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Baeten P, Hamad I, Hoeks C, Hiltensperger M, Van Wijmeersch B, Popescu V, Aly L, Somers V, Korn T, Kleinewietfeld M, Hellings N, Broux B. Rapamycin rescues loss of function in blood-brain barrier-interacting Tregs. JCI Insight 2024; 9:e167457. [PMID: 38386413 DOI: 10.1172/jci.insight.167457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Accepted: 02/15/2024] [Indexed: 02/24/2024] Open
Abstract
In autoimmunity, FOXP3+ Tregs skew toward a proinflammatory, nonsuppressive phenotype and are, therefore, unable to control the exaggerated autoimmune response. This largely affects the success of autologous Treg therapy, which is currently under investigation for autoimmune diseases, including multiple sclerosis (MS). There is a need to ensure in vivo Treg stability before successful application of Treg therapy. Using genetic fate-mapping mice, we demonstrate that inflammatory, cytokine-expressing exFOXP3 T cells accumulate in the CNS during experimental autoimmune encephalomyelitis. In a human in vitro model, we discovered that interaction with inflamed blood-brain barrier endothelial cells (BBB-ECs) induces loss of function by Tregs. Transcriptome and cytokine analysis revealed that in vitro migrated Tregs have disrupted regenerative potential and a proinflammatory Th1/17 signature, and they upregulate the mTORC1 signaling pathway. In vitro treatment of migrated human Tregs with the clinically approved mTORC1 inhibitor rapamycin restored suppression. Finally, flow cytometric analysis indicated an enrichment of inflammatory, less-suppressive CD49d+ Tregs in the cerebrospinal fluid of people with MS. In summary, interaction with BBB-ECs is sufficient to affect Treg function, and transmigration triggers an additive proinflammatory phenotype switch. These insights help improve the efficacy of autologous Treg therapy of MS.
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Affiliation(s)
- Paulien Baeten
- Universitair MS Centrum, Campus Diepenbeek, Belgium
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Ibrahim Hamad
- Universitair MS Centrum, Campus Diepenbeek, Belgium
- VIB Laboratory of Translational Immunomodulation, Center for Inflammation Research (IRC), Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Cindy Hoeks
- Universitair MS Centrum, Campus Diepenbeek, Belgium
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Michael Hiltensperger
- Klinikum Rechts der Isar, Institute for Experimental Neuroimmunology, Technische Universität München, Munich, Germany
| | - Bart Van Wijmeersch
- Universitair MS Centrum, Campus Pelt, Belgium
- Noorderhart, Revalidatie & MS Centrum, Pelt, Belgium
| | - Veronica Popescu
- Universitair MS Centrum, Campus Pelt, Belgium
- Noorderhart, Revalidatie & MS Centrum, Pelt, Belgium
| | - Lilian Aly
- Klinikum Rechts der Isar, Institute for Experimental Neuroimmunology, Technische Universität München, Munich, Germany
| | - Veerle Somers
- Universitair MS Centrum, Campus Diepenbeek, Belgium
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Thomas Korn
- Klinikum Rechts der Isar, Institute for Experimental Neuroimmunology, Technische Universität München, Munich, Germany
- Munich Cluster for Systems Neurology (SyNergy), Munich, Germany
| | - Markus Kleinewietfeld
- Universitair MS Centrum, Campus Diepenbeek, Belgium
- VIB Laboratory of Translational Immunomodulation, Center for Inflammation Research (IRC), Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Niels Hellings
- Universitair MS Centrum, Campus Diepenbeek, Belgium
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Bieke Broux
- Universitair MS Centrum, Campus Diepenbeek, Belgium
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
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Hamad I, Ranque S, Azhar EI, Yasir M, Jiman-Fatani AA, Tissot-Dupont H, Raoult D, Bittar F. Retraction Note: Culturomics and Amplicon-based Metagenomic Approaches for the Study of Fungal Population in Human Gut Microbiota. Sci Rep 2024; 14:7771. [PMID: 38565623 PMCID: PMC10987476 DOI: 10.1038/s41598-024-58471-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2024] Open
Affiliation(s)
- Ibrahim Hamad
- Aix Marseille University, AP-HM, URMITE, IHU Méditerranée Infection, IRD 198, Inserm 1095, 7278, CNRSMarseille, France
- Charmo Research Center, Charmo University, 46023, Chamchamal, Sulaimani, Iraq
| | - Stéphane Ranque
- Aix Marseille University, AP-HM, URMITE, IHU Méditerranée Infection, IRD 198, Inserm 1095, 7278, CNRSMarseille, France
| | - Esam I Azhar
- Special Infectious Agents Unit, King Fahd Medical Research Centre, King Abdulaziz University, Jeddah, Saudi Arabia
- Department of Medical Laboratory Technology, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Muhammad Yasir
- Special Infectious Agents Unit, King Fahd Medical Research Centre, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Asif A Jiman-Fatani
- Special Infectious Agents Unit, King Fahd Medical Research Centre, King Abdulaziz University, Jeddah, Saudi Arabia
- Department of Medical Microbiology and Parasitology, Faculty of Medicine, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Hervé Tissot-Dupont
- Aix Marseille University, AP-HM, URMITE, IHU Méditerranée Infection, IRD 198, Inserm 1095, 7278, CNRSMarseille, France
| | - Didier Raoult
- Aix Marseille University, AP-HM, URMITE, IHU Méditerranée Infection, IRD 198, Inserm 1095, 7278, CNRSMarseille, France
| | - Fadi Bittar
- Aix Marseille University, AP-HM, URMITE, IHU Méditerranée Infection, IRD 198, Inserm 1095, 7278, CNRSMarseille, France.
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Beckers L, Baeten P, Popescu V, Swinnen D, Cardilli A, Hamad I, Van Wijmeersch B, Tavernier SJ, Kleinewietfeld M, Broux B, Fraussen J, Somers V. Alterations in the innate and adaptive immune system in a real-world cohort of multiple sclerosis patients treated with ocrelizumab. Clin Immunol 2024; 259:109894. [PMID: 38185268 DOI: 10.1016/j.clim.2024.109894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 12/22/2023] [Accepted: 01/03/2024] [Indexed: 01/09/2024]
Abstract
B cell depletion by the anti-CD20 antibody ocrelizumab is effective in relapsing-remitting (RR) and primary progressive (PP) multiple sclerosis (MS). We investigated immunological changes in peripheral blood of a real-world MS cohort after 6 and 12 months of ocrelizumab. All RRMS and most PPMS patients (15/20) showed treatment response. Ocrelizumab not only reduced CD20+ B cells, but also numbers of CD20+ T cells. Absolute numbers of monocytes, dendritic cells and CD8+ T cells were increased, while CD56hi natural killer cells were reduced after ocrelizumab. The residual B cell population shifted towards transitional and activated, IgA+ switched memory B cells, double negative B cells, and antibody-secreting cells. Delaying the treatment interval by 2-3 months increased mean B cell frequencies and enhanced naive B cell repopulation. Ocrelizumab reduced plasma levels of interleukin(IL)-12p70 and interferon(IFN)-α2. These findings will contribute to understanding ineffective treatment responses, dealing with life-threatening infections and further unravelling MS pathogenesis.
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Affiliation(s)
- L Beckers
- University MS Center (UMSC), Hasselt-Pelt, Hasselt, Belgium; Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Hasselt, Belgium
| | - P Baeten
- University MS Center (UMSC), Hasselt-Pelt, Hasselt, Belgium; Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Hasselt, Belgium
| | - V Popescu
- University MS Center (UMSC), Hasselt-Pelt, Hasselt, Belgium; Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Hasselt, Belgium; Noorderhart, Rehabilitation and MS Center, Pelt, Belgium
| | - D Swinnen
- University MS Center (UMSC), Hasselt-Pelt, Hasselt, Belgium; Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Hasselt, Belgium; VIB Laboratory of Translational Immunomodulation, Center for Inflammation Research (IRC), Diepenbeek, Belgium
| | - A Cardilli
- University MS Center (UMSC), Hasselt-Pelt, Hasselt, Belgium; Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Hasselt, Belgium; VIB Laboratory of Translational Immunomodulation, Center for Inflammation Research (IRC), Diepenbeek, Belgium
| | - I Hamad
- University MS Center (UMSC), Hasselt-Pelt, Hasselt, Belgium; Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Hasselt, Belgium; VIB Laboratory of Translational Immunomodulation, Center for Inflammation Research (IRC), Diepenbeek, Belgium
| | - B Van Wijmeersch
- University MS Center (UMSC), Hasselt-Pelt, Hasselt, Belgium; Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Hasselt, Belgium; Noorderhart, Rehabilitation and MS Center, Pelt, Belgium
| | - S J Tavernier
- Department of Internal Medicine and Pediatrics, Ghent University, Ghent, Belgium; Unit of Molecular Signal Transduction in Inflammation, VIB-UGent Center for Inflammation Research (IRC), Ghent, Belgium
| | - M Kleinewietfeld
- University MS Center (UMSC), Hasselt-Pelt, Hasselt, Belgium; Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Hasselt, Belgium; VIB Laboratory of Translational Immunomodulation, Center for Inflammation Research (IRC), Diepenbeek, Belgium
| | - B Broux
- University MS Center (UMSC), Hasselt-Pelt, Hasselt, Belgium; Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Hasselt, Belgium
| | - J Fraussen
- University MS Center (UMSC), Hasselt-Pelt, Hasselt, Belgium; Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Hasselt, Belgium
| | - V Somers
- University MS Center (UMSC), Hasselt-Pelt, Hasselt, Belgium; Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Hasselt, Belgium.
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Haesen S, Jager MM, Brillouet A, de Laat I, Vastmans L, Verghote E, Delaet A, D’Haese S, Hamad I, Kleinewietfeld M, Mebis J, Mullens W, Lambrichts I, Wolfs E, Deluyker D, Bito V. Pyridoxamine Limits Cardiac Dysfunction in a Rat Model of Doxorubicin-Induced Cardiotoxicity. Antioxidants (Basel) 2024; 13:112. [PMID: 38247537 PMCID: PMC10812466 DOI: 10.3390/antiox13010112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 01/10/2024] [Accepted: 01/14/2024] [Indexed: 01/23/2024] Open
Abstract
The use of doxorubicin (DOX) chemotherapy is restricted due to dose-dependent cardiotoxicity. Pyridoxamine (PM) is a vitamin B6 derivative with favorable effects on diverse cardiovascular diseases, suggesting a cardioprotective effect on DOX-induced cardiotoxicity. The cardioprotective nature of PM was investigated in a rat model of DOX-induced cardiotoxicity. Six-week-old female Sprague Dawley rats were treated intravenously with 2 mg/kg DOX or saline (CTRL) weekly for eight weeks. Two other groups received PM via the drinking water next to DOX (DOX+PM) or saline (CTRL+PM). Echocardiography, strain analysis, and hemodynamic measurements were performed to evaluate cardiac function. Fibrotic remodeling, myocardial inflammation, oxidative stress, apoptosis, and ferroptosis were evaluated by various in vitro techniques. PM significantly attenuated DOX-induced left ventricular (LV) dilated cardiomyopathy and limited TGF-β1-related LV fibrotic remodeling and macrophage-driven myocardial inflammation. PM protected against DOX-induced ferroptosis, as evidenced by restored DOX-induced disturbance of redox balance, improved cytosolic and mitochondrial iron regulation, and reduced mitochondrial damage at the gene level. In conclusion, PM attenuated the development of cardiac damage after DOX treatment by reducing myocardial fibrosis, inflammation, and mitochondrial damage and by restoring redox and iron regulation at the gene level, suggesting that PM may be a novel cardioprotective strategy for DOX-induced cardiomyopathy.
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Affiliation(s)
- Sibren Haesen
- UHasselt, Faculty of Medicine and Life Sciences, Biomedical Research Institute (BIOMED), Agoralaan, 3590 Diepenbeek, Belgium; (S.H.); (M.M.J.); (A.B.); (I.d.L.); (L.V.); (E.V.); (A.D.); (S.D.); (I.H.); (M.K.); (J.M.); (W.M.); (I.L.); (E.W.); (D.D.)
| | - Manon Marie Jager
- UHasselt, Faculty of Medicine and Life Sciences, Biomedical Research Institute (BIOMED), Agoralaan, 3590 Diepenbeek, Belgium; (S.H.); (M.M.J.); (A.B.); (I.d.L.); (L.V.); (E.V.); (A.D.); (S.D.); (I.H.); (M.K.); (J.M.); (W.M.); (I.L.); (E.W.); (D.D.)
| | - Aline Brillouet
- UHasselt, Faculty of Medicine and Life Sciences, Biomedical Research Institute (BIOMED), Agoralaan, 3590 Diepenbeek, Belgium; (S.H.); (M.M.J.); (A.B.); (I.d.L.); (L.V.); (E.V.); (A.D.); (S.D.); (I.H.); (M.K.); (J.M.); (W.M.); (I.L.); (E.W.); (D.D.)
| | - Iris de Laat
- UHasselt, Faculty of Medicine and Life Sciences, Biomedical Research Institute (BIOMED), Agoralaan, 3590 Diepenbeek, Belgium; (S.H.); (M.M.J.); (A.B.); (I.d.L.); (L.V.); (E.V.); (A.D.); (S.D.); (I.H.); (M.K.); (J.M.); (W.M.); (I.L.); (E.W.); (D.D.)
| | - Lotte Vastmans
- UHasselt, Faculty of Medicine and Life Sciences, Biomedical Research Institute (BIOMED), Agoralaan, 3590 Diepenbeek, Belgium; (S.H.); (M.M.J.); (A.B.); (I.d.L.); (L.V.); (E.V.); (A.D.); (S.D.); (I.H.); (M.K.); (J.M.); (W.M.); (I.L.); (E.W.); (D.D.)
| | - Eline Verghote
- UHasselt, Faculty of Medicine and Life Sciences, Biomedical Research Institute (BIOMED), Agoralaan, 3590 Diepenbeek, Belgium; (S.H.); (M.M.J.); (A.B.); (I.d.L.); (L.V.); (E.V.); (A.D.); (S.D.); (I.H.); (M.K.); (J.M.); (W.M.); (I.L.); (E.W.); (D.D.)
| | - Anouk Delaet
- UHasselt, Faculty of Medicine and Life Sciences, Biomedical Research Institute (BIOMED), Agoralaan, 3590 Diepenbeek, Belgium; (S.H.); (M.M.J.); (A.B.); (I.d.L.); (L.V.); (E.V.); (A.D.); (S.D.); (I.H.); (M.K.); (J.M.); (W.M.); (I.L.); (E.W.); (D.D.)
| | - Sarah D’Haese
- UHasselt, Faculty of Medicine and Life Sciences, Biomedical Research Institute (BIOMED), Agoralaan, 3590 Diepenbeek, Belgium; (S.H.); (M.M.J.); (A.B.); (I.d.L.); (L.V.); (E.V.); (A.D.); (S.D.); (I.H.); (M.K.); (J.M.); (W.M.); (I.L.); (E.W.); (D.D.)
