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Jacobs I, Ke BJ, Ceulemans M, Cremer J, D'Hoore A, Bislenghi G, Matteoli G, De Hertogh G, Sabino J, Ferrante M, Vermeire S, Breynaert C, Vanuytsel T, Verstockt B. Fibrostricturing Crohn's disease is marked by an increase in active eosinophils in the deeper layers. Clin Transl Gastroenterol 2024:01720094-990000000-00252. [PMID: 38690831 DOI: 10.14309/ctg.0000000000000706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Accepted: 04/17/2024] [Indexed: 05/03/2024] Open
Abstract
INTRODUCTION Approximately 50% of Crohn's disease (CD) patients develop intestinal strictures necessitating surgery. The immune cell distribution in these strictures remains uncharacterized. We aimed to identify the immune cells in intestinal strictures of CD patients. METHODS During ileocolonic resections, transmural sections of terminal ileum were sampled from 25 CD patients and 10 non-inflammatory bowel disease (IBD) controls. Macroscopically, unaffected, fibrostenotic and inflamed ileum was collected and analysed for immune cell distribution (flow cytometry) and protein expression. Collagen deposition was assessed via a Masson's Trichrome staining. Eosinophil and fibroblast co-localization was assessed through immunohistochemistry. RESULTS The Masson's Trichrome staining confirmed augmented collagen deposition in both the fibrotic as the inflamed region, though with a significant increased collagen deposition in fibrotic compared to inflamed tissue. Distinct Th1, Th2, regulatory T cells, dendritic cells and monocytes were identified in fibrotic and inflamed CD ileum compared to unaffected ileum of CD patients as non-IBD controls. Only minor differences were observed between fibrotic and inflamed tissue, with more active eosinophils in fibrotic deeper layers and increased Eosinophil Cationic Protein (ECP) protein expression in inflamed deeper layers. Lastly, no differences in eosinophil and fibroblast co-localization was observed between the different regions. CONCLUSION This study characterized immune cell distribution and protein expression in fibrotic and inflamed ileal tissue of CD patients. Immunologic, proteomic and histological data suggest inflammation and fibrosis are intertwined, with large overlap between both tissue types. However strikingly, we did identify an increased presence of active eosinophils only in the fibrotic deeper layers, suggesting their potential role in fibrosis development.
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Affiliation(s)
- Inge Jacobs
- KU Leuven, Department of Microbiology, Immunology and Transplantation, Allergy and Clinical Immunology Research Group, Leuven, Belgium
- KU Leuven, Department of Chronic Diseases and Metabolism (ChroMetA), Translational Research Centre for Gastrointestinal Disorders (TARGID), Leuven, Belgium
| | - Bo-Jun Ke
- KU Leuven, Department of Chronic Diseases and Metabolism (ChroMetA), Translational Research Centre for Gastrointestinal Disorders (TARGID), Leuven, Belgium
| | - Matthias Ceulemans
- KU Leuven, Department of Chronic Diseases and Metabolism (ChroMetA), Translational Research Centre for Gastrointestinal Disorders (TARGID), Leuven, Belgium
| | - Jonathan Cremer
- KU Leuven, Department of Microbiology, Immunology and Transplantation, Allergy and Clinical Immunology Research Group, Leuven, Belgium
| | - André D'Hoore
- University Hospitals Leuven, Department of Gastroenterology and Hepatology, Leuven, Belgium
| | - Gabriele Bislenghi
- University Hospitals Leuven, Department of Gastroenterology and Hepatology, Leuven, Belgium
| | - Gianluca Matteoli
- KU Leuven, Department of Chronic Diseases and Metabolism (ChroMetA), Translational Research Centre for Gastrointestinal Disorders (TARGID), Leuven, Belgium
| | - Gert De Hertogh
- KU Leuven, Department of Imaging and Pathology, Translational Cell & Tissue Research, Leuven, Belgium
| | - João Sabino
- KU Leuven, Department of Chronic Diseases and Metabolism (ChroMetA), Translational Research Centre for Gastrointestinal Disorders (TARGID), Leuven, Belgium
- University Hospitals Leuven, Department of Gastroenterology and Hepatology, Leuven, Belgium
| | - Marc Ferrante
- KU Leuven, Department of Chronic Diseases and Metabolism (ChroMetA), Translational Research Centre for Gastrointestinal Disorders (TARGID), Leuven, Belgium
- University Hospitals Leuven, Department of Gastroenterology and Hepatology, Leuven, Belgium
| | - Séverine Vermeire
- KU Leuven, Department of Chronic Diseases and Metabolism (ChroMetA), Translational Research Centre for Gastrointestinal Disorders (TARGID), Leuven, Belgium
- University Hospitals Leuven, Department of Gastroenterology and Hepatology, Leuven, Belgium
| | - Christine Breynaert
- KU Leuven, Department of Microbiology, Immunology and Transplantation, Allergy and Clinical Immunology Research Group, Leuven, Belgium
- University Hospitals Leuven, Department of General Internal Medicine, Leuven, Belgium
| | - Tim Vanuytsel
- KU Leuven, Department of Chronic Diseases and Metabolism (ChroMetA), Translational Research Centre for Gastrointestinal Disorders (TARGID), Leuven, Belgium
- University Hospitals Leuven, Department of Gastroenterology and Hepatology, Leuven, Belgium
| | - Bram Verstockt
- KU Leuven, Department of Chronic Diseases and Metabolism (ChroMetA), Translational Research Centre for Gastrointestinal Disorders (TARGID), Leuven, Belgium
- University Hospitals Leuven, Department of Gastroenterology and Hepatology, Leuven, Belgium
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Loi R, Ceulemans M, Wauters L, Vanuytsel T. An update on Eosinophilic Esophagitis. Acta Gastroenterol Belg 2023; 86:533-542. [PMID: 38240548 DOI: 10.51821/86.4.12001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/23/2024]
Affiliation(s)
- R Loi
- University of Cagliari, Cagliari, Italy
- Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases and Metabolism (ChroMeta), KULeuven, Leuven, Belgium
| | - M Ceulemans
- Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases and Metabolism (ChroMeta), KULeuven, Leuven, Belgium
| | - L Wauters
- Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases and Metabolism (ChroMeta), KULeuven, Leuven, Belgium
- Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium
| | - T Vanuytsel
- Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases and Metabolism (ChroMeta), KULeuven, Leuven, Belgium
- Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium
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Ceulemans M, Wauters L, Vanuytsel T. Targeting the altered duodenal microenvironment in functional dyspepsia. Curr Opin Pharmacol 2023; 70:102363. [PMID: 36963152 DOI: 10.1016/j.coph.2023.102363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 12/04/2022] [Accepted: 12/12/2022] [Indexed: 03/26/2023]
Abstract
Duodenal micro-inflammation and microbial dysregulation are increasingly recognized to play an important role in functional dyspepsia (FD) pathophysiology, previously regarded as a purely functional disorder. With current therapeutic options contested through insufficient efficacy or unfavorable adverse effects profiles, novel treatments directed to duodenal alterations could result in superior symptom control in at least a subset of patients. Indeed, recent advances in FD research provided evidence for anti-inflammatory therapies to relieve gastroduodenal symptoms by reducing duodenal eosinophils or mast cells. In addition, restoring microbial homeostasis by probiotics proved to be successful in FD. As the exact mechanisms by which these novel pharmacological approaches result in clinical benefit often remain to be elucidated, future research should focus on how immune activation and dysbiosis translate into typical FD symptomatology.
