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Levy C, Dickey AK, Wang B, Thapar M, Naik H, Keel SB, Saberi B, Beaven SW, Rudnick SR, Elmariah SB, Erwin AL, Goddu RJ, Hedstrom K, Leaf RK, Kazamel M, Mazepa M, Philpotts LL, Quigley J, Raef H, Ungar J, Anderson KE, Balwani M. Evidence-based consensus guidelines for the diagnosis and management of protoporphyria-related liver dysfunction in erythropoietic protoporphyria and X-linked protoporphyria. Hepatology 2024; 79:731-743. [PMID: 37505211 PMCID: PMC10818013 DOI: 10.1097/hep.0000000000000546] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 06/13/2023] [Indexed: 07/29/2023]
Affiliation(s)
- Cynthia Levy
- Division of Digestive Health and Liver Diseases, University of Miami Miller School of Medicine, Miami, FL
| | - Amy K. Dickey
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Massachusetts General Hospital, Boston, MA
- Harvard Medical School, Boston, MA
| | - Bruce Wang
- Department of Medicine, University of California San Francisco Medical Center, San Francisco, CA
| | - Manish Thapar
- Division of Gastroenterology, Thomas Jefferson University Hospital, Philadelphia, PA
| | - Hetanshi Naik
- Department of Genetics, Stanford University School of Medicine, Palo Alto, CA
| | - Siobán B. Keel
- Division of Hematology, University of Washington School of Medicine, Seattle, WA
| | - Behnam Saberi
- Division of Gastroenterology, Beth Israel Deaconess Medical Center, Boston, MA
| | - Simon W. Beaven
- Vatche & Tamar Manoukian Division of Digestive Diseases, David Geffen School of Medicine, University of California Los Angeles Medical Center, Los Angeles, CA
| | - Sean R. Rudnick
- Department of Internal Medicine, Section on Gastroenterology and Hepatology, Atrium Health Wake Forest Baptist, Winston-Salem, NC
| | - Sarina B. Elmariah
- Department of Dermatology, University of California San Francisco, San Francisco, CA
| | - Angelika L. Erwin
- Center for Personalized Genetic Healthcare, Cleveland Clinic, Cleveland, OH
| | - Robert J. Goddu
- Division of Continuing Education, University of Colorado Boulder, Boulder, CO
| | - Karli Hedstrom
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY
| | - Rebecca Karp Leaf
- Harvard Medical School, Boston, MA
- Division of Hematology and Oncology, Department of Medicine, Massachusetts General Hospital, Boston, MA
| | - Mohamed Kazamel
- Department of Neurology, University of Alabama at Birmingham, Birmingham, AL
| | - Marshall Mazepa
- Division of Hematology,Oncology, and Transplantation, Department of Medicine, University of Minnesota, Minneapolis, MN
| | | | - John Quigley
- Division of Hematology/Oncology, Department of Medicine, University of Illinois Chicago, IL
| | - Haya Raef
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Massachusetts General Hospital, Boston, MA
- Division of Hematology, University of Washington School of Medicine, Seattle, WA
- Department of Dermatology, University of California San Francisco, San Francisco, CA
| | - Jonathan Ungar
- Department of Dermatology, Mount Sinai Hospital, New York, NY
| | - Karl E. Anderson
- Department of Internal Medicine (Division of Gastroenterology & Hepatology), University of Texas Medical Branch/UTMB Health, Galveston, TX
| | - Manisha Balwani
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY
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Sardar Pasha SPB, Shetty T, Lambert-Cheatham NA, Sishtla K, Mathew D, Muniyandi A, Patwari N, Bhatwadekar AD, Corson TW. Retinal Phenotyping of Ferrochelatase Mutant Mice Reveals Protoporphyrin Accumulation and Reduced Neovascular Response. Invest Ophthalmol Vis Sci 2021; 62:36. [PMID: 33620374 PMCID: PMC7910629 DOI: 10.1167/iovs.62.2.36] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Purpose Heme depletion, through inhibition of ferrochelatase (FECH), blocks retinal and choroidal neovascularization. Both pharmacologic FECH inhibition and a partial loss-of-function Fech mutation (Fechm1Pas) are associated with decreased neovascularization. However, the ocular physiology of Fechm1Pas mice under basal conditions has not been characterized. Here, we aimed to characterize the retinal