- Cardiovascular Research Institute Maastricht (CARIM), School for Cardiovascular Diseases, University of Maastricht, Universiteitssingel 50, 6229 ER Maastricht, The Netherlands
| | - Ibrahim Hamad
- UHasselt, Faculty of Medicine and Life Sciences, Biomedical Research Institute (BIOMED), Agoralaan, 3590 Diepenbeek, Belgium; (S.H.); (M.M.J.); (A.B.); (I.d.L.); (L.V.); (E.V.); (A.D.); (S.D.); (I.H.); (M.K.); (J.M.); (W.M.); (I.L.); (E.W.); (D.D.)
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research (IRC) Hasselt University, 3590 Diepenbeek, Belgium
| | - Markus Kleinewietfeld
- UHasselt, Faculty of Medicine and Life Sciences, Biomedical Research Institute (BIOMED), Agoralaan, 3590 Diepenbeek, Belgium; (S.H.); (M.M.J.); (A.B.); (I.d.L.); (L.V.); (E.V.); (A.D.); (S.D.); (I.H.); (M.K.); (J.M.); (W.M.); (I.L.); (E.W.); (D.D.)
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research (IRC) Hasselt University, 3590 Diepenbeek, Belgium
| | - Jeroen Mebis
- UHasselt, Faculty of Medicine and Life Sciences, Biomedical Research Institute (BIOMED), Agoralaan, 3590 Diepenbeek, Belgium; (S.H.); (M.M.J.); (A.B.); (I.d.L.); (L.V.); (E.V.); (A.D.); (S.D.); (I.H.); (M.K.); (J.M.); (W.M.); (I.L.); (E.W.); (D.D.)
- Department of Medical Oncology, Jessa Hospital, Stadsomvaart 11, 3500 Hasselt, Belgium
| | - Wilfried Mullens
- UHasselt, Faculty of Medicine and Life Sciences, Biomedical Research Institute (BIOMED), Agoralaan, 3590 Diepenbeek, Belgium; (S.H.); (M.M.J.); (A.B.); (I.d.L.); (L.V.); (E.V.); (A.D.); (S.D.); (I.H.); (M.K.); (J.M.); (W.M.); (I.L.); (E.W.); (D.D.)
- Department of Cardiology, Ziekenhuis Oost Limburg, Schiepse Bos 6, 3600 Genk, Belgium
| | - Ivo Lambrichts
- UHasselt, Faculty of Medicine and Life Sciences, Biomedical Research Institute (BIOMED), Agoralaan, 3590 Diepenbeek, Belgium; (S.H.); (M.M.J.); (A.B.); (I.d.L.); (L.V.); (E.V.); (A.D.); (S.D.); (I.H.); (M.K.); (J.M.); (W.M.); (I.L.); (E.W.); (D.D.)
| | - Esther Wolfs
- UHasselt, Faculty of Medicine and Life Sciences, Biomedical Research Institute (BIOMED), Agoralaan, 3590 Diepenbeek, Belgium; (S.H.); (M.M.J.); (A.B.); (I.d.L.); (L.V.); (E.V.); (A.D.); (S.D.); (I.H.); (M.K.); (J.M.); (W.M.); (I.L.); (E.W.); (D.D.)
| | - Dorien Deluyker
- UHasselt, Faculty of Medicine and Life Sciences, Biomedical Research Institute (BIOMED), Agoralaan, 3590 Diepenbeek, Belgium; (S.H.); (M.M.J.); (A.B.); (I.d.L.); (L.V.); (E.V.); (A.D.); (S.D.); (I.H.); (M.K.); (J.M.); (W.M.); (I.L.); (E.W.); (D.D.)
| | - Virginie Bito
- UHasselt, Faculty of Medicine and Life Sciences, Biomedical Research Institute (BIOMED), Agoralaan, 3590 Diepenbeek, Belgium; (S.H.); (M.M.J.); (A.B.); (I.d.L.); (L.V.); (E.V.); (A.D.); (S.D.); (I.H.); (M.K.); (J.M.); (W.M.); (I.L.); (E.W.); (D.D.)
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Moztarzadeh S, Sepic S, Hamad I, Waschke J, Radeva MY, García-Ponce A. Cortactin is in a complex with VE-cadherin and is required for endothelial adherens junction stability through Rap1/Rac1 activation. Sci Rep 2024; 14:1218. [PMID: 38216638 PMCID: PMC10786853 DOI: 10.1038/s41598-024-51269-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Accepted: 01/03/2024] [Indexed: 01/14/2024] Open
Abstract
Vascular permeability is mediated by Cortactin (Cttn) and regulated by several molecules including cyclic-adenosine-monophosphate, small Rho family GTPases and the actin cytoskeleton. However, it is unclear whether Cttn directly interacts with any of the junctional components or if Cttn intervenes with signaling pathways affecting the intercellular contacts and the cytoskeleton. To address these questions, we employed immortalized microvascular myocardial endothelial cells derived from wild-type and Cttn-knock-out mice. We found that lack of Cttn compromised barrier integrity due to fragmented membrane distribution of different junctional proteins. Moreover, immunoprecipitations revealed that Cttn is within the VE-cadherin-based adherens junction complex. In addition, lack of Cttn slowed-down barrier recovery after Ca2+ repletion. The role of Cttn for cAMP-mediated endothelial barrier regulation was analyzed using Forskolin/Rolipram. In contrast to Cttn-KO, WT cells reacted with increased transendothelial electrical resistance. Absence of Cttn disturbed Rap1 and Rac1 activation in Cttn-depleted cells. Surprisingly, despite the absence of Cttn, direct activation of Rac1/Cdc42/RhoA by CN04 increased barrier resistance and induced well-defined cortical actin and intracellular actin bundles. In summary, our data show that Cttn is required for basal barrier integrity by allowing proper membrane distribution of junctional proteins and for cAMP-mediated activation of the Rap1/Rac1 signaling pathway.
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Affiliation(s)
- Sina Moztarzadeh
- Chair of Vegetative Anatomy, Faculty of Medicine, Ludwig-Maximilians-University (LMU) Munich, Pettenkoferstraße 11, 80336, Munich, Germany
| | - Sara Sepic
- Chair of Vegetative Anatomy, Faculty of Medicine, Ludwig-Maximilians-University (LMU) Munich, Pettenkoferstraße 11, 80336, Munich, Germany
| | - Ibrahim Hamad
- Chair of Vegetative Anatomy, Faculty of Medicine, Ludwig-Maximilians-University (LMU) Munich, Pettenkoferstraße 11, 80336, Munich, Germany
| | - Jens Waschke
- Chair of Vegetative Anatomy, Faculty of Medicine, Ludwig-Maximilians-University (LMU) Munich, Pettenkoferstraße 11, 80336, Munich, Germany
| | - Mariya Y Radeva
- Chair of Vegetative Anatomy, Faculty of Medicine, Ludwig-Maximilians-University (LMU) Munich, Pettenkoferstraße 11, 80336, Munich, Germany
| | - Alexander García-Ponce
- Chair of Vegetative Anatomy, Faculty of Medicine, Ludwig-Maximilians-University (LMU) Munich, Pettenkoferstraße 11, 80336, Munich, Germany.
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Hamad I, Van Broeckhoven J, Cardilli A, Hellings N, Strowig T, Lemmens S, Hendrix S, Kleinewietfeld M. Effects of Recombinant IL-13 Treatment on Gut Microbiota Composition and Functional Recovery after Hemisection Spinal Cord Injury in Mice. Nutrients 2023; 15:4184. [PMID: 37836468 PMCID: PMC10574124 DOI: 10.3390/nu15194184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 09/06/2023] [Accepted: 09/11/2023] [Indexed: 10/15/2023] Open
Abstract
In recent years, the gut-central nervous system axis has emerged as a key factor in the pathophysiology of spinal cord injury (SCI). Interleukin-13 (IL-13) has been shown to have anti-inflammatory and neuroprotective effects in SCI. The aim of this study was to investigate the changes in microbiota composition after hemisection injury and to determine whether systemic recombinant (r)IL-13 treatment could alter the gut microbiome, indirectly promoting functional recovery. The gut microbiota composition was determined by 16S rRNA gene sequencing, and correlations between gut microbiota alterations and functional recovery were assessed. Our results showed that there were no changes in alpha diversity between the groups before and after SCI, while PERMANOVA analysis for beta diversity showed significant differences in fecal microbial communities. Phylogenetic classification of bacterial families revealed a lower abundance of the Bacteroidales S24-7 group and a higher abundance of Lachnospiraceae and Lactobacillaceae in the post-SCI group. Systemic rIL-13 treatment improved functional recovery 28 days post-injury and microbiota analysis revealed increased relative abundance of Clostridiales vadin BB60 and Acetitomaculum and decreased Anaeroplasma, Ruminiclostridium_6, and Ruminococcus compared to controls. Functional assessment with PICRUSt showed that genes related to glyoxylate cycle and palmitoleate biosynthesis-I were the predominant signatures in the rIL-13-treated group, whereas sulfolactate degradation super pathway and formaldehyde assimilation-I were enriched in controls. In conclusion, our results indicate that rIL-13 treatment promotes changes in gut microbial communities and may thereby contribute indirectly to the improvement of functional recovery in mice, possibly having important implications for the development of novel treatment options for SCI.
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Affiliation(s)
- Ibrahim Hamad
- VIB Laboratory of Translational Immunomodulation, Center for Inflammation Research (IRC), Hasselt University, 3590 Diepenbeek, Belgium (A.C.)
- Department of Immunology and Infection, Biomedical Research Institute (BIOMED), Hasselt University, 3590 Diepenbeek, Belgium; (J.V.B.); (N.H.)
| | - Jana Van Broeckhoven
- Department of Immunology and Infection, Biomedical Research Institute (BIOMED), Hasselt University, 3590 Diepenbeek, Belgium; (J.V.B.); (N.H.)
| | - Alessio Cardilli
- VIB Laboratory of Translational Immunomodulation, Center for Inflammation Research (IRC), Hasselt University, 3590 Diepenbeek, Belgium (A.C.)
- Department of Immunology and Infection, Biomedical Research Institute (BIOMED), Hasselt University, 3590 Diepenbeek, Belgium; (J.V.B.); (N.H.)
| | - Niels Hellings
- Department of Immunology and Infection, Biomedical Research Institute (BIOMED), Hasselt University, 3590 Diepenbeek, Belgium; (J.V.B.); (N.H.)
| | - Till Strowig
- Department of Microbial Immune Regulation, Helmholtz Center for Infection Research, 38124 Braunschweig, Germany
| | - Stefanie Lemmens
- Department of Immunology and Infection, Biomedical Research Institute (BIOMED), Hasselt University, 3590 Diepenbeek, Belgium; (J.V.B.); (N.H.)
| | - Sven Hendrix
- Institute for Translational Medicine, Medical School Hamburg, 20457 Hamburg, Germany
| | - Markus Kleinewietfeld
- VIB Laboratory of Translational Immunomodulation, Center for Inflammation Research (IRC), Hasselt University, 3590 Diepenbeek, Belgium (A.C.)
- Department of Immunology and Infection, Biomedical Research Institute (BIOMED), Hasselt University, 3590 Diepenbeek, Belgium; (J.V.B.); (N.H.)
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Grajchen E, Loix M, Baeten P, Côrte-Real BF, Hamad I, Vanherle S, Haidar M, Dehairs J, Broos JY, Ntambi JM, Zimmermann R, Breinbauer R, Stinissen P, Hellings N, Verberk SGS, Kooij G, Giera M, Swinnen JV, Broux B, Kleinewietfeld M, Hendriks JJA, Bogie JFJ. Fatty acid desaturation by stearoyl-CoA desaturase-1 controls regulatory T cell differentiation and autoimmunity. Cell Mol Immunol 2023; 20:666-679. [PMID: 37041314 DOI: 10.1038/s41423-023-01011-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Accepted: 03/23/2023] [Indexed: 04/13/2023] Open
Abstract
The imbalance between pathogenic and protective T cell subsets is a cardinal feature of autoimmune disorders such as multiple sclerosis (MS). Emerging evidence indicates that endogenous and dietary-induced changes in fatty acid metabolism have a major impact on both T cell fate and autoimmunity. To date, however, the molecular mechanisms that underlie the impact of fatty acid metabolism on T cell physiology and autoimmunity remain poorly understood. Here, we report that stearoyl-CoA desaturase-1 (SCD1), an enzyme essential for the desaturation of fatty acids and highly regulated by dietary factors, acts as an endogenous brake on regulatory T-cell (Treg) differentiation and augments autoimmunity in an animal model of MS in a T cell-dependent manner. Guided by RNA sequencing and lipidomics analysis, we found that the absence of Scd1 in T cells promotes the hydrolysis of triglycerides and phosphatidylcholine through adipose triglyceride lipase (ATGL). ATGL-dependent release of docosahexaenoic acid enhanced Treg differentiation by activating the nuclear receptor peroxisome proliferator-activated receptor gamma. Our findings identify fatty acid desaturation by SCD1 as an essential determinant of Treg differentiation and autoimmunity, with potentially broad implications for the development of novel therapeutic strategies and dietary interventions for autoimmune disorders such as MS.
