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Mistretta M, Fiorito V, Allocco AL, Ammirata G, Hsu MY, Digiovanni S, Belicchi M, Napoli L, Ripolone M, Trombetta E, Mauri P, Farini A, Meregalli M, Villa C, Porporato PE, Miniscalco B, Crich SG, Riganti C, Torrente Y, Tolosano E. Flvcr1a deficiency promotes heme-based energy metabolism dysfunction in skeletal muscle. Cell Rep 2024; 43:113854. [PMID: 38412099 DOI: 10.1016/j.celrep.2024.113854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 12/07/2023] [Accepted: 02/08/2024] [Indexed: 02/29/2024] Open
Abstract
The definition of cell metabolic profile is essential to ensure skeletal muscle fiber heterogeneity and to achieve a proper equilibrium between the self-renewal and commitment of satellite stem cells. Heme sustains several biological functions, including processes profoundly implicated with cell metabolism. The skeletal muscle is a significant heme-producing body compartment, but the consequences of impaired heme homeostasis on this tissue have been poorly investigated. Here, we generate a skeletal-muscle-specific feline leukemia virus subgroup C receptor 1a (FLVCR1a) knockout mouse model and show that, by sustaining heme synthesis, FLVCR1a contributes to determine the energy phenotype in skeletal muscle cells and to modulate satellite cell differentiation and muscle regeneration.
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Affiliation(s)
- Miriam Mistretta
- Neurology Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
| | - Veronica Fiorito
- Molecular Biotechnology Center (MBC) "Guido Tarone", Department of Molecular Biotechnology and Health Sciences, University of Torino, 10126 Torino, Italy
| | - Anna Lucia Allocco
- Molecular Biotechnology Center (MBC) "Guido Tarone", Department of Molecular Biotechnology and Health Sciences, University of Torino, 10126 Torino, Italy
| | - Giorgia Ammirata
- Molecular Biotechnology Center (MBC) "Guido Tarone", Department of Molecular Biotechnology and Health Sciences, University of Torino, 10126 Torino, Italy
| | - Myriam Y Hsu
- Molecular Biotechnology Center (MBC) "Guido Tarone", Department of Molecular Biotechnology and Health Sciences, University of Torino, 10126 Torino, Italy
| | - Sabrina Digiovanni
- Molecular Biotechnology Center (MBC) "Guido Tarone", Department of Oncology, University of Torino, 10126 Torino, Italy
| | - Marzia Belicchi
- Stem Cell Laboratory, Department of Pathophysiology and Transplantation, Dino Ferrari Centre, Università degli Studi di Milano, 20122 Milan, Italy
| | - Laura Napoli
- Neuromuscular and Rare Diseases Unit, Department of Neuroscience, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
| | - Michela Ripolone
- Neuromuscular and Rare Diseases Unit, Department of Neuroscience, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
| | - Elena Trombetta
- Flow Cytometry Service, Clinical Pathology, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
| | - PierLuigi Mauri
- National Research Council of Italy, Proteomics and Metabolomics Unit, Institute for Biomedical Technologies, ITB-CNR, 20054 Segrate, Milan, Italy; Clinical Proteomics Laboratory c/o ITB-CNR, CNR.Biomics Infrastructure, ElixirNextGenIT, 20054 Segrate, Milan, Italy
| | - Andrea Farini
- Neurology Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
| | - Mirella Meregalli
- Stem Cell Laboratory, Department of Pathophysiology and Transplantation, Dino Ferrari Centre, Università degli Studi di Milano, 20122 Milan, Italy
| | - Chiara Villa
- Stem Cell Laboratory, Department of Pathophysiology and Transplantation, Dino Ferrari Centre, Università degli Studi di Milano, 20122 Milan, Italy
| | - Paolo Ettore Porporato
- Molecular Biotechnology Center (MBC) "Guido Tarone", Department of Molecular Biotechnology and Health Sciences, University of Torino, 10126 Torino, Italy
| | - Barbara Miniscalco
- Department of Veterinary Sciences, University of Torino, 10095 Grugliasco, Torino, Italy
| | - Simonetta Geninatti Crich
- Molecular Biotechnology Center (MBC) "Guido Tarone", Department of Molecular Biotechnology and Health Sciences, University of Torino, 10126 Torino, Italy
| | - Chiara Riganti
- Molecular Biotechnology Center (MBC) "Guido Tarone", Department of Oncology, University of Torino, 10126 Torino, Italy
| | - Yvan Torrente
- Neurology Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy; Stem Cell Laboratory, Department of Pathophysiology and Transplantation, Dino Ferrari Centre, Università degli Studi di Milano, 20122 Milan, Italy.
| | - Emanuela Tolosano
- Molecular Biotechnology Center (MBC) "Guido Tarone", Department of Molecular Biotechnology and Health Sciences, University of Torino, 10126 Torino, Italy.
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Pan S, Hale AT, Lemieux ME, Raval DK, Garton TP, Sadler B, Mahaney KB, Strahle JM. Iron homeostasis and post-hemorrhagic hydrocephalus: a review. Front Neurol 2024; 14:1287559. [PMID: 38283681 PMCID: PMC10811254 DOI: 10.3389/fneur.2023.1287559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2023] [Accepted: 11/21/2023] [Indexed: 01/30/2024] Open
Abstract
Iron physiology is regulated by a complex interplay of extracellular transport systems, coordinated transcriptional responses, and iron efflux mechanisms. Dysregulation of iron metabolism can result in defects in myelination, neurotransmitter synthesis, and neuronal maturation. In neonates, germinal matrix-intraventricular hemorrhage (GMH-IVH) causes iron overload as a result of blood breakdown in the ventricles and brain parenchyma which can lead to post-hemorrhagic hydrocephalus (PHH). However, the precise mechanisms by which GMH-IVH results in PHH remain elusive. Understanding the molecular determinants of iron homeostasis in the developing brain may lead to improved therapies. This manuscript reviews the various roles iron has in brain development, characterizes our understanding of iron transport in the developing brain, and describes potential mechanisms by which iron overload may cause PHH and brain injury. We also review novel preclinical treatments for IVH that specifically target iron. Understanding iron handling within the brain and central nervous system may provide a basis for preventative, targeted treatments for iron-mediated pathogenesis of GMH-IVH and PHH.
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Affiliation(s)
- Shelei Pan
- Department of Neurosurgery, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, United States
| | - Andrew T. Hale
- Department of Neurosurgery, University of Alabama at Birmingham School of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Mackenzie E. Lemieux
- Department of Neurosurgery, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, United States
| | - Dhvanii K. Raval
- Department of Neurosurgery, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, United States
| | - Thomas P. Garton
- Department of Neurology, Johns Hopkins University School of Medicine, Johns Hopkins University, Baltimore, MD, United States
| | - Brooke Sadler
- Department of Pediatrics, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, United States
- Department of Hematology and Oncology, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, United States
| | - Kelly B. Mahaney
- Department of Neurosurgery, Stanford University School of Medicine, Stanford University, Palo Alto, CA, United States
| | - Jennifer M. Strahle
- Department of Neurosurgery, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, United States
- Department of Pediatrics, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, United States
- Department of Orthopedic Surgery, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, United States
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Muk T, Stensballe A, Dmytriyeva O, Brunse A, Jiang PP, Thymann T, Sangild PT, Pankratova S. Differential Brain and Cerebrospinal Fluid Proteomic Responses to Acute Prenatal Endotoxin Exposure. Mol Neurobiol 2022; 59:2204-2218. [PMID: 35064541 DOI: 10.1007/s12035-022-02753-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Accepted: 01/17/2022] [Indexed: 12/12/2022]
Abstract
Chorioamnionitis (CA) is a risk factor for preterm birth and is associated with neurodevelopmental delay and cognitive disorders. Prenatal inflammation-induced brain injury may resolve during the immediate postnatal period when rapid brain remodeling occurs. Cerebrospinal fluid (CSF) collected at birth may be a critical source of predictive biomarkers. Using pigs as a model of preterm infants exposed to CA, we hypothesized that prenatal lipopolysaccharide (LPS) exposure induces proteome changes in the CSF and brain at birth and postnatally. Fetal piglets (103 days gestation of full-term at 117 days) were administered intra-amniotic (IA) lipopolysaccharide (LPS) 3 days before preterm delivery by caesarian section. CSF and brain tissue were collected on postnatal Days 1 and 5 (P1 and P5). CSF and hippocampal proteins were profiled by LC-MS-based quantitative proteomics. Neuroinflammatory responses in the cerebral cortex, periventricular white matter and hippocampus were evaluated by immunohistochemistry, and gene expression was evaluated by qPCR. Pigs exposed to LPS in utero showed changes in CSF protein levels at birth but not at P5. Complement protein C3, hemopexin, vasoactive intestinal peptide, carboxypeptidase N subunit 2, ITIH1, and plasminogen expression were upregulated in the CSF, while proteins associated with axon growth and synaptic functions (FGFR1, BASP1, HSPD1, UBER2N, and RCN2), adhesion (talin1), and neuronal survival (Atox1) were downregulated. Microglia, but not astrocytes, were activated by LPS at P5 in the hippocampus but not in other brain regions. At this time, marginal increases in complement protein C3, LBP, HIF1a, Basp1, Minpp1, and FGFR1 transcription indicated hippocampal proinflammatory responses. In conclusion, few days exposure to endotoxin prenatally induce proteome changes in the CSF and brain at birth, but most changes resolve a few days later. The developing hippocampus has high neuronal plasticity in response to perinatal inflammation. Changes in CSF protein expression at birth may predict later structural brain damage in preterm infants exposed to variable types and durations of CA-related inflammation in utero.
