51
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An H, Qian C, Huang Y, Li J, Tian X, Feng J, Hu J, Fang Y, Jiao F, Zeng Y, Huang X, Meng X, Liu X, Lin X, Zeng Z, Guilliams M, Beschin A, Chen Y, Wu Y, Wang J, Oggioni MR, Leong J, Veening JW, Deng H, Zhang R, Wang H, Wu J, Cui Y, Zhang JR. Functional vulnerability of liver macrophages to capsules defines virulence of blood-borne bacteria. J Exp Med 2022; 219:213054. [PMID: 35258552 PMCID: PMC8908791 DOI: 10.1084/jem.20212032] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 12/22/2021] [Accepted: 01/24/2022] [Indexed: 12/12/2022] Open
Abstract
Many encapsulated bacteria use capsules to cause invasive diseases. However, it remains largely unknown how the capsules enhance bacterial virulence under in vivo infection conditions. Here we show that the capsules primarily target the liver to enhance bacterial survival at the onset of blood-borne infections. In a mouse sepsis model, the capsules enabled human pathogens Streptococcus pneumoniae and Escherichia coli to circumvent the recognition of liver-resident macrophage Kupffer cells (KCs) in a capsular serotype-dependent manner. In contrast to effective capture of acapsular bacteria by KCs, the encapsulated bacteria are partially (low-virulence types) or completely (high-virulence types) “untouchable” for KCs. We finally identified the asialoglycoprotein receptor (ASGR) as the first known capsule receptor on KCs to recognize the low-virulence serotype-7F and -14 pneumococcal capsules. Our data identify the molecular interplay between the capsules and KCs as a master controller of the fate and virulence of encapsulated bacteria, and suggest that the interplay is targetable for therapeutic control of septic infections.
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Affiliation(s)
- Haoran An
- Center for Infectious Disease Research, Department of Basic Medical Science, School of Medicine, Tsinghua University, Beijing, China.,Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing, China
| | - Chenyun Qian
- Center for Infectious Disease Research, Department of Basic Medical Science, School of Medicine, Tsinghua University, Beijing, China.,Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing, China
| | - Yijia Huang
- Center for Infectious Disease Research, Department of Basic Medical Science, School of Medicine, Tsinghua University, Beijing, China
| | - Jing Li
- Center for Infectious Disease Research, Department of Basic Medical Science, School of Medicine, Tsinghua University, Beijing, China
| | - Xianbin Tian
- Center for Infectious Disease Research, Department of Basic Medical Science, School of Medicine, Tsinghua University, Beijing, China
| | - Jiaying Feng
- Center for Infectious Disease Research, Department of Basic Medical Science, School of Medicine, Tsinghua University, Beijing, China
| | - Jiao Hu
- Center for Infectious Disease Research, Department of Basic Medical Science, School of Medicine, Tsinghua University, Beijing, China
| | - Yujie Fang
- Center for Infectious Disease Research, Department of Basic Medical Science, School of Medicine, Tsinghua University, Beijing, China
| | - Fangfang Jiao
- Center for Infectious Disease Research, Department of Basic Medical Science, School of Medicine, Tsinghua University, Beijing, China
| | - Yuna Zeng
- Center for Infectious Disease Research, Department of Basic Medical Science, School of Medicine, Tsinghua University, Beijing, China
| | - Xueting Huang
- Center for Infectious Disease Research, Department of Basic Medical Science, School of Medicine, Tsinghua University, Beijing, China.,Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing, China
| | - Xianbin Meng
- School of Life Sciences, Tsinghua University, Beijing, China
| | - Xue Liu
- Department of Fundamental Microbiology, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland
| | - Xin Lin
- Center for Infectious Disease Research, Department of Basic Medical Science, School of Medicine, Tsinghua University, Beijing, China.,Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing, China
| | - Zhutian Zeng
- School of Life Sciences, University of Science and Technology of China, Hefei, China
| | - Martin Guilliams
- Laboratory of Myeloid Cell Biology in Tissue Homeostasis and Regeneration, VIB Center for Inflammation Research, Ghent, Belgium.,Department of Biomedical Molecular Biology, Faculty of Science, Ghent University, Ghent, Belgium
| | - Alain Beschin
- Myeloid Cell Immunology Lab, VIB Center for Inflammation Research, Brussels, Belgium.,Laboratory of Cellular and Molecular Immunology, Vrije University Brussel, Brussels, Belgium
| | - Yongwen Chen
- Institute of Immunology, Third Military Medical University, Chongqing, China
| | - Yuzhang Wu
- Institute of Immunology, Third Military Medical University, Chongqing, China
| | - Jing Wang
- Shanghai Institute of Immunology, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | | | - John Leong
- Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, MA
| | - Jan-Willem Veening
- Department of Fundamental Microbiology, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland
| | - Haiteng Deng
- School of Life Sciences, Tsinghua University, Beijing, China
| | - Rong Zhang
- The Second Affiliated Hospital of Zhejiang University, Zhejiang University, Hangzhou, China
| | - Hui Wang
- Department of Clinical Laboratory, Peking University People's Hospital, Beijing, China
| | - Jiang Wu
- Beijing Center for Disease Control and Prevention, Beijing, China
| | - Yan Cui
- Department of General Surgery, Strategic Support Force Medical Center, Beijing, China
| | - Jing-Ren Zhang
- Center for Infectious Disease Research, Department of Basic Medical Science, School of Medicine, Tsinghua University, Beijing, China.,Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing, China
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52
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Bendas G, Schlesinger M. The GPIb-IX complex on platelets: insight into its novel physiological functions affecting immune surveillance, hepatic thrombopoietin generation, platelet clearance and its relevance for cancer development and metastasis. Exp Hematol Oncol 2022; 11:19. [PMID: 35366951 PMCID: PMC8976409 DOI: 10.1186/s40164-022-00273-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Accepted: 03/19/2022] [Indexed: 12/13/2022] Open
Abstract
The glycoprotein (GP) Ib-IX complex is a platelet receptor that mediates the initial interaction with subendothelial von Willebrand factor (VWF) causing platelet arrest at sites of vascular injury even under conditions of high shear. GPIb-IX dysfunction or deficiency is the reason for the rare but severe Bernard-Soulier syndrome (BSS), a congenital bleeding disorder. Although knowledge on GPIb-IX structure, its basic functions, ligands, and intracellular signaling cascades have been well established, several advances in GPIb-IX biology have been made in the recent years. Thus, two mechanosensitive domains and a trigger sequence in GPIb were characterized and its role as a thrombin receptor was deciphered. Furthermore, it became clear that GPIb-IX is involved in the regulation of platelet production, clearance and thrombopoietin secretion. GPIb is deemed to contribute to liver cancer development and metastasis. This review recapitulates these novel findings highlighting GPIb-IX in its multiple functions as a key for immune regulation, host defense, and liver cancer development.
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Affiliation(s)
- Gerd Bendas
- Department of Pharmacy, Rheinische Friedrich-Wilhelms-University Bonn, An der Immenburg 4, 53121, Bonn, Germany
| | - Martin Schlesinger
- Department of Pharmacy, Rheinische Friedrich-Wilhelms-University Bonn, An der Immenburg 4, 53121, Bonn, Germany. .,Federal Institute for Drugs and Medical Devices (BfArM), Bonn, Germany.
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53
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Mandel J, Casari M, Stepanyan M, Martyanov A, Deppermann C. Beyond Hemostasis: Platelet Innate Immune Interactions and Thromboinflammation. Int J Mol Sci 2022; 23:ijms23073868. [PMID: 35409226 PMCID: PMC8998935 DOI: 10.3390/ijms23073868] [Citation(s) in RCA: 52] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 03/29/2022] [Accepted: 03/29/2022] [Indexed: 02/07/2023] Open
Abstract
There is accumulating evidence that platelets play roles beyond their traditional functions in thrombosis and hemostasis, e.g., in inflammatory processes, infection and cancer, and that they interact, stimulate and regulate cells of the innate immune system such as neutrophils, monocytes and macrophages. In this review, we will focus on platelet activation in hemostatic and inflammatory processes, as well as platelet interactions with neutrophils and monocytes/macrophages. We take a closer look at the contributions of major platelet receptors GPIb, αIIbβ3, TLT-1, CLEC-2 and Toll-like receptors (TLRs) as well as secretions from platelet granules on platelet-neutrophil aggregate and neutrophil extracellular trap (NET) formation in atherosclerosis, transfusion-related acute lung injury (TRALI) and COVID-19. Further, we will address platelet-monocyte and macrophage interactions during cancer metastasis, infection, sepsis and platelet clearance.
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Affiliation(s)
- Jonathan Mandel
- Center for Thrombosis and Hemostasis, University Medical Center of the Johannes Gutenberg-University, 55131 Mainz, Germany; (J.M.); (M.C.); (M.S.)
| | - Martina Casari
- Center for Thrombosis and Hemostasis, University Medical Center of the Johannes Gutenberg-University, 55131 Mainz, Germany; (J.M.); (M.C.); (M.S.)
| | - Maria Stepanyan
- Center for Thrombosis and Hemostasis, University Medical Center of the Johannes Gutenberg-University, 55131 Mainz, Germany; (J.M.); (M.C.); (M.S.)
- Center For Theoretical Problems of Physico-Chemical Pharmacology, 109029 Moscow, Russia;
- Physics Faculty, Lomonosov Moscow State University, 119991 Moscow, Russia
- Dmitriy Rogachev National Medical Research Center of Pediatric Hematology, Oncology Immunology Ministry of Healthcare of Russian Federation, 117198 Moscow, Russia
| | - Alexey Martyanov
- Center For Theoretical Problems of Physico-Chemical Pharmacology, 109029 Moscow, Russia;
- Dmitriy Rogachev National Medical Research Center of Pediatric Hematology, Oncology Immunology Ministry of Healthcare of Russian Federation, 117198 Moscow, Russia
- N.M. Emanuel Institute of Biochemical Physics RAS (IBCP RAS), 119334 Moscow, Russia
| | - Carsten Deppermann
- Center for Thrombosis and Hemostasis, University Medical Center of the Johannes Gutenberg-University, 55131 Mainz, Germany; (J.M.); (M.C.); (M.S.)
- Correspondence:
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54
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Jevtic SD, Nazy I. The COVID Complex: A Review of Platelet Activation and Immune Complexes in COVID-19. Front Immunol 2022; 13:807934. [PMID: 35371058 PMCID: PMC8965558 DOI: 10.3389/fimmu.2022.807934] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Accepted: 01/31/2022] [Indexed: 12/11/2022] Open
Abstract
Coronavirus disease 2019 (COVID-19) is a highly prothrombotic viral infection that primarily manifests as an acute respiratory syndrome. However, critically ill COVID-19 patients will often develop venous thromboembolism with associated increases in morbidity and mortality. The cause for this prothrombotic state is unclear but is likely related to platelet hyperactivation. In this review, we summarize the current evidence surrounding COVID-19 thrombosis and platelet hyperactivation. We highlight the fact that several studies have identified a soluble factor in COVID-19 patient plasma that is capable of altering platelet phenotype in vitro. Furthermore, this soluble factor appears to be an immune complex, which may be composed of COVID-19 Spike protein and related antibodies. We suggest that these Spike-specific immune complexes contribute to COVID-19 platelet activation and thrombosis in a manner similar to heparin-induced thrombocytopenia. Understanding this underlying pathobiology will be critical for advancement of future research and therapeutic options.
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Affiliation(s)
- Stefan D. Jevtic
- Department of Medicine, McMaster University Medical Centre, McMaster University, Hamilton, ON, Canada
| | - Ishac Nazy
- Department of Medicine, McMaster University Medical Centre, McMaster University, Hamilton, ON, Canada
- McMaster Centre for Transfusion Research, McMaster University, Hamilton, ON, Canada
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55
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Rabouël Y, Magnenat S, Lefebvre F, Delabranche X, Gachet C, Hechler B. Transfusion of fresh washed platelets does not prevent experimental polymicrobial-induced septic shock in mice. J Thromb Haemost 2022; 20:449-460. [PMID: 34752015 DOI: 10.1111/jth.15583] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Revised: 11/05/2021] [Accepted: 11/08/2021] [Indexed: 11/29/2022]
Abstract
INTRODUCTION The specific role of platelets during sepsis is not yet fully understood, probably related to the paradox of platelets being potentially beneficial but also deleterious via their thrombotic functions. OBJECTIVE To evaluate the impact of thrombocytopenia on septic shock in mice and to investigate whether transfusion of fresh washed platelets, either fully functional or with impaired hemostatic properties, might have beneficial effects. METHODS Septic shock was induced by cecal ligation and puncture (CLP). Experimental depletion of circulating platelets was induced with a rat anti-mouse GPIbα monoclonal antibody. Transfusion of either wild-type washed platelets, platelets treated with the antiplatelet drugs acetylsalicylic acid (ASA) and clopidogrel, or GPIIbIIIa-deficient washed platelets treated with ASA and clopidogrel was performed 4 h after CLP surgery. RESULTS Depletion of circulating platelets negatively affected septic shock, worsening systemic inflammation, coagulopathy, organ damage, and mortality, raising the question of whether a higher platelet count could be protective. Transfusion of fully functional platelets or platelets with combined treatment with ASA and clopidogrel, with or without additional GPIIbIIIa deficiency, afforded an immediate return of circulating platelet counts to their initial values before surgery. However, transfusion of each of the three types of platelets did not prevent arterial hypotension, inflammatory response, coagulopathy, and organ damage during septic shock. CONCLUSION Depletion of circulating platelets negatively affects septic shock, while transfusion of washed platelets has no significant beneficial effect in mice.
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Affiliation(s)
- Yannick Rabouël
- Université de Strasbourg, INSERM, Etablissement Français du Sang (EFS) Grand Est, BPPS UMR_S1255, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Strasbourg, France
| | - Stéphanie Magnenat
- Université de Strasbourg, INSERM, Etablissement Français du Sang (EFS) Grand Est, BPPS UMR_S1255, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Strasbourg, France
| | - Floryna Lefebvre
- Université de Strasbourg, INSERM, Etablissement Français du Sang (EFS) Grand Est, BPPS UMR_S1255, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Strasbourg, France
| | - Xavier Delabranche
- Hôpitaux Universitaires de Strasbourg, Anesthésie, Réanimation et Médecine périopératoire, Nouvel Hôpital Civil, Strasbourg, France
| | - Christian Gachet
- Université de Strasbourg, INSERM, Etablissement Français du Sang (EFS) Grand Est, BPPS UMR_S1255, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Strasbourg, France
| | - Beatrice Hechler
- Université de Strasbourg, INSERM, Etablissement Français du Sang (EFS) Grand Est, BPPS UMR_S1255, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Strasbourg, France
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56
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O’Reilly D, Murphy CA, Drew R, El-Khuffash A, Maguire PB, Ainle FN, Mc Callion N. Platelets in pediatric and neonatal sepsis: novel mediators of the inflammatory cascade. Pediatr Res 2022; 91:359-367. [PMID: 34711945 PMCID: PMC8816726 DOI: 10.1038/s41390-021-01715-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 07/14/2021] [Accepted: 08/16/2021] [Indexed: 02/07/2023]
Abstract
Sepsis, a dysregulated host response to infection, has been difficult to accurately define in children. Despite a higher incidence, especially in neonates, a non-specific clinical presentation alongside a lack of verified biomarkers has prevented a common understanding of this condition. Platelets, traditionally regarded as mediators of haemostasis and thrombosis, are increasingly associated with functions in the immune system with involvement across the spectrum of innate and adaptive immunity. The large number of circulating platelets (approx. 150,000 cells per microlitre) mean they outnumber traditional immune cells and are often the first to encounter a pathogen at a site of injury. There are also well-described physiological differences between platelets in children and adults. The purpose of this review is to place into context the platelet and its role in immunology and examine the evidence where available for its role as an immune cell in childhood sepsis. It will examine how the platelet interacts with both humoral and cellular components of the immune system and finally discuss the role the platelet proteome, releasate and extracellular vesicles may play in childhood sepsis. This review also examines how platelet transfusions may interfere with the complex relationships between immune cells in infection. IMPACT: Platelets are increasingly being recognised as important "first responders" to immune threats. Differences in adult and paediatric platelets may contribute to differing immune response to infections. Adult platelet transfusions may affect infant immune responses to inflammatory/infectious stimuli.
