1
|
Zoumpoulaki M, Schanne G, Delsuc N, Preud'homme H, Quévrain E, Eskenazi N, Gazzah G, Guillot R, Seksik P, Vinh J, Lobinski R, Policar C. Deciphering the Metal Speciation in Low‐Molecular‐Weight Complexes by IMS‐MS: Application to the Detection of Manganese Superoxide Dismutase Mimics in Cell Lysates. Angew Chem Int Ed Engl 2022; 61:e202203066. [DOI: 10.1002/anie.202203066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Indexed: 11/09/2022]
Affiliation(s)
- Martha Zoumpoulaki
- Laboratoire des biomolécules (LBM) Département de chimie École normale supérieure PSL University, Sorbonne Université, CNRS 75005 Paris France
- SMBP ESPCI Paris PSL University, UMR 8249 CNRS France
- Centre de Recherche de Saint-Antoine, INSERM, UMRS 938 Sorbonne University, INSERM 75012 Paris France
| | - Gabrielle Schanne
- Laboratoire des biomolécules (LBM) Département de chimie École normale supérieure PSL University, Sorbonne Université, CNRS 75005 Paris France
- Centre de Recherche de Saint-Antoine, INSERM, UMRS 938 Sorbonne University, INSERM 75012 Paris France
| | - Nicolas Delsuc
- Laboratoire des biomolécules (LBM) Département de chimie École normale supérieure PSL University, Sorbonne Université, CNRS 75005 Paris France
| | | | - Elodie Quévrain
- Laboratoire des biomolécules (LBM) Département de chimie École normale supérieure PSL University, Sorbonne Université, CNRS 75005 Paris France
| | | | - Géraldine Gazzah
- Laboratoire des biomolécules (LBM) Département de chimie École normale supérieure PSL University, Sorbonne Université, CNRS 75005 Paris France
| | - Regis Guillot
- ICMMO UMR CNRS 8182 Université Paris-Saclay 91405 Orsay France
| | - Philippe Seksik
- Centre de Recherche de Saint-Antoine, INSERM, UMRS 938 Sorbonne University, INSERM 75012 Paris France
- Gastroenterology Department Saint-Antoine Hospital Sorbonne Université, APHP Paris France
| | - Joelle Vinh
- SMBP ESPCI Paris PSL University, UMR 8249 CNRS France
| | - Ryszard Lobinski
- Universite de Pau, CNRS, E2S, IPREM-UMR5254, Hélioparc 64053 Pau France
- Chair of Analytical Chemistry Warsaw University of Technology, Noakowskiego 3 00-664 Warsaw Poland
| | - Clotilde Policar
- Laboratoire des biomolécules (LBM) Département de chimie École normale supérieure PSL University, Sorbonne Université, CNRS 75005 Paris France
| |
Collapse
|
2
|
Deciphering the Metal Speciation in Low‐Molecular‐Weight Complexes by IMS‐MS: Application to the Detection of Manganese Superoxide Dismutase Mimics in Cell Lysates. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202203066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
3
|
Mathieu E, Bernard AS, Ching HYV, Somogyi A, Medjoubi K, Fores JR, Bertrand HC, Vincent A, Trépout S, Guerquin-Kern JL, Scheitler A, Ivanović-Burmazović I, Seksik P, Delsuc N, Policar C. Anti-inflammatory activity of superoxide dismutase mimics functionalized with cell-penetrating peptides. Dalton Trans 2020; 49:2323-2330. [DOI: 10.1039/c9dt04619d] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A superoxide dismutase mimic was functionalized with three peptides: -R9, -RRWWRRWRR or -Fx-r-Fx-K (MPP). They were studied in intestinal epithelial cells in an inorganic cellular chemistry approach: quantification, distribution and bio-activity.