phenotype of Fechm1Pas mice. Methods We monitored retinal vasculature at postnatal day 17, 2 months, and 6 months in Fechm1Pas homozygotes, heterozygotes, and their wild-type littermates. We characterized Fech substrate protoporphyrin (PPIX) fluorescence in the eye (excitation = 403 nm, emission = 628 nm), retinal function by electroretinogram, visual acuity by optomotor reflex, and retinal morphology by optical coherence tomography and histology. We stained vasculature using isolectin B4 and fluorescein angiography. We determined endothelial sprouting of retinal and choroidal tissue ex vivo and bioenergetics of retinal punches using a Seahorse flux analyzer. Results Fundi, retinal vasculature, venous width, and arterial tortuosity showed no aberrations. However, VEGF-induced retinal and choroidal sprouting was decreased in Fechm1Pas mutants. Homozygous Fechm1Pas mice had pronounced buildup of PPIX in the posterior eye with no damage to visual function, bioenergetics, and integrity of retinal layers. Conclusions Even with a buildup of PPIX in the retinal vessels in Fechm1Pas homozygotes, the vasculature remains normal. Notably, stimulus-induced ex vivo angiogenesis was decreased in Fechm1Pas mutants, consistent with reduced pathologic angiogenesis seen previously in neovascular animal models. Our findings indicate that Fechm1Pas mice are a useful model for studying the effects of heme deficiency on neovascularization due to Fech blockade.
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Affiliation(s)
- S P B Sardar Pasha
- Eugene and Marilyn Glick Eye Institute, Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, Indiana, United States
| | - Trupti Shetty
- Eugene and Marilyn Glick Eye Institute, Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, Indiana, United States.,Department of Pharmacology and Toxicology, Indiana University School of Medicine, Indianapolis, Indiana, United States
| | - Nathan A Lambert-Cheatham
- Eugene and Marilyn Glick Eye Institute, Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, Indiana, United States
| | - Kamakshi Sishtla
- Eugene and Marilyn Glick Eye Institute, Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, Indiana, United States
| | - Deepa Mathew
- Eugene and Marilyn Glick Eye Institute, Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, Indiana, United States
| | - Anbukkarasi Muniyandi
- Eugene and Marilyn Glick Eye Institute, Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, Indiana, United States
| | - Neeta Patwari
- Eugene and Marilyn Glick Eye Institute, Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, Indiana, United States
| | - Ashay D Bhatwadekar
- Eugene and Marilyn Glick Eye Institute, Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, Indiana, United States.,Department of Pharmacology and Toxicology, Indiana University School of Medicine, Indianapolis, Indiana, United States
| | - Timothy W Corson
- Eugene and Marilyn Glick Eye Institute, Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, Indiana, United States.,Department of Pharmacology and Toxicology, Indiana University School of Medicine, Indianapolis, Indiana, United States.,Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, Indiana, United States
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Shetty T, Sishtla K, Park B, Repass MJ, Corson TW. Heme Synthesis Inhibition Blocks Angiogenesis via Mitochondrial Dysfunction. iScience 2020; 23:101391. [PMID: 32755804 PMCID: PMC7399258 DOI: 10.1016/j.isci.2020.101391] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 04/10/2020] [Accepted: 07/17/2020] [Indexed: 01/01/2023] Open
Abstract
