1
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Ross JT, Robles AJ, Mazer MB, Studer AC, Remy KE, Callcut RA. Cell-Free Hemoglobin in the Pathophysiology of Trauma: A Scoping Review. Crit Care Explor 2024; 6:e1052. [PMID: 38352942 PMCID: PMC10863949 DOI: 10.1097/cce.0000000000001052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2024] Open
Abstract
OBJECTIVES Cell-free hemoglobin (CFH) is a potent mediator of endothelial dysfunction, organ injury, coagulopathy, and immunomodulation in hemolysis. These mechanisms have been demonstrated in patients with sepsis, hemoglobinopathies, and those receiving transfusions. However, less is known about the role of CFH in the pathophysiology of trauma, despite the release of equivalent levels of free hemoglobin. DATA SOURCES Ovid MEDLINE, Embase, Web of Science Core Collection, and BIOSIS Previews were searched up to January 21, 2023, using key terms related to free hemoglobin and trauma. DATA EXTRACTION Two independent reviewers selected studies focused on hemolysis in trauma patients, hemoglobin breakdown products, hemoglobin-mediated injury in trauma, transfusion, sepsis, or therapeutics. DATA SYNTHESIS Data from the selected studies and their references were synthesized into a narrative review. CONCLUSIONS Free hemoglobin likely plays a role in endothelial dysfunction, organ injury, coagulopathy, and immune dysfunction in polytrauma. This is a compelling area of investigation as multiple existing therapeutics effectively block these pathways.
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Affiliation(s)
- James T Ross
- Department of Surgery, University of California Davis, Sacramento, CA
- The Blood, Heart, Lung, and Immunology Research Center, Case Western Reserve University, University Hospitals Cleveland, Cleveland, OH
| | - Anamaria J Robles
- Department of Surgery, University of California Davis, Sacramento, CA
| | - Monty B Mazer
- The Blood, Heart, Lung, and Immunology Research Center, Case Western Reserve University, University Hospitals Cleveland, Cleveland, OH
- Division of Pediatric Critical Care Medicine, Department of Pediatrics, UH Rainbow Babies and Children's Hospital, Cleveland, OH
| | - Amy C Studer
- Blaisdell Medical Library, University of California Davis, Sacramento, CA
| | - Kenneth E Remy
- The Blood, Heart, Lung, and Immunology Research Center, Case Western Reserve University, University Hospitals Cleveland, Cleveland, OH
- Division of Pulmonary Critical Care Medicine, Department of Medicine, University Hospitals of Cleveland, Case Western Reserve School of Medicine, Cleveland, OH
| | - Rachael A Callcut
- Department of Surgery, University of California Davis, Sacramento, CA
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2
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Liu Y, Su S, Shayo S, Bao W, Pal M, Dou K, Shi PA, Aygun B, Campbell-Lee S, Lobo CA, Mendelson A, An X, Manwani D, Zhong H, Yazdanbakhsh K. Hemolysis dictates monocyte differentiation via two distinct pathways in sickle cell disease vaso-occlusion. J Clin Invest 2023; 133:e172087. [PMID: 37490346 PMCID: PMC10503794 DOI: 10.1172/jci172087] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Accepted: 07/19/2023] [Indexed: 07/27/2023] Open
Abstract
Sickle cell disease (SCD) is a hereditary hemoglobinopathy characterized by painful vaso-occlusive crises (VOC) and chronic hemolysis. The mononuclear phagocyte system is pivotal to SCD pathophysiology, but the mechanisms governing monocyte/macrophage differentiation remain unknown. This study examined the influence of hemolysis on circulating monocyte trajectories in SCD. We discovered that hemolysis stimulated CSF-1 production, partly by endothelial cells via Nrf2, promoting classical monocyte (CMo) differentiation into blood patrolling monocytes (PMo) in SCD mice. However, hemolysis also upregulated CCL-2 through IFN-I, inducing CMo transmigration and differentiation into tissue monocyte-derived macrophages. Blocking CMo transmigration by anti-P selectin antibody in SCD mice increased circulating PMo, corroborating that CMo-to-tissue macrophage differentiation occurs at the expense of CMo-to-blood PMo differentiation. We observed a positive correlation between plasma CSF-1/CCL-2 ratios and blood PMo levels in patients with SCD, underscoring the clinical significance of these two opposing factors in monocyte differentiation. Combined treatment with CSF-1 and anti-P selectin antibody more effectively increased PMo numbers and reduced stasis compared with single-agent therapies in SCD mice. Altogether, these data indicate that monocyte fates are regulated by the balance between two heme pathways, Nrf2/CSF-1 and IFN-I/CCL-2, and suggest that the CSF-1/CCL-2 ratio may present a diagnostic and therapeutic target in SCD.
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Affiliation(s)
| | - Shan Su
- Laboratory of Complement Biology
| | | | | | | | - Kai Dou
- Laboratory of Immune Regulation, and
| | - Patricia A. Shi
- Clinical Research in Sickle Cell Disease, New York Blood Center, New York, New York, USA
| | - Banu Aygun
- Cohen Children’s Medical Center, New Hyde Park, Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Hempstead, New York, USA
| | - Sally Campbell-Lee
- Department of Pathology, University of Illinois at Chicago, Chicago, Illinois, USA
| | | | | | - Xiuli An
- Laboratory of Membrane Biology, New York Blood Center, New York, New York, USA
| | - Deepa Manwani
- Department of Pediatrics, Montefiore Medical Center, Albert Einstein College of Medicine, Children’s Hospital at Montefiore, New York, New York, USA
| | - Hui Zhong
- Laboratory of Immune Regulation, and
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3
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Pires IS, Berthiaume F, Palmer AF. Engineering Therapeutics to Detoxify Hemoglobin, Heme, and Iron. Annu Rev Biomed Eng 2023; 25:1-21. [PMID: 37289555 DOI: 10.1146/annurev-bioeng-081622-031203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Hemolysis (i.e., red blood cell lysis) can increase circulatory levels of cell-free hemoglobin (Hb) and its degradation by-products, namely heme (h) and iron (Fe). Under homeostasis, minor increases in these three hemolytic by-products (Hb/h/Fe) are rapidly scavenged and cleared by natural plasma proteins. Under certain pathophysiological conditions, scavenging systems become overwhelmed, leading to the accumulation of Hb/h/Fe in the circulation. Unfortunately, these species cause various side effects such as vasoconstriction, hypertension, and oxidative organ damage. Therefore, various therapeutics strategies are in development, ranging from supplementation with depleted plasma scavenger proteins to engineered biomimetic protein constructs capable of scavenging multiple hemolytic species. In this review, we briefly describe hemolysis and the characteristics of the major plasma-derived protein scavengers of Hb/h/Fe. Finally, we present novel engineering approaches designed to address the toxicity of these hemolytic by-products.
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Affiliation(s)
- Ivan S Pires
- William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio, USA;
| | - François Berthiaume
- Department of Biomedical Engineering, Rutgers University, Piscataway, New Jersey, USA
| | - Andre F Palmer
- William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio, USA;
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4
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Type I interferon is induced by hemolysis and drives antibody-mediated erythrophagocytosis in sickle cell disease. Blood 2021; 138:1162-1171. [PMID: 34166491 DOI: 10.1182/blood.2021011629] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Accepted: 06/01/2021] [Indexed: 11/20/2022] Open
Abstract
Patients with sickle cell disease (SCD) suffer from intravascular hemolysis associated vascular injury and tissue damage. Classical monocytes (CMo), which are the most abundant of circulating monocytes, are activated in SCD, but the cause and consequences of activation remain incompletely understood. We found a positive correlation between total plasma heme levels and circulating IFN-α in patients with SCD along with upregulation of the type I Interferon (IFN-I) inducible genes in sort-purified SCD patients' CMo by transcriptome analysis. We demonstrated that hemolysis led to IFN-I expression, predominantly by mouse liver monocyte and macrophages (Mϕ), primarily through Tank kinase binding 1 (TBK1)/IκB kinase-ε (IKKε) but not TLR4. In response to hemolysis-induced IFN-I, mouse CMo migrated to the liver and differentiated into monocyte derived Mϕ, increasing their numbers by 6-fold with acute hemin treatment. Hemolysis-driven IFN-I activity also led to the induction of Fc receptor CD64 expression on monocyte and Mϕ populations, enhancing alloantibody-mediated erythrophagocytosis in SCD both in vivo in mice and in in vitro human cultures. Altogether, these data demonstrate IFN-I response to hemolysis as a novel activation pathway in monocytes and Mϕ in SCD, opening the possibility for development of IFN-I-based diagnostics and therapeutics against alloantibody-mediated erythrophagocytosis.
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5
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Zhang P, Nguyen J, Abdulla F, Nelson AT, Beckman JD, Vercellotti GM, Belcher JD. Soluble MD-2 and Heme in Sickle Cell Disease Plasma Promote Pro-Inflammatory Signaling in Endothelial Cells. Front Immunol 2021; 12:632709. [PMID: 33841413 PMCID: PMC8033004 DOI: 10.3389/fimmu.2021.632709] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Accepted: 03/10/2021] [Indexed: 12/22/2022] Open
Abstract
Recent evidence indicates that hemolysis in sickle cell disease (SCD) promotes inflammation via innate immune signaling through toll-like receptor 4 (TLR4). Free heme released by hemolyzed red blood cells can bind to myeloid differentiation factor-2 (MD-2) and activate TLR4 pro-inflammatory signaling on endothelium to promote vaso-occlusion and acute chest syndrome in murine models of SCD. MD-2 is co-expressed with TLR4 on cell membranes, but in inflammatory conditions, soluble MD-2 (sMD-2) is elevated in plasma. sMD-2 levels were significantly increased in human and murine sickle (SS) plasma as compared to normal (AA) plasma. Human umbilical vein endothelial cells (HUVEC) and human lung microvascular endothelial cells incubated with human SS plasma had significant increases in pro-inflammatory IL-8, IL-6, and soluble VCAM-1 secretion compared to endothelial cells incubated with AA plasma. The increase in HUVEC IL-8 secretion was blocked by depletion of sMD-2 from SS plasma and enhanced by the addition of sMD-2 to AA plasma. The TLR4 signaling inhibitor, TAK-242, inhibited HUVEC IL-8 secretion in response to SS plasma by 85%. Heme-agarose pull-down assays and UV/Vis spectroscopy demonstrated that heme binds to sMD-2. Hemopexin, a high affinity heme-binding protein, inhibited HUVEC IL-8 secretion induced by SS plasma or SS and AA plasma supplemented with sMD-2. These data suggest that sMD-2 bound to heme might play an important role in pro-inflammatory signaling by endothelium in SCD.
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Affiliation(s)
- Ping Zhang
- Division of Hematology, Oncology and Transplantation, Department of Medicine, University of Minnesota, Minneapolis, MN, United States
| | - Julia Nguyen
- Division of Hematology, Oncology and Transplantation, Department of Medicine, University of Minnesota, Minneapolis, MN, United States
| | - Fuad Abdulla
- Division of Hematology, Oncology and Transplantation, Department of Medicine, University of Minnesota, Minneapolis, MN, United States
| | - Alexander T Nelson
- University of Minnesota School of Medicine, Minneapolis, MN, United States
| | - Joan D Beckman
- Division of Hematology, Oncology and Transplantation, Department of Medicine, University of Minnesota, Minneapolis, MN, United States
| | - Gregory M Vercellotti
- Division of Hematology, Oncology and Transplantation, Department of Medicine, University of Minnesota, Minneapolis, MN, United States
| | - John D Belcher
- Division of Hematology, Oncology and Transplantation, Department of Medicine, University of Minnesota, Minneapolis, MN, United States
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6
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Karnaukhova E, Owczarek C, Schmidt P, Schaer DJ, Buehler PW. Human Plasma and Recombinant Hemopexins: Heme Binding Revisited. Int J Mol Sci 2021; 22:ijms22031199. [PMID: 33530421 PMCID: PMC7866118 DOI: 10.3390/ijms22031199] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Accepted: 12/24/2020] [Indexed: 11/24/2022] Open
Abstract
Plasma hemopexin (HPX) is the key antioxidant protein of the endogenous clearance pathway that limits the deleterious effects of heme released from hemoglobin and myoglobin (the term “heme” is used in this article to denote both the ferrous and ferric forms). During intra-vascular hemolysis, heme partitioning to protein and lipid increases as the plasma concentration of HPX declines. Therefore, the development of HPX as a replacement therapy during high heme stress could be a relevant intervention for hemolytic disorders. A logical approach to enhance HPX yield involves recombinant production strategies from human cell lines. The present study focuses on a biophysical assessment of heme binding to recombinant human HPX (rhHPX) produced in the Expi293FTM (HEK293) cell system. In this report, we examine rhHPX in comparison with plasma HPX using a systematic analysis of protein structural and functional characteristics related to heme binding. Analysis of rhHPX by UV/Vis absorption spectroscopy, circular dichroism (CD), size-exclusion chromatography (SEC)-HPLC, and catalase-like activity demonstrated a similarity to HPX fractionated from plasma. In particular, the titration of HPX apo-protein(s) with heme was performed for the first time using a wide range of heme concentrations to model HPX–heme interactions to approximate physiological conditions (from extremely low to more than two-fold heme molar excess over the protein). The CD titration data showed an induced bisignate CD Soret band pattern typical for plasma and rhHPX versions at low heme-to-protein molar ratios and demonstrated that further titration is dependent on the amount of protein-bound heme to the extent that the arising opposite CD couplet results in a complete inversion of the observed CD pattern. The data generated in this study suggest more than one binding site in both plasma and rhHPX. Furthermore, our study provides a useful analytical platform for the detailed characterization of HPX–heme interactions and potentially novel HPX fusion constructs.