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Affiliation(s)
- Daniel O’Reilly
- grid.416068.d0000 0004 0617 7587Department of Neonatology, Rotunda Hospital, Dublin, Ireland ,grid.7886.10000 0001 0768 2743Conway-SPHERE Research Group, Conway Institute, University College Dublin, Dublin, Ireland
| | - Claire A. Murphy
- grid.416068.d0000 0004 0617 7587Department of Neonatology, Rotunda Hospital, Dublin, Ireland ,grid.7886.10000 0001 0768 2743Conway-SPHERE Research Group, Conway Institute, University College Dublin, Dublin, Ireland ,grid.4912.e0000 0004 0488 7120Department of Paediatrics, Royal College of Surgeons in Ireland, Dubin, Ireland
| | - Richard Drew
- grid.416068.d0000 0004 0617 7587Clinical Innovation Unit, Rotunda Hospital, Dublin, Ireland ,Irish Meningitis and Sepsis Reference Laboratory, Children’s Health Ireland at Temple Street, Dublin, Ireland ,grid.4912.e0000 0004 0488 7120Department of Clinical Microbiology, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Afif El-Khuffash
- grid.416068.d0000 0004 0617 7587Department of Neonatology, Rotunda Hospital, Dublin, Ireland ,grid.4912.e0000 0004 0488 7120Department of Paediatrics, Royal College of Surgeons in Ireland, Dubin, Ireland
| | - Patricia B. Maguire
- grid.7886.10000 0001 0768 2743Conway-SPHERE Research Group, Conway Institute, University College Dublin, Dublin, Ireland ,grid.7886.10000 0001 0768 2743School of Biomolecular & Biomedical Science, University College Dublin, Dublin, Ireland
| | - Fionnuala Ni Ainle
- grid.7886.10000 0001 0768 2743Conway-SPHERE Research Group, Conway Institute, University College Dublin, Dublin, Ireland ,grid.7886.10000 0001 0768 2743School of Biomolecular & Biomedical Science, University College Dublin, Dublin, Ireland ,grid.411596.e0000 0004 0488 8430Department of Haematology, Mater Misericordiae University Hospital, Dublin, Ireland ,grid.416068.d0000 0004 0617 7587Department of Haematology, Rotunda Hospital, Dublin, Ireland ,grid.7886.10000 0001 0768 2743School of Medicine, University College Dublin, Dublin, Ireland
| | - Naomi Mc Callion
- grid.416068.d0000 0004 0617 7587Department of Neonatology, Rotunda Hospital, Dublin, Ireland ,grid.4912.e0000 0004 0488 7120Department of Paediatrics, Royal College of Surgeons in Ireland, Dubin, Ireland
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57
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Kitching AR, Hickey MJ. Immune cell behaviour and dynamics in the kidney - insights from in vivo imaging. Nat Rev Nephrol 2022; 18:22-37. [PMID: 34556836 DOI: 10.1038/s41581-021-00481-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/11/2021] [Indexed: 02/08/2023]
Abstract
The actions of immune cells within the kidney are of fundamental importance in kidney homeostasis and disease. In disease settings such as acute kidney injury, anti-neutrophil cytoplasmic antibody-associated vasculitis, lupus nephritis and renal transplant rejection, immune cells resident within the kidney and those recruited from the circulation propagate inflammatory responses with deleterious effects on the kidney. As in most forms of inflammation, intravital imaging - particularly two-photon microscopy - has been critical to our understanding of immune cell responses in the renal microvasculature and interstitium, enabling visualization of immune cell dynamics over time rather than statically. These studies have demonstrated differences in the recruitment and function of these cells from those in more conventional vascular beds, and provided a wealth of information on the actions of blood-borne immune cells such as neutrophils, monocytes and T cells, as well as kidney-resident mononuclear phagocytes, in a range of diseases affecting different kidney compartments. In particular, in vivo imaging has furthered our understanding of leukocyte function within the glomerulus in acute glomerulonephritis, and in the tubulointerstitium and interstitial microvasculature during acute kidney injury and following transplantation, revealing mechanisms of immune surveillance, antigen presentation and inflammation in the kidney.
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Affiliation(s)
- A Richard Kitching
- Centre for Inflammatory Diseases, Monash University Department of Medicine, Monash Medical Centre, Clayton, Victoria, Australia. .,Departments of Nephrology and Paediatric Nephrology, Monash Medical Centre, Clayton, Victoria, Australia.
| | - Michael J Hickey
- Centre for Inflammatory Diseases, Monash University Department of Medicine, Monash Medical Centre, Clayton, Victoria, Australia
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58
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Platelets in COVID-19 disease: friend, foe, or both? Pharmacol Rep 2022; 74:1182-1197. [PMID: 36463349 PMCID: PMC9726679 DOI: 10.1007/s43440-022-00438-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Revised: 11/16/2022] [Accepted: 11/17/2022] [Indexed: 12/07/2022]
Abstract
Immuno-thrombosis of COVID-19 results in the activation of platelets and coagulopathy. Antiplatelet therapy has been widely used in COVID-19 patients to prevent thrombotic events. However, recent analysis of clinical trials does not support the major effects of antiplatelet therapy on mortality in hospitalized COVID-19 patients, despite the indisputable evidence for an increased risk of thrombotic complications in COVID-19 disease. This apparent paradox calls for an explanation. Platelets have an important role in sensing and orchestrating host response to infection, and several platelet functions related to host defense response not directly related to their well-known hemostatic function are emerging. In this paper, we aim to review the evidence supporting the notion that platelets have protective properties in maintaining endothelial barrier integrity in the course of an inflammatory response, and this role seems to be of particular importance in the lung. It might, thus, well be that the inhibition of platelet function, if affecting the protective aspect of platelet activity, might diminish clinical benefits resulting from the inhibition of the pro-thrombotic phenotype of platelets in immuno-thrombosis of COVID-19. A better understanding of the platelet-dependent mechanisms involved in the preservation of the endothelial barrier is necessary to design the antiplatelet therapeutic strategies that inhibit the pro-thrombotic activity of platelets without effects on the vaso-protective function of platelets safeguarding the pulmonary endothelial barrier during multicellular host defense in pulmonary circulation.
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59
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Zheng L, Duan Z, Tang D, He Y, Chen X, Chen Q, Li M. GP IIb/IIIa-Mediated Platelet Activation and Its Modulation of the Immune Response of Monocytes Against Candida albicans. Front Cell Infect Microbiol 2021; 11:783085. [PMID: 34938671 PMCID: PMC8685400 DOI: 10.3389/fcimb.2021.783085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2021] [Accepted: 11/22/2021] [Indexed: 11/13/2022] Open
Abstract
Candida albicans is the most common fungal pathogen in humans, causing invasive disease and even potentially life-threatening systemic infections when tissue homeostasis is disrupted. Previous studies have identified an essential role of platelets in infection and immunity, especially when they are activated. However, it is still unclear whether platelets can be activated by C. albicans, and even less is known about the role of platelets in C. albicans infection. Herein, we showed that C. albicans induced platelet activation in vitro. C. albicans elevated the levels of AKT Ser473 phosphorylation, and inhibition of the PI3K-AKT signaling pathway reversed C. albicans-induced platelet activation. Surprisingly, C. albicans-induced platelet activation occurred in an integrin glycoprotein (GP) IIb/IIIa-dependent manner but was independent of the pattern recognition receptors toll-like receptor (TLR) 2 and TLR4. Interestingly, platelets enhanced the phagocytosis of human monocytes challenged with C. albicans and upregulated the expression of inflammatory cytokines, which were dependent on platelet activation mediated by GP IIb/IIIa. The present work provides new insights into the role of activated platelets in the defense against C. albicans, highlighting the importance of GP IIb/IIIa in the recognition of C. albicans.
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Affiliation(s)
- Lin Zheng
- Institute of Dermatology, Jiangsu Key Laboratory of Molecular Biology for Skin Diseases and Sexually Transmitted Infections, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing, China
| | - Zhimin Duan
- Institute of Dermatology, Jiangsu Key Laboratory of Molecular Biology for Skin Diseases and Sexually Transmitted Infections, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing, China
| | | | - Yanzhi He
- School of Public Health, Nanjing Medical University, Nanjing, China
| | - Xu Chen
- Institute of Dermatology, Jiangsu Key Laboratory of Molecular Biology for Skin Diseases and Sexually Transmitted Infections, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing, China.,School of Public Health, Nanjing Medical University, Nanjing, China
| | - Qing Chen
- Jiangsu Province Blood Center, Nanjing, China.,Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, China
| | - Min Li
- Institute of Dermatology, Jiangsu Key Laboratory of Molecular Biology for Skin Diseases and Sexually Transmitted Infections, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing, China.,Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, China
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60
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Neupane AS, Kubes P. Imaging reveals novel innate immune responses in lung, liver, and beyond. Immunol Rev 2021; 306:244-257. [PMID: 34816440 DOI: 10.1111/imr.13040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2021] [Accepted: 11/03/2021] [Indexed: 12/14/2022]
Abstract
Highly dynamic immune responses are generated toward pathogens or injuries, in vivo. Multiple immune cell types participate in various facets of the response which leads to a concerted effort in the removal and clearance of pathogens or injured tissue and a return to homeostasis. Intravital microscopy (IVM) has been extensively utilized to unravel the dynamics of immune responses, visualizing immune cell behavior in intact living tissues, within a living organism. For instance, the phenomenon of leukocyte recruitment cascade. Importantly, IVM has led to a deep appreciation that immune cell behavior and responses in individual organs are distinct, but also can influence one another. In this review, we discuss how IVM as a tool has been used to study the innate immune responses in various tissues during homeostasis, injury, and infection.
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Affiliation(s)
- Arpan Sharma Neupane
- Department of Physiology and Pharmacology, University of Calgary, Calgary, AB, Canada.,Department of Microbiology and Infectious Diseases, University of Calgary, Calgary, AB, Canada.,Calvin, Phoebe, and Joan Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB, Canada.,Institute for Immunity, Transplantation and Infection, Stanford University, Stanford, California, USA
| | - Paul Kubes
- Department of Physiology and Pharmacology, University of Calgary, Calgary, AB, Canada.,Department of Microbiology and Infectious Diseases, University of Calgary, Calgary, AB, Canada.,Calvin, Phoebe, and Joan Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB, Canada
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61
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Oliveira-Costa KM, Menezes GB, Paula Neto HA. Neutrophil accumulation within tissues: A damage x healing dichotomy. Biomed Pharmacother 2021; 145:112422. [PMID: 34781139 DOI: 10.1016/j.biopha.2021.112422] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 11/08/2021] [Accepted: 11/10/2021] [Indexed: 02/09/2023] Open
Abstract
The abundance of neutrophils in human circulation, their fast mobilization from blood to tissues, along with their alleged short life-span led to the image of neutrophils as a homogeneous cell type designed to fight infections and die in the process. Additionally, their granule content and capacity to produce molecules with considerable cytotoxic potential, lead to the general belief that neutrophil activation inexorably results in side effect of extensive tissue injury. Neutrophil activation in fact causes tissue injury as an adverse effect, but it seems that this is restricted to particular pathological situations and more of an "exception to the rule". Here we review evidences arising especially from intravital microscopy studies that demonstrate neutrophils as cells endowed with sophisticated mechanisms and able to engage in complex interactions as to minimize damage and optimize their effector functions. Moreover, neutrophil infiltration may even contribute to tissue healing and repair which may altogether demand a reexamination of current anti-inflammatory therapies that have neutrophil migration and activation as a target.
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Affiliation(s)
- Karen Marques Oliveira-Costa
- Center for Gastrointestinal Biology, Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais 31270-901, Brazil
| | - Gustavo B Menezes
- Center for Gastrointestinal Biology, Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais 31270-901, Brazil.
| | - Heitor A Paula Neto
- Laboratório de Alvos Moleculares, Departamento de Biotecnologia Farmacêutica, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
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62
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Jiang Y, Tang Y, Hoover C, Kondo Y, Huang D, Restagno D, Shao B, Gao L, Michael McDaniel J, Zhou M, Silasi-Mansat R, McGee S, Jiang M, Bai X, Lupu F, Ruan C, Marth JD, Wu D, Han Y, Xia L. Kupffer cell receptor CLEC4F is important for the destruction of desialylated platelets in mice. Cell Death Differ 2021; 28:3009-3021. [PMID: 33993195 PMCID: PMC8564511 DOI: 10.1038/s41418-021-00797-w] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 04/21/2021] [Accepted: 04/26/2021] [Indexed: 02/04/2023] Open
Abstract
The liver has recently been identified as a major organ for destruction of desialylated platelets. However, the underlying mechanism remains unclear. Kupffer cells, which are professional phagocytic cells in the liver, comprise the largest population of resident tissue macrophages in the body. Kupffer cells express a C-type lectin receptor, CLEC4F, that recognizes desialylated glycans with an unclear in vivo role in mediating platelet destruction. In this study, we generated a CLEC4F-deficient mouse model (Clec4f-/-) and found that CLEC4F was specifically expressed by Kupffer cells. Using the Clec4f-/- mice and a newly generated platelet-specific reporter mouse line, we revealed a critical role for CLEC4F on Kupffer cells in mediating destruction of desialylated platelets in the liver in vivo. Platelet clearance experiments and ultrastructural analysis revealed that desialylated platelets were phagocytized predominantly by Kupffer cells in a CLEC4F-dependent manner in mice. Collectively, these findings identify CLEC4F as a Kupffer cell receptor important for the destruction of desialylated platelets induced by bacteria-derived neuraminidases, which provide new insights into the pathogenesis of thrombocytopenia in disease conditions such as sepsis.