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Affiliation(s)
- Elien Grajchen
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
- University MS Center Hasselt, Pelt, Belgium
| | - Melanie Loix
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
- University MS Center Hasselt, Pelt, Belgium
| | - Paulien Baeten
- University MS Center Hasselt, Pelt, Belgium
- Neuro-Immune Connections and Repair Lab, Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Beatriz F Côrte-Real
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
- University MS Center Hasselt, Pelt, Belgium
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research, Hasselt University, Diepenbeek, Belgium
| | - Ibrahim Hamad
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
- University MS Center Hasselt, Pelt, Belgium
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research, Hasselt University, Diepenbeek, Belgium
| | - Sam Vanherle
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
- University MS Center Hasselt, Pelt, Belgium
| | - Mansour Haidar
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
- University MS Center Hasselt, Pelt, Belgium
| | - Jonas Dehairs
- Department of Oncology, Laboratory of Lipid Metabolism and Cancer, LKI - Leuven Cancer Institute, KU Leuven - University of Leuven, Leuven, Belgium
| | - Jelle Y Broos
- Department of Molecular Cell Biology and Immunology, Amsterdam University Medical Center, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, MS Center Amsterdam, Amsterdam, The Netherlands
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden, The Netherlands
| | - James M Ntambi
- Department of Biochemistry, Department of Nutritional Sciences, University of Wisconsin-Madison, Madison, USA
| | - Robert Zimmermann
- Institute of Molecular Biosciences, University of Graz, Graz, Austria
- BioTechMed-Graz, Graz, Austria
| | - Rolf Breinbauer
- BioTechMed-Graz, Graz, Austria
- Institute of Organic Chemistry, Graz University of Technology, Graz, Austria
| | - Piet Stinissen
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
- University MS Center Hasselt, Pelt, Belgium
| | - Niels Hellings
- University MS Center Hasselt, Pelt, Belgium
- Neuro-Immune Connections and Repair Lab, Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Sanne G S Verberk
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
- University MS Center Hasselt, Pelt, Belgium
| | - Gijs Kooij
- Department of Molecular Cell Biology and Immunology, Amsterdam University Medical Center, Vrije Universiteit Amsterdam, Amsterdam Neuroscience, MS Center Amsterdam, Amsterdam, The Netherlands
| | - Martin Giera
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden, The Netherlands
| | - Johannes V Swinnen
- Department of Oncology, Laboratory of Lipid Metabolism and Cancer, LKI - Leuven Cancer Institute, KU Leuven - University of Leuven, Leuven, Belgium
| | - Bieke Broux
- University MS Center Hasselt, Pelt, Belgium
- Neuro-Immune Connections and Repair Lab, Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
- Cardiovascular Research Institute Maastricht, Department of Internal Medicine, Maastricht University, Maastricht, The Netherlands
| | - Markus Kleinewietfeld
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
- University MS Center Hasselt, Pelt, Belgium
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research, Hasselt University, Diepenbeek, Belgium
| | - Jerome J A Hendriks
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
- University MS Center Hasselt, Pelt, Belgium
| | - Jeroen F J Bogie
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium.
- University MS Center Hasselt, Pelt, Belgium.
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8
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Cardilli A, Hamad I, Dyczko A, Thijs S, Vangronsveld J, Müller DN, Rosshart SP, Kleinewietfeld M. Impact of High Salt-Intake on a Natural Gut Ecosystem in Wildling Mice. Nutrients 2023; 15:nu15071565. [PMID: 37049406 PMCID: PMC10096756 DOI: 10.3390/nu15071565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Revised: 02/27/2023] [Accepted: 03/02/2023] [Indexed: 03/28/2023] Open
Abstract
The mammalian holobiont harbors a complex and interdependent mutualistic gut bacterial community. Shifts in the composition of this bacterial consortium are known to be a key element in host health, immunity and disease. Among many others, dietary habits are impactful drivers for a potential disruption of the bacteria–host mutualistic interaction. In this context, we previously demonstrated that a high-salt diet (HSD) leads to a dysbiotic condition of murine gut microbiota, characterized by a decrease or depletion of well-known health-promoting gut bacteria. However, due to a controlled and sanitized environment, conventional laboratory mice (CLM) possess a less diverse gut microbiota compared to wild mice, leading to poor translational outcome for gut microbiome studies, since a reduced gut microbiota diversity could fail to depict the complex interdependent networks of the microbiome. Here, we evaluated the HSD effect on gut microbiota in CLM in comparison to wildling mice, which harbor a natural gut ecosystem more closely mimicking the situation in humans. Mice were treated with either control food or HSD and gut microbiota were profiled using amplicon-based methods targeting the 16S ribosomal gene. In line with previous findings, our results revealed that HSD induced significant loss of alpha diversity and extensive modulation of gut microbiota composition in CLM, characterized by the decrease in potentially beneficial bacteria from Firmicutes phylum such as the genera Lactobacillus, Roseburia, Tuzzerella, Anaerovorax and increase in Akkermansia and Parasutterella. However, HSD-treated wildling mice did not show the same changes in terms of alpha diversity and loss of Firmicutes bacteria as CLM, and more generally, wildlings exhibited only minor shifts in the gut microbiota composition upon HSD. In line with this, 16S-based functional analysis suggested only major shifts of gut microbiota ecological functions in CLM compared to wildling mice upon HSD. Our findings indicate that richer and wild-derived gut microbiota is more resistant to dietary interventions such as HSD, compared to gut microbiota of CLM, which may have important implications for future translational microbiome research.
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9
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Côrte-Real BF, Hamad I, Arroyo Hornero R, Geisberger S, Roels J, Van Zeebroeck L, Dyczko A, van Gisbergen MW, Kurniawan H, Wagner A, Yosef N, Weiss SNY, Schmetterer KG, Schröder A, Krampert L, Haase S, Bartolomaeus H, Hellings N, Saeys Y, Dubois LJ, Brenner D, Kempa S, Hafler DA, Stegbauer J, Linker RA, Jantsch J, Müller DN, Kleinewietfeld M. Sodium perturbs mitochondrial respiration and induces dysfunctional Tregs. Cell Metab 2023; 35:299-315.e8. [PMID: 36754020 DOI: 10.1016/j.cmet.2023.01.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Revised: 11/07/2022] [Accepted: 01/17/2023] [Indexed: 02/10/2023]
Abstract
FOXP3+ regulatory T cells (Tregs) are central for peripheral tolerance, and their deregulation is associated with autoimmunity. Dysfunctional autoimmune Tregs display pro-inflammatory features and altered mitochondrial metabolism, but contributing factors remain elusive. High salt (HS) has been identified to alter immune function and to promote autoimmunity. By investigating longitudinal transcriptional changes of human Tregs, we identified that HS induces metabolic reprogramming, recapitulating features of autoimmune Tregs. Mechanistically, extracellular HS raises intracellular Na+, perturbing mitochondrial respiration by interfering with the electron transport chain (ETC). Metabolic disturbance by a temporary HS encounter or complex III blockade rapidly induces a pro-inflammatory signature and FOXP3 downregulation, leading to long-term dysfunction in vitro and in vivo. The HS-induced effect could be reversed by inhibition of mitochondrial Na+/Ca2+ exchanger (NCLX). Our results indicate that salt could contribute to metabolic reprogramming and that short-term HS encounter perturb metabolic fitness and long-term function of human Tregs with important implications for autoimmunity.
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Affiliation(s)
- Beatriz F Côrte-Real
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research (IRC), Hasselt University, 3590 Diepenbeek, Belgium; Department of Immunology, Biomedical Research Institute, Hasselt University, 3590 Diepenbeek, Belgium
| | - Ibrahim Hamad
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research (IRC), Hasselt University, 3590 Diepenbeek, Belgium; Department of Immunology, Biomedical Research Institute, Hasselt University, 3590 Diepenbeek, Belgium
| | - Rebeca Arroyo Hornero
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research (IRC), Hasselt University, 3590 Diepenbeek, Belgium; Department of Immunology, Biomedical Research Institute, Hasselt University, 3590 Diepenbeek, Belgium
| | - Sabrina Geisberger
- Experimental and Clinical Research Center, a joint cooperation of Max Delbrück Center for Molecular Medicine and Charité-Universitätsmedizin Berlin, 13125 Berlin, Germany; Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin Institute for Medical Systems Biology (BIMSB), Integrative Proteomics and Metabolomics, 13125 Berlin, Germany; DZHK (German Centre for Cardiovascular Research), partner site Berlin, 10785 Berlin, Germany; Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt Universität zu Berlin, and Berlin Institute of Health, 10117 Berlin, Germany
| | - Joris Roels
- VIB-UGent Center for Inflammation Research, 9052 Gent, Belgium; VIB BioImaging Core, 9052 Gent, Belgium
| | - Lauren Van Zeebroeck
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research (IRC), Hasselt University, 3590 Diepenbeek, Belgium; Department of Immunology, Biomedical Research Institute, Hasselt University, 3590 Diepenbeek, Belgium
| | - Aleksandra Dyczko
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research (IRC), Hasselt University, 3590 Diepenbeek, Belgium; Department of Immunology, Biomedical Research Institute, Hasselt University, 3590 Diepenbeek, Belgium
| | - Marike W van Gisbergen
- The M-Lab, Department of Precision Medicine, GROW - School for Oncology and Developmental Biology, Maastricht University, 6200 MD Maastricht, the Netherlands
| | - Henry Kurniawan
- Experimental & Molecular Immunology, Department of Infection and Immunity, Luxembourg Institute of Health, 4354 Esch-sur-Alzette, Luxembourg
| | - Allon Wagner
- Department of Electrical Engineering and Computer Science, University of California, Berkeley, Berkeley, CA 94720, USA; Center for Computational Biology, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Nir Yosef
- Department of Electrical Engineering and Computer Science, University of California, Berkeley, Berkeley, CA 94720, USA; Center for Computational Biology, University of California, Berkeley, Berkeley, CA 94720, USA; Chan Zuckerberg Biohub Investigator, San Francisco, CA 94158, USA; Ragon Institute of Massachusetts General Hospital, MIT and Harvard University, Cambridge, MA 02139, USA; Department of Systems Immunology, Weizmann Institute of Science, 7610001 Rehovot, Israel
| | - Susanne N Y Weiss
- Institute of Clinical Microbiology and Hygiene, University Hospital Regensburg and University of Regensburg, 93053 Regensburg, Germany
| | - Klaus G Schmetterer
- Institute of Clinical Microbiology and Hygiene, University Hospital Regensburg and University of Regensburg, 93053 Regensburg, Germany; Department of Laboratory Medicine, Medical University of Vienna, 1090 Vienna, Austria
| | - Agnes Schröder
- Department of Orthodontics, University Hospital Regensburg, 93053 Regensburg, Germany
| | - Luka Krampert
- Institute of Clinical Microbiology and Hygiene, University Hospital Regensburg and University of Regensburg, 93053 Regensburg, Germany
| | - Stefanie Haase
- Department of Neurology, University of Regensburg, 93053 Regensburg, Germany
| | - Hendrik Bartolomaeus
- Experimental and Clinical Research Center, a joint cooperation of Max Delbrück Center for Molecular Medicine and Charité-Universitätsmedizin Berlin, 13125 Berlin, Germany; DZHK (German Centre for Cardiovascular Research), partner site Berlin, 10785 Berlin, Germany
| | - Niels Hellings
- Department of Immunology, Biomedical Research Institute, Hasselt University, 3590 Diepenbeek, Belgium
| | - Yvan Saeys
- VIB-UGent Center for Inflammation Research, 9052 Gent, Belgium
| | - Ludwig J Dubois
- The M-Lab, Department of Precision Medicine, GROW - School for Oncology and Developmental Biology, Maastricht University, 6200 MD Maastricht, the Netherlands
| | - Dirk Brenner
- Experimental & Molecular Immunology, Department of Infection and Immunity, Luxembourg Institute of Health, 4354 Esch-sur-Alzette, Luxembourg; Odense Research Center for Anaphylaxis (ORCA), Department of Dermatology and Allergy Center, Odense University Hospital, University of Southern Denmark, 5230 Odense, Denmark
| | - Stefan Kempa
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin Institute for Medical Systems Biology (BIMSB), Integrative Proteomics and Metabolomics, 13125 Berlin, Germany
| | - David A Hafler
- Departments of Neurology and Immunobiology, Yale School of Medicine, New Haven, CT 06511, USA; Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
| | - Johannes Stegbauer
- Department of Nephrology, Medical Faculty, University Hospital Düsseldorf, Heinrich-Heine University Düsseldorf, 40225 Düsseldorf, Germany
| | - Ralf A Linker
- Department of Neurology, University of Regensburg, 93053 Regensburg, Germany
| | - Jonathan Jantsch
- Institute of Clinical Microbiology and Hygiene, University Hospital Regensburg and University of Regensburg, 93053 Regensburg, Germany; Institute for Medical Microbiology, Immunology, and Hygiene, University Hospital Cologne and Faculty of Medicine, University of Cologne, 50935 Cologne, Germany
| | - Dominik N Müller
- Experimental and Clinical Research Center, a joint cooperation of Max Delbrück Center for Molecular Medicine and Charité-Universitätsmedizin Berlin, 13125 Berlin, Germany; DZHK (German Centre for Cardiovascular Research), partner site Berlin, 10785 Berlin, Germany; Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt Universität zu Berlin, and Berlin Institute of Health, 10117 Berlin, Germany; Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, 13125 Berlin, Germany
| | - Markus Kleinewietfeld
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research (IRC), Hasselt University, 3590 Diepenbeek, Belgium; Department of Immunology, Biomedical Research Institute, Hasselt University, 3590 Diepenbeek, Belgium.