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Affiliation(s)
- Elena Karnaukhova
- Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, MD 20993, USA
- Correspondence: (E.K.); (P.W.B.)
| | - Catherine Owczarek
- CSL Limited, Bio21 Institute, Parkville, Victoria 3010, Australia; (C.O.); (P.S.)
| | - Peter Schmidt
- CSL Limited, Bio21 Institute, Parkville, Victoria 3010, Australia; (C.O.); (P.S.)
| | - Dominik J. Schaer
- Division of Internal Medicine, University Hospital of Zurich, 8091 Zurich, Switzerland;
| | - Paul W. Buehler
- Department of Pathology, The University of Maryland School of Medicine, Baltimore, MD 21201, USA
- The Center for Blood Oxygen Transport and Hemostasis, Department of Pediatrics, The University of Maryland School of Medicine, Baltimore, MD 21201, USA
- Correspondence: (E.K.); (P.W.B.)
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7
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Oxidative Stress and Thrombosis during Aging: The Roles of Oxidative Stress in RBCs in Venous Thrombosis. Int J Mol Sci 2020; 21:ijms21124259. [PMID: 32549393 PMCID: PMC7352981 DOI: 10.3390/ijms21124259] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Revised: 06/10/2020] [Accepted: 06/11/2020] [Indexed: 01/17/2023] Open
Abstract
Mid-life stage adults are at higher risk of developing venous thrombosis (VT)/thromboembolism (VT/E). Aging is characterized by an overproduction of reactive oxygen species (ROS), which could evoke a series of physiological changes involved in thrombosis. Here, we focus on the critical role of ROS within the red blood cell (RBC) in initiating venous thrombosis during aging. Growing evidence has shifted our interest in the role of unjustifiably unvalued RBCs in blood coagulation. RBCs can be a major source of oxidative stress during aging, since RBC redox homeostasis is generally compromised due to the discrepancy between prooxidants and antioxidants. As a result, ROS accumulate within the RBC due to the constant endogenous hemoglobin (Hb) autoxidation and NADPH oxidase activation, and the uptake of extracellular ROS released by other cells in the circulation. The elevated RBC ROS level affects the RBC membrane structure and function, causing loss of membrane integrity, and decreased deformability. These changes impair RBC function in hemostasis and thrombosis, favoring a hypercoagulable state through enhanced RBC aggregation, RBC binding to endothelial cells affecting nitric oxide availability, RBC-induced platelet activation consequently modulating their activity, RBC interaction with and activation of coagulation factors, increased RBC phosphatidylserine exposure and release of microvesicles, accelerated aging and hemolysis. Thus, RBC oxidative stress during aging typifies an ultimate mechanism in system failure, which can affect major processes involved in the development of venous thrombosis in a variety of ways. The reevaluated concept of the critical role of RBC ROS in the activation of thrombotic events during aging will help identify potential targets for novel strategies to prevent/reduce the risk for VT/E or VT/E recurrences in mid-life stage adults.
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8
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What Is Next in This "Age" of Heme-Driven Pathology and Protection by Hemopexin? An Update and Links with Iron. Pharmaceuticals (Basel) 2019; 12:ph12040144. [PMID: 31554244 PMCID: PMC6958331 DOI: 10.3390/ph12040144] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 09/08/2019] [Accepted: 09/19/2019] [Indexed: 02/07/2023] Open
Abstract
This review provides a synopsis of the published literature over the past two years on the heme-binding protein hemopexin (HPX), with some background information on the biochemistry of the HPX system. One focus is on the mechanisms of heme-driven pathology in the context of heme and iron homeostasis in human health and disease. The heme-binding protein hemopexin is a multi-functional protectant against hemoglobin (Hb)-derived heme toxicity as well as mitigating heme-mediated effects on immune cells, endothelial cells, and stem cells that collectively contribute to driving inflammation, perturbing vascular hemostasis and blood–brain barrier function. Heme toxicity, which may lead to iron toxicity, is recognized increasingly in a wide range of conditions involving hemolysis and immune system activation and, in this review, we highlight some newly identified actions of heme and hemopexin especially in situations where normal processes fail to maintain heme and iron homeostasis. Finally, we present preliminary data showing that the cytokine IL-6 cross talks with activation of the c-Jun N-terminal kinase pathway in response to heme-hemopexin in models of hepatocytes. This indicates another level of complexity in the cell responses to elevated heme via the HPX system when the immune system is activated and/or in the presence of inflammation.
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9
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Van Avondt K, Nur E, Zeerleder S. Mechanisms of haemolysis-induced kidney injury. Nat Rev Nephrol 2019; 15:671-692. [PMID: 31455889 DOI: 10.1038/s41581-019-0181-0] [Citation(s) in RCA: 89] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/10/2019] [Indexed: 12/16/2022]
Abstract
Intravascular haemolysis is a fundamental feature of chronic hereditary and acquired haemolytic anaemias, including those associated with haemoglobinopathies, complement disorders and infectious diseases such as malaria. Destabilization of red blood cells (RBCs) within the vasculature results in systemic inflammation, vasomotor dysfunction, thrombophilia and proliferative vasculopathy. The haemoprotein scavengers haptoglobin and haemopexin act to limit circulating levels of free haemoglobin, haem and iron - potentially toxic species that are released from injured RBCs. However, these adaptive defence systems can fail owing to ongoing intravascular disintegration of RBCs. Induction of the haem-degrading enzyme haem oxygenase 1 (HO1) - and potentially HO2 - represents a response to, and endogenous defence against, large amounts of cellular haem; however, this system can also become saturated. A frequent adverse consequence of massive and/or chronic haemolysis is kidney injury, which contributes to the morbidity and mortality of chronic haemolytic diseases. Intravascular destruction of RBCs and the resulting accumulation of haemoproteins can induce kidney injury via a number of mechanisms, including oxidative stress and cytotoxicity pathways, through the formation of intratubular casts and through direct as well as indirect proinflammatory effects, the latter via the activation of neutrophils and monocytes. Understanding of the detailed pathophysiology of haemolysis-induced kidney injury offers opportunities for the design and implementation of new therapeutic strategies to counteract the unfavourable and potentially fatal effects of haemolysis on the kidney.
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Affiliation(s)
- Kristof Van Avondt
- Department of Immunopathology, Sanquin Research, and Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands. .,Institute for Cardiovascular Prevention (IPEK), Ludwig Maximilian University of Munich, Munich, Germany.
| | - Erfan Nur
- Department of Haematology, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
| | - Sacha Zeerleder
- Department of Immunopathology, Sanquin Research, and Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands. .,Department of Haematology and Central Haematology Laboratory, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland. .,Department for BioMedical Research, University of Bern, Bern, Switzerland.
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10
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Iron Homeostasis in the Lungs-A Balance between Health and Disease. Pharmaceuticals (Basel) 2019; 12:ph12010005. [PMID: 30609678 PMCID: PMC6469191 DOI: 10.3390/ph12010005] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Revised: 12/23/2018] [Accepted: 12/25/2018] [Indexed: 12/15/2022] Open
Abstract
A strong mechanistic link between the regulation of iron homeostasis and oxygen sensing is evident in the lung, where both systems must be properly controlled to maintain lung function. Imbalances in pulmonary iron homeostasis are frequently associated with respiratory diseases, such as chronic obstructive pulmonary disease and with lung cancer. However, the underlying mechanisms causing alterations in iron levels and the involvement of iron in the development of lung disorders are incompletely understood. Here, we review current knowledge about the regulation of pulmonary iron homeostasis, its functional importance, and the link between dysregulated iron levels and lung diseases. Gaining greater knowledge on how iron contributes to the pathogenesis of these diseases holds promise for future iron-related therapeutic strategies.
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11
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Gáll T, Pethő D, Nagy A, Hendrik Z, Méhes G, Potor L, Gram M, Åkerström B, Smith A, Nagy P, Balla G, Balla J. Heme Induces Endoplasmic Reticulum Stress (HIER Stress) in Human Aortic Smooth Muscle Cells. Front Physiol 2018; 9:1595. [PMID: 30515102 PMCID: PMC6255930 DOI: 10.3389/fphys.2018.01595] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Accepted: 10/24/2018] [Indexed: 12/17/2022] Open
Abstract
Accumulation of damaged or misfolded proteins resulted from oxidative protein modification induces endoplasmic reticulum (ER) stress by activating the pathways of unfolded protein response. In pathologic hemolytic conditions, extracellular free hemoglobin is submitted to rapid oxidation causing heme release. Resident cells of atherosclerotic lesions, after intraplaque hemorrhage, are exposed to heme leading to oxidative injury. Therefore, we raised the question whether heme can also provoke ER stress. Smooth muscle cells are one of the key players of atherogenesis; thus, human aortic smooth muscle cells (HAoSMCs) were selected as a model cell to reveal the possible link between heme and ER stress. Using immunoblotting, quantitative polymerase chain reaction and immunocytochemistry, we quantitated the markers of ER stress. These were: phosphorylated eIF2α, Activating transcription factor-4 (ATF4), DNA-damage-inducible transcript 3 (also known as C/EBP homology protein, termed CHOP), X-box binding protein-1 (XBP1), Activating transcription factor-6 (ATF6), GRP78 (glucose-regulated protein, 78kDa) and heme responsive genes heme oxygenase-1 and ferritin. In addition, immunohistochemistry was performed on human carotid artery specimens from patients who had undergone carotid endarterectomy. We demonstrate that heme increases the phosphorylation of eiF2α in HAoSMCs and the expression of ATF4. Heme also enhances the splicing of XBP1 and the proteolytic cleavage of ATF6. Consequently, there is up-regulation of target genes increasing both mRNA and protein levels of CHOP and GRP78. However, TGFβ and collagen type I decreased. When the heme binding proteins, alpha-1-microglobulin (A1M) and hemopexin (Hpx) are present in cell media, the ER stress provoked by heme is inhibited. ER stress pathways are also retarded by the antioxidant N-acetyl cysteine (NAC) indicating that reactive oxygen species are involved in heme-induced ER stress. Consistent with these findings, elevated expression of the ER stress marker GRP78 and CHOP were observed in smooth muscle cells of complicated lesions with hemorrhage compared to either atheromas or healthy arteries. In conclusion, heme triggers ER stress in a time- and dose-dependent manner in HAoSMCs. A1M and Hpx as well as NAC effectively hamper heme-induced ER stress, supporting their use as a potential therapeutic approach to reverse such a deleterious effects of heme toxicity.
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Affiliation(s)
- Tamás Gáll
- HAS-UD Vascular Biology and Myocardial Pathophysiology Research Group, Hungarian Academy of Sciences, Debrecen, Hungary
- Department of Pediatrics, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Dávid Pethő
- Department of Internal Medicine, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Annamária Nagy
- Department of Internal Medicine, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Zoltán Hendrik
- Department of Pathology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Gábor Méhes
- Department of Pathology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - László Potor
- HAS-UD Vascular Biology and Myocardial Pathophysiology Research Group, Hungarian Academy of Sciences, Debrecen, Hungary
- Department of Pediatrics, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Magnus Gram
- Department of Clinical Sciences Lund, Infection Medicine, Lund University, Lund, Sweden
| | - Bo Åkerström
- Department of Clinical Sciences Lund, Infection Medicine, Lund University, Lund, Sweden
| | - Ann Smith
- Department of Molecular Biology and Biochemistry, School of Biological Sciences, University of Missouri-Kansas City, Kansas City, MO, United States
| | - Péter Nagy
- Department of Vascular Surgery, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - György Balla
- HAS-UD Vascular Biology and Myocardial Pathophysiology Research Group, Hungarian Academy of Sciences, Debrecen, Hungary
- Department of Pediatrics, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - József Balla
- HAS-UD Vascular Biology and Myocardial Pathophysiology Research Group, Hungarian Academy of Sciences, Debrecen, Hungary
- Department of Internal Medicine, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
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12
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Merle NS, Grunenwald A, Rajaratnam H, Gnemmi V, Frimat M, Figueres ML, Knockaert S, Bouzekri S, Charue D, Noe R, Robe-Rybkine T, Le-Hoang M, Brinkman N, Gentinetta T, Edler M, Petrillo S, Tolosano E, Miescher S, Le Jeune S, Houillier P, Chauvet S, Rabant M, Dimitrov JD, Fremeaux-Bacchi V, Blanc-Brude OP, Roumenina LT. Intravascular hemolysis activates complement via cell-free heme and heme-loaded microvesicles. JCI Insight 2018; 3:96910. [PMID: 29925688 DOI: 10.1172/jci.insight.96910] [Citation(s) in RCA: 116] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Accepted: 05/08/2018] [Indexed: 01/08/2023] Open
Abstract
In hemolytic diseases, such as sickle cell disease (SCD), intravascular hemolysis results in the release of hemoglobin, heme, and heme-loaded membrane microvesicles in the bloodstream. Intravascular hemolysis is thus associated with inflammation and organ injury. Complement system can be activated by heme in vitro. We investigated the mechanisms by which hemolysis and red blood cell (RBC) degradation products trigger complement activation in vivo. In kidney biopsies of SCD nephropathy patients and a mouse model with SCD, we detected tissue deposits of complement C3 and C5b-9. Moreover, drug-induced intravascular hemolysis or injection of heme or hemoglobin in mice triggered C3 deposition, primarily in kidneys. Renal injury markers (Kim-1, NGAL) were attenuated in C3-/- hemolytic mice. RBC degradation products, such as heme-loaded microvesicles and heme, induced alternative and terminal complement pathway activation in sera and on endothelial surfaces, in contrast to hemoglobin. Heme triggered rapid P selectin, C3aR, and C5aR expression and downregulated CD46 on endothelial cells. Importantly, complement deposition was attenuated in vivo and in vitro by heme scavenger hemopexin. In conclusion, we demonstrate that intravascular hemolysis triggers complement activation in vivo, encouraging further studies on its role in SCD nephropathy. Conversely, heme inhibition using hemopexin may provide a novel therapeutic opportunity to limit complement activation in hemolytic diseases.
