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Understanding and Treating Niemann-Pick Type C Disease: Models Matter. Int J Mol Sci 2020; 21:ijms21238979. [PMID: 33256121 PMCID: PMC7730076 DOI: 10.3390/ijms21238979] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 11/20/2020] [Accepted: 11/23/2020] [Indexed: 02/06/2023] Open
Abstract
Biomedical research aims to understand the molecular mechanisms causing human diseases and to develop curative therapies. So far, these goals have been achieved for a small fraction of diseases, limiting factors being the availability, validity, and use of experimental models. Niemann–Pick type C (NPC) is a prime example for a disease that lacks a curative therapy despite substantial breakthroughs. This rare, fatal, and autosomal-recessive disorder is caused by defects in NPC1 or NPC2. These ubiquitously expressed proteins help cholesterol exit from the endosomal–lysosomal system. The dysfunction of either causes an aberrant accumulation of lipids with patients presenting a large range of disease onset, neurovisceral symptoms, and life span. Here, we note general aspects of experimental models, we describe the line-up used for NPC-related research and therapy development, and we provide an outlook on future topics.
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Gläser A, Hammerl F, Gräler MH, Coldewey SM, Völkner C, Frech MJ, Yang F, Luo J, Tönnies E, von Bohlen und Halbach O, Brandt N, Heimes D, Neßlauer AM, Korenke GC, Owczarek-Lipska M, Neidhardt J, Rolfs A, Wree A, Witt M, Bräuer AU. Identification of Brain-Specific Treatment Effects in NPC1 Disease by Focusing on Cellular and Molecular Changes of Sphingosine-1-Phosphate Metabolism. Int J Mol Sci 2020; 21:ijms21124502. [PMID: 32599915 PMCID: PMC7352403 DOI: 10.3390/ijms21124502] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 06/19/2020] [Accepted: 06/21/2020] [Indexed: 12/17/2022] Open
Abstract
Niemann-Pick type C1 (NPC1) is a lysosomal storage disorder, inherited as an autosomal-recessive trait. Mutations in the Npc1 gene result in malfunction of the NPC1 protein, leading to an accumulation of unesterified cholesterol and glycosphingolipids. Beside visceral symptoms like hepatosplenomegaly, severe neurological symptoms such as ataxia occur. Here, we analyzed the sphingosine-1-phosphate (S1P)/S1P receptor (S1PR) axis in different brain regions of Npc1-/- mice and evaluated specific effects of treatment with 2-hydroxypropyl-β-cyclodextrin (HPβCD) together with the iminosugar miglustat. Using high-performance thin-layer chromatography (HPTLC), mass spectrometry, quantitative real-time PCR (qRT-PCR) and western blot analyses, we studied lipid metabolism in an NPC1 mouse model and human skin fibroblasts. Lipid analyses showed disrupted S1P metabolism in Npc1-/- mice in all brain regions, together with distinct changes in S1pr3/S1PR3 and S1pr5/S1PR5 expression. Brains of Npc1-/- mice showed only weak treatment effects. However, side effects of the treatment were observed in Npc1+/+ mice. The S1P/S1PR axis seems to be involved in NPC1 pathology, showing only weak treatment effects in mouse brain. S1pr expression appears to be affected in human fibroblasts, induced pluripotent stem cells (iPSCs)-derived neural progenitor and neuronal differentiated cells. Nevertheless, treatment-induced side effects make examination of further treatment strategies indispensable.
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Affiliation(s)
- Anne Gläser
- Research Group Anatomy, School of Medicine and Health Sciences, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany; (A.G.); (F.H.); (N.B.)
- Institute of Anatomy, Rostock University Medical Center, 18057 Rostock, Germany; (D.H.); (A.-M.N.); (A.W.); (M.W.)
| | - Franziska Hammerl
- Research Group Anatomy, School of Medicine and Health Sciences, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany; (A.G.); (F.H.); (N.B.)
| | - Markus H. Gräler
- Department of Anaesthesiology and Intensive Care Medicine, Center for Sepsis Control and Care (CSCC), Center for Molecular Biomedicine (CMB), Jena University Hospital, 07745 Jena, Germany;
| | - Sina M. Coldewey
- Department of Anaesthesiology and Intensive Care Medicine, Septomics Research Center, Center for Sepsis Control and Care, Jena University Hospital, 07747 Jena, Germany;
| | - Christin Völkner
- Translational Neurodegeneration Section “Albrecht Kossel”, Department of Neurology, University Medical Center Rostock, University of Rostock, 18147 Rostock, Germany; (C.V.); (M.J.F.); (F.Y.); (J.L.)
| | - Moritz J. Frech
- Translational Neurodegeneration Section “Albrecht Kossel”, Department of Neurology, University Medical Center Rostock, University of Rostock, 18147 Rostock, Germany; (C.V.); (M.J.F.); (F.Y.); (J.L.)
- Center for Transdisciplinary Neurosciences Rostock (CTNR), Rostock University Medical Center, University of Rostock, 18147 Rostock, Germany
| | - Fan Yang
- Translational Neurodegeneration Section “Albrecht Kossel”, Department of Neurology, University Medical Center Rostock, University of Rostock, 18147 Rostock, Germany; (C.V.); (M.J.F.); (F.Y.); (J.L.)
| | - Jiankai Luo
- Translational Neurodegeneration Section “Albrecht Kossel”, Department of Neurology, University Medical Center Rostock, University of Rostock, 18147 Rostock, Germany; (C.V.); (M.J.F.); (F.Y.); (J.L.)