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Affiliation(s)
- Matthias Ceulemans
- Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases and Metabolism, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Lucas Wauters
- Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases and Metabolism, Katholieke Universiteit Leuven, Leuven, Belgium; Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium
| | - Tim Vanuytsel
- Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases and Metabolism, Katholieke Universiteit Leuven, Leuven, Belgium; Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium.
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Wauters L, Ceulemans M, Vanuytsel T. Duodenal Barrier and Inflammation in Dyspepsia: God is in the Details. Clin Gastroenterol Hepatol 2022; 20:2411-2413. [PMID: 34785357 DOI: 10.1016/j.cgh.2021.11.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2021] [Accepted: 11/08/2021] [Indexed: 02/07/2023]
Affiliation(s)
- Lucas Wauters
- Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium; Translational Research in Gastrointestinal Disorders, KU Leuven, Leuven, Belgium
| | - Matthias Ceulemans
- Translational Research in Gastrointestinal Disorders, KU Leuven, Leuven, Belgium
| | - Tim Vanuytsel
- Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium; Translational Research in Gastrointestinal Disorders, KU Leuven, Leuven, Belgium
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Ceulemans M, Jacobs I, Wauters L, Vanuytsel T. Immune Activation in Functional Dyspepsia: Bystander Becoming the Suspect. Front Neurosci 2022; 16:831761. [PMID: 35557605 PMCID: PMC9087267 DOI: 10.3389/fnins.2022.831761] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Accepted: 03/25/2022] [Indexed: 11/13/2022] Open
Abstract
Disorders of gut-brain interaction (DGBI), formerly termed functional gastrointestinal disorders (FGID), are highly prevalent although exact pathophysiological mechanisms remain unclear. Intestinal immune activation has been recognized, but increasing evidence supports a pivotal role for an active inflammatory state in these disorders. In functional dyspepsia (FD), marked eosinophil and mast cell infiltration has been repeatedly demonstrated and associations with symptoms emphasize the relevance of an eosinophil-mast cell axis in FD pathophysiology. In this Review, we highlight the importance of immune activation in DGBI with a focus on FD. We summarize eosinophil biology in both homeostasis and inflammatory processes. The evidence for immune activation in FD is outlined with attention to alterations on both cellular and molecular level, and how these may contribute to FD symptomatology. As DGBI are complex and multifactorial conditions, we shed light on factors associated to, and potentially influencing immune activation, including bidirectional gut-brain interaction, allergy and the microbiota. Crucial studies reveal a therapeutic benefit of treatments targeting immune activation, suggesting that specific anti-inflammatory therapies could offer renewed hope for at least a subset of DGBI patients. Lastly, we explore the future directions for DGBI research that could advance the field. Taken together, emerging evidence supports the recognition of FD as an immune-mediated organic-based disorder, challenging the paradigm of a strictly functional nature.
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Affiliation(s)
- Matthias Ceulemans
- Department of Chronic Diseases and Metabolism, Translational Research Center for Gastrointestinal Disorders (TARGID), Katholieke Universiteit Leuven, Leuven, Belgium
| | - Inge Jacobs
- Allergy and Clinical Immunology Research Group, Department of Microbiology, Immunology and Transplantation, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Lucas Wauters
- Department of Chronic Diseases and Metabolism, Translational Research Center for Gastrointestinal Disorders (TARGID), Katholieke Universiteit Leuven, Leuven, Belgium
- Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium
| | - Tim Vanuytsel
- Department of Chronic Diseases and Metabolism, Translational Research Center for Gastrointestinal Disorders (TARGID), Katholieke Universiteit Leuven, Leuven, Belgium
- Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium
- *Correspondence: Tim Vanuytsel,
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Wauters L, Ceulemans M, Schol J, Farré R, Tack J, Vanuytsel T. The Role of Leaky Gut in Functional Dyspepsia. Front Neurosci 2022; 16:851012. [PMID: 35422683 PMCID: PMC9002356 DOI: 10.3389/fnins.2022.851012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2022] [Accepted: 03/07/2022] [Indexed: 12/12/2022] Open
Abstract
Patients with functional dyspepsia (FD) complain of epigastric symptoms with no identifiable cause. Increased intestinal permeability has been described in these patients, especially in the proximal small bowel or duodenum, and was associated with mucosal immune activation and symptoms. In this review, we discuss duodenal barrier function, including techniques currently applied in FD research. We summarize the available data on duodenal permeability in FD and factors associated to increased permeability, including mucosal eosinophils, mast cells, luminal and systemic factors. While the increased influx of antigens into the duodenal mucosa could result in local immune activation, clinical evidence for a causal role of permeability is lacking in the absence of specific barrier-protective treatments. As both existing and novel treatments, including proton pump inhibitors (PPI) and pre- or probiotics may impact duodenal barrier function, it is important to recognize and study these alterations to improve the knowledge and management of FD.