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Affiliation(s)
- Nicolas S Merle
- INSERM, UMRS 1138, Centre de Recherche des Cordeliers, Paris, France.,Sorbonne Universités, Université Pierre et Marie Curie - Paris 06, Paris France.,Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Anne Grunenwald
- INSERM, UMRS 1138, Centre de Recherche des Cordeliers, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, Paris, France.,Université Lille, INSERM, CHRU Lille, Service de pathologie, UMRS 1172, Jean-Pierre Aubert Research Center, Lille, France
| | - Helena Rajaratnam
- INSERM, UMRS 1138, Centre de Recherche des Cordeliers, Paris, France.,SupBiotech Paris, Villejuif, France
| | - Viviane Gnemmi
- Université Lille, INSERM, CHRU Lille, Service de pathologie, UMRS 1172, Jean-Pierre Aubert Research Center, Lille, France
| | - Marie Frimat
- INSERM, UMR 995, Lille, France.,CHRU Lille, Service de néphrologie, Lille, France
| | - Marie-Lucile Figueres
- INSERM, UMRS 1138, Centre de Recherche des Cordeliers, Paris, France.,Sorbonne Universités, Université Pierre et Marie Curie - Paris 06, Paris France.,Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Samantha Knockaert
- INSERM, UMRS 1138, Centre de Recherche des Cordeliers, Paris, France.,Sorbonne Universités, Université Pierre et Marie Curie - Paris 06, Paris France.,Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Sanah Bouzekri
- INSERM, UMRS 1138, Centre de Recherche des Cordeliers, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Dominique Charue
- Université Paris Descartes, Sorbonne Paris Cité, Paris, France.,Paris Center for Cardiovascular Research, INSERM UMRS 970, Paris, France
| | - Remi Noe
- INSERM, UMRS 1138, Centre de Recherche des Cordeliers, Paris, France.,Ecole Pratique des Hautes Études, Paris, France
| | - Tania Robe-Rybkine
- INSERM, UMRS 1138, Centre de Recherche des Cordeliers, Paris, France.,Sorbonne Universités, Université Pierre et Marie Curie - Paris 06, Paris France.,Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Marie Le-Hoang
- Université Paris Descartes, Sorbonne Paris Cité, Paris, France.,Paris Center for Cardiovascular Research, INSERM UMRS 970, Paris, France
| | | | | | | | - Sara Petrillo
- Department Molecular Biotechnology and Health Sciences, Molecular Biotechnology Center, University of Torino, Torino, Italy
| | - Emanuela Tolosano
- Department Molecular Biotechnology and Health Sciences, Molecular Biotechnology Center, University of Torino, Torino, Italy
| | | | - Sylvain Le Jeune
- Assistance Publique - Hôpitaux de Paris, Service de Médecine Interne, Hôpital Avicenne, Bobigny, France
| | - Pascal Houillier
- INSERM, UMRS 1138, Centre de Recherche des Cordeliers, Paris, France.,Sorbonne Universités, Université Pierre et Marie Curie - Paris 06, Paris France.,Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Sophie Chauvet
- INSERM, UMRS 1138, Centre de Recherche des Cordeliers, Paris, France.,Sorbonne Universités, Université Pierre et Marie Curie - Paris 06, Paris France.,Université Paris Descartes, Sorbonne Paris Cité, Paris, France.,Assistance Publique - Hôpitaux de Paris, Service de Néphrologie, Hôpital Européen Georges Pompidou, Paris, France
| | - Marion Rabant
- Assistance Publique - Hôpitaux de Paris, Service de Pathologie, Hôpital Necker Enfants Malades, Paris, France
| | - Jordan D Dimitrov
- INSERM, UMRS 1138, Centre de Recherche des Cordeliers, Paris, France.,Sorbonne Universités, Université Pierre et Marie Curie - Paris 06, Paris France.,Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Veronique Fremeaux-Bacchi
- INSERM, UMRS 1138, Centre de Recherche des Cordeliers, Paris, France.,Sorbonne Universités, Université Pierre et Marie Curie - Paris 06, Paris France.,Université Paris Descartes, Sorbonne Paris Cité, Paris, France.,Assistance Publique - Hôpitaux de Paris, Service d'Immunologie Biologique, Hôpital Européen Georges Pompidou, Paris, France
| | - Olivier P Blanc-Brude
- Université Paris Descartes, Sorbonne Paris Cité, Paris, France.,Paris Center for Cardiovascular Research, INSERM UMRS 970, Paris, France
| | - Lubka T Roumenina
- INSERM, UMRS 1138, Centre de Recherche des Cordeliers, Paris, France.,Sorbonne Universités, Université Pierre et Marie Curie - Paris 06, Paris France.,Université Paris Descartes, Sorbonne Paris Cité, Paris, France
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13
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Abstract
The primary β-globin gene mutation that causes sickle cell disease (SCD) has significant pathophysiological consequences that result in hemolytic events and the induction of the inflammatory processes that ultimately lead to vaso-occlusion. In addition to their role in the initiation of the acute painful vaso-occlusive episodes that are characteristic of SCD, inflammatory processes are also key components of many of the complications of the disease including autosplenectomy, acute chest syndrome, pulmonary hypertension, leg ulcers, nephropathy and stroke. We, herein, discuss the events that trigger inflammation in the disease, as well as the mechanisms, inflammatory molecules and cells that propagate these inflammatory processes. Given the central role that inflammation plays in SCD pathophysiology, many of the therapeutic approaches currently under pre-clinical and clinical development for the treatment of SCD endeavor to counter aspects or specific molecules of these inflammatory processes and it is possible that, in the future, we will see anti-inflammatory drugs being used either together with, or in place of, hydroxyurea in those SCD patients for whom hematopoietic stem cell transplants and evolving gene therapies are not a viable option.
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Affiliation(s)
- Nicola Conran
- Hematology Center, University of Campinas - UNICAMP, Cidade Universitária, Campinas-SP, Brazil
| | - John D Belcher
- Department of Medicine, Division of Hematology, Oncology and Transplantation, Vascular Biology Center, University of Minnesota, Minneapolis, MN, USA
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14
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Belcher JD, Chen C, Nguyen J, Abdulla F, Zhang P, Nguyen H, Nguyen P, Killeen T, Miescher SM, Brinkman N, Nath KA, Steer CJ, Vercellotti GM. Haptoglobin and hemopexin inhibit vaso-occlusion and inflammation in murine sickle cell disease: Role of heme oxygenase-1 induction. PLoS One 2018; 13:e0196455. [PMID: 29694434 PMCID: PMC5919001 DOI: 10.1371/journal.pone.0196455] [Citation(s) in RCA: 77] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Accepted: 04/15/2018] [Indexed: 01/29/2023] Open
Abstract
During hemolysis, hemoglobin and heme released from red blood cells promote oxidative stress, inflammation and thrombosis. Plasma haptoglobin and hemopexin scavenge free hemoglobin and heme, respectively, but can be depleted in hemolytic states. Haptoglobin and hemopexin supplementation protect tissues, including the vasculature, liver and kidneys. It is widely assumed that these protective effects are due primarily to hemoglobin and heme clearance from the vasculature. However, this simple assumption does not account for the consequent cytoprotective adaptation seen in cells and organs. To further address the mechanism, we used a hyperhemolytic murine model (Townes-SS) of sickle cell disease to examine cellular responses to haptoglobin and hemopexin supplementation. A single infusion of haptoglobin or hemopexin (± equimolar hemoglobin) in SS-mice increased heme oxygenase-1 (HO-1) in the liver, kidney and skin several fold within 1 hour and decreased nuclear NF-ĸB phospho-p65, and vaso-occlusion for 48 hours after infusion. Plasma hemoglobin and heme levels were not significantly changed 1 hour after infusion of haptoglobin or hemopexin. Haptoglobin and hemopexin also inhibited hypoxia/reoxygenation and lipopolysaccharide-induced vaso-occlusion in SS-mice. Inhibition of HO-1 activity with tin protoporphyrin blocked the protections afforded by haptoglobin and hemopexin in SS-mice. The HO-1 reaction product carbon monoxide, fully restored the protection, in part by inhibiting Weibel-Palade body mobilization of P-selectin and von Willebrand factor to endothelial cell surfaces. Thus, the mechanism by which haptoglobin and hemopexin supplementation in hyperhemolytic SS-mice induces cytoprotective cellular responses is linked to increased HO-1 activity.
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Affiliation(s)
- John D. Belcher
- Department of Medicine, Division of Hematology, Oncology and Transplantation, Vascular Biology Center, University of Minnesota, Minneapolis, Minnesota, United States of America
- * E-mail:
| | - Chunsheng Chen
- Department of Medicine, Division of Hematology, Oncology and Transplantation, Vascular Biology Center, University of Minnesota, Minneapolis, Minnesota, United States of America
| | - Julia Nguyen
- Department of Medicine, Division of Hematology, Oncology and Transplantation, Vascular Biology Center, University of Minnesota, Minneapolis, Minnesota, United States of America
| | - Fuad Abdulla
- Department of Medicine, Division of Hematology, Oncology and Transplantation, Vascular Biology Center, University of Minnesota, Minneapolis, Minnesota, United States of America
| | - Ping Zhang
- Department of Medicine, Division of Hematology, Oncology and Transplantation, Vascular Biology Center, University of Minnesota, Minneapolis, Minnesota, United States of America
| | - Hao Nguyen
- Department of Medicine, Division of Hematology, Oncology and Transplantation, Vascular Biology Center, University of Minnesota, Minneapolis, Minnesota, United States of America
| | - Phong Nguyen
- Department of Medicine, Division of Hematology, Oncology and Transplantation, Vascular Biology Center, University of Minnesota, Minneapolis, Minnesota, United States of America
| | - Trevor Killeen
- Department of Medicine, Division of Hematology, Oncology and Transplantation, Vascular Biology Center, University of Minnesota, Minneapolis, Minnesota, United States of America
| | | | - Nathan Brinkman
- CSL Behring, Research & Development, Kankakee, Illinois, United States of America
| | - Karl A. Nath
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minnesota, United States of America
| | - Clifford J. Steer
- Department of Medicine, Division of Gastroenterology, Hepatology and Nutrition, University of Minnesota, Minneapolis, Minnesota, United States of America
| | - Gregory M. Vercellotti
- Department of Medicine, Division of Hematology, Oncology and Transplantation, Vascular Biology Center, University of Minnesota, Minneapolis, Minnesota, United States of America
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15
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Louie JE, Anderson CJ, Fayaz M. Fomani K, Henry A, Killeen T, Mohandas N, Yazdanbakhsh K, Belcher JD, Vercellotti GM, Shi PA. Case series supporting heme detoxification via therapeutic plasma exchange in acute multiorgan failure syndrome resistant to red blood cell exchange in sickle cell disease. Transfusion 2017; 58:470-479. [DOI: 10.1111/trf.14407] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Revised: 10/08/2017] [Accepted: 10/08/2017] [Indexed: 01/25/2023]
Affiliation(s)
- James E. Louie
- Long Island Jewish Medical Center, Northwell Health; New Hyde Park New York
| | - Caitlin J. Anderson
- Lindley F. Kimball Research Institute, New York Blood Center; New York New York
| | | | - Alonye Henry
- Lindley F. Kimball Research Institute, New York Blood Center; New York New York
| | - Trevor Killeen
- Department of Hematology, Oncology, and Transplantation; University of Minnesota Medical School; Minneapolis Minnesota
| | - Narla Mohandas
- Lindley F. Kimball Research Institute, New York Blood Center; New York New York
| | - Karina Yazdanbakhsh
- Lindley F. Kimball Research Institute, New York Blood Center; New York New York
| | - John D. Belcher
- Department of Hematology, Oncology, and Transplantation; University of Minnesota Medical School; Minneapolis Minnesota
| | - Gregory M. Vercellotti
- Department of Hematology, Oncology, and Transplantation; University of Minnesota Medical School; Minneapolis Minnesota
| | - Patricia A. Shi
- Lindley F. Kimball Research Institute, New York Blood Center; New York New York
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16
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Hahl P, Hunt R, Bjes ES, Skaff A, Keightley A, Smith A. Identification of oxidative modifications of hemopexin and their predicted physiological relevance. J Biol Chem 2017; 292:13658-13671. [PMID: 28596380 DOI: 10.1074/jbc.m117.783951] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Revised: 06/07/2017] [Indexed: 12/26/2022] Open
Abstract
Hemopexin protects against heme toxicity in hemolytic diseases and conditions, sepsis, and sickle cell disease. This protection is sustained by heme-hemopexin complexes in biological fluids that resist oxidative damage during heme-driven inflammation. However, apo-hemopexin is vulnerable to inactivation by reactive nitrogen (RNS) and oxygen species (ROS) that covalently modify amino acids. The resultant nitration of amino acids is considered a specific effect reflecting biological events. Using LC-MS, we discovered low endogenous levels of tyrosine nitration in the peptide YYCFQGNQFLR in the heme-binding site of human hemopexin, which was similarly nitrated in rabbit and rat hemopexins. Immunoblotting and selective reaction monitoring were used to quantify tyrosine nitration of in vivo samples and when hemopexin was incubated in vitro with nitrating nitrite/myeloperoxidase/glucose oxidase. Significantly, heme binding by hemopexin declined as tyrosine nitration proceeded in vitro Three nitrated tyrosines reside in the heme-binding site of hemopexin, and we found that one, Tyr-199, interacts directly with the heme ring D propionate. Investigating the oxidative modifications of amino acids after incubation with tert-butyl hydroperoxide and hypochlorous acid in vitro, we identified additional covalent oxidative modifications on four tyrosine residues and one tryptophan residue of hemopexin. Importantly, three of the four modified tyrosines, some of which have more than one modification, cluster in the heme-binding site, supporting a hierarchy of vulnerable amino acids. We propose that during inflammation, apo-hemopexin is nitrated and oxidated in niches of the body containing activated RNS- and ROS-generating immune and endothelial cells, potentially impairing hemopexin's protective extracellular antioxidant function.
