scholarly journals Identification of unusual oxysterols and bile acids with 7-oxo or 3β,5α,6β-trihydroxy functions in human plasma by charge-tagging mass spectrometry with multistage fragmentation

2018 ◽  
Vol 59 (6) ◽  
pp. 1058-1070 ◽  
Author(s):  
William J. Griffiths ◽  
Ian Gilmore ◽  
Eylan Yutuc ◽  
Jonas Abdel-Khalik ◽  
Peter J. Crick ◽  
...  
Keyword(s):  
Bile Acids ◽  
Ex Vivo ◽  
Hydrolysis Product ◽  
Lysosomal Storage ◽  
Inborn Errors ◽  
Niemann Pick Disease ◽  
Intermediate Metabolites ◽  
Niemann Pick ◽  
Fragmentation Patterns

7-Oxocholesterol (7-OC), 5,6-epoxycholesterol (5,6-EC), and its hydrolysis product cholestane-3β,5α,6β-triol (3β,5α,6β-triol) are normally minor oxysterols in human samples; however, in disease, their levels may be greatly elevated. This is the case in plasma from patients suffering from some lysosomal storage disorders, e.g., Niemann-Pick disease type C, or the inborn errors of sterol metabolism, e.g., Smith-Lemli-Opitz syndrome and cerebrotendinous xanthomatosis. A complication in the analysis of 7-OC and 5,6-EC is that they can also be formed ex vivo from cholesterol during sample handling in air, causing confusion with molecules formed in vivo. When formed endogenously, 7-OC, 5,6-EC, and 3β,5α,6β-triol can be converted to bile acids. Here, we describe methodology based on chemical derivatization and LC/MS with multistage fragmentation (MSn) to identify the necessary intermediates in the conversion of 7-OC to 3β-hydroxy-7-oxochol-5-enoic acid and 5,6-EC and 3β,5α,6β-triol to 3β,5α,6β-trihydroxycholanoic acid. Identification of intermediate metabolites is facilitated by their unusual MSn fragmentation patterns. Semiquantitative measurements are possible, but absolute values await the synthesis of isotope-labeled standards.

A lysosomal storage disorder in mice: A model of Niemann-Pick disease

1982 ◽  
Vol 5 (4) ◽  
pp. 239-240 ◽  
Author(s):  
T. Sakiyama ◽  
M. Tsuda ◽  
T. Kitagawa ◽  
R. Fujita ◽  
S. Miyawaki
Keyword(s):  
Lysosomal Storage Disorder ◽  
Lysosomal Storage ◽  
Niemann Pick Disease ◽  
Storage Disorder ◽  
Niemann Pick ◽  
Pick Disease

scholarly journals Invariant natural killer T cells are not affected by lysosomal storage in patients with Niemann-Pick disease type C

2012 ◽  
Vol 42 (7) ◽  
pp. 1886-1892 ◽  
Author(s):  
Anneliese O. Speak ◽  
Nicholas Platt ◽  
Mariolina Salio ◽  
Danielle te Vruchte ◽  
David A. Smith ◽  
...  
Keyword(s):  
T Cells ◽  
Natural Killer T Cells ◽  
Disease Type ◽  
Lysosomal Storage ◽  
Niemann Pick Disease ◽  
Type C ◽  
Niemann Pick ◽  
Killer T Cells ◽  
Invariant Natural Killer ◽  
Pick Disease

Acid and neutral sphingomyelinases: roles and mechanisms of regulation

2004 ◽  
Vol 82 (1) ◽  
pp. 27-44 ◽  
Author(s):  
Norma Marchesini ◽  
Yusuf A Hannun
Keyword(s):  
Nitric Oxide ◽  
Molecular Mechanisms ◽  
Caveolin 1 ◽  
Niemann Pick Disease ◽  
Extracellular Stimuli ◽  
Niemann Pick ◽  
Hydrolysis Of ◽  
Pick Disease