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Affiliation(s)
- Lucas Wauters
- Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium
- Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases and Metabolism, KU Leuven, Leuven, Belgium
- *Correspondence: Lucas Wauters,
| | - Matthias Ceulemans
- Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases and Metabolism, KU Leuven, Leuven, Belgium
| | - Jolien Schol
- Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium
- Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases and Metabolism, KU Leuven, Leuven, Belgium
| | - Ricard Farré
- Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases and Metabolism, KU Leuven, Leuven, Belgium
| | - Jan Tack
- Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium
- Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases and Metabolism, KU Leuven, Leuven, Belgium
| | - Tim Vanuytsel
- Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium
- Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases and Metabolism, KU Leuven, Leuven, Belgium
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Wauters L, Tito RY, Ceulemans M, Lambaerts M, Accarie A, Rymenans L, Verspecht C, Toth J, Mols R, Augustijns P, Tack J, Vanuytsel T, Raes J. Duodenal Dysbiosis and Relation to the Efficacy of Proton Pump Inhibitors in Functional Dyspepsia. Int J Mol Sci 2021; 22:ijms222413609. [PMID: 34948413 PMCID: PMC8708077 DOI: 10.3390/ijms222413609] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2021] [Revised: 12/15/2021] [Accepted: 12/17/2021] [Indexed: 12/11/2022] Open
Abstract
Proton pump inhibitors (PPI) may improve symptoms in functional dyspepsia (FD) through duodenal eosinophil-reducing effects. However, the contribution of the microbiome to FD symptoms and its interaction with PPI remains elusive. Aseptic duodenal brushings and biopsies were performed before and after PPI intake (4 weeks Pantoprazole 40 mg daily, FD-starters and controls) or withdrawal (2 months, FD-stoppers) for 16S-rRNA sequencing. Between- and within-group changes in genera or diversity and associations with symptoms or duodenal factors were analyzed. In total, 30 controls, 28 FD-starters and 19 FD-stoppers were followed. Mucus-associated Porphyromonas was lower in FD-starters vs. controls and correlated with symptoms in FD and duodenal eosinophils in both groups, while Streptococcus correlated with eosinophils in controls. Although clinical and eosinophil-reducing effects of PPI therapy were unrelated to microbiota changes in FD-starters, increased Streptococcus was associated with duodenal PPI effects in controls and remained higher despite withdrawal of long-term PPI therapy in FD-stoppers. Thus, duodenal microbiome analysis demonstrated differential mucus-associated genera, with a potential role of Porphyromonas in FD pathophysiology. While beneficial effects of short-term PPI therapy were not associated with microbial changes in FD-starters, increased Streptococcus and its association with PPIeffects in controls suggest a role for duodenal dysbiosis after long-term PPI therapy.
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Affiliation(s)
- Lucas Wauters
- Department of Gastroenterology and Hepatology, University Hospitals Leuven, 3000 Leuven, Belgium; (L.W.); (J.T.)
- Translational Research in Gastrointestinal Disorders (TARGID), KU Leuven, 3000 Leuven, Belgium; (M.C.); (M.L.); (A.A.); (J.T.)
- VIB Center for Microbiology, 3000 Leuven, Belgium; (R.Y.T.); (L.R.); (C.V.)
- Department of Microbiology and Immunology, Rega Institute, KU Leuven, 3000 Leuven, Belgium
| | - Raúl Y. Tito
- VIB Center for Microbiology, 3000 Leuven, Belgium; (R.Y.T.); (L.R.); (C.V.)
- Department of Microbiology and Immunology, Rega Institute, KU Leuven, 3000 Leuven, Belgium
| | - Matthias Ceulemans
- Translational Research in Gastrointestinal Disorders (TARGID), KU Leuven, 3000 Leuven, Belgium; (M.C.); (M.L.); (A.A.); (J.T.)
| | - Maarten Lambaerts
- Translational Research in Gastrointestinal Disorders (TARGID), KU Leuven, 3000 Leuven, Belgium; (M.C.); (M.L.); (A.A.); (J.T.)
| | - Alison Accarie
- Translational Research in Gastrointestinal Disorders (TARGID), KU Leuven, 3000 Leuven, Belgium; (M.C.); (M.L.); (A.A.); (J.T.)
| | - Leen Rymenans
- VIB Center for Microbiology, 3000 Leuven, Belgium; (R.Y.T.); (L.R.); (C.V.)
- Department of Microbiology and Immunology, Rega Institute, KU Leuven, 3000 Leuven, Belgium
| | - Chloë Verspecht
- VIB Center for Microbiology, 3000 Leuven, Belgium; (R.Y.T.); (L.R.); (C.V.)