Collapse
|
4
|
Chang G, Zhang H, Wang Y, Ma N, Chandra RA, Ye G, Zhuang S, Zhu W, Shen X. Microbial community shifts elicit inflammation in the caecal mucosa via the GPR41/43 signalling pathway during subacute ruminal acidosis. BMC Vet Res 2019; 15:298. [PMID: 31426783 PMCID: PMC6700796 DOI: 10.1186/s12917-019-2031-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Accepted: 07/30/2019] [Indexed: 01/22/2023] Open
Abstract
Background Dietary structure in ruminants is closely connected with the composition of gastrointestinal microbiota. Merging study has shown that dietary induced SARA causes the alteration of microbial community in the cecum leading to the local inflammation. However, the mechanisms of cecum inflammation elicited by the shift of microbial flora in ruminants are largely unknown, and whether the development of this inflammation is modified by epigenetic modifications. Results Ten multiparous lactating goats were randomly seperated into two groups and received either a low concentrate diet (LC, 40% concentrate, n = 5) or a high concentrate diet (HC, 60% concentrate) to induce subacute ruminal acidosis (SARA). Compared with LC, HC-induced SARA altered the predominant phyla and genera, thereby increasing the concentration of lipopolysaccharide (LPS) and short chain fatty acids (SCFAs). Meanwhile, HC-induced SARA enhanced the mRNA expression of cytokines and chemokines and the expression of mRNA and protein of GPR41, GPR43, p38 and ERK1/2, while HC-induced SARA had no effect on TLR4 and p65. Furthermore, HC-induced SARA decreased the percentage of chromatin compaction and DNA methylation at the area of the promoters of GPR41 and GPR43. Conclusion This study indicated that HC diet induced SARA resulted in the alteration in the composition of cecal microbiota. This alteration increased the concentration of LPS, but failing to activate TLR4 signaling pathway due to the tolerance effect of intestinal epithelial cell to certain level of LPS, as well as elevated the concentration of SCFAs, thereby activating GPR41 and GPR43 signaling pathway to produce cytokines and chemokins and cause the cecal inflammation. And epigenetic mechanisms contributed to the development of this inflammation in the lactating goats suffering from SARA. Electronic supplementary material The online version of this article (10.1186/s12917-019-2031-5) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Guangjun Chang
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - Huanmin Zhang
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - Yan Wang
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - Nana Ma
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - Roy Animesh Chandra
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - Gengping Ye
- Ranch Management Department, Bright Farming Co.,Ltd, Shanghai, China
| | - Su Zhuang
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - Weiyun Zhu
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - Xiangzhen Shen
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu, China.
| |
Collapse
|
5
|
Han C, Guan Q, Guo L, Yang Y, Ruan S, Zhang X. The effects and mechanisms of myeloid differentiation protein 2 on intestinal mucosal permeability in mice with chronic colitis. J Cell Physiol 2019; 234:21089-21099. [PMID: 31032920 DOI: 10.1002/jcp.28711] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Revised: 04/10/2019] [Accepted: 04/10/2019] [Indexed: 12/21/2022]
Abstract
The present study was designed to investigate the mechanism of myeloid differentiation protein 2 (MD2) on intestinal mucosa destruction in mice with chronic colitis. Briefly, a chronic colitis mouse model was established by the administration of dextran sulfate sodium (DSS) in transgenic mice of MD2 overexpression (Transgenic, MD2-Tg) and C57BL/6 wild-type mice (MD2-WT). In addition, Caco-2 cells were cultured to form a monolayer cell model in vitro. The small interfering RNA was utilized to silence the MD2 gene in Caco-2 cells, and tumor necrosis factor-α (TNF-α) was used to establish the model of intestinal mucosal inflammation. After DSS induction, the intestinal mucosal tissue inflammation was more severe in MD2-Tg mice than MD2-WT. In addition, the intestinal mucosa was severely damaged, the intestinal mucosal permeability was increased, bacterial translocation was obvious, and the expression levels of MD2, MyD88, Toll-like receptor 4 (TLR4), and HMGB1 in mucosal tissues were significantly increased, while the expression levels of tight junction proteins, occludin, and claudin-1 were significantly lower in MD2-Tg mice compared with those in MD2-WT mice. TNF-α could induce inflammatory apoptosis in Caco-2 cell models. After MD2 silencing, the apoptotic level was decreased, the value of transepithelial electrical resistance was increased, the permeability of intestinal mucosa was decreased, the cellular expression levels of MD2, MyD88, TLR4, and HMGB1 were decreased, while the expression levels of tight junction proteins, occludin and claudin-1 were increased. MD2 could aggravate the destruction of intestinal mucosa in chronic colitis through the HMGB1-TLR4-MyD88 pathway.