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Affiliation(s)
- Yizhi Jiang
- grid.429222.d0000 0004 1798 0228Jiangsu Institute of Hematology, National Clinical Research Center for Hematologic Diseases, NHC Key Laboratory of Thrombosis and Hemostasis, The First Affiliated Hospital of Soochow University, Suzhou, 215006 China ,grid.452929.10000 0004 8513 0241Department of Hematology, The First Affiliated Hospital of Wannan Medical College, Wuhu, 241001 China ,grid.274264.10000 0000 8527 6890Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104 USA ,grid.263761.70000 0001 0198 0694Collaborative Innovation Center of Hematology, Soochow University, Suzhou, 215006 China
| | - Yaqiong Tang
- grid.429222.d0000 0004 1798 0228Jiangsu Institute of Hematology, National Clinical Research Center for Hematologic Diseases, NHC Key Laboratory of Thrombosis and Hemostasis, The First Affiliated Hospital of Soochow University, Suzhou, 215006 China ,grid.274264.10000 0000 8527 6890Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104 USA ,grid.263761.70000 0001 0198 0694Collaborative Innovation Center of Hematology, Soochow University, Suzhou, 215006 China
| | - Christopher Hoover
- grid.274264.10000 0000 8527 6890Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104 USA
| | - Yuji Kondo
- grid.274264.10000 0000 8527 6890Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104 USA
| | - Dongping Huang
- grid.452929.10000 0004 8513 0241Department of Hematology, The First Affiliated Hospital of Wannan Medical College, Wuhu, 241001 China
| | - Damien Restagno
- grid.263761.70000 0001 0198 0694State Key Laboratory of Radiation Medicine and Protection, Soochow University, Suzhou, 215123 China
| | - Bojing Shao
- grid.274264.10000 0000 8527 6890Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104 USA
| | - Liang Gao
- grid.274264.10000 0000 8527 6890Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104 USA
| | - J. Michael McDaniel
- grid.274264.10000 0000 8527 6890Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104 USA
| | - Meixiang Zhou
- grid.274264.10000 0000 8527 6890Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104 USA
| | - Robert Silasi-Mansat
- grid.274264.10000 0000 8527 6890Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104 USA
| | - Samuel McGee
- grid.274264.10000 0000 8527 6890Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104 USA
| | - Miao Jiang
- grid.429222.d0000 0004 1798 0228Jiangsu Institute of Hematology, National Clinical Research Center for Hematologic Diseases, NHC Key Laboratory of Thrombosis and Hemostasis, The First Affiliated Hospital of Soochow University, Suzhou, 215006 China ,grid.263761.70000 0001 0198 0694Collaborative Innovation Center of Hematology, Soochow University, Suzhou, 215006 China
| | - Xia Bai
- grid.429222.d0000 0004 1798 0228Jiangsu Institute of Hematology, National Clinical Research Center for Hematologic Diseases, NHC Key Laboratory of Thrombosis and Hemostasis, The First Affiliated Hospital of Soochow University, Suzhou, 215006 China ,grid.263761.70000 0001 0198 0694Collaborative Innovation Center of Hematology, Soochow University, Suzhou, 215006 China ,grid.263761.70000 0001 0198 0694State Key Laboratory of Radiation Medicine and Protection, Soochow University, Suzhou, 215123 China
| | - Florea Lupu
- grid.274264.10000 0000 8527 6890Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104 USA
| | - Changgeng Ruan
- grid.429222.d0000 0004 1798 0228Jiangsu Institute of Hematology, National Clinical Research Center for Hematologic Diseases, NHC Key Laboratory of Thrombosis and Hemostasis, The First Affiliated Hospital of Soochow University, Suzhou, 215006 China ,grid.263761.70000 0001 0198 0694Collaborative Innovation Center of Hematology, Soochow University, Suzhou, 215006 China ,grid.263761.70000 0001 0198 0694State Key Laboratory of Radiation Medicine and Protection, Soochow University, Suzhou, 215123 China
| | - Jamey D. Marth
- grid.133342.40000 0004 1936 9676Center for Nanomedicine, SBP Medical Discovery Institute, and Department of Molecular, Cellular, and Developmental Biology, University of California, Santa Barbara, CA 93106 USA
| | - Depei Wu
- grid.429222.d0000 0004 1798 0228Jiangsu Institute of Hematology, National Clinical Research Center for Hematologic Diseases, NHC Key Laboratory of Thrombosis and Hemostasis, The First Affiliated Hospital of Soochow University, Suzhou, 215006 China ,grid.263761.70000 0001 0198 0694Collaborative Innovation Center of Hematology, Soochow University, Suzhou, 215006 China
| | - Yue Han
- grid.429222.d0000 0004 1798 0228Jiangsu Institute of Hematology, National Clinical Research Center for Hematologic Diseases, NHC Key Laboratory of Thrombosis and Hemostasis, The First Affiliated Hospital of Soochow University, Suzhou, 215006 China ,grid.263761.70000 0001 0198 0694Collaborative Innovation Center of Hematology, Soochow University, Suzhou, 215006 China
| | - Lijun Xia
- grid.429222.d0000 0004 1798 0228Jiangsu Institute of Hematology, National Clinical Research Center for Hematologic Diseases, NHC Key Laboratory of Thrombosis and Hemostasis, The First Affiliated Hospital of Soochow University, Suzhou, 215006 China ,grid.274264.10000 0000 8527 6890Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104 USA ,grid.263761.70000 0001 0198 0694Collaborative Innovation Center of Hematology, Soochow University, Suzhou, 215006 China
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63
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Leeten K, Jacques N, Lancellotti P, Oury C. Aspirin or Ticagrelor in Staphylococcus aureus Infective Endocarditis: Where Do We Stand? Front Cell Dev Biol 2021; 9:716302. [PMID: 34692677 PMCID: PMC8529053 DOI: 10.3389/fcell.2021.716302] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Accepted: 09/21/2021] [Indexed: 12/04/2022] Open
Abstract
Infective endocarditis is a challenging disease with a high mortality and morbidity rate. Antibiotic prophylaxis is currently recommended in high-risk infective endocarditis patients. However, the use of antibiotics faces the challenge of a low efficacy and contributes further to the emerging infection rate by antibiotic-resistant strains, emphasizing the need for new therapeutic strategies. Platelets are essential in the initial phase of infective endocarditis, acting as first-line immune responders. During the first phase of disease, bacteria can interact with platelets and counteract platelet antimicrobial activities. Mechanistic in vitro and animal studies on the effect of aspirin on bacteria-platelet interactions and the prevention of vegetation development showed promising results. However, data from clinical studies on the outcome of infective endocarditis patients who were receiving medically indicated aspirin therapy remain controversial. Therefore, the benefit of antiplatelet agents in infective endocarditis prevention has been questioned. Besides aspirin, it has been discovered that the platelet P2Y12 receptor antagonist ticagrelor has antibacterial properties in addition to its potent antiplatelet activity. Furthermore, a recent study in mice and a case report remarkably indicated the ability of this drug to eradicate Staphylococcus aureus bacteremia. This review will focus on current knowledge on antibacterial activity of ticagrelor, compared to aspirin, pointing out main unanswered questions. The goal is to provide food for thought as to whether a prior ticagrelor therapy might be beneficial for the prevention of infective endocarditis.
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Affiliation(s)
- Kirsten Leeten
- Laboratory of Cardiology, Department of Cardiology, GIGA Institute, University of Liège Hospital, Liège, Belgium
| | - Nicolas Jacques
- Laboratory of Cardiology, Department of Cardiology, GIGA Institute, University of Liège Hospital, Liège, Belgium
| | - Patrizio Lancellotti
- Laboratory of Cardiology, Department of Cardiology, GIGA Institute, University of Liège Hospital, Liège, Belgium.,Gruppo Villa Maria Care and Research, Maria Cecilia Hospital, Cotignola, and Anthea Hospital, Bari, Italy
| | - Cécile Oury
- Laboratory of Cardiology, Department of Cardiology, GIGA Institute, University of Liège Hospital, Liège, Belgium
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64
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A Multi-Modal Toolkit for Studying Neutrophils in Cancer and Beyond. Cancers (Basel) 2021; 13:cancers13215331. [PMID: 34771495 PMCID: PMC8582456 DOI: 10.3390/cancers13215331] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 10/18/2021] [Accepted: 10/21/2021] [Indexed: 12/15/2022] Open
Abstract
Simple Summary Neutrophils are critical immune cells in host defense and maintenance of tissue homeostasis. Studying the complex and diverse functions of these innate immune cells requires a comprehensive toolkit of experimental techniques to elucidate the function and regulation of neutrophils in health and disease. In this review, we discuss key methodologies and their applications in neutrophil research, including in vivo imaging, ex vivo functional assays, and high dimensional single-cell technologies, and how they can be integrated into a multi-modal approach to study neutrophil function in cancer and other diseases. Abstract As key effector cells of the innate immune response, neutrophils are rapidly deployed to sites of inflammation where they deliver a payload of potent effector mechanisms that are essential for host defense against pathogens as well as tissue homeostasis. In addition, neutrophils are central contributors to the pathogenesis of a vast spectrum of inflammatory, degenerative, and neoplastic diseases. As our understanding of neutrophils in health and disease continually expands, so too does our appreciation of their complex and dynamic nature in vivo; from development, maturation, and trafficking to cellular heterogeneity and functional plasticity. Therefore, contemporary neutrophil research relies on multiple complementary methodologies to perform integrated analysis of neutrophil phenotypic heterogeneity, organ- and stimulus-specific trafficking mechanisms, as well as tailored effector functions in vivo. This review discusses established and emerging technologies used to study neutrophils, with a focus on in vivo imaging in animal models, as well as next-generation ex vivo model systems to study mechanisms of neutrophil function. Furthermore, we discuss how high-dimensional single-cell analysis technologies are driving a renaissance in neutrophil biology by redefining our understanding of neutrophil development, heterogeneity, and functional plasticity. Finally, we discuss innovative applications and emerging opportunities to integrate these high-dimensional, multi-modal techniques to deepen our understanding of neutrophils in cancer research and beyond.
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65
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Page MJ, Pretorius E. Platelet Behavior Contributes to Neuropathologies: A Focus on Alzheimer's and Parkinson's Disease. Semin Thromb Hemost 2021; 48:382-404. [PMID: 34624913 DOI: 10.1055/s-0041-1733960] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The functions of platelets are broad. Platelets function in hemostasis and thrombosis, inflammation and immune responses, vascular regulation, and host defense against invading pathogens, among others. These actions are achieved through the release of a wide set of coagulative, vascular, inflammatory, and other factors as well as diverse cell surface receptors involved in the same activities. As active participants in these physiological processes, platelets become involved in signaling pathways and pathological reactions that contribute to diseases that are defined by inflammation (including by pathogen-derived stimuli), vascular dysfunction, and coagulation. These diseases include Alzheimer's and Parkinson's disease, the two most common neurodegenerative diseases. Despite their unique pathological and clinical features, significant shared pathological processes exist between these two conditions, particularly relating to a central inflammatory mechanism involving both neuroinflammation and inflammation in the systemic environment, but also neurovascular dysfunction and coagulopathy, processes which also share initiation factors and receptors. This triad of dysfunction-(neuro)inflammation, neurovascular dysfunction, and hypercoagulation-illustrates the important roles platelets play in neuropathology. Although some mechanisms are understudied in Alzheimer's and Parkinson's disease, a strong case can be made for the relevance of platelets in neurodegeneration-related processes.
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Affiliation(s)
- Martin J Page
- Department of Physiological Sciences, Faculty of Science, Stellenbosch University, Stellenbosch, Private Bag X1 Matieland, South Africa
| | - Etheresia Pretorius
- Department of Physiological Sciences, Faculty of Science, Stellenbosch University, Stellenbosch, Private Bag X1 Matieland, South Africa
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66
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Peng M, Deng F, Qi D, Hu Z, Zhang L. The Hyperbilirubinemia and Potential Predictors Influence on Long-Term Outcomes in Sepsis: A Population-Based Propensity Score-Matched Study. Front Med (Lausanne) 2021; 8:713917. [PMID: 34604255 PMCID: PMC8484885 DOI: 10.3389/fmed.2021.713917] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Accepted: 08/16/2021] [Indexed: 01/20/2023] Open
Abstract
Objective: Although hyperbilirubinemia has been associated with mortality in patients who are critically ill, yet no clinical studies dissect the effect of dynamic change of hyperbilirubinemia on long-term septic prognosis. The study aims to investigate the specific stages of hyperbilirubinemia and potential risk factors on long-term outcomes in patients with sepsis. Methods: In this retrospective observational cohort study, patients with sepsis, without previous chronic liver diseases, were identified from the Medical Information Mart for the Intensive Care III MIMIC-III database. We used propensity scores (PS) to adjust the baseline differences in septic patients with hyperbilirubinemia or not. The multivariate Cox was employed to investigate the predictors that influence a clinical outcome in sepsis. Results: Of 2,784 patients with sepsis, hyperbilirubinemia occurred in 544 patients (19.5%). After PS matching, a survival curve demonstrated that patients with sepsis with the new onset of total bilirubin (TBIL) levels more than or equal to 5 mg/dl survived at significantly lower rates than those with TBIL levels <5 mg/dl. Multivariate Cox hazard analysis showed that patients with TBIL at more than or equal to 5 mg/dl during sepsis exhibit 1.608 times (95% CI: 1.228-2.106) higher risk of 1-year mortality than those with TBIL levels <5 mg/dl. Also, age above 65 years old, preexisting malignancy, a respiratory rate above 30 beats/min at admission, serum parameters levels within 24-h admission, containing international normalized ratio (INR) above 1.5, platelet <50*10∧9/L, lactate above 4 mmol/L, and bicarbonate <22 or above 29 mmol/L are the independent risk factors for long-term mortality of patients with sepsis. Conclusions: After PS matching, serum TBIL levels at more than or equal to 5 mg/dl during hospitality are associated with increased long-term mortality for patients with sepsis. This study may provide clinicians with some cutoff values for early intervention, which may improve the prognosis of patients with sepsis.
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Affiliation(s)
- Milin Peng
- Department of Critical Care Medicine, Xiangya Hospital, Central South University, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Fuxing Deng
- Department of Critical Care Medicine, Xiangya Hospital, Central South University, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Desheng Qi
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China.,Department of Emergency, Xiangya Hospital, Central South University, Changsha, China
| | - Zhonghua Hu
- Department of Critical Care Medicine, Xiangya Hospital, Central South University, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China.,Hunan Key Laboratory of Molecular Precision Medicine, Xiangya Hospital, Institute of Molecular Precision Medicine, Central South University, Changsha, China
| | - Lina Zhang
- Department of Critical Care Medicine, Xiangya Hospital, Central South University, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
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Rabouel Y, Magnenat S, Delabranche X, Gachet C, Hechler B. Platelet P2Y 12 Receptor Deletion or Pharmacological Inhibition does not Protect Mice from Sepsis or Septic Shock. TH OPEN 2021; 5:e343-e352. [PMID: 34447900 PMCID: PMC8384481 DOI: 10.1055/s-0041-1733857] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2021] [Accepted: 07/06/2021] [Indexed: 12/27/2022] Open
Abstract
Introduction
Platelets are increasingly appreciated as key effectors during sepsis, raising the question of the usefulness of antiplatelet drugs to treat patients with sepsis.
Objective
Evaluate the potential contribution of the platelet P2Y
12
receptor in the pathogenesis of polymicrobial-induced sepsis and septic shock in mice.
Methods
The effects of P2Y
12
inhibition using clopidogrel treatment and of platelet-specific deletion of the P2Y
12
receptor in mice were examined in two severity grades of cecal ligation and puncture (CLP) leading to mild sepsis or septic shock.
Results
Twenty hours after induction of the high grade CLP, clopidogrel- and vehicle-treated mice displayed a similar 30% decrease in mean arterial blood pressure (MAP) characteristic of shock. Septic shock-induced thrombocytopenia was not modified by clopidogrel treatment. Plasma concentrations of inflammatory cytokines and myeloperoxidase (MPO) were similarly increased in clopidogrel- and vehicle-treated mice, indicating comparable increase in systemic inflammation. Thrombin-antithrombin (TAT) complexes and the extent of organ damage were also similar. In mild-grade CLP, clopidogrel- and vehicle-treated mice did not display a significant decrease in MAP, while thrombocytopenia and plasma concentrations of TNFα, IL6, IL10, MPO, TAT and organ damage reached similar levels in both groups, although lower than those reached in the high grade CLP. Similarly, mice with platelet-specific deletion of the P2Y
12
receptor were not protected from CLP-induced sepsis or septic shock.
Conclusion
The platelet P2Y
12
receptor does not contribute to the pathogenesis of sepsis or septic shock in mice, suggesting that P2Y
12
receptor antagonists may not be beneficial in patients with sepsis or septic shock.
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Affiliation(s)
- Yannick Rabouel
- Université de Strasbourg, INSERM, Etablissement Français du Sang (EFS)-Grand Est, BPPS UMR_S 1255, Fédération de Médecine Translationnelle de Strasbourg (FMTS), F-67000 Strasbourg, France
| | - Stéphanie Magnenat
- Université de Strasbourg, INSERM, Etablissement Français du Sang (EFS)-Grand Est, BPPS UMR_S 1255, Fédération de Médecine Translationnelle de Strasbourg (FMTS), F-67000 Strasbourg, France
| | - Xavier Delabranche
- Hôpitaux Universitaires de Strasbourg, Anesthésie, Réanimation et Médecine périopératoire, Nouvel Hôpital Civil, F-67000 Strasbourg, France
| | - Christian Gachet
- Université de Strasbourg, INSERM, Etablissement Français du Sang (EFS)-Grand Est, BPPS UMR_S 1255, Fédération de Médecine Translationnelle de Strasbourg (FMTS), F-67000 Strasbourg, France
| | - Beatrice Hechler
- Université de Strasbourg, INSERM, Etablissement Français du Sang (EFS)-Grand Est, BPPS UMR_S 1255, Fédération de Médecine Translationnelle de Strasbourg (FMTS), F-67000 Strasbourg, France
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Vacani-Martins N, Meuser-Batista M, dos Santos CDLP, Hasslocher-Moreno AM, Henriques-Pons A. The Liver and the Hepatic Immune Response in Trypanosoma cruzi Infection, a Historical and Updated View. Pathogens 2021; 10:pathogens10091074. [PMID: 34578107 PMCID: PMC8465576 DOI: 10.3390/pathogens10091074] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Revised: 08/05/2021] [Accepted: 08/11/2021] [Indexed: 12/12/2022] Open
Abstract
Chagas disease was described more than a century ago and, despite great efforts to understand the underlying mechanisms that lead to cardiac and digestive manifestations in chronic patients, much remains to be clarified. The disease is found beyond Latin America, including Japan, the USA, France, Spain, and Australia, and is caused by the protozoan Trypanosoma cruzi. Dr. Carlos Chagas described Chagas disease in 1909 in Brazil, and hepatomegaly was among the clinical signs observed. Currently, hepatomegaly is cited in most papers published which either study acutely infected patients or experimental models, and we know that the parasite can infect multiple cell types in the liver, especially Kupffer cells and dendritic cells. Moreover, liver damage is more pronounced in cases of oral infection, which is mainly found in the Amazon region. However, the importance of liver involvement, including the hepatic immune response, in disease progression does not receive much attention. In this review, we present the very first paper published approaching the liver's participation in the infection, as well as subsequent papers published in the last century, up to and including our recently published results. We propose that, after infection, activated peripheral T lymphocytes reach the liver and induce a shift to a pro-inflammatory ambient environment. Thus, there is an immunological integration and cooperation between peripheral and hepatic immunity, contributing to disease control.