Ceramide, an emerging bioactive lipid and second messenger, is mainly generated by hydrolysis of sphingomyelin through the action of sphingomyelinases. At least two sphingomyelinases, neutral and acid sphingo myelinases, are activated in response to many extracellular stimuli. Despite extensive studies, the precise cellular function of each of these sphingomyelinases in sphingomyelin turnover and in the regulation of ceramide-mediated responses is not well understood. Therefore, it is essential to elucidate the factors and mechanisms that control the activation of acid and neutral sphingomyelinases to understand their the roles in cell regulation. This review will focus on the molecular mechanisms that regulate these enzymes in vivo and in vitro, especially the roles of oxidants (glu ta thi one, peroxide, nitric oxide), proteins (saposin, caveolin 1, caspases), and lipids (diacylglycerol, arachidonic acid, and ceramide).Key words: sphingomyelinase, ceramide, apoptosis, Niemann-Pick disease, FAN (factor associated with N-SMase activation).

Alveolar lipoproteinosis in an acid sphingomyelinase-deficient mouse model of Niemann-Pick disease

2003 ◽  
Vol 284 (3) ◽  
pp. L518-L525 ◽  
Author(s):  
Machiko Ikegami ◽  
Rajwinder Dhami ◽  
Edward H. Schuchman
Keyword(s):  
Alveolar Macrophages ◽  
Pulmonary Inflammation ◽  
Acid Sphingomyelinase ◽  
Deficient Mouse ◽  
Niemann Pick Disease ◽  
Surfactant Inhibition ◽  
Niemann Pick ◽  
Surfactant Composition ◽  
Pick Disease

Types A and B Niemann-Pick disease (NPD) are lipid storage disorders caused by the deficient activity of acid sphingomyelinase (ASM). In humans, NPD is associated with the dysfunction of numerous organs including the lung. Gene targeting of the ASM gene in transgenic mice produced an animal model with features typical of NPD, including pulmonary inflammation. To assess mechanisms by which ASM perturbed lung function, we studied lung morphology, surfactant content, and metabolism in ASM-deficient mice in vivo. Pulmonary inflammation, with increased cellular infiltrates and the accumulation of alveolar material, was associated with alterations in surfactant content. Saturated phosphatidylcholine (SatPC) content was increased twofold, and sphingomyelin content was increased 5.5-fold in lungs of the ASM knockout (ASMKO) mice. Additional sphingomyelin enhanced the sensitivity of surfactant inhibition by plasma proteins. Clearance of SatPC from the lungs of ASMKO mice was decreased. Catabolism of SatPC by alveolar macrophages from the ASMKO mouse was significantly decreased, likely accounting for decreased pulmonary SatPC in vivo. In summary, ASM is required for normal surfactant catabolism by alveolar macrophages in vivo. Alterations in surfactant composition, including increased sphingomyelin content, contributed to the abnormal surfactant function observed in the ASM-deficient mouse.

scholarly journals Expanded access with intravenous hydroxypropyl-β-cyclodextrin to treat children and young adults with Niemann-Pick disease type C1: a case report analysis

2019 ◽  
Vol 14 (1) ◽  
Author(s):  
Caroline Hastings ◽  
Camilo Vieira ◽  
Benny Liu ◽  
Cyrus Bascon ◽  
Claire Gao ◽  
...  
Keyword(s):  
Disease Type ◽  
Lysosomal Storage ◽  
Safety Issues ◽  
Expanded Access ◽  
Niemann Pick Disease ◽  
The Us ◽  
Progression Of Disease ◽  
Report Analysis ◽  
Niemann Pick ◽  
Pick Disease

Abstract Background Niemann-Pick Disease Type C (NPC) is an inherited, often fatal neurovisceral lysosomal storage disease characterized by cholesterol accumulation in every cell with few known treatments. Defects in cholesterol transport cause sequestration of unesterified cholesterol within the endolysosomal system. The discovery that systemic administration of hydroxypropyl-beta cyclodextrin (HPβPD) to NPC mice could release trapped cholesterol from lysosomes, normalize cholesterol levels in the liver, and prolong life, led to expanded access use in NPC patients. HPβCD has been administered to NPC patients with approved INDs globally since 2009. Results Here we present safety, tolerability and efficacy data from 12 patients treated intravenously (IV) for over 7 years with HPβCD in the US and Brazil. Some patients subsequently received intrathecal (IT) treatment with HPβCD following on average 13 months of IV HPβCD. Several patients transitioned to an alternate HPβCD. Moderately affected NPC patients treated with HPβCD showed slowing of disease progression. Severely affected patients demonstrated periods of stability but eventually showed progression of disease. Neurologic and neurocognitive benefits were seen in most patients with IV alone, independent of the addition of IT administration. Physicians and caregivers reported improvements in quality of life for the patients on IV therapy. There were no safety issues, and the drug was well tolerated and easy to administer. Conclusions These expanded access data support the safety and potential benefit of systemic IV administration of HPβCD and provide a platform for two clinical trials to study the effect of intravenous administration of HPβCD in NPC patients.