Collapse
Affiliation(s)
- Chenyang Han
- Department of Pharmacy, The Second Affiliated Hospital of Jiaxing University, Jiaxing, China
| | - Qiaobing Guan
- Department of Gastroenterology, The Second Affiliated Hospital of Jiaxing University, Jiaxing, China
| | - Li Guo
- Department of Center Laboratory, The Second Affiliated Hospital of Jiaxing University, Jiaxing, China
| | - Yi Yang
- Department of Pharmacy, The Second Affiliated Hospital of Jiaxing University, Jiaxing, China
| | - Shuiliang Ruan
- Department of Gastroenterology, The Second Affiliated Hospital of Jiaxing University, Jiaxing, China
| | - Xiaoling Zhang
- Department of Gastroenterology, The Second Affiliated Hospital of Jiaxing University, Jiaxing, China
| |
Collapse
|
6
|
Mathieu E, Bernard AS, Delsuc N, Quévrain E, Gazzah G, Lai B, Chain F, Langella P, Bachelet M, Masliah J, Seksik P, Policar C. A Cell-Penetrant Manganese Superoxide Dismutase (MnSOD) Mimic Is Able To Complement MnSOD and Exerts an Antiinflammatory Effect on Cellular and Animal Models of Inflammatory Bowel Diseases. Inorg Chem 2017; 56:2545-2555. [PMID: 28198622 DOI: 10.1021/acs.inorgchem.6b02695] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Inorganic complexes are increasingly used for biological and medicinal applications, and the question of the cell penetration and distribution of metallodrugs is key to understanding their biological activity. Oxidative stress is known to be involved in inflammation and in inflammatory bowel diseases for which antioxidative defenses are weakened. We report here the study of the manganese complex Mn1 mimicking superoxide dismutase (SOD), a protein involved in cell protection against oxidative stress, using an approach in inorganic cellular chemistry combining the investigation of Mn1 intracellular speciation using mass spectrometry and of its quantification and distribution using electron paramagnetic resonance and spatially resolved X-ray fluorescence with evaluation of its biological activity. More precisely, we have looked for and found the MS signature of Mn1 in cell lysates and quantified the overall manganese content. Intestinal epithelial cells activated by bacterial lipopolysaccharide were taken as a cellular model of oxidative stress and inflammation. DNBS-induced colitis in mice was used to investigate Mn1 activity in vivo. Mn1 exerts an intracellular antiinflammatory activity, remains at least partially coordinated, with diffuse distribution over the whole cell, and functionally complements mitochondrial MnSOD.