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Affiliation(s)
- Peter Hahl
- From the Department of Molecular Biology and Biochemistry, School of Biological Sciences, University of Missouri-Kansas City, Kansas City, Missouri 64110-2239
| | - Rachel Hunt
- From the Department of Molecular Biology and Biochemistry, School of Biological Sciences, University of Missouri-Kansas City, Kansas City, Missouri 64110-2239
| | - Edward S Bjes
- From the Department of Molecular Biology and Biochemistry, School of Biological Sciences, University of Missouri-Kansas City, Kansas City, Missouri 64110-2239
| | - Andrew Skaff
- From the Department of Molecular Biology and Biochemistry, School of Biological Sciences, University of Missouri-Kansas City, Kansas City, Missouri 64110-2239
| | - Andrew Keightley
- From the Department of Molecular Biology and Biochemistry, School of Biological Sciences, University of Missouri-Kansas City, Kansas City, Missouri 64110-2239
| | - Ann Smith
- From the Department of Molecular Biology and Biochemistry, School of Biological Sciences, University of Missouri-Kansas City, Kansas City, Missouri 64110-2239
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17
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Gomperts E, Belcher JD, Otterbein LE, Coates TD, Wood J, Skolnick BE, Levy H, Vercellotti GM. The role of carbon monoxide and heme oxygenase in the prevention of sickle cell disease vaso-occlusive crises. Am J Hematol 2017; 92:569-582. [PMID: 28378932 PMCID: PMC5723421 DOI: 10.1002/ajh.24750] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Revised: 03/28/2017] [Accepted: 03/29/2017] [Indexed: 12/15/2022]
Abstract
Sickle Cell Disease (SCD) is a painful, lifelong hemoglobinopathy inherited as a missense point mutation in the hemoglobin (Hb) beta-globin gene. This disease has significant impact on quality of life and mortality, thus a substantial medical need exists to reduce the vaso-occlusive crises which underlie the pathophysiology of the disease. The concept that a gaseous molecule may exert biological function has been well known for over one hundred years. Carbon monoxide (CO), although studied in SCD for over 50 years, has recently emerged as a powerful cytoprotective biological response modifier capable of regulating a host of physiologic and therapeutic processes that, at low concentrations, exerts key physiological functions in various models of tissue inflammation and injury. CO is physiologically generated by the metabolism of heme by the heme oxygenase enzymes and is measurable in blood. A substantial amount of preclinical and clinical data with CO have been generated, which provide compelling support for CO as a potential therapeutic in a number of pathological conditions. Data underlying the therapeutic mechanisms of CO, including in SCD, have been generated by a plethora of in vitro and preclinical studies including multiple SCD mouse models. These data show CO to have key signaling impacts on a host of metallo-enzymes as well as key modulating genes that in sum, result in significant anti-inflammatory, anti-oxidant and anti-apoptotic effects as well as vasodilation and anti-adhesion of cells to the endothelium resulting in preservation of vascular flow. CO may also have a role as an anti-polymerization HbS agent. In addition, considerable scientific data in the non-SCD literature provide evidence for a beneficial impact of CO on cerebrovascular complications, suggesting that in SCD, CO could potentially limit these highly problematic neurologic outcomes. Research is needed and hopefully forthcoming, to carefully elucidate the safety and benefits of this potential therapy across the age spectrum of patients impacted by the host of pathophysiological complications of this devastating disease.
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Affiliation(s)
- Edward Gomperts
- Hillhurst Biopharmaceuticals, Inc, 2029 Verdugo Blvd., #125, Montrose, CA, 91020, USA
| | - John D Belcher
- University of Minnesota, 420 Delaware Street SE, MMC 480, Minneapolis, MN, 55455, USA
| | - Leo E Otterbein
- Harvard Medical School; Beth Israel Deaconess Medical Center, 3 Blackfan Circle Center for Life Sciences, #630, Boston, MA, 02115, USA
| | - Thomas D Coates
- Children's Hospital Los Angeles; University of Southern California, 4650 Sunset Boulevard MS #54 Los Angeles, CA, 90027, USA
| | - John Wood
- Children's Hospital Los Angeles; University of Southern California, 4650 Sunset Boulevard MS #54 Los Angeles, CA, 90027, USA
| | - Brett E Skolnick
- Hillhurst Biopharmaceuticals, Inc, 2029 Verdugo Blvd., #125, Montrose, CA, 91020, USA
| | - Howard Levy
- Hillhurst Biopharmaceuticals, Inc, 2029 Verdugo Blvd., #125, Montrose, CA, 91020, USA
| | - Gregory M Vercellotti
- University of Minnesota, 420 Delaware Street SE, MMC 480, Minneapolis, MN, 55455, USA
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18
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Guarda CCD, Santiago RP, Fiuza LM, Aleluia MM, Ferreira JRD, Figueiredo CVB, Yahouedehou SCMA, Oliveira RMD, Lyra IM, Gonçalves MDS. Heme-mediated cell activation: the inflammatory puzzle of sickle cell anemia. Expert Rev Hematol 2017; 10:533-541. [PMID: 28482712 DOI: 10.1080/17474086.2017.1327809] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
INTRODUCTION Hemolysis triggers the onset of several clinical manifestations of sickle cell anemia (SCA). During hemolysis, heme, which is derived from hemoglobin (Hb), accumulates due to the inability of detoxification systems to scavenge sufficiently. Heme exerts multiple harmful effects, including leukocyte activation and migration, enhanced adhesion molecule expression by endothelial cells and the production of pro-oxidant molecules. Area covered: In this review, we describe the effects of heme on leukocytes and endothelial cells, as well as the features of vascular endothelial cells related to vaso-occlusion in SCA. Expert commentary: Free Hb, heme and iron, potent cytotoxic intravascular molecules released during hemolysis, can exacerbate, modulate and maintain the inflammatory response, a main feature of SCA. Endothelial cells in the vascular environment, as well as leukocytes, can become activated via the molecular signaling effects of heme. Due to the hemolytic nature of SCA, hemolysis represents an interesting therapeutic target for heme-scavenging purposes.
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Affiliation(s)
- Caroline Conceição da Guarda
- a Laboratório de Hematologia, Genética e Biologia Computacional , Instituto Gonçalo Moniz, FIOCRUZ , Salvador , Bahia , Brasil
| | - Rayra Pereira Santiago
- a Laboratório de Hematologia, Genética e Biologia Computacional , Instituto Gonçalo Moniz, FIOCRUZ , Salvador , Bahia , Brasil
| | - Luciana Magalhães Fiuza
- a Laboratório de Hematologia, Genética e Biologia Computacional , Instituto Gonçalo Moniz, FIOCRUZ , Salvador , Bahia , Brasil
| | - Milena Magalhães Aleluia
- a Laboratório de Hematologia, Genética e Biologia Computacional , Instituto Gonçalo Moniz, FIOCRUZ , Salvador , Bahia , Brasil
| | - Júnia Raquel Dutra Ferreira
- a Laboratório de Hematologia, Genética e Biologia Computacional , Instituto Gonçalo Moniz, FIOCRUZ , Salvador , Bahia , Brasil.,b Faculdade de Farmácia , Universidade Federal da Bahia , Salvador , Bahia , Brasil
| | - Camylla Vilas Boas Figueiredo
- a Laboratório de Hematologia, Genética e Biologia Computacional , Instituto Gonçalo Moniz, FIOCRUZ , Salvador , Bahia , Brasil
| | | | | | - Isa Menezes Lyra
- c Hematologia, Fundação de Hematologia e Hemoterapia do Estado da Bahia , Salvador , Bahia , Brasil
| | - Marilda de Souza Gonçalves
- a Laboratório de Hematologia, Genética e Biologia Computacional , Instituto Gonçalo Moniz, FIOCRUZ , Salvador , Bahia , Brasil.,b Faculdade de Farmácia , Universidade Federal da Bahia , Salvador , Bahia , Brasil
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19
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Smith A, McCulloh RJ. Mechanisms of haem toxicity in haemolysis and protection by the haem-binding protein, haemopexin. ACTA ACUST UNITED AC 2017. [DOI: 10.1111/voxs.12340] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- A. Smith
- School of Biological Sciences; University of Missouri-Kansas City; Kansas City MO USA
| | - R. J. McCulloh
- Department of Pediatrics; Children's Mercy Hospital; Kansas City MO USA
- University of Missouri-Kansas City School of Medicine; Kansas City MO USA
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20
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Graw JA, Mayeur C, Rosales I, Liu Y, Sabbisetti VS, Riley FE, Rechester O, Malhotra R, Warren HS, Colvin RB, Bonventre JV, Bloch DB, Zapol WM. Haptoglobin or Hemopexin Therapy Prevents Acute Adverse Effects of Resuscitation After Prolonged Storage of Red Cells. Circulation 2016; 134:945-60. [PMID: 27515135 DOI: 10.1161/circulationaha.115.019955] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Accepted: 06/30/2016] [Indexed: 12/15/2022]
Abstract
BACKGROUND Extracellular hemoglobin and cell-free heme are toxic breakdown products of hemolyzed erythrocytes. Mammals synthesize the scavenger proteins haptoglobin and hemopexin, which bind extracellular hemoglobin and heme, respectively. Transfusion of packed red blood cells is a lifesaving therapy for patients with hemorrhagic shock. Because erythrocytes undergo progressive deleterious morphological and biochemical changes during storage, transfusion of packed red blood cells that have been stored for prolonged intervals (SRBCs; stored for 35-40 days in humans or 14 days in mice) increases plasma levels of cell-free hemoglobin and heme. Therefore, in patients with hemorrhagic shock, perfusion-sensitive organs such as the kidneys are challenged not only by hypoperfusion but also by the high concentrations of plasma hemoglobin and heme that are associated with the transfusion of SRBCs. METHODS To test whether treatment with exogenous human haptoglobin or hemopexin can ameliorate adverse effects of resuscitation with SRBCs after 2 hours of hemorrhagic shock, mice that received SRBCs were given a coinfusion of haptoglobin, hemopexin, or albumin. RESULTS Treatment with haptoglobin or hemopexin but not albumin improved the survival rate and attenuated SRBC-induced inflammation. Treatment with haptoglobin retained free hemoglobin in the plasma and prevented SRBC-induced hemoglobinuria and kidney injury. In mice resuscitated with fresh packed red blood cells, treatment with haptoglobin, hemopexin, or albumin did not cause harmful effects. CONCLUSIONS In mice, the adverse effects of transfusion with SRBCs after hemorrhagic shock are ameliorated by treatment with either haptoglobin or hemopexin. Haptoglobin infusion prevents kidney injury associated with high plasma hemoglobin concentrations after resuscitation with SRBCs. Treatment with the naturally occurring human plasma proteins haptoglobin or hemopexin may have beneficial effects in conditions of severe hemolysis after prolonged hypotension.
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Affiliation(s)
- Jan A Graw
- From Anesthesia Center for Critical Care Research of the Department of Anesthesia, Critical Care, and Pain Medicine (J.A.G., C.M., D.B.B., W.M.Z.), Department of Pathology (I.R., R.B.C.), Department of Pediatrics (F.E.R., O.R., H.S.W.), Cardiovascular Research Center and Cardiology Division, Department of Medicine (R.M.), and Division of Rheumatology, Allergy and Immunology, Department of Medicine (D.B.B.), Massachusetts General Hospital, Harvard Medical School, Boston; and Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (Y.L., V.S.S., H.S.W.)
| | - Claire Mayeur
- From Anesthesia Center for Critical Care Research of the Department of Anesthesia, Critical Care, and Pain Medicine (J.A.G., C.M., D.B.B., W.M.Z.), Department of Pathology (I.R., R.B.C.), Department of Pediatrics (F.E.R., O.R., H.S.W.), Cardiovascular Research Center and Cardiology Division, Department of Medicine (R.M.), and Division of Rheumatology, Allergy and Immunology, Department of Medicine (D.B.B.), Massachusetts General Hospital, Harvard Medical School, Boston; and Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (Y.L., V.S.S., H.S.W.)
| | - Ivy Rosales
- From Anesthesia Center for Critical Care Research of the Department of Anesthesia, Critical Care, and Pain Medicine (J.A.G., C.M., D.B.B., W.M.Z.), Department of Pathology (I.R., R.B.C.), Department of Pediatrics (F.E.R., O.R., H.S.W.), Cardiovascular Research Center and Cardiology Division, Department of Medicine (R.M.), and Division of Rheumatology, Allergy and Immunology, Department of Medicine (D.B.B.), Massachusetts General Hospital, Harvard Medical School, Boston; and Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (Y.L., V.S.S., H.S.W.)
| | - Yumin Liu
- From Anesthesia Center for Critical Care Research of the Department of Anesthesia, Critical Care, and Pain Medicine (J.A.G., C.M., D.B.B., W.M.Z.), Department of Pathology (I.R., R.B.C.), Department of Pediatrics (F.E.R., O.R., H.S.W.), Cardiovascular Research Center and Cardiology Division, Department of Medicine (R.M.), and Division of Rheumatology, Allergy and Immunology, Department of Medicine (D.B.B.), Massachusetts General Hospital, Harvard Medical School, Boston; and Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (Y.L., V.S.S., H.S.W.)
| | - Venkata S Sabbisetti
- From Anesthesia Center for Critical Care Research of the Department of Anesthesia, Critical Care, and Pain Medicine (J.A.G., C.M., D.B.B., W.M.Z.), Department of Pathology (I.R., R.B.C.), Department of Pediatrics (F.E.R., O.R., H.S.W.), Cardiovascular Research Center and Cardiology Division, Department of Medicine (R.M.), and Division of Rheumatology, Allergy and Immunology, Department of Medicine (D.B.B.), Massachusetts General Hospital, Harvard Medical School, Boston; and Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (Y.L., V.S.S., H.S.W.)
| | - Frank E Riley
- From Anesthesia Center for Critical Care Research of the Department of Anesthesia, Critical Care, and Pain Medicine (J.A.G., C.M., D.B.B., W.M.Z.), Department of Pathology (I.R., R.B.C.), Department of Pediatrics (F.E.R., O.R., H.S.W.), Cardiovascular Research Center and Cardiology Division, Department of Medicine (R.M.), and Division of Rheumatology, Allergy and Immunology, Department of Medicine (D.B.B.), Massachusetts General Hospital, Harvard Medical School, Boston; and Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (Y.L., V.S.S., H.S.W.)