The relationship between heme metabolism and angiogenesis is poorly understood. The final synthesis of heme occurs in mitochondria, where ferrochelatase (FECH) inserts Fe2+ into protoporphyrin IX to produce proto-heme IX. We previously showed that FECH inhibition is antiangiogenic in human retinal microvascular endothelial cells (HRECs) and in animal models of ocular neovascularization. In the present study, we sought to understand the mechanism of how FECH and thus heme is involved in endothelial cell function. Mitochondria in endothelial cells had several defects in function after heme inhibition. FECH loss changed the shape and mass of mitochondria and led to significant oxidative stress. Oxidative phosphorylation and mitochondrial Complex IV were decreased in HRECs and in murine retina ex vivo after heme depletion. Supplementation with heme partially rescued phenotypes of FECH blockade. These findings provide an unexpected link between mitochondrial heme metabolism and angiogenesis. Heme synthesis inhibition changes mitochondrial morphology in endothelial cells Loss of heme causes buildup of mitochondrial ROS and depolarized membrane potential Endothelial cells have damaged oxidative phosphorylation and glycolysis on heme loss Damage is due to loss of heme-containing Complex IV, restored by exogenous heme
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Affiliation(s)
- Trupti Shetty
- Eugene and Marilyn Glick Eye Institute, Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, IN 46202, USA; Department of Pharmacology & Toxicology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Kamakshi Sishtla
- Eugene and Marilyn Glick Eye Institute, Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Bomina Park
- Eugene and Marilyn Glick Eye Institute, Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, IN 46202, USA; Department of Pharmacology & Toxicology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Matthew J Repass
- Angio BioCore, Indiana University School of Medicine, Indianapolis, IN 46202, USA; Melvin and Bren Simon Cancer Center, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Timothy W Corson
- Eugene and Marilyn Glick Eye Institute, Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, IN 46202, USA; Department of Pharmacology & Toxicology, Indiana University School of Medicine, Indianapolis, IN 46202, USA; Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA; Melvin and Bren Simon Cancer Center, Indiana University School of Medicine, Indianapolis, IN 46202, USA.
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Laafi J, Homedan C, Jacques C, Gueguen N, Schmitt C, Puy H, Reynier P, Carmen Martinez M, Malthièry Y. Pro-oxidant effect of ALA is implicated in mitochondrial dysfunction of HepG2 cells. Biochimie 2014; 106:157-66. [PMID: 25220386 DOI: 10.1016/j.biochi.2014.08.014] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2014] [Accepted: 08/22/2014] [Indexed: 12/16/2022]
Abstract
Heme biosynthesis begins in the mitochondrion with the formation of delta-aminolevulinic acid (ALA). In acute intermittent porphyria, hereditary tyrosinemia type I and lead poisoning patients, ALA is accumulated in plasma and in organs, especially the liver. These diseases are also associated with neuromuscular dysfunction and increased incidence of hepatocellular carcinoma. Many studies suggest that this damage may originate from ALA-induced oxidative stress following its accumulation. Using the MnSOD as an oxidative stress marker, we showed here that ALA treatment of cultured cells induced ROS production, increasing with ALA concentration. The mitochondrial energetic function of ALA-treated HepG2 cells was further explored. Mitochondrial respiration and ATP content were reduced compared to control cells. For the 300 μM treatment, ALA induced a mitochondrial mass decrease and a mitochondrial network imbalance although neither necrosis nor apoptosis were observed. The up regulation of PGC-1, Tfam and ND5 genes was also found; these genes encode mitochondrial proteins involved in mitochondrial biogenesis activation and OXPHOS function. We propose that ALA may constitute an internal bioenergetic signal, which initiates a coordinated upregulation of respiratory genes, which ultimately drives mitochondrial metabolic adaptation within cells. The addition of an antioxidant, Manganese(III) tetrakis(1-methyl-4-pyridyl)porphyrin (MnTMPyP), resulted in improvement of maximal respiratory chain capacity with 300 μM ALA. Our results suggest that mitochondria, an ALA-production site, are more sensitive to pro-oxidant effect of ALA, and may be directly involved in pathophysiology of patients with inherited or acquired porphyria.
