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Shindo A, Ueda K, Minatsuki S, Nakayama Y, Hatsuse S, Fujita K, Nomura S, Hatano M, Takeda N, Akazawa H, Komuro I. Novel AGL variants in a patient with glycogen storage disease type IIIb and pulmonary hypertension caused by pulmonary veno-occlusive disease: A case report. Front Genet 2023; 14:1148067. [PMID: 37035733 PMCID: PMC10078958 DOI: 10.3389/fgene.2023.1148067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Accepted: 03/14/2023] [Indexed: 04/11/2023] Open
Abstract
Glycogen storage disease type III (GSD-III) is an autosomal recessive metabolic disorder caused by mutations in the AGL gene, and may develop various types of pulmonary hypertension (PH). Here, we report a case of 24-year-old man with GSD-IIIb with two novel null variants in AGL (c.2308 + 2T>C and c.3045_3048dupTACC). He developed multi-drug-resistant pulmonary veno-occlusive disease (PVOD) and was registered as a candidate for lung transplantation. No pathogenic variants were detected in previously known causative genes for pulmonary hypertension and the underlying mechanism of coincidence of two rare diseases was unknown. We discuss the association of the loss of glycogen-debranching enzyme with incident PVOD.
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Tran JQ, Grover D, Zhang M, Stapels M, Brennan R, Bangari DS, Piepenhagen PA, Roberts E, Oliva P, Zubair F, Vela JL, Richards SM, Joseph AM. Expansion of immature, nucleated red blood cells by transient low-dose methotrexate immune tolerance induction in mice. Clin Exp Immunol 2021; 203:409-423. [PMID: 33205401 PMCID: PMC7874831 DOI: 10.1111/cei.13552] [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: 07/20/2020] [Revised: 10/26/2020] [Accepted: 10/27/2020] [Indexed: 11/28/2022] Open
Abstract
Biological treatments such as enzyme-replacement therapies (ERT) can generate anti-drug antibodies (ADA), which may reduce drug efficacy and impact patient safety and consequently led to research to mitigate ADA responses. Transient low-dose methotrexate (TLD-MTX) as a prophylactic ITI regimen, when administered concurrently with ERT, induces long-lived reduction of ADA to recombinant human alglucosidase alfa (rhGAA) in mice. In current clinical practice, a prophylactic ITI protocol that includes TLD-MTX, rituximab and intravenous immunoglobulin (optional), successfully induced lasting control of ADA to rhGAA in high-risk, cross-reactive immunological material (CRIM)-negative infantile-onset Pompe disease (IOPD) patients. More recently, evaluation of TLD-MTX demonstrated benefit in CRIM-positive IOPD patients. To more clearly understand the mechanism for the effectiveness of TLD-MTX, non-targeted transcriptional and proteomic screens were conducted and revealed up-regulation of erythropoiesis signatures. Confirmatory studies showed transiently larger spleens by weight, increased spleen cellularity and that following an initial reduction of mature red blood cells (RBCs) in the bone marrow and blood, a significant expansion of Ter-119+ CD71+ immature RBCs was observed in spleen and blood of mice. Histology sections revealed increased nucleated cells, including hematopoietic precursors, in the splenic red pulp of these mice. This study demonstrated that TLD-MTX induced a transient reduction of mature RBCs in the blood and immature RBCs in the bone marrow followed by significant enrichment of immature, nucleated RBCs in the spleen and blood during the time of immune tolerance induction, which suggested modulation of erythropoiesis may be associated with the induction of immune tolerance to rhGAA.