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Affiliation(s)
- Tik Muk
- Section of Comparative Pediatrics and Nutrition, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Allan Stensballe
- Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
| | - Oksana Dmytriyeva
- Faculty of Health and Medical Sciences, Novo Nordisk Foundation Center for Basic Metabolic Research, University of Copenhagen, Copenhagen, Denmark
| | - Anders Brunse
- Section of Comparative Pediatrics and Nutrition, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Ping-Ping Jiang
- Section of Comparative Pediatrics and Nutrition, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Thomas Thymann
- Section of Comparative Pediatrics and Nutrition, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Per Torp Sangild
- Section of Comparative Pediatrics and Nutrition, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.,Department of Pediatrics and Adolescent Medicine, Rigshospitalet, Copenhagen, Denmark.,Department of Paediatrics, Odense University Hospital, Odense, Denmark
| | - Stanislava Pankratova
- Section of Comparative Pediatrics and Nutrition, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark. .,Comparative Pediatrics and Nutrition, Department of Veterinary and Animal Sciences, University of Copenhagen, 1870, Frederiksberg C, Denmark.
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Rahman MM, Lendel C. Extracellular protein components of amyloid plaques and their roles in Alzheimer's disease pathology. Mol Neurodegener 2021; 16:59. [PMID: 34454574 PMCID: PMC8400902 DOI: 10.1186/s13024-021-00465-0] [Citation(s) in RCA: 46] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2020] [Accepted: 06/11/2021] [Indexed: 12/20/2022] Open
Abstract
Alzheimer's disease (AD) is pathologically defined by the presence of fibrillar amyloid β (Aβ) peptide in extracellular senile plaques and tau filaments in intracellular neurofibrillary tangles. Extensive research has focused on understanding the assembly mechanisms and neurotoxic effects of Aβ during the last decades but still we only have a brief understanding of the disease associated biological processes. This review highlights the many other constituents that, beside Aβ, are accumulated in the plaques, with the focus on extracellular proteins. All living organisms rely on a delicate network of protein functionality. Deposition of significant amounts of certain proteins in insoluble inclusions will unquestionably lead to disturbances in the network, which may contribute to AD and copathology. This paper provide a comprehensive overview of extracellular proteins that have been shown to interact with Aβ and a discussion of their potential roles in AD pathology. Methods that can expand the knowledge about how the proteins are incorporated in plaques are described. Top-down methods to analyze post-mortem tissue and bottom-up approaches with the potential to provide molecular insights on the organization of plaque-like particles are compared. Finally, a network analysis of Aβ-interacting partners with enriched functional and structural key words is presented.
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Affiliation(s)
- M Mahafuzur Rahman
- Department of Chemistry, KTH Royal Institute of Technology, SE-100 44, Stockholm, Sweden.
| | - Christofer Lendel
- Department of Chemistry, KTH Royal Institute of Technology, SE-100 44, Stockholm, Sweden.
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Yin X, Li X, Chen N, Mu L, Wu H, Yang Y, Han K, Huang Y, Wang B, Jian J, Wang A, Ye J. Hemopexin as an acute phase protein regulates the inflammatory response against bacterial infection of Nile tilapia (Oreochromis niloticus). Int J Biol Macromol 2021; 187:166-178. [PMID: 34298052 DOI: 10.1016/j.ijbiomac.2021.07.109] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 06/30/2021] [Accepted: 07/16/2021] [Indexed: 11/18/2022]
Abstract
Hemopexin, a high affinity heme-binding protein is widely involved in variety physiological and pathological processes. It is an important acute phase response protein, and is important in regulating the inflammatory response. In this study, the open reading frame of Nile tilapia hemopexin (OnHpx) gene was amplified. The expression pattern of OnHpx in natural and bacterial challenged tilapia tissues were analyzed through RT-qPCR. The results indicated the OnHpx was most abundant in liver, and increased significantly in liver, spleen, head kidney and peripheral blood after bacterial challenge. Furthermore, the OnHpx mRNA was also significantly up-regulated in monocytes/macrophages and hepatocytes under the stimulation of S. agalactiae or A. hydrophila. In addition, the recombinant OnHpx protein could effectively reduce the bacteria proliferation and alleviate the inflammatory reaction caused by bacteria. Moreover, the (r)OnHpx also regulated the respiratory burst of monocytes/macrophages and played an important role in the antioxidant process. To our knowledge, these results provide the first evidence on the antibacterial and anti-inflammatory response mechanism of Hpx in early vertebrates. This brings new insights about the understanding of the evolutionary origins and ancient roles of the Hpx in the innate immune defense.
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Affiliation(s)
- Xiaoxue Yin
- School of Life Sciences, South China Normal University, Institute of Modern Aquaculture Science and Engineering, Guangdong Provincial Key Laboratory for Healthy and Safe Aquaculture, Guangzhou 510631, PR China
| | - Xiaoyu Li
- College of Life Science and Bioengineering, Beijing University of Technology, Beijing 100124, PR China; State Key Laboratory of Proteomics, Beijing Proteome Research Center, Beijing Institute of Life Omics, Beijing 102206, PR China
| | - Nuo Chen
- School of Life Sciences, South China Normal University, Institute of Modern Aquaculture Science and Engineering, Guangdong Provincial Key Laboratory for Healthy and Safe Aquaculture, Guangzhou 510631, PR China
| | - Liangliang Mu
- School of Life Sciences, South China Normal University, Institute of Modern Aquaculture Science and Engineering, Guangdong Provincial Key Laboratory for Healthy and Safe Aquaculture, Guangzhou 510631, PR China.
| | - Hairong Wu
- School of Life Sciences, South China Normal University, Institute of Modern Aquaculture Science and Engineering, Guangdong Provincial Key Laboratory for Healthy and Safe Aquaculture, Guangzhou 510631, PR China
| | - Yanjian Yang
- School of Life Sciences, South China Normal University, Institute of Modern Aquaculture Science and Engineering, Guangdong Provincial Key Laboratory for Healthy and Safe Aquaculture, Guangzhou 510631, PR China
| | - Kailiang Han
- School of Life Sciences, South China Normal University, Institute of Modern Aquaculture Science and Engineering, Guangdong Provincial Key Laboratory for Healthy and Safe Aquaculture, Guangzhou 510631, PR China
| | - Yu Huang
- Guangdong South China Sea Key Laboratory of Aquaculture for Aquatic Economic Animals, Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animals, Guangdong Ocean University, Zhanjiang 524088, PR China
| | - Bei Wang
- Guangdong South China Sea Key Laboratory of Aquaculture for Aquatic Economic Animals, Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animals, Guangdong Ocean University, Zhanjiang 524088, PR China
| | - Jichang Jian
- Guangdong South China Sea Key Laboratory of Aquaculture for Aquatic Economic Animals, Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animals, Guangdong Ocean University, Zhanjiang 524088, PR China
| | - Anli Wang
- School of Life Sciences, South China Normal University, Institute of Modern Aquaculture Science and Engineering, Guangdong Provincial Key Laboratory for Healthy and Safe Aquaculture, Guangzhou 510631, PR China
| | - Jianmin Ye
- School of Life Sciences, South China Normal University, Institute of Modern Aquaculture Science and Engineering, Guangdong Provincial Key Laboratory for Healthy and Safe Aquaculture, Guangzhou 510631, PR China.