| | - Osher Rechester
- From Anesthesia Center for Critical Care Research of the Department of Anesthesia, Critical Care, and Pain Medicine (J.A.G., C.M., D.B.B., W.M.Z.), Department of Pathology (I.R., R.B.C.), Department of Pediatrics (F.E.R., O.R., H.S.W.), Cardiovascular Research Center and Cardiology Division, Department of Medicine (R.M.), and Division of Rheumatology, Allergy and Immunology, Department of Medicine (D.B.B.), Massachusetts General Hospital, Harvard Medical School, Boston; and Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (Y.L., V.S.S., H.S.W.)
| | - Rajeev Malhotra
- From Anesthesia Center for Critical Care Research of the Department of Anesthesia, Critical Care, and Pain Medicine (J.A.G., C.M., D.B.B., W.M.Z.), Department of Pathology (I.R., R.B.C.), Department of Pediatrics (F.E.R., O.R., H.S.W.), Cardiovascular Research Center and Cardiology Division, Department of Medicine (R.M.), and Division of Rheumatology, Allergy and Immunology, Department of Medicine (D.B.B.), Massachusetts General Hospital, Harvard Medical School, Boston; and Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (Y.L., V.S.S., H.S.W.)
| | - H Shaw Warren
- From Anesthesia Center for Critical Care Research of the Department of Anesthesia, Critical Care, and Pain Medicine (J.A.G., C.M., D.B.B., W.M.Z.), Department of Pathology (I.R., R.B.C.), Department of Pediatrics (F.E.R., O.R., H.S.W.), Cardiovascular Research Center and Cardiology Division, Department of Medicine (R.M.), and Division of Rheumatology, Allergy and Immunology, Department of Medicine (D.B.B.), Massachusetts General Hospital, Harvard Medical School, Boston; and Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (Y.L., V.S.S., H.S.W.)
| | - Robert B Colvin
- From Anesthesia Center for Critical Care Research of the Department of Anesthesia, Critical Care, and Pain Medicine (J.A.G., C.M., D.B.B., W.M.Z.), Department of Pathology (I.R., R.B.C.), Department of Pediatrics (F.E.R., O.R., H.S.W.), Cardiovascular Research Center and Cardiology Division, Department of Medicine (R.M.), and Division of Rheumatology, Allergy and Immunology, Department of Medicine (D.B.B.), Massachusetts General Hospital, Harvard Medical School, Boston; and Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (Y.L., V.S.S., H.S.W.)
| | - Joseph V Bonventre
- From Anesthesia Center for Critical Care Research of the Department of Anesthesia, Critical Care, and Pain Medicine (J.A.G., C.M., D.B.B., W.M.Z.), Department of Pathology (I.R., R.B.C.), Department of Pediatrics (F.E.R., O.R., H.S.W.), Cardiovascular Research Center and Cardiology Division, Department of Medicine (R.M.), and Division of Rheumatology, Allergy and Immunology, Department of Medicine (D.B.B.), Massachusetts General Hospital, Harvard Medical School, Boston; and Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (Y.L., V.S.S., H.S.W.)
| | - Donald B Bloch
- From Anesthesia Center for Critical Care Research of the Department of Anesthesia, Critical Care, and Pain Medicine (J.A.G., C.M., D.B.B., W.M.Z.), Department of Pathology (I.R., R.B.C.), Department of Pediatrics (F.E.R., O.R., H.S.W.), Cardiovascular Research Center and Cardiology Division, Department of Medicine (R.M.), and Division of Rheumatology, Allergy and Immunology, Department of Medicine (D.B.B.), Massachusetts General Hospital, Harvard Medical School, Boston; and Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (Y.L., V.S.S., H.S.W.)
| | - Warren M Zapol
- From Anesthesia Center for Critical Care Research of the Department of Anesthesia, Critical Care, and Pain Medicine (J.A.G., C.M., D.B.B., W.M.Z.), Department of Pathology (I.R., R.B.C.), Department of Pediatrics (F.E.R., O.R., H.S.W.), Cardiovascular Research Center and Cardiology Division, Department of Medicine (R.M.), and Division of Rheumatology, Allergy and Immunology, Department of Medicine (D.B.B.), Massachusetts General Hospital, Harvard Medical School, Boston; and Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (Y.L., V.S.S., H.S.W.).
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21
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Shi PA, Choi E, Chintagari NR, Nguyen J, Guo X, Yazdanbakhsh K, Mohandas N, Alayash AI, Manci EA, Belcher JD, Vercellotti GM. Sustained treatment of sickle cell mice with haptoglobin increases HO-1 and H-ferritin expression and decreases iron deposition in the kidney without improvement in kidney function. Br J Haematol 2016; 175:714-723. [PMID: 27507623 DOI: 10.1111/bjh.14280] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Accepted: 06/06/2016] [Indexed: 12/21/2022]
Abstract
There is growing evidence that extracellular haemoglobin and haem mediate inflammatory and oxidative damage in sickle cell disease. Haptoglobin (Hp), the scavenger for free haemoglobin, is depleted in most patients with sickle cell disease due to chronic haemolysis. Although single infusions of Hp can ameliorate vaso-occlusion in mouse models of sickle cell disease, prior studies have not examined the therapeutic benefits of more chronic Hp dosing on sickle cell disease manifestations. In the present study, we explored the effect of Hp treatment over a 3-month period in sickle mice at two dosing regimens: the first at a moderate dose of 200 mg/kg thrice weekly and the second at a higher dose of 400 mg/kg thrice weekly. We found that only the higher dosing regimen resulted in increased haem-oxygenase-1 and heavy chain ferritin (H-ferritin) expression and decreased iron deposition in the kidney. Despite the decreased kidney iron deposition following Hp treatment, there was no significant improvement in kidney function. However, there was a nearly significant trend towards decreased liver infarction.
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Affiliation(s)
- Patricia A Shi
- Lindsley F. Kimball Research Institute, New York Blood Center, New York, NY, USA
| | - Erika Choi
- Lindsley F. Kimball Research Institute, New York Blood Center, New York, NY, USA
| | | | - Julia Nguyen
- Department of Hematology, Oncology, and Transplantation, University of Minnesota Medical School, Minneapolis, MN, USA
| | - Xinhua Guo
- Lindsley F. Kimball Research Institute, New York Blood Center, New York, NY, USA
| | - Karina Yazdanbakhsh
- Lindsley F. Kimball Research Institute, New York Blood Center, New York, NY, USA
| | - Narla Mohandas
- Lindsley F. Kimball Research Institute, New York Blood Center, New York, NY, USA
| | - Abdu I Alayash
- Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, MD, USA
| | - Elizabeth A Manci
- Department of Pathology, University of South Alabama School of Medicine, Birmingham, AL, USA
| | - John D Belcher
- Department of Hematology, Oncology, and Transplantation, University of Minnesota Medical School, Minneapolis, MN, USA
| | - Gregory M Vercellotti
- Department of Hematology, Oncology, and Transplantation, University of Minnesota Medical School, Minneapolis, MN, USA
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22
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Vercellotti GM, Zhang P, Nguyen J, Abdulla F, Chen C, Nguyen P, Nowotny C, Steer CJ, Smith A, Belcher JD. Hepatic Overexpression of Hemopexin Inhibits Inflammation and Vascular Stasis in Murine Models of Sickle Cell Disease. Mol Med 2016; 22:437-451. [PMID: 27451971 DOI: 10.2119/molmed.2016.00063] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Accepted: 07/11/2016] [Indexed: 02/02/2023] Open
Abstract
Sickle cell disease (SCD) patients have low serum hemopexin (Hpx) levels due to chronic hemolysis. We hypothesize that in SCD mice, hepatic overexpression of hemopexin will scavenge the proximal mediator of vascular activation, heme, and will inhibit inflammation and microvascular stasis. To examine the protective role of Hpx in SCD, we transplanted bone marrow from NY1DD SCD mice into Hpx™/™ or Hpx+/+ C57BL/6 mice. Dorsal skin fold chambers were implanted in week 13 post-transplant and microvascular stasis (% non-flowing venules) evaluated in response to heme infusion. Hpx™/™ sickle mice had significantly greater microvascular stasis in response to heme infusion than Hpx+/+ sickle mice (p<0.05), demonstrating the protective effect of Hpx in SCD. We utilized Sleeping Beauty (SB) transposon-mediated gene transfer to overexpress wild-type rat Hpx (wt-Hpx) in NY1DD and Townes-SS SCD mice. Control SCD mice were treated with lactated Ringer's solution (LRS) or a luciferase (Luc) plasmid. Plasma and hepatic Hpx were significantly increased compared to LRS and Luc controls. Microvascular stasis in response to heme infusion in NY1DD and Townes-SS mice overexpressing wt-Hpx had significantly less stasis than controls (p<0.05). Wt-Hpx overexpression markedly increased hepatic nuclear Nrf2 expression, HO-1 activity and protein, the heme-Hpx binding protein and scavenger receptor, CD91/LRP1 and decreased NF-κB activation. Two missense (ms)-Hpx SB-constructs that bound neither heme nor the Hpx receptor, CD91/LRP1, did not prevent heme-induced stasis. In conclusion, increasing Hpx levels in transgenic sickle mice via gene transfer activates the Nrf2/HO-1 anti-oxidant axis and ameliorates inflammation and vaso-occlusion.
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Affiliation(s)
- Gregory M Vercellotti
- Division of Hematology, Oncology and Transplantation, Department of Medicine, 420 Delaware St SE, MMC 480, University of Minnesota, Minneapolis, Minnesota, USA.,Vascular Biology Center, University of Minnesota, Minneapolis, Minnesota, USA
| | - Ping Zhang
- Division of Hematology, Oncology and Transplantation, Department of Medicine, 420 Delaware St SE, MMC 480, University of Minnesota, Minneapolis, Minnesota, USA.,Vascular Biology Center, University of Minnesota, Minneapolis, Minnesota, USA
| | - Julia Nguyen
- Division of Hematology, Oncology and Transplantation, Department of Medicine, 420 Delaware St SE, MMC 480, University of Minnesota, Minneapolis, Minnesota, USA.,Vascular Biology Center, University of Minnesota, Minneapolis, Minnesota, USA
| | - Fuad Abdulla
- Division of Hematology, Oncology and Transplantation, Department of Medicine, 420 Delaware St SE, MMC 480, University of Minnesota, Minneapolis, Minnesota, USA.,Vascular Biology Center, University of Minnesota, Minneapolis, Minnesota, USA
| | - Chunsheng Chen
- Division of Hematology, Oncology and Transplantation, Department of Medicine, 420 Delaware St SE, MMC 480, University of Minnesota, Minneapolis, Minnesota, USA.,Vascular Biology Center, University of Minnesota, Minneapolis, Minnesota, USA
| | - Phong Nguyen
- Division of Hematology, Oncology and Transplantation, Department of Medicine, 420 Delaware St SE, MMC 480, University of Minnesota, Minneapolis, Minnesota, USA.,Vascular Biology Center, University of Minnesota, Minneapolis, Minnesota, USA
| | - Carlos Nowotny
- Division of Hematology, Oncology and Transplantation, Department of Medicine, 420 Delaware St SE, MMC 480, University of Minnesota, Minneapolis, Minnesota, USA.,Vascular Biology Center, University of Minnesota, Minneapolis, Minnesota, USA
| | - Clifford J Steer
- Division of Gastroenterology, Department of Medicine, and Department of Genetics, Cell Biology and Development, 420 Delaware St SE, MMC 36, University of Minnesota, Minneapolis, Minnesota, USA
| | - Ann Smith
- Division of Molecular Biology and Biochemistry, School of Biological Sciences, University of Missouri-Kansas City, Kansas City, Missouri, USA
| | - John D Belcher
- Division of Hematology, Oncology and Transplantation, Department of Medicine, 420 Delaware St SE, MMC 480, University of Minnesota, Minneapolis, Minnesota, USA.,Vascular Biology Center, University of Minnesota, Minneapolis, Minnesota, USA
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23
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Deuel JW, Vallelian F, Schaer CA, Puglia M, Buehler PW, Schaer DJ. Different target specificities of haptoglobin and hemopexin define a sequential protection system against vascular hemoglobin toxicity. Free Radic Biol Med 2015; 89:931-43. [PMID: 26475040 DOI: 10.1016/j.freeradbiomed.2015.09.016] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Revised: 07/31/2015] [Accepted: 09/20/2015] [Indexed: 11/19/2022]
Abstract
Free hemoglobin (Hb) triggered vascular damage occurs in many hemolytic diseases, such as sickle cell disease, with an unmet need for specific therapeutic interventions. Based on clinical observations the Hb and heme scavenger proteins haptoglobin (Hp) and hemopexin (Hx) have been characterized as a sequential defense system with Hp as the primary protector and Hx as a backup when all Hp is depleted during more severe intravascular hemolysis. In this study we present a mechanistic rationale for this paradigm based on a combined biochemical and cell biological approach directed at understanding the unique roles of Hp and Hx in Hb detoxification. Using a novel in vitro model of Hb triggered endothelial damage, which recapitulates the well-characterized pathophysiologic sequence of oxyHb(Fe(2+)) transformation to ferric Hb(Fe(3+)), free heme transfer from ferric Hb(Fe(3+)) to lipoprotein and subsequent oxidative reactions in the lipophilic phase. The accumulation of toxic lipid peroxidation products liberated during oxidation reactions ultimately lead to endothelial damage characterized by a specific gene expression pattern with reduced cellular ATP and monolayer disintegration. Quantitative analysis of key chemical and biological parameters allowed us to precisely define the mechanisms and concentrations required for Hp and Hx to prevent this toxicity. In the case of Hp we defined an exponential relationship between Hp availability relative to oxyHb(Fe(2+)) and related protective activity. This exponential relationship demonstrates that large Hp quantities are required to prevent Hb toxicity. In contrast, the linear relationship between Hx concentration and protection defines a highly efficient backup scavenger system during conditions of large excess of free oxyHb(Fe(2+)) that occurs when all Hp is consumed. The diverse protective function of Hp and Hx in this model can be explained by the different target specificities of the two proteins.