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Affiliation(s)
- J. Q. Tran
- Sanofi Immunology and Inflammation Research Therapeutic AreaCambridgeMAUSA
| | - D. Grover
- Sanofi Immunology and Inflammation Research Therapeutic AreaCambridgeMAUSA
| | - M. Zhang
- Sanofi Translational Sciences BioinformaticsCambridgeMAUSA
| | - M. Stapels
- Sanofi Biologics DevelopmentCambridgeMAUSA
| | | | | | | | - E. Roberts
- Sanofi Translational In Vivo ModelsCambridgeMAUSA
| | - P. Oliva
- Sanofi Immunology and Inflammation Research Therapeutic AreaCambridgeMAUSA
| | - F. Zubair
- Sanofi Immunology and Inflammation Research Therapeutic AreaCambridgeMAUSA
| | - J. L. Vela
- Sanofi Immunology and Inflammation Research Therapeutic AreaCambridgeMAUSA
| | - S. M. Richards
- Sanofi Translational Medicine and Early DevelopmentCambridgeMAUSA
| | - A. M. Joseph
- Sanofi Immunology and Inflammation Research Therapeutic AreaCambridgeMAUSA
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Ogunbayo OA, Duan J, Xiong J, Wang Q, Feng X, Ma J, Zhu MX, Evans AM. mTORC1 controls lysosomal Ca 2+ release through the two-pore channel TPC2. Sci Signal 2018; 11:11/525/eaao5775. [PMID: 29636391 DOI: 10.1126/scisignal.aao5775] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Two-pore segment channel 2 (TPC2) is a ubiquitously expressed, lysosomally targeted ion channel that aids in terminating autophagy and is inhibited upon its association with mechanistic target of rapamycin (mTOR). It is controversial whether TPC2 mediates lysosomal Ca2+ release or selectively conducts Na+ and whether the binding of nicotinic acid adenine dinucleotide phosphate (NAADP) or phosphatidylinositol 3,5-bisphosphate [PI(3,5)P2] is required for the activity of this ion channel. We show that TPC2 is required for intracellular Ca2+ signaling in response to NAADP or to mTOR inhibition by rapamycin. In pulmonary arterial myocytes, rapamycin and NAADP evoked global Ca2+ transients that were blocked by depletion of lysosomal Ca2+ stores. Preincubation of cells with high concentrations of rapamycin resulted in desensitization and blocked NAADP-evoked Ca2+ signals. Moreover, rapamycin and NAADP did not evoke discernable Ca2+ transients in myocytes derived from Tpcn2 knockout mice, which showed normal responses to other Ca2+-mobilizing signals. In HEK293 cells stably overexpressing human TPC2, shRNA-mediated knockdown of mTOR blocked rapamycin- and NAADP-evoked Ca2+ signals. Confocal imaging of a genetically encoded Ca2+ indicator fused to TPC2 demonstrated that rapamycin-evoked Ca2+ signals localized to lysosomes and were in close proximity to TPC2. Therefore, inactivation of mTOR may activate TPC2 and consequently lysosomal Ca2+ release.
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Affiliation(s)
- Oluseye A Ogunbayo
- Centres for Discovery Brain Sciences and Cardiovascular Sciences, Biomedical Sciences, Edinburgh Medical School, University of Edinburgh, Edinburgh, EH8 9XD Scotland, UK
| | - Jingxian Duan
- Centres for Discovery Brain Sciences and Cardiovascular Sciences, Biomedical Sciences, Edinburgh Medical School, University of Edinburgh, Edinburgh, EH8 9XD Scotland, UK
| | - Jian Xiong
- Department of Integrative Biology and Pharmacology, McGovern Medical School, Program in Biochemistry and Cell Biology, Graduate School of Biomedical Sciences, University of Texas Health Science Center at Houston, Houston, TX 77030, USA
| | - Qiaochu Wang
- Department of Integrative Biology and Pharmacology, McGovern Medical School, Program in Biochemistry and Cell Biology, Graduate School of Biomedical Sciences, University of Texas Health Science Center at Houston, Houston, TX 77030, USA
| | - Xinghua Feng
- Department of Integrative Biology and Pharmacology, McGovern Medical School, Program in Biochemistry and Cell Biology, Graduate School of Biomedical Sciences, University of Texas Health Science Center at Houston, Houston, TX 77030, USA
| | - Jianjie Ma
- Department of Surgery, Davis Heart and Lung Research Institute, The Ohio State University, Columbus, OH 43210, USA
| | - Michael X Zhu
- Department of Integrative Biology and Pharmacology, McGovern Medical School, Program in Biochemistry and Cell Biology, Graduate School of Biomedical Sciences, University of Texas Health Science Center at Houston, Houston, TX 77030, USA
| | - A Mark Evans
- Centres for Discovery Brain Sciences and Cardiovascular Sciences, Biomedical Sciences, Edinburgh Medical School, University of Edinburgh, Edinburgh, EH8 9XD Scotland, UK.