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10
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Côrte-Real BF, Arroyo Hornero R, Dyczko A, Hamad I, Kleinewietfeld M. Dissecting the role of CSF2RB expression in human regulatory T cells. Front Immunol 2022; 13:1005965. [PMID: 36532080 PMCID: PMC9755334 DOI: 10.3389/fimmu.2022.1005965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 10/14/2022] [Indexed: 12/03/2022] Open
Abstract
Colony stimulating factor 2 receptor subunit beta (CSF2RB; CD131) is the common subunit of the type I cytokine receptors for granulocyte-macrophage colony-stimulating factor (GM-CSF), interleukin (IL)-3 and IL-5. Interestingly, FOXP3+ regulatory T cells (Tregs), which play a pivotal role in prevention of autoimmunity have been demonstrated to highly overexpress CSF2RB and genome-wide association studies (GWAS) identified CSF2RB as being linked to autoimmune diseases like multiple sclerosis (MS). However, the exact biological role of CD131 in human Tregs has not been defined yet. Here we investigated CD131 importance on Treg phenotype and function in a broad range of in vitro studies. Although we could not recognize a specific function of CSF2RB; CD131 in human Tregs, our data show that CD131 expression is vastly restricted to Tregs even under stimulatory conditions, indicating that CD131 could aid as a potential marker to identify Treg subpopulations from pools of activated CD4+ T cells. Importantly, our analysis further demonstrate the overexpression of CSF2RB in Tregs of patients with autoimmune diseases like MS and systemic lupus erythematosus (SLE) in comparison to healthy controls, thereby indicating that CSF2RB expression in Tregs could serve as a potential novel biomarker for disease.
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Affiliation(s)
- Beatriz F. Côrte-Real
- Vlaams Instituut voor Biotechnologie (VIB) Laboratory of Translational Immunomodulation, Vlaams Instituut voor Biotechnologie (VIB) Center for Inflammation Research (IRC), Hasselt University, Diepenbeek, Belgium,Department of Immunology, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Rebeca Arroyo Hornero
- Vlaams Instituut voor Biotechnologie (VIB) Laboratory of Translational Immunomodulation, Vlaams Instituut voor Biotechnologie (VIB) Center for Inflammation Research (IRC), Hasselt University, Diepenbeek, Belgium,Department of Immunology, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Aleksandra Dyczko
- Vlaams Instituut voor Biotechnologie (VIB) Laboratory of Translational Immunomodulation, Vlaams Instituut voor Biotechnologie (VIB) Center for Inflammation Research (IRC), Hasselt University, Diepenbeek, Belgium,Department of Immunology, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Ibrahim Hamad
- Vlaams Instituut voor Biotechnologie (VIB) Laboratory of Translational Immunomodulation, Vlaams Instituut voor Biotechnologie (VIB) Center for Inflammation Research (IRC), Hasselt University, Diepenbeek, Belgium,Department of Immunology, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Markus Kleinewietfeld
- Vlaams Instituut voor Biotechnologie (VIB) Laboratory of Translational Immunomodulation, Vlaams Instituut voor Biotechnologie (VIB) Center for Inflammation Research (IRC), Hasselt University, Diepenbeek, Belgium,Department of Immunology, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium,University Mulpitle Sclerosis Center (UMSC), Hasselt University (UHasselt)/Campus, Diepenbeek, Belgium,*Correspondence: Markus Kleinewietfeld,
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11
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Moztarzadeh S, Radeva MY, Sepic S, Schuster K, Hamad I, Waschke J, García-Ponce A. Lack of adducin impairs the stability of endothelial adherens and tight junctions and may be required for cAMP-Rac1-mediated endothelial barrier stabilization. Sci Rep 2022; 12:14940. [PMID: 36056066 PMCID: PMC9440001 DOI: 10.1038/s41598-022-18964-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [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: 04/21/2022] [Accepted: 08/23/2022] [Indexed: 11/09/2022] Open
Abstract
Adducin (Add) is an actin binding protein participating in the stabilization of actin/spectrin networks, epithelial junctional turnover and cardiovascular disorders such as hypertension. Recently, we demonstrated that Add is required for adherens junctions (AJ) integrity. Here we hypothesized that Add regulates tight junctions (TJ) as well and may play a role in cAMP-mediated barrier enhancement. We evaluated the role of Add in MyEnd cells isolated from WT and Add-Knock-Out (KO) mice. Our results indicate that the lack of Add drastically alters the junctional localization and protein levels of major AJ and TJ components, including VE-Cadherin and claudin-5. We also showed that cAMP signaling induced by treatment with forskolin and rolipram (F/R) enhances the barrier integrity of WT but not Add-KO cells. The latter showed no junctional reorganization upon cAMP increase. The absence of Add also led to higher protein levels of the small GTPases Rac1 and RhoA. In vehicle-treated cells the activation level of Rac1 did not differ significantly when WT and Add-KO cells were compared. However, the lack of Add led to increased activity of RhoA. Moreover, F/R treatment triggered Rac1 activation only in WT cells. The function of Rac1 and RhoA per se was unaffected by the total ablation of Add, since direct activation with CN04 was still possible in both cell lines and led to improved endothelial barrier function. In the current study, we demonstrate that Add is required for the maintenance of endothelial barrier by regulating both AJ and TJ. Our data show that Add may act upstream of Rac1 as it is necessary for its activation via cAMP.
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Affiliation(s)
- Sina Moztarzadeh
- Chair of Vegetative Anatomy, Faculty of Medicine, Ludwig-Maximilians-University (LMU) Munich, Pettenkoferstraße 11, 80336, Munich, Germany
| | - Mariya Y Radeva
- Chair of Vegetative Anatomy, Faculty of Medicine, Ludwig-Maximilians-University (LMU) Munich, Pettenkoferstraße 11, 80336, Munich, Germany
| | - Sara Sepic
- Chair of Vegetative Anatomy, Faculty of Medicine, Ludwig-Maximilians-University (LMU) Munich, Pettenkoferstraße 11, 80336, Munich, Germany
| | - Katharina Schuster
- Chair of Vegetative Anatomy, Faculty of Medicine, Ludwig-Maximilians-University (LMU) Munich, Pettenkoferstraße 11, 80336, Munich, Germany
| | - Ibrahim Hamad
- Chair of Vegetative Anatomy, Faculty of Medicine, Ludwig-Maximilians-University (LMU) Munich, Pettenkoferstraße 11, 80336, Munich, Germany
| | - Jens Waschke
- Chair of Vegetative Anatomy, Faculty of Medicine, Ludwig-Maximilians-University (LMU) Munich, Pettenkoferstraße 11, 80336, Munich, Germany
| | - Alexander García-Ponce
- Chair of Vegetative Anatomy, Faculty of Medicine, Ludwig-Maximilians-University (LMU) Munich, Pettenkoferstraße 11, 80336, Munich, Germany.
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12
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Arroyo-Hornero R, Aegerter H, Hamad I, Corte-Real B, Staes K, van der Woning B, Verstraete K, Savvides SN, Lambrecht BN, Kleinewietfeld M. The Charcot-Leyden crystal protein galectin-10 is not a major determinant of human regulatory T-cell function. Allergy 2022; 77:2818-2821. [PMID: 35491437 DOI: 10.1111/all.15332] [Citation(s) in RCA: 2] [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] [Received: 10/25/2021] [Revised: 04/23/2022] [Accepted: 04/28/2022] [Indexed: 01/27/2023]
Affiliation(s)
- Rebeca Arroyo-Hornero
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research (IRC), Hasselt University, Diepenbeek, Belgium.,Department of Immunology, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Helena Aegerter
- Immunoregulation Unit, VIB Center for Inflammation Research, Ghent, Belgium.,Department of Internal Medicine and Pediatrics, Ghent University, Ghent, Belgium
| | - Ibrahim Hamad
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research (IRC), Hasselt University, Diepenbeek, Belgium.,Department of Immunology, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Beatriz Corte-Real
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research (IRC), Hasselt University, Diepenbeek, Belgium.,Department of Immunology, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Katrien Staes
- Transgenic Core Facility, VIB Center for Inflammation Research, Ghent, Belgium.,Department of Biomedical Molecular Biology, Ghent University, Ghent, Belgium
| | | | - Kenneth Verstraete
- Unit for Structural Biology, VIB Center for Inflammation Research, Ghent, Belgium.,Department of Biochemistry and Microbiology, Ghent University, Ghent, Belgium
| | - Savvas N Savvides
- Unit for Structural Biology, VIB Center for Inflammation Research, Ghent, Belgium.,Department of Biochemistry and Microbiology, Ghent University, Ghent, Belgium
| | - Bart N Lambrecht
- Immunoregulation Unit, VIB Center for Inflammation Research, Ghent, Belgium.,Department of Internal Medicine and Pediatrics, Ghent University, Ghent, Belgium.,Department of Pulmonary Medicine, ErasmusMC, Rotterdam, The Netherlands
| | - Markus Kleinewietfeld
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research (IRC), Hasselt University, Diepenbeek, Belgium.,Department of Immunology, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
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13
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Sharaf B, AlMasri R, Abdel-Razeq N, Salama O, Hamad I, Abunasser M, Abdel-Razeq H. Vitiligo-Like Lesions in a Patient with Metastatic Breast Cancer Treated with Cyclin-Dependent Kinase (CDK) 4/6 Inhibitor: A Case Report and Literature Review. Clin Cosmet Investig Dermatol 2022; 15:5-10. [PMID: 35023941 PMCID: PMC8743357 DOI: 10.2147/ccid.s344867] [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] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2021] [Accepted: 12/16/2021] [Indexed: 11/23/2022]
Abstract
Background Cyclin-dependent kinase (CDK) 4/6 inhibitors have revolutionized the treatment landscape of hormone receptor-positive (HR+), human epidermal growth factor receptor 2-negative (HER2−) metastatic breast cancer, with an impressive efficacy and safety profile. Cytopenia is the main adverse event, which is both predictable and manageable. Here, we report a case of CDK4/6 inhibitor-induced vitiligo-like lesions. Vitiligo or vitiligo-like lesions are a rare adverse event; only a few cases are reported in the literature. Case Presentation A 71-year-old female patient was diagnosed initially with early-stage right breast cancer (HR+/HER2−) and was treated with breast-conserving surgery followed by chemotherapy, radiotherapy, and hormonal therapy. A few years later, she developed metastatic disease to the hilar lymph nodes, and to multiple skeletal sites, including the left scapula, left shoulder, left iliac bone, and dorsal vertebrae, for which she was treated with ribociclib and letrozole. While on treatment, she developed hypopigmented lesions involving both hands, feet, and face, which were described as vitiligo-like lesions. Conclusion CDK4/6 inhibitor-induced vitiligo is a rare and unpredictable adverse event. This case report highlights the rarity of this adverse event, the dilemma related to the optimal treatment, and decisions related to continuation, holding, or switching CDK4/6 inhibitors.
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Affiliation(s)
- Baha' Sharaf
- Department of Internal Medicine, King Hussein Cancer Center, Amman, Jordan
| | - Rama AlMasri
- Department of Internal Medicine, Istishari Hospital, Amman, Jordan
| | - Nayef Abdel-Razeq
- Department of Internal Medicine, Henry Ford Hospital, Detroit, MI, USA
| | - Osama Salama
- Department of Internal Medicine, King Hussein Cancer Center, Amman, Jordan
| | - Ibrahim Hamad
- Department of Internal Medicine, King Hussein Cancer Center, Amman, Jordan
| | - Mahmoud Abunasser
- Department of Internal Medicine, King Hussein Cancer Center, Amman, Jordan
| | - Hikmat Abdel-Razeq
- Department of Internal Medicine, King Hussein Cancer Center, Amman, Jordan.,School of Medicine, University of Jordan, Amman, Jordan
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14
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Peeters J, Thas O, Shkedy Z, Kodalci L, Musisi C, Owokotomo OE, Dyczko A, Hamad I, Vangronsveld J, Kleinewietfeld M, Thijs S, Aerts J. Exploring the Microbiome Analysis and Visualization Landscape. Front Bioinform 2021; 1:774631. [PMID: 36303773 PMCID: PMC9580862 DOI: 10.3389/fbinf.2021.774631] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2021] [Accepted: 10/29/2021] [Indexed: 02/02/2023] Open
Abstract
Research on the microbiome has boomed recently, which resulted in a wide range of tools, packages, and algorithms to analyze microbiome data. Here we investigate and map currently existing tools that can be used to perform visual analysis on the microbiome, and associate the including methods, visual representations and data features to the research objectives currently of interest in microbiome research. The analysis is based on a combination of a literature review and workshops including a group of domain experts. Both the reviewing process and workshops are based on domain characterization methods to facilitate communication and collaboration between researchers from different disciplines. We identify several research questions related to microbiomes, and describe how different analysis methods and visualizations help in tackling them.
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Affiliation(s)
- Jannes Peeters
- CENSTAT, Data Science Institute (DSI), Hasselt University, Diepenbeek, Belgium
- *Correspondence: Jannes Peeters ,
| | - Olivier Thas
- CENSTAT, Data Science Institute (DSI), Hasselt University, Diepenbeek, Belgium
| | - Ziv Shkedy
- CENSTAT, Data Science Institute (DSI), Hasselt University, Diepenbeek, Belgium
| | - Leyla Kodalci
- CENSTAT, Data Science Institute (DSI), Hasselt University, Diepenbeek, Belgium
| | - Connie Musisi
- CENSTAT, Data Science Institute (DSI), Hasselt University, Diepenbeek, Belgium
| | | | - Aleksandra Dyczko
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research (IRC), Hasselt University, Diepenbeek, Belgium
- Department of Immunology and Infection, Biomedical Research Institute (BIOMED), Hasselt University, Diepenbeek, Belgium
| | - Ibrahim Hamad
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research (IRC), Hasselt University, Diepenbeek, Belgium
- Department of Immunology and Infection, Biomedical Research Institute (BIOMED), Hasselt University, Diepenbeek, Belgium
| | - Jaco Vangronsveld
- Center for Environmental Sciences, Environmental Biology, Hasselt University, Diepenbeek, Belgium
- Department of Plant Physiology and Biophysics, Faculty of Biology and Biotechnology, Maria Curie–Skłodowska University, Lublin, Poland
| | - Markus Kleinewietfeld
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research (IRC), Hasselt University, Diepenbeek, Belgium
- Department of Immunology and Infection, Biomedical Research Institute (BIOMED), Hasselt University, Diepenbeek, Belgium
| | - Sofie Thijs
- Center for Environmental Sciences, Environmental Biology, Hasselt University, Diepenbeek, Belgium
| | - Jan Aerts
- CENSTAT, Data Science Institute (DSI), Hasselt University, Diepenbeek, Belgium
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15
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Van Zeebroeck L, Arroyo Hornero R, Côrte-Real BF, Hamad I, Meissner TB, Kleinewietfeld M. Fast and Efficient Genome Editing of Human FOXP3 + Regulatory T Cells. Front Immunol 2021; 12:655122. [PMID: 34408743 PMCID: PMC8365355 DOI: 10.3389/fimmu.2021.655122] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [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: 01/18/2021] [Accepted: 07/13/2021] [Indexed: 12/14/2022] Open
Abstract
FOXP3+ regulatory T cells (Tregs) are central for maintaining peripheral tolerance and immune homeostasis. Because of their immunosuppressive characteristics, Tregs are a potential therapeutic target in various diseases such as autoimmunity, transplantation and infectious diseases like COVID-19. Numerous studies are currently exploring the potential of adoptive Treg therapy in different disease settings and novel genome editing techniques like CRISPR/Cas will likely widen possibilities to strengthen its efficacy. However, robust and expeditious protocols for genome editing of human Tregs are limited. Here, we describe a rapid and effective protocol for reaching high genome editing efficiencies in human Tregs without compromising cell integrity, suitable for potential therapeutic applications. By deletion of IL2RA encoding for IL-2 receptor α-chain (CD25) in Tregs, we demonstrated the applicability of the method for downstream functional assays and highlighted the importance for CD25 for in vitro suppressive function of human Tregs. Moreover, deletion of IL6RA (CD126) in human Tregs elicits cytokine unresponsiveness and thus may prevent IL-6-mediated instability of Tregs, making it an attractive target to potentially boost functionality in settings of adoptive Treg therapies to contain overreaching inflammation or autoimmunity. Thus, our rapid and efficient protocol for genome editing in human Tregs may advance possibilities for Treg-based cellular therapies.
