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Maurya M, Liu CH, Bora K, Kushwah N, Pavlovich MC, Wang Z, Chen J. Animal Models of Retinopathy of Prematurity: Advances and Metabolic Regulators. Biomedicines 2024; 12:1937. [PMID: 39335451 PMCID: PMC11428941 DOI: 10.3390/biomedicines12091937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2024] [Revised: 08/08/2024] [Accepted: 08/15/2024] [Indexed: 09/30/2024] Open
Abstract
Retinopathy of prematurity (ROP) is a primary cause of visual impairment and blindness in premature newborns, characterized by vascular abnormalities in the developing retina, with microvascular alteration, neovascularization, and in the most severe cases retinal detachment. To elucidate the pathophysiology and develop therapeutics for ROP, several pre-clinical experimental models of ROP were developed in different species. Among them, the oxygen-induced retinopathy (OIR) mouse model has gained the most popularity and critically contributed to our current understanding of pathological retinal angiogenesis and the discovery of potential anti-angiogenic therapies. A deeper comprehension of molecular regulators of OIR such as hypoxia-inducible growth factors including vascular endothelial growth factors as primary perpetrators and other new metabolic modulators such as lipids and amino acids influencing pathological retinal angiogenesis is also emerging, indicating possible targets for treatment strategies. This review delves into the historical progressions that gave rise to the modern OIR models with a focus on the mouse model. It also reviews the fundamental principles of OIR, recent advances in its automated assessment, and a selected summary of metabolic investigation enabled by OIR models including amino acid transport and metabolism.
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Affiliation(s)
| | | | | | | | | | | | - Jing Chen
- Department of Ophthalmology, Boston Children’s Hospital, Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115, USA
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Gillingham MB, Choi D, Gregor A, Wongchaisuwat N, Black D, Scanga HL, Nischal KK, Sahel JA, Arnold G, Vockley J, Harding CO, Pennesi ME. Early diagnosis and treatment by newborn screening (NBS) or family history is associated with improved visual outcomes for long-chain 3-hydroxyacylCoA dehydrogenase deficiency (LCHADD) chorioretinopathy. J Inherit Metab Dis 2024; 47:746-756. [PMID: 38623632 PMCID: PMC11251862 DOI: 10.1002/jimd.12738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Revised: 03/26/2024] [Accepted: 03/27/2024] [Indexed: 04/17/2024]
Abstract
Long chain 3-hydroxyacyl-CoA dehydrogenase (LCHADD) is the only fatty acid oxidation disorder to develop a progressive chorioretinopathy resulting in vision loss; newborn screening (NBS) for this disorder began in the United States around 2004. We compared visual outcomes among 40 participants with LCHADD or trifunctional protein deficiency diagnosed symptomatically to those who were diagnosed via NBS or a family history. Participants completed ophthalmologic testing including measures of visual acuity, electroretinograms (ERG), fundal imaging, contrast sensitivity, and visual fields. Records were reviewed to document medical and treatment history. Twelve participants presented symptomatically with hypoglycemia, failure to thrive, liver dysfunction, cardiac arrest, or rhabdomyolysis. Twenty eight were diagnosed by NBS or due to a family history of LCHADD. Participants diagnosed symptomatically were older but had similar percent males and genotypes as those diagnosed by NBS. Treatment consisted of fasting avoidance, dietary long-chain fat restriction, MCT, C7, and/or carnitine supplementation. Visual acuity, rod- and cone-driven amplitudes on ERG, contrast sensitivity scores, and visual fields were all significantly worse among participants diagnosed symptomatically compared to NBS. In mixed-effects models, both age and presentation (symptomatic vs. NBS) were significant independent factors associated with visual outcomes. This suggests that visual outcomes were improved by NBS, but there was still lower visual function with advancing age in both groups. Early diagnosis and treatment by NBS is associated with improved visual outcomes and retinal function compared to participants who presented symptomatically. Despite the impact of early intervention, chorioretinopathy was greater with advancing age, highlighting the need for novel treatments.
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Affiliation(s)
- Melanie B Gillingham
- Department of Molecular and Medical Genetics, Oregon Health & Science University, Portland, Oregon, USA
| | - Dongseok Choi
- OHSU-PSU School of Public Health, Biostatistics, Oregon Health & Science University, Portland, Oregon, USA
- Casey Eye Institute, Oregon Health & Science University, Portland, Oregon, USA
| | - Ashley Gregor
- Department of Molecular and Medical Genetics, Oregon Health & Science University, Portland, Oregon, USA
| | - Nida Wongchaisuwat
- Casey Eye Institute, Oregon Health & Science University, Portland, Oregon, USA
| | - Danielle Black
- Division of Genetic and Genomic Medicine, University of Pittsburgh Medical Center Children’s Hospital of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Hannah L Scanga
- Department of Ophthalmology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Ken K Nischal
- Department of Ophthalmology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Jose-Alain Sahel
- Department of Ophthalmology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Georgianne Arnold
- Division of Genetic and Genomic Medicine, University of Pittsburgh Medical Center Children’s Hospital of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Jerry Vockley
- Division of Genetic and Genomic Medicine, University of Pittsburgh Medical Center Children’s Hospital of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Cary O Harding
- Department of Molecular and Medical Genetics, Oregon Health & Science University, Portland, Oregon, USA
| | - Mark E Pennesi
- Casey Eye Institute, Oregon Health & Science University, Portland, Oregon, USA
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Mütze U, Ottenberger A, Gleich F, Maier EM, Lindner M, Husain RA, Palm K, Beblo S, Freisinger P, Santer R, Thimm E, vom Dahl S, Weinhold N, Grohmann‐Held K, Haase C, Hennermann JB, Hörbe‐Blindt A, Kamrath C, Marquardt I, Marquardt T, Behne R, Haas D, Spiekerkoetter U, Hoffmann GF, Garbade SF, Grünert SC, Kölker S. Neurological outcome in long-chain hydroxy fatty acid oxidation disorders. Ann Clin Transl Neurol 2024; 11:883-898. [PMID: 38263760 PMCID: PMC11021608 DOI: 10.1002/acn3.52002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Accepted: 01/04/2024] [Indexed: 01/25/2024] Open
Abstract
OBJECTIVE This study aims to elucidate the long-term benefit of newborn screening (NBS) for individuals with long-chain 3-hydroxy-acyl-CoA dehydrogenase (LCHAD) and mitochondrial trifunctional protein (MTP) deficiency, inherited metabolic diseases included in NBS programs worldwide. METHODS German national multicenter study of individuals with confirmed LCHAD/MTP deficiency identified by NBS between 1999 and 2020 or selective metabolic screening. Analyses focused on NBS results, confirmatory diagnostics, and long-term clinical outcomes. RESULTS Sixty-seven individuals with LCHAD/MTP deficiency were included in the study, thereof 54 identified by NBS. All screened individuals with LCHAD deficiency survived, but four with MTP deficiency (14.8%) died during the study period. Despite NBS and early treatment neonatal decompensations (28%), symptomatic disease course (94%), later metabolic decompensations (80%), cardiomyopathy (28%), myopathy (82%), hepatopathy (32%), retinopathy (17%), and/or neuropathy (22%) occurred. Hospitalization rates were high (up to a mean of 2.4 times/year). Disease courses in screened individuals with LCHAD and MTP deficiency were similar except for neuropathy, occurring earlier in individuals with MTP deficiency (median 3.9 vs. 11.4 years; p = 0.0447). Achievement of dietary goals decreased with age, from 75% in the first year of life to 12% at age 10, and consensus group recommendations on dietary management were often not achieved. INTERPRETATION While NBS and early treatment result in improved (neonatal) survival, they cannot reliably prevent long-term morbidity in screened individuals with LCHAD/MTP deficiency, highlighting the urgent need of better therapeutic strategies and the development of disease course-altering treatment.
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Affiliation(s)
- Ulrike Mütze
- Medical Faculty of Heidelberg, Center for Child and Adolescent Medicine, Division of Child Neurology and Metabolic MedicineHeidelberg UniversityHeidelbergGermany
| | - Alina Ottenberger
- Medical Faculty of Heidelberg, Center for Child and Adolescent Medicine, Division of Child Neurology and Metabolic MedicineHeidelberg UniversityHeidelbergGermany
| | - Florian Gleich
- Medical Faculty of Heidelberg, Center for Child and Adolescent Medicine, Division of Child Neurology and Metabolic MedicineHeidelberg UniversityHeidelbergGermany
| | - Esther M. Maier
- Dr. von Hauner Children's Hospital, Ludwig‐Maximilians‐UniversityMunichGermany
| | - Martin Lindner
- Division of Pediatric NeurologyUniversity Children's Hospital FrankfurtFrankfurtGermany
| | - Ralf A. Husain
- Center for Inborn Metabolic Disorders, Department of NeuropediatricsJena University HospitalJenaGermany
| | - Katja Palm
- Division of Endocrinology, Diabetology and Metabolic MedicineUniversity Children's HospitalMagdeburgGermany
| | - Skadi Beblo
- Department of Women and Child Health, Hospital for Children and Adolescents, Center for Pediatric Research Leipzig (CPL)University Hospitals, University of LeipzigLeipzigGermany
| | - Peter Freisinger
- Children's Hospital Reutlingen, Klinikum am SteinenbergReutlingenGermany
| | - René Santer
- University Medical Center Hamburg‐Eppendorf, University Children's HospitalHamburgGermany
| | - Eva Thimm
- Department of General Pediatrics, Neonatology, and Pediatric CardiologyUniversity Children's Hospital, Heinrich Heine University DüsseldorfDüsseldorfGermany
| | - Stephan vom Dahl
- Department of Gastroenterology, Hepatology and Infectious DiseasesUniversity Hospital, Heinrich Heine University DüsseldorfDüsseldorfGermany
| | - Natalie Weinhold
- Department of Pediatric Gastroenterology, Nephrology and Metabolic Diseases, Center of Chronically Sick ChildrenCharité ‐ Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt‐Universität zu BerlinBerlinGermany
| | - Karina Grohmann‐Held
- Department of Pediatrics and Adolescent MedicineUniversity Medicine GreifswaldGreifswaldGermany
| | - Claudia Haase
- Department of Pediatrics and Adolescent MedicineHelios Hospital ErfurtErfurtGermany
| | - Julia B. Hennermann
- Villa Metabolica, Center for Pediatric and Adolescent MedicineMainz University Medical CenterMainzGermany
| | | | - Clemens Kamrath
- Department of General Pediatrics and NeonatologyUniversity Hospital of Gießen and MarburgGießenGermany
| | - Iris Marquardt
- Department of Child NeurologyChildren's Hospital OldenburgOldenburgGermany
| | - Thorsten Marquardt
- Department of General Pediatrics, Metabolic DiseasesUniversity Children's Hospital MuensterMuensterGermany
| | - Robert Behne
- Medical Faculty of Heidelberg, Center for Child and Adolescent Medicine, Division of Child Neurology and Metabolic MedicineHeidelberg UniversityHeidelbergGermany
| | - Dorothea Haas
- Medical Faculty of Heidelberg, Center for Child and Adolescent Medicine, Division of Child Neurology and Metabolic MedicineHeidelberg UniversityHeidelbergGermany
| | - Ute Spiekerkoetter
- Department of General Pediatrics, Adolescent Medicine and NeonatologyMedical Center ‐ University of Freiburg, Faculty of MedicineFreiburgGermany
| | - Georg F. Hoffmann
- Medical Faculty of Heidelberg, Center for Child and Adolescent Medicine, Division of Child Neurology and Metabolic MedicineHeidelberg UniversityHeidelbergGermany
| | - Sven F. Garbade
- Medical Faculty of Heidelberg, Center for Child and Adolescent Medicine, Division of Child Neurology and Metabolic MedicineHeidelberg UniversityHeidelbergGermany
| | - Sarah C. Grünert
- Department of General Pediatrics, Adolescent Medicine and NeonatologyMedical Center ‐ University of Freiburg, Faculty of MedicineFreiburgGermany
| | - Stefan Kölker
- Medical Faculty of Heidelberg, Center for Child and Adolescent Medicine, Division of Child Neurology and Metabolic MedicineHeidelberg UniversityHeidelbergGermany
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Wongchaisuwat N, Gillingham MB, Yang P, Everett L, Gregor A, Harding CO, Sahel JA, Nischal KK, Scanga HL, Black D, Vockley J, Arnold G, Pennesi ME. A proposal for an updated staging system for LCHADD retinopathy. Ophthalmic Genet 2024; 45:140-146. [PMID: 38288966 PMCID: PMC11010772 DOI: 10.1080/13816810.2024.2303682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Accepted: 01/05/2024] [Indexed: 04/04/2024]
Abstract
OBJECTIVE To develop an updated staging system for long-chain 3-hydroxyacyl coenzyme A dehydrogenase deficiency (LCHADD) chorioretinopathy based on contemporary multimodal imaging and electrophysiology. METHODS We evaluated forty cases of patients with genetically confirmed LCHADD or trifunctional protein deficiency (TFPD) enrolled in a prospective natural history study. Wide-field fundus photographs, fundus autofluorescence (FAF), optical coherence tomography (OCT), and full-field electroretinogram (ffERG) were reviewed and graded for severity. RESULTS Two independent experts first graded fundus photos and electrophysiology to classify the stage of chorioretinopathy based upon an existing published system. With newer imaging modalities and improved electrophysiology, many patients did not fit cleanly into a single traditional staging group. Therefore, we developed a novel staging system that better delineated the progression of LCHADD retinopathy. We maintained the four previous delineated stages but created substages A and B in stages 2 to 3 to achieve better differentiation. DISCUSSION Previous staging systems of LCHADD chorioretinopathy relied on only on the assessment of standard 30 to 45-degree fundus photographs, visual acuity, fluorescein angiography (FA), and ffERG. Advances in recordings of ffERG and multimodal imaging with wider fields of view, allow better assessment of retinal changes. Following these advanced assessments, seven patients did not fit neatly into the original classification system and were therefore recategorized under the new proposed system. CONCLUSION The new proposed staging system improves the classification of LCHADD chorioretinopathy, with the potential to lead to a deeper understanding of the disease's progression and serve as a more reliable reference point for future therapeutic research.