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Affiliation(s)
- Natalia Vacani-Martins
- Laboratório de Inovações em Terapias, Ensino e Bioprodutos, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro 21041-361, Brazil; (N.V.-M.); (C.d.L.P.d.S.)
| | - Marcelo Meuser-Batista
- Depto de Anatomia Patológica e Citopatologia, Instituto Fernandes Figueira, Fundação Oswaldo Cruz, Rio de Janeiro 22250-020, Brazil;
| | - Carina de Lima Pereira dos Santos
- Laboratório de Inovações em Terapias, Ensino e Bioprodutos, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro 21041-361, Brazil; (N.V.-M.); (C.d.L.P.d.S.)
| | | | - Andrea Henriques-Pons
- Laboratório de Inovações em Terapias, Ensino e Bioprodutos, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro 21041-361, Brazil; (N.V.-M.); (C.d.L.P.d.S.)
- Correspondence:
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69
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Pérez-Olivares L, Soehnlein O. Contemporary Lifestyle and Neutrophil Extracellular Traps: An Emerging Link in Atherosclerosis Disease. Cells 2021; 10:1985. [PMID: 34440753 PMCID: PMC8394440 DOI: 10.3390/cells10081985] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 07/29/2021] [Accepted: 07/30/2021] [Indexed: 12/15/2022] Open
Abstract
Neutrophil extracellular traps (NETs) are networks of extracellular genetic material decorated with proteins of nuclear, granular and cytosolic origin that activated neutrophils expel under pathogenic inflammatory conditions. NETs are part of the host's innate immune defense system against invading pathogens. Interestingly, these extracellular structures can also be released in response to sterile inflammatory stimuli (e.g., shear stress, lipidic molecules, pro-thrombotic factors, aggregated platelets, or pro-inflammatory cytokines), as in atherosclerosis disease. Indeed, NETs have been identified in the intimal surface of diseased arteries under cardiovascular disease conditions, where they sustain inflammation via NET-mediated cell-adhesion mechanisms and promote cellular dysfunction and tissue damage via NET-associated cytotoxicity. This review will focus on (1) the active role of neutrophils and NETs as underestimated players of the inflammatory process during atherogenesis and lesion progression; (2) how these extracellular structures communicate with the main cell types present in the atherosclerotic lesion in the arterial wall; and (3) how these neutrophil effector functions interplay with lifestyle-derived risk factors such as an unbalanced diet, physical inactivity, smoking or lack of sleep quality, which represent major elements in the development of cardiovascular disease.
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Affiliation(s)
- Laura Pérez-Olivares
- Center for Molecular Biology of Inflammation (ZMBE), Institute for Experimental Pathology (ExPat), Westfälische Wilhelms-Universität (WWU), 48149 Münster, Germany;
| | - Oliver Soehnlein
- Center for Molecular Biology of Inflammation (ZMBE), Institute for Experimental Pathology (ExPat), Westfälische Wilhelms-Universität (WWU), 48149 Münster, Germany;
- Department of Physiology and Pharmacology (FyFa), Karolinska Institute, 17165 Stockholm, Sweden
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70
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Langelage M, Better J, Wetstein M, Selvakumar B, Malainou C, Kimmig L, Arneth B, Köhler K, Herden C, Herold S, Matt U. Acid Aspiration Impairs Antibacterial Properties of Liver Macrophages. Am J Respir Cell Mol Biol 2021; 64:641-643. [PMID: 33929292 DOI: 10.1165/rcmb.2020-0575le] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Affiliation(s)
| | | | | | - Balachandar Selvakumar
- Biomedicine Research Institute of Buenos Aires - CONICET-Partner Institute of the Max Planck Society (IBioBA-MPSP) Buenos Aires, Argentina.,Max Planck Institute for Heart and Lung Research Bad Nauheim, Germany
| | | | - Lucas Kimmig
- Justus-Liebig-University Giessen Giessen, Germany.,University of Chicago Medicine Chicago, Illinois and
| | | | - Kernt Köhler
- Justus-Liebig-University Giessen Giessen, Germany
| | | | | | - Ulrich Matt
- Justus-Liebig-University Giessen Giessen, Germany
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71
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Sun J, Uchiyama S, Olson J, Morodomi Y, Cornax I, Ando N, Kohno Y, Kyaw MMT, Aguilar B, Haste NM, Kanaji S, Kanaji T, Rose WE, Sakoulas G, Marth JD, Nizet V. Repurposed drugs block toxin-driven platelet clearance by the hepatic Ashwell-Morell receptor to clear Staphylococcus aureus bacteremia. Sci Transl Med 2021; 13:13/586/eabd6737. [PMID: 33762439 DOI: 10.1126/scitranslmed.abd6737] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2020] [Accepted: 03/01/2021] [Indexed: 12/13/2022]
Abstract
Staphylococcus aureus (SA) bloodstream infections cause high morbidity and mortality (20 to 30%) despite modern supportive care. In a human bacteremia cohort, we found that development of thrombocytopenia was correlated to increased mortality and increased α-toxin expression by the pathogen. Platelet-derived antibacterial peptides are important in bloodstream defense against SA, but α-toxin decreased platelet viability, induced platelet sialidase to cause desialylation of platelet glycoproteins, and accelerated platelet clearance by the hepatic Ashwell-Morell receptor (AMR). Ticagrelor (Brilinta), a commonly prescribed P2Y12 receptor inhibitor used after myocardial infarction, blocked α-toxin-mediated platelet injury and resulting thrombocytopenia, thereby providing protection from lethal SA infection in a murine intravenous challenge model. Genetic deletion or pharmacological inhibition of AMR stabilized platelet counts and enhanced resistance to SA infection, and the anti-influenza sialidase inhibitor oseltamivir (Tamiflu) provided similar therapeutic benefit. Thus, a "toxin-platelet-AMR" regulatory pathway plays a critical role in the pathogenesis of SA bloodstream infection, and its elucidation provides proof of concept for repurposing two commonly prescribed drugs as adjunctive therapies to improve patient outcomes.
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Affiliation(s)
- Josh Sun
- Biomedical Sciences Graduate Program, UC San Diego, La Jolla, CA 92093, USA.,Department of Pediatrics, UC San Diego, La Jolla, CA 92093, USA.,Skaggs School of Pharmacy and Pharmaceutical Sciences, UC San Diego, La Jolla, CA 92093, USA
| | - Satoshi Uchiyama
- Biomedical Sciences Graduate Program, UC San Diego, La Jolla, CA 92093, USA
| | - Joshua Olson
- Biomedical Sciences Graduate Program, UC San Diego, La Jolla, CA 92093, USA
| | - Yosuke Morodomi
- Department of Molecular Medicine, MERU-Roon Research Center on Vascular Biology, Scripps Research, La Jolla, CA 92037, USA
| | - Ingrid Cornax
- Biomedical Sciences Graduate Program, UC San Diego, La Jolla, CA 92093, USA
| | - Nao Ando
- Biomedical Sciences Graduate Program, UC San Diego, La Jolla, CA 92093, USA
| | - Yohei Kohno
- Biomedical Sciences Graduate Program, UC San Diego, La Jolla, CA 92093, USA
| | - May M T Kyaw
- Biomedical Sciences Graduate Program, UC San Diego, La Jolla, CA 92093, USA
| | - Bernice Aguilar
- Biomedical Sciences Graduate Program, UC San Diego, La Jolla, CA 92093, USA
| | - Nina M Haste
- Biomedical Sciences Graduate Program, UC San Diego, La Jolla, CA 92093, USA.,Department of Pediatrics, UC San Diego, La Jolla, CA 92093, USA.,Skaggs School of Pharmacy and Pharmaceutical Sciences, UC San Diego, La Jolla, CA 92093, USA
| | - Sachiko Kanaji
- Department of Molecular Medicine, MERU-Roon Research Center on Vascular Biology, Scripps Research, La Jolla, CA 92037, USA
| | - Taisuke Kanaji
- Department of Molecular Medicine, MERU-Roon Research Center on Vascular Biology, Scripps Research, La Jolla, CA 92037, USA
| | - Warren E Rose
- School of Pharmacy, University of Wisconsin, Madison, WI 53705, USA
| | - George Sakoulas
- Department of Pediatrics, UC San Diego, La Jolla, CA 92093, USA
| | - Jamey D Marth
- Center for Nanomedicine, UC Santa Barbara, Santa Barbara, CA 93106, USA.,Sanford Burnham Prebys Medical Discovery Institute, UC Santa Barbara, Santa Barbara, CA 93106, USA
| | - Victor Nizet
- Biomedical Sciences Graduate Program, UC San Diego, La Jolla, CA 92093, USA. .,Department of Pediatrics, UC San Diego, La Jolla, CA 92093, USA.,Skaggs School of Pharmacy and Pharmaceutical Sciences, UC San Diego, La Jolla, CA 92093, USA
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72
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Hamad MA, Schanze N, Schommer N, Nührenberg T, Duerschmied D. Reticulated Platelets-Which Functions Have Been Established by In Vivo and In Vitro Data? Cells 2021; 10:cells10051172. [PMID: 34065800 PMCID: PMC8150321 DOI: 10.3390/cells10051172] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 04/29/2021] [Accepted: 05/10/2021] [Indexed: 12/18/2022] Open
Abstract
Reticulated platelets (RP) are the youngest platelet fraction released into the circulation. These immature platelets have increased RNA content, a larger cell volume, more dense granules, higher levels of surface activation markers and are thought to be more reactive compared to their mature counterparts. RP have been associated with cardiovascular disease, diabetes and increased mortality. Yet only a few animal studies investigating RP have been conducted so far and further investigations are warranted. Established methods to count RP are flow cytometry (staining with thiazole orange or SYTO13) or fully automated hematology analyzers (immature platelet fraction, IPF). IPF has been established as a diagnostic parameter in thrombocytopenia, cardiovascular disease and, in particular, the response to antiplatelet therapy. This review seeks to provide an overview of the key features of RP as well as preanalytical and analytical aspects that need to be considered when working with this platelet population.
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Affiliation(s)
- Muataz Ali Hamad
- Department of Cardiology and Angiology I, Heart Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg im Breisgau, Germany; (N.S.); (N.S.); (D.D.)
- Spemann Graduate School of Biology and Medicine (SGBM), University of Freiburg, 79104 Freiburg im Breisgau, Germany
- Faculty of Biology, University of Freiburg, 79104 Freiburg im Breisgau, Germany
- Correspondence: ; Tel.: +49-761-270-70470
| | - Nancy Schanze
- Department of Cardiology and Angiology I, Heart Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg im Breisgau, Germany; (N.S.); (N.S.); (D.D.)
| | - Nicolas Schommer
- Department of Cardiology and Angiology I, Heart Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg im Breisgau, Germany; (N.S.); (N.S.); (D.D.)
| | - Thomas Nührenberg
- Department of Cardiology and Angiology II, Heart Center, Faculty of Medicine, University of Freiburg, 79189 Bad Krozingen, Germany;
| | - Daniel Duerschmied
- Department of Cardiology and Angiology I, Heart Center, Faculty of Medicine, University of Freiburg, 79106 Freiburg im Breisgau, Germany; (N.S.); (N.S.); (D.D.)
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73
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Nonalcoholic fatty liver disease (NAFLD) severity is associated to a nonhemostatic contribution and proinflammatory phenotype of platelets. Transl Res 2021; 231:24-38. [PMID: 33171266 DOI: 10.1016/j.trsl.2020.11.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 10/16/2020] [Accepted: 11/03/2020] [Indexed: 02/07/2023]
Abstract
Nonalcoholic fatty liver disease (NAFLD) is the main cause of chronic liver disease and ranges from simple steatosis to nonalcoholic steatohepatitis. Recently, a platelet role in NAFLD pathogenesis and progression has been reported in mouse models and in patients. We investigated whether platelets are involved in liver and systemic inflammation processes in NAFLD. In this exploratory study we recruited 24 consecutive patients with biopsy-proven diagnosis of NAFLD and 17 healthy volunteers. We measured plasma levels of inflammatory markers by ELISA. We investigated hemostatic and inflammatory transcripts in circulating platelets and leukocytes from NAFLD patients. We analyzed platelet and neutrophil extracellular traps (NET) accumulations in liver sinusoids using CD42 and H3 citrullinated histones immunohistochemical staining on liver biopsies. NAFLD patients had increased inflammation markers and lipolysaccharides plasma levels. We found significant increase of inflammatory transcripts in circulating platelets and not in leukocytes of NAFLD subjects compared with healthy controls. We demonstrated increased intrahepatic platelet accumulation that correlated with NAFLD activity score (NAS) score and intrahepatic neutrophil extracellular traps (NET) formation in liver biopsies of NAFLD patients. NET formation was higher in livers with higher NAS and inflammation scores. The presence of low-grade systemic inflammation and proinflammatory changes of circulating platelets indicate that platelets participate on systemic inflammatory changes associated with NAFLD. Liver platelet accumulation and liver NET formation, together with low-grade endotoxemia, suggest that platelets may act to protect the liver from invading microorganisms by favoring local NET formation.
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74
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Mariscal A, Zamora C, Magallares B, Salman-Monte TC, Ortiz MÀ, Díaz-Torné C, Castellví I, Corominas H, Vidal S. Phenotypic and Functional Consequences of PLT Binding to Monocytes and Its Association with Clinical Features in SLE. Int J Mol Sci 2021; 22:4719. [PMID: 33947017 PMCID: PMC8125177 DOI: 10.3390/ijms22094719] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 04/21/2021] [Accepted: 04/26/2021] [Indexed: 12/15/2022] Open
Abstract
Platelets (PLTs) can modulate the immune system through the release of soluble mediators or through interaction with immune cells. Monocytes are the main immune cells that bind with PLTs, and this interaction is increased in several inflammatory and autoimmune conditions, including systemic lupus erythematosus (SLE). Our aim was to characterize the phenotypic and functional consequences of PLT binding to monocytes in healthy donors (HD) and in SLE and to relate it to the pathogenesis of SLE. We analyzed the phenotypic and functional features of monocytes with non-activated and activated bound PLTs by flow cytometry. We observed that monocytes with bound PLTs and especially those with activated PLTs have an up-regulated HLA-DR, CD86, CD54, CD16 and CD64 expression. Monocytes with bound PLTs also have an increased capacity for phagocytosis, though not for efferocytosis. In addition, monocytes with bound PLTs have increased IL-10, but not TNF-α, secretion. The altered phenotypic and functional features are comparable in SLE and HD monocytes and in bound PLTs. However, the percentages of monocytes with bound PLTs are significantly higher in SLE patients and are associated with undetectable levels of anti-dsDNA antibodies and hematuria, and with normal C3 and albumin/creatinine levels. Our results suggest that PLTs have a modulatory influence on monocytes and that this effect may be highlighted by an increased binding of PLTs to monocytes in autoimmune conditions.