- Department of Microbiology and Immunology, Rega Institute, KU Leuven, 3000 Leuven, Belgium
| | - Joran Toth
- Translational Research in Gastrointestinal Disorders (TARGID), KU Leuven, 3000 Leuven, Belgium; (M.C.); (M.L.); (A.A.); (J.T.)
| | - Raf Mols
- Drug Delivery and Disposition, KU Leuven, 3000 Leuven, Belgium; (R.M.); (P.A.)
| | - Patrick Augustijns
- Drug Delivery and Disposition, KU Leuven, 3000 Leuven, Belgium; (R.M.); (P.A.)
| | - Jan Tack
- Department of Gastroenterology and Hepatology, University Hospitals Leuven, 3000 Leuven, Belgium; (L.W.); (J.T.)
- Translational Research in Gastrointestinal Disorders (TARGID), KU Leuven, 3000 Leuven, Belgium; (M.C.); (M.L.); (A.A.); (J.T.)
| | - Tim Vanuytsel
- Department of Gastroenterology and Hepatology, University Hospitals Leuven, 3000 Leuven, Belgium; (L.W.); (J.T.)
- Translational Research in Gastrointestinal Disorders (TARGID), KU Leuven, 3000 Leuven, Belgium; (M.C.); (M.L.); (A.A.); (J.T.)
- Correspondence: (T.V.); (J.R.)
| | - Jeroen Raes
- VIB Center for Microbiology, 3000 Leuven, Belgium; (R.Y.T.); (L.R.); (C.V.)
- Department of Microbiology and Immunology, Rega Institute, KU Leuven, 3000 Leuven, Belgium
- Correspondence: (T.V.); (J.R.)
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Wauters L, Demolder T, Ceulemans M, Matthys C, Tack J, Vanuytsel T. Nutrient intake is not associated with duodenal pathology in functional dyspepsia. Clin Nutr ESPEN 2021. [DOI: 10.1016/j.clnesp.2021.09.328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Wauters L, Ceulemans M, Lambaerts M, Accarie A, Toth J, Mols R, Augustijns P, Tack J, Vanuytsel T. Association between duodenal bile salts and gastric emptying in patients with functional dyspepsia. Gut 2021; 70:2208-2210. [PMID: 33239340 DOI: 10.1136/gutjnl-2020-323598] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 11/18/2020] [Accepted: 11/18/2020] [Indexed: 12/14/2022]
Affiliation(s)
- Lucas Wauters
- Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium.,Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases Metabolism and Ageing (ChroMetA), KU Leuven, Leuven, Belgium
| | - Matthias Ceulemans
- Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases Metabolism and Ageing (ChroMetA), KU Leuven, Leuven, Belgium
| | - Maarten Lambaerts
- Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases Metabolism and Ageing (ChroMetA), KU Leuven, Leuven, Belgium
| | - Alison Accarie
- Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases Metabolism and Ageing (ChroMetA), KU Leuven, Leuven, Belgium
| | - Joran Toth
- Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases Metabolism and Ageing (ChroMetA), KU Leuven, Leuven, Belgium
| | - Raf Mols
- Drug Delivery and Disposition, KU Leuven, Leuven, Flanders, Belgium
| | | | - Jan Tack
- Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium.,Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases Metabolism and Ageing (ChroMetA), KU Leuven, Leuven, Belgium
| | - Tim Vanuytsel
- Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium .,Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases Metabolism and Ageing (ChroMetA), KU Leuven, Leuven, Belgium
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Jacobs I, Ceulemans M, Wauters L, Breynaert C, Vermeire S, Verstockt B, Vanuytsel T. Role of Eosinophils in Intestinal Inflammation and Fibrosis in Inflammatory Bowel Disease: An Overlooked Villain? Front Immunol 2021; 12:754413. [PMID: 34737752 PMCID: PMC8560962 DOI: 10.3389/fimmu.2021.754413] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Accepted: 09/30/2021] [Indexed: 12/20/2022] Open
Abstract
Eosinophils are leukocytes which reside in the gastrointestinal tract under homeostatic conditions, except for the esophagus which is normally devoid of eosinophils. Research on eosinophils has primarily focused on anti-helminth responses and type 2 immune disorders. In contrast, the search for a role of eosinophils in chronic intestinal inflammation and fibrosis has been limited. With a shift in research focus from adaptive to innate immunity and the fact that the eosinophilic granules are filled with inflammatory mediators, eosinophils are becoming a point of interest in inflammatory bowel diseases. In the current review we summarize eosinophil characteristics and recruitment as well as the current knowledge on presence, inflammatory and pro-fibrotic functions of eosinophils in inflammatory bowel disease and other chronic inflammatory conditions, and we identify research gaps which should be covered in the future.
