were reported as yet uncultivable or as yet uncharacterized species. Two uncultured phylotypes were previously detected in the human mouth. The periodontopathogen Aggregatibacter actinomycetemcomitans was detected in seven samples (20%), followed by Pseudomonas species. There was no association between periodontal parameters and detection of A. actinomycetemcomitans or other phylotypes in atherosclerotic plaques. CONCLUSION Our results suggest a role of the oral microbiota in the development of inflammation in atherogenesis, particularly of A. actinomycetemcomitans.
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Affiliation(s)
- C A Calandrini
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil; Department of Periodontology, São Leopoldo Mandic University, Campinas, SP, Brazil
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Potgieter M, Bester J, Kell DB, Pretorius E. The dormant blood microbiome in chronic, inflammatory diseases. FEMS Microbiol Rev 2015; 39:567-91. [PMID: 25940667 PMCID: PMC4487407 DOI: 10.1093/femsre/fuv013] [Citation(s) in RCA: 269] [Impact Index Per Article: 29.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/02/2015] [Indexed: 02/07/2023] Open
Abstract
Blood in healthy organisms is seen as a ‘sterile’ environment: it lacks proliferating microbes. Dormant or not-immediately-culturable forms are not absent, however, as intracellular dormancy is well established. We highlight here that a great many pathogens can survive in blood and inside erythrocytes. ‘Non-culturability’, reflected by discrepancies between plate counts and total counts, is commonplace in environmental microbiology. It is overcome by improved culturing methods, and we asked how common this would be in blood. A number of recent, sequence-based and ultramicroscopic studies have uncovered an authentic blood microbiome in a number of non-communicable diseases. The chief origin of these microbes is the gut microbiome (especially when it shifts composition to a pathogenic state, known as ‘dysbiosis’). Another source is microbes translocated from the oral cavity. ‘Dysbiosis’ is also used to describe translocation of cells into blood or other tissues. To avoid ambiguity, we here use the term ‘atopobiosis’ for microbes that appear in places other than their normal location. Atopobiosis may contribute to the dynamics of a variety of inflammatory diseases. Overall, it seems that many more chronic, non-communicable, inflammatory diseases may have a microbial component than are presently considered, and may be treatable using bactericidal antibiotics or vaccines. Atopobiosis of microbes (the term describing microbes that appear in places other than where they should be), as well as the products of their metabolism, seems to correlate with, and may contribute to, the dynamics of a variety of inflammatory diseases.
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Affiliation(s)
- Marnie Potgieter
- Department of Physiology, Faculty of Health Sciences, University of Pretoria, Arcadia 0007, South Africa
| | - Janette Bester
- Department of Physiology, Faculty of Health Sciences, University of Pretoria, Arcadia 0007, South Africa
| | - Douglas B Kell
- School of Chemistry and The Manchester Institute of Biotechnology, The University of Manchester, 131, Princess St, Manchester M1 7DN, Lancs, UK
| | - Etheresia Pretorius
- Department of Physiology, Faculty of Health Sciences, University of Pretoria, Arcadia 0007, South Africa
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Effect of toll-like receptor agonists on the formation of macrophage/foam cells upon acute peritonitis in mice. Bull Exp Biol Med 2014; 156:49-52. [PMID: 24319727 DOI: 10.1007/s10517-013-2275-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
We studied effects of zymosan, double-stranded RNA, LPS of E. coli and bacterial CpG DNA, agonists of toll-like receptor TLR2, TLR3, TLR4 and TLR9, respectively, on the formation of macrophage/foam cells 24 h after induction of acute peritonitis. Administration of agonists led to transformation of peritoneal macrophages into foam cells and significant activation of cell biosynthesis and increased the content of triglycerides and cholesterol esters in the absence of LDL and irrespective of the capacity of TLR agonists to stimulate neutrophil infiltration and TNF-α production in the peritoneal cavity.