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Fameli N, Evans AM, van Breemen C. Tissue Specificity: The Role of Organellar Membrane Nanojunctions in Smooth Muscle Ca2+ Signaling. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 993:321-342. [DOI: 10.1007/978-3-319-57732-6_17] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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Evans AM. Nanojunctions of the Sarcoplasmic Reticulum Deliver Site- and Function-Specific Calcium Signaling in Vascular Smooth Muscles. ADVANCES IN PHARMACOLOGY (SAN DIEGO, CALIF.) 2016; 78:1-47. [PMID: 28212795 DOI: 10.1016/bs.apha.2016.10.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Vasoactive agents may induce myocyte contraction, dilation, and the switch from a contractile to a migratory-proliferative phenotype(s), which requires changes in gene expression. These processes are directed, in part, by Ca2+ signals, but how different Ca2+ signals are generated to select each function is enigmatic. We have previously proposed that the strategic positioning of Ca2+ pumps and release channels at membrane-membrane junctions of the sarcoplasmic reticulum (SR) demarcates cytoplasmic nanodomains, within which site- and function-specific Ca2+ signals arise. This chapter will describe how nanojunctions of the SR may: (1) define cytoplasmic nanospaces about the plasma membrane, mitochondria, contractile myofilaments, lysosomes, and the nucleus; (2) provide for functional segregation by restricting passive diffusion and by coordinating active ion transfer within a given nanospace via resident Ca2+ pumps and release channels; (3) select for contraction, relaxation, and/or changes in gene expression; and (4) facilitate the switch in myocyte phenotype through junctional reorganization. This should serve to highlight the need for further exploration of cellular nanojunctions and the mechanisms by which they operate, that will undoubtedly open up new therapeutic horizons.
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Affiliation(s)
- A M Evans
- Centre for Integrative Physiology, College of Medicine and Veterinary Medicine, University of Edinburgh, Edinburgh, United Kingdom.
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Fameli N, Ogunbayo OA, van Breemen C, Evans AM. Cytoplasmic nanojunctions between lysosomes and sarcoplasmic reticulum are required for specific calcium signaling. F1000Res 2014; 3:93. [PMID: 25126414 PMCID: PMC4126599 DOI: 10.12688/f1000research.3720.1] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 04/08/2014] [Indexed: 01/21/2023] Open
Abstract
Herein we demonstrate how nanojunctions between lysosomes and sarcoplasmic reticulum (L-SR junctions) serve to couple lysosomal activation to regenerative, ryanodine receptor-mediated cellular Ca
2+ waves. In pulmonary artery smooth muscle cells (PASMCs) it has been proposed that nicotinic acid adenine dinucleotide phosphate (NAADP) triggers increases in cytoplasmic Ca
2+ via L-SR junctions, in a manner that requires initial Ca
2+ release from lysosomes and subsequent Ca
2+-induced Ca
2+ release (CICR) via ryanodine receptor (RyR) subtype 3 on the SR membrane proximal to lysosomes. L-SR junction membrane separation has been estimated to be < 400 nm and thus beyond the resolution of light microscopy, which has restricted detailed investigations of the junctional coupling process. The present study utilizes standard and tomographic transmission electron microscopy to provide a thorough ultrastructural characterization of the L-SR junctions in PASMCs. We show that L-SR nanojunctions are prominent features within these cells and estimate that the junctional membrane separation and extension are about 15 nm and 300 nm, respectively. Furthermore, we develop a quantitative model of the L-SR junction using these measurements, prior kinetic and specific Ca
2+ signal information as input data. Simulations of NAADP-dependent junctional Ca
2+ transients demonstrate that the magnitude of these signals can breach the threshold for CICR via RyR3. By correlation analysis of live cell Ca
2+ signals and simulated Ca
2+ transients within L-SR junctions, we estimate that “trigger zones” comprising 60–100 junctions are required to confer a signal of similar magnitude. This is compatible with the 110 lysosomes/cell estimated from our ultrastructural observations. Most importantly, our model shows that increasing the L-SR junctional width above 50 nm lowers the magnitude of junctional [Ca
2+] such that there is a failure to breach the threshold for CICR via RyR3. L-SR junctions are therefore a pre-requisite for efficient Ca
2+signal coupling and may contribute to cellular function in health and disease.