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Affiliation(s)
- Lauren Van Zeebroeck
- Vlaams Instituut voor Biotechnologie (VIB) Laboratory of Translational Immunomodulation, Vlaams Instituut voor Biotechnologie (VIB) Center for Inflammation Research (IRC), Hasselt University, Diepenbeek, Belgium
- Department of Immunology, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Rebeca Arroyo Hornero
- Vlaams Instituut voor Biotechnologie (VIB) Laboratory of Translational Immunomodulation, Vlaams Instituut voor Biotechnologie (VIB) Center for Inflammation Research (IRC), Hasselt University, Diepenbeek, Belgium
- Department of Immunology, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Beatriz F. Côrte-Real
- Vlaams Instituut voor Biotechnologie (VIB) Laboratory of Translational Immunomodulation, Vlaams Instituut voor Biotechnologie (VIB) Center for Inflammation Research (IRC), Hasselt University, Diepenbeek, Belgium
- Department of Immunology, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Ibrahim Hamad
- Vlaams Instituut voor Biotechnologie (VIB) Laboratory of Translational Immunomodulation, Vlaams Instituut voor Biotechnologie (VIB) Center for Inflammation Research (IRC), Hasselt University, Diepenbeek, Belgium
- Department of Immunology, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Torsten B. Meissner
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, United States
| | - Markus Kleinewietfeld
- Vlaams Instituut voor Biotechnologie (VIB) Laboratory of Translational Immunomodulation, Vlaams Instituut voor Biotechnologie (VIB) Center for Inflammation Research (IRC), Hasselt University, Diepenbeek, Belgium
- Department of Immunology, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
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16
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Van den Broek B, Pintelon I, Hamad I, Kessels S, Haidar M, Hellings N, Hendriks JJ, Kleinewietfeld M, Brône B, Timmerman V, Timmermans J, Somers V, Michiels L, Irobi J. Microglial derived extracellular vesicles activate autophagy and mediate multi-target signaling to maintain cellular homeostasis. J Extracell Vesicles 2020; 10:e12022. [PMID: 33708355 PMCID: PMC7890546 DOI: 10.1002/jev2.12022] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [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: 12/18/2019] [Revised: 10/05/2020] [Accepted: 10/13/2020] [Indexed: 12/27/2022] Open
Abstract
Microglia, the immunocompetent cells of the central nervous system (CNS), play an important role in maintaining cellular homeostasis in the CNS. These cells secrete immunomodulatory factors including nanovesicles and participate in the removal of cellular debris by phagocytosis or autophagy. Accumulating evidence indicates that specifically the cellular exchange of small extracellular vesicles (EVs), participates in physiology and disease through intercellular communication. However, the contribution of microglial-derived extracellular vesicles (M-EVs) to the maintenance of microglia homeostasis and how M-EVs could influence the phenotype and gene function of other microglia subtypes is unclear. In addition, knowledge of canonical signalling pathways of inflammation and immunity gene expression patterns in human microglia exposed to M-EVs is limited. Here, we analysed the effects of M-EVs produced in vitro by either tumour necrosis factor alpha (TNFα) activated or non-activated microglia BV2 cells. We showed that M-EVs are internalized by both mouse and human C20 microglia cells and that the uptake of M-EVs in microglia induced autophagic vesicles at various stages of degradation including autophagosomes and autolysosomes. Consistently, stimulation of microglia with M-EVs increased the protein expression of the autophagy marker, microtubule-associated proteins 1A/1B light chain 3B isoform II (LC3B-II), and promoted autophagic flux in live cells. To elucidate the biological activities occurring at the transcriptional level in C20 microglia stimulated with M-EVs, the gene expression profiles, potential upstream regulators, and enrichment pathways were characterized using targeted RNA sequencing. Inflammation and immunity transcriptome gene panel sequencing of both activated and normal microglia stimulated with M-EVs showed involvement of several canonical pathways and reduced expression of key genes involved in neuroinflammation, inflammasome and apoptosis signalling pathways compared to control cells. In this study, we provide the perspective that a beneficial activity of in vitro cell culture produced EVs could be the modulation of autophagy during cellular stress. Therefore, we use a monoculture system to study microglia-microglia crosstalk which is important in the prevention and propagation of inflammation in the brain. We demonstrate that in vitro produced microglial EVs are able to influence multiple biological pathways and promote activation of autophagy in order to maintain microglia survival and homeostasis.
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Affiliation(s)
| | - Isabel Pintelon
- Laboratory of Cell Biology & HistologyAntwerp Centre for Advanced Microscopy (ACAM)University of AntwerpAntwerpBelgium
| | - Ibrahim Hamad
- Biomedical Research InstituteUHasseltHasselt UniversityHasseltBelgium
- VIB Laboratory of Translational ImmunomodulationVIB Center for Inflammation ResearchHasseltBelgium
| | - Sofie Kessels
- Biomedical Research InstituteUHasseltHasselt UniversityHasseltBelgium
| | - Mansour Haidar
- Biomedical Research InstituteUHasseltHasselt UniversityHasseltBelgium
| | - Niels Hellings
- Biomedical Research InstituteUHasseltHasselt UniversityHasseltBelgium
| | | | - Markus Kleinewietfeld
- Biomedical Research InstituteUHasseltHasselt UniversityHasseltBelgium
- VIB Laboratory of Translational ImmunomodulationVIB Center for Inflammation ResearchHasseltBelgium
| | - Bert Brône
- Biomedical Research InstituteUHasseltHasselt UniversityHasseltBelgium
| | - Vincent Timmerman
- Peripheral Neuropathy Research GroupDepartment of Biomedical SciencesInstitute Born Bunge and University of AntwerpAntwerpBelgium
| | - Jean‐Pierre Timmermans
- Laboratory of Cell Biology & HistologyAntwerp Centre for Advanced Microscopy (ACAM)University of AntwerpAntwerpBelgium
| | - Veerle Somers
- Biomedical Research InstituteUHasseltHasselt UniversityHasseltBelgium
| | - Luc Michiels
- Biomedical Research InstituteUHasseltHasselt UniversityHasseltBelgium
| | - Joy Irobi
- Biomedical Research InstituteUHasseltHasselt UniversityHasseltBelgium
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17
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Kleinewietfeld M, Côrte-Real BF, Hamad I. High-salt modulates cellular metabolism of human regulatory T cells. The Journal of Immunology 2020. [DOI: 10.4049/jimmunol.204.supp.224.48] [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] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
High-salt intake has been linked with shifts in the immune cell balance, mainly by promoting proliferation and activity of pro-inflammatory cells, such as T helper 17 (Th17) and M1 macrophages, and by impairing the functions of anti-inflammatory cells such as regulatory T cells (Tregs) and M2 macrophages. However, the precise molecular mechanisms that contribute to this phenomenon are still unknown. The role of metabolic regulation in shaping immune responses has gained increasing attention in recent years and can be greatly influenced by environmental factors such as diet. High-salt intake was previously shown to promote metabolic changes in M2 macrophages by decreasing their mitochondrial oxidative phosphorylation (OXPHOS) and glycolysis necessary for their activation. So we hypothesize that this phenomenon could likely be extrapolated to other cell types such as Tregs. We analyzed changes on the metabolic pathways of human Tregs after high-salt exposure. Our results show significant salt-induced changes in the cellular metabolism of Tregs and since these changes are known to alter suppressive function both in vitro and in vivo, we further hypothesize that the observed metabolic alterations might be linked to the loss of suppressive function seen in human Tregs upon high-salt challenge. Thus, the interference with these pathways may have the potential for targeting Tregs in salt-sensitive diseases.
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Affiliation(s)
- Markus Kleinewietfeld
- 1VIB Laboratory of Translational Immunomodulation Center for Inflammation Research, Hasselt University, Belgium
| | - Beatriz F Côrte-Real
- 1VIB Laboratory of Translational Immunomodulation Center for Inflammation Research, Hasselt University, Belgium
| | - Ibrahim Hamad
- 1VIB Laboratory of Translational Immunomodulation Center for Inflammation Research, Hasselt University, Belgium
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18
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Arroyo Hornero R, Hamad I, Côrte-Real B, Kleinewietfeld M. The Impact of Dietary Components on Regulatory T Cells and Disease. Front Immunol 2020; 11:253. [PMID: 32153577 PMCID: PMC7047770 DOI: 10.3389/fimmu.2020.00253] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2019] [Accepted: 01/30/2020] [Indexed: 12/13/2022] Open
Abstract
The rise in the prevalence of autoimmune diseases in developed societies has been associated with a change in lifestyle patterns. Among other factors, increased consumption of certain dietary components, such as table salt and fatty acids and excessive caloric intake has been associated with defective immunological tolerance. Dietary nutrients have shown to modulate the immune response by a direct effect on the function of immune cells or, indirectly, by acting on the microbiome of the gastrointestinal tract. FOXP3+ regulatory T cells (Tregs) suppress immune responses and are critical for maintaining peripheral tolerance and immune homeostasis, modulating chronic tissue inflammation and autoimmune disease. It is now well-recognized that Tregs show certain degree of plasticity and can gain effector functions to adapt their regulatory function to different physiological situations during an immune response. However, plasticity of Tregs might also result in conversion into effector T cells that may contribute to autoimmune pathogenesis. Yet, which environmental cues regulate Treg plasticity and function is currently poorly understood, but it is of significant importance for therapeutic purposes. Here we review the current understanding on the effect of certain dietary nutrients that characterize Western diets in Treg metabolism, stability, and function. Moreover, we will discuss the role of Tregs linking diet and autoimmunity and the potential of dietary-based interventions to modulate Treg function in disease.
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Affiliation(s)
- Rebeca Arroyo Hornero
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research (IRC), University of Hasselt, Hasselt, Belgium
| | - Ibrahim Hamad
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research (IRC), University of Hasselt, Hasselt, Belgium
| | - Beatriz Côrte-Real
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research (IRC), University of Hasselt, Hasselt, Belgium
| | - Markus Kleinewietfeld
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research (IRC), University of Hasselt, Hasselt, Belgium
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19
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Avery EG, Balogh A, Bartolomaeus H, Löber U, Steckhan N, Markó L, Wilck N, Hamad I, Šušnjar U, Mähler A, Hohmann C, Lesker TR, Strowig T, Dechend R, Bzdok D, Kleinewietfeld M, Michalsen A, Müller DN, Forslund SK. Abstract P2072: Integrative Network Analysis Of Microbiome-Immune Axis In Metabolic Syndrome Patients During A Fasting Intervention. Hypertension 2019. [DOI: 10.1161/hyp.74.suppl_1.p2072] [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] [Indexed: 11/16/2022]
Abstract
Fasting can prolong survival and reduce disease burden in rodent models, and possibly in humans. The relationship between diet, gut microbiota, immune system and host (patho)physiology has only recently been explored, and information is lacking on how periodic fasting affects the gut microbiome in patients with metabolic syndrome (MetS). We show a 5-day fast (FAST) in humans, followed by a modified DASH diet is more effective than DASH alone (DASH) at reducing systolic blood pressure (SBP change measured by ABPM, 95% CI; FAST: [-7.053,-1.142], DASH: [-5.880,1.477]), need for antihypertensive medication (FAST: n=15 of n=35, DASH: n=6 of n=36 patients), and body-mass index at three months post intervention. Fasting altered the gut microbiome, impacting bacterial taxa and functional gene modules associated with the production of short-chain fatty acids (e.g.
Faecalibacterium prausnitzii
,
Eubacterium rectale, Coprococcus comes
), previously linked to vascular health and immunity. Immunophenotyping and cross-system analyses revealed that SBP changes correlated with circulating Il-2
+
TNFα
+
mucosa-associated invariant T (MAIT) cells (FDR-corr P(q) =0.044, Spearman’s rho=0.44), Il-17
-
IFNγ
+
MAITs (FDR-corr P(q) =0.022, Spearman’s rho=0.49), and effector CD4
+
T cells (FDR-corr P(q)=0.047, Spearman’s rho=0.43). By stratifying the fasting group into BP responders and non-responders, we identified a set of 76 microbial and 99 immune responder-specific features. Machine learning algorithms could predict long-term SBP responsiveness from baseline immunome data, identifying changes in effector CD8
+
T cells, Th17 cells and Tregs as discriminators (Single-subject prediction: 71%). This is the first high-resolution multi-omics characterization of fasting in MetS. Fasting induced long-term reduction in body weight and SBP, accompanied by changes in microbiome and immune homeostasis. Our data implicate fasting as a promising non-pharmacological intervention in MetS.