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Armingohar Z, Jørgensen JJ, Kristoffersen AK, Abesha-Belay E, Olsen I. Bacteria and bacterial DNA in atherosclerotic plaque and aneurysmal wall biopsies from patients with and without periodontitis. J Oral Microbiol 2014; 6:23408. [PMID: 25006361 PMCID: PMC4024159 DOI: 10.3402/jom.v6.23408] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2014] [Revised: 04/23/2014] [Accepted: 04/23/2014] [Indexed: 01/12/2023] Open
Abstract
Background Several studies have reported an association between chronic periodontitis (CP) and cardiovascular diseases. Detection of periodontopathogens, including red complex bacteria (RCB), in vascular lesions has suggested these bacteria to be involved in the pathogenesis of atherosclerosis and abdominal aortic aneurysms. Objective In this study, we investigate bacteria and their DNA in vascular biopsies from patients with vascular diseases (VD; i.e. abdominal aortic aneurysms, atherosclerotic carotid, and common femoral arteries), with and without CP. Methods DNA was extracted from vascular biopsies selected from 40 VD patients: 30 with CP and 10 without CP. The V3-V5 region of the 16S rDNA (V3-V5) was polymerase chain reaction (PCR)-amplified, and the amplicons were cloned into Escherichia coli, sequenced, and classified (GenBank and the Human Oral Microbiome database). Species-specific primers were used for the detection of Porphyromonas gingivalis. In addition, 10 randomly selected vascular biopsies from the CP group were subjected to scanning electron microscopy (SEM) for visualization of bacteria. Checkerboard DNA–DNA hybridization was performed to assess the presence of RCB in 10 randomly selected subgingival plaque samples from CP patients. Results A higher load and mean diversity of bacteria were detected in vascular biopsies from VD patients with CP compared to those without CP. Enterobacteriaceae were frequently detected in vascular biopsies together with cultivable, commensal oral, and not-yet-cultured bacterial species. While 70% of the subgingival plaque samples from CP patients showed presence of RCB, only P. gingivalis was detected in one vascular biopsy. Bacterial cells were seen in all 10 vascular biopsies examined by SEM. Conclusions A higher bacterial load and more diverse colonization were detected in VD lesions of CP patients as compared to patients without CP. This indicated that a multitude of bacterial species both from the gut and the oral cavity, rather than exclusively periodontopathogens, may be involved as additional risk factors in the pathogenesis of VD.
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Affiliation(s)
- Zahra Armingohar
- Department of Oral Biology, Faculty of Dentistry, University of Oslo, Oslo, Norway
| | - Jørgen J Jørgensen
- Department of Vascular Surgery, Oslo University Hospital, Aker and University of Oslo, Oslo, Norway
| | | | - Emnet Abesha-Belay
- Department of Oral Biology, Faculty of Dentistry, University of Oslo, Oslo, Norway
| | - Ingar Olsen
- Department of Oral Biology, Faculty of Dentistry, University of Oslo, Oslo, Norway
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Peräneva L, Fogarty CL, Pussinen PJ, Forsblom C, Groop PH, Lehto M. Systemic exposure to Pseudomonal bacteria: a potential link between type 1 diabetes and chronic inflammation. Acta Diabetol 2013; 50:351-61. [PMID: 22864910 DOI: 10.1007/s00592-012-0421-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2012] [Accepted: 07/22/2012] [Indexed: 12/13/2022]
Abstract
Bacterial endotoxins have been associated with chronic inflammation and the development and progression of diabetic nephropathy. We hypothesized that subjects with high serum lipopolysaccharide activity also carry remains of bacterial DNA in their system. Serum-derived bacterial DNA clones were isolated and identified from 10 healthy controls and 14 patients with type 1 diabetes (T1D) using universal primers targeted to bacterial 16S rDNA. A total of 240 clones representing 35 unique bacterial species were isolated and identified. A significant proportion of the isolated bacteria could be assigned to our living environment. Proteobacteria was by far the most prevalent phylum among the samples. Notably, the patients had significantly higher frequencies of Stenotrophomonas maltophilia clones in their sera compared to the healthy controls. Real-time PCR analysis of S. maltophilia and Pseudomonas aeruginosa flagellin gene copy number in the human leukocyte DNA fraction revealed that the overall Pseudomonal bacterial load was higher in older patients with T1D. Serum IgA- and IgG-antibody levels against Pseudomonal bacteria Delftia acidovorans, P. aeruginosa, and S. maltophilia were also determined in 200 healthy controls and 200 patients with T1D. The patients had significantly higher serum levels of IgA antibodies against all three Pseudomonal bacteria. Additionally, the IgA antibodies against Pseudomonal bacteria correlated significantly with serum C-reactive protein. These findings indicate that recurrent or chronic Pseudomonal exposure may increase susceptibility to chronic inflammation in patients with T1D.