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Strahle JM, Mahaney KB, Morales DM, Buddhala C, Shannon CN, Wellons JC, Kulkarni AV, Jensen H, Reeder RW, Holubkov R, Riva-Cambrin JK, Whitehead WE, Rozzelle CJ, Tamber M, Pollack IF, Naftel RP, Kestle JRW, Limbrick DD. Longitudinal CSF Iron Pathway Proteins in Posthemorrhagic Hydrocephalus: Associations with Ventricle Size and Neurodevelopmental Outcomes. Ann Neurol 2021; 90:217-226. [PMID: 34080727 DOI: 10.1002/ana.26133] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 04/27/2021] [Accepted: 05/15/2021] [Indexed: 11/06/2022]
Abstract
OBJECTIVE Iron has been implicated in the pathogenesis of brain injury and hydrocephalus after preterm germinal matrix hemorrhage-intraventricular hemorrhage, however, it is unknown how external or endogenous intraventricular clearance of iron pathway proteins affect the outcome in this group. METHODS This prospective multicenter cohort included patients with posthemorrhagic hydrocephalus (PHH) who underwent (1) temporary and permanent cerebrospinal fluid (CSF) diversion and (2) Bayley Scales of Infant Development-III testing around 2 years of age. CSF proteins in the iron handling pathway were analyzed longitudinally and compared to ventricle size and neurodevelopmental outcomes. RESULTS Thirty-seven patients met inclusion criteria with a median estimated gestational age at birth of 25 weeks; 65% were boys. Ventricular CSF levels of hemoglobin, iron, total bilirubin, and ferritin decreased between temporary and permanent CSF diversion with no change in CSF levels of ceruloplasmin, transferrin, haptoglobin, and hepcidin. There was an increase in CSF hemopexin during this interval. Larger ventricle size at permanent CSF diversion was associated with elevated CSF ferritin (p = 0.015) and decreased CSF hemopexin (p = 0.007). CSF levels of proteins at temporary CSF diversion were not associated with outcome, however, higher CSF transferrin at permanent CSF diversion was associated with improved cognitive outcome (p = 0.015). Importantly, longitudinal change in CSF iron pathway proteins, ferritin (decrease), and transferrin (increase) were associated with improved cognitive (p = 0.04) and motor (p = 0.03) scores and improved cognitive (p = 0.04), language (p = 0.035), and motor (p = 0.008) scores, respectively. INTERPRETATION Longitudinal changes in CSF transferrin (increase) and ferritin (decrease) are associated with improved neurodevelopmental outcomes in neonatal PHH, with implications for understanding the pathogenesis of poor outcomes in PHH. ANN NEUROL 2021;90:217-226.
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Affiliation(s)
- Jennifer M Strahle
- Department of Neurosurgery, Washington University St. Louis, St. Louis, MO, USA
| | - Kelly B Mahaney
- Department of Neurosurgery, Stanford University, Palo Alto, CA, USA
| | - Diego M Morales
- Department of Neurosurgery, Washington University St. Louis, St. Louis, MO, USA
| | - Chandana Buddhala
- Department of Neurosurgery, Washington University St. Louis, St. Louis, MO, USA
| | - Chevis N Shannon
- Department of Neurosurgery, Vanderbilt University Medical Center, Nashville, TN, USA
| | - John C Wellons
- Department of Neurosurgery, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Abhaya V Kulkarni
- Department of Neurosurgery, University of Toronto, Toronto, Ontario, Canada
| | - Hailey Jensen
- Data Coordinating Center, University of Utah, Salt Lake City, UT, USA
| | - Ron W Reeder
- Data Coordinating Center, University of Utah, Salt Lake City, UT, USA
| | - Richard Holubkov
- Data Coordinating Center, University of Utah, Salt Lake City, UT, USA
| | - Jay K Riva-Cambrin
- Department of Clinical Neurosciences, University of Calgary, Calgary, Alberta, Canada
| | | | - Curtis J Rozzelle
- Department of Neurosurgery, University of Alabama - Birmingham, Birmingham, AL, USA
| | - Mandeep Tamber
- Department of Surgery, University of British Columbia, Vancouver, British Columbia, Canada
| | - Ian F Pollack
- Department of Neurosurgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA
| | - Robert P Naftel
- Department of Neurosurgery, Vanderbilt University Medical Center, Nashville, TN, USA
| | - John R W Kestle
- Department of Neurosurgery, University of Utah, Salt Lake City, UT, USA
| | - David D Limbrick
- Department of Neurosurgery, Washington University St. Louis, St. Louis, MO, USA
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Pettway YD, Neder TH, Ho DH, Fox BM, Burch M, Colson J, Liu X, Kellum CE, Hyndman KA, Pollock JS. Early life stress induces dysregulation of the heme pathway in adult mice. Physiol Rep 2021; 9:e14844. [PMID: 34042301 PMCID: PMC8157772 DOI: 10.14814/phy2.14844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2021] [Revised: 03/25/2021] [Accepted: 04/01/2021] [Indexed: 11/24/2022] Open
Abstract
Early life stress (ELS) is associated with cardiovascular disease (CVD) risk in adulthood, but the underlying vascular mechanisms are poorly understood. Increased hemoglobin and heme have recently been implicated to mediate endothelial dysfunction in several vascular diseases. Chronic physiological stress is associated with alterations in the heme pathway that have been well-described in the literature. However, very little is known about the heme pathway with exposure to ELS or chronic psychosocial stress. Utilizing a mouse model of ELS, maternal separation with early weaning (MSEW), we previously reported that MSEW induces endothelial dysfunction via increased superoxide production. We reasoned that heme dysregulation may be one of the culprits induced by MSEW and sustained throughout adulthood; thus, we hypothesized that MSEW induces heme dysfunction. We investigated whether circulating levels of heme, a circulating pro-oxidant mediator, are increased by MSEW and examined the role of the heme metabolic pathway and heme homeostasis in this process. We found that circulating levels of heme are increased in mice exposed to MSEW and that plasma from MSEW mice stimulated higher superoxide production in cultured mouse aortic endothelial cells (MAECs) compared to plasma from normally reared mice. The heme scavenger hemopexin blunted this enhanced superoxide production. Splenic haptoglobin abundance was significantly lower and hemoglobin levels per red blood cell were significantly higher in MSEW versus control mice. These findings lead us to propose that ELS induces increased circulating heme through dysregulation of the haptoglobin-hemoglobin system representing a mechanistic link between ELS and CVD risk in adulthood.
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Affiliation(s)
- Yasminye D Pettway
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Thomas H Neder
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Dao H Ho
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Brandon M Fox
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Mariah Burch
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Jackson Colson
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Xiaofen Liu
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Cailin E Kellum
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Kelly A Hyndman
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Jennifer S Pollock
- Cardio-Renal Physiology and Medicine, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
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Chiabrando D, Fiorito V, Petrillo S, Bertino F, Tolosano E. HEME: a neglected player in nociception? Neurosci Biobehav Rev 2021; 124:124-136. [PMID: 33545213 DOI: 10.1016/j.neubiorev.2021.01.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Revised: 12/16/2020] [Accepted: 01/08/2021] [Indexed: 12/12/2022]
Abstract
Despite increasing progress in the understanding of the pathophysiology of pain, current management of pain syndromes is still unsatisfactory. The recent discovery of novel pathways associated with pain insensitivity in humans represents a unique opportunity to improve our knowledge on the pathophysiology of pain. Heme metabolism recently emerged as a crucial regulator of nociception. Of note, alteration of heme metabolism has been associated with pain insensitivity as well as with acute and chronic pain in porphyric neuropathy and hemolytic diseases. However, the molecular mechanisms linking heme to the pain pathways still remain unclear. The review focuses on the major heme-regulated processes relevant for sensory neurons' maintenance, peripheral and central sensitization as well as for pain comorbidities, like anxiety and depression. By discussing the body of knowledge on the topic, we provide a novel perspective on the molecular mechanisms linking heme to nociception.