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Affiliation(s)
- Jihane Laafi
- LUNAM Université, INSERM UMR 1063, IBIS, IRIS, rue des capucins, 49100 Angers, France.
| | - Chadi Homedan
- LUNAM Université, INSERM UMR 1063, IBIS, IRIS, rue des capucins, 49100 Angers, France; Centre Hospitalier Universitaire, Département de Biochimie et Génétique, IBIS, IRIS, rue des capucins, 49100 Angers, France.
| | - Caroline Jacques
- LUNAM Université, INSERM UMR 1063, IBIS, IRIS, rue des capucins, 49100 Angers, France.
| | - Naig Gueguen
- Centre Hospitalier Universitaire, Département de Biochimie et Génétique, IBIS, IRIS, rue des capucins, 49100 Angers, France; CNRS UMR 6214 - INSERM 1083, IBIS, IRIS, rue des capucins, 49100 Angers, France.
| | - Caroline Schmitt
- Assistance Publique Hôpitaux de Paris, Centre Français des Porphyries, Hôpital Louis Mourier, Université Paris Diderot, 178 rue des Renouillers, 92700 Colombes, France; INSERM U773, Centre de Recherche Biomédicale Bichat-Beaujon, Paris, France; Université Paris Diderot, 5 Rue Thomas Mann, 75013 Paris, France.
| | - Hervé Puy
- Assistance Publique Hôpitaux de Paris, Centre Français des Porphyries, Hôpital Louis Mourier, Université Paris Diderot, 178 rue des Renouillers, 92700 Colombes, France; INSERM U773, Centre de Recherche Biomédicale Bichat-Beaujon, Paris, France; Université Paris Diderot, 5 Rue Thomas Mann, 75013 Paris, France.
| | - Pascal Reynier
- Centre Hospitalier Universitaire, Département de Biochimie et Génétique, IBIS, IRIS, rue des capucins, 49100 Angers, France; CNRS UMR 6214 - INSERM 1083, IBIS, IRIS, rue des capucins, 49100 Angers, France.
| | - Maria Carmen Martinez
- LUNAM Université, INSERM UMR 1063, IBIS, IRIS, rue des capucins, 49100 Angers, France.
| | - Yves Malthièry
- LUNAM Université, INSERM UMR 1063, IBIS, IRIS, rue des capucins, 49100 Angers, France; Centre Hospitalier Universitaire, Département de Biochimie et Génétique, IBIS, IRIS, rue des capucins, 49100 Angers, France.
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Nikam A, Patankar JV, Lackner C, Schöck E, Kratky D, Zatloukal K, Abuja PM. Transition between acute and chronic hepatotoxicity in mice is associated with impaired energy metabolism and induction of mitochondrial heme oxygenase-1. PLoS One 2013; 8:e66094. [PMID: 23762471 PMCID: PMC3675145 DOI: 10.1371/journal.pone.0066094] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Accepted: 05/02/2013] [Indexed: 02/07/2023] Open
Abstract
The formation of protein inclusions is frequently associated with chronic metabolic diseases. In mice, short-term intoxication with 3,5-diethoxycarbonyl-1,4-dihydrocollidine (DDC) leads to hepatocellular damage indicated by elevated serum liver enzyme activities, whereas only minor morphological changes are observed. Conversely, chronic administration of DDC for several weeks results in severe morphological damage, characterized by hepatocellular ballooning, disruption of the intermediate filament cytoskeleton, and formation of Mallory-Denk bodies consisting predominantly of misfolded keratins, Sqstm1/p62, and heat shock proteins. To evaluate the mechanistic underpinnings for this dichotomy we dissected the time-course of DDC intoxication for up to 10 weeks. We determined body weight change, serum liver enzyme activities, morphologic alterations, induction of antioxidant response (heme oxygenase-1, HO-1), oxidative damage and ATP content in livers as well as respiration, oxidative damage and the presence and activity of HO-1 in endoplasmic reticulum and mitochondria (mtHO-1). Elevated serum liver enzyme activity and oxidative liver damage were already present at early intoxication stages without further subsequent increase. After 2 weeks of intoxication, mice had transiently lost 9% of their body weight, liver ATP-content was reduced to 58% of controls, succinate-driven respiration was uncoupled from ATP-production and antioxidant response was associated with the appearance of catalytically active mtHO-1. Oxidative damage was associated with both acute and chronic DDC toxicity whereas the onset of chronic intoxication was specifically associated with mitochondrial dysfunction which was maximal after 2 weeks of intoxication. At this transition stage, adaptive responses involving mtHO-1 were induced, indirectly leading to improved respiration and preventing further drop of ATP levels. Our observations clearly demonstrate principally different mechanisms for acute and chronic toxic damage.