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Affiliation(s)
- Nida Wongchaisuwat
- Casey Eye Institute, Department of Ophthalmology, Oregon Health & Science University, Portland, Oregon, USA
- Department of Ophthalmology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Melanie B. Gillingham
- Department of Molecular and Medical Genetics, Oregon Health and Science University, Portland, Oregon, USA
| | - Paul Yang
- Casey Eye Institute, Department of Ophthalmology, Oregon Health & Science University, Portland, Oregon, USA
| | - Lesley Everett
- Casey Eye Institute, Department of Ophthalmology, Oregon Health & Science University, Portland, Oregon, USA
- Department of Molecular and Medical Genetics, Oregon Health and Science University, Portland, Oregon, USA
| | - Ashley Gregor
- Department of Molecular and Medical Genetics, Oregon Health and Science University, Portland, Oregon, USA
| | - Cary O. Harding
- Department of Molecular and Medical Genetics, Oregon Health and Science University, Portland, Oregon, USA
| | - Jose Alain Sahel
- Department of Ophthalmology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA
| | - Ken K. Nischal
- Department of Ophthalmology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA
| | - Hannah L. Scanga
- Department of Ophthalmology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA
| | - Danielle Black
- Division of Genetic and Genomic Medicine, University of Pittsburgh Medical Center Children’s Hospital, Pittsburgh, Pennsylvania, USA
| | - Jerry Vockley
- Division of Genetic and Genomic Medicine, University of Pittsburgh Medical Center Children’s Hospital, Pittsburgh, Pennsylvania, USA
| | - Georgianne Arnold
- Division of Genetic and Genomic Medicine, University of Pittsburgh Medical Center Children’s Hospital, Pittsburgh, Pennsylvania, USA
| | - Mark E. Pennesi
- Casey Eye Institute, Department of Ophthalmology, Oregon Health & Science University, Portland, Oregon, USA
- Department of Molecular and Medical Genetics, Oregon Health and Science University, Portland, Oregon, USA
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Wongchaisuwat N, Wang J, Yang P, Everett L, Gregor A, Sahel JA, Nischal KK, Pennesi ME, Gillingham MB, Jia Y. Optical coherence tomography angiography of choroidal neovascularization in long-chain 3-hydroxyacyl-CoA dehydrogenase deficiency (LCHADD). Am J Ophthalmol Case Rep 2023; 32:101958. [PMID: 38161518 PMCID: PMC10757195 DOI: 10.1016/j.ajoc.2023.101958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2023] [Revised: 10/26/2023] [Accepted: 11/02/2023] [Indexed: 01/03/2024] Open
Abstract
Purpose To report the clinical utility of optical coherence tomography angiography (OCTA) for demonstrating choroidal neovascularization (CNV) associated with Long-Chain 3-Hydroxyacyl-CoA Dehydrogenase Deficiency (LCHADD) retinopathy. Methods Thirty-three participants with LCHADD (age 7-36 years; median 17) were imaged with OCTA and the Center for Ophthalmic Optics & Lasers Angiography Reading Toolkit (COOL-ART) software was implemented to process OCTA scans. Results Seven participants (21 %; age 17-36 years; median 25) with LCHADD retinopathy demonstrated evidence of CNV by retinal examination or presence of CNV within outer retinal tissue on OCTA scans covering 3 × 3 and/or 6 × 6-mm. These sub-clinical CNVs are adjacent to hyperpigmented areas in the posterior pole. CNV presented at stage 2 or later of LCHADD retinopathy prior to the disappearance of RPE pigment in the macula. Conclusion OCTA can be applied as a non-invasive method to evaluate the retinal and choroidal microvasculature. OCTA can reveal CNV in LCHADD even when the clinical exam is inconclusive. These data suggest that the incidence of CNV is greater than expected and can occur even in the early stages of LCHADD retinopathy.
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Affiliation(s)
- Nida Wongchaisuwat
- Casey Eye Institute, Department of Ophthalmology, Oregon Health & Science University, Portland, OR, USA
- Department of Ophthalmology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Jie Wang
- Casey Eye Institute, Department of Ophthalmology, Oregon Health & Science University, Portland, OR, USA
| | - Paul Yang
- Casey Eye Institute, Department of Ophthalmology, Oregon Health & Science University, Portland, OR, USA
| | - Lesley Everett
- Casey Eye Institute, Department of Ophthalmology, Oregon Health & Science University, Portland, OR, USA
- Department of Molecular and Medical Genetics, Oregon Health and Science University, Portland, OR, USA
| | - Ashley Gregor
- Department of Molecular and Medical Genetics, Oregon Health and Science University, Portland, OR, USA
| | - Jose Alain Sahel
- Vision Institute, University of Pittsburgh Medical Center and School of Medicine, Pennsylvania, USA
| | - Ken K. Nischal
- Vision Institute, University of Pittsburgh Medical Center and School of Medicine, Pennsylvania, USA
- UPMC Children's Hospital, Pennsylvania, USA
| | - Mark E. Pennesi
- Casey Eye Institute, Department of Ophthalmology, Oregon Health & Science University, Portland, OR, USA
- Department of Molecular and Medical Genetics, Oregon Health and Science University, Portland, OR, USA
| | - Melanie B. Gillingham
- Department of Molecular and Medical Genetics, Oregon Health and Science University, Portland, OR, USA
| | - Yali Jia
- Casey Eye Institute, Department of Ophthalmology, Oregon Health & Science University, Portland, OR, USA
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Ulhaq ZS, Ogino Y, Tse WKF. Deciphering the pathogenesis of retinopathy associated with carnitine palmitoyltransferase I deficiency in zebrafish model. Biochem Biophys Res Commun 2023; 664:100-107. [PMID: 37141637 DOI: 10.1016/j.bbrc.2023.04.096] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2023] [Accepted: 04/25/2023] [Indexed: 05/06/2023]
Abstract
Fatty acid oxidation disorders (FAODs) are a group of rare genetic metabolic disorders caused by mutations in genes responsible for transporting and metabolizing fatty acids in the mitochondria. One crucial enzyme involved in this process is carnitine palmitoyltransferase I (CPT1), which transports long-chain fatty acids to the mitochondrial matrix for beta-oxidation. Defects in beta-oxidation enzymes often lead to pigmentary retinopathy; however, the underlying mechanisms are not entirely understood. To investigate FAOD and its impact on the retina, we employed zebrafish as a model organism. Specifically, we used antisense-mediated knockdown strategies to target the cpt1a gene and examined the resulting retinal phenotypes. We demonstrated that the cpt1a MO-injected fish significantly reduced the length of connecting cilia and severely affected photoreceptor cell development. Moreover, our findings highlight that the loss of functional cpt1a disrupted energy homeostasis in the retina, leading to lipid droplet deposition and promoting ferroptosis, which is likely attributed to the photoreceptor degeneration and visual impairments observed in the cpt1a morphants.
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Affiliation(s)
- Zulvikar Syambani Ulhaq
- Laboratory of Developmental Disorders and Toxicology, Center for Promotion of International Education and Research, Faculty of Agriculture, Kyushu University, Fukuoka, Japan; Research Center for Pre-clinical and Clinical Medicine, National Research and Innovation Agency, Cibinong, Indonesia.
| | - Yukiko Ogino
- Laboratory of Aquatic Molecular Developmental Biology, Center for Promotion of International Education and Research, Faculty of Agriculture, Kyushu University, Fukuoka, Japan
| | - William Ka Fai Tse
- Laboratory of Developmental Disorders and Toxicology, Center for Promotion of International Education and Research, Faculty of Agriculture, Kyushu University, Fukuoka, Japan.
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Sinha T, Ikelle L, Makia MS, Crane R, Zhao X, Kakakhel M, Al-Ubaidi MR, Naash MI. Riboflavin deficiency leads to irreversible cellular changes in the RPE and disrupts retinal function through alterations in cellular metabolic homeostasis. Redox Biol 2022; 54:102375. [PMID: 35738087 PMCID: PMC9233280 DOI: 10.1016/j.redox.2022.102375] [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: 04/12/2022] [Revised: 06/13/2022] [Accepted: 06/14/2022] [Indexed: 10/25/2022] Open
Abstract
Ariboflavinosis is a pathological condition occurring as a result of riboflavin deficiency. This condition is treatable if detected early enough, but it lacks timely diagnosis. Critical symptoms of ariboflavinosis include neurological and visual manifestations, yet the effects of flavin deficiency on the retina are not well investigated. Here, using a diet induced mouse model of riboflavin deficiency, we provide the first evidence of how retinal function and metabolism are closely intertwined with riboflavin homeostasis. We find that diet induced riboflavin deficiency causes severe decreases in retinal function accompanied by structural changes in the neural retina and retinal pigment epithelium (RPE). This is preceded by increased signs of cellular oxidative stress and metabolic disorder, in particular dysregulation in lipid metabolism, which is essential for both photoreceptors and the RPE. Though many of these deleterious phenotypes can be ameliorated by riboflavin supplementation, our data suggests that some patients may continue to suffer from multiple pathologies at later ages. These studies provide an essential cellular and mechanistic foundation linking defects in cellular flavin levels with the manifestation of functional deficiencies in the visual system and paves the way for a more in-depth understanding of the cellular consequences of ariboflavinosis.
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Affiliation(s)
- Tirthankar Sinha
- Department of Biomedical Engineering, University of Houston, Houston, TX, 77204, USA
| | - Larissa Ikelle
- Department of Biomedical Engineering, University of Houston, Houston, TX, 77204, USA
| | - Mustafa S Makia
- Department of Biomedical Engineering, University of Houston, Houston, TX, 77204, USA
| | - Ryan Crane
- Department of Biomedical Engineering, University of Houston, Houston, TX, 77204, USA
| | - Xue Zhao
- Department of Biomedical Engineering, University of Houston, Houston, TX, 77204, USA
| | - Mashal Kakakhel
- Department of Biomedical Engineering, University of Houston, Houston, TX, 77204, USA
| | - Muayyad R Al-Ubaidi
- Department of Biomedical Engineering, University of Houston, Houston, TX, 77204, USA.
| | - Muna I Naash
- Department of Biomedical Engineering, University of Houston, Houston, TX, 77204, USA.
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8
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Dessein AF, Hebbar E, Vamecq J, Lebredonchel E, Devos A, Ghoumid J, Mention K, Dobbelaere D, Chevalier-Curt MJ, Fontaine M, Defoort S, Smirnov V, Douillard C, Dhaenens CM. A novel HADHA variant associated with an atypical moderate and late-onset LCHAD deficiency. Mol Genet Metab Rep 2022; 31:100860. [PMID: 35782617 PMCID: PMC9248219 DOI: 10.1016/j.ymgmr.2022.100860] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Revised: 03/06/2022] [Accepted: 03/07/2022] [Indexed: 12/29/2022] Open
Abstract
Background Long chain 3-hydroxyacyl-CoA dehydrogenase deficiency (LCHADD) is a rare inherited disease caused by pathogenic variants of HADHA gene. Along with signs common to fatty acid oxidation defects (FAOD), specific retina and heart alterations are observed. Because long-chain fatty acid oxidation is selectively affected, supplementations with short/medium-chain fats represent energetic sources bypassing the enzymatic blockade. Here, we report on an atypical presentation of the disease. Methods Clinical features were described with medical explorations including ophthalmic and cardiac examination. Biological underlying defects were investigated by measurements of biochemical metabolites and by fluxomic studies of mitochondrial β-oxidation. Whole exome sequencing and molecular validation of variants confirmed the diagnosis. Results The patient has developed at nine years an unlabeled maculopathy, and at 28 years, an acute cardiac decompensation without any premise. Blood individual acylcarnitine analysis showed a rise in hydroxylated long-chain fatty acids and fluxomic studies validated enzyme blockade consistent with LCHADD. Genetic analysis revealed the common p.(Glu510Gln) variant in HADHA, in trans with a novel variant c.1108G > A, p.(Gly370Arg) located in the NAD binding domain. Patient pathology was responsive to triheptanoin supplementation. Conclusion This atypical LCHADD form report should encourage the early assessment of biochemical and genetic testing as a specific management is recommended (combination with fast avoidance, low fat-high carbohydrate diet, medium-even-chain triglycerides or triheptanoin supplementation). Mild hyperpigmented macular dots could be the first and early symptom of moderate LCHAD. The novel HADHA c.1108G > A, p.(Gly370Arg) is hypomorphic and associated with moderate LCHAD. Atypical and late LCHAD can be deciphered by joint biochemical and genetical investigations. Acylcarnitines must be tested in unexplained macular dystrophy and/or dilated cardiomyopathy. Supplementation with the triglyceride triheptanoin is effective.