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Affiliation(s)
- Inge Jacobs
- Department of Microbiology, Immunology and Transplantation, Allergy and Clinical Immunology Research Group, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Matthias Ceulemans
- Department of Chronic Diseases and Metabolism, Translational Research Center for Gastrointestinal Disorders (TARGID), Katholieke Universiteit Leuven, Leuven, Belgium
| | - Lucas Wauters
- Department of Chronic Diseases and Metabolism, Translational Research Center for Gastrointestinal Disorders (TARGID), Katholieke Universiteit Leuven, Leuven, Belgium
- Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium
| | - Christine Breynaert
- Department of Microbiology, Immunology and Transplantation, Allergy and Clinical Immunology Research Group, Katholieke Universiteit Leuven, Leuven, Belgium
- Department of General Internal Medicine, Allergy and Clinical Immunology, University Hospitals Leuven, Leuven, Belgium
| | - Séverine Vermeire
- Department of Chronic Diseases and Metabolism, Translational Research Center for Gastrointestinal Disorders (TARGID), Katholieke Universiteit Leuven, Leuven, Belgium
- Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium
| | - Bram Verstockt
- Department of Chronic Diseases and Metabolism, Translational Research Center for Gastrointestinal Disorders (TARGID), Katholieke Universiteit Leuven, Leuven, Belgium
- Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium
| | - Tim Vanuytsel
- Department of Chronic Diseases and Metabolism, Translational Research Center for Gastrointestinal Disorders (TARGID), Katholieke Universiteit Leuven, Leuven, Belgium
- Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium
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Wauters L, Ceulemans M, Vanuytsel T. Duodenum at a crossroads: Key integrator of overlapping and psychological symptoms in functional dyspepsia? Neurogastroenterol Motil 2021; 33:e14262. [PMID: 34561921 DOI: 10.1111/nmo.14262] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 08/22/2021] [Accepted: 08/23/2021] [Indexed: 12/20/2022]
Abstract
The study of the interaction between gastrointestinal (GI) function and psychological features is a complex and developing field. The bidirectional communication between the gut and the brain or gut-brain axis is considered as a pivotal player in the pathogenesis of the highly prevalent functional GI disorders, including irritable bowel syndrome and functional dyspepsia (FD), which have been redefined as disorders of gut-brain interaction. However, the mechanisms through which changes in the gut alter brain functioning, feelings, and behavior remain unclear. Based on the presence of duodenal pathology in adult FD patients, Ronkainen et al. provide the first prospective evidence for duodenal eosinophils potentially driving anxiety. Also in this edition, associations between gastroduodenal pathology and rumination syndrome, which may coexist with FD, have now been confirmed in children by Friesen et al. Together these findings confirm not only the potential role of duodenal alterations in determining overlapping upper GI but also psychological symptoms, which result from bidirectional and complex interactions. In this review, we provide an overview of the recent advances in this field and highlight the novel contributions of the original studies of Ronkainen et al. and Friesen et al. to this topic.
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Affiliation(s)
- Lucas Wauters
- Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium.,Translational Research in Gastrointestinal Disorders (TARGID), KU Leuven, Leuven, Belgium
| | - Matthias Ceulemans
- Translational Research in Gastrointestinal Disorders (TARGID), KU Leuven, Leuven, Belgium
| | - Tim Vanuytsel
- Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium.,Translational Research in Gastrointestinal Disorders (TARGID), KU Leuven, Leuven, Belgium
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12
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Wauters L, Slaets H, De Paepe K, Ceulemans M, Wetzels S, Geboers K, Toth J, Thys W, Dybajlo R, Walgraeve D, Biessen E, Verbeke K, Tack J, Van de Wiele T, Hellings N, Vanuytsel T. Efficacy and safety of spore-forming probiotics in the treatment of functional dyspepsia: a pilot randomised, double-blind, placebo-controlled trial. Lancet Gastroenterol Hepatol 2021; 6:784-792. [PMID: 34358486 DOI: 10.1016/s2468-1253(21)00226-0] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 06/17/2021] [Accepted: 06/18/2021] [Indexed: 12/14/2022]
Abstract
BACKGROUND Current treatments for functional dyspepsia have limited efficacy or present safety issues. We aimed to assess spore-forming probiotics in functional dyspepsia as monotherapy or add-on therapy to long-term treatment with proton-pump inhibitors. METHODS In this single-centre, randomised, double-blind, placebo-controlled pilot trial that took place at University Hospitals Leuven (Leuven, Belgium), adult patients (≥18 years) with functional dyspepsia (as defined by Rome IV criteria, on proton-pump inhibitors or off proton-pump inhibitors) were randomly assigned (1:1) via computer-generated blocked lists, stratified by proton-pump inhibitor status, to receive 8 weeks of treatment with probiotics (Bacillus coagulans MY01 and Bacillus subtilis MY02, 2·5 × 109 colony-forming units per capsule) or placebo consumed twice per day, followed by an open-label extension phase of 8 weeks. Individuals with a history of abdominal surgery, diabetes, coeliac or inflammatory bowel disease, active psychiatric conditions, and use of immunosuppressant drugs, antibiotics, or probiotics in the past 3 months were excluded. All patients and on-site study personnel were masked to treatment allocation in the first 8 weeks. Symptoms, immune activation, and faecal microbiota were assessed and recorded. The primary endpoint was a decrease of at least 0·7 in the postprandial distress syndrome (PDS) score of the Leuven Postprandial Distress Scale in patients with a baseline PDS score of 1 or greater (at least mild symptoms), assessed in the intention-to-treat population. This study is registered with ClinicalTrials.gov, NCT04030780. FINDINGS Between June 3, 2019, and March 11, 2020, of 93 individuals assessed for eligibility, we included 68 patients with functional dyspepsia (51 [75%] women, mean age 40·1 years [SD 14·4], 34 [50%] on proton-pump inhibitors). We randomly assigned 32 participants to probiotics and 36 to placebo. The proportion of clinical responders was higher with probiotics (12 [48%] of 25) than placebo (six [20%] of 30; relative risk 1·95 [95% CI 1·07-4·11]; p=0·028). The number of patients with adverse events was similar with probiotics (five [16%] of 32) and placebo (12 [33%] of 36). Two serious adverse events occurring during the open-label phase (appendicitis and syncope in two separate patients) were assessed as unlikely to be related to the study product. INTERPRETATION In this exploratory study, B coagulans MY01 and B subtilis MY02 were efficacious and safe in the treatment of functional dyspepsia. Participants had potentially beneficial immune and microbial changes, which could provide insights into possible underlying mechanisms as future predictors or treatment targets. FUNDING MY HEALTH.