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Affiliation(s)
- Aniket Nikam
- Institute of Pathology, Medical University of Graz, Graz, Austria
| | - Jay V. Patankar
- Institute of Molecular Biology and Biochemistry, Medical University of Graz, Graz, Austria
| | - Carolin Lackner
- Institute of Pathology, Medical University of Graz, Graz, Austria
| | - Elisabeth Schöck
- Institute of Pathology, Medical University of Graz, Graz, Austria
| | - Dagmar Kratky
- Institute of Molecular Biology and Biochemistry, Medical University of Graz, Graz, Austria
| | - Kurt Zatloukal
- Institute of Pathology, Medical University of Graz, Graz, Austria
| | - Peter M. Abuja
- Institute of Pathology, Medical University of Graz, Graz, Austria
- * E-mail:
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Bloomer J, Wang Y, Chen D. Level of Expression of the Nonmutant FerrochelataseAllele is a Determinant of Biochemical Phenotype in a Mouse Model of Erythropoietic Protoporphyria. GENE REGULATION AND SYSTEMS BIOLOGY 2008; 2:233-41. [PMID: 19787086 PMCID: PMC2733089 DOI: 10.4137/grsb.s636] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Ferrochelatase (FECH) activity is decreased in erythropoietic protoporphyria (EPP), causing increased production and excretion of protoporphyrin. This study examined whether the level of expression of the nonmutant FECH allele is a determinant of phenotype in a mouse model of EPP that carries a heterozygous deletion of exon 10 in FECH. Two mice strains that had a two-fold difference in FECH mRNA levels in bone marrow and liver (low expressing C3H/HeJ and high expressing CBA/J) were used to establish congenic strains containing the mutation. Erythrocyte protoporphyrin levels in C3H/HeJ heterozygous mice were significantly higher than in their wildtype littermates, whereas levels in CBA/J heterozygous mice did not differ significantly from their wildtype littermates. Biliary excretion of protoporphyrin was also significantly higher in C3H/HeJ heterozygous mice. The levels of normal FECH mRNA in bone marrow measured by real time PCR were 138 +/− 30 copies per ug total RNA in C3H/HeJ +/− mice, 320 +/− 59 in C3H/HeJ +/+ mice and 634 +/− 38 in CBA/J +/+ mice. Levels in liver tissue of the mice differed significantly in the same pattern. Thus, the level of expression of the nonmutant FECH allele is a determinant of phenotype in a mouse model of EPP as has been demonstrated in human EPP.
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Affiliation(s)
| | | | - Dongquan Chen
- Division of Hematology/Oncology Department of Medicine, University of Alabama at Birmingham School of Medicine, Birmingham, Alabama
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Alonso J, Rodriguez JM, Baena-López LA, Santarén JF. Characterization of the Drosophila melanogaster mitochondrial proteome. J Proteome Res 2006; 4:1636-45. [PMID: 16212416 DOI: 10.1021/pr050130c] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
We have combined high-resolution two-dimensional (2-D) gel electrophoresis with mass spectrometry with the aim of identifying proteins represented in the 2-D gel database of Drosophila melanogaster mitochondria. First, we purified mitochondria from third instar Drosophila larvae and constructed a high-resolution 2-D gel database containing 231 silver-stained polypeptides. Next, we carried out preparative 2-D PAGE to isolate some of the polypeptides and characterize them by MALDI-TOF analysis. Using this strategy, we identified 66 mitochondrial spots in the database, and in each case confirmed their identity by MALDI-TOF/TOF analysis. In addition, we generated antibodies against two of the mitochondrial proteins as tools for characterizing the organelle.