Collapse
Affiliation(s)
- Emilie Mathieu
- Département de Chimie, Ecole Normale Superieure, PSL Research University, UPMC Univ Paris 06, CNRS, Laboratoire des Biomolecules (LBM), 24 rue Lhomond, 75005 Paris, France
| | - Anne-Sophie Bernard
- Département de Chimie, Ecole Normale Superieure, PSL Research University, UPMC Univ Paris 06, CNRS, Laboratoire des Biomolecules (LBM), 24 rue Lhomond, 75005 Paris, France
| | - Nicolas Delsuc
- Département de Chimie, Ecole Normale Superieure, PSL Research University, UPMC Univ Paris 06, CNRS, Laboratoire des Biomolecules (LBM), 24 rue Lhomond, 75005 Paris, France
| | - Elodie Quévrain
- Département de Chimie, Ecole Normale Superieure, PSL Research University, UPMC Univ Paris 06, CNRS, Laboratoire des Biomolecules (LBM), 24 rue Lhomond, 75005 Paris, France
| | - Géraldine Gazzah
- Département de Chimie, Ecole Normale Superieure, PSL Research University, UPMC Univ Paris 06, CNRS, Laboratoire des Biomolecules (LBM), 24 rue Lhomond, 75005 Paris, France
| | - Barry Lai
- X-ray Science Division, Argonne National Laboratory (ANL) , Argonne, Illinois 60439, United States
| | - Florian Chain
- Commensal and Probiotics-Host Interactions Laboratory, Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, F-78350 Jouy-en-Josas, France
| | - Philippe Langella
- Commensal and Probiotics-Host Interactions Laboratory, Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, F-78350 Jouy-en-Josas, France
| | - Maria Bachelet
- Sorbonne Universites, UPMC Univ Paris 06 - Département de Chimie, Ecole Normale Superieure, PSL Research University - CNRS, INSERM, APHP, INRA, Laboratoire des Biomolecules (LBM), 27 rue de Chaligny, 75012 Paris, France.,Commensal and Probiotics-Host Interactions Laboratory, Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, F-78350 Jouy-en-Josas, France
| | - Joelle Masliah
- Département de Chimie, Ecole Normale Superieure, PSL Research University, UPMC Univ Paris 06, CNRS, Laboratoire des Biomolecules (LBM), 24 rue Lhomond, 75005 Paris, France.,Sorbonne Universites, UPMC Univ Paris 06 - Département de Chimie, Ecole Normale Superieure, PSL Research University - CNRS, INSERM, APHP, INRA, Laboratoire des Biomolecules (LBM), 27 rue de Chaligny, 75012 Paris, France
| | - Philippe Seksik
- Sorbonne Universites, UPMC Univ Paris 06 - Département de Chimie, Ecole Normale Superieure, PSL Research University - CNRS, INSERM, APHP, INRA, Laboratoire des Biomolecules (LBM), 27 rue de Chaligny, 75012 Paris, France.,Commensal and Probiotics-Host Interactions Laboratory, Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, F-78350 Jouy-en-Josas, France
| | - Clotilde Policar
- Département de Chimie, Ecole Normale Superieure, PSL Research University, UPMC Univ Paris 06, CNRS, Laboratoire des Biomolecules (LBM), 24 rue Lhomond, 75005 Paris, France
| |
Collapse
|
7
|
Cardiolipins Act as a Selective Barrier to Toll-Like Receptor 4 Activation in the Intestine. Appl Environ Microbiol 2016; 82:4264-78. [PMID: 27208127 DOI: 10.1128/aem.00463-16] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Accepted: 05/01/2016] [Indexed: 12/21/2022] Open
Abstract
UNLABELLED Intestinal homeostasis mechanisms must protect the host intestinal tissue from endogenous lipopolysaccharides (LPSs) produced by the intestinal microbiota. In this report, we demonstrate that murine intestinal fecal lipids effectively block Toll-like receptor 4 (TLR4) responses to naturally occurring Bacteroidetes sp. LPS. Cardiolipin (CL) represents a significant proportion of the total intestinal and fecal lipids and, furthermore, potently antagonizes TLR4 activation by reducing LPS binding at the lipopolysaccharide binding protein (LBP), CD14, and MD-2 steps of the TLR4 signaling pathway. It is further demonstrated that intestinal lipids and CL are less effective at neutralizing more potent Enterobacteriaceae-type LPS, which is enriched in feces obtained from mice with dextran sodium sulfate (DSS)-treated inflammatory bowel disease. The selective inhibition of naturally occurring LPS structures by intestinal lipids may represent a novel homeostasis mechanism that blocks LPS activation in response to symbiotic but not dysbiotic microbial communities. IMPORTANCE The guts of animals harbor a variety of Gram-negative bacteria associated with both states of intestinal health and states of disease. Environmental factors, such as dietary habits, can drive the microbial composition of the host animal's intestinal bacterial community toward a more pathogenic state. Both beneficial and harmful Gram-negative bacteria are capable of eliciting potentially damaging inflammatory responses from the host intestinal tissues via a lipopolysaccharide (LPS)-dependent pathway. Physical mucosal barriers and antibodies produced by the intestinal immune system protect against the undesired inflammatory effects of LPS, although it is unknown why some bacteria are more effective at overcoming the protective barriers than others. This report describes the discovery of a lipid-type protective barrier in the intestine that reduces the deleterious effects of LPSs from beneficial bacteria but is less effective in dampening the inflammatory effects of LPSs from harmful bacteria, providing a novel mechanistic insight into inflammatory intestinal disorders.