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Affiliation(s)
- Nicola Fameli
- Department of Anesthesiology, Pharmacology, and Therapeutics, University of British Columbia, Vancouver, V6T 1Z3, Canada.,Centre for Integrative Physiology, University of Edinburgh, Edinburgh, EH8 9XD, UK.,Current address: Institute for Biophysics, Medical University of Graz, Graz, 8010, Austria
| | - Oluseye A Ogunbayo
- Centre for Integrative Physiology, University of Edinburgh, Edinburgh, EH8 9XD, UK
| | - Cornelis van Breemen
- Department of Anesthesiology, Pharmacology, and Therapeutics, University of British Columbia, Vancouver, V6T 1Z3, Canada
| | - A Mark Evans
- Centre for Integrative Physiology, University of Edinburgh, Edinburgh, EH8 9XD, UK
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Del Rizzo M, Fanin M, Cerutti A, Cazzorla C, Milanesi O, Nascimbeni AC, Angelini C, Giordano L, Bordugo A, Burlina AB. Long-term follow-up results in enzyme replacement therapy for Pompe disease: a case report. J Inherit Metab Dis 2010; 33 Suppl 3:S389-93. [PMID: 20830524 DOI: 10.1007/s10545-010-9195-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2010] [Revised: 08/11/2010] [Accepted: 08/23/2010] [Indexed: 12/01/2022]
Abstract
Pompe disease (PD) is a metabolic myopathy caused by a deficiency of acid-alpha glucosidase (GAA), a lysosomal enzyme that cleaves glycogen. The classic infantile-onset form is characterised by severe hypotonia and cardiomyopathy. Untreated patients usually die within the first year of life due to cardiorespiratory failure. Several studies involving patients with infantile-onset PD have shown that enzyme replacement therapy (ERT) with alglucosidase alfa, recombinant human GAA (rhGAA), significantly prolongs survival, decreases cardiomegaly, and improves cardiac function and conduction abnormalities. However, the efficacy on motor, cognitive and social milestones appears to be more related to the condition of the patient before the start of treatment. To date, the sample of early diagnosed and treated patients is small and the length of follow-up is still limited. We report the results of a long-term follow-up of one patient presenting severe bradycardia and cardiomyopathy at birth, diagnosed in the third day of life and successfully treated by ERT. Serum muscle enzymes at diagnosis were AST 200 U/L, ALT 99 U/L and CPK 731 U/L (n.v. 0-295); the molecular study identified the homozygous missense mutation c.1933 G> A p.Asp645Asn (GAA exon 14). Left Ventricular Mass Index (LVMI) at baseline was 171 g/m(2) (Z-score = 4.3) and decreased to normal values since the 3-month follow-up. A muscle biopsy performed at 18 months after the start of therapy, showed only a low degree of muscle involvement. To our knowledge, this is the longest ERT treatment follow-up in a symptomatic neonatal patient with Pompe disease.