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Affiliation(s)
- Lina Peräneva
- Biomedicum Helsinki, Folkhälsan Institute of Genetics, Folkhälsan Research Center/FinnDiane, Haartmaninkatu 8, 00290, Helsinki, Finland
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Lu M, Varley AW, Munford RS. Persistently active microbial molecules prolong innate immune tolerance in vivo. PLoS Pathog 2013; 9:e1003339. [PMID: 23675296 PMCID: PMC3649966 DOI: 10.1371/journal.ppat.1003339] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2012] [Accepted: 03/18/2013] [Indexed: 01/01/2023] Open
Abstract
Measures that bolster the resolution phase of infectious diseases may offer new opportunities for improving outcome. Here we show that inactivation of microbial lipopolysaccharides (LPS) can be required for animals to recover from the innate immune tolerance that follows exposure to Gram-negative bacteria. When wildtype mice are exposed to small parenteral doses of LPS or Gram-negative bacteria, their macrophages become reprogrammed (tolerant) for a few days before they resume normal function. Mice that are unable to inactivate LPS, in contrast, remain tolerant for several months; during this time they respond sluggishly to Gram-negative bacterial challenge, with high mortality. We show here that prolonged macrophage reprogramming is maintained in vivo by the persistence of stimulatory LPS molecules within the cells' in vivo environment, where naïve cells can acquire LPS via cell-cell contact or from the extracellular fluid. The findings provide strong evidence that inactivation of a stimulatory microbial molecule can be required for animals to regain immune homeostasis following parenteral exposure to bacteria. Measures that disable microbial molecules might enhance resolution of tissue inflammation and help restore innate defenses in individuals recovering from many different infectious diseases. We showed previously that mice lacking acyloxyacyl hydrolase (AOAH), the host enzyme that inactivates Gram-negative bacterial lipopolysaccharides (LPS), are unable to regain normal immune responsiveness for many weeks/months after they are exposed in vivo to a small amount of LPS or Gram-negative bacteria. The many possible explanations for slow recovery included long-lasting epigenetic changes in macrophages or other host cells, chronically stimulated cells that produce certain mediators, and persistent signaling by internalized LPS within macrophages. Using several in vivo techniques to study peritoneal macrophages, we found that none of these mechanisms was correct. Rather, prolonged recovery is caused by intact LPS that remains in the environment where macrophages live and can pass from one cell to another in vivo. This is the first evidence that the persistence of a bioactive microbial agonist, per se, can prevent resolution of inflammation in vivo. It also identifies the stimulatory microbial molecule as a realistic target for intervention – in further support, we found that providing recombinant AOAH can be partially preventive. In a larger sense, showing that chemical inactivation of one important microbial signaling molecule is required for full recovery should encourage efforts to find out whether disabling other microbial agonists (chitin, lipopeptides, flagella, others) also benefits infected animals.
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Affiliation(s)
- Mingfang Lu
- Laboratory of Clinical Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, United States of America.
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Bazaz R, Marriott HM, Francis SE, Dockrell DH. Mechanistic links between acute respiratory tract infections and acute coronary syndromes. J Infect 2013; 66:1-17. [DOI: 10.1016/j.jinf.2012.09.009] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2012] [Revised: 09/22/2012] [Accepted: 09/26/2012] [Indexed: 12/27/2022]
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Sonnenberg GF, Artis D. Innate lymphoid cell interactions with microbiota: implications for intestinal health and disease. Immunity 2012. [PMID: 23084357 DOI: 10.1016/j.immuni.2012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The mammalian intestine harbors trillions of beneficial commensal bacteria that are essential for the development of the immune system and for maintenance of physiologic processes in multiple organs. However, numerous chronic infectious, inflammatory, and metabolic diseases in humans have been associated with alterations in the composition or localization of commensal bacteria that result in dysregulated host-commensal bacteria relationships. The mammalian immune system plays an essential role in regulating the acquisition, composition, and localization of commensal bacteria in the intestine. Emerging research has implicated innate lymphoid cells (ILCs) as a critical immune cell population that orchestrates some of these host-commensal bacteria relationships that can impact immunity, inflammation, and tissue homeostasis in the intestine. This review will discuss reciprocal interactions between intestinal commensal bacteria and ILCs in the context of health and disease.
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Affiliation(s)
- Gregory F Sonnenberg
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, 19104, USA.