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Affiliation(s)
- Ellen G Avery
- Experimental and Clinical Rsch Cntr (Max Delbrück Cntr for Molecular Medicine & Charité Universitätsmedizin), Berlin, Germany
| | - András Balogh
- Experimental and Clinical Rsch Cntr (Max Delbrück Cntr for Molecular Medicine & Charité Universitätsmedizin), Berlin, Germany
| | - Hendrik Bartolomaeus
- Experimental and Clinical Rsch Cntr (Max Delbrück Cntr for Molecular Medicine & Charité Universitätsmedizin), Berlin, Germany
| | - Ulrike Löber
- Experimental and Clinical Rsch Cntr (Max Delbrück Cntr for Molecular Medicine & Charité Universitätsmedizin), Berlin, Germany
| | - Nico Steckhan
- Charité Universitätsmedizin & Immanuel Krankenhaus, Berlin, Germany
| | - Lajos Markó
- Experimental and Clinical Rsch Cntr (Max Delbrück Cntr for Molecular Medicine & Charité Universitätsmedizin), Berlin, Germany
| | - Nicola Wilck
- Experimental and Clinical Rsch Cntr (Max Delbrück Cntr for Molecular Medicine & Charité Universitätsmedizin), Berlin, Germany
| | - Ibrahim Hamad
- VIB Cntr for Inflammation Rsch (IRC), UHasselt, Hasselt, Belgium
| | - Urša Šušnjar
- Experimental and Clinical Rsch Cntr (Max Delbrück Cntr for Molecular Medicine & Charité Universitätsmedizin), Berlin, Germany
| | - Anja Mähler
- Experimental and Clinical Rsch Cntr (Max Delbrück Cntr for Molecular Medicine & Charité Universitätsmedizin), Berlin, Germany
| | | | - Till R Lesker
- Helmholtz Cntr for Infection Rsch, Braunschweig, Germany
| | - Till Strowig
- Helmholtz Cntr for Infection Rsch, Braunschweig, Germany
| | - Ralf Dechend
- Experimental and Clinical Rsch Cntr (Max Delbrück Cntr for Molecular Medicine & Charité Universitätsmedizin), Berlin, Germany
| | - Danilo Bzdok
- Dept of Psychiatry, Psychotherapy, and Psychosomatics, Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen Univ, Aachen, Germany
| | | | | | - Dominik N Müller
- Experimental and Clinical Rsch Cntr (Max Delbrück Cntr for Molecular Medicine & Charité Universitätsmedizin), Berlin, Germany
| | - Sofia K Forslund
- Experimental and Clinical Rsch Cntr (Max Delbrück Cntr for Molecular Medicine & Charité Universitätsmedizin), Berlin, Germany
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20
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Willebrand R, Hamad I, Van Zeebroeck L, Kiss M, Bruderek K, Geuzens A, Swinnen D, Côrte-Real BF, Markó L, Lebegge E, Laoui D, Kemna J, Kammertoens T, Brandau S, Van Ginderachter JA, Kleinewietfeld M. High Salt Inhibits Tumor Growth by Enhancing Anti-tumor Immunity. Front Immunol 2019; 10:1141. [PMID: 31214164 PMCID: PMC6557976 DOI: 10.3389/fimmu.2019.01141] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Accepted: 05/07/2019] [Indexed: 02/02/2023] Open
Abstract
Excess salt intake could affect the immune system by shifting the immune cell balance toward a pro-inflammatory state. Since this shift of the immune balance is thought to be beneficial in anti-cancer immunity, we tested the impact of high salt diets on tumor growth in mice. Here we show that high salt significantly inhibited tumor growth in two independent murine tumor transplantation models. Although high salt fed tumor-bearing mice showed alterations in T cell populations, the effect seemed to be largely independent of adaptive immune cells. In contrast, depletion of myeloid-derived suppressor cells (MDSCs) significantly reverted the inhibitory effect on tumor growth. In line with this, high salt conditions almost completely blocked murine MDSC function in vitro. Importantly, similar effects were observed in human MDSCs isolated from cancer patients. Thus, high salt conditions seem to inhibit tumor growth by enabling more pronounced anti-tumor immunity through the functional modulation of MDSCs. Our findings might have critical relevance for cancer immunotherapy.
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Affiliation(s)
- Ralf Willebrand
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research, University of Hasselt, Campus Diepenbeek, Hasselt, Belgium
| | - Ibrahim Hamad
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research, University of Hasselt, Campus Diepenbeek, Hasselt, Belgium
| | - Lauren Van Zeebroeck
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research, University of Hasselt, Campus Diepenbeek, Hasselt, Belgium
| | - Máté Kiss
- Cellular and Molecular Immunology Lab, Vrije Universiteit Brussel, Brussels, Belgium.,Myeloid Cell Immunology Lab, VIB Center for Inflammation Research, Brussels, Belgium
| | - Kirsten Bruderek
- Research Division, Department of Otorhinolaryngology, West German Cancer Center, University Hospital Essen, Essen, Germany
| | - Anneleen Geuzens
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research, University of Hasselt, Campus Diepenbeek, Hasselt, Belgium
| | - Dries Swinnen
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research, University of Hasselt, Campus Diepenbeek, Hasselt, Belgium
| | - Beatriz Fernandes Côrte-Real
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research, University of Hasselt, Campus Diepenbeek, Hasselt, Belgium
| | - Lajos Markó
- Experimental and Clinical Research Center, A Joint Cooperation of Max Delbrück Center for Molecular Medicine and Charité University Medicine Berlin, Berlin, Germany
| | - Els Lebegge
- Cellular and Molecular Immunology Lab, Vrije Universiteit Brussel, Brussels, Belgium.,Myeloid Cell Immunology Lab, VIB Center for Inflammation Research, Brussels, Belgium
| | - Damya Laoui
- Cellular and Molecular Immunology Lab, Vrije Universiteit Brussel, Brussels, Belgium.,Myeloid Cell Immunology Lab, VIB Center for Inflammation Research, Brussels, Belgium
| | - Josephine Kemna
- Institute of Immunology, Charité - Universitätsmedizin Berlin, Berlin, Germany.,Max Delbrück Center for Molecular Medicine, Berlin, Germany
| | - Thomas Kammertoens
- Institute of Immunology, Charité - Universitätsmedizin Berlin, Berlin, Germany.,Max Delbrück Center for Molecular Medicine, Berlin, Germany
| | - Sven Brandau
- Research Division, Department of Otorhinolaryngology, West German Cancer Center, University Hospital Essen, Essen, Germany
| | - Jo A Van Ginderachter
- Cellular and Molecular Immunology Lab, Vrije Universiteit Brussel, Brussels, Belgium.,Myeloid Cell Immunology Lab, VIB Center for Inflammation Research, Brussels, Belgium
| | - Markus Kleinewietfeld
- VIB Laboratory of Translational Immunomodulation, VIB Center for Inflammation Research, University of Hasselt, Campus Diepenbeek, Hasselt, Belgium
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21
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Balogh A, Steckhan N, Forslund SK, Wilck N, Hamad I, Avery EG, Šušnjar U, Hohmann C, Strowig T, Dechend R, Kleinewietfeld M, Michalsen A, Mueller DN. Abstract P372: The Effect of Periodic Fasting on Patients With Hypertension and Metabolic Syndrome. Hypertension 2018. [DOI: 10.1161/hyp.72.suppl_1.p372] [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] [Indexed: 11/16/2022]
Abstract
Periodic fasting may serve as therapeutic strategy for the management of hypertension and metabolic syndrome. We hypothesize that fasting affects the gut microbiome and promotes immune cell homeostasis resulting in lower blood pressure. Patients suffering from metabolic syndrome and hypertension were randomized either to 7-day periodic fasting combined with lifestyle change or Dietary Approaches to Stop Hypertension (DASH) intervention. Data derived from clinical parameters, 16S sequencing of the gut microbiome and immunophenotyping were collected at baseline, at day 7 and 3 months post intervention. At baseline, 21 out 30 patients in the fasting and 23 out of 31 in the DASH group had elevated systolic office blood pressure (SBP >130 mmHg), which dropped significantly by 10 mmHg after fasting, and remained lower 3 months post intervention (7 mmHg). In the DASH group, SBP significantly decreased by 12 mmHg after 1 week and 8 mmHg after 3 months. At 3 months post intervention, 24-h ABPM confirmed the decrease in fasting, but not in DASH. Fasting, but not DASH significantly reduced body weight and BMI after 7 days compared to baseline, and this effect persisted for 3 months post-intervention. Furthermore, 50 % (15/30) of patients in fasting and 23 % (7/31) in DASH were able to decrease their use of medications for treatment of metabolic syndrome. Spearman correlation tests showed that fasting, but not DASH, altered the gut microbiome. After fasting
Bacteroides
,
Lachnoclostridium
,
Coprococcus
, and
Ruminococcus
Operational Taxonomic Units (OTUs) decreased, while the
Eubacterium rectale
OTU increased. In contrast to DASH, fasting significantly reduced the frequency of CD4+ Th17 cells, active CD69+ mucosa-associated invariant T cells (MAIT) and IFNg+IL-2+ or TNFa+ MAITs indicating the anti-inflammatory effect of fasting. While some of these changes reverted to baseline after 3 months, several persisted. Despite a similar decrease in office SBP in both study arms, the periodic fasting intervention is more beneficial in reducing body weight and BMI compared to baseline. Fasting altered the prevalence of certain gut microbes and influenced immune cell signatures whereas DASH did not, suggesting a distinct role of fasting for improving cardiometabolic health.
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Affiliation(s)
- Andras Balogh
- Experimental and Clinical Rsch Cntr & Charité Universitätsmedizin Berlin & DZHK, Berlin, Germany
| | - Nico Steckhan
- Charité Universitätsmedizin Berlin & Immanuel Hosp Berlin, Berlin, Germany
| | - Sofia K Forslund
- Experimental and Clinical Rsch Cntr & Charité Universitätsmedizin Berlin & Max Delbrück Cntr for Molecular Medicine & BIH, Berlin, Germany
| | - Nicola Wilck
- Experimental and Clinical Rsch Cntr & Charité Universitätsmedizin Berlin & DZHK, Berlin, Germany
| | - Ibrahim Hamad
- VIB Cntr for Inflammation Rsch (IRC), Hasselt Univ, Diepenbeek, Netherlands
| | - Ellen G Avery
- Experimental and Clinical Rsch Cntr & Max Delbrück Cntr for Molecular Medicine, Berlin, Germany
| | - Urša Šušnjar
- Experimental and Clinical Rsch Cntr & Max Delbrück Cntr for Molecular Medicine, Berlin, Germany
| | - Christoph Hohmann
- Charité Universitätsmedizin Berlin & Immanuel Hosp Berlin, Berlin, Germany
| | - Till Strowig
- Helmholtz Cntr for Infection Rsch, Braunschweig, Germany
| | - Ralf Dechend
- Experimental and Clinical Rsch Cntr & Charite Unviersitätsmedizin Berlin & DZHK & BIH & Helios Hosp, Berlin, Germany
| | | | - Andreas Michalsen
- Charité Universitätsmedizin Berlin & Immanuel Hosp Berlin, Berlin, Germany
| | - Dominik N Mueller
- Experimental and Clinical Rsch Cntr & Max Delbrück Cntr for Molecular Medicine, Charite Unviersitätsmedizin Berlin & DZHK & BIH, Berlin, Germany
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Hui Chin Lim G, McLauglin K, Elahmin D, Babiker M, Hamad I, McArdle G. National emergency laparotomy audit in a district general hospital. Int J Surg 2018. [DOI: 10.1016/j.ijsu.2018.05.231] [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: 10/28/2022]
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Hamad I, Abou Abdallah R, Ravaux I, Mokhtari S, Tissot-Dupont H, Michelle C, Stein A, Lagier JC, Raoult D, Bittar F. Metabarcoding analysis of eukaryotic microbiota in the gut of HIV-infected patients. PLoS One 2018; 13:e0191913. [PMID: 29385188 PMCID: PMC5791994 DOI: 10.1371/journal.pone.0191913] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Accepted: 01/12/2018] [Indexed: 12/14/2022] Open
Abstract
Research on the relationship between changes in the gut microbiota and human disease, including AIDS, is a growing field. However, studies on the eukaryotic component of the intestinal microbiota have just begun and have not yet been conducted in HIV-infected patients. Moreover, eukaryotic community profiling is influenced by the use of different methodologies at each step of culture-independent techniques. Herein, initially, four DNA extraction protocols were compared to test the efficiency of each method in recovering eukaryotic DNA from fecal samples. Our results revealed that recovering eukaryotic components from fecal samples differs significantly among DNA extraction methods. Subsequently, the composition of the intestinal eukaryotic microbiota was evaluated in HIV-infected patients and healthy volunteers through clone sequencing, high-throughput sequencing of nuclear ribosomal internal transcribed spacers 1 (ITS1) and 2 (ITS2) amplicons and real-time PCRs. Our results revealed that not only richness (Chao-1 index) and alpha diversity (Shannon diversity) differ between HIV-infected patients and healthy volunteers, depending on the molecular strategy used, but also the global eukaryotic community composition, with little overlapping taxa found between techniques. Moreover, our results based on cloning libraries and ITS1/ITS2 metabarcoding sequencing showed significant differences in fungal composition between HIV-infected patients and healthy volunteers, but without distinct clusters separating the two groups. Malassezia restricta was significantly more prevalent in fecal samples of HIV-infected patients, according to cloning libraries, whereas operational taxonomic units (OTUs) belonging to Candida albicans and Candida tropicalis were significantly more abundant in fecal samples of HIV-infected patients compared to healthy subjects in both ITS subregions. Finally, real-time PCR showed the presence of Microsporidia, Giardia lamblia, Blastocystis and Hymenolepis diminuta in different proportions in fecal samples from HIV patients as compared to healthy individuals. Our work revealed that the use of different sequencing approaches can impact the perceived eukaryotic diversity results of the human gut. We also provide a more comprehensive view of the eukaryotic community in the gut of HIV-infected patients through the complementarity of the different molecular techniques used. Combining these various methodologies may provide a gold standard for a more complete characterization of the eukaryotic microbiome in future studies.