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Affiliation(s)
- Jeremy W Deuel
- Division of Internal Medicine, University Hospital of Zurich, Switzerland
| | - Florence Vallelian
- Division of Internal Medicine, University Hospital of Zurich, Switzerland
| | - Christian A Schaer
- Division of Internal Medicine, University Hospital of Zurich, Switzerland
| | - Michele Puglia
- Division of Internal Medicine, University Hospital of Zurich, Switzerland; Functional Genomics Center, University of Zurich, Switzerland
| | - Paul W Buehler
- Center of Biologics Evaluation and Research (CBER), FDA, Silver Spring, Maryland, USA
| | - Dominik J Schaer
- Division of Internal Medicine, University Hospital of Zurich, Switzerland.
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24
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Voskou S, Aslan M, Fanis P, Phylactides M, Kleanthous M. Oxidative stress in β-thalassaemia and sickle cell disease. Redox Biol 2015; 6:226-239. [PMID: 26285072 PMCID: PMC4543215 DOI: 10.1016/j.redox.2015.07.018] [Citation(s) in RCA: 107] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Revised: 07/30/2015] [Accepted: 07/31/2015] [Indexed: 12/21/2022] Open
Abstract
Sickle cell disease and β-thalassaemia are inherited haemoglobinopathies resulting in structural and quantitative changes in the β-globin chain. These changes lead to instability of the generated haemoglobin or to globin chain imbalance, which in turn impact the oxidative environment both intracellularly and extracellularly. The ensuing oxidative stress and the inability of the body to adequately overcome it are, to a large extent, responsible for the pathophysiology of these diseases. This article provides an overview of the main players and control mechanisms involved in the establishment of oxidative stress in these haemoglobinopathies.
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Affiliation(s)
- S Voskou
- The Cyprus Institute of Neurology and Genetics, Nicosia, Cyprus
| | - M Aslan
- Akdeniz University, Faculty of Medicine, Department of Medical Biochemistry, Antalya, Turkey
| | - P Fanis
- The Cyprus Institute of Neurology and Genetics, Nicosia, Cyprus
| | - M Phylactides
- The Cyprus Institute of Neurology and Genetics, Nicosia, Cyprus.
| | - M Kleanthous
- The Cyprus Institute of Neurology and Genetics, Nicosia, Cyprus
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25
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Smith A, McCulloh RJ. Hemopexin and haptoglobin: allies against heme toxicity from hemoglobin not contenders. Front Physiol 2015; 6:187. [PMID: 26175690 PMCID: PMC4485156 DOI: 10.3389/fphys.2015.00187] [Citation(s) in RCA: 175] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Accepted: 06/11/2015] [Indexed: 01/29/2023] Open
Abstract
The goal here is to describe our current understanding of heme metabolism and the deleterious effects of "free" heme on immunological processes, endothelial function, systemic inflammation, and various end-organ tissues (e.g., kidney, lung, liver, etc.), with particular attention paid to the role of hemopexin (HPX). Because heme toxicity is the impetus for much of the pathology in sepsis, sickle cell disease (SCD), and other hemolytic conditions, the biological importance and clinical relevance of HPX, the predominant heme binding protein, is reinforced. A perspective on the function of HPX and haptoglobin (Hp) is presented, updating how these two proteins and their respective receptors act simultaneously to protect the body in clinical conditions that entail hemolysis and/or systemic intravascular (IVH) inflammation. Evidence from longitudinal studies in patients supports that HPX plays a Hp-independent role in genetic and non-genetic hemolytic diseases without the need for global Hp depletion. Evidence also supports that HPX has an important role in the prognosis of complex illnesses characterized predominantly by the presence of hemolysis, such as SCD, sepsis, hemolytic-uremic syndrome, and conditions involving IVH and extravascular hemolysis (EVH), such as that generated by extracorporeal circulation during cardiopulmonary bypass (CPB) and from blood transfusions. We propose that quantitating the amounts of plasma heme, HPX, Hb-Hp, heme-HPX, and heme-albumin levels in various disease states may aid in the diagnosis and treatment of the above-mentioned conditions, which is crucial to developing targeted plasma protein supplementation (i.e., "replenishment") therapies for patients with heme toxicity due to HPX depletion.
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Affiliation(s)
- Ann Smith
- School of Biological Sciences, University of Missouri-Kansas CityKansas City, MO, USA
| | - Russell J. McCulloh
- Pediatric and Adult Infectious Diseases, Children's Mercy-Kansas CityKansas City, MO, USA
- School of Medicine, University of Missouri-Kansas CityKansas City, MO, USA
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26
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Heme triggers TLR4 signaling leading to endothelial cell activation and vaso-occlusion in murine sickle cell disease. Blood 2013; 123:377-90. [PMID: 24277079 DOI: 10.1182/blood-2013-04-495887] [Citation(s) in RCA: 490] [Impact Index Per Article: 44.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Treatment of sickle cell disease (SCD) is hampered by incomplete understanding of pathways linking hemolysis to vaso-occlusion. We investigated these pathways in transgenic sickle mice. Infusion of hemoglobin or heme triggered vaso-occlusion in sickle, but not normal, mice. Methemoglobin, but not heme-stabilized cyanomethemoglobin, induced vaso-occlusion, indicating heme liberation is necessary. In corroboration, hemoglobin-induced vaso-occlusion was blocked by the methemoglobin reducing agent methylene blue, haptoglobin, or the heme-binding protein hemopexin. Untreated HbSS mice, but not HbAA mice, exhibited ∼10% vaso-occlusion in steady state that was inhibited by haptoglobin or hemopexin infusion. Antibody blockade of adhesion molecules P-selectin, von Willebrand factor (VWF), E-selectin, vascular cell adhesion molecule 1, intercellular adhesion molecule 1, platelet endothelial cell (EC) adhesion molecule 1, α4β1, or αVβ3 integrin prevented vaso-occlusion. Heme rapidly (5 minutes) mobilized Weibel-Palade body (WPB) P-selectin and VWF onto EC and vessel wall surfaces and activated EC nuclear factor κB (NF-κB). This was mediated by TLR4 as TAK-242 blocked WPB degranulation, NF-κB activation, vaso-occlusion, leukocyte rolling/adhesion, and heme lethality. TLR4(-/-) mice transplanted with TLR4(+/+) sickle bone marrow exhibited no heme-induced vaso-occlusion. The TLR4 agonist lipopolysaccharide (LPS) activated ECs and triggered vaso-occlusion that was inhibited by TAK-242, linking hemolysis- and infection-induced vaso-occlusive crises to TLR4 signaling. Heme and LPS failed to activate VWF and NF-κB in TLR4(-/-) ECs. Anti-LPS immunoglobulin G blocked LPS-induced, but not heme-induced, vaso-occlusion, illustrating LPS-independent TLR4 signaling by heme. Inhibition of protein kinase C, NADPH oxidase, or antioxidant treatment blocked heme-mediated stasis, WPB degranulation, and oxidant production. We conclude that intravascular hemolysis in SCD releases heme that activates endothelial TLR4 signaling leading to WPB degranulation, NF-κB activation, and vaso-occlusion.
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27
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Lawen A, Lane DJR. Mammalian iron homeostasis in health and disease: uptake, storage, transport, and molecular mechanisms of action. Antioxid Redox Signal 2013. [PMID: 23199217 DOI: 10.1089/ars.2011.4271] [Citation(s) in RCA: 155] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Iron is a crucial factor for life. However, it also has the potential to cause the formation of noxious free radicals. These double-edged sword characteristics demand a tight regulation of cellular iron metabolism. In this review, we discuss the various pathways of cellular iron uptake, cellular iron storage, and transport. Recent advances in understanding the reduction and uptake of non-transferrin-bound iron are discussed. We also discuss the recent progress in the understanding of transcriptional and translational regulation by iron. Furthermore, we discuss recent advances in the understanding of the regulation of cellular and systemic iron homeostasis and several key diseases resulting from iron deficiency and overload. We also discuss the knockout mice available for studying iron metabolism and the related human conditions.
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Affiliation(s)
- Alfons Lawen
- Department of Biochemistry and Molecular Biology, School of Biomedical Sciences, Monash University, Melbourne, Australia.
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28
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Buhl KJ, Berman FW, Stone DL. Reports of metaldehyde and iron phosphate exposures in animals and characterization of suspected iron toxicosis in dogs. J Am Vet Med Assoc 2013; 242:1244-8. [DOI: 10.2460/javma.242.9.1244] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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29
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Hahl P, Davis T, Washburn C, Rogers JT, Smith A. Mechanisms of neuroprotection by hemopexin: modeling the control of heme and iron homeostasis in brain neurons in inflammatory states. J Neurochem 2013; 125:89-101. [PMID: 23350672 DOI: 10.1111/jnc.12165] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2012] [Revised: 01/18/2013] [Accepted: 01/18/2013] [Indexed: 12/21/2022]
Abstract
Hemopexin provides neuroprotection in mouse models of stroke and intracerebral hemorrhage and protects neurons in vitro against heme or reactive oxygen species (ROS) toxicity via heme oxygenase-1 (HO1) activity. To model human brain neurons experiencing hemorrhages and inflammation, we used human neuroblastoma cells, heme-hemopexin complexes, and physiologically relevant ROS, for example, H(2)O(2) and HOCl, to provide novel insights into the underlying mechanism whereby hemopexin safely maintains heme and iron homeostasis. Human amyloid precursor protein (hAPP), needed for iron export from neurons, is induced ~twofold after heme-hemopexin endocytosis by iron from heme catabolism via the iron-regulatory element of hAPP mRNA. Heme-hemopexin is relatively resistant to damage by ROS and retains its ability to induce the cytoprotective HO1 after exposure to tert-butylhydroperoxide, although induction is impaired, but not eliminated, by exposure to high concentrations of H(2)O(2) in vitro. Apo-hemopexin, which predominates in non-hemolytic states, resists damage by H(2)O(2) and HOCl, except for the highest concentrations likely in vivo. Heme-albumin and albumin are preferential targets for ROS; thus, albumin protects hemopexin in biological fluids like CSF and plasma where it is abundant. These observations provide strong evidence that hemopexin will be neuroprotective after traumatic brain injury, with heme release in the CNS, and during the ensuing inflammation. Hemopexin sequesters heme, thus preventing unregulated heme uptake that leads to toxicity; it safely delivers heme to neuronal cells; and it activates the induction of proteins including HO1 and hAPP that keep heme and iron at safe levels in neurons.
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Affiliation(s)
- Peter Hahl
- School of Biological Sciences, University of Missouri - Kansas City, Kansas City, MO, USA
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30
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Hemolysis and free hemoglobin revisited: exploring hemoglobin and hemin scavengers as a novel class of therapeutic proteins. Blood 2012; 121:1276-84. [PMID: 23264591 DOI: 10.1182/blood-2012-11-451229] [Citation(s) in RCA: 576] [Impact Index Per Article: 48.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Hemolysis occurs in many hematologic and nonhematologic diseases. Extracellular hemoglobin (Hb) has been found to trigger specific pathophysiologies that are associated with adverse clinical outcomes in patients with hemolysis, such as acute and chronic vascular disease, inflammation, thrombosis, and renal impairment. Among the molecular characteristics of extracellular Hb, translocation of the molecule into the extravascular space, oxidative and nitric oxide reactions, hemin release, and molecular signaling effects of hemin appear to be the most critical. Limited clinical experience with a plasma-derived haptoglobin (Hp) product in Japan and more recent preclinical animal studies suggest that the natural Hb and the hemin-scavenger proteins Hp and hemopexin have a strong potential to neutralize the adverse physiologic effects of Hb and hemin. This includes conditions that are as diverse as RBC transfusion, sickle cell disease, sepsis, and extracorporeal circulation. This perspective reviews the principal mechanisms of Hb and hemin toxicity in different disease states, updates how the natural scavengers efficiently control these toxic moieties, and explores critical issues in the development of human plasma-derived Hp and hemopexin as therapeutics for patients with excessive intravascular hemolysis.
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31
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Hemopexin decreases hemin accumulation and catabolism by neural cells. Neurochem Int 2012; 60:488-94. [PMID: 22342655 DOI: 10.1016/j.neuint.2012.01.024] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2011] [Revised: 01/19/2012] [Accepted: 01/20/2012] [Indexed: 01/01/2023]
Abstract
Hemopexin is a serum, CSF, and neuronal protein that is protective after experimental stroke. Its efficacy in the latter has been linked to increased expression and activity of heme oxygenase (HO)-1, suggesting that it facilitates heme degradation and subsequent release of cytoprotective biliverdin and carbon monoxide. In this study, the effect of hemopexin on the rate of hemin breakdown by CNS cells was investigated in established in vitro models. Equimolar hemopexin decreased hemin breakdown, as assessed by gas chromatography, by 60-75% in primary cultures of murine neurons and glia. Extracellular hemopexin reduced cell accumulation of ⁵⁵Fe-hemin by over 90%, while increasing hemin export or extraction from membranes by fourfold. This was associated with significant reduction in HO-1 expression and neuroprotection. In a cell-free system, hemin breakdown by recombinant HO-1 was reduced over 80% by hemopexin; in contrast, albumin and two other heme-binding proteins had no effect. Although hemopexin was detected on immunoblots of cortical lysates from adult mice, hemopexin knockout per se did not alter HO activity in cortical cells treated with hemin. These results demonstrate that hemopexin decreases the accumulation and catabolism of exogenous hemin by neural cells. Its beneficial effect in stroke models is unlikely to be mediated by increased production of cytoprotective heme breakdown products.