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Affiliation(s)
- Lucas Wauters
- Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium; Translational Research in Gastrointestinal Disorders, KU Leuven, Leuven, Belgium; Translational Research in Gastrointestinal Disorders, KU Leuven, Leuven, Belgium
| | - Helena Slaets
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Kim De Paepe
- Centre for Microbial Ecology and Technology, Ghent University, Ghent, Belgium
| | - Matthias Ceulemans
- Translational Research in Gastrointestinal Disorders, KU Leuven, Leuven, Belgium
| | - Suzan Wetzels
- Experimental Vascular Pathology Group, Maastricht University Medical Centre, Maastricht, Netherlands
| | - Karlien Geboers
- Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium
| | - Joran Toth
- Translational Research in Gastrointestinal Disorders, KU Leuven, Leuven, Belgium
| | | | | | - Daan Walgraeve
- Department of Gastroenterology, Jessa Ziekenhuis, Hasselt, Belgium
| | - Erik Biessen
- Experimental Vascular Pathology Group, Maastricht University Medical Centre, Maastricht, Netherlands
| | - Kristin Verbeke
- Translational Research in Gastrointestinal Disorders, KU Leuven, Leuven, Belgium
| | - Jan Tack
- Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium; Translational Research in Gastrointestinal Disorders, KU Leuven, Leuven, Belgium
| | - Tom Van de Wiele
- Centre for Microbial Ecology and Technology, Ghent University, Ghent, Belgium
| | - Niels Hellings
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Tim Vanuytsel
- Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium; Translational Research in Gastrointestinal Disorders, KU Leuven, Leuven, Belgium.
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Wauters L, Ceulemans M, Frings D, Lambaerts M, Accarie A, Toth J, Mols R, Augustijns P, De Hertogh G, Van Oudenhove L, Tack J, Vanuytsel T. Proton Pump Inhibitors Reduce Duodenal Eosinophilia, Mast Cells, and Permeability in Patients With Functional Dyspepsia. Gastroenterology 2021; 160:1521-1531.e9. [PMID: 33346007 DOI: 10.1053/j.gastro.2020.12.016] [Citation(s) in RCA: 44] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Revised: 12/02/2020] [Accepted: 12/03/2020] [Indexed: 02/06/2023]
Abstract
BACKGROUND & AIMS Despite the growing recognition of duodenal alterations in the pathophysiology of functional dyspepsia (FD), the effect and mechanism of proton pump inhibitors (PPIs) or first-line therapy remain unclear. We studied duodenal and systemic alterations in relation to PPI therapy in patients with FD and healthy volunteers (HVs). METHODS We performed a prospective interventional study assessing symptoms (Patient Assessment of Gastrointestinal Symptom Severity Index), duodenal alterations, and systemic factors in patients with FD ("FD-starters") and HVs before and after PPI therapy (pantoprazole 40 mg once daily for 4 weeks). Duodenal mucosal eosinophils, mast cells and permeability were quantified. Luminal pH and bile salts were determined in duodenal aspirates. Procedures were also performed in PPI-refractory patients with FD ("FD-stoppers") before and 8 weeks after PPI withdrawal. Between- and within-group changes from baseline and associations with duodenal or systemic factors were analyzed using linear mixed models. RESULTS The study was completed by 30 HV, 27 FD-starters, and 18 FD-stoppers. Symptoms and duodenal eosinophils, mast cells (all, P < .0001), and paracellular passage (P = .02) were significantly higher in FD-starters vs HVs and reduced with PPI therapy. Symptoms and duodenal immune cells also decreased in FD-stoppers off PPIs. In contrast, immune cells and permeability increased in HVs on PPIs. Dyspeptic symptoms correlated with eosinophils before and during PPI therapy, and increased eosinophils and permeability in HVs on PPIs were associated with changes in bile salts. CONCLUSIONS We provide the first prospective evidence for eosinophil-reducing effects as a therapeutic mechanism of PPIs in FD, with differential effects in HVs pointing to a role of luminal changes. ClinicalTrials.gov, Number: NCT03545243.
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Affiliation(s)
- Lucas Wauters
- Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium; Translational Research in Gastrointestinal Disorders, Department of Chronic Diseases, Metabolism and Ageing, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Matthias Ceulemans
- Translational Research in Gastrointestinal Disorders, Department of Chronic Diseases, Metabolism and Ageing, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Dennis Frings
- Translational Research in Gastrointestinal Disorders, Department of Chronic Diseases, Metabolism and Ageing, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Maarten Lambaerts
- Translational Research in Gastrointestinal Disorders, Department of Chronic Diseases, Metabolism and Ageing, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Alison Accarie
- Translational Research in Gastrointestinal Disorders, Department of Chronic Diseases, Metabolism and Ageing, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Joran Toth
- Translational Research in Gastrointestinal Disorders, Department of Chronic Diseases, Metabolism and Ageing, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Raf Mols
- Drug Delivery and Disposition, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Patrick Augustijns
- Drug Delivery and Disposition, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Gert De Hertogh
- Department of Pathology, University Hospitals Leuven, Leuven, Belgium
| | - Lukas Van Oudenhove
- Translational Research in Gastrointestinal Disorders, Department of Chronic Diseases, Metabolism and Ageing, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Jan Tack
- Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium; Translational Research in Gastrointestinal Disorders, Department of Chronic Diseases, Metabolism and Ageing, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Tim Vanuytsel
- Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium; Translational Research in Gastrointestinal Disorders, Department of Chronic Diseases, Metabolism and Ageing, Katholieke Universiteit Leuven, Leuven, Belgium.