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Affiliation(s)
- Ibrahim Hamad
- Aix-Marseille Université, CNRS 7278, IRD 198, Inserm 1095, AP-HM, URMITE, IHU Méditerranée Infection, Marseille, France
- Charmo University, Charmo Research Center, Chamchamal/Sulaimani, Iraq
| | - Rita Abou Abdallah
- Aix-Marseille Université, CNRS 7278, IRD 198, Inserm 1095, AP-HM, URMITE, IHU Méditerranée Infection, Marseille, France
| | - Isabelle Ravaux
- Service de Maladies Infectieuses et tropicales, CHU de la Conception, IHU Méditerranée Infection, Marseille, France
| | - Saadia Mokhtari
- Assistance Publique Hôpitaux de Marseille, CHU Nord, Pôle Infectieux, IHU Méditerranée Infection, Marseille, France
| | - Hervé Tissot-Dupont
- Aix-Marseille Université, CNRS 7278, IRD 198, Inserm 1095, AP-HM, URMITE, IHU Méditerranée Infection, Marseille, France
| | - Caroline Michelle
- Aix-Marseille Université, CNRS 7278, IRD 198, Inserm 1095, AP-HM, URMITE, IHU Méditerranée Infection, Marseille, France
| | - Andreas Stein
- Service de Maladies Infectieuses et tropicales, CHU de la Conception, IHU Méditerranée Infection, Marseille, France
| | - Jean-Christophe Lagier
- Aix-Marseille Université, CNRS 7278, IRD 198, Inserm 1095, AP-HM, URMITE, IHU Méditerranée Infection, Marseille, France
| | - Didier Raoult
- Aix-Marseille Université, CNRS 7278, IRD 198, Inserm 1095, AP-HM, URMITE, IHU Méditerranée Infection, Marseille, France
| | - Fadi Bittar
- Aix-Marseille Université, CNRS 7278, IRD 198, Inserm 1095, AP-HM, URMITE, IHU Méditerranée Infection, Marseille, France
- * E-mail:
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Hamad I, Ranque S, Azhar EI, Yasir M, Jiman-Fatani AA, Tissot-Dupont H, Raoult D, Bittar F. Culturomics and Amplicon-based Metagenomic Approaches for the Study of Fungal Population in Human Gut Microbiota. Sci Rep 2017; 7:16788. [PMID: 29196717 PMCID: PMC5711903 DOI: 10.1038/s41598-017-17132-4] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Accepted: 11/15/2017] [Indexed: 12/17/2022] Open
Abstract
Herein, the mycobiota was characterized in fecal samples from sick patients and healthy subjects, collected from different geographical locations and using both culturomics and amplicon-based metagenomics approaches. Using the culturomics approach, a total of 17,800 fungal colonies were isolated from 14 fecal samples, and resulted in the isolation of 41 fungal species, of which 10 species had not been previously reported in the human gut. Deep sequencing of fungal-directed ITS1 and ITS2 amplicons led to the detection of a total of 142 OTUs and 173 OTUs from the ITS1 and ITS2 regions, respectively. Ascomycota composed the largest fraction of the total OTUs analyzed (78.9% and 68.2% of the OTUs from the ITS1 and ITS2 regions, respectively), followed by Basidiomycota (16.9% and 30.1% of the OTUs from the ITS1 and ITS2 regions, respectively). Interestingly, the results demonstrate that the ITS1/ITS2 amplicon sequencing provides different information about gut fungal communities compared to culturomics, though both approaches complete each other in assessing fungal diversity in fecal samples. We also report higher fungal diversity and abundance in patients compared to healthy subjects. In conclusion, combining both culturomic and amplicon-based metagenomic approaches may be a novel strategy towards analyzing fungal compositions in the human gut.
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Affiliation(s)
- Ibrahim Hamad
- Aix Marseille University, CNRS 7278, IRD 198, Inserm 1095, AP-HM, URMITE, IHU Méditerranée Infection, Marseille, France
- Charmo University, Charmo Research Center, 46023, Chamchamal, Sulaimani, Iraq
| | - Stéphane Ranque
- Aix Marseille University, CNRS 7278, IRD 198, Inserm 1095, AP-HM, URMITE, IHU Méditerranée Infection, Marseille, France
| | - Esam I Azhar
- Special Infectious Agents Unit, King Fahd Medical Research Centre, King Abdulaziz University, Jeddah, Saudi Arabia
- Department of Medical Laboratory Technology, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Muhammad Yasir
- Special Infectious Agents Unit, King Fahd Medical Research Centre, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Asif A Jiman-Fatani
- Special Infectious Agents Unit, King Fahd Medical Research Centre, King Abdulaziz University, Jeddah, Saudi Arabia
- Department of Medical Microbiology and Parasitology, Faculty of Medicine, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Hervé Tissot-Dupont
- Aix Marseille University, CNRS 7278, IRD 198, Inserm 1095, AP-HM, URMITE, IHU Méditerranée Infection, Marseille, France
| | - Didier Raoult
- Aix Marseille University, CNRS 7278, IRD 198, Inserm 1095, AP-HM, URMITE, IHU Méditerranée Infection, Marseille, France
| | - Fadi Bittar
- Aix Marseille University, CNRS 7278, IRD 198, Inserm 1095, AP-HM, URMITE, IHU Méditerranée Infection, Marseille, France.
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Hamad I, Raoult D, Bittar F. Repertory of eukaryotes (eukaryome) in the human gastrointestinal tract: taxonomy and detection methods. Parasite Immunol 2016; 38:12-36. [PMID: 26434599 DOI: 10.1111/pim.12284] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Accepted: 09/23/2015] [Indexed: 12/22/2022]
Abstract
Eukaryotes are an important component of the human gut, and their relationship with the human host varies from parasitic to commensal. Understanding the diversity of human intestinal eukaryotes has important significance for human health. In the past few decades, most of the multitudes of techniques that are involved in the diagnosis of the eukaryotic population in the human intestinal tract were confined to pathological and parasitological aspects that mainly rely on traditionally based methods. However, development of culture-independent molecular techniques comprised of direct DNA extraction from faeces followed by sequencing, offer new opportunities to estimate the occurrence of eukaryotes in the human gut by providing data on the entire eukaryotic community, particularly not-yet-cultured or fastidious organisms. Further broad surveys of the eukaryotic communities in the gut based on high throughput tools such as next generation sequencing might lead to uncovering the real diversity of these ubiquitous organisms in the human intestinal tract and discovering the unrecognized roles of these eukaryotes in modulating the host immune system and inducing changes in host gut physiology and ecosystem.
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Affiliation(s)
- I Hamad
- URMITE, UM63, CNRS 7278, IRD 198, Inserm 1095, Aix Marseille Université, Marseille, France
| | - D Raoult
- URMITE, UM63, CNRS 7278, IRD 198, Inserm 1095, Aix Marseille Université, Marseille, France
| | - F Bittar
- URMITE, UM63, CNRS 7278, IRD 198, Inserm 1095, Aix Marseille Université, Marseille, France
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Hamad I, Forestier CL, Greub G, Jaton K, Raoult D, Bittar F. Reply to Bastien et al. J Infect Dis 2015; 212:506-8. [PMID: 25737561 DOI: 10.1093/infdis/jiv130] [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] [Received: 02/03/2015] [Accepted: 02/05/2015] [Indexed: 12/25/2022] Open
Affiliation(s)
- Ibrahim Hamad
- Aix Marseille Université, URMITE, UM63, CNRS 7278, IRD 198, Inserm 1095, France
| | | | - Gilbert Greub
- Institute of Microbiology, University of Lausanne and University Hospital Center, Switzerland
| | - Katia Jaton
- Institute of Microbiology, University of Lausanne and University Hospital Center, Switzerland
| | - Didier Raoult
- Aix Marseille Université, URMITE, UM63, CNRS 7278, IRD 198, Inserm 1095, France
| | - Fadi Bittar
- Aix Marseille Université, URMITE, UM63, CNRS 7278, IRD 198, Inserm 1095, France
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Abstract
Because of the close genetic relatedness between apes and humans, apes are susceptible to many human infectious agents and can serve as carriers of these pathogens. Consequently, they present a serious health hazard to humans. Moreover, many emerging infectious diseases originate in wildlife and continue to threaten human populations, especially vector-borne diseases described in great apes, such as malaria and rickettsiosis. These wild primates may be permanent reservoirs and important sources of human pathogens. In this special issue, we report that apes, including chimpanzees (Pan troglodytes), bonobos (Pan paniscus), gorillas (Gorilla gorilla and Gorilla beringei), orangutans (Pongo pygmaeus and Pongo abelii), gibbons (Hylobates spp., Hoolock spp. and Nomascus spp) and siamangs (Symphalangus syndactylus syndactylus and Symphalangus continentis), have many bacterial, viral, fungal and parasitic species that are capable of infecting humans. Serious measures should be adopted in tropical forests and sub-tropical areas where habitat overlaps are frequent to survey and prevent infectious diseases from spreading from apes to people.
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Affiliation(s)
- Mamadou B Keita
- Aix Marseille Université, URMITE, UM63, CNRS 7278, IRD 198, Inserm 1095, 13005 Marseille, France
| | - Ibrahim Hamad
- Aix Marseille Université, URMITE, UM63, CNRS 7278, IRD 198, Inserm 1095, 13005 Marseille, France
| | - Fadi Bittar
- Aix Marseille Université, URMITE, UM63, CNRS 7278, IRD 198, Inserm 1095, 13005 Marseille, France.
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Abstract
Vector-borne parasites of the genus Leishmania are responsible for severe human diseases. Cutaneous leishmaniasis, a common form of the disease, is most often caused by the transmission of Leishmania major to humans by female phlebotomine sand flies. Apes are increasingly being seen as a source of zoonotic diseases, including malaria and rickettsiosis. To examine whether gorillas harbor Leishmania species, we screened fecal samples from wild western lowland gorillas (Gorilla gorilla gorilla) in Cameroon for the presence of these pathogens. Of 91 wild gorilla fecal samples, 12 contained Leishmania parasites, and 4 contained phlebotomine sand fly vectors. The molecular identity was determined by running 3 different polymerase chain reaction tests for detection of L. major. Next, fluorescence in situ hybridization was performed to visualize L. major parasites in fecal samples from the gorillas. Both promastigote and amastigote forms of the parasite were found. This work strongly suggests that wild gorillas carry pathogenic Leishmania parasites.
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Affiliation(s)
- Ibrahim Hamad
- Aix Marseille Université, URMITE, UM63, CNRS 7278, IRD 198, Inserm 1095, Marseille
| | | | - Martine Peeters
- Institut de Recherche pour le Développement, University Montpellier 1, UMI 233, France
| | - Eric Delaporte
- Institut de Recherche pour le Développement, University Montpellier 1, UMI 233, France
| | - Didier Raoult
- Aix Marseille Université, URMITE, UM63, CNRS 7278, IRD 198, Inserm 1095, Marseille
| | - Fadi Bittar
- Aix Marseille Université, URMITE, UM63, CNRS 7278, IRD 198, Inserm 1095, Marseille
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Hamad I, Delaporte E, Raoult D, Bittar F. Detection of termites and other insects consumed by African great apes using molecular fecal analysis. Sci Rep 2014; 4:4478. [PMID: 24675424 PMCID: PMC3967517 DOI: 10.1038/srep04478] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2013] [Accepted: 03/11/2014] [Indexed: 12/24/2022] Open
Abstract
The consumption of insects by apes has previously been reported based on direct observations and/or trail signs in feces. However, DNA-based diet analyses may have the potential to reveal trophic links for these wild species. Herein, we analyzed the insect-diet diversity of 9 feces obtained from three species of African great apes, gorilla (Gorilla gorilla gorilla), chimpanzee (Pan troglodytes) and bonobo (Pan paniscus), using two mitochondrial amplifications for arthropods. A total of 1056 clones were sequenced for Cyt-b and COI gene libraries, which contained 50 and 56 operational taxonomic units (OTUs), respectively. BLAST research revealed that the OTUs belonged to 32 families from 5 orders (Diptera, Isoptera, Lepidoptera, Coleoptera, and Orthoptera). While ants were not detected by this method, the consumption of flies, beetles, moths, mosquitoes and termites was evident in these samples. Our findings indicate that molecular techniques can be used to analyze insect food items in wild animals.
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Affiliation(s)
- Ibrahim Hamad
- Aix-Marseille Université, URMITE, UM63, CNRS 7278, IRD 198, Inserm 1095, 13005 Marseille, France
| | - Eric Delaporte
- Institut de Recherche pour le Développement, University Montpellier 1, UMI 233, Montpellier, France
| | - Didier Raoult
- Aix-Marseille Université, URMITE, UM63, CNRS 7278, IRD 198, Inserm 1095, 13005 Marseille, France
| | - Fadi Bittar
- Aix-Marseille Université, URMITE, UM63, CNRS 7278, IRD 198, Inserm 1095, 13005 Marseille, France
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Dubourg G, Lagier JC, Armougom F, Robert C, Hamad I, Brouqui P, Raoult D. The gut microbiota of a patient with resistant tuberculosis is more comprehensively studied by culturomics than by metagenomics. Eur J Clin Microbiol Infect Dis 2013; 32:637-45. [PMID: 23291779 DOI: 10.1007/s10096-012-1787-3] [Citation(s) in RCA: 110] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2012] [Accepted: 11/18/2012] [Indexed: 01/19/2023]
Abstract
Gut microbiota consists of 10(10) bacteria per gram of stool. Many antibiotic regimens induce a reduction in both the diversity and the abundance of the gut flora. We analyzed one stool sample collected from a patient treated for drug-resistant Mycobacterium tuberculosis and who ultimately died from pneumonia due to a Streptococcus pneumoniae 10 months later. We performed microscopic observation, used 70 culture conditions (microbial culturomics) with identification by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF) and 16S rRNA amplification and sequencing, pyrosequencing, and 18S rRNA amplification and clone sequencing. Electron and optical microscopic observations revealed the presence of yeast, but no bacterial species were observed. By culture, only 39 bacterial species were identified, including one new species, as well as three species that have not been previously observed in the human gut. The pyrosequencing showed only 18 phylotypes, detecting a lower number of bacterial species than the culture techniques. Only two phylotypes overlapped with culturomics. In contrast, an amount of chloroplasts was found. Additionally, specific molecular eukaryote detection found three fungal species. We recovered, for the first time, more cultivable than non-cultivable bacterial species in a patient with a low bacterial load in the gut, demonstrating the depth bias of pyrosequencing. We propose that the desertification of gut microbiota in this patient is a reflection of the total body microbiota and may have contributed to the invasive infection of S. pneumoniae. This finding suggests that caution should be applied when treating patients with broad-spectrum antibiotics, and preventive measures should be taken in order to avoid invasive infection.