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Nolan ND, Jenny LA, Wang NK, Tsang SH. Retinal pigment epithelium lipid metabolic demands and therapeutic restoration. Taiwan J Ophthalmol 2021; 11:216-220. [PMID: 34703736 PMCID: PMC8493995 DOI: 10.4103/tjo.tjo_31_21] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Accepted: 07/12/2021] [Indexed: 01/13/2023] Open
Abstract
One of the defining features of the retina is the tight metabolic coupling between cells such as photoreceptors and the retinal pigment epithelium (RPE). This necessitates the compartmentalization and proper substrate availability required for specialized processes such as photo-transduction. Glucose metabolism is preferential in many human cell types for adenosine triphosphate generation, yet fatty acid β-oxidation generates essential fuel for RPE. Here, we provide a brief overview of metabolic demands in both the healthy and dystrophic RPE with an emphasis on fatty acid oxidation. We outline therapies aimed at renormalizing this metabolism and explore future avenues for therapeutic intervention.
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Affiliation(s)
- Nicholas D Nolan
- Departments of Ophthalmology, Pathology and Cell Biology, Jonas Children's Vision Care, and Bernard and Shirlee Brown Glaucoma Laboratory, Columbia Stem Cell Initiative, Institute of Human Nutrition, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, USA.,Edward S. Harkness Eye Institute, New York-Presbyterian Hospital, New York, NY, USA
| | - Laura A Jenny
- Departments of Ophthalmology, Pathology and Cell Biology, Jonas Children's Vision Care, and Bernard and Shirlee Brown Glaucoma Laboratory, Columbia Stem Cell Initiative, Institute of Human Nutrition, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, USA.,Edward S. Harkness Eye Institute, New York-Presbyterian Hospital, New York, NY, USA
| | - Nan-Kai Wang
- Departments of Ophthalmology, Pathology and Cell Biology, Jonas Children's Vision Care, and Bernard and Shirlee Brown Glaucoma Laboratory, Columbia Stem Cell Initiative, Institute of Human Nutrition, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, USA.,Edward S. Harkness Eye Institute, New York-Presbyterian Hospital, New York, NY, USA
| | - Stephen H Tsang
- Departments of Ophthalmology, Pathology and Cell Biology, Jonas Children's Vision Care, and Bernard and Shirlee Brown Glaucoma Laboratory, Columbia Stem Cell Initiative, Institute of Human Nutrition, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, USA.,Edward S. Harkness Eye Institute, New York-Presbyterian Hospital, New York, NY, USA.,Department of Pathology and Cell Biology, Herbert Irving Comprehensive Cancer Center, Institute of Human Nutrition, Columbia University, New York, NY, USA
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10
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García García LC, Zamorano Martín F, Rocha de Lossada C, García Lorente M, Luque Aranda G, Escudero Gómez J. Retinitis pigmentosa as a clinical presentation of LCHAD deficiency: A clinical case and review of the literature. ARCHIVOS DE LA SOCIEDAD ESPAÑOLA DE OFTALMOLOGÍA 2021; 96:496-499. [PMID: 34479707 DOI: 10.1016/j.oftale.2020.07.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Accepted: 07/09/2020] [Indexed: 11/16/2022]
Abstract
Long-chain 3-hydroxyacyl-CoA dehydrogenase deficiency is a rare metabolic disease caused by a specific mutation in the HADHA gene, which leads to an alteration in the metabolic pathway of fatty acids. Its most frequent form of presentation at the ophthalmological level is retinitis pigmentosa, and in some cases the ophthalmologist could be the first one to alert the other paediatric specialties to carry out a multidisciplinary approach to the case. The case is presented of a patient with long-chain 3-hydroxyacyl-CoA dehydrogenase deficit detected in neonatal screening, and which clinically debuted as pigmentary retinosis with no alteration in visual acuity as observed in the fundus images and optical coherence tomography of the retina provided. Finally, a review of the literature of this potentially lethal pathology is presented, and the main pathological and clinical features are highlighted.
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Affiliation(s)
- L C García García
- Servicio de Oftalmología, Hospital Regional Universitario de Málaga, Málaga, Spain; Servicio de Oftalmología, Hospital Universitario de Torrevieja, Torrevieja, Alicante, Spain.
| | - F Zamorano Martín
- Servicio de Oftalmología, Hospital Regional Universitario de Málaga, Málaga, Spain
| | - C Rocha de Lossada
- Servicio de Oftalmología, Hospital Regional Universitario de Málaga, Málaga, Spain
| | - M García Lorente
- Servicio de Oftalmología, Hospital Regional Universitario de Málaga, Málaga, Spain
| | - G Luque Aranda
- Servicio de Oftalmología, Hospital Regional Universitario de Málaga, Málaga, Spain
| | - J Escudero Gómez
- Servicio de Oftalmología, Hospital Regional Universitario de Málaga, Málaga, Spain
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11
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HK2 Mediated Glycolytic Metabolism in Mouse Photoreceptors Is Not Required to Cause Late Stage Age-Related Macular Degeneration-Like Pathologies. Biomolecules 2021; 11:biom11060871. [PMID: 34208233 PMCID: PMC8230848 DOI: 10.3390/biom11060871] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 06/01/2021] [Accepted: 06/09/2021] [Indexed: 12/12/2022] Open
Abstract
Age-related macular degeneration (AMD) is a multifactorial disease of unclear etiology. We previously proposed that metabolic adaptations in photoreceptors (PRs) play a role in disease progression. We mimicked these metabolic adaptations in mouse PRs through deletion of the tuberous sclerosis complex (TSC) protein TSC1. Here, we confirm our previous findings by deletion of the other complex protein, namely TSC2, in rod photoreceptors. Similar to deletion of Tsc1, mice with deletion of Tsc2 in rods develop AMD-like pathologies, including accumulation of apolipoproteins, migration of microglia, geographic atrophy, and neovascular pathologies. Subtle differences between the two mouse models, such as a significant increase in microglia activation with loss of Tsc2, were seen as well. To investigate the role of altered glucose metabolism in disease pathogenesis, we generated mice with simulation deletions of Tsc2 and hexokinase-2 (Hk2) in rods. Although retinal lactate levels returned to normal in mice with Tsc2-Hk2 deletion, AMD-like pathologies still developed. The data suggest that the metabolic adaptations in PRs that cause AMD-like pathologies are independent of HK2-mediated aerobic glycolysis.
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12
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Fu Z, Kern TS, Hellström A, Smith LEH. Fatty acid oxidation and photoreceptor metabolic needs. J Lipid Res 2021; 62:100035. [PMID: 32094231 PMCID: PMC7905050 DOI: 10.1194/jlr.tr120000618] [Citation(s) in RCA: 50] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 02/14/2020] [Indexed: 01/31/2023] Open
Abstract
Photoreceptors have high energy demands and a high density of mitochondria that produce ATP through oxidative phosphorylation (OXPHOS) of fuel substrates. Although glucose is the major fuel for CNS brain neurons, in photoreceptors (also CNS), most glucose is not metabolized through OXPHOS but is instead metabolized into lactate by aerobic glycolysis. The major fuel sources for photoreceptor mitochondria remained unclear for almost six decades. Similar to other tissues (like heart and skeletal muscle) with high metabolic rates, photoreceptors were recently found to metabolize fatty acids (palmitate) through OXPHOS. Disruption of lipid entry into photoreceptors leads to extracellular lipid accumulation, suppressed glucose transporter expression, and a duel lipid/glucose fuel shortage. Modulation of lipid metabolism helps restore photoreceptor function. However, further elucidation of the types of lipids used as retinal energy sources, the metabolic interaction with other fuel pathways, as well as the cross-talk among retinal cells to provide energy to photoreceptors is not fully understood. In this review, we will focus on the current understanding of photoreceptor energy demand and sources, and potential future investigations of photoreceptor metabolism.
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Affiliation(s)
- Zhongjie Fu
- Department of Ophthalmology, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA; Manton Center for Orphan Disease, Boston Children's Hospital, Boston, MA, USA.
| | - Timothy S Kern
- Center for Translational Vision Research, Gavin Herbert Eye Institute, Irvine, CA, USA
| | - Ann Hellström
- Section for Ophthalmology, Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden
| | - Lois E H Smith
- Department of Ophthalmology, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA.
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13
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Rigaudière F, Delouvrier E, Le Gargasson JF, Milani P, Ogier de Baulny H, Schiff M. Long-chain 3-hydroxyacyl-CoA dehydrogenase (LCHAD) deficiency and progressive retinopathy: one case report followed by ERGs, VEPs, EOG over a 17-year period. Doc Ophthalmol 2021; 142:371-380. [PMID: 33392894 DOI: 10.1007/s10633-020-09802-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Accepted: 10/27/2020] [Indexed: 11/30/2022]
Abstract
BACKGROUND LCHAD (long-chain 3-hydroxyacyl-CoA dehydrogenase) deficiency is a rare genetic disorder of mitochondrial long-chain fatty acid oxidation inherited as a recessive trait. Affected patients can present with hypoglycaemia, rhabdomyolysis and cardiomyopathy. About half of the patients may suffer from retinopathy. CASE REPORT A 19-year-old girl was diagnosed as suffering from LCHAD deficiency with recurrent rhabdomyolysis episodes at the age of 7 months by an inaugural coma with hypoglycaemia and hepatomegaly. Appropriate dietary management with carnitine supplementation was initiated. Retinopathy was diagnosed at age two. Ophthalmological assessments including visual acuity, visual field, OCT, flash ERGs, P-ERG, flash VEPs and EOG recordings were conducted over a 17-year period. RESULTS Visual acuity was decreased. Fundi showed a progressive retinopathy and chorioretinopathy. Photophobia was noticed 2 years before the decrease in photopic-ERG amplitude with normal scotopic-ERGs. Scotopic-ERG amplitude decreased 10 years after the decrease in photopic-ERG amplitude. No EOG light rise was observed. Flash VEPs remained normal. These results suggest that the cone system dysfunction occurs largely prior to the rod system dysfunction with a relative preservation of the macula function. COMMENTS This dysfunction of cones prior to the dysfunction of rods was not reported previously. This could be related to mitochondrial energy failure in cones as cones are greater consumers of ATP than rods. This hypothesis needs to be further confirmed as other long-chain fatty oxidation defective patients (VLCAD and CPT2 deficiencies) do not exhibit retinopathy.
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Affiliation(s)
- Florence Rigaudière
- Service de Physiologie Clinique, Exploration Fonctionnelle, Hôpital Lariboisière, AP-HP, Paris, France. .,Faculté de Médecine Paris-Diderot, Université de Paris, Paris, France.
| | | | - Jean-François Le Gargasson
- Service de Physiologie Clinique, Exploration Fonctionnelle, Hôpital Lariboisière, AP-HP, Paris, France.,Faculté de Médecine Paris-Diderot, Université de Paris, Paris, France
| | - Paolo Milani
- Service de Physiologie Clinique, Exploration Fonctionnelle, Hôpital Lariboisière, AP-HP, Paris, France
| | - Hélène Ogier de Baulny
- Faculté de Médecine Paris-Diderot, Université de Paris, Paris, France.,Reference Center for Inborn Errors of Metabolism, Robert Debré Hospital, AP-HP, Paris, France
| | - Manuel Schiff
- Reference Center for Inborn Errors of Metabolism, Robert Debré Hospital, AP-HP, Paris, France.,Reference Center for Inborn Errors of Metabolism, Faculté de Médecine Paris-Descartes, Necker University Hospital, AP-HP, Université de Paris, Paris, France.,Institut Imagine, Inserm UMRS_1163, Paris, France
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14
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Bhatwadekar AD, Rameswara V. Circadian rhythms in diabetic retinopathy: an overview of pathogenesis and investigational drugs. Expert Opin Investig Drugs 2020; 29:1431-1442. [PMID: 33107770 DOI: 10.1080/13543784.2020.1842872] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
INTRODUCTION Circadian rhythm is a natural endogenous process occurring roughly every 24 hours. Circadian rhythm dysfunction is involved in diabetic retinopathy (DR) pathogenesis. Interestingly, there are investigational drugs that exhibit potential in the treatment of DR by targeting circadian rhythm dysfunction. AREAS COVERED We performed a literature search in June 2020 using PubMed's Medical Subject Heading (MeSH) terms 'circadian clock,' 'circadian rhythms,' and 'diabetic retinopathy.' This article offers an overview of the physiology of the biological clock and clock regulatory genes and presents an examination of the retinal clock. It discusses the pathogenic mechanisms of DR and emphasizes how circadian rhythm dysfunction at structural, physiological, metabolic and cellular levels, plays a critical role in the development of DR. The latter part of the paper sheds light on those investigational drugs (such as melatonin, tasimelteon and metformin) which exhibit potential in the treatment of DR by the targeting of circadian rhythm dysfunction. EXPERT OPINION An enhanced understanding of circadian rhythm and its role in DR could offer therapeutic potential by targeting of circadian rhythm dysfunction.