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Affiliation(s)
- Anaís Mariscal
- Immunology Department, Hospital de la Santa Creu I Sant Pau, Biomedical Research Institute Sant Pau (IIB Sant Pau), 08041 Barcelona, Spain;
| | - Carlos Zamora
- Laboratory of Inflammatory Diseases, Hospital de la Santa Creu I Sant Pau, Biomedical Research Institute Sant Pau (IIB Sant Pau), 08041 Barcelona, Spain; (C.Z.); (M.À.O.)
| | - Berta Magallares
- Rheumatology Department, Hospital de la Santa Creu I Sant Pau, 08041 Barcelona, Spain; (B.M.); (C.D.-T.); (I.C.); (H.C.)
| | | | - Mª Àngels Ortiz
- Laboratory of Inflammatory Diseases, Hospital de la Santa Creu I Sant Pau, Biomedical Research Institute Sant Pau (IIB Sant Pau), 08041 Barcelona, Spain; (C.Z.); (M.À.O.)
| | - Cesar Díaz-Torné
- Rheumatology Department, Hospital de la Santa Creu I Sant Pau, 08041 Barcelona, Spain; (B.M.); (C.D.-T.); (I.C.); (H.C.)
| | - Iván Castellví
- Rheumatology Department, Hospital de la Santa Creu I Sant Pau, 08041 Barcelona, Spain; (B.M.); (C.D.-T.); (I.C.); (H.C.)
| | - Héctor Corominas
- Rheumatology Department, Hospital de la Santa Creu I Sant Pau, 08041 Barcelona, Spain; (B.M.); (C.D.-T.); (I.C.); (H.C.)
| | - Silvia Vidal
- Laboratory of Inflammatory Diseases, Hospital de la Santa Creu I Sant Pau, Biomedical Research Institute Sant Pau (IIB Sant Pau), 08041 Barcelona, Spain; (C.Z.); (M.À.O.)
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75
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Eshmuminov D, Mueller M, Brugger SD, Bautista Borrego L, Becker D, Hefti M, Hagedorn C, Duskabilova M, Tibbitt MW, Dutkowski P, Rudolf von Rohr P, Schuler MJ, Mueller NJ, Clavien PA. Sources and prevention of graft infection during long-term ex situ liver perfusion. Transpl Infect Dis 2021; 23:e13623. [PMID: 33887094 DOI: 10.1111/tid.13623] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 03/31/2021] [Accepted: 04/12/2021] [Indexed: 01/11/2023]
Abstract
INTRODUCTION The use of normothermic liver machine perfusion to repair injured grafts ex situ is an emerging topic of clinical importance. However, a major concern is the possibility of microbial contamination in the absence of a fully functional immune system. Here, we report a standardized approach to maintain sterility during normothermic liver machine perfusion of porcine livers for one week. METHODS Porcine livers (n = 42) were procured and perfused with blood at 34°C following aseptic technique and standard operating procedures. The antimicrobial prophylaxis was adapted and improved in a step-wise manner taking into account the pathogens that were detected during the development phase. Piperacillin-Tazobactam was applied as a single dose initially and modified to continuous application in the final protocol. In addition, the perfusion machine was improved to recapitulate partially the host's defense system. The final protocol was tested for infection prevention during one week of perfusion. RESULTS During the development phase, microbial contamination occurred in 27 out of 39 (69%) livers with a mean occurrence of growth on 4 ± 1.6 perfusion days. The recovered microorganisms suggested an exogenous source of microbial contamination. The antimicrobial agents (piperacillin/tazobactam) could be maintained above the targeted minimal inhibitory concentration (8-16 mg/L) only with continuous application. In addition to continuous application of piperacillin/tazobactam, partial recapitulation of the host immune system ex situ accompanied by strict preventive measures for contact and air contamination maintained sterility during one week of perfusion. CONCLUSION The work demonstrates feasibility of sterility maintenance for one week during ex situ normothermic liver perfusion.
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Affiliation(s)
- Dilmurodjon Eshmuminov
- Department of Surgery, Swiss Hepatopancreatobiliary and Transplantation Center, University Hospital Zurich, Zurich, Switzerland
| | - Matteo Mueller
- Department of Surgery, Swiss Hepatopancreatobiliary and Transplantation Center, University Hospital Zurich, Zurich, Switzerland
| | - Silvio D Brugger
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, Zurich, Switzerland
| | - Lucia Bautista Borrego
- Department of Surgery, Swiss Hepatopancreatobiliary and Transplantation Center, University Hospital Zurich, Zurich, Switzerland
| | - Dustin Becker
- Wyss Zurich, ETH Zurich/University of Zurich, Zurich, Switzerland
| | - Max Hefti
- Wyss Zurich, ETH Zurich/University of Zurich, Zurich, Switzerland
| | - Catherine Hagedorn
- Department of Surgery, Swiss Hepatopancreatobiliary and Transplantation Center, University Hospital Zurich, Zurich, Switzerland
| | - Muhayyo Duskabilova
- Department of Surgery, Swiss Hepatopancreatobiliary and Transplantation Center, University Hospital Zurich, Zurich, Switzerland
| | - Mark W Tibbitt
- Macromolecular Engineering Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, Zurich, Switzerland
| | - Philipp Dutkowski
- Department of Surgery, Swiss Hepatopancreatobiliary and Transplantation Center, University Hospital Zurich, Zurich, Switzerland
| | - Philipp Rudolf von Rohr
- Transport Processes and Reactions Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, Zurich, Switzerland
| | - Martin J Schuler
- Wyss Zurich, ETH Zurich/University of Zurich, Zurich, Switzerland
| | - Nicolas J Mueller
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, Zurich, Switzerland
| | - Pierre-Alain Clavien
- Department of Surgery, Swiss Hepatopancreatobiliary and Transplantation Center, University Hospital Zurich, Zurich, Switzerland
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76
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Pentraxin 3 expression in lungs and neutrophils of calves. Vet Immunol Immunopathol 2021; 236:110251. [PMID: 33901710 DOI: 10.1016/j.vetimm.2021.110251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 04/15/2021] [Accepted: 04/18/2021] [Indexed: 11/23/2022]
Abstract
Bacterial lung disease caused by Mannheimia haemolytica inflict significant mortality and morbidity resulting in enormous economic losses to cattle industry. The use of antibiotics is becoming more challenging because of development of anti-microbial resistance. The innate immune system plays a critical role in the initiation of immune response in the lung. Pentraxin 3 (PTX3), a pattern-recognition receptor is produced at sites of inflammation by many cell types, recognizes and binds to many pathogens, activates the complement cascade, and has a role in the clearance of apoptotic and necrotic cells. Because there are very few data on the expression of PTX3 in the lungs, we examined PTX3 expression in lungs of normal and M. haemolytica-infected calves and normal and E. coli lipopolysaccharide-treated cattle neutrophils using light and electron microscopic immunochemistry and Western blots. Immunohistology showed the presence of PTX3 in airway epithelial cells, alveolar septa and macrophages in normal and inflamed lungs of calves and the blots showed a significant increase in the expression of PTX3 in lungs from infected calves. Immuno-gold electron microscopy showed PTX3 in the nuclei, cytoplasm, and vesicular organelles of alveolar macrophages, endothelial cells and pulmonary intravascular macrophages (PIMs). Immunohistochemical staining for PTX3 in peripheral blood neutrophils shows an altered staining pattern in neutrophils stimulated with lipopolysachharide (LPS). However, western blots no significant change in PTX3 amount in LPS-treated neutrophils compared to the controls. These are the first data on the expression of PTX3 in the lungs and the neutrophils of cattle which may add to our understanding of innate immunity in cattle lungs.
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77
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Zindel J, Peiseler M, Hossain M, Deppermann C, Lee WY, Haenni B, Zuber B, Deniset JF, Surewaard BGJ, Candinas D, Kubes P. Primordial GATA6 macrophages function as extravascular platelets in sterile injury. Science 2021; 371:371/6533/eabe0595. [PMID: 33674464 DOI: 10.1126/science.abe0595] [Citation(s) in RCA: 69] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Accepted: 01/08/2021] [Indexed: 12/14/2022]
Abstract
Most multicellular organisms have a major body cavity that harbors immune cells. In primordial species such as purple sea urchins, these cells perform phagocytic functions but are also crucial in repairing injuries. In mammals, the peritoneal cavity contains large numbers of resident GATA6+ macrophages, which may function similarly. However, it is unclear how cavity macrophages suspended in the fluid phase (peritoneal fluid) identify and migrate toward injuries. In this study, we used intravital microscopy to show that cavity macrophages in fluid rapidly form thrombus-like structures in response to injury by means of primordial scavenger receptor cysteine-rich domains. Aggregates of cavity macrophages physically sealed injuries and promoted rapid repair of focal lesions. In iatrogenic surgical situations, these cavity macrophages formed extensive aggregates that promoted the growth of intra-abdominal scar tissue known as peritoneal adhesions.
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Affiliation(s)
- J Zindel
- Department of Pharmacology and Physiology, University of Calgary, Calgary, Alberta, Canada.,Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Department of Microbiology, Immunology and Infectious Diseases, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Department of Visceral Surgery and Medicine, Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland
| | - M Peiseler
- Department of Pharmacology and Physiology, University of Calgary, Calgary, Alberta, Canada.,Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Department of Microbiology, Immunology and Infectious Diseases, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - M Hossain
- Department of Pharmacology and Physiology, University of Calgary, Calgary, Alberta, Canada.,Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Department of Microbiology, Immunology and Infectious Diseases, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - C Deppermann
- Department of Pharmacology and Physiology, University of Calgary, Calgary, Alberta, Canada.,Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Department of Microbiology, Immunology and Infectious Diseases, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Institute of Clinical Chemistry and Laboratory Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - W Y Lee
- Department of Pharmacology and Physiology, University of Calgary, Calgary, Alberta, Canada.,Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - B Haenni
- Institute of Anatomy, University of Bern, Bern, Switzerland
| | - B Zuber
- Institute of Anatomy, University of Bern, Bern, Switzerland
| | - J F Deniset
- Department of Pharmacology and Physiology, University of Calgary, Calgary, Alberta, Canada.,Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Department of Microbiology, Immunology and Infectious Diseases, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Department of Cardiac Sciences, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Libin Cardiovascular Institute of Alberta, University of Calgary, Calgary, Alberta, Canada
| | - B G J Surewaard
- Department of Pharmacology and Physiology, University of Calgary, Calgary, Alberta, Canada.,Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Department of Microbiology, Immunology and Infectious Diseases, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - D Candinas
- Department of Visceral Surgery and Medicine, Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland
| | - P Kubes
- Department of Pharmacology and Physiology, University of Calgary, Calgary, Alberta, Canada. .,Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Department of Microbiology, Immunology and Infectious Diseases, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
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78
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Abstract
Liver macrophages are immune cells that under steady state conditions play important roles in maintaining tissue homeostasis. But these cells are also intricately linked to the pathogenesis of obesity-related diseases such as nonalcoholic fatty liver disease (NAFLD), nonalcoholic steatohepatitis (NASH), and type 2 diabetes (T2D). Described herein is a protocol to isolate liver macrophages by FACS for downstream molecular analysis. Such studies of macrophages are important for elucidating their role in the pathogenesis of these metabolic diseases.
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Affiliation(s)
- André Sulen
- Department of Medicine, Integrated Cardio Metabolic Center, Karolinska Institutet, Huddinge, Sweden.
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79
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Cichon I, Ortmann W, Santocki M, Opydo-Chanek M, Kolaczkowska E. Scrutinizing Mechanisms of the 'Obesity Paradox in Sepsis': Obesity Is Accompanied by Diminished Formation of Neutrophil Extracellular Traps (NETs) Due to Restricted Neutrophil-Platelet Interactions. Cells 2021; 10:384. [PMID: 33673387 PMCID: PMC7918512 DOI: 10.3390/cells10020384] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 02/03/2021] [Accepted: 02/09/2021] [Indexed: 12/12/2022] Open
Abstract
Systemic inflammation is a detrimental condition associated with high mortality. However, obese individuals seem to have higher chances of surviving sepsis. To elucidate what immunological differences exist between obese and lean individuals we studied the course of endotoxemia in mice fed high-fat diet (HFD) and ob/ob animals. Intravital microscopy revealed that neutrophil extracellular trap (NET) formation in liver vasculature is negligible in obese mice in sharp contrast to their lean counterparts (ND). Unlike in lean individuals, neutrophil influx is not driven by leptin or interleukin 33 (IL-33), nor occurs via a chemokine receptor CXCR2. In obese mice less platelets interact with neutrophils forming less aggregates. Platelets transfer from ND to HFD mice partially restores NET formation, and even further so upon P-selectin blockage on them. The study reveals that in obesity the overexaggerated inflammation and NET formation are limited during sepsis due to dysfunctional platelets suggesting their targeting as a therapeutic tool in systemic inflammation.
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Affiliation(s)
| | | | | | | | - Elzbieta Kolaczkowska
- Department of Experimental Hematology, Institute of Zoology and Biomedical Research, Jagiellonian University, 30-387 Krakow, Poland; (I.C.); (W.O.); (M.S.); (M.O.-C.)
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80
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Jorch SK, Deppermann C. Intravital Imaging Allows Organ-Specific Insights Into Immune Functions. Front Cell Dev Biol 2021; 9:623906. [PMID: 33644061 PMCID: PMC7905207 DOI: 10.3389/fcell.2021.623906] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Accepted: 01/12/2021] [Indexed: 12/24/2022] Open
Abstract
Leukocytes are among the most mobile and versatile cells that have many essential functions in homeostasis and survival. Especially cells from the innate immune system, i.e., neutrophils and macrophages, play an important role as rapid first responders against invading microorganisms. With the advent of novel imaging techniques, new ways of visualizing innate immune cells have become available in recent years, thereby enabling more and more detailed discoveries about their nature, function and interaction partners. Besides intravital spinning-disc and 2-photon microscopy, clearing and 3D-imaging techniques provide new insights into the mechanism of innate immune cell behavior in their natural environment. This mini review focuses on the contributions of novel-imaging techniques to provide insight into the functions of neutrophils and macrophages under homeostasis and in infections. Imaging setups for different organs like the liver, kidney, heart, lung, and the peritoneal cavity are discussed as well as the current limitations of these imaging techniques.
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Affiliation(s)
- Selina K Jorch
- Institute of Experimental Immunology, University Hospital of Bonn, Rheinische Friedrich-Wilhelms Universität, Bonn, Germany
| | - Carsten Deppermann
- Institute of Clinical Chemistry and Laboratory Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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81
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Chen Y, Pu Q, Ma Y, Zhang H, Ye T, Zhao C, Huang X, Ren Y, Qiao L, Liu HM, Esmon CT, Ding BS, Cao Z. Aging Reprograms the Hematopoietic-Vascular Niche to Impede Regeneration and Promote Fibrosis. Cell Metab 2021; 33:395-410.e4. [PMID: 33357457 DOI: 10.1016/j.cmet.2020.11.019] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Revised: 09/23/2020] [Accepted: 11/25/2020] [Indexed: 02/05/2023]
Abstract
Regenerative capacity is frequently impaired in aged organs. Stress to aged organs often causes scar formation (fibrosis) at the expense of regeneration. It remains to be defined how hematopoietic and vascular cells contribute to aging-induced regeneration to fibrotic transition. Here, we find that aging aberrantly reprograms the crosstalk between hematopoietic and vascular cells to impede the regenerative capacity and enhance fibrosis. In aged lung, liver, and kidney, induction of Neuropilin-1/hypoxia-inducible-factor 2α (HIF2α) suppresses anti-thrombotic and anti-inflammatory endothelial protein C receptor (EPCR) pathway, leading to formation of pro-fibrotic platelet-macrophage rosette. Activated platelets via supplying interleukin 1α synergize with endothelial-produced angiocrine chemokine to recruit fibrogenic TIMP1high macrophages. In mouse models, genetic targeting of endothelial Neuropilin-1-HIF2α, platelet interleukin 1α, or macrophage TIMP1 normalized the pro-fibrotic hematopoietic-vascular niche and restored the regenerative capacity of old organs. Targeting of aberrant endothelial node molecules might help propel "regeneration without scarring" in the repair of multiple organs.