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Affiliation(s)
- G Dubourg
- Aix Marseille Université, URMITE, UM63, CNRS 7278, IRD 198, INSERM 1095, 13005 Marseille, France
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Khdair A, Hamad I, Al-Hussaini M, Albayati D, Alkhatib H, Alkhalidi B. In Vitro Artificial Membrane-Natural Mucosa Correlation of Carvedilol Buccal Delivery. J Drug Deliv Sci Technol 2013. [DOI: 10.1016/s1773-2247(13)50092-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Abstract
BACKGROUND Microbial eukaryotes represent an important component of the human gut microbiome, with different beneficial or harmful roles; some species are commensal or mutualistic, whereas others are opportunistic or parasitic. The diversity of eukaryotes inhabiting humans remains relatively unexplored because of either the low abundance of these organisms in human gut or because they have received limited attention from a whole-community perspective. METHODOLOGY/PRINCIPAL FINDING In this study, a single fecal sample from a healthy African male was studied using both culture-dependent methods and extended molecular methods targeting the 18S rRNA and ITS sequences. Our results revealed that very few fungi, including Candida spp., Galactomyces spp., and Trichosporon asahii, could be isolated using culture-based methods. In contrast, a relatively a high number of eukaryotic species could be identified in this fecal sample when culture-independent methods based on various primer sets were used. A total of 27 species from one sample were found among the 977 analyzed clones. The clone libraries were dominated by fungi (716 clones/977, 73.3%), corresponding to 16 different species. In addition, 187 sequences out of 977 (19.2%) corresponded to 9 different species of plants; 59 sequences (6%) belonged to other micro-eukaryotes in the gut, including Entamoeba hartmanni and Blastocystis sp; and only 15 clones/977 (1.5%) were related to human 18S rRNA sequences. CONCLUSION Our results revealed a complex eukaryotic community in the volunteer's gut, with fungi being the most abundant species in the stool sample. Larger investigations are needed to assess the generality of these results and to understand their roles in human health and disease.
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Affiliation(s)
- Ibrahim Hamad
- URMITE UMR-IRD 198, IHU Méditerranée Infection, Aix-Marseille Université, Marseille, France
| | | | - Didier Raoult
- URMITE UMR-IRD 198, IHU Méditerranée Infection, Aix-Marseille Université, Marseille, France
| | - Fadi Bittar
- URMITE UMR-IRD 198, IHU Méditerranée Infection, Aix-Marseille Université, Marseille, France
- * E-mail:
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Hamad I, Hunter A, Szebeni J, Moghimi S. Poly(ethylene glycol)s generate complement activation products in human serum through increased alternative pathway turnover and a MASP-2-dependent process. Mol Immunol 2008; 46:225-32. [DOI: 10.1016/j.molimm.2008.08.276] [Citation(s) in RCA: 162] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2008] [Revised: 08/26/2008] [Accepted: 08/27/2008] [Indexed: 10/21/2022]
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Jain A, Kashyap R, Dodson F, Kramer D, Hamad I, Khan A, Eghestad B, Starzl T, Fung J. A prospective randomized trial of tacrolimus and prednisone versus tacrolimus, prednisone and mycophenolate mofetil in primary adult liver transplantation: a single center report. Transplantation 2001; 72:1091-7. [PMID: 11579306 PMCID: PMC2952491 DOI: 10.1097/00007890-200109270-00019] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
BACKGROUND Tacrolimus (TAC) and mycophenolate mofetil (MMF) are currently approved immunosuppressants for prevention of rejection in liver transplantation (LTx). They have different modes of action and toxicity profiles, but the efficacy and safety of MMF in primary liver transplantation with TAC has not been determined. METHODS An Institutional Review Board-approved, open-label, single-center, prospective randomized trial was initiated to study the efficacy and toxicity of TAC and steroids (double-drug therapy (D)) versus TAC, steroids, and MMF (triple-drug therapy (T)) in primary adult LTx recipients. Both groups of patients were started on the same doses of TAC and steroids. Patients randomized to T also received 1 gm MMF twice a day. RESULTS Between August 1995 and May 1998, 350 patients were enrolled at a single center-175 in the D and 175 in the T groups. All patients were followed until May 1998, with a mean follow-up of 33.8+/-9.1 months. Using an intention-to-treat analysis, the 1-, 2-, 3-, and 4-year patient survival was 85.1%, 81.6%, 78.6%, and 75.8%, respectively, for D and 87.4%, 85.4%, 81.3%, and 79.9%, respectively, for T. The 4-year graft survival was 70% for D and 72.1% for T. Although the rate of acute rejection in the first 3 months was significantly lower for T than for D (28% for triple vs. 38.9% for double, P=0.03), the overall rate of rejection for T at the end of 1 year was not significantly lower than for the D (38.9% triple vs. 45.2% double). The median time to the first episode of rejection was 14 days for D versus 24 days for T (P=0.008). During the study period, 38 of 175 patients in D received MMF to control ongoing acute rejection, nephrotoxicity, and/or neurotoxicity. On the other hand, 103 patients in the T discontinued MMF for infection, myelosuppression, and/or gastrointestinal disturbances. The need for corticosteroids was less after 6 months for T and the perioperative need for dialysis was lower with use of MMF. CONCLUSION This final report confirms similar patient survival and graft survival up to 4 years with a trend towards fewer episodes of rejection, lower need for steroids, and better perioperative renal function. However, the complex nature of LTx patients and their posttransplantation course prevents the routine application of MMF.
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Affiliation(s)
- A. Jain
- The Thomas E. Starzl Transplantation Institute, University of Pittsburgh, Pittsburgh, Pennsylvania
- Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - R. Kashyap
- The Thomas E. Starzl Transplantation Institute, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - F. Dodson
- The Thomas E. Starzl Transplantation Institute, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - D. Kramer
- Departments of Surgery and Anesthesiology/Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - I. Hamad
- The Thomas E. Starzl Transplantation Institute, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - A. Khan
- The Thomas E. Starzl Transplantation Institute, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - B. Eghestad
- The Thomas E. Starzl Transplantation Institute, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - T.E. Starzl
- The Thomas E. Starzl Transplantation Institute, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - J.J. Fung
- The Thomas E. Starzl Transplantation Institute, University of Pittsburgh, Pittsburgh, Pennsylvania
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Jain A, Kashyap R, Kramer D, Dodson F, Hamad I, Starzl TE, Fung JJ. Prospective randomized trial of tacrolimus and prednisone versus tacrolimus, prednisone, and mycophenolate mofetil: complete report on 350 primary adult liver transplantations. Transplant Proc 2001; 33:1342-4. [PMID: 11267319 PMCID: PMC3184833 DOI: 10.1016/s0041-1345(00)02502-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- A Jain
- Thomas E. Starzl Transplantation Institute, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA
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Abstract
BACKGROUND Neurological complications after orthotopic liver transplantation (OLTX) have remained a major concern in a small proportion of patients. The etiology of these complications is often thought to be multifactorial: the influence of calcineurin inhibitors is occasionally thought to play an important role. When neurotoxicity occurs after OLTX under tacrolimus, it is usually a minor complication and responds readily to a reduction in the dosage of or a temporary withdrawal of tacrolimus. However, neurotoxic complications occasionally do not respond to this conventional process. Neoral is a microemulsion formulation of cyclosporine. It has more consistent pharmacokinetic parameters and improved bioavailability when compared with conventional cyclosporine. The aim of the present report was to evaluate the role of Neoral in OLTX recipients with neurotoxic complication who failed to respond to a reduction in the dosage of tacrolimus. METHOD Between August 1995 and November 1997, 330 adults (age >18 years) received primary OLTX under tacrolimus-based immunosuppression (mean age 52.6+/-11.4 years). There were 190 men and 140 women. Twenty-three (7%) patients (mean age 53.2+/-11.8 years; 17 men, 6 women) were converted to Neoral (mean 35+/-41 days after OLTX). These patients were followed until June 1998 (mean follow-up 22.7+/-7.8 months). RESULTS Four (17.4%) patients died during the follow-up period, and two patients underwent retransplantation. Neurological symptoms improved in all patients who survived. Adequate trough concentrations were achieved in all patients with p.o. Neoral. Nine (39%) patients experienced rejection episodes after conversion. Six (26.1%) patients were converted back to tacrolimus because of ongoing rejection (n=3), retransplantation (n=2), or persistent nausea and vomiting (n=1) without recurrence of the original neurological complication. CONCLUSION Neurological complications after OLTX disorders that occur under tacrolimus and that fail to respond to a reduction in the dosage can be treated safely by conversion to Neoral. However, the rate of rejection is up to 39%, and patients can often be converted back to tacrolimus without recurrence of the original neurological complication.
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Affiliation(s)
- A Jain
- Thomas E. Starzl Transplantation Institute, Department of Surgery, University of Pittsburgh Medical Center, Pennsylvania 15213, USA
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37
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Jain AB, Hamad I, Zuckerman S, Zhang S, Warty VS, Fung JJ, Venkataramanan R. Effect of t-tube clamping on the pharmacokinetics of mycophenolic acid in liver transplant patients on oral therapy of mycophenolate mofetil. Liver Transpl Surg 1999; 5:101-6. [PMID: 10071348 DOI: 10.1002/lt.500050207] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The aim of the study was to evaluate the effect of t-tube clamping on the pharmacokinetics of mycophenolic acid (MPA) after oral administration of mycophenolate mofetil (MMF) in primary liver transplant recipients treated with tacrolimus as the primary immunosuppressive drug. We evaluated the pharmacokinetics of MPA and its primary metabolite, mycophenolic acid glucuronide (MPAG), before and after clamping the t-tube in 8 primary liver transplant recipients treated with oral MMF and tacrolimus. The concentration of MPA and MPAG in plasma, bile, and urine samples obtained over one dosing interval was measured by high-pressure liquid chromatography. Pharmacokinetic parameters of MPA estimated before and after clamping the t-tube were compared to evaluate any significant differences at a P of.05 or less. There were no significant differences in the time to reach peak plasma concentration (1.8 +/- 1.7 v 1.0 +/- 0.5 hours), trough plasma concentration of MPA (1.1 +/- 1.4 v 1.4 +/- 1.1 microgram/mL), peak plasma concentration of MPA (10.6 +/- 7.5 v 11.1 +/- 4.6 microgram/mL), area under the plasma concentration-versus-time curve (AUC) (40.1 +/- 31.9 v 43.2 +/- 21.1 microgram/mL/h) of MPA, or the percentage of MPA that is free or unbound in the plasma (3.9% +/- 1.6% v 4.1% +/- 3.0%). There was also no significant difference in the ratio of the AUC of MPAG to MPA. These observations suggest that t-tube clamping does not affect the kinetics of MPA or MPAG and that no dosing alterations of MMF are required when the t-tube is clamped in liver transplant recipients.
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Affiliation(s)
- A B Jain
- Thomas E. Starzl Transplantation Institute, School of Medicine, The University of Pittsburgh, Pittsburgh, PA, USA
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38
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Jain AB, Hamad I, Rakela J, Dodson F, Kramer D, Demetris J, McMichael J, Starzl TE, Fung JJ. A prospective randomized trial of tacrolimus and prednisone versus tacrolimus, prednisone, and mycophenolate mofetil in primary adult liver transplant recipients: an interim report. Transplantation 1998; 66:1395-8. [PMID: 9846530 PMCID: PMC2952474 DOI: 10.1097/00007890-199811270-00024] [Citation(s) in RCA: 71] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND Tacrolimus (Tac) and mycophenolate mofetil (MMF) are newly approved immunosuppressive agents. However, the safety and efficacy of the combination of MMF and Tac in primary liver transplantation has not been determined. METHODS An Institutional Review Board-approved, open-label prospective randomized protocol was initiated to study the efficacy and toxicity of Tac and steroids (double-drug therapy) versus Tac, steroids, and MMF (triple-drug therapy) in primary adult liver transplant recipients. Both groups of patients began on the same doses of Tac and steroids. Patients randomized to triple-drug therapy also received 1 g of MMF twice a day. RESULTS Between August 1995 and January 1997, 200 patients were enrolled, 99 in double-drug therapy and 101 in triple-drug therapy. All patients were followed until May 1997, with a mean follow-up of 12.7 months. During the study period, 28 of 99 patients in double-drug therapy received MMF to control ongoing acute rejection, nephrotoxicity, and/or neurotoxicity. On the other hand, 61 patients in triple-drug therapy discontinued MMF for infection, myelosuppression, and/or gastrointestinal disturbances. By an "intention-to-treat analysis," the actuarial 1-year patient survival rate was 85.1% in double-drug therapy and 83.1% in triple-drug therapy (P=0.77). The actuarial 1-year graft survival rate was 80.2% for double-drug therapy and 79.2% for triple-drug therapy (P=0.77). Forty-one patients (41.4%) in double-drug therapy and 32 (31.7%) in triple-drug therapy had at least one episode of rejection, but this was not statistically significant (P=0.15). The mean maintenance dose of corticosteroids was slightly lower in triple-drug compared with double-drug therapy. CONCLUSION Patient and graft survival rates were similar in both groups. There was a trend to a lower incidence of rejection, reduced nephrotoxicity, and a lesser amount of maintenance corticosteroids in triple-drug therapy compared with double-drug therapy.
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Affiliation(s)
- A B Jain
- The Thomas E. Starzl Transplantation Institute and the Division of Transplantation Surgery, University of Pittsburgh, Pennsylvania 15213, USA
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