Collapse
|
8
|
Mathias GP, Garcia MD, Neves FS. CD11b expression on polymorphonuclear leukocytes from patients with ankylosing spondylitis in a lipopolysaccharide-stimulated whole blood ex vivo
model. Int J Rheum Dis 2013; 20:60-67. [DOI: 10.1111/1756-185x.12255] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
9
|
Abstract
Intestinal epithelial cells were once thought to be inert, non-responsive cells that simply acted as a physical barrier that prevents the contents of the intestinal lumen from accessing the underlying tissue. However, it is now clear that these cells express a full repertoire of Toll- and Nod-like receptors, and that their activation by components of the microbiota is vital for the development of a functional epithelium, maintenance of barrier integrity, and defense against pathogenic organisms. Additionally, mounting evidence suggests that epithelial sensing of bacteria plays a significant role in the management of the numbers and types of microbes present in the gut microbiota via the production of antimicrobial peptides and other microbe-modulatory products. This is a critical process, as it is now becoming apparent that alterations in the composition of the microbiota can predispose an individual to a wide variety of chronic diseases. In this review, we will discuss the bacterial pattern recognition receptors that are known to be expressed by the intestinal epithelium, and how each of them individually contributes to these vital protective functions. Moreover, we will review what is known about the communication between epithelial cells and various classes of underlying leukocytes, and discuss how they interact with the microbiota to form a three-part relationship that maintains homeostasis in the gut.
Collapse
|
10
|
Yu Y, Liu ZQ, Liu XY, Yang L, Geng XR, Yang G, Liu ZG, Zheng PY, Yang PC. Stress-Derived Corticotropin Releasing Factor Breaches Epithelial Endotoxin Tolerance. PLoS One 2013; 8:e65760. [PMID: 23840363 PMCID: PMC3686760 DOI: 10.1371/journal.pone.0065760] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2012] [Accepted: 04/29/2013] [Indexed: 01/27/2023] Open
Abstract
BACKGROUND AND AIMS Loss of the endotoxin tolerance of intestinal epithelium contributes to a number of intestinal diseases. The etiology is not clear. Psychological stress is proposed to compromise the intestinal barrier function. The present study aims to elucidate the role of the stress-derived corticotropin releasing factor (CRF) in breaching the established intestinal epithelial endotoxin tolerance. METHODS Epithelial cells of HT-29, T84 and MDCK were exposed to lipopolysaccharide to induce the endotoxin tolerance; the cells were then stimulated with CRF. The epithelial barrier function was determined using as indicators of the endotoxin tolerant status. A water-avoid stress mouse model was employed to test the role of CRF in breaching the established endotoxin tolerance in the intestine. RESULTS The established endotoxin tolerance in the epithelial cell monolayers was broken down by a sequent exposure to CRF and LPS manifesting a marked drop of the transepithelial resistance (TER) and an increase in the permeability to a macromolecular tracer, horseradish peroxidase (HRP). The exposure to CRF also increased the expression of Cldn2 in the epithelial cells, which could be mimicked by over expression of TLR4 in epithelial cells. Over expression of Cldn2 resulted in low TER in epithelial monolayers and high permeability to HRP. After treating mice with the 10-day chronic stress, the intestinal epithelial barrier function was markedly compromised, which could be prevented by blocking either CRF, or TLR4, or Cldn2. CONCLUSIONS Psychological stress-derived CRF can breach the established endotoxin tolerance in the intestinal mucosa.