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Sonnenberg GF, Artis D. Innate lymphoid cell interactions with microbiota: implications for intestinal health and disease. Immunity 2012; 37:601-10. [PMID: 23084357 DOI: 10.1016/j.immuni.2012.10.003] [Citation(s) in RCA: 201] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2012] [Indexed: 02/08/2023]
Abstract
The mammalian intestine harbors trillions of beneficial commensal bacteria that are essential for the development of the immune system and for maintenance of physiologic processes in multiple organs. However, numerous chronic infectious, inflammatory, and metabolic diseases in humans have been associated with alterations in the composition or localization of commensal bacteria that result in dysregulated host-commensal bacteria relationships. The mammalian immune system plays an essential role in regulating the acquisition, composition, and localization of commensal bacteria in the intestine. Emerging research has implicated innate lymphoid cells (ILCs) as a critical immune cell population that orchestrates some of these host-commensal bacteria relationships that can impact immunity, inflammation, and tissue homeostasis in the intestine. This review will discuss reciprocal interactions between intestinal commensal bacteria and ILCs in the context of health and disease.
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Affiliation(s)
- Gregory F Sonnenberg
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, 19104, USA.
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Cysteine proteases from Porphyromonas gingivalis and TLR ligands synergistically induce the synthesis of the cytokine IL-8 in human artery endothelial cells. Arch Oral Biol 2011; 56:1583-91. [DOI: 10.1016/j.archoralbio.2011.06.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2010] [Revised: 06/08/2011] [Accepted: 06/29/2011] [Indexed: 11/21/2022]
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Nicolaou G, Goodall AH, Erridge C. Diverse bacteria promote macrophage foam cell formation via Toll-like receptor-dependent lipid body biosynthesis. J Atheroscler Thromb 2011; 19:137-48. [PMID: 22123216 DOI: 10.5551/jat.10249] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
AIM Atherosclerotic lesions contain DNA signatures from a wide variety of bacteria, although little is known of how exposure to these organisms may modulate the accumulation of lipids in macrophages. METHODS To address this, a panel of nine bacteria representing those most frequently reported to be present in human atheroma were examined for their potential to promote lipid accumulation in human primary monocytes and murine J774 macrophages. RESULTS All bacteria examined, and defined stimulants of Toll-like receptors (TLRs) 2, 3, 4, 5 and 9, induced lipid body formation and cholesterol ester accumulation in a dose-dependent manner. The mechanisms of bacteria-mediated foam cell formation were found to be dependent on TLR2 and/or TLR4 signalling, but independent of lipoprotein oxidation pathways, since lipid accumulation was significantly inhibited by the TLR4 inhibitors polymyxin-B and TAK-242, or the TLR2 and TLR4 inhibitor oxidised palmitoyl-arachidonyl-phosphatidyl-choline, but not by the scavenger receptor blocker polyinosinic acid or the antioxidant butylated hydroxytoluene. A number of genes involved in lipid body biosynthesis, including perilipin-A, stearoyl-coenzyme-A desaturase 1, fatty acid synthase and HMG-CoA reductase were upregulated in response to TLR4 stimulation. CONCLUSIONS The bacterial debris observed in human atheroma, which is currently considered to be harmless, may have potential to contribute to disease progression via TLR-dependent lipid body formation in macrophages.
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Affiliation(s)
- Giovanna Nicolaou
- Department of Cardiovascular Sciences, Glenfield Hospital, Leicester, UK
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Galluzzo S, Patti G, Dicuonzo G, Di Sciascio G, Tonini G, Ferraro E, Spoto C, Campanale R, Zoccoli A, Angeletti S. Association between NOD2/CARD15 polymorphisms and coronary artery disease: a case–control study. Hum Immunol 2011; 72:636-40. [DOI: 10.1016/j.humimm.2011.04.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2010] [Revised: 04/05/2011] [Accepted: 04/18/2011] [Indexed: 10/18/2022]
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Abstract
OBJECTIVE The purpose of this review article is to summarize what is currently known about microbes associated with the human body and to provide examples of how this knowledge impacts the care of surgical patients. BACKGROUND Pioneering research over the past decade has demonstrated that human beings live in close, constant contact with dynamic communities of microbial organisms. This new reality has wide-ranging implications for the care of surgical patients. METHODS AND RESULTS Recent advances in the culture-independent study of the human microbiome are reviewed. To illustrate the translational relevance of these studies to surgical disease, we discuss in detail what is known about the role of microbes in the pathogenesis of obesity, gastrointestinal malignancies, Crohn disease, and perioperative complications including surgical site infections and sepsis. The topics of mechanical bowel preparation and perioperative antibiotics are also discussed. CONCLUSIONS Heightened understanding of the microbiome in coming years will likely offer opportunities to refine the prevention and treatment of a wide variety of surgical conditions.