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Affiliation(s)
- Ashay D Bhatwadekar
- Department of Ophthalmology, Eugene and Marilyn Glick Eye Institute , Indianapolis, IN, USA
| | - Varun Rameswara
- Indiana University School of Medicine. Indiana University , Indianapolis, IN, USA
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15
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Louer EMM, Yi G, Carmone C, Robben J, Stunnenberg HG, den Hollander AI, Deen PMT. Genes Involved in Energy Metabolism Are Differentially Expressed During the Day-Night Cycle in Murine Retinal Pigment Epithelium. Invest Ophthalmol Vis Sci 2020; 61:49. [PMID: 32460311 PMCID: PMC7405837 DOI: 10.1167/iovs.61.5.49] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Purpose The functional interaction between photoreceptors and retinal pigment epithelium (RPE) cells is essential for vision. Phagocytosis of photoreceptor outer segments (POSs) by the RPE follows a circadian pattern; however, it remains unknown whether other RPE processes follow a daily rhythm. Therefore, our aim was to identify RPE processes following a daily rhythm. Methods Murine RPE was isolated at Zeitgeber time (ZT) 0, 2, 4, 9, 14, and 19 (n = 5 per time point), after which RNA was isolated and sequenced. Genes with a significant difference in expression between time points (P < 0.05) were subjected to EnrichR pathway analysis to identify daily rhythmic processes. Results Pathway enrichment revealed 13 significantly enriched KEGG pathways (P < 0.01), including the metabolic pathway (P = 0.002821). Analysis of the metabolic pathway differentially expressed genes revealed that genes involved in adenosine triphosphate production, glycolysis, glycogenolysis, and glycerophospholipid were low at ZT0 (light onset) and high at ZT19 (night). Genes involved in fatty acid degradation and cholesterol synthesis were high at light onset and low at night. Conclusions Our transcriptome data suggest that the highest energy demand of RPE cells is at night, whereas POS phagocytosis and degradation take place in the morning. Furthermore, we identified genes involved in fatty acid and glycerophospholipid synthesis that are upregulated at night, possibly playing a role in generating building blocks for membrane synthesis.
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16
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García García LC, Zamorano Martín F, Rocha de Lossada C, García Lorente M, Luque Aranda G, Escudero Gómez J. Retinitis pigmentosa as a clinical presentation of LCHAD deficiency: A clinical case and review of the literature. ACTA ACUST UNITED AC 2020. [PMID: 32943256 DOI: 10.1016/j.oftal.2020.07.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Long-chain 3-hydroxyacyl-CoA dehydrogenase deficiency is a rare metabolic disease caused by a specific mutation in the HADHA gene, which leads to an alteration in the metabolic pathway of fatty acids. Its most frequent form of presentation at the ophthalmological level is retinitis pigmentosa, and in some cases the ophthalmologist could be the first one to alert the other paediatric specialties to carry out a multidisciplinary approach to the case. The case is presented of a patient with long-chain 3-hydroxyacyl-CoA dehydrogenase deficit detected in neonatal screening, and which clinically debuted as pigmentary retinosis with no alteration in visual acuity as observed in the fundus images and optical coherence tomography of the retina provided. Finally, a review of the literature of this potentially lethal pathology is presented, and the main pathological and clinical features are highlighted.
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Affiliation(s)
- L C García García
- Servicio de Oftalmología, Hospital Regional Universitario de Málaga, Málaga, España; Servicio de Oftalmología, Hospital Universitario de Torrevieja, Torrevieja, Alicante, España.
| | - F Zamorano Martín
- Servicio de Oftalmología, Hospital Regional Universitario de Málaga, Málaga, España
| | - C Rocha de Lossada
- Servicio de Oftalmología, Hospital Regional Universitario de Málaga, Málaga, España
| | - M García Lorente
- Servicio de Oftalmología, Hospital Regional Universitario de Málaga, Málaga, España
| | - G Luque Aranda
- Servicio de Oftalmología, Hospital Regional Universitario de Málaga, Málaga, España
| | - J Escudero Gómez
- Servicio de Oftalmología, Hospital Regional Universitario de Málaga, Málaga, España
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17
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Sinha T, Naash MI, Al-Ubaidi MR. Flavins Act as a Critical Liaison Between Metabolic Homeostasis and Oxidative Stress in the Retina. Front Cell Dev Biol 2020; 8:861. [PMID: 32984341 PMCID: PMC7481326 DOI: 10.3389/fcell.2020.00861] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Accepted: 08/10/2020] [Indexed: 12/14/2022] Open
Abstract
Derivatives of the vitamin riboflavin, FAD and FMN, are essential cofactors in a multitude of bio-energetic reactions, indispensable for lipid metabolism and also are requisites in mitigating oxidative stress. Given that a balance between all these processes contributes to the maintenance of retinal homeostasis, effective regulation of riboflavin levels in the retina is paramount. However, various genetic and dietary factors have brought to fore pathological conditions that co-occur with a suboptimal level of flavins in the retina. Our focus in this review is to, comprehensively summarize all the possible metabolic and oxidative reactions which have been implicated in various retinal pathologies and to highlight the contribution flavins may have played in these. Recent research has found a sensitive method of measuring flavins in both diseased and healthy retina, presence of a novel flavin binding protein exclusively expressed in the retina, and the presence of flavin specific transporters in both the inner and outer blood-retina barriers. In light of these exciting findings, it is even more imperative to shift our focus on how the retina regulates its flavin homeostasis and what happens when this is disrupted.
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Affiliation(s)
- Tirthankar Sinha
- Department of Biomedical Engineering, University of Houston, Houston, TX, United States
| | - Muna I Naash
- Department of Biomedical Engineering, University of Houston, Houston, TX, United States
| | - Muayyad R Al-Ubaidi
- Department of Biomedical Engineering, University of Houston, Houston, TX, United States
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18
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Natarajan SK, Ibdah JA. Role of 3-Hydroxy Fatty Acid-Induced Hepatic Lipotoxicity in Acute Fatty Liver of Pregnancy. Int J Mol Sci 2018; 19:ijms19010322. [PMID: 29361796 PMCID: PMC5796265 DOI: 10.3390/ijms19010322] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2018] [Revised: 01/16/2018] [Accepted: 01/16/2018] [Indexed: 12/16/2022] Open
Abstract
Acute fatty liver of pregnancy (AFLP), a catastrophic illness for both the mother and the unborn offspring, develops in the last trimester of pregnancy with significant maternal and perinatal mortality. AFLP is also recognized as an obstetric and medical emergency. Maternal AFLP is highly associated with a fetal homozygous mutation (1528G>C) in the gene that encodes for mitochondrial long-chain hydroxy acyl-CoA dehydrogenase (LCHAD). The mutation in LCHAD results in the accumulation of 3-hydroxy fatty acids, such as 3-hydroxy myristic acid, 3-hydroxy palmitic acid and 3-hydroxy dicarboxylic acid in the placenta, which are then shunted to the maternal circulation leading to the development of acute liver injury observed in patients with AFLP. In this review, we will discuss the mechanistic role of increased 3-hydroxy fatty acid in causing lipotoxicity to the liver and in inducing oxidative stress, mitochondrial dysfunction and hepatocyte lipoapoptosis. Further, we also review the role of 3-hydroxy fatty acids in causing placental damage, pancreatic islet β-cell glucolipotoxicity, brain damage, and retinal epithelial cells lipoapoptosis in patients with LCHAD deficiency.
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Affiliation(s)
- Sathish Kumar Natarajan
- Department of Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, NE 68583-0806, USA.
| | - Jamal A Ibdah
- Division of Gastroenterology and Hepatology, University of Missouri, Columbia, MO 65212, USA.
- Department of Medical Pharmacology and Physiology, University of Missouri, Columbia, MO 65212, USA.
- Harry S. Truman Memorial Veterans Medical Center, Columbia, MO 65201, USA.
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19
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Sturm V. Ophthalmologic Abnormalities in Long-Chain 3-Hydroxyacyl-Coa Dehydrogenase Deficiency: Presentation of a Long-Term Survivor. Eur J Ophthalmol 2018; 18:476-8. [DOI: 10.1177/112067210801800330] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- V. Sturm
- Department of Ophthalmology, University Hospital of Zurich, Zurich - Switzerland
- Department of Ophthalmology, University Hospital of Hamburg, Hamburg - Germany
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20
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Sas KM, Lin J, Rajendiran TM, Soni T, Nair V, Hinder LM, Jagadish HV, Gardner TW, Abcouwer SF, Brosius FC, Feldman EL, Kretzler M, Michailidis G, Pennathur S. Shared and distinct lipid-lipid interactions in plasma and affected tissues in a diabetic mouse model. J Lipid Res 2017; 59:173-183. [PMID: 29237716 DOI: 10.1194/jlr.m077222] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 12/12/2017] [Indexed: 01/17/2023] Open
Abstract
Lipids are ubiquitous metabolites with diverse functions; abnormalities in lipid metabolism appear to be related to complications from multiple diseases, including type 2 diabetes. Through technological advances, the entire lipidome has been characterized and researchers now need computational approaches to better understand lipid network perturbations in different diseases. Using a mouse model of type 2 diabetes with microvascular complications, we examined lipid levels in plasma and in renal, neural, and retinal tissues to identify shared and distinct lipid abnormalities. We used correlation analysis to construct interaction networks in each tissue, to associate changes in lipids with changes in enzymes of lipid metabolism, and to identify overlap of coregulated lipid subclasses between plasma and each tissue to define subclasses of plasma lipids to use as surrogates of tissue lipid metabolism. Lipid metabolism alterations were mostly tissue specific in the kidney, nerve, and retina; no lipid changes correlated between the plasma and all three tissue types. However, alterations in diacylglycerol and in lipids containing arachidonic acid, an inflammatory mediator, were shared among the tissue types, and the highly saturated cholesterol esters were similarly coregulated between plasma and each tissue type in the diabetic mouse. Our results identified several patterns of altered lipid metabolism that may help to identify pathogenic alterations in different tissues and could be used as biomarkers in future research into diabetic microvascular tissue damage.
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Affiliation(s)
- Kelli M Sas
- Division of Nephrology, Departments of Internal Medicine, University of Michigan, Ann Arbor, MI 48109
| | - Jiahe Lin
- Departments of Statistics, University of Michigan, Ann Arbor, MI 48109
| | - Thekkelnaycke M Rajendiran
- Departments of Pathology, University of Michigan, Ann Arbor, MI 48109.,Michigan Regional Comprehensive Metabolomics Resource Core Ann Arbor, MI 48105
| | - Tanu Soni
- Michigan Regional Comprehensive Metabolomics Resource Core Ann Arbor, MI 48105
| | - Viji Nair
- Division of Nephrology, Departments of Internal Medicine, University of Michigan, Ann Arbor, MI 48109.,Departments of Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI 48109
| | - Lucy M Hinder
- Departments of Neurology, University of Michigan, Ann Arbor, MI 48109
| | - Hosagrahar V Jagadish
- Departments of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI 48109
| | - Thomas W Gardner
- Departments of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, MI 48109.,Departments of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI 48109
| | - Steven F Abcouwer
- Departments of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, MI 48109
| | - Frank C Brosius
- Division of Nephrology, Departments of Internal Medicine, University of Michigan, Ann Arbor, MI 48109.,Departments of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI 48109
| | - Eva L Feldman
- Departments of Neurology, University of Michigan, Ann Arbor, MI 48109
| | - Matthias Kretzler
- Division of Nephrology, Departments of Internal Medicine, University of Michigan, Ann Arbor, MI 48109.,Departments of Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI 48109
| | - George Michailidis
- Department of Statistics and Computer and Information Sciences, University of Florida, Gainesville, FL 32611
| | - Subramaniam Pennathur
- Division of Nephrology, Departments of Internal Medicine, University of Michigan, Ann Arbor, MI 48109 .,Michigan Regional Comprehensive Metabolomics Resource Core Ann Arbor, MI 48105.,Departments of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI 48109
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21
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Joyal JS, Gantner ML, Smith LEH. Retinal energy demands control vascular supply of the retina in development and disease: The role of neuronal lipid and glucose metabolism. Prog Retin Eye Res 2017; 64:131-156. [PMID: 29175509 DOI: 10.1016/j.preteyeres.2017.11.002] [Citation(s) in RCA: 102] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Revised: 11/11/2017] [Accepted: 11/15/2017] [Indexed: 12/15/2022]
Affiliation(s)
- Jean-Sébastien Joyal
- Department of Pediatrics, Pharmacology and Ophthalmology, CHU Sainte-Justine Research Center, Université de Montréal, Montreal, Qc, Canada; Department of Pharmacology and Therapeutics, McGill University, Montreal, Qc, Canada.
| | - Marin L Gantner
- The Lowy Medical Research Institute, La Jolla, United States
| | - Lois E H Smith
- Department of Ophthalmology, Harvard Medical School, Boston Children's Hospital, 300 Longwood Avenue, Boston MA 02115, United States.
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22
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Reyes-Reveles J, Dhingra A, Alexander D, Bragin A, Philp NJ, Boesze-Battaglia K. Phagocytosis-dependent ketogenesis in retinal pigment epithelium. J Biol Chem 2017; 292:8038-8047. [PMID: 28302729 DOI: 10.1074/jbc.m116.770784] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Revised: 03/13/2017] [Indexed: 11/06/2022] Open
Abstract
Daily, the retinal pigment epithelium (RPE) ingests a bolus of lipid and protein in the form of phagocytized photoreceptor outer segments (OS). The RPE, like the liver, expresses enzymes required for fatty acid oxidation and ketogenesis. This suggests that these pathways play a role in the disposal of lipids from ingested OS, as well as providing a mechanism for recycling metabolic intermediates back to the outer retina. In this study, we examined whether OS phagocytosis was linked to ketogenesis. We found increased levels of β-hydroxybutyrate (β-HB) in the apical medium following ingestion of OS by human fetal RPE and ARPE19 cells cultured on Transwell inserts. No increase in ketogenesis was observed following ingestion of oxidized OS or latex beads. Our studies further defined the connection between OS phagocytosis and ketogenesis in wild-type mice and mice with defects in phagosome maturation using a mouse RPE explant model. In explant studies, the levels of β-HB released were temporally correlated with OS phagocytic burst after light onset. In the Mreg-/- mouse where phagosome maturation is delayed, there was a temporal shift in the release of β-HB. An even more pronounced shift in maximal β-HB production was observed in the Abca4-/- RPE, in which loss of the ATP-binding cassette A4 transporter results in defective phagosome processing and accumulation of lipid debris. These studies suggest that FAO and ketogenesis are key to supporting the metabolism of the RPE and preventing the accumulation of lipids that lead to oxidative stress and mitochondrial dysfunction.