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32
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Mauk MR, Smith A, Mauk AG. An alternative view of the proposed alternative activities of hemopexin. Protein Sci 2011; 20:791-805. [PMID: 21404362 DOI: 10.1002/pro.616] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2011] [Revised: 03/02/2011] [Accepted: 03/03/2011] [Indexed: 01/05/2023]
Abstract
Hemopexin is a plasma protein that plays a well-established biological role in sequestering heme that is released into the plasma from hemoglobin and myoglobin as the result of intravascular or extravascular hemolysis as well as from skeletal muscle trauma or neuromuscular disease. In recent years, a variety of additional biological activities have been attributed to hemopexin, for example, hyaluronidase activity, serine protease activity, pro-inflammatory and anti-inflammatory activity as well as suppression of lymphocyte necrosis, inhibition of cellular adhesion, and binding of divalent metal ions. This review examines the challenges involved in the purification of hemopexin from plasma and in the recombinant expression of hemopexin and evaluates the questions that these challenges and the characteristics of hemopexin raise concerning the validity of many of the new activities proposed for this protein. As well, an homology model of the three-dimensional structure of human hemopexin is used to reveal that the protein lacks the catalytic triad that is characteristic of many serine proteases but that hemopexin possesses two highly exposed Arg-Gly-Glu sequences that may promote interaction with cell surfaces.
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Affiliation(s)
- Marcia R Mauk
- Department of Biochemistry and Molecular Biology and the Centre for Blood Research, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z3
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33
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Tenhunen R. Heme in the treatment of heme deficiency states. Scandinavian Journal of Clinical and Laboratory Investigation 2011. [DOI: 10.1080/00365519009085802] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Morello N, Tonoli E, Logrand F, Fiorito V, Fagoonee S, Turco E, Silengo L, Vercelli A, Altruda F, Tolosano E. Haemopexin affects iron distribution and ferritin expression in mouse brain. J Cell Mol Med 2010; 13:4192-204. [PMID: 19120692 PMCID: PMC4496126 DOI: 10.1111/j.1582-4934.2008.00611.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Haemopexin (Hx) is an acute phase plasma glycoprotein, mainly produced by the liver and released into plasma where it binds heme with high affinity and delivers it to the liver. This system provides protection against free heme-mediated oxidative stress, limits access by pathogens to heme and contributes to iron homeostasis by recycling heme iron. Hx protein has been found in the sciatic nerve, skeletal muscle, retina, brain and cerebrospinal fluid (CSF). Recently, a comparative proteomic analysis has shown an increase of Hx in CSF from patients with Alzheimer’s disease, thus suggesting its involvement in heme detoxification in brain. Here, we report that Hx is synthesised in brain by the ventricular ependymal cells. To verify whether Hx is involved in heme scavenging in brain, and consequently, in the control of iron level, iron deposits and ferritin expression were analysed in cerebral regions known for iron accumulation. We show a twofold increase in the number of iron-loaded oligodendrocytes in the basal ganglia and thalamus of Hx-null mice compared to wild-type controls. Interestingly, there was no increase in H- and L-ferritin expression in these regions. This condition is common to several human neurological disorders such as Alzheimer’s disease and Parkinson’s disease in which iron loading is not associated with an adequate increase in ferritin expression. However, a strong reduction in the number of ferritin-positive cells was observed in the cerebral cortex of Hx-null animals. Consistent with increased iron deposits and inadequate ferritin expression, malondialdehyde level and Cu–Zn superoxide dismutase-1 expression were higher in the brain of Hx-null mice than in that of wild-type controls. These data demonstrate that Hx plays an important role in controlling iron distribution within brain, thus suggesting its involvement in iron-related neurodegenerative diseases.
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Affiliation(s)
- Noemi Morello
- Molecular Biotechnology Center, University of Torino, Torino, Italy
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35
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Fujita N, Nakanishi M, Mukai J, Naito Y, Ichida T, Kaito M, Yoshikawa T, Takei Y. Identification of treatment efficacy-related host factors in chronic hepatitis C by ProteinChip serum analysis. Mol Med 2010; 17:70-8. [PMID: 20927485 DOI: 10.2119/molmed.2010.00124] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2010] [Accepted: 10/04/2010] [Indexed: 01/28/2023] Open
Abstract
Recent development of proteomic array technology, including protein profiling coupling ProteinChip array with surface-enhanced laser desorption ionization time-of-flight mass spectrometry (SELDI-TOF/MS), provides a potentially powerful tool for discovery of new biomarkers by comparison of its profiles according to patient phenotypes. We used this approach to identify the host factors associated with treatment response in patients with chronic hepatitis C (CHC) receiving a 48-wk course of pegylated interferon (PEG-IFN) alpha 2b plus ribavirin (RBV). Protein profiles of pretreatment serum samples from 32 patients with genotype 1b and high viral load were conducted by SELDI-TOF/MS by using the three different ProteinChip arrays (CM10, Q10, IMAC30). Proteins showed significantly different peak intensities between sustained virological responders (SVRs), and non-SVRs were identified by chromatography, SDS-PAGE, TOF/MS and tandem mass spectrometry (MS/MS) assay. Eleven peak intensities were significantly different between SVRs and non-SVRs. The three SVR-increased peaks could be identified as two apolipoprotein (Apo) fragments and albumin and, among the eight non-SVR-increased proteins, four peaks identified as two iron-related and two fibrogenesis-related protein fragments, respectively. Multivariate analysis showed that the serum ferritin and three peak intensity values (Apo A1, hemopexin and transferrin) were independent variables associated with SVRs, and the area under the receiver operating characteristic (ROC) curves for SVR prediction by using the Apo A1/hemopexin and hemopexin/transferrin were 0.964 and 0.936. In conclusion, pretreatment serum protein profiling by SELDI-TOF/MS is variable for identification of response-related host factors, which are useful for treatment efficacy prediction in CHC receiving PEG-IFN plus RBV. Our data also may help us understand the mechanism for treatment resistance and development of more effective antiviral therapy targeted toward the modulation of lipogenesis or iron homeostasis in CHC patients.
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Affiliation(s)
- Naoki Fujita
- Department of Gastroenterology and Hepatology, Mie University Graduate School of Medicine, Mie, Japan.
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Dysfunction of the heme recycling system in heme oxygenase 1-deficient mice: effects on macrophage viability and tissue iron distribution. Blood 2010; 116:6054-62. [PMID: 20844238 DOI: 10.1182/blood-2010-03-272138] [Citation(s) in RCA: 196] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
To better understand the tissue iron overload and anemia previously reported in a human patient and mice that lack heme oxygenase-1 (HO-1), we studied iron distribution and pathology in HO-1(Hmox1)(-/-) mice. We found that resident splenic and liver macrophages were mostly absent in HO-1(-/-) mice. Erythrophagocytosis caused the death of HO-1(-/-) macrophages in in vitro experiments, supporting the hypothesis that HO-1(-/-) macrophages died of exposure to heme released on erythrophagocytosis. Rupture of HO-1(-/-) macrophages in vivo and release of nonmetabolized heme probably caused tissue inflammation. In the spleen, initial splenic enlargement progressed to red pulp fibrosis, atrophy, and functional hyposplenism in older mice, recapitulating the asplenia of an HO-1-deficient patient. We postulate that the failure of tissue macrophages to remove senescent erythrocytes led to intravascular hemolysis and increased expression of the heme and hemoglobin scavenger proteins, hemopexin and haptoglobin. Lack of macrophages expressing the haptoglobin receptor, CD163, diminished the ability of haptoglobin to neutralize circulating hemoglobin, and iron overload occurred in kidney proximal tubules, which were able to catabolize heme with HO-2. Thus, in HO-1(-/-) mammals, the reduced function and viability of erythrophagocytosing macrophages are the main causes of tissue damage and iron redistribution.
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Yang Z, Philips JD, Doty RT, Giraudi P, Ostrow JD, Tiribelli C, Smith A, Abkowitz JL. Kinetics and specificity of feline leukemia virus subgroup C receptor (FLVCR) export function and its dependence on hemopexin. J Biol Chem 2010; 285:28874-82. [PMID: 20610401 DOI: 10.1074/jbc.m110.119131] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
The feline leukemia virus subgroup C receptor (FLVCR) is a heme export protein that is required for proerythroblast survival and facilitates macrophage heme iron recycling. However, its mechanism of heme export and substrate specificity are uncharacterized. Using [(55)Fe]heme and the fluorescent heme analog zinc mesoporphyrin, we investigated whether export by FLVCR depends on the availability and avidity of extracellular heme-binding proteins. Export was 100-fold more efficient when the medium contained hemopexin (K(d) < 1 pm) compared with albumin (K(d) = 5 nm) at the same concentration and was not detectable when the medium lacked heme-binding proteins. Besides heme, FLVCR could export other cyclic planar porphyrins, such as protoporphyrin IX and coproporphyrin. However, FLVCR has a narrow substrate range because unconjugated bilirubin, the primary breakdown product of heme, was not transported. As neither protoporphyrin IX nor coproporphyrin export improved with extracellular hemopexin (versus albumin), our observations further suggest that hemopexin, an abundant protein with a serum concentration (6.7-25 mum) equivalent to that of the iron transport protein transferrin (22-31 mum), by accepting heme from FLVCR and targeting it to the liver, might regulate macrophage heme export and heme iron recycling in vivo. Final studies show that hemopexin directly interacts with FLVCR, which also helps explain why FLVCR, in contrast to some major facilitator superfamily members, does not function as a bidirectional gradient-dependent transporter. Together, these data argue that hemopexin has a role in assuring systemic iron balance during homeostasis in addition to its established role as a scavenger during internal bleeding or hemolysis.
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Affiliation(s)
- Zhantao Yang
- Division of Hematology, Department of Medicine, University of Washington, Seattle, Washington 98195-7710, USA
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Mauk MR, Mauk AG. Metal ions and electrolytes regulate the dissociation of heme from human hemopexin at physiological pH. J Biol Chem 2010; 285:20499-506. [PMID: 20430887 DOI: 10.1074/jbc.m110.123406] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The stability of the hemopexin-heme (Hx-heme) complex to dissociation of the heme prosthetic group has been examined in bicarbonate buffers in the presence and absence of various divalent metal ions. In NH(4)HCO(3) buffer (pH 7.4, 20 mm, 25 degrees C) containing Zn(2+) (100 microm), 14% of the heme dissociates from this complex (4.5 microm) within 10 min, and 50% dissociates within 2 h. In the absence of metal ions, the rate of dissociation of this complex is far lower, is decreased further in KHCO(3) solution, and is minimal in NaHCO(3). In NH(4)HCO(3) buffer, dissociation of the Hx-heme complex is accelerated by addition of divalent metals with decreasing efficiency in the order Zn(2+) > Cu(2+) >> Ni(2+) > Co(2+)>>Mn(2+). Addition of Ca(2+) prior to addition of Zn(2+) stabilizes the Hx-heme complex to dissociation of the heme group, and addition of Ca(2+) after Zn(2+)-induced dissociation of the Hx-heme complex results in re-formation of the Hx-heme complex. These effects are greatly accelerated at 37 degrees C and diminished in other buffers. Overall, the solution conditions that promote formation of the Hx-heme complex are similar to those found in blood plasma, and conditions that promote release of heme are similar to those that the Hx-heme complex should encounter in endosomes following endocytosis of the complex formed with its hepatic receptor.
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Affiliation(s)
- Marcia R Mauk
- Department of Biochemistry and Molecular Biology and the Centre for Blood Research, Life Sciences Centre, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
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Abstract
Heme is an essential molecule in aerobic organisms. Heme consists of protoporphyrin IX and a ferrous (Fe(2+)) iron atom, which has high affinity for oxygen (O(2)). Hemoglobin, the major oxygen-carrying protein in blood, is the most abundant heme-protein in animals and humans. Hemoglobin consists of four globin subunits (alpha(2)beta(2)), with each subunit carrying a heme group. Ferrous (Fe(2+)) hemoglobin is easily oxidized in circulation to ferric (Fe(3+)) hemoglobin, which readily releases free hemin. Hemin is hydrophobic and intercalates into cell membranes. Hydrogen peroxide can split the heme ring and release "free" redox-active iron, which catalytically amplifies the production of reactive oxygen species. These oxidants can oxidize lipids, proteins, and DNA; activate cell-signaling pathways and oxidant-sensitive, proinflammatory transcription factors; alter protein expression; perturb membrane channels; and induce apoptosis and cell death. Heme-derived oxidants induce recruitment of leukocytes, platelets, and red blood cells to the vessel wall; oxidize low-density lipoproteins; and consume nitric oxide. Heme metabolism, extracellular and intracellular defenses against heme, and cellular cytoprotective adaptations are emphasized. Sickle cell disease, an archetypal example of hemolysis, heme-induced oxidative stress, and cytoprotective adaptation, is reviewed.
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Affiliation(s)
- John D Belcher
- Department of Medicine, Division of Hematology, Oncology and Transplantation, Minneapolis, Minnesota 55455, USA
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Tolosano E, Fagoonee S, Morello N, Vinchi F, Fiorito V. Heme scavenging and the other facets of hemopexin. Antioxid Redox Signal 2010; 12:305-20. [PMID: 19650691 DOI: 10.1089/ars.2009.2787] [Citation(s) in RCA: 197] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Hemopexin is an acute-phase plasma glycoprotein, produced mainly by the liver and released into plasma, where it binds heme with high affinity. Other sites of hemopexin synthesis are the nervous system, skeletal muscle, retina, and kidney. The only known receptor for the heme-hemopexin complex is the scavenger receptor, LDL receptor-related protein (LRP)1, which is expressed in most cell types, thus indicating multiple sites of heme-hemopexin complex recovery. The better-characterized function of hemopexin is heme scavenging at the systemic level, consisting of the transport of heme to the liver, where it is catabolyzed or used for the synthesis of hemoproteins or exported to bile canaliculi. This is important both in physiologic heme management for heme-iron recycling and in pathologic conditions associated with intravascular hemolysis to prevent the prooxidant and proinflammatory effects of heme. Other than scavenging heme, the heme-hemopexin complex has been shown to be able to activate signaling pathways, thus promoting cell survival, and to modulate gene expression. In this review, the importance of heme scavenging by hemopexin, as well as the other emerging functions of this protein, are discussed.