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Harris M, Ceulemans M, Verstraete C, Bloemen M, Manshian B, Soenen SJ, Himmelreich U, Verbiest T, De Borggraeve WM, Parac‐Vogt TN. Ultrasmall iron oxide nanoparticles functionalized with BODIPY derivatives as potential bimodal probes for MRI and optical imaging. Nano Select 2021. [DOI: 10.1002/nano.202000022] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Affiliation(s)
- Michael Harris
- Department of Chemistry KU Leuven Celestijnenlaan 200F, Box 2404 Leuven 3001 Belgium
| | - Matthias Ceulemans
- Department of Chemistry KU Leuven Celestijnenlaan 200F, Box 2404 Leuven 3001 Belgium
| | - Charlotte Verstraete
- Department of Chemistry KU Leuven Celestijnenlaan 200D, Box 2425 Leuven 3001 Belgium
- Biomedical MRI KU Leuven O&N I Herestraat 49 ‐ box 505 Leuven 3000 Belgium
| | - Maarten Bloemen
- Department of Chemistry KU Leuven Celestijnenlaan 200D, Box 2425 Leuven 3001 Belgium
- Biomedical MRI KU Leuven O&N I Herestraat 49 ‐ box 505 Leuven 3000 Belgium
| | - Bella Manshian
- Biomedical MRI KU Leuven O&N I Herestraat 49 ‐ box 505 Leuven 3000 Belgium
| | - Stefaan J. Soenen
- Biomedical MRI KU Leuven O&N I Herestraat 49 ‐ box 505 Leuven 3000 Belgium
| | - Uwe Himmelreich
- Biomedical MRI KU Leuven O&N I Herestraat 49 ‐ box 505 Leuven 3000 Belgium
| | - Thierry Verbiest
- Department of Chemistry KU Leuven Celestijnenlaan 200D, Box 2425 Leuven 3001 Belgium
| | - Wim M. De Borggraeve
- Department of Chemistry KU Leuven Celestijnenlaan 200F, Box 2404 Leuven 3001 Belgium
| | - Tatjana N. Parac‐Vogt
- Department of Chemistry KU Leuven Celestijnenlaan 200F, Box 2404 Leuven 3001 Belgium
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15
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van Hoe K, De Fruyt J, Ceulemans M, Smits A, Lannoo L, Hompes T. [Lithium use in women with bipolar disorder during peripartum]. Tijdschr Psychiatr 2021; 63:557-564. [PMID: 34523708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
BACKGROUND Lithium use during peripartum requires careful consideration due to a risk of teratogenic effects, adverse side effects and risk of neonatal complications. However, given the effectiveness of lithium, use during the peripartum period may be indicated. AIM To provide an overview of the current evidence regarding the clinical use of lithium during peripartum, including risk of relapse in case of (dis)continuation and evolution of lithium levels. METHOD A review was performed in the Medline and ScienceDirect database. RESULTS Ten studies were included. Six studies concerned the risk of relapse in case of (dis)continuation of lithium during the peripartum. Four studies concerned the evolution of lithium levels throughout the peripartum. Lithium discontinuation during pregnancy leads to an increased risk of relapse during pregnancy and postpartum. At the same dose, lithium levels are lower than preconceptual in all trimesters. CONCLUSION Risk and benefits of lithium use during the peripartum should be carefully considered, if possible prior to conception. Close monitoring of maternal lithium levels and renal function is necessary due to significant fluctuations during peripartum.
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Ceulemans M, Wauters L, Accarie A, Vanuytsel T. Stress-induced changes in healthy mice do not reflect functional dyspepsia pathophysiology. Neurogastroenterol Motil 2020; 32:e13940. [PMID: 32671945 DOI: 10.1111/nmo.13940] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Accepted: 06/22/2020] [Indexed: 02/06/2023]
Affiliation(s)
- Matthias Ceulemans
- Translational Research in Gastrointestinal Diseases (TARGID), KU Leuven, Leuven, Belgium
| | - Lucas Wauters
- Translational Research in Gastrointestinal Diseases (TARGID), KU Leuven, Leuven, Belgium.,Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium
| | - Alison Accarie
- Translational Research in Gastrointestinal Diseases (TARGID), KU Leuven, Leuven, Belgium
| | - Tim Vanuytsel
- Translational Research in Gastrointestinal Diseases (TARGID), KU Leuven, Leuven, Belgium.,Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium
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17
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Wauters L, Burns G, Ceulemans M, Walker MM, Vanuytsel T, Keely S, Talley NJ. Duodenal inflammation: an emerging target for functional dyspepsia? Expert Opin Ther Targets 2020; 24:511-523. [PMID: 32249629 DOI: 10.1080/14728222.2020.1752181] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Introduction: Functional dyspepsia (FD) is one of the most common functional gastrointestinal disorders and is classified into postprandial distress and epigastric pain syndrome. Despite the recognition of duodenal inflammation as a potential trigger of symptoms, only limited anti-inflammatory therapies exist.Areas covered: This narrative review summarizes the recent advances in the pathophysiology and treatment of FD; it identifies potential therapeutic targets and gaps in the field. An electronic literature search was conducted in Pubmed up to 31st of December 2019.Expert opinion: There is compelling evidence for the role of duodenal inflammation and the eosinophil-mast cell axis in the pathogenesis of dyspeptic symptoms. Traditional prokinetic drugs and neuromodulators target gastric dysmotility and visceral hypersensitivity but are hampered by limited efficacy and side effects. Independent of acid suppression, the anti-inflammatory action of proton pump inhibitors, which remain the first-line therapy in FD, may also explain their therapeutic effect. Other existing and newly established anti-inflammatory drugs should be investigated while trials including probiotics and selective antibiotics should examine the host microbiome and immune activation. Targeted treatments for potential causes of duodenal pathology, such as impaired permeability and dysbiosis, are likely to emerge in the future.