- Center for Transdisciplinary Neurosciences Rostock (CTNR), Rostock University Medical Center, University of Rostock, 18147 Rostock, Germany
| | - Eric Tönnies
- Institute of Anatomy and Cell Biology, University Medicine Greifswald, 17487 Greifswald, Germany; (E.T.); (O.v.B.u.H.)
| | - Oliver von Bohlen und Halbach
- Institute of Anatomy and Cell Biology, University Medicine Greifswald, 17487 Greifswald, Germany; (E.T.); (O.v.B.u.H.)
| | - Nicola Brandt
- Research Group Anatomy, School of Medicine and Health Sciences, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany; (A.G.); (F.H.); (N.B.)
| | - Diana Heimes
- Institute of Anatomy, Rostock University Medical Center, 18057 Rostock, Germany; (D.H.); (A.-M.N.); (A.W.); (M.W.)
| | - Anna-Maria Neßlauer
- Institute of Anatomy, Rostock University Medical Center, 18057 Rostock, Germany; (D.H.); (A.-M.N.); (A.W.); (M.W.)
| | | | - Marta Owczarek-Lipska
- Human Genetics, School of Medicine and Health Sciences, University of Oldenburg, 26129 Oldenburg, Germany; (M.O.-L.); (J.N.)
- Junior Research Group, Genetics of childhood brain malformations, School of Medicine and Health Sciences, University of Oldenburg, 26129 Oldenburg, Germany
| | - John Neidhardt
- Human Genetics, School of Medicine and Health Sciences, University of Oldenburg, 26129 Oldenburg, Germany; (M.O.-L.); (J.N.)
- Research Center for Neurosensory Science, Carl von Ossietzky University Oldenburg,26129 Oldenburg, Germany
| | | | - Andreas Wree
- Institute of Anatomy, Rostock University Medical Center, 18057 Rostock, Germany; (D.H.); (A.-M.N.); (A.W.); (M.W.)
| | - Martin Witt
- Institute of Anatomy, Rostock University Medical Center, 18057 Rostock, Germany; (D.H.); (A.-M.N.); (A.W.); (M.W.)
| | - Anja Ursula Bräuer
- Research Group Anatomy, School of Medicine and Health Sciences, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany; (A.G.); (F.H.); (N.B.)
- Institute of Anatomy, Rostock University Medical Center, 18057 Rostock, Germany; (D.H.); (A.-M.N.); (A.W.); (M.W.)
- Research Center for Neurosensory Science, Carl von Ossietzky University Oldenburg,26129 Oldenburg, Germany
- Correspondence: ; Tel.: +49-441-798-3995
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Wang Y, Thinakaran G, Kar S. Overexpression of the IGF-II/M6P receptor in mouse fibroblast cell lines differentially alters expression profiles of genes involved in Alzheimer's disease-related pathology. PLoS One 2014; 9:e98057. [PMID: 24846272 PMCID: PMC4028253 DOI: 10.1371/journal.pone.0098057] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2014] [Accepted: 04/25/2014] [Indexed: 11/29/2022] Open
Abstract
Alzheimer’s disease (AD) is the most common type of senile dementia affecting elderly people. The processing of amyloid precursor protein (APP) leading to the generation of β-amyloid (Aβ) peptide contributes to neurodegeneration and development of AD pathology. The endocytic trafficking pathway, which comprises of the endosomes and lysosomes, acts as an important site for Aβ generation, and endocytic dysfunction has been linked to increased Aβ production and loss of neurons in AD brains. Since insulin-like growth factor-II (IGF-II) receptor plays a critical role in the transport of lysosomal enzymes from the trans-Golgi network to endosomes, it is likely that the receptor may have a role in regulating Aβ metabolism in AD pathology. However, very little is known on how altered levels of the IGF-II receptor can influence the expression/function of various molecules involved in AD pathology. To address this issue, we evaluated the expression profiles of 87 selected genes related to AD pathology in mouse fibroblast MS cells that are deficient in murine IGF-II receptor and corresponding MS9II cells overexpressing ∼500 times the human IGF-II receptors. Our results reveal that an elevation in IGF-II receptor levels alters the expression profiles of a number of genes including APP as well as enzymes regulating Aβ production, degradation and clearance mechanisms. Additionally, it influences the expression of various lysosomal enzymes and protein kinases that are involved in Aβ toxicity. IGF-II receptor overexpression also alters expression of several genes involved in intracellular signalling as well as cholesterol metabolism, which play a critical role in AD pathology. The altered gene profiles observed in this study closely match with the corresponding protein levels, with a few exceptions. These results, taken together, suggest that an elevation in IGF-II receptor levels can influence the expression profiles of transcripts as well as proteins that are involved in AD pathogenesis.
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Affiliation(s)
- Yanlin Wang
- Department of Psychiatry, University of Alberta, Edmonton, Alberta, Canada
- Centre for Prions and Protein Folding Diseases, University of Alberta, Edmonton, Alberta, Canada
| | - Gopal Thinakaran
- Departments of Neurobiology, Neurology and Pathology, The University of Chicago, Chicago, Illinois, United States of America
| | - Satyabrata Kar
- Department of Psychiatry, University of Alberta, Edmonton, Alberta, Canada
- Centre for Prions and Protein Folding Diseases, University of Alberta, Edmonton, Alberta, Canada
- Department of Medicine (Neurology), University of Alberta, Edmonton, Alberta, Canada
- * E-mail:
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