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Affiliation(s)
- Emanuela Tolosano
- Molecular Biotechnology Center, University of Torino, Torino, Italy.
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Smith A, Rish KR, Lovelace R, Hackney JF, Helston RM. Role for copper in the cellular and regulatory effects of heme-hemopexin. Biometals 2008; 22:421-37. [DOI: 10.1007/s10534-008-9178-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2008] [Accepted: 11/04/2008] [Indexed: 10/21/2022]
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Abstract
The liver plays a central role in iron metabolism. It is the major storage site for iron and also expresses a complex range of molecules which are involved in iron transport and regulation of iron homeostasis. An increasing number of genes associated with hepatic iron transport or regulation have been identified. These include transferrin receptors (TFR1 and 2), a ferrireductase (STEAP3), the transporters divalent metal transporter-1 (DMT1) and ferroportin (FPN) as well as the haemochromatosis protein, HFE and haemojuvelin (HJV), which are signalling molecules. Many of these genes also participate in iron regulatory pathways which focus on the hepatic peptide hepcidin. However, we are still only beginning to understand the complex interactions between liver iron transport and iron homeostasis. This review outlines our current knowledge of molecules of iron metabolism and their roles in iron transport and regulation of iron homeostasis.
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Affiliation(s)
- Ross-M Graham
- School of Medicine and Pharmacology, Fremantle Hospital, University of Western Australia, PO Box 480, Fremantle 6959, Western Australia, Australia
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Flaherty MM, Rish KR, Smith A, Crumbliss AL. An investigation of hemopexin redox properties by spectroelectrochemistry: biological relevance for heme uptake. Biometals 2007; 21:239-48. [PMID: 17712531 DOI: 10.1007/s10534-007-9112-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2007] [Accepted: 07/26/2007] [Indexed: 10/22/2022]
Abstract
Hemopexin (HPX) has two principal roles: it sequesters free heme in vivo for the purpose of preventing the toxic effects of this moiety, which is largely due to heme's ability to catalyze free radical formation, and it transports heme intracellularly thus limiting its availability as an iron source for pathogens. Spectroelectrochemistry was used to determine the redox potential for heme and meso-heme (mH) when bound by HPX. At pH 7.2, the heme-HPX assembly exhibits E (1/2) values in the range 45-90 mV and the mH-HPX assembly in the range 5-55 mV, depending on environmental electrolyte identity. The E (1/2) value exhibits a 100 mV positive shift with a change in pH from 7.2 to 5.5 for mH-HPX, suggesting a single proton dependent equilibrium. The E (1/2) values for heme-HPX are more positive in the presence of NaCl than KCl indicating that Na(+), as well as low pH (5.5) stabilizes ferro-heme-HPX. Furthermore, comparing KCl with K(2)HPO(4), the chloride salt containing system has a lower potential, indicating that heme-HPX is easier to oxidize. These physical properties related to ferri-/ferro-heme reduction are both structurally and biologically relevant for heme release from HPX for transport and regulation of heme oxygenase expression. Consistent with this, when the acidification of endosomes is prevented by bafilomycin then heme oxygenase-1 induction by heme-HPX no longer occurs.
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Affiliation(s)
- Meghan M Flaherty
- Department of Chemistry, Duke University, Box 90346, Durham, NC 27708-0346, USA
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Rish KR, Swartzlander R, Sadikot TN, Berridge MV, Smith A. Interaction of heme and heme-hemopexin with an extracellular oxidant system used to measure cell growth-associated plasma membrane electron transport. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2007; 1767:1107-17. [PMID: 17643387 DOI: 10.1016/j.bbabio.2007.06.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2006] [Revised: 06/12/2007] [Accepted: 06/13/2007] [Indexed: 11/18/2022]
Abstract
Since redox active metals are often transported across membranes into cells in the reduced state, we have investigated whether exogenous ferri-heme or heme bound to hemopexin (HPX), which delivers heme to cells via receptor-mediated endocytosis, interact with a cell growth-associated plasma membrane electron transport (PMET) pathway. PMET reduces the cell-impermeable tetrazolium salt, WST-1, in the presence of the mandatory low potential intermediate electron acceptor, mPMS. In human promyelocytic (HL60) cells, protoheme (iron protoporphyrin IX; 2,4-vinyl), mesoheme (2,4-ethyl) and deuteroheme (2,4-H) inhibited reduction of WST-1/mPMS in a saturable manner supporting interaction with a finite number of high affinity acceptor sites (Kd 221 nM for naturally occurring protoheme). A requirement for the redox-active iron was shown using gallium-protoporphyrin IX (PPIX) and tin-PPIX. Heme-hemopexin, but not apo-hemopexin, also inhibited WST-1 reduction, and copper was required. Importantly, since neither heme nor heme-hemopexin replace mPMS as an intermediate electron acceptor and since inhibition of WST-1/mPMS reduction requires living cells, the experimental evidence supports the view that heme and heme-hemopexin interact with electrons from PMET. We therefore propose that heme and heme-hemopexin are natural substrates for this growth-associated electron transfer across the plasma membrane.
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Affiliation(s)
- Kimberly R Rish
- School of Biological Sciences, University of Missouri-Kansas City, 5007 Rockhill Road, Kansas City, MO 64110-2499, USA
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Skaar EP, Humayun M, Bae T, DeBord KL, Schneewind O. Iron-source preference of Staphylococcus aureus infections. Science 2004; 305:1626-8. [PMID: 15361626 DOI: 10.1126/science.1099930] [Citation(s) in RCA: 310] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Although bacteria use different iron compounds in vitGro, the possibility that microbes distinguish between these iron sources during infection has hitherto not been examined. We applied stable isotope labeling to detect source-specific iron by mass spectrometry and show that Staphylococcus aureus preferentially imports heme iron over transferrin iron. By combining this approach with computational genome analysis, we identified hts (heme transport system), a gene cluster that promotes preferred heme iron import by S. aureus. Heme iron scavenging by means of hts is required for staphylococcal pathogenesis in animal hosts, indicating that heme iron is the preferred iron source during the initiation of infection.
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Affiliation(s)
- Eric P Skaar
- Committee on Microbiology, 920 East 58th Street, University of Chicago, Chicago, IL 60637, USA
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Bui L, Rish K, Jaronczyk K, Bourque S, McLaughlin BE, Brien JF, Marks GS, Smith A, Nakatsu K. The source of heme for vascular heme oxygenase I: heme uptake in rat aorta. Can J Physiol Pharmacol 2004; 82:209-17. [PMID: 15181458 DOI: 10.1139/y04-014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
During the last decade, heme oxygenase (HO) and carbon monoxide (CO) have garnered substantial research interest in terms of cell and organ regulation, especially as they bear on the central nervous system, organ transplantation, and the cardiovascular system. While the enzymatic mechanism, substrates, and products of HO are well known, it is not clear whether the cardiovascular system derives its supply of the heme substrate through de novo synthesis or uptake from the extracellular milieu. The objective of the present study was to test the latter possibility in rat aorta and to determine the influence of plasma proteins that bind heme in vivo, viz. hemopexin and albumin. Aortic tissue was exposed to [14C]heme in vitro, and the concentration and time dependence of heme uptake was assessed. The presence of hemopexin or albumin in the incubation medium dramatically decreased heme uptake by the aorta. Heme uptake by aortic tissue was not altered after induction of HO-1, which would be expected to increase tissue heme demand. In summary, the rat, isolated aorta was capable of obtaining heme from its external milieu, but this was obtunded in the presence of the plasma proteins hemopexin or albumin. For normal physiological situations, heme uptake may not be a usual source of substrate for vascular HO and hemoenzymes such as nitric oxide synthase, soluble guanylyl cyclase, and cyclooxygenase.Key words: heme uptake, vasculature, heme oxygenase, hemopexin.
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MESH Headings
- Animals
- Aorta, Thoracic/cytology
- Aorta, Thoracic/drug effects
- Aorta, Thoracic/metabolism
- Canada
- Carbon Radioisotopes
- Heme/metabolism
- Heme Oxygenase (Decyclizing)/drug effects
- Heme Oxygenase (Decyclizing)/metabolism
- Heme Oxygenase-1
- Hemopexin/pharmacology
- Male
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- Rats
- Rats, Sprague-Dawley
- S-Nitroso-N-Acetylpenicillamine/pharmacology
- Serum Albumin/pharmacology
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Affiliation(s)
- Loc Bui
- Department of Pharmacology and Toxicology, Queen's University, Kingston, ON, Canada
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Paiva-Silva GO, Sorgine MHF, Benedetti CE, Meneghini R, Almeida IC, Machado EA, Dansa-Petretski M, Yepiz-Plascencia G, Law JH, Oliveira PL, Masuda H. On the biosynthesis of Rhodnius prolixus heme-binding protein. INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2002; 32:1533-1541. [PMID: 12530221 DOI: 10.1016/s0965-1748(02)00074-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The biosynthesis of Rhodnius prolixus heme-binding protein (RHBP), which is present in the hemolymph and oocytes of Rhodnius prolixus, was investigated. Fat bodies of female insects incubated in vitro with 14C-leucine were able to synthesize and secrete 14C-RHBP to the culture medium. Titrtion of synthesized RHBP with hemin showed that the protein secreted by the fat bodies is bound to heme, despite the presence of apo-RHBP in the hemolymph. The sequence of the RHBP cDNA encodes a pre-protein of 128 amino acids with no significant homology to any known protein. Northern-blot assays revealed that RHBP expression was limited to fat bodies. The levels of both RHBP mRNA and secreted protein increased in response to blood meal. In addition, the time-course of RHBP secretion in vitro paralleled mRNA accumulation observed in vivo. The inhibition of the de novo heme biosynthesis by treatment of fat bodies with succinyl acetone (SA), an irreversible inhibitor of delta-aminolevulinic acid-dehydratase, led to a significant decrease of heme-RHBP secretion. Nevertheless, the levels of RHBP mRNA were not modified by SA treatment, suggesting that the heme availability is involved in a post-transcriptional control of the RHBP synthesis.
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Affiliation(s)
- G O Paiva-Silva
- Departamento de Bioquímica Médica, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, CEP 21941-590, Rio de Janeiro, RJ, Brazil.
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48
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Escriba PV, Morales P, Smith A. Membrane phospholipid reorganization differentially regulates metallothionein and heme oxygenase by heme-hemopexin. DNA Cell Biol 2002; 21:355-64. [PMID: 12042074 DOI: 10.1089/104454902753759762] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Heme-hemopexin coordinately regulates genes encoding protective proteins including metallothionein-I (MT-I) and heme oxygenase 1 (HO-1). Hexamethylene-bisacetamide (HMBA), which induces differentiation and activates protein kinase C (PKC), synergistically augments the induction of both MT-I and MT-II mRNAs in response to heme-hemopexin, but attenuates the induction of HO-1. HMBA also augments the increase in MT mRNA in response to cobalt protoporphyrin-hemopexin, a hemopexin (HPX) receptor ligand that activates signaling cascades without tetrapyrrole uptake. Unlike the PKC-activating phorbol esters that induce MT-I and HO-1, HMBA has minimal effects on MT-I or HO-1. HMBA is an amphipathic molecule, and is shown here to interact physically with lipids in model membranes using differential scanning calorimetry (DSC). The data are consistent with a stabilization of the lipid bilayer and an HMBA-induced segregation of lipids into separate domains each relatively enriched in one of the lipids. HMBA also perturbs membrane-protein interactions, and causes a loss of PKC and G-protein subunits from plasma membranes in vitro. Taken together, these observations reveal an additional level of complexity in the regulation of protective proteins induced by HPX, and which may take place in vivo in response to natural compounds that reorganize membrane phospholipids. A model is proposed whereby a reorganization of lipids by HMBA alters signaling pathways and fusion events considered to be the etiology of the differential response of the MT-1 (and MT-II) and the HO-1 genes to HMBA and heme-HPX.
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Affiliation(s)
- Pablo V Escriba
- Department of Biology, University of the Balearic Islands, 07071 Palma de Mallorca, Spain
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Smith A. Homeostasis of heme in health and disease: current aspects of the structural biology of heme-protein interactions and of gene regulation. DNA Cell Biol 2002; 21:245-9. [PMID: 12042064 DOI: 10.1089/104454902753759663] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Delanghe JR, Langlois MR. Hemopexin: a review of biological aspects and the role in laboratory medicine. Clin Chim Acta 2001; 312:13-23. [PMID: 11580905 DOI: 10.1016/s0009-8981(01)00586-1] [Citation(s) in RCA: 178] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
BACKGROUND Hemopexin is a heme-binding plasma glycoprotein which, after haptoglobin, forms the second line of defense against hemoglobin-mediated oxidative damage during intravascular hemolysis. A decrease in plasma hemopexin concentration reflects a recent release of heme compounds in the extracellular compartment. Heme-hemopexin complexes are delivered to hepatocytes by receptor-mediated endocytosis after which hemopexin is recycled to the circulation. METHODS OF ANALYSIS Immunonephelometric and -turbidimetric hemopexin assays are available as more precise and rapid alternatives to the radial immunodiffusion technique. INTERPRETATIONS Hemopexin determinations are not subject to interference by in vitro hemolysis. Altered serum or plasma concentrations of hemopexin are found not only in hemolytic anemias but also in other conditions such as chronic neuromuscular diseases and acute intermittent porphyria. In laboratory medicine, while hemopexin determination in tandem with haptoglobin has potential applications in the assessment of intravascular hemolysis and allows for the monitoring of the severity of hemolysis after depletion of haptoglobin, its diagnostic utility is less clear in other pathological conditions. Further studies are necessary to fully establish the clinical significance of hemopexin determination.
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Affiliation(s)
- J R Delanghe
- Department of Clinical Chemistry, Ghent University Hospital, De Pintelaan 185, B-9000, Ghent, Belgium.
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