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Affiliation(s)
- Deborah Chiabrando
- Department of Molecular Biotechnology and Health Sciences, Molecular Biotechnology Center, University of Torino, Turin, Italy.
| | - Veronica Fiorito
- Department of Molecular Biotechnology and Health Sciences, Molecular Biotechnology Center, University of Torino, Turin, Italy
| | - Sara Petrillo
- Department of Molecular Biotechnology and Health Sciences, Molecular Biotechnology Center, University of Torino, Turin, Italy
| | - Francesca Bertino
- Department of Molecular Biotechnology and Health Sciences, Molecular Biotechnology Center, University of Torino, Turin, Italy
| | - Emanuela Tolosano
- Department of Molecular Biotechnology and Health Sciences, Molecular Biotechnology Center, University of Torino, Turin, Italy
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Altamura S, Marques O, Colucci S, Mertens C, Alikhanyan K, Muckenthaler MU. Regulation of iron homeostasis: Lessons from mouse models. Mol Aspects Med 2020; 75:100872. [DOI: 10.1016/j.mam.2020.100872] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 06/28/2020] [Accepted: 07/02/2020] [Indexed: 12/13/2022]
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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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Griffiths S, Clark J, Adamides AA, Ziogas J. The role of haptoglobin and hemopexin in the prevention of delayed cerebral ischaemia after aneurysmal subarachnoid haemorrhage: a review of current literature. Neurosurg Rev 2019; 43:1273-1288. [PMID: 31493061 DOI: 10.1007/s10143-019-01169-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 07/23/2019] [Accepted: 08/26/2019] [Indexed: 01/01/2023]
Abstract
Delayed cerebral ischaemia (DCI) after aneurysmal subarachnoid haemorrhage (aSAH) is a major cause of mortality and morbidity. The pathophysiology of DCI after aSAH is thought to involve toxic mediators released from lysis of red blood cells within the subarachnoid space, including free haemoglobin and haem. Haptoglobin and hemopexin are endogenously produced acute phase proteins that are involved in the clearance of these toxic mediators. The aim of this review is to investigate the pathophysiological mechanisms involved in DCI and the role of both endogenous as well as exogenously administered haptoglobin and hemopexin in the prevention of DCI.
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Affiliation(s)
- Sean Griffiths
- Department of Neurosurgery, Royal Melbourne Hospital, 300 Grattan St, Parkville, 3050, Australia. .,Western Hospital, 160 Gordon St, Footscray, 3011, Australia.
| | - Jeremy Clark
- Department of Neurosurgery, Royal Melbourne Hospital, 300 Grattan St, Parkville, 3050, Australia
| | - Alexios A Adamides
- Department of Neurosurgery, Royal Melbourne Hospital, 300 Grattan St, Parkville, 3050, Australia
| | - James Ziogas
- Department of Pharmacology and Therapeutics, University of Melbourne, Parkville, 3010, Australia
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Zhang F, Wei J, Li X, Ma C, Gao Y. Early Candidate Urine Biomarkers for Detecting Alzheimer’s Disease Before Amyloid-β Plaque Deposition in an APP (swe)/PSEN1dE9 Transgenic Mouse Model. J Alzheimers Dis 2018; 66:613-637. [DOI: 10.3233/jad-180412] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Fanshuang Zhang
- Department of Pathophysiology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, School of Basic Medicine Peking Union Medical College, Beijing, China
- Department of Pathology, National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Jing Wei
- Department of Biochemistry and Molecular Biology, Beijing Normal University, Gene Engineering Drug and Biotechnology Beijing Key Laboratory, Beijing, China
| | - Xundou Li
- Department of Pathophysiology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, School of Basic Medicine Peking Union Medical College, Beijing, China
| | - Chao Ma
- Department of Human Anatomy, Histology and Embryology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Neuroscience Center; Joint Laboratory of Anesthesia and Pain, School of Basic Medicine, Peking Union Medical College, Beijing, China
| | - Youhe Gao
- Department of Biochemistry and Molecular Biology, Beijing Normal University, Gene Engineering Drug and Biotechnology Beijing Key Laboratory, Beijing, China
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Mitochondrial Targeting in Neurodegeneration: A Heme Perspective. Pharmaceuticals (Basel) 2018; 11:ph11030087. [PMID: 30231533 PMCID: PMC6161291 DOI: 10.3390/ph11030087] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Revised: 09/07/2018] [Accepted: 09/14/2018] [Indexed: 02/06/2023] Open
Abstract
Mitochondrial dysfunction has achieved an increasing interest in the field of neurodegeneration as a pathological hallmark for different disorders. The impact of mitochondria is related to a variety of mechanisms and several of them can co-exist in the same disease. The central role of mitochondria in neurodegenerative disorders has stimulated studies intended to implement therapeutic protocols based on the targeting of the distinct mitochondrial processes. The review summarizes the most relevant mechanisms by which mitochondria contribute to neurodegeneration, encompassing therapeutic approaches. Moreover, a new perspective is proposed based on the heme impact on neurodegeneration. The heme metabolism plays a central role in mitochondrial functions, and several evidences indicate that alterations of the heme metabolism are associated with neurodegenerative disorders. By reporting the body of knowledge on this topic, the review intends to stimulate future studies on the role of heme metabolism in neurodegeneration, envisioning innovative strategies in the struggle against neurodegenerative diseases.
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Hemopexin is required for adult neurogenesis in the subventricular zone/olfactory bulb pathway. Cell Death Dis 2018; 9:268. [PMID: 29449593 PMCID: PMC5833796 DOI: 10.1038/s41419-018-0328-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Revised: 10/31/2017] [Accepted: 01/09/2018] [Indexed: 12/03/2022]
Abstract
The neural stem cells (NSCs) of the subventricular zone (SVZ) reside within a specialized niche critical for neurogenesis. Hemopexin, a plasma glycoprotein, has been extensively studied as a heme scavenger at the systemic level. However, little is known about its function in the central nervous system, especially in neurogenesis. In the present study, we demonstrate that deletion of hemopexin leads to neurogenic abnormalities in the SVZ/olfactory bulb (OB) pathway. The lateral ventricle is enlarged in hemopexin-deficient mice, and more apoptosis was observed in Dcx+ cells. Lineage differentiation of NSCs was also inhibited in the SVZ of hemopexin-deficient mice, with more stem cells stayed in an undifferentiated, GFAP+ radial glia-like cell stage. Moreover, hemopexin deletion resulted in impaired neuroblast migration in the rostral migratory stream. Furthermore, exogenous hemopexin protein inhibited apoptosis and promoted the migration and differentiation of cultured NSCs. Finally, immunohistochemical analysis demonstrated that deletion of hemopexin reduced the number of interneurons in the OB. Together, these results suggest a new molecular mechanism for the NSC niche that regulates adult neurogenesis in the SVZ/OB pathway. Our findings may benefit the understanding for olfactory system development.
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Knutson MD. Iron transport proteins: Gateways of cellular and systemic iron homeostasis. J Biol Chem 2017; 292:12735-12743. [PMID: 28615441 DOI: 10.1074/jbc.r117.786632] [Citation(s) in RCA: 80] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Cellular iron homeostasis is maintained by iron and heme transport proteins that work in concert with ferrireductases, ferroxidases, and chaperones to direct the movement of iron into, within, and out of cells. Systemic iron homeostasis is regulated by the liver-derived peptide hormone, hepcidin. The interface between cellular and systemic iron homeostasis is readily observed in the highly dynamic iron handling of four main cell types: duodenal enterocytes, erythrocyte precursors, macrophages, and hepatocytes. This review provides an overview of how these cell types handle iron, highlighting how iron and heme transporters mediate the exchange and distribution of body iron in health and disease.
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Affiliation(s)
- Mitchell D Knutson
- Food Science and Human Nutrition Department, University of Florida, Gainesville, Florida 32611-03170.
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Ingoglia G, Sag CM, Rex N, De Franceschi L, Vinchi F, Cimino J, Petrillo S, Wagner S, Kreitmeier K, Silengo L, Altruda F, Maier LS, Hirsch E, Ghigo A, Tolosano E. Data demonstrating the anti-oxidant role of hemopexin in the heart. Data Brief 2017; 13:69-76. [PMID: 28560284 PMCID: PMC5443894 DOI: 10.1016/j.dib.2017.05.026] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Revised: 05/02/2017] [Accepted: 05/09/2017] [Indexed: 11/19/2022] Open
Abstract
The data presented in this article are related to the research article entitled Hemopexin counteracts systolic dysfunction induced by heme-driven oxidative stress (G. Ingoglia, C. M. Sag, N. Rex, L. De Franceschi, F. Vinchi, J. Cimino, S. Petrillo, S. Wagner, K. Kreitmeier, L. Silengo, F. Altruda, L. S. Maier, E. Hirsch, A. Ghigo and E. Tolosano, 2017) [1]. Data show that heme induces reactive oxygen species (ROS) production in primary cardiomyocytes. H9c2 myoblastic cells treated with heme bound to human Hemopexin (Hx) are protected from heme accumulation and oxidative stress. Similarly, the heme-driven oxidative response is reduced in primary cardiomyocytes treated with Hx-heme compared to heme alone. Our in vivo data show that mouse models of hemolytic disorders, β-thalassemic mice and phenylhydrazine-treated mice, have low serum Hx associated to enhanced expression of heme- and oxidative stress responsive genes in the heart. Hx-/- mice do not show signs of heart fibrosis or overt inflammation. For interpretation and discussion of these data, refer to the research article referenced above.