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Affiliation(s)
- Juan Reyes-Reveles
- From the Department of Biochemistry, School of Dental Medicine (SDM), University of Pennsylvania, Philadelphia, Pennsylvania 19104 and
| | - Anuradha Dhingra
- From the Department of Biochemistry, School of Dental Medicine (SDM), University of Pennsylvania, Philadelphia, Pennsylvania 19104 and
| | - Desiree Alexander
- From the Department of Biochemistry, School of Dental Medicine (SDM), University of Pennsylvania, Philadelphia, Pennsylvania 19104 and
| | - Alvina Bragin
- From the Department of Biochemistry, School of Dental Medicine (SDM), University of Pennsylvania, Philadelphia, Pennsylvania 19104 and
| | - Nancy J Philp
- the Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, Pennsylvania 19146
| | - Kathleen Boesze-Battaglia
- From the Department of Biochemistry, School of Dental Medicine (SDM), University of Pennsylvania, Philadelphia, Pennsylvania 19104 and
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23
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Andersson Grönlund M, Andersson S, Åkebrand R, Seyedi Honarvar AK, Sofou K, Darin N, Tulinius M. Ophthalmologic involvement in Leigh syndrome. Acta Ophthalmol 2017; 95:e76. [PMID: 27234010 DOI: 10.1111/aos.13124] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Marita Andersson Grönlund
- Department of Pediatric Ophthalmology; The Queen Silvia Children's Hospital, Sahlgrenska University Hospital Sweden
| | - Susann Andersson
- Department of Pediatric Ophthalmology; The Queen Silvia Children's Hospital, Sahlgrenska University Hospital Sweden
| | - Rebecka Åkebrand
- Department of Pediatric Ophthalmology; The Queen Silvia Children's Hospital, Sahlgrenska University Hospital Sweden
| | - Antovan K. Seyedi Honarvar
- Department of Pediatric Ophthalmology; The Queen Silvia Children's Hospital, Sahlgrenska University Hospital Sweden
| | - Kalliopi Sofou
- Department of Pediatrics; The Queen Silvia Children's Hospital; Sahlgrenska University Hospital; Gothenburg Sweden
| | - Niklas Darin
- Department of Pediatrics; The Queen Silvia Children's Hospital; Sahlgrenska University Hospital; Gothenburg Sweden
| | - Mar Tulinius
- Department of Pediatrics; The Queen Silvia Children's Hospital; Sahlgrenska University Hospital; Gothenburg Sweden
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24
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Vancura P, Wolloscheck T, Baba K, Tosini G, Iuvone PM, Spessert R. Circadian and Dopaminergic Regulation of Fatty Acid Oxidation Pathway Genes in Retina and Photoreceptor Cells. PLoS One 2016; 11:e0164665. [PMID: 27727308 PMCID: PMC5058478 DOI: 10.1371/journal.pone.0164665] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Accepted: 09/28/2016] [Indexed: 12/17/2022] Open
Abstract
The energy metabolism of the retina might comply with daily changes in energy demand and is impaired in diabetic retinopathy-one of the most common causes of blindness in Europe and the USA. The aim of this study was to investigate putative adaptation of energy metabolism in healthy and diabetic retina. Hence expression analysis of metabolic pathway genes was performed using quantitative polymerase chain reaction, semi-quantitative western blot and immunohistochemistry. Transcriptional profiling of key enzymes of energy metabolism identified transcripts of mitochondrial fatty acid β-oxidation enzymes, i.e. carnitine palmitoyltransferase-1α (Cpt-1α) and medium chain acyl-CoA dehydrogenase (Acadm) to display daily rhythms with peak values during daytime in preparations of the whole retina and microdissected photoreceptors. The cycling of both enzymes persisted in constant darkness, was dampened in mice deficient for dopamine D4 (D4) receptors and was altered in db/db mice-a model of diabetic retinopathy. The data of the present study are consistent with circadian clock-dependent and dopaminergic regulation of fatty acid oxidation in retina and its putative disturbance in diabetic retina.
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MESH Headings
- Acyl-CoA Dehydrogenase/genetics
- Acyl-CoA Dehydrogenase/metabolism
- Animals
- Carnitine O-Palmitoyltransferase/genetics
- Carnitine O-Palmitoyltransferase/metabolism
- Circadian Rhythm/physiology
- Diabetic Retinopathy/metabolism
- Diabetic Retinopathy/pathology
- Disease Models, Animal
- Dopamine/metabolism
- Energy Metabolism
- Fatty Acids/chemistry
- Fatty Acids/metabolism
- Female
- Male
- Mice
- Mice, Inbred C3H
- Mice, Inbred C57BL
- Mice, Knockout
- Mice, Obese
- Microscopy, Fluorescence
- Oxidation-Reduction
- Photoreceptor Cells/metabolism
- Receptor, Melatonin, MT1/deficiency
- Receptor, Melatonin, MT1/genetics
- Receptors, Dopamine D4/deficiency
- Receptors, Dopamine D4/genetics
- Retina/metabolism
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Affiliation(s)
- Patrick Vancura
- Institute of Functional and Clinical Anatomy, University Medical Center of the Johannes Gutenberg University, Mainz, Germany
| | - Tanja Wolloscheck
- Institute of Functional and Clinical Anatomy, University Medical Center of the Johannes Gutenberg University, Mainz, Germany
| | - Kenkichi Baba
- Neuroscience Institute and Department of Pharmacology and Toxicology, Morehouse School of Medicine, Atlanta, Georgia, United States of America
| | - Gianluca Tosini
- Neuroscience Institute and Department of Pharmacology and Toxicology, Morehouse School of Medicine, Atlanta, Georgia, United States of America
| | - P. Michael Iuvone
- Department of Ophthalmology, Emory University School of Medicine, Atlanta, Georgia, United States of America
| | - Rainer Spessert
- Institute of Functional and Clinical Anatomy, University Medical Center of the Johannes Gutenberg University, Mainz, Germany
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MULTIMODAL IMAGING AND ELECTRORETINOGRAPHY IN LONG-CHAIN 3-HYDROXYACYL COENZYME A DEHYDROGENASE DEFICIENCY. Retin Cases Brief Rep 2016; 11 Suppl 1:S107-S112. [PMID: 27652820 DOI: 10.1097/icb.0000000000000428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE To report a case of pigmentary retinopathy in long-chain 3-hydroxyacyl coenzyme A dehydrogenase deficiency using multimodal imaging techniques. METHODS Case report. RESULTS An 8-year-old boy with a history of failure to thrive and a diagnosis of long-chain 3-hydroxyacyl coenzyme A dehydrogenase deficiency was referred for examination. Examination revealed a pigmentary retinopathy with macular atrophy; electroretinography results were consistent with a rod-cone dystrophy. Fundus autofluorescence and optical coherence tomography revealed retinal pigment epithelium atrophy. Follow-up examination findings showed increased severity of retinopathy on electroretinography, with optical coherence tomography angiography revealing enhanced visualization of choroidal vessels. CONCLUSION This report reveals that long-chain 3-hydroxyacyl coenzyme A dehydrogenase deficiency can be characterized as a progressive rod-cone dystrophy, with multi-modal imaging techniques used to describe this condition. In particular, optical coherence tomography angiography can be used to further characterize this condition.
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Abstract
The molecular basis of migraine is still not completely understood. An impairment of mitochondrial oxidative metabolism might play a role in the pathophysiology of this disease, by influencing neuronal information processing. Biochemical assays of platelets and muscle biopsies performed in migraine sufferers have shown a decreased activity of the respiratory chain enzymes. Studies with phosphorus magnetic resonance spectroscopy (31P-MRS) have demonstrated an impairment of the brain oxidative energy metabolism both during and between migraine attacks. However, molecular genetic studies have not detected specific mitochondrial DNA (mtDNA) mutations in patients with migraine, although other studies suggest that particular genetic markers (i.e. neutral polymorphisms or secondary mtDNA mutations) might be present in some migraine sufferers. Further studies are still needed to clarify if migraine is associated with unidentified mutations on the mtDNA or on nuclear genes that code mitochondrial proteins. In this paper, we review morphological, biochemical, imaging and genetic studies which bear on the hypothesis that migraine may be related to mitochondrial dysfunction at least in some individuals.
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Affiliation(s)
- M Sparaco
- Department of Neurology and Headache Centre, Hospital G. Rummo Benevento, Benevento, Italy.
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27
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Llorca-Cardeñosa A, Català-Mora J, García-Cazorla A, Meavilla S, Castejón-Ponce E. Long-chain 3-hydroxyacyl-CoA dehydrogenase deficiency: A case report. ARCHIVOS DE LA SOCIEDAD ESPANOLA DE OFTALMOLOGIA 2016; 91:236-239. [PMID: 26896063 DOI: 10.1016/j.oftal.2016.01.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Revised: 12/31/2015] [Accepted: 01/04/2016] [Indexed: 06/05/2023]
Abstract
CLINICAL CASE A five-year-old patient, with a diagnosis of long-chain 3-hydroxyacyl-CoA dehydrogenase deficiency, was referred for an ophthalmological examination. He had a history of acute metabolic crises precipitated by intercurrent infections,as well as rhabdomyolysis. The fundoscopic examination revealed a peripapillary chorioretinal atrophy and a diffuse granular appearance of the macular retinal pigment epithelium. Best corrected visual acuity was 6/6 in both eyes, and he had a normal electroretinography test. DISCUSSION We perform a review of the literature and recent findings in relation to this disease through the description of a clinical case in order to improve the knowledge of this uncommon disorder.
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Affiliation(s)
- A Llorca-Cardeñosa
- Máster en Oftalmología Pediátrica, Hospital Sant Joan de Déu, Esplugues de Llobregat, Barcelona, España.
| | - J Català-Mora
- Sección de Retina y Vítreo, Departamento de Oftalmología Pediátrica, Hospital Sant Joan de Déu, Esplugues de Llobregat, Barcelona, España
| | - A García-Cazorla
- Departamento de Neuropediatría, Unidad de Enfermedades Metabólicas, Hospital Sant Joan de Déu, Esplugues de Llobregat, Barcelona, España
| | - S Meavilla
- Sección de Gastroenterología, Hepatología y Nutrición Infantil, Hospital Sant Joan de Déu, Esplugues de Llobregat, Barcelona, España
| | - E Castejón-Ponce
- Sección de Gastroenterología, Hepatología y Nutrición Infantil, Hospital Sant Joan de Déu, Esplugues de Llobregat, Barcelona, España
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28
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Joyal JS, Sun Y, Gantner ML, Shao Z, Evans LP, Saba N, Fredrick T, Burnim S, Kim JS, Patel G, Juan AM, Hurst CG, Hatton CJ, Cui Z, Pierce KA, Bherer P, Aguilar E, Powner MB, Vevis K, Boisvert M, Fu Z, Levy E, Fruttiger M, Packard A, Rezende FA, Maranda B, Sapieha P, Chen J, Friedlander M, Clish CB, Smith LE. Retinal lipid and glucose metabolism dictates angiogenesis through the lipid sensor Ffar1. Nat Med 2016; 22:439-45. [PMID: 26974308 PMCID: PMC4823176 DOI: 10.1038/nm.4059] [Citation(s) in RCA: 177] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2015] [Accepted: 02/05/2016] [Indexed: 02/06/2023]
Abstract
Tissues with high metabolic rates often use lipids, as well as glucose, for energy, conferring a survival advantage during feast and famine. Current dogma suggests that high-energy-consuming photoreceptors depend on glucose. Here we show that the retina also uses fatty acid β-oxidation for energy. Moreover, we identify a lipid sensor, free fatty acid receptor 1 (Ffar1), that curbs glucose uptake when fatty acids are available. Very-low-density lipoprotein receptor (Vldlr), which is present in photoreceptors and is expressed in other tissues with a high metabolic rate, facilitates the uptake of triglyceride-derived fatty acid. In the retinas of Vldlr(-/-) mice with low fatty acid uptake but high circulating lipid levels, we found that Ffar1 suppresses expression of the glucose transporter Glut1. Impaired glucose entry into photoreceptors results in a dual (lipid and glucose) fuel shortage and a reduction in the levels of the Krebs cycle intermediate α-ketoglutarate (α-KG). Low α-KG levels promotes stabilization of hypoxia-induced factor 1a (Hif1a) and secretion of vascular endothelial growth factor A (Vegfa) by starved Vldlr(-/-) photoreceptors, leading to neovascularization. The aberrant vessels in the Vldlr(-/-) retinas, which invade normally avascular photoreceptors, are reminiscent of the vascular defects in retinal angiomatous proliferation, a subset of neovascular age-related macular degeneration (AMD), which is associated with high vitreous VEGFA levels in humans. Dysregulated lipid and glucose photoreceptor energy metabolism may therefore be a driving force in macular telangiectasia, neovascular AMD and other retinal diseases.