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Affiliation(s)
- Yutian Chen
- Key Laboratory of Birth Defects of MOE, State Key Laboratory of Biotherapy, West China Second University Hospital, Sichuan University, Chengdu 610041, China
| | - Qiang Pu
- Department of Thoracic Surgery, National Frontier Center of Disease Molecular Network, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Yongyuan Ma
- Key Laboratory of Birth Defects of MOE, State Key Laboratory of Biotherapy, West China Second University Hospital, Sichuan University, Chengdu 610041, China
| | - Hua Zhang
- Key Laboratory of Birth Defects of MOE, State Key Laboratory of Biotherapy, West China Second University Hospital, Sichuan University, Chengdu 610041, China
| | - Tinghong Ye
- Key Laboratory of Birth Defects of MOE, State Key Laboratory of Biotherapy, West China Second University Hospital, Sichuan University, Chengdu 610041, China
| | - Chengjian Zhao
- Key Laboratory of Birth Defects of MOE, State Key Laboratory of Biotherapy, West China Second University Hospital, Sichuan University, Chengdu 610041, China
| | - Xiaojuan Huang
- Key Laboratory of Birth Defects of MOE, State Key Laboratory of Biotherapy, West China Second University Hospital, Sichuan University, Chengdu 610041, China
| | - Yafeng Ren
- Key Laboratory of Birth Defects of MOE, State Key Laboratory of Biotherapy, West China Second University Hospital, Sichuan University, Chengdu 610041, China
| | - Lina Qiao
- Key Laboratory of Birth Defects of MOE, State Key Laboratory of Biotherapy, West China Second University Hospital, Sichuan University, Chengdu 610041, China
| | - Han-Min Liu
- Key Laboratory of Birth Defects of MOE, State Key Laboratory of Biotherapy, West China Second University Hospital, Sichuan University, Chengdu 610041, China
| | - Charles T Esmon
- Coagulation Biology Laboratory, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104, USA
| | - Bi-Sen Ding
- Key Laboratory of Birth Defects of MOE, State Key Laboratory of Biotherapy, West China Second University Hospital, Sichuan University, Chengdu 610041, China; Fibrosis Research Center, Division of Pulmonary and Critical Care Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Division of Regenerative Medicine, Weill Cornell Medicine, New York, NY 10065, USA
| | - Zhongwei Cao
- Key Laboratory of Birth Defects of MOE, State Key Laboratory of Biotherapy, West China Second University Hospital, Sichuan University, Chengdu 610041, China.
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82
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Coenen DM, Heinzmann ACA, Karel MFA, Cosemans JMEM, Koenen RR. The multifaceted contribution of platelets in the emergence and aftermath of acute cardiovascular events. Atherosclerosis 2021; 319:132-141. [PMID: 33468314 DOI: 10.1016/j.atherosclerosis.2020.12.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Revised: 11/17/2020] [Accepted: 12/17/2020] [Indexed: 12/14/2022]
Abstract
Atherosclerosis is an underlying cause of a broad array of cardiovascular diseases characterized by plaques, arterial wall thickening initiated by hyperlipidemia, pro-inflammatory signals, endothelial dysfunction and the influx of inflammatory cells. By still incompletely characterized mechanisms, these plaques can destabilize or erode, leading to thrombosis and blood vessel occlusion and becomes clinically manifest as angina pectoris, myocardial infarction (MI) or stroke. Among the several blood cell types that are involved in the development of atherosclerosis, the role of platelets during the thrombotic occlusion of ruptured or eroded plaques is well established and clinically exploited as evident by the extensive use of platelet inhibitors. However, there is increasing evidence that platelets are also involved in the earlier stages of atheroma development by exhibiting pro-inflammatory activities. The scope of this review is to describe the role of platelets in the initiation and propagation stages of atherosclerosis and beyond; in atherothrombotic complications.
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Affiliation(s)
- Daniëlle M Coenen
- Department of Biochemistry, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, the Netherlands
| | - Alexandra C A Heinzmann
- Department of Biochemistry, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, the Netherlands
| | - Mieke F A Karel
- Department of Biochemistry, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, the Netherlands
| | - Judith M E M Cosemans
- Department of Biochemistry, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, the Netherlands
| | - Rory R Koenen
- Department of Biochemistry, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, the Netherlands.
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83
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Dineen SM, Ward JA, Leon LR. Prior viral illness increases heat stroke severity in mice. Exp Physiol 2021; 106:244-257. [PMID: 32362011 DOI: 10.1113/ep088480] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2020] [Accepted: 04/23/2020] [Indexed: 02/27/2024]
Abstract
NEW FINDINGS What is the central question of this study? We hypothesized that prior illness would increase the susceptibility to and severity of heat stroke (HS). What is the main finding and its importance? We provide the first experimental evidence, using a mouse model of HS, that recent viral illness increases the severity of HS. Our data indicate that this effect is not attributable to the exacerbation of hyperthermia but is a consequence of ongoing coagulation and systemic inflammatory reactions. Our data suggest that measurement of platelets, cytokines and chemokines before heat exposure might be indicative of susceptibility to HS, with coagulation and inflammation being potential targets for intervention that could improve recovery. ABSTRACT It is hypothesized that prior illness exacerbates heat stroke (HS) in otherwise healthy organisms by augmenting hyperthermia during heat exposure or deactivating cellular pathways that protect against organ injury. To test these hypotheses, we injected telemetered male C57BL/6J mice with lipopolysaccharide (LPS; 50 µg kg-1 i.p.) or polyinosinic:polycytidylic acid (PIC; 100 µg i.p.) as a bacterial or a viral mimic, respectively, with saline (SAL; equivalent volume) as a control. Mice recovered for 48 or 72 h before HS (maximal core temperature = 42.4°C). Platelet counts, cytokines, chemokines and organ injury were determined 48 or 72 h after injection (without heating) or at maximal core temperature and at 1 day of recovery from HS. In the absence of heat, PIC induced more robust signs of sickness and increased cytokines and chemokines (TNF-α, RANTES, IP-10 and MIP-1β) at 48 h, which was not observed with LPS (P < 0.05). Responses of both groups recovered by 72 h, although low platelet counts persisted after PIC (P < 0.05). Heat-induced hyperthermia was similar among mice injected with SAL, LPS and PIC; however, PIC-injected mice displayed more severe responses during recovery from HS, with reduced survival (48 h, 70 versus 100%; P < 0.05), deeper and longer post-HS hypothermia, greater reductions in platelets, elevated RANTES, IP-10, IL-6 and TNF-α and greater duodenal injury (P < 0.05). By 72 h, survival from HS was no longer reduced in PIC-injected mice, although hypothermia, the reduction in platelets and elevated cytokines persisted. Our data indicate that prior illness exacerbates the severity of HS in the absence of signs of illness at the time of heat exposure and suggest that this is attributable to persistent coagulation and inflammatory reactions that might be targets for intervention to improve recovery.
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Affiliation(s)
- Shauna M Dineen
- US Army Research Institute of Environmental Medicine, Thermal Mountain Medicine Division, Natick, MA, USA
| | - Jermaine A Ward
- US Army Research Institute of Environmental Medicine, Thermal Mountain Medicine Division, Natick, MA, USA
| | - Lisa R Leon
- US Army Research Institute of Environmental Medicine, Thermal Mountain Medicine Division, Natick, MA, USA
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84
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Shannon O. The role of platelets in sepsis. Res Pract Thromb Haemost 2021; 5:27-37. [PMID: 33537527 PMCID: PMC7845078 DOI: 10.1002/rth2.12465] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 10/06/2020] [Accepted: 10/30/2020] [Indexed: 12/12/2022] Open
Abstract
A State of the Art lecture titled "The role of platelets in sepsis" was presented at the ISTH congress in 2020. Sepsis is a life-threatening organ dysfunction caused by a dysregulated and multifaceted host response to infection. Platelets play a significant role in the coordinated immune response to infection and therefore in the inflammation and coagulation dysfunction that contributes to organ damage in sepsis. Thrombocytopenia has a high incidence in sepsis, and it is a marker of poor prognosis. The genesis of thrombocytopenia is likely multifactorial, and unraveling the involved molecular mechanisms will allow development of biomarkers of platelet function in sepsis. Such platelet biomarkers can facilitate study of antiplatelet interventions as immunomodulatory treatment in sepsis. Finally, relevant new data on this topic presented during the 2020 ISTH virtual congress are reviewed.
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Affiliation(s)
- Oonagh Shannon
- Division of Infection MedicineDepartment of Clinical SciencesFaculty of MedicineLund UniversityLundSweden
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85
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Ghashghaeinia M, Dreischer P, Wieder T, Köberle M. Coronavirus disease 2019 (COVID-19), human erythrocytes and the PKC-alpha/-beta inhibitor chelerythrine -possible therapeutic implication. Cell Cycle 2020; 19:3399-3405. [PMID: 33305655 PMCID: PMC7781621 DOI: 10.1080/15384101.2020.1859197] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) causes COVID-19. Until now, diverse drugs have been used for the treatment of COVID-19. These drugs are associated with severe side effects, e.g. induction of erythrocyte death, named eryptosis. This massively affects the oxygen (O2) supply of the organism. Therefore, three elementary aspects should be considered simultaneously: (1) a potential drug should directly attack the virus, (2) eliminate virus-infected host cells and (3) preserve erythrocyte survival and functionality. It is known that PKC-α inhibition enhances the vitality of human erythrocytes, while it dose-dependently activates the apoptosis machinery in nucleated cells. Thus, the use of chelerythrine as a specific PKC-alpha and -beta (PKC-α/-β) inhibitor should be a promising approach to treat people infected with SARS-CoV-2.
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Affiliation(s)
- Mehrdad Ghashghaeinia
- Psoriasis-Center, Department of Dermatology, University Medical Center Schleswig-Holstein , Kiel, Germany.,Physiologisches Institut, Abteilung für Vegetative und Klinische Physiologie, Eberhard Karls University of Tübingen , Tübingen, Germany
| | - Peter Dreischer
- Physiologisches Institut, Abteilung für Vegetative und Klinische Physiologie, Eberhard Karls University of Tübingen , Tübingen, Germany
| | - Thomas Wieder
- Physiologisches Institut, Abteilung für Vegetative und Klinische Physiologie, Eberhard Karls University of Tübingen , Tübingen, Germany
| | - Martin Köberle
- Department of Dermatology and Allergology, School of Medicine, Technical University of Munich , München, Germany
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86
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Nicolai L, Schiefelbein K, Lipsky S, Leunig A, Hoffknecht M, Pekayvaz K, Raude B, Marx C, Ehrlich A, Pircher J, Zhang Z, Saleh I, Marel AK, Löf A, Petzold T, Lorenz M, Stark K, Pick R, Rosenberger G, Weckbach L, Uhl B, Xia S, Reichel CA, Walzog B, Schulz C, Zheden V, Bender M, Li R, Massberg S, Gaertner F. Vascular surveillance by haptotactic blood platelets in inflammation and infection. Nat Commun 2020; 11:5778. [PMID: 33188196 PMCID: PMC7666582 DOI: 10.1038/s41467-020-19515-0] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Accepted: 10/14/2020] [Indexed: 12/21/2022] Open
Abstract
Breakdown of vascular barriers is a major complication of inflammatory diseases. Anucleate platelets form blood-clots during thrombosis, but also play a crucial role in inflammation. While spatio-temporal dynamics of clot formation are well characterized, the cell-biological mechanisms of platelet recruitment to inflammatory micro-environments remain incompletely understood. Here we identify Arp2/3-dependent lamellipodia formation as a prominent morphological feature of immune-responsive platelets. Platelets use lamellipodia to scan for fibrin(ogen) deposited on the inflamed vasculature and to directionally spread, to polarize and to govern haptotactic migration along gradients of the adhesive ligand. Platelet-specific abrogation of Arp2/3 interferes with haptotactic repositioning of platelets to microlesions, thus impairing vascular sealing and provoking inflammatory microbleeding. During infection, haptotaxis promotes capture of bacteria and prevents hematogenic dissemination, rendering platelets gate-keepers of the inflamed microvasculature. Consequently, these findings identify haptotaxis as a key effector function of immune-responsive platelets. Breakdown of vascular barriers is a major complication of inflammatory diseases. However, the mechanisms underlying platelet recruitment to inflammatory micro-environments remains unclear. Here, the authors identify haptotaxis as a key effector function of immune-responsive platelets
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Affiliation(s)
- Leo Nicolai
- Medizinische Klinik und Poliklinik I, Klinikum der Ludwig-Maximilians-Universität, 81377, Munich, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, 80802, Munich, Germany
| | - Karin Schiefelbein
- Medizinische Klinik und Poliklinik I, Klinikum der Ludwig-Maximilians-Universität, 81377, Munich, Germany
| | - Silvia Lipsky
- Medizinische Klinik und Poliklinik I, Klinikum der Ludwig-Maximilians-Universität, 81377, Munich, Germany
| | - Alexander Leunig
- Medizinische Klinik und Poliklinik I, Klinikum der Ludwig-Maximilians-Universität, 81377, Munich, Germany
| | - Marie Hoffknecht
- Medizinische Klinik und Poliklinik I, Klinikum der Ludwig-Maximilians-Universität, 81377, Munich, Germany
| | - Kami Pekayvaz
- Medizinische Klinik und Poliklinik I, Klinikum der Ludwig-Maximilians-Universität, 81377, Munich, Germany
| | - Ben Raude
- Medizinische Klinik und Poliklinik I, Klinikum der Ludwig-Maximilians-Universität, 81377, Munich, Germany
| | - Charlotte Marx
- Medizinische Klinik und Poliklinik I, Klinikum der Ludwig-Maximilians-Universität, 81377, Munich, Germany
| | - Andreas Ehrlich
- Medizinische Klinik und Poliklinik I, Klinikum der Ludwig-Maximilians-Universität, 81377, Munich, Germany
| | - Joachim Pircher
- Medizinische Klinik und Poliklinik I, Klinikum der Ludwig-Maximilians-Universität, 81377, Munich, Germany
| | - Zhe Zhang
- Medizinische Klinik und Poliklinik I, Klinikum der Ludwig-Maximilians-Universität, 81377, Munich, Germany
| | - Inas Saleh
- Medizinische Klinik und Poliklinik I, Klinikum der Ludwig-Maximilians-Universität, 81377, Munich, Germany
| | | | - Achim Löf
- Ludwig-Maximilians-Universität, 80799, Munich, Germany
| | - Tobias Petzold
- Medizinische Klinik und Poliklinik I, Klinikum der Ludwig-Maximilians-Universität, 81377, Munich, Germany
| | - Michael Lorenz
- Medizinische Klinik und Poliklinik I, Klinikum der Ludwig-Maximilians-Universität, 81377, Munich, Germany
| | - Konstantin Stark
- Medizinische Klinik und Poliklinik I, Klinikum der Ludwig-Maximilians-Universität, 81377, Munich, Germany
| | - Robert Pick
- Walter-Brendel-Centre of Experimental Medicine, University Hospital, München, Germany.,Institute of Cardiovascular Physiology and Pathophysiology, Biomedical Center, Planegg-Martinsried, Munich, Germany
| | - Gerhild Rosenberger
- Medizinische Klinik und Poliklinik I, Klinikum der Ludwig-Maximilians-Universität, 81377, Munich, Germany
| | - Ludwig Weckbach
- Medizinische Klinik und Poliklinik I, Klinikum der Ludwig-Maximilians-Universität, 81377, Munich, Germany
| | - Bernd Uhl
- Department of Otorhinolarynology, Ludwig-Maximilians-Universität Munich, Munich, Germany
| | - Sheng Xia
- Department of Cell Biology, Johns Hopkins University School of Medicine, 855 North Wolfe Street, Baltimore, MD, 21205, USA
| | | | - Barbara Walzog
- Walter-Brendel-Centre of Experimental Medicine, University Hospital, München, Germany.,Institute of Cardiovascular Physiology and Pathophysiology, Biomedical Center, Planegg-Martinsried, Munich, Germany
| | - Christian Schulz
- Medizinische Klinik und Poliklinik I, Klinikum der Ludwig-Maximilians-Universität, 81377, Munich, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, 80802, Munich, Germany
| | - Vanessa Zheden
- Institute of Science and Technology (IST) Austria, 3400, Klosterneuburg, Austria
| | - Markus Bender
- Institute of Experimental Biomedicine I, University Hospital and Rudolf Virchow Center, Würzburg, Germany
| | - Rong Li
- Department of Cell Biology, Johns Hopkins University School of Medicine, 855 North Wolfe Street, Baltimore, MD, 21205, USA
| | - Steffen Massberg
- Medizinische Klinik und Poliklinik I, Klinikum der Ludwig-Maximilians-Universität, 81377, Munich, Germany. .,DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, 80802, Munich, Germany.
| | - Florian Gaertner
- DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, 80802, Munich, Germany. .,Institute of Science and Technology (IST) Austria, 3400, Klosterneuburg, Austria.