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Affiliation(s)
- Giada Ingoglia
- Dept. Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Can Martin Sag
- Dept. Internal Medicine II, University Hospital Regensburg, Regensburg, Germany
| | - Nikolai Rex
- Dept. Internal Medicine II, University Hospital Regensburg, Regensburg, Germany
| | - Lucia De Franceschi
- Dept. Medicine, Università degli Studi di Verona–Azienda Ospedaliera Universitaria Integrata Verona, Verona, Italy
| | - Francesca Vinchi
- Heidelberg University Hospital / EMBL Heidelberg, Heidelberg, Germany
| | - James Cimino
- Dept. Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Sara Petrillo
- Dept. Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Stefan Wagner
- Dept. Internal Medicine II, University Hospital Regensburg, Regensburg, Germany
| | - Klaus Kreitmeier
- Dept. Internal Medicine II, University Hospital Regensburg, Regensburg, Germany
| | - Lorenzo Silengo
- Dept. Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Fiorella Altruda
- Dept. Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Lars S. Maier
- Dept. Internal Medicine II, University Hospital Regensburg, Regensburg, Germany
| | - Emilio Hirsch
- Dept. Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Alessandra Ghigo
- Dept. Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Emanuela Tolosano
- Dept. Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
- Corresponding author.
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Laftah AH, Simpson RJ, Latunde-Dada GO. Intestinal heme absorption in hemochromatosis gene knock-out mice. World J Hematol 2017; 6:17-23. [DOI: 10.5315/wjh.v6.i1.17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Revised: 11/08/2016] [Accepted: 12/19/2016] [Indexed: 02/05/2023] Open
Abstract
AIM To investigat the influence of hemochromatosis gene (Hfe) mutation on 59Fe labelled duodenal heme absorption in mice.
METHODS Heme absorption was measured in Hfe wild type and Hfe(-/-) mice by the duodenal tied loop and by oral gavage methods. The mRNA expression of heme oxygenase (HO-1), Abcg2 and Flvcr1 genes and levels were determined by quantitative polymerase chain reaction.
RESULTS Heme absorption was significantly increased in homozygous Hfe(-/-) mice despite significant hepatic and splenic iron overload. While duodenal HO-1 mRNA was highly expressed in the wild type and Hfe(-/-) heme-treated group following 24 h heme administration, Flvcr1a mRNA decreased. However, Abcg2 mRNA expression levels in duodenum remained unchanged.
CONCLUSION Heme absorption was enhanced in Hfe(-/-) mice from both duodenal tied-loop segments and by oral gavage methods. HO-1 mRNA levels were enhanced in mice duodenum after 24 h of heme feeding and may account for enhanced heme absorption in Hfe(-/-) mice. Implications for dietary recommendations on heme intake by Hfe subjects to modulate iron loading are important clinical considerations.
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Blissett AR, Ollander B, Penn B, McTigue DM, Agarwal G. Magnetic mapping of iron in rodent spleen. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2016; 13:977-986. [PMID: 27890658 DOI: 10.1016/j.nano.2016.11.011] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Revised: 10/25/2016] [Accepted: 11/17/2016] [Indexed: 01/12/2023]
Abstract
Evaluation of iron distribution and density in biological tissues is important to understand the pathogenesis of a variety of diseases and the fate of exogenously administered iron-based carriers and contrast agents. Iron distribution in tissues is typically characterized via histochemical (Perl's) stains or immunohistochemistry for ferritin, the major iron storage protein. A more accurate mapping of iron can be achieved via ultrastructural transmission electron microscopy (TEM) based techniques, which involve stringent sample preparation conditions. In this study, we elucidate the capability of magnetic force microscopy (MFM) as a label-free technique to map iron at the nanoscale level in rodent spleen tissue. We complemented and compared our MFM results with those obtained using Perl's staining and TEM. Our results show how MFM mapping corresponded to sizes of iron-rich lysosomes at a resolution comparable to that of TEM. In addition MFM is compatible with tissue sections commonly prepared for routine histology.
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Affiliation(s)
- Angela R Blissett
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH
| | - Brooke Ollander
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH
| | - Brittany Penn
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH
| | - Dana M McTigue
- The Center for Brain and Spinal Cord Repair and the Department of Neuroscience, The Ohio State University, Columbus, OH
| | - Gunjan Agarwal
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH.
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Deletion of the hemopexin or heme oxygenase-2 gene aggravates brain injury following stroma-free hemoglobin-induced intracerebral hemorrhage. J Neuroinflammation 2016; 13:26. [PMID: 26831741 PMCID: PMC4736638 DOI: 10.1186/s12974-016-0490-1] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Accepted: 01/23/2016] [Indexed: 01/10/2023] Open
Abstract
Background Following intracerebral hemorrhage (ICH), red blood cells release massive amounts of toxic heme that causes local brain injury. Hemopexin (Hpx) has the highest binding affinity to heme and participates in its transport, while heme oxygenase 2 (HO2) is the rate-limiting enzyme for the degradation of heme. Microglia are the resident macrophages in the brain; however, the significance and role of HO2 and Hpx on microglial clearance of the toxic heme (iron-protoporphyrin IX) after ICH still remain understudied. Accordingly, we postulated that global deletion of constitutive HO2 or Hpx would lead to worsening of ICH outcomes. Methods Intracerebral injection of stroma-free hemoglobin (SFHb) was used in our study to induce ICH. Hpx knockout (Hpx−/−) or HO2 knockout (HO2−/−) mice were injected with 10 μL of SFHb in the striatum. After injection, behavioral/functional tests were performed, along with anatomical analyses. Iron deposition and neuronal degeneration were depicted by Perls’ and Fluoro-Jade B staining, respectively. Immunohistochemistry with anti-ionized calcium-binding adapter protein 1 (Iba1) was used to estimate activated microglial cells around the injured site. Results This study shows that deleting Hpx or HO2 aggravated SFHb-induced brain injury. Compared to wild-type littermates, larger lesion volumes were observed in Hpx−/− and HO2−/− mice, which also bear more degenerating neurons in the peri-lesion area 24 h postinjection. Fewer Iba1-positive microglial cells were detected at the peri-lesion area in Hpx−/− and HO2−/− mice, interestingly, which is associated with markedly increased iron-positive microglial cells. Moreover, the Iba1-positive microglial cells increased from 24 to 72 h postinjection and were accompanied with improved neurologic deficits in Hpx−/− and HO2−/− mice. These results suggest that Iba1-positive microglial cells could engulf the extracellular SFHb and provide protective effects after ICH. We then treated cultured primary microglial cells with SFHb at low and high concentrations. The results show that microglial cells actively take up the extracellular SFHb. Of interest, we also found that iron overload in microglia significantly reduces the Iba1 expression level and resultantly inhibits microglial phagocytosis. Conclusions This study suggests that microglial cells contribute to hemoglobin-heme clearance after ICH; however, the resultant iron overloads in microglia appear to decrease Iba1 expression and to further inhibit microglial phagocytosis.
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Fiorito V, Forni M, Silengo L, Altruda F, Tolosano E. Crucial Role of FLVCR1a in the Maintenance of Intestinal Heme Homeostasis. Antioxid Redox Signal 2015; 23:1410-23. [PMID: 26067085 DOI: 10.1089/ars.2014.6216] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
AIMS The maintenance of heme homeostasis, mucosa cell renewal, and redox environment in the intestine is essential to permit digestion, absorption, cell proliferation, cell apoptosis, and immune response and to avoid the development of gut disorders. The feline leukemia virus, subgroup C, receptor 1a (FLVCR1a) is a heme exporter expressed in almost all cell types, including intestinal cells. This work investigates the role of FLVCR1a in the intestine, taking advantage of an intestine-specific conditional Flvcr1a-knockout mouse and of FLVCR1a-depleted Caco2 cells. RESULTS The data show that FLVCR1a does not participate in the absorption of dietary heme, whereas it is involved in the export of de novo synthesized heme from intestinal cells. The loss of Flvcr1a is associated with a decrease of intestinal cell proliferation and with alterations in the peculiar homeostasis of proliferating cells, including the maintenance of their redox status. The involvement of FLVCR1a in these processes renders this exporter crucial for the survival of mice in a model of ulcerative colitis. INNOVATION These findings shed light on the role of heme export in the dietary heme absorption process and unravel a new role for heme export in the control of mucosal renewal and in proliferating cell redox status and metabolic activity, demonstrating a crucial role for FLVCR1a in maintaining intestinal homeostasis in both physiologic and pathologic situations. CONCLUSION By exporting the excess of de novo synthesized heme from intestinal cells, FLVCR1a participates in the control of intestinal mucosa homeostasis.