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Affiliation(s)
- Jean-Sébastien Joyal
- Department of Pediatrics, CHU Sainte-Justine Research Center, Université de Montréal, Montreal, Qc, Ca
- Department of Pharmacology, CHU Sainte-Justine Research Center, Université de Montréal, Montreal, Qc, Ca
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Qc, Ca
| | - Ye Sun
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Qc, Ca
| | | | - Zhuo Shao
- Department of Ophthalmology, Harvard Medical School, Boston Children's Hospital, MA, USA
| | - Lucy P. Evans
- Department of Ophthalmology, Harvard Medical School, Boston Children's Hospital, MA, USA
| | - Nicholas Saba
- Department of Ophthalmology, Harvard Medical School, Boston Children's Hospital, MA, USA
| | - Thomas Fredrick
- Department of Ophthalmology, Harvard Medical School, Boston Children's Hospital, MA, USA
| | - Samuel Burnim
- Department of Ophthalmology, Harvard Medical School, Boston Children's Hospital, MA, USA
| | - Jin Sung Kim
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Qc, Ca
| | - Gauri Patel
- Department of Pharmacology, CHU Sainte-Justine Research Center, Université de Montréal, Montreal, Qc, Ca
| | - Aimee M. Juan
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Qc, Ca
| | - Christian G. Hurst
- Department of Ophthalmology, Harvard Medical School, Boston Children's Hospital, MA, USA
| | - Colman J. Hatton
- Department of Ophthalmology, Harvard Medical School, Boston Children's Hospital, MA, USA
| | - Zhenghao Cui
- Department of Ophthalmology, Harvard Medical School, Boston Children's Hospital, MA, USA
| | - Kerry A. Pierce
- Metabolite Profiling Platform, The Broad Institute of MIT and Harvard University, Cambridge, MA, USA
| | - Patrick Bherer
- Department of Genetics, Université de Sherbrooke, Sherbrooke, Qc, Ca
| | - Edith Aguilar
- Department of Cell and Molecular Biology, The Scripps Research Institute, La Jolla, CA, USA
| | | | - Kristis Vevis
- Institute of Ophthalmology, University College London, London, UK
| | - Michel Boisvert
- Department of Nutrition, CHU Sainte-Justine Research Center, Université de Montreal, Montreal, Qc, Ca
| | - Zhongjie Fu
- Department of Ophthalmology, Harvard Medical School, Boston Children's Hospital, MA, USA
| | - Emile Levy
- Department of Nutrition, CHU Sainte-Justine Research Center, Université de Montreal, Montreal, Qc, Ca
| | - Marcus Fruttiger
- Institute of Ophthalmology, University College London, London, UK
| | - Alan Packard
- Radiology, Harvard Medical School, Boston Children's Hospital, MA. USA
| | - Flavio A. Rezende
- Department of Ophthalmology, Maisonneuve-Rosemont Hospital Research Centre, Université de Montréal, Montreal, Qc, Ca
| | - Bruno Maranda
- Department of Genetics, Université de Sherbrooke, Sherbrooke, Qc, Ca
| | - Przemyslaw Sapieha
- Department of Ophthalmology, Maisonneuve-Rosemont Hospital Research Centre, Université de Montréal, Montreal, Qc, Ca
| | - Jing Chen
- Department of Ophthalmology, Harvard Medical School, Boston Children's Hospital, MA, USA
| | - Martin Friedlander
- Department of Cell and Molecular Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Clary B. Clish
- Metabolite Profiling Platform, The Broad Institute of MIT and Harvard University, Cambridge, MA, USA
| | - Lois E.H. Smith
- Department of Ophthalmology, Harvard Medical School, Boston Children's Hospital, MA, USA
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Finsterer J, Zarrouk-Mahjoub S, Daruich A. The Eye on Mitochondrial Disorders. J Child Neurol 2016; 31:652-62. [PMID: 26275973 DOI: 10.1177/0883073815599263] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2015] [Accepted: 07/08/2015] [Indexed: 11/16/2022]
Abstract
Ophthalmologic manifestations of mitochondrial disorders are frequently neglected or overlooked because they are often not regarded as part of the phenotype. This review aims at summarizing and discussing the etiology, pathogenesis, diagnosis, and treatment of ophthalmologic manifestations of mitochondrial disorders. Review of publications about ophthalmologic involvement in mitochondrial disorders by search of Medline applying appropriate search terms. The eye is frequently affected by syndromic as well as nonsyndromic mitochondrial disorders. Primary and secondary ophthalmologic manifestations can be differentiated. The most frequent ophthalmologic manifestations of mitochondrial disorders include ptosis, progressive external ophthalmoplegia, optic atrophy, retinopathy, and cataract. More rarely occurring are nystagmus and abnormalities of the cornea, ciliary body, intraocular pressure, the choroidea, or the brain secondarily affecting the eyes. It is important to recognize and diagnose ophthalmologic manifestations of mitochondrial disorders as early as possible because most are accessible to symptomatic treatment with partial or complete short-term or long-term beneficial effect. Ophthalmologic manifestations of mitochondrial disorders need to be appropriately diagnosed to initiate the most effective management and guarantee optimal outcome.
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Affiliation(s)
| | | | - Alejandra Daruich
- Department of Ophthalmology, University of Lausanne, Jules-Gonin Eye Hospital, Switzerland
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30
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Adijanto J, Du J, Moffat C, Seifert EL, Hurle JB, Philp NJ. The retinal pigment epithelium utilizes fatty acids for ketogenesis. J Biol Chem 2015; 289:20570-82. [PMID: 24898254 DOI: 10.1074/jbc.m114.565457] [Citation(s) in RCA: 119] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Every day, shortly after light onset, photoreceptor cells shed approximately a tenth of their outer segment. The adjacent retinal pigment epithelial (RPE) cells phagocytize and digest shed photoreceptor outer segment, which provides a rich source of fatty acids that could be utilized as an energy substrate. From a microarray analysis, we found that RPE cells express particularly high levels of the mitochondrial HMG-CoA synthase 2 (Hmgcs2) compared with all other tissues (except the liver and colon), leading to the hypothesis that RPE cells, like hepatocytes, can produce β-hydroxybutyrate (β-HB) from fatty acids. Using primary human fetal RPE (hfRPE) cells cultured on Transwell filters with separate apical and basal chambers, we demonstrate that hfRPE cells can metabolize palmitate, a saturated fatty acid that constitutes .15% of all lipids in the photoreceptor outer segment, to produce β-HB. Importantly, we found that hfRPE cells preferentially release β-HB into the apical chamber and that this process is mediated primarily by monocarboxylate transporter isoform 1 (MCT1). Using a GC-MS analysis of (13)C-labeled metabolites, we showed that retinal cells can take up and metabolize (13)C-labeled β-HB into various TCA cycle intermediates and amino acids. Collectively, our data support a novel mechanism of RPE-retina metabolic coupling in which RPE cells metabolize fatty acids to produce β-HB, which is transported to the retina for use as a metabolic substrate.
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31
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Effective melanin depigmentation of human and murine ocular tissues: an improved method for paraffin and frozen sections. PLoS One 2014; 9:e102512. [PMID: 25025426 PMCID: PMC4099143 DOI: 10.1371/journal.pone.0102512] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2014] [Accepted: 06/20/2014] [Indexed: 11/19/2022] Open
Abstract
Purpose The removal of excessive melanin pigments that obscure ocular tissue morphology is important to address scientific questions and for differential diagnosis of ocular tumours based on histology. Thus, the goal of the present study was to establish an effective and fast melanin bleaching method for paraffin and frozen mouse and human ocular tissues. Methods Paraffin-embedded and frozen ocular specimens from mice and human donors were subjected to bleaching employing two methods. The first employed potassium permanganate (KMnO4) with oxalic acid, and the second 10% hydrogen peroxide (H2O2). To determine optimal bleaching conditions, depigmentation was carried out at various incubation times. The effect of diluents used for 10% H2O2 was assessed using phosphate-buffered saline (PBS), and deionized water. Three different slide types and two fixatives, which were ice-cold acetone with 80% methanol, and 4% paraformaldehyde (PFA) were used to determine the optimal conditions for better tissue adherence during bleaching. All tissues were stained in hematoxylin and eosin for histological evaluation. Results Optimal bleaching was achieved using warm 10% H2O2 diluted in PBS at 65°C for 120 minutes. Chromium-gelatin-coated slides prevented tissue detachment. Adherence of cryosections was also improved with post-fixation using 4% PFA and overnight air-drying at RT after cryosectioning. Tissue morphology was preserved under these conditions. Conversely, tissues bleached in KMnO4/oxalic acid demonstrated poor depigmentation with extensive tissue damage. Conclusions Warm dilute H2O2 at 65°C for 120 minutes rapidly and effectively bleached both cryo- and paraffin sections of murine and human ocular tissues.
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Abstract
Recognition of fatty acid oxidation (FAO) disorders is important for the pediatric neurologist as they present with a spectrum of clinical disorders, including progressive lipid storage myopathy, recurrent myoglobinuria, neuropathy, progressive cardiomyopathy, recurrent hypoglycemic hypoketotic encephalopathy or Reye-like syndrome, seizures, and mental retardation. They constitute a critical group of diseases because they are potentially rapidly fatal and a source of major morbidity. There is frequently a family history of sudden infant death syndrome in siblings. Early recognition and prompt institution of therapy and appropriate preventive measures, and in certain cases specific therapy, may be life-saving and may significantly decrease long-term morbidity, particularly with respect to CNS sequelae. All currently known conditions are inherited as autosomal recessive traits. There are now at least 25 enzymes and specific transport proteins in the β-oxidation pathway and 18 have been associated with human disease. The most common defect is medium-chain acyl-CoA dehydrogenase (MCAD) deficiency, which had an incidence of 1 in 8930 live births in one series. The identification of serum acylcarnitines by electrospray ionization-tandem mass spectrometry of dried blood spots on filter paper in newborn screening programs has significantly enhanced the early recognition of these disorders.
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Affiliation(s)
- Ingrid Tein
- Neurometabolic Clinic and Research Laboratory, Division of Neurology and Genetics and Genome Biology Program, Research Institute, Hospital for Sick Children, University of Toronto, Toronto, Canada.
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33
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Adijanto J, Philp NJ. Cultured primary human fetal retinal pigment epithelium (hfRPE) as a model for evaluating RPE metabolism. Exp Eye Res 2014; 126:77-84. [PMID: 24485945 DOI: 10.1016/j.exer.2014.01.015] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Revised: 01/15/2014] [Accepted: 01/19/2014] [Indexed: 12/20/2022]
Abstract
Mitochondrial dysfunction has been shown to contribute to age-related and proliferative retinal diseases. Over the past decade, the primary human fetal RPE (hfRPE) culture model has emerged as an effective tool for studying RPE function and mechanisms of retinal diseases. This model system has been rigorously characterized and shown to closely resemble native RPE cells at the genomic and protein level, and that they are capable of accomplishing the characteristic functions of a healthy native RPE (e.g., rod phagocytosis, ion and fluid transport, and retinoid cycle). In this review, we demonstrated that the metabolic activity of the RPE is an indicator of its health and state of differentiation, and present the hfRPE culture model as a valuable in vitro system for evaluating RPE metabolism in the context of RPE differentiation and retinal disease.
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Affiliation(s)
- Jeffrey Adijanto
- Thomas Jefferson University, Dept. of Pathology, Anatomy, & Cell Biology, 1020 Locust Street, Rm315, Philadelphia, PA 19107, USA.
| | - Nancy J Philp
- Thomas Jefferson University, Dept. of Pathology, Anatomy, & Cell Biology, 1020 Locust Street, Rm315, Philadelphia, PA 19107, USA.
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Olpin SE. Pathophysiology of fatty acid oxidation disorders and resultant phenotypic variability. J Inherit Metab Dis 2013; 36:645-58. [PMID: 23674167 PMCID: PMC7101856 DOI: 10.1007/s10545-013-9611-5] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/27/2012] [Revised: 03/27/2013] [Accepted: 04/10/2013] [Indexed: 12/16/2022]
Abstract
Fatty acids are a major fuel for the body and fatty acid oxidation is particularly important during fasting, sustained aerobic exercise and stress. The myocardium and resting skeletal muscle utilise long-chain fatty acids as a major source of energy. Inherited disorders affecting fatty acid oxidation seriously compromise the function of muscle and other highly energy-dependent tissues such as brain, nerve, heart, kidney and liver. Such defects encompass a wide spectrum of clinical disease, presenting in the neonatal period or infancy with recurrent hypoketotic hypoglycaemic encephalopathy, liver dysfunction, hyperammonaemia and often cardiac dysfunction. In older children, adolescence or adults there is often exercise intolerance with episodic myalgia or rhabdomyolysis in association with prolonged aerobic exercise or other exacerbating factors. Some disorders are particularly associated with toxic metabolites that may contribute to encephalopathy, polyneuropathy, axonopathy and pigmentary retinopathy. The phenotypic diversity encountered in defects of fat oxidation is partly explained by genotype/phenotype correlation and certain identifiable environmental factors but there remain many unresolved questions regarding the complex interaction of genetic, epigenetic and environmental influences that dictate phenotypic expression. It is becoming increasingly clear that the view that most inherited disorders are purely monogenic diseases is a naive concept. In the future our approach to understanding the phenotypic diversity and management of patients will be more realistically achieved from a polygenic perspective.