Collapse
Affiliation(s)
- Yong Yu
- Department of Gastroenterology, the Second Hospital, Zhengzhou University, Zhengzhou, China
| | - Zhi-Qiang Liu
- Department of Gastroenterology, the Second Hospital, Zhengzhou University, Zhengzhou, China
| | - Xiao-Yu Liu
- Allergy & Immunology Institute, Shenzhen University School of Medicine, Shenzhen, China
| | - Li Yang
- Department of Gastroenterology, the Second Hospital, Zhengzhou University, Zhengzhou, China
| | - Xiao-Rui Geng
- Longgang Central Hospital, ENT Hospital and Shenzhen ENT Institute, Shenzhen, China
| | - Gui Yang
- Longgang Central Hospital, ENT Hospital and Shenzhen ENT Institute, Shenzhen, China
| | - Zhi-Gang Liu
- Allergy & Immunology Institute, Shenzhen University School of Medicine, Shenzhen, China
| | - Peng-Yuan Zheng
- Department of Gastroenterology, the Second Hospital, Zhengzhou University, Zhengzhou, China
- * E-mail: (PYZ); (PCY)
| | - Ping-Chang Yang
- Allergy & Immunology Institute, Shenzhen University School of Medicine, Shenzhen, China
- * E-mail: (PYZ); (PCY)
| |
Collapse
|
11
|
Ismail Y, Lee H, Riordan SM, Grimm MC, Zhang L. The effects of oral and enteric Campylobacter concisus strains on expression of TLR4, MD-2, TLR2, TLR5 and COX-2 in HT-29 cells. PLoS One 2013; 8:e56888. [PMID: 23437263 PMCID: PMC3577652 DOI: 10.1371/journal.pone.0056888] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2012] [Accepted: 01/18/2013] [Indexed: 01/02/2023] Open
Abstract
Campylobacter concisus, a Gram-negative bacterium that colonizes the human oral cavity, has been shown to be associated with inflammatory bowel diseases (IBD). The effects of different C. concisus strains on intestinal epithelial expression of Toll like receptors (TLR) have not been investigated. This study examined the effects of C. concisus strains isolated from patients with IBD and controls on expression of TLR4, its co-receptor myeloid differentiation factor (MD)-2; TLR2, TLR5, cyclooxygenase-2 (COX-2) and interleukin (IL)-8 in HT-29 cells.Fourteen oral and enteric C. concisus strains isolated from patients with IBD and healthy controls were co-incubated with HT-29 cells. Expression of TLR4, MD-2, TLR2, TLR5 and COX-2 in HT-29 cells in response to C. concisus infection was examined by Western blot, flow cytometry analysis and immunofluorescent staining visualized by confocal microscope. Production of IL-8 was evaluated by enzyme-linked immunosorbent assay.Both oral and enteric C. concisus strains upregulated expression of TLR4 in HT-29 cells. The levels of glycosylated TLR4 (Gly-TLR4) and surface TLR4 induced by C. concisus strains isolated from patients with IBD were significantly higher than those induced by C. concisus strains isolated from the healthy controls. Four C. concisus strains isolated from patients with IBD induced more than two-fold increase of surface expression of MD-2. C. concisus did not affect expression of TLR2 and TLR5. All C. concisus strains induced production of IL-8 and COX-2 in HT-29 cells.This study shows that some C. concisus strains, most from patients with IBD, upregulate surface expression of TLR4 and MD-2 in HT-29 cells. These data suggest that a potential role of specific C. concisus strains in modulating the intestinal epithelial responses to bacterial LPS needs to be investigated.