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Affiliation(s)
- Veronica Fiorito
- 1 Department of Molecular Biotechnology and Health Sciences, Molecular Biotechnology Center, University of Torino , Torino, Italy
| | - Marco Forni
- 2 EuroClone S.p.A Research Laboratory, Molecular Biotechnology Centre (MBC), University of Torino , Torino, Italy
| | - Lorenzo Silengo
- 1 Department of Molecular Biotechnology and Health Sciences, Molecular Biotechnology Center, University of Torino , Torino, Italy
| | - Fiorella Altruda
- 1 Department of Molecular Biotechnology and Health Sciences, Molecular Biotechnology Center, University of Torino , Torino, Italy
| | - Emanuela Tolosano
- 1 Department of Molecular Biotechnology and Health Sciences, Molecular Biotechnology Center, University of Torino , Torino, Italy
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Bisaro B, Mandili G, Poli A, Piolatto A, Papa V, Novelli F, Cenacchi G, Forni M, Zanini C. Proteomic analysis of extracellular vesicles from medullospheres reveals a role for iron in the cancer progression of medulloblastoma. MOLECULAR AND CELLULAR THERAPIES 2015; 3:8. [PMID: 26464805 PMCID: PMC4603768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Figures] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Accepted: 10/06/2015] [Indexed: 11/21/2023]
Abstract
BACKGROUND Medulloblastoma (MB) is the most common malignant childhood brain tumor with the propensity to disseminate at an early stage, and is associated with high morbidity. New treatment strategies are needed to improve cure rates and to reduce life-long cognitive and functional deficits associated with current therapies. Extracellular Vesicles (EVs) are important players in cell-to-cell communication in health and diseases. A clearer understanding of cell-to-cell communication in tumors can be achieved by studying EV secretion in medullospheres. This can reveal subtle modifications induced by the passage from adherent to non-adherent growth, as spheres may account for the adaptation of tumor cells to the mutated environment. METHODS Formation of medullospheres from MB cell lines stabilized in adherent conditions was obtained through culture conditioning based on low attachment flasks and specialized medium. EVs collected by ultracentrifugation, in adherent conditions and as spheres, were subjected to electron microscopy, NanoSight measurements and proteomics. RESULTS Interestingly, iron carrier proteins were only found in EVs shed by CSC-enriched tumor cell population of spheres. We used iron chelators when culturing MB cell lines as spheres. Iron chelators induced a decrease in number/size of spheres and in stem cell populations able to initiate in vitro spheres formation. CONCLUSIONS This work suggests a not yet identified role of iron metabolism in MB progression and invasion and opens the possibility to use chelators as adjuvants in anti-tumoral chemotherapy.
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Affiliation(s)
- Brigitte Bisaro
- />EuroClone S.p.A Research Laboratory, Molecular Biotechnology Centre (MBC), University of Turin, Turin, Italy
| | - Giorgia Mandili
- />Centre for Experimental and Clinical Studies CERMS, Azienda Universitaria Ospedaliera Città della Salute e della Scienza Città di Torino, Turin, Italy
| | - Alice Poli
- />BioDigitalValley srl, Pont-Saint-Martin (AO), Turin, Italy
| | - Andrea Piolatto
- />Department of Molecular Biotechnology and Heath Sciences, University of Turin, Turin, Italy
| | - Valentina Papa
- />Department of Neuromotor and Biomedical Sciences, Alma Mater University of Bologna, Bologna, Italy
| | - Francesco Novelli
- />Department of Molecular Biotechnology and Heath Sciences, University of Turin, Turin, Italy
| | - Giovanna Cenacchi
- />Department of Neuromotor and Biomedical Sciences, Alma Mater University of Bologna, Bologna, Italy
| | - Marco Forni
- />Department of Molecular Biotechnology and Heath Sciences, University of Turin, Turin, Italy
| | - Cristina Zanini
- />EuroClone S.p.A Research Laboratory, Molecular Biotechnology Centre (MBC), University of Turin, Turin, Italy
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Bisaro B, Mandili G, Poli A, Piolatto A, Papa V, Novelli F, Cenacchi G, Forni M, Zanini C. Proteomic analysis of extracellular vesicles from medullospheres reveals a role for iron in the cancer progression of medulloblastoma. MOLECULAR AND CELLULAR THERAPIES 2015; 3:8. [PMID: 26464805 PMCID: PMC4603768 DOI: 10.1186/s40591-015-0045-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Accepted: 10/06/2015] [Indexed: 12/21/2022]
Abstract
BACKGROUND Medulloblastoma (MB) is the most common malignant childhood brain tumor with the propensity to disseminate at an early stage, and is associated with high morbidity. New treatment strategies are needed to improve cure rates and to reduce life-long cognitive and functional deficits associated with current therapies. Extracellular Vesicles (EVs) are important players in cell-to-cell communication in health and diseases. A clearer understanding of cell-to-cell communication in tumors can be achieved by studying EV secretion in medullospheres. This can reveal subtle modifications induced by the passage from adherent to non-adherent growth, as spheres may account for the adaptation of tumor cells to the mutated environment. METHODS Formation of medullospheres from MB cell lines stabilized in adherent conditions was obtained through culture conditioning based on low attachment flasks and specialized medium. EVs collected by ultracentrifugation, in adherent conditions and as spheres, were subjected to electron microscopy, NanoSight measurements and proteomics. RESULTS Interestingly, iron carrier proteins were only found in EVs shed by CSC-enriched tumor cell population of spheres. We used iron chelators when culturing MB cell lines as spheres. Iron chelators induced a decrease in number/size of spheres and in stem cell populations able to initiate in vitro spheres formation. CONCLUSIONS This work suggests a not yet identified role of iron metabolism in MB progression and invasion and opens the possibility to use chelators as adjuvants in anti-tumoral chemotherapy.
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Affiliation(s)
- Brigitte Bisaro
- EuroClone S.p.A Research Laboratory, Molecular Biotechnology Centre (MBC), University of Turin, Turin, Italy
| | - Giorgia Mandili
- Centre for Experimental and Clinical Studies CERMS, Azienda Universitaria Ospedaliera Città della Salute e della Scienza Città di Torino, Turin, Italy
| | - Alice Poli
- BioDigitalValley srl, Pont-Saint-Martin (AO), Turin, Italy
| | - Andrea Piolatto
- Department of Molecular Biotechnology and Heath Sciences, University of Turin, Turin, Italy
| | - Valentina Papa
- Department of Neuromotor and Biomedical Sciences, Alma Mater University of Bologna, Bologna, Italy
| | - Francesco Novelli
- Department of Molecular Biotechnology and Heath Sciences, University of Turin, Turin, Italy
| | - Giovanna Cenacchi
- Department of Neuromotor and Biomedical Sciences, Alma Mater University of Bologna, Bologna, Italy
| | - Marco Forni
- Department of Molecular Biotechnology and Heath Sciences, University of Turin, Turin, Italy
| | - Cristina Zanini
- EuroClone S.p.A Research Laboratory, Molecular Biotechnology Centre (MBC), University of Turin, Turin, Italy
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Bamm VV, Harauz G. Hemoglobin as a source of iron overload in multiple sclerosis: does multiple sclerosis share risk factors with vascular disorders? Cell Mol Life Sci 2014; 71:1789-98. [PMID: 24504127 PMCID: PMC11113400 DOI: 10.1007/s00018-014-1570-y] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Revised: 01/16/2014] [Accepted: 01/20/2014] [Indexed: 12/12/2022]
Abstract
Although iron is known to be essential for the normal development and health of the central nervous system, abnormal iron deposits are found in and around multiple sclerosis (MS) lesions that themselves are closely associated with the cerebral vasculature. However, the origin of this excess iron is unknown, and it is not clear whether this is one of the primary causative events in the pathogenesis of MS, or simply another consequence of the long-lasting inflammatory conditions. Here, applying a systems biology approach, we propose an additional way for understanding the neurodegenerative component of the disease caused by chronic subclinical extravasation of hemoglobin, in combination with multiple other factors including, but not limited to, dysfunction of different cellular protective mechanisms against extracellular hemoglobin reactivity and oxidative stress. Moreover, such considerations could also shed light on and explain the higher susceptibility of MS patients to a wide range of cardiovascular disorders.