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Affiliation(s)
- Simon E Olpin
- Department of Clinical Chemistry, Sheffield Children's Hospital, Sheffield S10 2TH, UK.
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35
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A possible role for mitochondrial dysfunction in migraine. Mol Genet Genomics 2012; 287:837-44. [DOI: 10.1007/s00438-012-0723-7] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2012] [Accepted: 09/22/2012] [Indexed: 10/27/2022]
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36
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Brain transcriptional responses to high-fat diet in Acads-deficient mice reveal energy sensing pathways. PLoS One 2012; 7:e41709. [PMID: 22936979 PMCID: PMC3425564 DOI: 10.1371/journal.pone.0041709] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2012] [Accepted: 06/27/2012] [Indexed: 12/13/2022] Open
Abstract
Background How signals from fatty acid metabolism are translated into changes in food intake remains unclear. Previously we reported that mice with a genetic inactivation of Acads (acyl-coenzyme A dehydrogenase, short-chain), the enzyme responsible for mitochondrial beta-oxidation of C4–C6 short-chain fatty acids (SCFAs), shift consumption away from fat and toward carbohydrate when offered a choice between diets. In the current study, we sought to indentify candidate genes and pathways underlying the effects of SCFA oxidation deficiency on food intake in Acads−/− mice. Methodology/Principal Findings We performed a transcriptional analysis of gene expression in brain tissue of Acads−/− and Acads+/+ mice fed either a high-fat (HF) or low-fat (LF) diet for 2 d. Ingenuity Pathway Analysis revealed three top-scoring pathways significantly modified by genotype or diet: oxidative phosphorylation, mitochondrial dysfunction, and CREB signaling in neurons. A comparison of statistically significant responses in HF Acads−/− vs. HF Acads+/+ (3917) and Acads+/+ HF vs. LF Acads+/+ (3879) revealed 2551 genes or approximately 65% in common between the two experimental comparisons. All but one of these genes were expressed in opposite direction with similar magnitude, demonstrating that HF-fed Acads-deficient mice display transcriptional responses that strongly resemble those of Acads+/+ mice fed LF diet. Intriguingly, genes involved in both AMP-kinase regulation and the neural control of food intake followed this pattern. Quantitative RT-PCR in hypothalamus confirmed the dysregulation of genes in these pathways. Western blotting showed an increase in hypothalamic AMP-kinase in Acads−/− mice and HF diet increased, a key protein in an energy-sensing cascade that responds to depletion of ATP. Conclusions Our results suggest that the decreased beta-oxidation of short-chain fatty acids in Acads-deficient mice fed HF diet produces a state of energy deficiency in the brain and that AMP-kinase may be the cellular energy-sensing mechanism linking fatty acid oxidation to feeding behavior in this model.
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37
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Fletcher AL, Pennesi ME, Harding CO, Weleber RG, Gillingham MB. Observations regarding retinopathy in mitochondrial trifunctional protein deficiencies. Mol Genet Metab 2012; 106:18-24. [PMID: 22459206 PMCID: PMC3506186 DOI: 10.1016/j.ymgme.2012.02.015] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Revised: 02/23/2012] [Accepted: 02/23/2012] [Indexed: 12/31/2022]
Abstract
Although the retina is thought to primarily rely on glucose for fuel, inherited deficiency of one or more activities of mitochondrial trifunctional protein results in a pigmentary retinopathy leading to vision loss. Many other enzymatic deficiencies in fatty acid oxidation pathways have been described, none of which results in retinal complications. The etiology of retinopathy among patients with defects in trifunctional protein is unknown. Trifunctional protein is a heteroctomer; two genes encode the alpha and beta subunits of TFP respectively, HADHA and HADHB. A common mutation in HADHA, c.1528G>C, leads to a single amino acid substitution, p. Glu474Gln, and impairs primarily long-chain 3-hydroxyacyl-CoA dehydrogenase (LCHAD) activity leading to LCHAD deficiency (LCHADD). Other mutations in HADHA or HADHB often lead to significant reduction in all three enzymatic activities and result in trifunctional protein deficiency (TFPD). Despite many similarities in clinical presentation and phenotype, there is growing evidence that they can result in different chronic complications. This review will outline the clinical similarities and differences between LCHADD and TFPD, describe the course of the associated retinopathy, propose a genotype/phenotype correlation with the severity of retinopathy, and discuss the current theories about the etiology of the retinopathy.
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Affiliation(s)
- Autumn L Fletcher
- Department of Molecular & Medical Genetics, School of Medicine, Oregon Health & Science University, Mail Code L-103, 3181 SW Sam Jackson Park Rd Portland, OR 97239, USA.
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Tonin AM, Grings M, Knebel LA, Zanatta Â, Moura AP, Ribeiro CAJ, Leipnitz G, Wajner M. Disruption of redox homeostasis in cerebral cortex of developing rats by acylcarnitines accumulating in medium-chain acyl-CoA dehydrogenase deficiency. Int J Dev Neurosci 2012; 30:383-90. [PMID: 22472139 DOI: 10.1016/j.ijdevneu.2012.03.238] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2012] [Revised: 03/07/2012] [Accepted: 03/17/2012] [Indexed: 12/13/2022] Open
Abstract
Medium-chain fatty acids and acylcarnitines accumulate in medium-chain acyl-CoA dehydrogenase deficiency (MCADD), the most frequent fatty acid oxidation defect clinically characterized by episodic crises with vomiting, seizures and coma. Considering that the pathophysiology of the neurological symptoms observed in MCADD is poorly known and, to our knowledge, there is no report on the involvement of acylcarnitines in the brain damage presented by the affected patients, the objective of the present study was to investigate the in vitro effects of hexanoylcarnitine (HC), octanoylcarnitine, decanoylcarnitine (DC) and cis-4-decenoylcarnitine (cDC) at concentrations varying from 0.01 to 1.0mM on important oxidative stress parameters in cerebral cortex of young rats. HC, DC and cDC significantly induced lipid peroxidation, as determined by increased thiobarbituric acid-reactive substances (TBA-RS) values. In addition, carbonyl formation was significantly augmented and sulfhydryl content diminished by DC, reflecting induction of protein oxidative damage. HC, DC and cDC also decreased glutathione (GSH) levels, the most important brain antioxidant defense. Furthermore, DC-induced elevation of TBA-RS values and decrease of GSH levels were prevented by the free radical scavengers melatonin and α-tocopherol, indicating the involvement of reactive oxygen species in these effects. We also found that l-carnitine itself did not induce lipid and protein oxidative damage, neither reduced the antioxidant defenses. Our present data show that the major medium-chain acylcarnitines accumulating in MCADD elicit oxidative stress in rat brain. It is therefore presumed that these compounds may be involved to a certain extent in the pathogenesis of the neurologic dysfunction of MCADD.
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Affiliation(s)
- Anelise M Tonin
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
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Bereta G, Palczewski K. Heterogeneous N-terminal acylation of retinal proteins results from the retina's unusual lipid metabolism. Biochemistry 2011; 50:3764-76. [PMID: 21449552 DOI: 10.1021/bi200245t] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Protein N-myristoylation occurs by a covalent attachment of a C14:0 fatty acid to the N-terminal Gly residue. This reaction is catalyzed by a N-myristoyltransferase that uses myristoyl-coenzyme A as substrate. But proteins in the retina also undergo heterogeneous N-acylation with C14:2, C14:1, and C12:0 fatty acids. The basis and the role of this retina-specific phenomenon are poorly understood. We studied guanylate cyclase-activating protein 1 (GCAP1) as an example of retina-specific heterogeneously N-acylated protein. The types and the abundance of fatty acids bound to bovine retinal GCAP1 were C14:2, 37.0%; C14:0, 32.4%; C14:1, 22.3%; and C12:0, 8.3% as quantified by liquid chromatography coupled mass spectrometry. We also devised a method for N-acylating proteins in vitro and used it to modify GCAP1 with acyl moieties of different lengths. Analysis of these GCAPs both confirmed that N-terminal acylation of GCAP1 is critical for its high activity and proper Ca(2+)-dependent response and revealed comparable functionality for GCAP1 with acyl moieties of various lengths. We also tested the hypothesis that retinal heterogeneous N-acylation results from retinal enrichment of unusual N-myristoyltransferase substrates. Thus, acyl-coenzyme A esters were purified from both bovine retina and brain and analyzed by liquid chromatography coupled mass spectrometry. Substantial differences in acyl-coenzyme A profiles between the retina and brain were detected. Importantly, the ratios of uncommon N-acylation substrates--C14:2- and C14:1-coenyzme A to C14:0-coenzyme A--were higher in the retina than in the brain. Thus, our results suggest that heterogeneous N-acylation, responsible for expansion of retinal proteome, reflects the unique character of retinal lipid metabolism. Additionally, we propose a new hypothesis explaining the physiological relevance of elevated retinal ratios of C14:2- and C14:1-coenzyme A to C14:0-coenzyme A.
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Affiliation(s)
- Grzegorz Bereta
- Department of Pharmacology, School of Medicine, Case Western Reserve University, Cleveland, Ohio 44106-4965, USA
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Desbrée A, Houdon L, Touati G, Djemili S, Choker G, Flodrops H. Infection à EBV révélatrice à l’âge de 3 ans d’un déficit en 3-hydroxyacyl-CoA déshydrogénase des acides gras à chaîne longue (LCHAD). Arch Pediatr 2011; 18:18-22. [DOI: 10.1016/j.arcped.2010.09.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2009] [Revised: 02/14/2010] [Accepted: 09/06/2010] [Indexed: 11/24/2022]
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Immunohistochemical localization of mitochondrial fatty acid β-oxidation enzymes in Müller cells of the retina. Histochem Cell Biol 2010; 134:565-79. [DOI: 10.1007/s00418-010-0752-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/12/2010] [Indexed: 12/30/2022]
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Schuck PF, Ferreira GDC, Tahara EB, Klamt F, Kowaltowski AJ, Wajner M. cis-4-decenoic acid provokes mitochondrial bioenergetic dysfunction in rat brain. Life Sci 2010; 87:139-46. [PMID: 20540954 DOI: 10.1016/j.lfs.2010.05.019] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2010] [Revised: 05/14/2010] [Accepted: 05/25/2010] [Indexed: 10/19/2022]
Abstract
AIMS In the present work we investigated the in vitro effect of cis-4-decenoic acid, the pathognomonic metabolite of medium-chain acyl-CoA dehydrogenase deficiency, on various parameters of bioenergetic homeostasis in rat brain mitochondria. MAIN METHODS Respiratory parameters determined by oxygen consumption were evaluated, as well as membrane potential, NAD(P)H content, swelling and cytochrome c release in mitochondrial preparations from rat brain, using glutamate plus malate or succinate as substrates. The activities of citric acid cycle enzymes were also assessed. KEY FINDINGS cis-4-decenoic acid markedly increased state 4 respiration, whereas state 3 respiration and the respiratory control ratio were decreased. The ADP/O ratio, the mitochondrial membrane potential, the matrix NAD(P)H levels and aconitase activity were also diminished by cis-4-decenoic acid. These data indicate that this fatty acid acts as an uncoupler of oxidative phosphorylation and as a metabolic inhibitor. cis-4-decenoic acid also provoked a marked mitochondrial swelling when either KCl or sucrose was used in the incubation medium and also induced cytochrome c release from mitochondria, suggesting a non-selective permeabilization of the inner mitochondrial membrane. SIGNIFICANCE It is therefore presumed that impairment of mitochondrial homeostasis provoked by cis-4-decenoic acid may be involved in the brain dysfunction observed in medium-chain acyl-CoA dehydrogenase deficient patients.
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Affiliation(s)
- Patrícia Fernanda Schuck
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
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Tonin AM, Ferreira GC, Grings M, Viegas CM, Busanello EN, Amaral AU, Zanatta A, Schuck PF, Wajner M. Disturbance of mitochondrial energy homeostasis caused by the metabolites accumulating in LCHAD and MTP deficiencies in rat brain. Life Sci 2010; 86:825-31. [PMID: 20399795 DOI: 10.1016/j.lfs.2010.04.003] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2010] [Revised: 03/31/2010] [Accepted: 04/02/2010] [Indexed: 12/31/2022]
Abstract
AIMS We investigated the in vitro effects of 3-hydroxydodecanoic (3HDA), 3-hydroxytetradecanoic (3HTA) and 3-hydroxypalmitic (3HPA) acids, which accumulate in tissues of patients affected by mitochondrial trifunctional protein (MTP) and isolated long-chain 3-hydroxyacyl-CoA dehydrogenase (LCHAD) deficiencies, on various parameters of energy homeostasis in mitochondrial preparations from brain of young rats. MAIN METHODS We measured the respiratory parameters state 4, state 3, respiratory control ratio (RCR) and ADP/O ratio by the rate of oxygen consumption, as well as the mitochondrial membrane potential and the matrix NAD(P)H levels in the presence of the fatty acids. KEY FINDINGS We found that 3HDA, 3HTA and 3HPA markedly increased state 4 respiration and diminished the RCR using glutamate plus malate or succinate as substrates. 3HTA and 3HPA also diminished the mitochondrial membrane potential and the matrix NAD(P)H levels. In addition, 3HTA decreased state 3 respiration using glutamate/malate, but not pyruvate/malate or succinate as substrates. Our data indicate that the long-chain 3-hydroxy fatty acids that accumulate in LCHAD/MTP deficiencies act as uncouplers of oxidative phosphorylation, while 3HTA also behaves as a metabolic inhibitor. SIGNIFICANCE It is presumed that impairment of brain energy homeostasis caused by these endogenous accumulating compounds may contribute at least in part to the neuropathology of LCHAD/MTP deficiencies.
