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Spiewak J, Doykov I, Papandreou A, Hällqvist J, Mills P, Clayton PT, Gissen P, Mills K, Heywood WE. New Perspectives in Dried Blood Spot Biomarkers for Lysosomal Storage Diseases. Int J Mol Sci 2023; 24:10177. [PMID: 37373322 DOI: 10.3390/ijms241210177] [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: 05/01/2023] [Revised: 06/05/2023] [Accepted: 06/09/2023] [Indexed: 06/29/2023] Open
Abstract
Dried blood spots (DBSs) biomarkers are convenient for monitoring for specific lysosomal storage diseases (LSDs), but they could have relevance for other LSDs. To determine the specificity and utility of glycosphingolipidoses biomarkers against other LSDs, we applied a multiplexed lipid liquid chromatography tandem mass spectrometry assay to a DBS cohort of healthy controls (n = 10) and Gaucher (n = 4), Fabry (n = 10), Pompe (n = 2), mucopolysaccharidosis types I-VI (n = 52), and Niemann-Pick disease type C (NPC) (n = 5) patients. We observed no complete disease specificity for any of the markers tested. However, comparison among the different LSDs highlighted new applications and perspectives of the existing biomarkers. We observed elevations in glucosylceramide isoforms in the NPC and Gaucher patients relative to the controls. In NPC, there was a greater proportion of C24 isoforms, giving a specificity of 96-97% for NPC, higher than 92% for the NPC biomarker N-palmitoyl-O-phosphocholineserine ratio to lyso-sphingomyelin. We also observed significantly elevated levels of lyso-dihexosylceramide in Gaucher and Fabry disease as well as elevated lyso-globotriaosylceramide (Lyso-Gb3) in Gaucher disease and the neuronopathic forms of Mucopolysaccharidoses. In conclusion, DBS glucosylceramide isoform profiling has increased the specificity for the detection of NPC, thereby improving diagnostic accuracy. Low levels of lyso-lipids can be observed in other LSDs, which may have implications in their disease pathogenesis.
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Affiliation(s)
- Justyna Spiewak
- Inborn Errors of Metabolism Section, Genetics & Genomic Medicine Programme, UCL Great Ormond Street Institute of Child Health, University College London, London WC1 1EH, UK
| | - Ivan Doykov
- Inborn Errors of Metabolism Section, Genetics & Genomic Medicine Programme, UCL Great Ormond Street Institute of Child Health, University College London, London WC1 1EH, UK
| | - Apostolos Papandreou
- Inborn Errors of Metabolism Section, Genetics & Genomic Medicine Programme, UCL Great Ormond Street Institute of Child Health, University College London, London WC1 1EH, UK
- Molecular Neurosciences, Developmental Neurosciences Programme, UCL Great Ormond Street Institute of Child Health, University College London, London WC1 1EH, UK
- Department of Neurology, Great Ormond Street Hospital for Children, London WC1N 3JH, UK
| | - Jenny Hällqvist
- Inborn Errors of Metabolism Section, Genetics & Genomic Medicine Programme, UCL Great Ormond Street Institute of Child Health, University College London, London WC1 1EH, UK
| | - Philippa Mills
- Inborn Errors of Metabolism Section, Genetics & Genomic Medicine Programme, UCL Great Ormond Street Institute of Child Health, University College London, London WC1 1EH, UK
| | - Peter T Clayton
- Inborn Errors of Metabolism Section, Genetics & Genomic Medicine Programme, UCL Great Ormond Street Institute of Child Health, University College London, London WC1 1EH, UK
| | - Paul Gissen
- Inborn Errors of Metabolism Section, Genetics & Genomic Medicine Programme, UCL Great Ormond Street Institute of Child Health, University College London, London WC1 1EH, UK
- Department of Metabolic Medicine, Great Ormond Street Hospital for Children, London WC1N 3JH, UK
| | - Kevin Mills
- Inborn Errors of Metabolism Section, Genetics & Genomic Medicine Programme, UCL Great Ormond Street Institute of Child Health, University College London, London WC1 1EH, UK
| | - Wendy E Heywood
- Inborn Errors of Metabolism Section, Genetics & Genomic Medicine Programme, UCL Great Ormond Street Institute of Child Health, University College London, London WC1 1EH, UK
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Prat Castro S, Kudrina V, Jaślan D, Böck J, Scotto Rosato A, Grimm C. Neurodegenerative Lysosomal Storage Disorders: TPC2 Comes to the Rescue! Cells 2022; 11:cells11182807. [PMID: 36139381 PMCID: PMC9496660 DOI: 10.3390/cells11182807] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Revised: 09/01/2022] [Accepted: 09/06/2022] [Indexed: 12/24/2022] Open
Abstract
Lysosomal storage diseases (LSDs) resulting from inherited gene mutations constitute a family of disorders that disturb lysosomal degradative function leading to abnormal storage of macromolecular substrates. In most LSDs, central nervous system (CNS) involvement is common and leads to the progressive appearance of neurodegeneration and early death. A growing amount of evidence suggests that ion channels in the endolysosomal system play a crucial role in the pathology of neurodegenerative LSDs. One of the main basic mechanisms through which the endolysosomal ion channels regulate the function of the endolysosomal system is Ca2+ release, which is thought to be essential for intracellular compartment fusion, fission, trafficking and lysosomal exocytosis. The intracellular TRPML (transient receptor potential mucolipin) and TPC (two-pore channel) ion channel families constitute the main essential Ca2+-permeable channels expressed on endolysosomal membranes, and they are considered potential drug targets for the prevention and treatment of LSDs. Although TRPML1 activation has shown rescue effects on LSD phenotypes, its activity is pH dependent, and it is blocked by sphingomyelin accumulation, which is characteristic of some LSDs. In contrast, TPC2 activation is pH-independent and not blocked by sphingomyelin, potentially representing an advantage over TRPML1. Here, we discuss the rescue of cellular phenotypes associated with LSDs such as cholesterol and lactosylceramide (LacCer) accumulation or ultrastructural changes seen by electron microscopy, mediated by the small molecule agonist of TPC2, TPC2-A1-P, which promotes lysosomal exocytosis and autophagy. In summary, new data suggest that TPC2 is a promising target for the treatment of different types of LSDs such as MLIV, NPC1, and Batten disease, both in vitro and in vivo.
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Affiliation(s)
| | | | | | | | | | - Christian Grimm
- Correspondence: (A.S.R.); (C.G.); Tel.: +49-89-2180-73811 (C.G.)
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