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Michel JB, Martin-Ventura JL, Egido J, Sakalihasan N, Treska V, Lindholt J, Allaire E, Thorsteinsdottir U, Cockerill G, Swedenborg J. Novel aspects of the pathogenesis of aneurysms of the abdominal aorta in humans. Cardiovasc Res 2011; 90:18-27. [PMID: 21037321 PMCID: PMC3058728 DOI: 10.1093/cvr/cvq337] [Citation(s) in RCA: 239] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2010] [Revised: 10/04/2010] [Accepted: 10/20/2010] [Indexed: 01/22/2023] Open
Abstract
Aneurysm of the abdominal aorta (AAA) is a particular, specifically localized form of atherothrombosis, providing a unique human model of this disease. The pathogenesis of AAA is characterized by a breakdown of the extracellular matrix due to an excessive proteolytic activity, leading to potential arterial wall rupture. The roles of matrix metalloproteinases and plasmin generation in progression of AAA have been demonstrated both in animal models and in clinical studies. In the present review, we highlight recent studies addressing the role of the haemoglobin-rich, intraluminal thrombus and the adventitial response in the development of human AAA. The intraluminal thrombus exerts its pathogenic effect through platelet activation, fibrin formation, binding of plasminogen and its activators, and trapping of erythrocytes and neutrophils, leading to oxidative and proteolytic injury of the arterial wall. These events occur mainly at the intraluminal thrombus-circulating blood interface, and pathological mediators are conveyed outwards, where they promote matrix degradation of the arterial wall. In response, neo-angiogenesis, phagocytosis by mononuclear cells, and a shift from innate to adaptive immunity in the adventitia are observed. Abdominal aortic aneurysm thus represents an accessible spatiotemporal model of human atherothrombotic progression towards clinical events, the study of which should allow further understanding of its pathogenesis and the translation of pathogenic biological activities into diagnostic and therapeutic applications.
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Affiliation(s)
- Jean-Baptiste Michel
- Inserm Unit 698, Cardiovascular Remodelling, Denis Diderot University, Hôpital X. Bichat, Paris, France.
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Vasa vasorum hypoxia: Initiation of atherosclerosis. Med Hypotheses 2009; 73:40-1. [DOI: 10.1016/j.mehy.2008.11.046] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2008] [Revised: 11/19/2008] [Accepted: 11/21/2008] [Indexed: 11/20/2022]
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Erridge C, Burdess A, Jackson AJ, Murray C, Riggio M, Lappin D, Milligan S, Spickett CM, Webb DJ. Vascular cell responsiveness to Toll-like receptor ligands in carotid atheroma. Eur J Clin Invest 2008; 38:713-20. [PMID: 18837796 DOI: 10.1111/j.1365-2362.2008.02010.x] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Atherosclerosis is potentiated by stimulation of Toll-like receptors (TLRs), which serve to detect pathogen associated molecular patterns (PAMPs). However little is known of which PAMPs may be present in atheroma, or capable of stimulating inflammatory signalling in vascular cells. MATERIALS AND METHODS DNA extracted from human carotid atheroma samples was amplified and sequenced using broad-range 16S gene specific primers to establish historical exposure to bacterial PAMPs. Responsiveness of primary human arterial and venous endothelial and smooth muscle cells to PAMPs specific for each of the TLRs was assessed by measurement of interleukin-8 secretion and E-selectin expression. RESULTS Extracts of atheromatous tissue stimulated little or no signalling in TLR-transfected HEK-293 cells. However, sequencing of bacterial DNA amplified from carotid atheroma revealed the presence of DNA from 17 different bacterial genera, suggesting historical exposure to bacterial lipopeptide, lipopolysaccharide and flagellin. All cells examined were responsive to the ligands of TLR3 and TLR4, poly inosine:cytosine and lipopolysaccharide. Arterial cells were responsive to a wider range of PAMPs than venous cells, being additionally responsive to bacterial flagellin and unmethylated cytosine-phosphate-guanosine DNA motifs, the ligands of TLR5 and TLR9, respectively. Cells were generally unresponsive towards the ligands of human TLR7 and TLR8, loxoribine and single stranded RNA. Only coronary artery endothelial cells expressed TLR2 mRNA and responded to the TLR2 ligand Pam(3)CSK(4). CONCLUSIONS Vascular cells are responsive to a relatively diverse range of TLR ligands and may be exposed, at least transiently, to ligands of TLR2, TLR4, TLR5 and TLR9 during the development of carotid atheroma.
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Affiliation(s)
- C Erridge
- Department of Cardiovascular Sciences, University of Leicester, Glenfield Hospital, Leicester, UK.
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