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Affiliation(s)
- Anelise M Tonin
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
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Tonin AM, Grings M, Busanello ENB, Moura AP, Ferreira GC, Viegas CM, Fernandes CG, Schuck PF, Wajner M. Long-chain 3-hydroxy fatty acids accumulating in LCHAD and MTP deficiencies induce oxidative stress in rat brain. Neurochem Int 2010; 56:930-6. [PMID: 20381565 DOI: 10.1016/j.neuint.2010.03.025] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2010] [Revised: 03/23/2010] [Accepted: 03/29/2010] [Indexed: 01/07/2023]
Abstract
Accumulation of long-chain 3-hydroxy fatty acids is the biochemical hallmark of long-chain 3-hydroxyacyl-CoA dehydrogenase (LCHAD) and mitochondrial trifunctional protein (MTP) deficiencies. These disorders are clinically characterized by neurological symptoms, such as convulsions and lethargy, as well as by cardiomyopathy and muscle weakness. In the present work we investigated the in vitro effect of 3-hydroxydodecanoic (3HDA), 3-hydroxytetradecanoic (3HTA) and 3-hydroxypalmitic (3HPA) acids, which accumulate in these disorders, on important oxidative stress parameters in cerebral cortex of young rats in the hope to clarify the mechanisms leading to the brain damage found in patients affected by these disorders. It was first verified that these compounds significantly induced lipid peroxidation, as determined by increased thiobarbituric acid-reactive substances levels. In addition, carbonyl formation was significantly increased and sulfhydryl content decreased by 3HTA and 3HPA, which indicates that these fatty acids elicit protein oxidative damage. 3HTA and 3HPA also diminished the reduced glutathione (GSH) levels, without affecting nitrate and nitrite production. Finally, we observed that the addition of the antioxidants and free radical scavengers trolox and deferoxamine (DFO) was able to partially prevent lipid oxidative damage, whereas DFO fully prevented the reduction on GSH levels induced by 3HTA. Our present data showing that 3HDA, 3HTA and 3HPA elicit oxidative stress in rat brain indicate that oxidative damage may represent an important pathomechanism involved in the neurologic symptoms manifested by patients affected by LCHAD and MTP deficiencies.
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Affiliation(s)
- Anelise M Tonin
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
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Lang TF. Adult presentations of medium-chain acyl-CoA dehydrogenase deficiency (MCADD). J Inherit Metab Dis 2009; 32:675-683. [PMID: 19821147 DOI: 10.1007/s10545-009-1202-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2009] [Revised: 07/20/2009] [Accepted: 08/25/2009] [Indexed: 12/27/2022]
Abstract
Medium-chain acyl-CoA dehydrogenase deficiency (MCADD) is an autosomal recessive disorder of mitochondrial fatty acid oxidation which is usually diagnosed in infancy or through neonatal screening. In the absence of population screening, adults with undiagnosed MCADD can be expected. This review discusses 14 cases that were identified during adulthood. The mortality of infantile patients is approximately 25% whereas in this adult case series it was shown it to be 50% in acutely presenting patients and 29% in total. Therefore, undiagnosed individuals are at risk of sudden fatal metabolic decompensation with high mortality. This review illustrates the need to consider the possibility of a fatty acid oxidation defect in an adult who presents with unexplained sudden clinical deterioration, particularly if precipitated by fasting or alcohol consumption. A history of unexplained sibling death may also raise the index of suspicion. There also needs to be appropriate clinical support for those patients identified clinically or as a result of family studies (sibling or parent).
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Affiliation(s)
- T F Lang
- Department of Clinical Biochemistry, Royal Victoria Hospital, Grosvenor Road, Belfast, BT12 6BA, Northern Ireland, UK.
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Schuck PF, Ferreira GDC, Tonin AM, Viegas CM, Busanello ENB, Moura AP, Zanatta A, Klamt F, Wajner M. Evidence that the major metabolites accumulating in medium-chain acyl-CoA dehydrogenase deficiency disturb mitochondrial energy homeostasis in rat brain. Brain Res 2009; 1296:117-26. [PMID: 19703432 DOI: 10.1016/j.brainres.2009.08.053] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2009] [Revised: 08/14/2009] [Accepted: 08/17/2009] [Indexed: 11/16/2022]
Abstract
Medium-chain acyl-CoA dehydrogenase deficiency (MCADD) is an inherited metabolic disorder of fatty acid oxidation in which the affected patients predominantly present high levels of octanoic (OA) and decanoic (DA) acids and their glycine and carnitine by-products in tissues and body fluids. It is clinically characterized by episodic encephalopathic crises with coma and seizures, as well as by progressive neurological involvement, whose pathophysiology is poorly known. In the present work, we investigated the in vitro effects of OA and DA on various parameters of energy homeostasis in mitochondrial preparations from brain of young rats. We found that OA and DA markedly increased state 4 respiration and diminished state 3 respiration as well as the respiratory control ratio, the mitochondrial membrane potential and the matrix NAD(P)H levels. In addition, DA-elicited increase in oxygen consumption in state 4 respiration was partially prevented by atractyloside, indicating the involvement of the adenine nucleotide translocator. OA and DA also reduced ADP/O ratio, CCCP-stimulated respiration and the activities of respiratory chain complexes. The data indicate that the major accumulating fatty acids in MCADD act as uncouplers of oxidative phosphorylation and as metabolic inhibitors. Furthermore, DA, but not OA, provoked a marked mitochondrial swelling and cytochrome c release from mitochondria, reflecting a permeabilization of the inner mitochondrial membrane. Taken together, these data suggest that OA and DA impair brain mitochondrial energy homeostasis that could underlie at least in part the neuropathology of MCADD.
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Affiliation(s)
- Patrícia Fernanda Schuck
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
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Stopek D, Gitteau Lala E, Labarthe F, Le Lez ML, Majzoub S, Castelnau P, Pisella PJ. [Long-chain 3-hydroxyacyl CoA dehydrogenase deficiency and choroidal neovascularization]. J Fr Ophtalmol 2008; 31:993-8. [PMID: 19107076 DOI: 10.1016/s0181-5512(08)74746-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
We report the case of a 9-year-old girl with a long-chain 3-hydroxyacyl CoA dehydrogenase (LCHAD) deficiency. This enzyme participates in mitochondrial fatty acid B-oxidation. Genetic fatty acid oxidation defects induce cellular energetic deficiency, and thus early life-threatening manifestations. An appropriate diet prevents these severe disorders. Nevertheless, LCHAD deficiency is the only B-oxidation enzymatic disorder that induces a chorioretinopathy, predominating at the posterior pole. We describe the first case of bilateral macular choroidal neovascularization. One eye presented a fibrovascular lesion. The other eye presented an active neovascularization stabilized by two dynamic phototherapies. The specificity of choroidal degeneration related to LCHAD deficiency remains unknown. Reviewing of literature and biochemical mechanisms suggests that fatty acid oxidative stress rather than a mitochondrial energetic defect is involved. For practical purposes, this report emphasizes the importance of ophthalmological follow-up of these patients.
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Affiliation(s)
- D Stopek
- Service d'Ophtalmologie, Hôpital Bretonneau, Tours.
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48
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Abstract
Inherited defects in mitochondrial fatty-acid beta-oxidation comprise a group of at least 12 diseases characterized by distinct enzyme or transporter deficiencies. Most of these diseases have a variable age of onset and clinical severity. Symptoms are often episodic and associated with mild viral illness, physiologic stress, or prolonged exercise that overwhelms the ability of mitochondria to oxidize fatty acids. Depending on the specific genetic defect, patients develop fasting hypoketotic hypoglycemia, cardiomyopathy, rhabdomyolysis, liver dysfunction, or sudden death. Neuropathy and pigmentary retinopathy are seen in some of the diseases. The diagnosis is based on finding an accumulation of specific biochemical markers such as acylcarnitine metabolites in blood and urinary dicarboxylic acids and acylglycines. Confirmatory testing requires enzymatic studies and DNA analysis. Therapeutic approaches are generally effective in preventing severe symptomatic episodes, including sudden death. Newborn screening for fatty-acid oxidation disorders promises to identify many affected patients before the onset of symptoms.
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Affiliation(s)
- Michelle Kompare
- Department of Pediatrics, University of Nebraska Medical Center, Omaha, NE 68198, USA
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49
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Fahnehjelm KT, Holmström G, Ying L, Haglind CB, Nordenström A, Halldin M, Alm J, Nemeth A, von Döbeln U. Ocular characteristics in 10 children with long-chain 3-hydroxyacyl-CoA dehydrogenase deficiency: a cross-sectional study with long-term follow-up. Acta Ophthalmol 2008; 86:329-37. [PMID: 18162058 DOI: 10.1111/j.1600-0420.2007.01121.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
PURPOSE To present long-term ocular complications and electroretinographic (ERG) findings in children with long-chain 3-hydroxyacyl-CoA dehydrogenase (LCHAD) deficiency - a life-threatening metabolic disease - and the relation to age at diagnosis, treatment and other clinical parameters. METHODS Ten children with LCHAD deficiency underwent repeated ophthalmological evaluations including ERG. RESULTS All 10 children developed chorioretinal pathology. Regardless of age at diagnosis, initiation of treatment and age at examination, inter-individual differences were present. Profound chorioretinal atrophy, severe visual impairment and progressive myopia had developed in two teenagers. Milder chorioretinopathy with or without subnormal visual acuity was present in all other children. ERG was pathological in seven children. The chorioretinopathy often started in the peripapillary or perimacular areas. In one patient, unilateral visual impairment was associated with fibrosis. CONCLUSION Early diagnosis and adequate therapy might delay but not prevent the progression of retinal complications. Late diagnosis with severe symptoms at diagnosis, neonatal hypoglycaemia and frequent decompensations may increase the progression rate of the chorioretinopathy. LCHAD deficiency, a potentially lethal disease, is sometimes difficult to diagnose. Unusual chorioretinal findings should alert the ophthalmologist to the long-chain 3-hydroxyacyl-CoA dehydrogenase deficiency, especially if there is a history of neonatal hypoglycaemia or failure to thrive.
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50
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He M, Rutledge SL, Kelly DR, Palmer CA, Murdoch G, Majumder N, Nicholls RD, Pei Z, Watkins PA, Vockley J. A new genetic disorder in mitochondrial fatty acid beta-oxidation: ACAD9 deficiency. Am J Hum Genet 2007; 81:87-103. [PMID: 17564966 PMCID: PMC1950923 DOI: 10.1086/519219] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2007] [Accepted: 04/10/2007] [Indexed: 11/03/2022] Open
Abstract
The acyl-CoA dehydrogenases are a family of multimeric flavoenzymes that catalyze the alpha,beta -dehydrogenation of acyl-CoA esters in fatty acid beta -oxidation and amino acid catabolism. Genetic defects have been identified in most of the acyl-CoA dehydrogenases in humans. Acyl-CoA dehydrogenase 9 (ACAD9) is a recently identified acyl-CoA dehydrogenase that demonstrates maximum activity with unsaturated long-chain acyl-CoAs. We now report three cases of ACAD9 deficiency. Patient 1 was a 14-year-old, previously healthy boy who died of a Reye-like episode and cerebellar stroke triggered by a mild viral illness and ingestion of aspirin. Patient 2 was a 10-year-old girl who first presented at age 4 mo with recurrent episodes of acute liver dysfunction and hypoglycemia, with otherwise minor illnesses. Patient 3 was a 4.5-year-old girl who died of cardiomyopathy and whose sibling also died of cardiomyopathy at age 21 mo. Mild chronic neurologic dysfunction was reported in all three patients. Defects in ACAD9 mRNA were identified in the first two patients, and all patients manifested marked defects in ACAD9 protein. Despite a significant overlap of substrate specificity, it appears that ACAD9 and very-long-chain acyl-CoA dehydrogenase are unable to compensate for each other in patients with either deficiency. Studies of the tissue distribution and gene regulation of ACAD9 and very-long-chain acyl-CoA dehydrogenase identify the presence of two independently regulated functional pathways for long-chain fat metabolism, indicating that these two enzymes are likely to be involved in different physiological functions.
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MESH Headings
- Acyl-CoA Dehydrogenase, Long-Chain/analysis
- Acyl-CoA Dehydrogenase, Long-Chain/chemistry
- Acyl-CoA Dehydrogenase, Long-Chain/genetics
- Acyl-CoA Dehydrogenase, Long-Chain/isolation & purification
- Adolescent
- Base Sequence
- Brain/enzymology
- Child
- DNA Mutational Analysis
- Fatty Acids/metabolism
- Female
- Gene Expression Regulation
- Genome, Human
- Humans
- Lipid Metabolism, Inborn Errors/genetics
- Male
- Mitochondrial Diseases/genetics
- Molecular Sequence Data
- Muscle, Skeletal/enzymology
- Promoter Regions, Genetic
- RNA, Messenger/analysis
- RNA, Messenger/metabolism
- Recombinant Proteins/chemistry
- Recombinant Proteins/genetics
- Recombinant Proteins/isolation & purification
- Substrate Specificity
- Tissue Distribution
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Affiliation(s)
- M He
- Children's Hospital of Pittsburgh, Department of Pediatrics, University of Pittsburgh, School of Medicine, Pittsburgh, PA, 15213, USA
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