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87
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Deppermann C, Kratofil RM, Peiseler M, David BA, Zindel J, Castanheira FVES, van der Wal F, Carestia A, Jenne CN, Marth JD, Kubes P. Macrophage galactose lectin is critical for Kupffer cells to clear aged platelets. J Exp Med 2020; 217:133651. [PMID: 31978220 PMCID: PMC7144524 DOI: 10.1084/jem.20190723] [Citation(s) in RCA: 83] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Revised: 10/01/2019] [Accepted: 12/17/2019] [Indexed: 12/21/2022] Open
Abstract
Every day, megakaryocytes produce billions of platelets that circulate for several days and eventually are cleared by the liver. The exact removal mechanism, however, remains unclear. Loss of sialic acid residues is thought to feature in the aging and clearance of platelets. Using state-of-the-art spinning disk intravital microscopy to delineate the different compartments and cells of the mouse liver, we observed rapid accumulation of desialylated platelets predominantly on Kupffer cells, with only a few on endothelial cells and none on hepatocytes. Kupffer cell depletion prevented the removal of aged platelets from circulation. Ashwell-Morell receptor (AMR) deficiency alone had little effect on platelet uptake. Macrophage galactose lectin (MGL) together with AMR mediated clearance of desialylated or cold-stored platelets by Kupffer cells. Effective clearance is critical, as mice with an aged platelet population displayed a bleeding phenotype. Our data provide evidence that the MGL of Kupffer cells plays a significant role in the removal of desialylated platelets through a collaboration with the AMR, thereby maintaining a healthy and functional platelet compartment.
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Affiliation(s)
- Carsten Deppermann
- Department of Physiology and Pharmacology, University of Calgary, Calgary, Alberta, Canada.,Calvin, Phoebe and Joan Snyder Institute for Chronic Diseases, University of Calgary, Calgary, Alberta, Canada.,Institute of Clinical Chemistry and Laboratory Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Rachel M Kratofil
- Department of Physiology and Pharmacology, University of Calgary, Calgary, Alberta, Canada.,Calvin, Phoebe and Joan Snyder Institute for Chronic Diseases, University of Calgary, Calgary, Alberta, Canada
| | - Moritz Peiseler
- Department of Physiology and Pharmacology, University of Calgary, Calgary, Alberta, Canada.,Calvin, Phoebe and Joan Snyder Institute for Chronic Diseases, University of Calgary, Calgary, Alberta, Canada
| | - Bruna A David
- Department of Physiology and Pharmacology, University of Calgary, Calgary, Alberta, Canada.,Calvin, Phoebe and Joan Snyder Institute for Chronic Diseases, University of Calgary, Calgary, Alberta, Canada
| | - Joel Zindel
- Department of Physiology and Pharmacology, University of Calgary, Calgary, Alberta, Canada.,Calvin, Phoebe and Joan Snyder Institute for Chronic Diseases, University of Calgary, Calgary, Alberta, Canada
| | - Fernanda Vargas E Silva Castanheira
- Department of Physiology and Pharmacology, University of Calgary, Calgary, Alberta, Canada.,Calvin, Phoebe and Joan Snyder Institute for Chronic Diseases, University of Calgary, Calgary, Alberta, Canada
| | - Fardau van der Wal
- Department of Physiology and Pharmacology, University of Calgary, Calgary, Alberta, Canada.,Calvin, Phoebe and Joan Snyder Institute for Chronic Diseases, University of Calgary, Calgary, Alberta, Canada
| | - Agostina Carestia
- Calvin, Phoebe and Joan Snyder Institute for Chronic Diseases, University of Calgary, Calgary, Alberta, Canada.,Department of Microbiology, Immunology and Infectious Diseases, University of Calgary, Calgary, Alberta, Canada
| | - Craig N Jenne
- Calvin, Phoebe and Joan Snyder Institute for Chronic Diseases, University of Calgary, Calgary, Alberta, Canada.,Department of Microbiology, Immunology and Infectious Diseases, University of Calgary, Calgary, Alberta, Canada
| | - Jamey D Marth
- Center for Nanomedicine, SBP Medical Discovery Institute, and Department of Molecular, Cellular, and Developmental Biology, University of California, Santa Barbara, Santa Barbara, CA
| | - Paul Kubes
- Department of Physiology and Pharmacology, University of Calgary, Calgary, Alberta, Canada.,Calvin, Phoebe and Joan Snyder Institute for Chronic Diseases, University of Calgary, Calgary, Alberta, Canada
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88
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Davis RP, Almishri W, Jenne CN, Swain MG. The Antidepressant Mirtazapine Activates Hepatic Macrophages, Facilitating Pathogen Clearance While Limiting Tissue Damage in Mice. Front Immunol 2020; 11:578654. [PMID: 33250892 PMCID: PMC7673391 DOI: 10.3389/fimmu.2020.578654] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Accepted: 10/12/2020] [Indexed: 12/21/2022] Open
Abstract
Background and Aims Mirtazapine is an atypical antidepressant with antagonist activity for serotonin and histamine receptors. Clinical and experimental evidence suggests that, in addition to treating depression, mirtazapine also alters liver innate immunity and suppresses immune-driven hepatic macrophage activation. Liver macrophages, Kupffer cells, represent the largest collection of fixed macrophages in the body and are critical in regulating hepatic immunity. In addition to their capacity to regulate inflammation, Kupffer cells are key sentinels for clearing blood-borne pathogens, preventing their dissemination within the body. This process involves pathogen capture, phagocytosis, and activation-induced killing via reactive oxygen species (ROS) production. Therefore, we speculated that mirtazapine might adversely alter Kupffer cell pathogen-associated activation and killing. Methods Mice were treated with mirtazapine and time-dependent changes in Kupffer cells were characterized using intravital microscopy. Macrophage and neutrophil responses, bacterial dissemination, and liver damage were assessed following i.v. infection with a pathogenic strain of S. aureus. Results Mirtazapine rapidly (within 1.5 h) activates Kupffer cells, indicated by a loss of elongated shape with cellular rounding. However, this shape change did not result in impaired pathogen capture function, and, in fact, generated enhanced ROS production in response to S. aureus-induced sepsis. Neutrophil dynamics were altered with reduced cellular recruitment to the liver following infection. Bacterial dissemination post-intravenous administration was not altered by mirtazapine treatment; however, hepatic abscess formation was significantly reduced. Conclusions Mirtazapine rapidly activates Kupffer cells, associated with preserved bacterial capture functions and enhanced ROS generation capacity. Moreover, these changes in Kupffer cells were linked to a beneficial reduction in hepatic abscess size. In contrast to our initial speculation, mirtazapine may have beneficial effects in sepsis and warrants further exploration.
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Affiliation(s)
- Rachelle Paige Davis
- Department of Microbiology, Immunology, and Infectious Diseases, University of Calgary, Calgary, AB, Canada.,Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB, Canada
| | - Wagdi Almishri
- Department of Microbiology, Immunology, and Infectious Diseases, University of Calgary, Calgary, AB, Canada.,Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB, Canada
| | - Craig Neal Jenne
- Department of Microbiology, Immunology, and Infectious Diseases, University of Calgary, Calgary, AB, Canada.,Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB, Canada
| | - Mark Gordon Swain
- Department of Microbiology, Immunology, and Infectious Diseases, University of Calgary, Calgary, AB, Canada.,Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB, Canada
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89
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Acetylsalicylic acid inhibits intravascular coagulation during Staphylococcus aureus-induced sepsis in mice. Blood 2020; 135:1281-1286. [PMID: 31951648 DOI: 10.1182/blood.2019002783] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Accepted: 01/05/2020] [Indexed: 12/19/2022] Open
Abstract
Antiplatelet therapies have been proposed for the treatment of sepsis, a syndrome resulting from a dysregulated immune response and inappropriate activation of coagulation. Acetylsalicylic acid (ASA) may serve as a potential therapeutic strategy to prevent infection-induced coagulopathy and associated tissue damage. Using intravital microscopy, we found that Staphylococcus aureus infection induced neutrophil recruitment, platelet aggregation, and neutrophil extracellular trap (NET) release in the liver. Mice pretreated with ASA, or animals receiving ASA 3 hours postinfection, had significantly reduced platelet aggregation and NET release. Additionally, ASA-treated mice had reduced intravascular thrombin activity and microvascular occlusion as compared with untreated S aureus-infected mice. This inhibition of coagulation was accompanied by decreased levels of alanine aminotransferase and aspartate aminotransferase in the plasma, indicating less liver damage. Finally, bacterial loads (colony-forming units per milliliter) in liver, lung, and spleen were not different between groups, and the phagocytic capacity of Kupffer cells was preserved following ASA treatment. These results suggest that ASA may serve as a therapeutic approach to sepsis through its ability to reduce the deleterious action of immunothrombi while maintaining innate immune functions.
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90
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Bray MA, Sartain SE, Gollamudi J, Rumbaut RE. Microvascular thrombosis: experimental and clinical implications. Transl Res 2020; 225:105-130. [PMID: 32454092 PMCID: PMC7245314 DOI: 10.1016/j.trsl.2020.05.006] [Citation(s) in RCA: 55] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 05/12/2020] [Accepted: 05/17/2020] [Indexed: 02/07/2023]
Abstract
A significant amount of clinical and research interest in thrombosis is focused on large vessels (eg, stroke, myocardial infarction, deep venous thrombosis, etc.); however, thrombosis is often present in the microcirculation in a variety of significant human diseases, such as disseminated intravascular coagulation, thrombotic microangiopathy, sickle cell disease, and others. Further, microvascular thrombosis has recently been demonstrated in patients with COVID-19, and has been proposed to mediate the pathogenesis of organ injury in this disease. In many of these conditions, microvascular thrombosis is accompanied by inflammation, an association referred to as thromboinflammation. In this review, we discuss endogenous regulatory mechanisms that prevent thrombosis in the microcirculation, experimental approaches to induce microvascular thrombi, and clinical conditions associated with microvascular thrombosis. A greater understanding of the links between inflammation and thrombosis in the microcirculation is anticipated to provide optimal therapeutic targets for patients with diseases accompanied by microvascular thrombosis.
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Key Words
- adamts13, a disintegrin-like and metalloproteinase with thrombospondin type 1 motif 13
- ap, alternate pathway
- apc, activated protein c
- aps, antiphospholipid syndrome
- caps, catastrophic aps
- asfa, american society for apheresis
- atp, adenosine triphosphate
- cfh, complement factor h
- con a, concavalin a
- cox, cyclooxygenase
- damp, damage-associated molecular pattern
- dic, disseminated intravascular coagulation
- gbm, glomerular basement membrane
- hellp, hemolysis, elevated liver enzymes, low platelets
- hitt, heparin-induced thrombocytopenia and thrombosis
- hlh, hemophagocytic lymphohistiocytosis
- hus, hemolytic-uremic syndrome
- isth, international society for thrombosis and haemostasis
- ivig, intravenous immunoglobulin
- ldh, lactate nos, nitric oxide synthase
- net, neutrophil extracellular trap
- pai-1, plasminogen activator inhibitor 1
- pf4, platelet factor 4
- prr, pattern recognition receptor
- rbc, red blood cell
- scd, sickle cell disease
- sle, systemic lupus erythematosus
- tlr, toll-like receptor
- tf, tissue factor
- tfpi, tissue factor pathway inhibitor
- tma, thrombotic microangiopathy
- tnf-α, tumor necrosis factor-α
- tpe, therapeutic plasma exchange
- ulc, ultra large heparin-pf4 complexes
- ulvwf, ultra-large von willebrand factor
- vwf, von willebrand factor
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Affiliation(s)
- Monica A Bray
- Center for Translational Research on Inflammatory Diseases (CTRID), Michael E. DeBakey VA Medical Center, Houston, Texas; Baylor College of Medicine, Houston, Texas
| | - Sarah E Sartain
- Center for Translational Research on Inflammatory Diseases (CTRID), Michael E. DeBakey VA Medical Center, Houston, Texas; Baylor College of Medicine, Houston, Texas
| | - Jahnavi Gollamudi
- Center for Translational Research on Inflammatory Diseases (CTRID), Michael E. DeBakey VA Medical Center, Houston, Texas; Baylor College of Medicine, Houston, Texas
| | - Rolando E Rumbaut
- Center for Translational Research on Inflammatory Diseases (CTRID), Michael E. DeBakey VA Medical Center, Houston, Texas; Baylor College of Medicine, Houston, Texas.
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91
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Portier I, Campbell RA. Role of Platelets in Detection and Regulation of Infection. Arterioscler Thromb Vasc Biol 2020; 41:70-78. [PMID: 33115274 DOI: 10.1161/atvbaha.120.314645] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Platelets are classically known as essential mediators of hemostasis and thrombosis. However, in recent years, platelets have gained recognition for their inflammatory functions, which modulate the immune response during infectious diseases. Platelets contain various immunoreceptors that enable them to act as sentinels to recognize intravascular pathogens. Upon activation, platelets directly limit pathogen growth through the release of AMPs (antimicrobial proteins) and ensure pathogen clearance through activation of immune cells. However, aberrant platelet activation can lead to inflammation and thrombotic events.
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Affiliation(s)
- Irina Portier
- University of Utah Molecular Medicine Program, Salt Lake City (I.P., R.A.C.)
| | - Robert A Campbell
- University of Utah Molecular Medicine Program, Salt Lake City (I.P., R.A.C.).,Department of Internal Medicine, University of Utah, Salt Lake City (R.A.C.)
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92
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Otaka F, Ito Y, Goto T, Eshima K, Amano H, Koizumi W, Majima M. Platelets prevent the development of monocrotaline-induced liver injury in mice. Toxicol Lett 2020; 335:71-81. [PMID: 33122006 DOI: 10.1016/j.toxlet.2020.10.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 10/05/2020] [Accepted: 10/16/2020] [Indexed: 12/28/2022]
Abstract
Destruction of liver sinusoidal endothelial cells (LSECs) is an initial event in sinusoidal obstruction syndrome (SOS) that leads to accumulation of platelets in the liver. Herein, we explored the role of platelets during progression of experimental SOS induced by monocrotaline (MCT) in mice. Depletion of platelets using an anti-CD41 antibody or anti-thrombocyte serum exacerbated MCT-induced liver injury in C57BL/6 mice, as indicated by an increase in the alanine transaminase (ALT) level, which was associated with hemorrhagic necrosis. Thrombocytosis induced by thrombopoietin (TPO) or the TPO receptor agonist romiplostim (ROM) attenuated MCT-induced liver injury, as evidenced by lower levels of ALT and mRNA encoding matrix metalloproteinase (MMP) 9, and higher levels of mRNA encoding vascular endothelial growth factor receptor (VEGFR) 2 and VEGFR3. The level of activated hepatic platelets was higher in TPO- and ROM-treated mice than in saline-treated mice. Co-culture with a high number of platelets increased the viability of LSECs and their mRNA levels of CD31, VEGFR2, and VEGFR3, and decreased their mRNA level of MMP9. The level of VEGF-A was increased in the culture medium of LSECs co-cultured with platelets. These results indicate that platelets attenuate MCT-induced liver injury by minimizing damage to LSECs.