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Affiliation(s)
- Monica Del Rizzo
- Division of Metabolic Diseases, Department of Paediatrics, University Hospital Padua, Via Giustiniani 3, 35128 Padua, Italy
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Staretz-Chacham O, Lang TC, LaMarca ME, Krasnewich D, Sidransky E. Lysosomal storage disorders in the newborn. Pediatrics 2009; 123:1191-207. [PMID: 19336380 PMCID: PMC2768319 DOI: 10.1542/peds.2008-0635] [Citation(s) in RCA: 144] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Lysosomal storage disorders are rare inborn errors of metabolism, with a combined incidence of 1 in 1500 to 7000 live births. These relatively rare disorders are seldom considered when evaluating a sick newborn. A significant number of the >50 different lysosomal storage disorders, however, do manifest in the neonatal period and should be part of the differential diagnosis of several perinatal phenotypes. We review the earliest clinical features, diagnostic tests, and treatment options for lysosomal storage disorders that can present in the newborn. Although many of the lysosomal storage disorders are characterized by a range in phenotypes, the focus of this review is on the specific symptoms and clinical findings that present in the perinatal period, including neurologic, respiratory, endocrine, and cardiovascular manifestations, dysmorphic features, hepatosplenomegaly, skin or ocular involvement, and hydrops fetalis/congenital ascites. A greater awareness of these features may help to reduce misdiagnosis and promote the early detection of lysosomal storage disorders. Implementing therapy at the earliest stage possible is crucial for several of the lysosomal storage disorders; hence, an early appreciation of these disorders by physicians who treat newborns is essential.
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Affiliation(s)
- Orna Staretz-Chacham
- Office of the Clinical Director, Medical Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland
| | - Tess C. Lang
- Section on Molecular Neurogenetics, Medical Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland
| | - Mary E. LaMarca
- Section on Molecular Neurogenetics, Medical Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland
| | - Donna Krasnewich
- Office of the Clinical Director, Medical Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland
| | - Ellen Sidransky
- Section on Molecular Neurogenetics, Medical Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland
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Montalvo ALE, Cariati R, Deganuto M, Guerci V, Garcia R, Ciana G, Bembi B, Pittis MG. Glycogenosis type II: identification and expression of three novel mutations in the acid alpha-glucosidase gene causing the infantile form of the disease. Mol Genet Metab 2004; 81:203-8. [PMID: 14972326 DOI: 10.1016/j.ymgme.2003.11.011] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2003] [Revised: 11/13/2003] [Accepted: 11/13/2003] [Indexed: 11/28/2022]
Abstract
Glycogenosis type II (GSDII) is an autosomal recessive disorder due to the deficiency of the lysosomal enzyme acid alpha-glucosidase (GAA). We identified three novel point mutations, C399A, T1064C, and C2104T, in three unrelated Italian patients with the infantile form of the disease. The C399A mutation was present in homozygosity in proband 1. The C >A transition introduces a premature stop signal in exon 2 resulting in no enzyme production that is correlated with the severe clinical phenotype in this patient. The other two nucleotide changes were missense mutations. The T1064C mutation, which changes Leu in position 355 into Pro, was carried in homozygosity by proband 2. The C2104T nucleotide change, which substitutes Arg 702 into Cys, was present in proband 3 in combination with a known severe mutation DeltaI17-18. The in vitro expression in COS-1 cells of T1064C and C2104T constructs demonstrated no enzymatic activity with respect to the negative control cells. Western blot analysis revealed that both T1064C and C2104T mutant proteins produced in COS-1 cells migrated in SDS-PAGE as the GAA inactive precursor of 110kDa. Immunofluorescence detection of mutant alpha-glucosidases showed enzyme localization primarily in the ER-Golgi compartment, suggesting that T1064C and C2104T mutations could affect the normal processing and stability of the enzyme. In vitro studies demonstrated that the same degree of deficiency in T1064C and C2104T mutations, which is in contrast with patient phenotype. A better correlation was observed with the in vivo studies since proband 2, with a less severe phenotype, presented with low residual enzyme activity while in proband 3, with a classic severe infantile onset GSDII, fibroblast enzyme activity was completely absent.
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Affiliation(s)
- Anna Lisa E Montalvo
- Unità Operativa Dipartimentale di Malattie Metaboliche, I.R.C.S.S. Burlo Garofolo, Trieste, Italy
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