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Affiliation(s)
- Lucas Wauters
- Translational Research in Gastrointestinal Diseases (TARGID), KU Leuven, Leuven, Belgium.,Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium
| | - Grace Burns
- Faculty of Health and Medicine, University of Newcastle and Hunter Medical Research Institute, Callaghan, Australia
| | - Matthias Ceulemans
- Translational Research in Gastrointestinal Diseases (TARGID), KU Leuven, Leuven, Belgium
| | - Marjorie M Walker
- Faculty of Health and Medicine, University of Newcastle and Hunter Medical Research Institute, Callaghan, Australia
| | - Tim Vanuytsel
- Translational Research in Gastrointestinal Diseases (TARGID), KU Leuven, Leuven, Belgium.,Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium
| | - Simon Keely
- Faculty of Health and Medicine, University of Newcastle and Hunter Medical Research Institute, Callaghan, Australia.,Vaccine and Asthma (VIVA) Program, Hunter Medical Research Institute, Callaghan, Australia
| | - Nicholas J Talley
- Faculty of Health and Medicine, University of Newcastle and Hunter Medical Research Institute, Callaghan, Australia
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Ceulemans M, Debroye E, Vander Elst L, De Borggraeve W, Parac‐Vogt TN. Luminescence and Relaxometric Properties of Heteropolymetallic Metallostar Complexes with Selectively Incorporated Lanthanide(III) Ions. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500648] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Matthias Ceulemans
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium, http://chem.kuleuven.be/lbc/
| | - Elke Debroye
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium, http://chem.kuleuven.be/lbc/
| | - Luce Vander Elst
- Department of General, Organic and Biomedical Chemistry, University of Mons, Place du Parc 23, 7000 Mons, Belgium
| | - Wim De Borggraeve
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium, http://chem.kuleuven.be/lbc/
| | - Tatjana N. Parac‐Vogt
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium, http://chem.kuleuven.be/lbc/
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Bloemen M, Vanpraet L, Ceulemans M, Parac-Vogt TN, Clays K, Geukens N, Gils A, Verbiest T. Selective protein purification by PEG–IDA-functionalized iron oxide nanoparticles. RSC Adv 2015. [DOI: 10.1039/c5ra11614g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A new heterobifunctional PEG ligand was developed for efficient magnetic purification of His-tagged proteins.
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Affiliation(s)
- M. Bloemen
- KU Leuven
- Department of Chemistry
- 3001 Heverlee
- Belgium
| | - L. Vanpraet
- KU Leuven
- Department of Chemistry
- 3001 Heverlee
- Belgium
| | - M. Ceulemans
- KU Leuven
- Department of Chemistry
- 3001 Heverlee
- Belgium
| | | | - K. Clays
- KU Leuven
- Department of Chemistry
- 3001 Heverlee
- Belgium
| | - N. Geukens
- PharmAbs
- The KU Leuven Antibody Center
- KU Leuven
- 3000 Leuven
- Belgium
| | - A. Gils
- KU Leuven
- Department of Pharmaceutical and Pharmacological Sciences
- 3000 Leuven
- Belgium
| | - T. Verbiest
- KU Leuven
- Department of Chemistry
- 3001 Heverlee
- Belgium
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Debroye E, Ceulemans M, Vander Elst L, Laurent S, Muller RN, Parac-Vogt TN. Controlled Synthesis of a Novel Heteropolymetallic Complex with Selectively Incorporated Lanthanide(III) Ions. Inorg Chem 2014; 53:1257-9. [DOI: 10.1021/ic402643a] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Elke Debroye
- Department
of Chemistry, KULeuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
| | - Matthias Ceulemans
- Department
of Chemistry, KULeuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
| | - Luce Vander Elst
- Department of General, Organic and Biomedical Chemistry, University of Mons, Place du Parc 23, 7000 Mons, Belgium
| | - Sophie Laurent
- Department of General, Organic and Biomedical Chemistry, University of Mons, Place du Parc 23, 7000 Mons, Belgium
| | - Robert N. Muller
- Department of General, Organic and Biomedical Chemistry, University of Mons, Place du Parc 23, 7000 Mons, Belgium
- Center for Microscopy and Molecular Imaging (CMMI), 6041 Gosselies, Belgium
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Affiliation(s)
- M. Hendrickx
- Department of Chemistry, University of Leuven, Celestijnenlaan 200F, B-3001 Heverlee-Leuven, Belgium
| | - M. Ceulemans
- Department of Chemistry, University of Leuven, Celestijnenlaan 200F, B-3001 Heverlee-Leuven, Belgium
| | - K. Gong
- Department of Chemistry, University of Leuven, Celestijnenlaan 200F, B-3001 Heverlee-Leuven, Belgium
| | - L. Vanquickenborne
- Department of Chemistry, University of Leuven, Celestijnenlaan 200F, B-3001 Heverlee-Leuven, Belgium
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Hendrickx M, Ceulemans M, Gong K, Vanquickenborne L. Theoretical Study on the Stability of Low-Spin Hydridomethyl Complexes of the First-Row Transition Metal Cations. J Phys Chem A 1997. [DOI: 10.1021/jp962754z] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M. Hendrickx
- Department of Chemistry, University of Leuven, Celestijnenlaan 200F, B-3001 Heverlee-leuven, Belgium
| | - M. Ceulemans
- Department of Chemistry, University of Leuven, Celestijnenlaan 200F, B-3001 Heverlee-leuven, Belgium
| | - K. Gong
- Department of Chemistry, University of Leuven, Celestijnenlaan 200F, B-3001 Heverlee-leuven, Belgium
| | - L. Vanquickenborne
- Department of Chemistry, University of Leuven, Celestijnenlaan 200F, B-3001 Heverlee-leuven, Belgium
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Paneli M, Rosenberg E, Grasserbauer M, Ceulemans M, Adams F. Assessment of organolead species in the Austrian Danube-basin using GC-MIP-AED. ACTA ACUST UNITED AC 1997. [DOI: 10.1007/s002160050244] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Jiang G, Ceulemans M, Adams F. Optimization study for the speciation analysis of organotin and organogermanium compounds by on-column capillary gas chromatography with flame photometric detection using quartz surface-induced luminescence. J Chromatogr A 1996. [DOI: 10.1016/0021-9673(95)01099-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Ceulemans M, Witte C, ?obi?ski R, Adams FC. Simplified sample preparation for GC speciation analysis of organotin in marine biomaterials. Appl Organomet Chem 1994. [DOI: 10.1002/aoc.590080505] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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