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Affiliation(s)
- Jana Alonso
- Centro de Biología Molecular Severo Ochoa, CSIC-UAM, Universidad Autónoma de Madrid, Cantoblanco, 28049-Madrid, Spain
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Chernova T, Nicotera P, Smith AG. Heme Deficiency Is Associated with Senescence and Causes Suppression ofN-Methyl-d-aspartate Receptor Subunits Expression in Primary Cortical Neurons. Mol Pharmacol 2005; 69:697-705. [PMID: 16306232 DOI: 10.1124/mol.105.016675] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Heme is a crucial component of many pharmacological and toxicological processes, and studies have suggested that heme deficiency may play a role in cellular ageing. A model of ageing neurons was established using prolonged cultures of BALB/c mouse primary cortical neurons. Aged neurons displayed a senescent phenotype and a marked up-regulation of cathepsin-L expression. Down-regulation of the candidate neuron-specific genes for N-methyl-D-aspartate (NMDA) receptor subunits (NMDAzeta1 and -epsilon2) and neurofilament light peptide (NF-L) were found to be characteristic of the aging process as reported in vivo (Brain Res 907:71-83, 2001; Brain Res Mol Brain Res 99:40-45, 2002). In contrast, the genes for the controlling enzymes of heme synthesis and degradation (5-aminolevulinate synthase 1 and heme oxygenase 1, respectively) were up-regulated, implying depletion of a regulatory heme pool. Inhibition of heme synthesis (by 70-80%) at different enzymic steps by succinyl acetone and N-methylprotoporphyrin IX resulted in the earlier lowered expression of NMDAzeta1 and -epsilon2 and NF-L. Exogenous hemin added to heme-depleted cells rescued the expression of these neuron-specific genes. Culture of cortical neurons from BALB/c Fech(m1Pas) mutant mice demonstrating depressed heme synthesis showed premature senescence and reduced expression of NMDAzeta1 and -epsilon2 receptor subunits and NF-L compared with wild-type cells. Our findings suggest that reduced availability of heme in neurons associated with senescence may have significant effects on synaptic function.
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Affiliation(s)
- Tatyana Chernova
- MRC Toxicology Unit, University of Leicester, Hodgkin Building, Lancaster Road, Leicester LE1 9HN, UK.
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Abitbol M, Bernex F, Puy H, Jouault H, Deybach JC, Guénet JL, Montagutelli X. A mouse model provides evidence that genetic background modulates anemia and liver injury in erythropoietic protoporphyria. Am J Physiol Gastrointest Liver Physiol 2005; 288:G1208-16. [PMID: 15677551 DOI: 10.1152/ajpgi.00505.2004] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Erythropoietic protoporphyria is an inherited disorder of heme biosynthesis caused by partial ferrochelatase deficiency, resulting in protoporphyrin (PP) overproduction by erythrocytes. In humans, it is responsible for painful skin photosensitivity and, occasionally, liver failure due to accumulation of PP in the liver. The ferrochelatase deficiency mouse mutation is the best animal model available for human erythropoietic protoporphyria. The original description, based on mice with a BALB/cByJCrl genetic background, reported a disease resembling the severe form of the human disease, with anemia, jaundice, and liver failure. Using congenic strains, we investigated the effect of genetic background on the severity of the phenotype. Compared with BALB/cByJCrl, C57BL/6JCrl mice developed moderate but increasing anemia and intense liver accumulation of PP with severe hepatocyte damage and loss. Bile excretory function was not affected, and bilirubin remained low. Despite the highest PP concentration in erythrocytes, anemia was mild and there were few PP deposits in the liver in SJL/JOrlCrl homozygotes. Discriminant analysis using six hematologic and biochemical parameters showed that homozygotes of the three genetic backgrounds could be clustered in three well-separated groups. These three congenic strains provide strong evidence for independent genetic control of bone marrow contribution of PP overproduction to development of liver disease and biliary PP excretion. They provide a tool to investigate the physiological mechanisms involved in these phenotypic differences and to identify modifying genes.
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Affiliation(s)
- Marie Abitbol
- Unité de Génétique des Mammifères, Institut Pasteur 25, rue du Docteur Roux, 75724 Paris cedex 15, France
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