Collapse
Affiliation(s)
- Yazan Ismail
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, New South Whales, Australia
| | - Hoyul Lee
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, New South Whales, Australia
| | - Stephen M. Riordan
- Gastrointestinal and Liver Unit, The Prince of Wales Hospital, Sydney, New South Whales, Australia
- Faculty of Medicine, University of New South Wales, Sydney, New South Whales, Australia
| | - Michael C. Grimm
- St George Clinical School, University of New South Wales, Sydney, New South Whales, Australia
| | - Li Zhang
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, New South Whales, Australia
| |
Collapse
|
12
|
Trøseid M, Lind A, Nowak P, Barqasho B, Heger B, Lygren I, Pedersen KK, Kanda T, Funaoka H, Damås JK, Kvale D. Circulating levels of HMGB1 are correlated strongly with MD2 in HIV-infection: possible implication for TLR4-signalling and chronic immune activation. Innate Immun 2012; 19:290-7. [PMID: 23070967 DOI: 10.1177/1753425912461042] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Progressive HIV infection is characterized by profound enterocyte damage, microbial translocation and chronic immune activation. We aimed to test whether High Mobility Group Box protein 1(HMGB1), a marker of cell death, alone, or in combination with LPS, might contribute to HIV-associated immune activation and progression. Altogether, 29 untreated HIV-infected individuals, 25 inflammatory bowel disease (IBD) patients and 30 controls were included. HIV-infected patients had lower plasma LPS levels than IBD patients, but higher levels of soluble CD14 and Myeloid Differentiation (MD) 2, which interacts with TLR4 to initiate LPS-signalling. Furthermore, plasma levels of HMGB1 and MD2 were correlated directly within the HIV-infected cohort (r = 0.89, P < 0.001) and the IBD-cohort (r = 0.85, P < 0.001), implying HMGB1 signalling through the MD2/TLR4-pathway. HMGB1 and LPS, although not inter-correlated, were both moderately (r = 0.4) correlated with CD38 density on CD8+ T cells in HIV progressors. The highest levels of CD38 density and MD2 were found in progressors with plasma levels of both LPS and HMGB1 above the fiftieth percentile. Our results could imply that, in some patients, immune activation is triggered by microbial translocation, in some by cell death and in some by HMGB1 in complex with bacterial products through activation of the MD2/TLR4-pathway.
Collapse
Affiliation(s)
- Marius Trøseid
- Department of Infectious Diseases, Oslo University Hospital, 0424 Oslo, Norway.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Bergeron V, Grondin V, Rajca S, Maubert MA, Pigneur B, Thomas G, Trugnan G, Beaugerie L, Cosnes J, Masliah J, Sokol H, Seksik P, Bachelet M. Current smoking differentially affects blood mononuclear cells from patients with Crohn's disease and ulcerative colitis: relevance to its adverse role in the disease. Inflamm Bowel Dis 2012; 18:1101-11. [PMID: 21987436 DOI: 10.1002/ibd.21889] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2011] [Accepted: 08/12/2011] [Indexed: 01/08/2023]
Abstract
BACKGROUND Epidemiologic data suggest that smoking increases the risk and the severity of Crohn's disease (CD), although it may protect patients with ulcerative colitis (UC). To investigate this paradox, we evaluated the effect of cigarette smoke in the function of blood mononuclear cells from healthy subjects and patients with CD or UC in flare up. METHODS The production of mediators associated with inflammation but also with protective functions was evaluated by enzyme-linked immunosorbent assay (ELISA) and enzyme immunoassay (EIA), following either in vivo or in vitro exposure to cigarette smoke. RESULTS We found that mononuclear cells from smokers with CD were functionally impaired. These cells secreted lower levels of chemokines and cytokines as compared with nonsmoker counterparts, whereas healthy smokers or smokers with UC were not affected. Similar findings were noted after in vitro exposure to cigarette smoke extract. In addition, cells from patients with CD who smoke presented a defective sensitivity to antiinflammatory or antioxidant protection, and particularly synthesized lower levels of cytoprotective Hsp70. The effects observed were not due to diminished cell viability. Our experiments suggest that cigarette smoke-related responses were largely dependent on oxidative stress generated, and not on the nicotine component. CONCLUSIONS Overall, our data point out the presence of biological differences between blood mononuclear cells from patients with CD and UC toward cigarette smoke that might support its opposite role in both diseases.
Collapse
|