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Affiliation(s)
- Fumisato Otaka
- Department of Molecular Pharmacology, Graduate School of Medical Sciences, Kitasato University, Sagamihara, Kanagawa 252-0374, Japan; Departments of Pharmacology, Kitasato University School of Medicine, Sagamihara, Kanagawa 252-0374, Japan; Departments of Gastroenterology, Kitasato University School of Medicine, Sagamihara, Kanagawa 252-0374, Japan
| | - Yoshiya Ito
- Department of Molecular Pharmacology, Graduate School of Medical Sciences, Kitasato University, Sagamihara, Kanagawa 252-0374, Japan; Departments of Pharmacology, Kitasato University School of Medicine, Sagamihara, Kanagawa 252-0374, Japan.
| | - Takuya Goto
- Department of Molecular Pharmacology, Graduate School of Medical Sciences, Kitasato University, Sagamihara, Kanagawa 252-0374, Japan
| | - Koji Eshima
- Departments of Immunology, Kitasato University School of Medicine, Sagamihara, Kanagawa 252-0374, Japan
| | - Hideki Amano
- Department of Molecular Pharmacology, Graduate School of Medical Sciences, Kitasato University, Sagamihara, Kanagawa 252-0374, Japan; Departments of Pharmacology, Kitasato University School of Medicine, Sagamihara, Kanagawa 252-0374, Japan
| | - Wasaburo Koizumi
- Departments of Gastroenterology, Kitasato University School of Medicine, Sagamihara, Kanagawa 252-0374, Japan
| | - Masataka Majima
- Department of Molecular Pharmacology, Graduate School of Medical Sciences, Kitasato University, Sagamihara, Kanagawa 252-0374, Japan; Departments of Pharmacology, Kitasato University School of Medicine, Sagamihara, Kanagawa 252-0374, Japan; Department of Medical Therapeutics, Kanagawa Institute of Technology, Atsugi, Kanagawa 243-0292, Japan
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93
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Sun J, Zhang J, Wang X, Ji F, Ronco C, Tian J, Yin Y. Gut-liver crosstalk in sepsis-induced liver injury. CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2020; 24:614. [PMID: 33076940 PMCID: PMC7574296 DOI: 10.1186/s13054-020-03327-1] [Citation(s) in RCA: 80] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/08/2020] [Accepted: 10/05/2020] [Indexed: 02/07/2023]
Abstract
Sepsis is characterized by a dysregulated immune response to infection leading to life-threatening organ dysfunction. Sepsis-induced liver injury is recognized as a powerful independent predictor of mortality in the intensive care unit. During systemic infections, the liver regulates immune defenses via bacterial clearance, production of acute-phase proteins (APPs) and cytokines, and metabolic adaptation to inflammation. Increased levels of inflammatory cytokines and impaired bacterial clearance and disrupted metabolic products can cause gut microbiota dysbiosis and disruption of the intestinal mucosal barrier. Changes in the gut microbiota play crucial roles in liver injury during sepsis. Bacterial translocation and resulting intestinal inflammation lead to a systemic inflammatory response and acute liver injury. The gut-liver crosstalk is a potential target for therapeutic interventions. This review analyzes the underlying mechanisms for the gut-liver crosstalk in sepsis-induced liver injury.
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Affiliation(s)
- Jian Sun
- Department of Emergency and Critical Care Medicine, Second Hospital of Jilin University, Changchun, Jilin Province, China.,International Renal Research Institute of Vicenza (IRRIV), Vicenza, Italy
| | - Jingxiao Zhang
- Department of Emergency and Critical Care Medicine, Second Hospital of Jilin University, Changchun, Jilin Province, China.,International Renal Research Institute of Vicenza (IRRIV), Vicenza, Italy
| | - Xiangfeng Wang
- Department of Pharmacy, First Hospital of Jilin University, Changchun, Jilin Province, China
| | - Fuxi Ji
- Department of Emergency and Critical Care Medicine, Second Hospital of Jilin University, Changchun, Jilin Province, China
| | - Claudio Ronco
- International Renal Research Institute of Vicenza (IRRIV), Vicenza, Italy.,Department of Nephrology, Dialysis and Transplantation, San Bortolo Hospital, Vicenza, Italy
| | - Jiakun Tian
- Department of Emergency and Critical Care Medicine, Second Hospital of Jilin University, Changchun, Jilin Province, China.
| | - Yongjie Yin
- Department of Emergency and Critical Care Medicine, Second Hospital of Jilin University, Changchun, Jilin Province, China.
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94
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Li L, Zeng Z. Live Imaging of Innate and Adaptive Immune Responses in the Liver. Front Immunol 2020; 11:564768. [PMID: 33042143 PMCID: PMC7527534 DOI: 10.3389/fimmu.2020.564768] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Accepted: 08/13/2020] [Indexed: 12/21/2022] Open
Abstract
Immune response in the liver is determined by the spatial organization and cellular dynamics of hepatic immune cells. The liver vasculature accommodates abundant tissue-resident innate immune cells, such as Kupffer cells, natural killer cells, and natural killer T cells, to ensure efficient intravascular immunosurveillance. The fenestrated sinusoids also allow direct contact between circulating T cells and non-canonical antigen-presenting cells, such as hepatocytes, to instruct adaptive immune responses. Distinct cellular behaviors are exploited by liver immune cells to exert proper functions. Intravital imaging enables real-time visualization of individual immune cell in living animals, representing a powerful tool in dissecting the spatiotemporal features of intrahepatic immune cells during steady state and liver diseases. This review summarizes current advances in liver immunology prompted by in vivo imaging, with a particular focus on liver-resident innate immune cells and hepatic T cells.
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Affiliation(s)
- Lu Li
- The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China.,Hefei National Laboratory for Physical Sciences at Microscale, The CAS Key Laboratory of Innate Immunity and Chronic Disease, School of Basic Medical Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Zhutian Zeng
- The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China.,Hefei National Laboratory for Physical Sciences at Microscale, The CAS Key Laboratory of Innate Immunity and Chronic Disease, School of Basic Medical Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
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95
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Wen Y, Lambrecht J, Ju C, Tacke F. Hepatic macrophages in liver homeostasis and diseases-diversity, plasticity and therapeutic opportunities. Cell Mol Immunol 2020; 18:45-56. [PMID: 33041338 DOI: 10.1038/s41423-020-00558-8] [Citation(s) in RCA: 294] [Impact Index Per Article: 73.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Accepted: 09/14/2020] [Indexed: 02/06/2023] Open
Abstract
Macrophages, which are key cellular components of the liver, have emerged as essential players in the maintenance of hepatic homeostasis and in injury and repair processes in acute and chronic liver diseases. Upon liver injury, resident Kupffer cells (KCs) sense disturbances in homeostasis, interact with hepatic cell populations and release chemokines to recruit circulating leukocytes, including monocytes, which subsequently differentiate into monocyte-derived macrophages (MoMϕs) in the liver. Both KCs and MoMϕs contribute to both the progression and resolution of tissue inflammation and injury in various liver diseases. The diversity of hepatic macrophage subsets and their plasticity explain their different functional responses in distinct liver diseases. In this review, we highlight novel findings regarding the origins and functions of hepatic macrophages and discuss the potential of targeting macrophages as a therapeutic strategy for liver disease.
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Affiliation(s)
- Yankai Wen
- Department of Anesthesiology, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Joeri Lambrecht
- Department of Hepatology and Gastroenterology, Charité University Medicine Berlin, Berlin, Germany
| | - Cynthia Ju
- Department of Anesthesiology, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, TX, USA.
| | - Frank Tacke
- Department of Hepatology and Gastroenterology, Charité University Medicine Berlin, Berlin, Germany.
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96
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Shi C, Yang L, Braun A, Anders HJ. Extracellular DNA-A Danger Signal Triggering Immunothrombosis. Front Immunol 2020; 11:568513. [PMID: 33117353 PMCID: PMC7575749 DOI: 10.3389/fimmu.2020.568513] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Accepted: 09/09/2020] [Indexed: 12/14/2022] Open
Abstract
Clotting and inflammation are effective danger response patterns positively selected by evolution to limit fatal bleeding and pathogen invasion upon traumatic injuries. As a trade-off, thrombotic, and thromboembolic events complicate severe forms of infectious and non-infectious states of acute and chronic inflammation, i.e., immunothrombosis. Factors linked to thrombosis and inflammation include mediators released by platelet granules, complement, and lipid mediators and certain integrins. Extracellular deoxyribonucleic acid (DNA) was a previously unrecognized cellular component in the blood, which elicits profound proinflammatory and prothrombotic effects. Pathogens trigger the release of extracellular DNA together with other pathogen-associated molecular patterns. Dying cells in the inflamed or infected tissue release extracellular DNA together with other danger associated molecular pattern (DAMPs). Neutrophils release DNA by forming neutrophil extracellular traps (NETs) during infection, trauma or other forms of vascular injury. Fluorescence tissue imaging localized extracellular DNA to sites of injury and to intravascular thrombi. Functional studies using deoxyribonuclease (DNase)-deficient mouse strains or recombinant DNase show that extracellular DNA contributes to the process of immunothrombosis. Here, we review rodent models of immunothrombosis and the evolving evidence for extracellular DNA as a driver of immunothrombosis and discuss challenges and prospects for extracellular DNA as a potential therapeutic target.
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Affiliation(s)
- Chongxu Shi
- Renal Division, Medizinische Klinik und Poliklinik IV, Klinikum der Universität München, Ludwig-Maximilians University Munich, Munich, Germany
| | - Luying Yang
- Renal Division, Medizinische Klinik und Poliklinik IV, Klinikum der Universität München, Ludwig-Maximilians University Munich, Munich, Germany
| | - Attila Braun
- German Center for Lung Research, Walther-Straub-Institute for Pharmacology and Toxicology, Ludwig-Maximilians University Munich, Munich, Germany
| | - Hans-Joachim Anders
- Renal Division, Medizinische Klinik und Poliklinik IV, Klinikum der Universität München, Ludwig-Maximilians University Munich, Munich, Germany
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97
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Santecchia I, Ferrer MF, Vieira ML, Gómez RM, Werts C. Phagocyte Escape of Leptospira: The Role of TLRs and NLRs. Front Immunol 2020; 11:571816. [PMID: 33123147 PMCID: PMC7573490 DOI: 10.3389/fimmu.2020.571816] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Accepted: 09/16/2020] [Indexed: 12/21/2022] Open
Abstract
The spirochetal bacteria Leptospira spp. are causative agents of leptospirosis, a globally neglected and reemerging zoonotic disease. Infection with these pathogens may lead to an acute and potentially fatal disease but also to chronic asymptomatic renal colonization. Both forms of disease demonstrate the ability of leptospires to evade the immune response of their hosts. In this review, we aim first to recapitulate the knowledge and explore the controversial data about the opsonization, recognition, intracellular survival, and killing of leptospires by scavenger cells, including platelets, neutrophils, macrophages, and dendritic cells. Second, we will summarize the known specificities of the recognition or escape of leptospire components (the so-called microbial-associated molecular patterns; MAMPs) by the pattern recognition receptors (PRRs) of the Toll-like and NOD-like families. These PRRs are expressed by phagocytes, and their stimulation by MAMPs triggers pro-inflammatory cytokine and chemokine production and bactericidal responses, such as antimicrobial peptide secretion and reactive oxygen species production. Finally, we will highlight recent studies suggesting that boosting or restoring phagocytic functions by treatments using agonists of the Toll-like or NOD receptors represents a novel prophylactic strategy and describe other potential therapeutic or vaccine strategies to combat leptospirosis.
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Affiliation(s)
- Ignacio Santecchia
- Institut Pasteur, Microbiology Department, Unité Biologie et Génétique de la Paroi Bactérienne, Paris, France
- CNRS, UMR 2001 Microbiologie intégrative et Moléculaire, Paris, France
- INSERM, Equipe Avenir, Paris, France
- Université de Paris, Sorbonne Paris Cité, Paris, France
| | - María Florencia Ferrer
- Laboratorio de Virus Animales, Instituto de Biotecnología y Biología Molecular, CONICET-Universidad Nacional de La Plata, La Plata, Argentina
| | - Monica Larucci Vieira
- Departamento de Microbiologia, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, Brazil
| | - Ricardo Martín Gómez
- Laboratorio de Virus Animales, Instituto de Biotecnología y Biología Molecular, CONICET-Universidad Nacional de La Plata, La Plata, Argentina
| | - Catherine Werts
- Institut Pasteur, Microbiology Department, Unité Biologie et Génétique de la Paroi Bactérienne, Paris, France
- CNRS, UMR 2001 Microbiologie intégrative et Moléculaire, Paris, France
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98
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Zeeuw van der Laan EA, van der Velden S, Porcelijn L, Semple JW, van der Schoot CE, Kapur R. Evaluation of Platelet Responses in Transfusion-Related Acute Lung Injury (TRALI). Transfus Med Rev 2020; 34:227-233. [PMID: 33036839 PMCID: PMC7493815 DOI: 10.1016/j.tmrv.2020.08.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Revised: 08/19/2020] [Accepted: 08/20/2020] [Indexed: 12/29/2022]
Abstract
Platelets are versatile cells which are capable of eliciting nonhemostatic immune functions, especially under inflammatory conditions. Depending on the specific setting, platelets may be either protective or pathogenic in acute lung injury and acute respiratory distress syndrome (ARDS). Their role in transfusion-related acute lung injury (TRALI) is less well defined; however, it has been hypothesized that recipient platelets and transfused platelets both play a pathogenic role in TRALI. Overall, despite conflicting findings, it appears that recipient platelets may play a pathogenic role in antibody-mediated TRALI; however, their contribution appears to be limited. It is imperative to first validate the involvement of recipient platelets by standardizing the animal models, methods, reagents, and readouts for lung injury and taking the animal housing environment into consideration. For the involvement of transfused platelets in TRALI, it appears that predominantly lipids such as ceramide in stored platelets are able to induce TRALI in animal models. These studies will also need to be validated, and moreover, the platelet-derived lipid-mediated mechanisms leading to TRALI will need to be investigated.
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Affiliation(s)
- Eveline A.N. Zeeuw van der Laan
- Sanquin Research, Department of Experimental Immunohematology, Amsterdam and Landsteiner Laboratory, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands
| | - Saskia van der Velden
- Sanquin Research, Department of Experimental Immunohematology, Amsterdam and Landsteiner Laboratory, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands
| | - Leendert Porcelijn
- Department of Immunohematology Diagnostics, Sanquin Diagnostic Services, Amsterdam, the Netherlands
| | - John W. Semple
- Division of Hematology and Transfusion Medicine, Lund University, Lund, Sweden
| | - C. Ellen van der Schoot
- Sanquin Research, Department of Experimental Immunohematology, Amsterdam and Landsteiner Laboratory, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands
| | - Rick Kapur
- Sanquin Research, Department of Experimental Immunohematology, Amsterdam and Landsteiner Laboratory, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands.
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99
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Abstract
Platelets are increasingly being recognized for playing roles beyond thrombosis and hemostasis. Today we know that they mediate inflammation by direct interactions with innate immune cells or secretion of cytokines/chemokines. Here we review their interactions with neutrophils and monocytes/macrophages in infection and sepsis, stroke, myocardial infarction and venous thromboembolism. We discuss new roles for platelet surface receptors like GPVI or GPIb and also look at platelet contributions to the formation of neutrophil extracellular traps (NETs) as well as to deep vein thrombosis during infection, e.g. in COVID-19 patients.
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Affiliation(s)
- Kimberly Martinod
- Center for Molecular and Vascular Biology, Department of Cardiovascular Sciences, KU Leuven, Belgium
| | - Carsten Deppermann
- Institute of Clinical Chemistry and Laboratory Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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100
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Platelets Promote Macrophage Polarization toward Pro-inflammatory Phenotype and Increase Survival of Septic Mice. Cell Rep 2020; 28:896-908.e5. [PMID: 31340152 DOI: 10.1016/j.celrep.2019.06.062] [Citation(s) in RCA: 94] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 02/28/2019] [Accepted: 06/17/2019] [Indexed: 12/21/2022] Open
Abstract
We investigated the contribution of human platelets to macrophage effector properties in the presence of lipopolysaccharide (LPS), as well as the beneficial effects and time frame for platelet transfusion in septic animals. Our results show that platelets sequester both pro-(TNF-α/IL-6) and anti-(IL-10) inflammatory cytokines released by monocytes. Low LPS concentrations (0.01 ng/mL) induced M2 macrophage polarization by decreasing CD64 and augmenting CD206 and CD163 expression; yet, the presence of platelets skewed monocytes toward type 1 macrophage (M1) phenotype in a cell-contact-dependent manner by the glycoprotein Ib (GPIb)-CD11b axis. Accordingly, platelet-licensed macrophages showed increased TNF-α levels, bacterial phagocytic activity, and a reduced healing capability. Platelet transfusion increased inducible nitric oxide synthase (iNOS)+ macrophages, improving bacterial clearance and survival rates in septic mice up to 6 h post-infection, an effect that was abolished by CD11b and GPIb blockade. Our results demonstrate that platelets orchestrate macrophage effector responses, improving the clinical outcome of sepsis in a narrow but relevant time frame.
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