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Affiliation(s)
- Vladimir V. Bamm
- Department of Molecular and Cellular Biology, University of Guelph, 50 Stone Road East, Guelph, ON N1G 2W1 Canada
| | - George Harauz
- Department of Molecular and Cellular Biology, University of Guelph, 50 Stone Road East, Guelph, ON N1G 2W1 Canada
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Chiabrando D, Vinchi F, Fiorito V, Mercurio S, Tolosano E. Heme in pathophysiology: a matter of scavenging, metabolism and trafficking across cell membranes. Front Pharmacol 2014; 5:61. [PMID: 24782769 PMCID: PMC3986552 DOI: 10.3389/fphar.2014.00061] [Citation(s) in RCA: 268] [Impact Index Per Article: 26.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2014] [Accepted: 03/18/2014] [Indexed: 01/19/2023] Open
Abstract
Heme (iron-protoporphyrin IX) is an essential co-factor involved in multiple biological processes: oxygen transport and storage, electron transfer, drug and steroid metabolism, signal transduction, and micro RNA processing. However, excess free-heme is highly toxic due to its ability to promote oxidative stress and lipid peroxidation, thus leading to membrane injury and, ultimately, apoptosis. Thus, heme metabolism needs to be finely regulated. Intracellular heme amount is controlled at multiple levels: synthesis, utilization by hemoproteins, degradation and both intracellular and intercellular trafficking. This review focuses on recent findings highlighting the importance of controlling intracellular heme levels to counteract heme-induced oxidative stress. The contributions of heme scavenging from the extracellular environment, heme synthesis and incorporation into hemoproteins, heme catabolism and heme transport in maintaining adequate intracellular heme content are discussed. Particular attention is put on the recently described mechanisms of heme trafficking through the plasma membrane mediated by specific heme importers and exporters. Finally, the involvement of genes orchestrating heme metabolism in several pathological conditions is illustrated and new therapeutic approaches aimed at controlling heme metabolism are discussed.
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Affiliation(s)
- Deborah Chiabrando
- Department of Molecular Biotechnology and Health Sciences, Molecular Biotechnology Center, University of Turin Turin, Italy
| | - Francesca Vinchi
- Department of Molecular Biotechnology and Health Sciences, Molecular Biotechnology Center, University of Turin Turin, Italy
| | - Veronica Fiorito
- Department of Molecular Biotechnology and Health Sciences, Molecular Biotechnology Center, University of Turin Turin, Italy
| | - Sonia Mercurio
- Department of Molecular Biotechnology and Health Sciences, Molecular Biotechnology Center, University of Turin Turin, Italy
| | - Emanuela Tolosano
- Department of Molecular Biotechnology and Health Sciences, Molecular Biotechnology Center, University of Turin Turin, Italy
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Rolla S, Ingoglia G, Bardina V, Silengo L, Altruda F, Novelli F, Tolosano E. Acute-phase protein hemopexin is a negative regulator of Th17 response and experimental autoimmune encephalomyelitis development. THE JOURNAL OF IMMUNOLOGY 2013; 191:5451-9. [PMID: 24154625 DOI: 10.4049/jimmunol.1203076] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Hemopexin (Hx) is an acute-phase protein synthesized by hepatocytes in response to the proinflammatory cytokines IL-6, IL-1β, and TNF-α. Hx is the plasma protein with the highest binding affinity to heme and controls heme-iron availability in tissues and also in T lymphocytes, where it modulates their responsiveness to IFN-γ. Recent data have questioned regarding an anti-inflammatory role of Hx, a role that may be both heme-binding dependent and independent. The aim of this study was to investigate the role of Hx in the development of a T cell-mediated inflammatory autoimmune response. During experimental autoimmune encephalomyelitis (EAE), the mouse model of multiple sclerosis, Hx content in serum increased and remained high. When EAE was induced in Hx knockout (Hx(-/-)) mice, they developed a clinically earlier and exacerbated EAE compared with wild-type mice, associated to a higher amount of CD4(+)-infiltrating T cells. The severe EAE developed by Hx(-/-) mice could be ascribed to an enhanced expansion of Th17 cells accounting for both a higher disposition of naive T cells to differentiate toward the Th17 lineage and a higher production of Th17 differentiating cytokines IL-6 and IL-23 by APCs. When purified human Hx was injected in Hx(-/-) mice before EAE induction, Th17 expansion, as well as disease severity, were comparable with those of wild-type mice. Taken together, these data indicate that Hx has a negative regulatory role in Th17-mediated inflammation and prospect its pharmacological use to limit the expansion of this cell subset in inflammatory and autoimmune disease.
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Affiliation(s)
- Simona Rolla
- Department of Molecular Biotechnology and Health Sciences, University of Turin, 10126 Turin, Italy
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Lack of Plasma Protein Hemopexin Results in Increased Duodenal Iron Uptake. PLoS One 2013; 8:e68146. [PMID: 23826373 PMCID: PMC3694894 DOI: 10.1371/journal.pone.0068146] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2012] [Accepted: 05/26/2013] [Indexed: 12/21/2022] Open
Abstract
Purpose The body concentration of iron is regulated by a fine equilibrium between absorption and losses of iron. Iron can be absorbed from diet as inorganic iron or as heme. Hemopexin is an acute phase protein that limits iron access to microorganisms. Moreover, it is the plasma protein with the highest binding affinity for heme and thus it mediates heme-iron recycling. Considering its involvement in iron homeostasis, it was postulated that hemopexin may play a role in the physiological absorption of inorganic iron. Methods and Results Hemopexin-null mice showed elevated iron deposits in enterocytes, associated with higher duodenal H-Ferritin levels and a significant increase in duodenal expression and activity of heme oxygenase. The expression of heme-iron and inorganic iron transporters was normal. The rate of iron absorption was assessed by measuring the amount of 57Fe retained in tissues from hemopexin-null and wild-type animals after administration of an oral dose of 57FeSO4 or of 57Fe-labelled heme. Higher iron retention in the duodenum of hemopexin-null mice was observed as compared with normal mice. Conversely, iron transfer from enterocytes to liver and bone marrow was unaffected in hemopexin-null mice. Conclusions The increased iron level in hemopexin-null duodenum can be accounted for by an increased iron uptake by enterocytes and storage in ferritins. These data indicate that the lack of hemopexin under physiological conditions leads to an enhanced duodenal iron uptake thus providing new insights to our understanding of body iron homeostasis.
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Therapeutic approaches to limit hemolysis-driven endothelial dysfunction: scavenging free heme to preserve vasculature homeostasis. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2013; 2013:396527. [PMID: 23781294 PMCID: PMC3678425 DOI: 10.1155/2013/396527] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2013] [Revised: 04/29/2013] [Accepted: 05/14/2013] [Indexed: 12/11/2022]
Abstract
Hemolysis results in the release of hemoglobin and heme into the bloodstream and is associated with the development of several pathologic conditions of different etiology, including hemoglobinopathies, hemolytic anemias, bacterial infections, malaria, and trauma. In addition, hemolysis is associated with surgical procedures, hemodialysis, blood transfusion, and other conditions in which mechanical forces can lead to red blood cell rupture. Free plasma hemoglobin and heme are toxic for the vascular endothelium since heme iron promotes oxidative stress that causes endothelial activation responsible for vasoocclusive events and thrombus formation. Moreover, free hemoglobin scavenges nitric oxide, reducing its bioavailability, and heme favours ROS production, thus causing oxidative nitric oxide consumption. This results in the dysregulation of the endothelium vasodilator:vasoconstrictor balance, leading to severe vasoconstriction and hypertension. Thus, endothelial dysfunction and impairment of cardiovascular function represent a common feature of pathologic conditions associated with hemolysis. In this review, we discuss how hemoglobin/heme released following hemolysis may affect vascular function and summarise the therapeutic approaches available to limit hemolysis-driven endothelial dysfunction. Particular emphasis is put on recent data showing the beneficial effects obtained through the use of the plasma heme scavenger hemopexin in counteracting heme-mediated endothelial damage in mouse models of hemolytic diseases.
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Abstract
Murine models have made valuable contributions to our understanding of iron metabolism. Investigation of mice with inherited forms of anemia has led to the discovery of novel proteins involved in iron homeostasis. A growing number of murine models are being developed to investigate mitochondrial iron metabolism. Mouse strains are available for the major forms of hereditary hemochromatosis. Findings in murine models support the concept that the pathogenesis of nearly all forms of hereditary hemochromatosis involves inappropriately low expression of hepcidin. The availability of mice with floxed iron-related genes allows the study of the in vivo consequences of cell-selective deletion of these genes.
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Affiliation(s)
- Robert E Fleming
- Departments of Pediatrics and Biochemistry & Molecular Biology, Saint Louis University School of Medicine, St. Louis, MO 63104, USA.
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Morello N, Bianchi FT, Marmiroli P, Tonoli E, Rodriguez Menendez V, Silengo L, Cavaletti G, Vercelli A, Altruda F, Tolosano E. A role for hemopexin in oligodendrocyte differentiation and myelin formation. PLoS One 2011; 6:e20173. [PMID: 21633699 PMCID: PMC3102107 DOI: 10.1371/journal.pone.0020173] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2011] [Accepted: 04/15/2011] [Indexed: 12/27/2022] Open
Abstract
Myelin formation and maintenance are crucial for the proper function of the CNS and are orchestrated by a plethora of factors including growth factors, extracellular matrix components, metalloproteases and protease inhibitors. Hemopexin (Hx) is a plasma protein with high heme binding affinity, which is also locally produced in the CNS by ependymal cells, neurons and glial cells. We have recently reported that oligodendrocytes (OLs) are the type of cells in the brain that are most susceptible to lack of Hx, as the number of iron-overloaded OLs increases in Hx-null brain, leading to oxidative tissue damage. In the current study, we found that the expression of the Myelin Basic Protein along with the density of myelinated fibers in the basal ganglia and in the motor and somatosensory cortex of Hx-null mice were strongly reduced starting at 2 months and progressively decreased with age. Myelin abnormalities were confirmed by electron microscopy and, at the functional level, resulted in the inability of Hx-null mice to perform efficiently on the Rotarod. It is likely that the poor myelination in the brain of Hx-null mice was a consequence of defective maturation of OLs as we demonstrated that the number of mature OLs was significantly reduced in mutant mice whereas that of precursor cells was normal. Finally, in vitro experiments showed that Hx promotes OL differentiation. Thus, Hx may be considered a novel OL differentiation factor and the modulation of its expression in CNS may be an important factor in the pathogenesis of human neurodegenerative disorders.
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Affiliation(s)
- Noemi Morello
- Molecular Biotechnology Center, University of
Turin, Turin, Italy
| | | | - Paola Marmiroli
- Department of Neuroscience and Biomedical
Technologies, University of Milan Bicocca, Monza, Italy
| | - Elisabetta Tonoli
- Neuroscience Institute of Turin, Department of
Anatomy, Pharmacology and Forensic Medicine, University of Turin, Turin,
Italy
| | | | - Lorenzo Silengo
- Molecular Biotechnology Center, University of
Turin, Turin, Italy
| | - Guido Cavaletti
- Department of Neuroscience and Biomedical
Technologies, University of Milan Bicocca, Monza, Italy
| | - Alessandro Vercelli
- Neuroscience Institute of Turin, Department of
Anatomy, Pharmacology and Forensic Medicine, University of Turin, Turin,
Italy
| | - Fiorella Altruda
- Molecular Biotechnology Center, University of
Turin, Turin, Italy
| | - Emanuela Tolosano
- Molecular Biotechnology Center, University of
Turin, Turin, Italy
- * E-mail:
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Castiglioni E, Finazzi D, Goldwurm S, Pezzoli G, Forni G, Girelli D, Maccarinelli F, Poli M, Ferrari M, Cremonesi L, Arosio P. Analysis of nucleotide variations in genes of iron management in patients of Parkinson's disease and other movement disorders. PARKINSONS DISEASE 2010; 2011:827693. [PMID: 20981230 PMCID: PMC2957853 DOI: 10.4061/2011/827693] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 06/17/2010] [Accepted: 09/27/2010] [Indexed: 12/30/2022]
Abstract
The capacity to act as an electron donor and acceptor makes iron an essential cofactor of many vital processes. Its balance in the body has to be tightly regulated since its excess can be harmful by favouring oxidative damage, while its deficiency can impair fundamental activities like erythropoiesis. In the brain, an accumulation of iron or an increase in its availability has been associated with the development and/or progression of different degenerative processes, including Parkinson's disease, while iron paucity seems to be associated with cognitive deficits, motor dysfunction, and restless legs syndrome. In the search of DNA sequence variations affecting the individual predisposition to develop movement disorders, we scanned by DHPLC the exons and intronic boundary regions of ceruloplasmin, iron regulatory protein 2, hemopexin, hepcidin and hemojuvelin genes in cohorts of subjects affected by Parkinson's disease and idiopathic neurodegeneration with brain iron accumulation (NBIA). Both novel and known sequence variations were identified in most of the genes, but none of them seemed to be significantly associated to the movement diseases of interest.
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Affiliation(s)
- Emanuela Castiglioni
- Genomic Unit for the Diagnosis of Human Pathologies, Center for Genomics, Bioinformatics and Biostatistics, San Raffaele Scientific Institute, 20132 Milan, Italy
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Robotti A, Natale M, Albo AG, Lis K, Perga S, Marnetto F, Gilli F, Bertolotto A. Acute-phase proteins investigation based on lectins affinity capture prior to 2-DE separation: Application to serum from multiple sclerosis patients. Electrophoresis 2010; 31:2882-93. [DOI: 10.1002/elps.201000171] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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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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Brettschneider J, Hartmann N, Lehmensiek V, Mogel H, Ludolph AC, Tumani H. Cerebrospinal fluid markers of idiopathic intracranial hypertension: is the renin-angiotensinogen system involved? Cephalalgia 2010; 31:116-21. [PMID: 20974581 DOI: 10.1177/0333102410375726] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND The causes underlying idiopathic intracranial hypertension (IIH) are poorly understood. METHODS To identify disease-related biomarkers that could offer a new insight into IIH pathology, we analyzed the cerebrospinal fluid (CSF) of 18 patients with IIH and 18 controls using two-dimensional fluorescence differential in-gel electrophoresis (2-D DIGE). RESULTS We found six proteins that were upregulated in IIH (sterol regulatory element-binding protein 1, zinc-alpha-2-glycoprotein, immunoglobulin heavy constant alpha 1 [IGHA1], alpha-1-antitrypsin [SERPINA1], serotransferrin, haptoglobin) and four proteins that were downregulated (hemopexin, angiotensinogen, vitamin-D-binding protein, transthyretin). The validity of our approach was confirmed for one candidate protein (angiotensinogen). To account for a dependency from blood-CSF barrier function, the ratio of angiotensinogen and albumin CSF-to-serum quotients (Qang/Qalb) was determined, which confirmed the downregulation of angiotensinogen in IIH (p = .04). CONCLUSION Previous studies showed the intrinsic renin-angiotensin system (RAS) to regulate choroid plexus blood flow and CSF production. Altered levels of angiotensinogen could indicate an imbalance of the RAS in IIH that may provide new targets for therapeutic intervention.
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Roher AE, Maarouf CL, Sue LI, Hu Y, Wilson J, Beach TG. Proteomics-derived cerebrospinal fluid markers of autopsy-confirmed Alzheimer's disease. Biomarkers 2010; 14:493-501. [PMID: 19863188 DOI: 10.3109/13547500903108423] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The diagnostic performance of several candidate cerebrospinal fluid (CSF) protein biomarkers in neuropathologically confirmed Alzheimer's disease (AD), non-demented (ND) elderly controls and non-AD dementias (NADD) was assessed. Candidate markers were selected on the basis of initial two-dimensional gel electrophoresis studies or by literature review. Markers selected by the former method included apolipoprotein A-1 (ApoA1), haemopexin (HPX), transthyretin (TTR) and pigment epithelium-derived factor (PEDF), while markers identified from the literature included Abeta1-40, Abeta1-42, total tau, phosphorylated tau, alpha-1 acid glycoprotein (A1GP), haptoglobin, zinc alpha-2 glycoprotein (Z2GP) and apolipoprotein E (ApoE). Ventricular CSF concentrations of the markers were measured by enzyme-linked immunosorbent assay (ELISA). The concentrations of Abeta1-42, ApoA1, A1GP, ApoE, HPX and Z2GP differed significantly among AD, ND and NADD subjects. Logistic regression analysis for the diagnostic discrimination of AD from ND found that Abeta1-42, ApoA1 and HPX each had significant and independent associations with diagnosis. The CSF concentrations of these three markers distinguished AD from ND subjects with 84% sensitivity and 72% specificity, with 78% of subjects correctly classified. By comparison, using Abeta1-42 alone gave 79% sensitivity and 61% specificity, with 68% of subjects correctly classified. For the diagnostic discrimination of AD from NADD, only the concentration of Abeta1-42 was significantly related to diagnosis, with a sensitivity of 58%, specificity of 86% and 86% correctly classified. The results indicate that for the discrimination of AD from ND control subjects, measurement of a set of markers including Abeta1-42, ApoA1 and HPX improved diagnostic performance over that obtained by measurement of Abeta1-42 alone. For the discrimination of AD from NADD subjects, measurement of Abeta1-42 alone was superior.
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Affiliation(s)
- Alex E Roher
- The Longtine Center for Molecular Biology and Genetics, Sun Health Research Institute, 10515 West Santa Fe Drive, Sun City, AZ 85351, 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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