scholarly journals Human iNSC-derived brain organoid model of lysosomal storage disorder in Niemann–Pick disease type C

2020 ◽  
Vol 11 (12) ◽  
Author(s):  
Seung-Eun Lee ◽  
Nari Shin ◽  
Myung Geun Kook ◽  
Dasom Kong ◽  
Nam Gyo Kim ◽  
...  
Keyword(s):  
Stem Cells ◽  
Lysosomal Storage Disorder ◽  
Disease Type ◽  
Lysosomal Storage ◽  
Niemann Pick Disease ◽  
Type C ◽  
Storage Disorder ◽  
Niemann Pick ◽  
Pick Disease

AbstractRecent studies on developing three-dimensional (3D) brain organoids from stem cells have allowed the generation of in vitro models of neural disease and have enabled the screening of drugs because these organoids mimic the complexity of neural tissue. Niemann-Pick disease, type C (NPC) is a neurodegenerative lysosomal storage disorder caused by mutations in the NPC1 or NPC2. The pathological features underlying NPC are characterized by the abnormal accumulation of cholesterol in acidic compartments, including late endosomes and lysosomes. Due to the inaccessibility of brain tissues from human NPC patients, we developed NPC brain organoids with induced neural stem cells from NPC patient-derived fibroblasts. NPC organoids exhibit significantly reduced size and proliferative ability, which are accompanied by accumulation of cholesterol, impairment in neuronal differentiation, and autophagic flux and dysfunction of lysosomes; therefore, NPC organoids can recapitulate the main phenotypes of NPC patients. Furthermore, these pathological phenotypes observed in NPC organoids were reversed by treatment with valproic acid and HPBCD, which are known to be an effective treatment for several neurodegenerative diseases. Our data present patient-specific phenotypes in 3D organoid-based models of NPC and highlight the application of this model to drug screening in vitro.

Optical non-invasive detection of Niemann-Pick disease in vitro and in vivo

2017 ◽  
Vol 120 (1-2) ◽  
pp. S71
Author(s):  
Prakrit V. Jena ◽  
Thomas V. Galassi ◽  
Daniel Roxbury ◽  
Robert E. Schwartz ◽  
Frederick R. Maxfield ◽  
...  
Keyword(s):  
Non Invasive ◽  
Niemann Pick Disease ◽  
Niemann Pick ◽  
Pick Disease

scholarly journals Listeria monocytogenes MenI Encodes a DHNA-CoA Thioesterase Necessary for Menaquinone Biosynthesis, Cytosolic Survival, and Virulence

2021 ◽  
Vol 89 (5) ◽  
Author(s):  
Hans B. Smith ◽  
Tin Lok Li ◽  
Man Kit Liao ◽  
Grischa Y. Chen ◽  
Zhihong Guo ◽  
...  
Keyword(s):  
Listeria Monocytogenes ◽  
Ex Vivo ◽  
Strong Activity ◽  
Content Type ◽  
Transport Chain ◽  
Intermediate Metabolites ◽  
Bacterial Replication ◽  
Functional Analyses

ABSTRACT Listeria monocytogenes is a Gram-positive, intracellular pathogen that is highly adapted to invade and replicate in the cytosol of eukaryotic cells. Intermediate metabolites in the menaquinone biosynthesis pathway are essential for the cytosolic survival and virulence of L. monocytogenes, independent of the production of menaquinone (MK) and aerobic respiration. Determining which specific intermediate metabolite(s) are essential for cytosolic survival and virulence has been hindered by the lack of an identified 1,4-dihydroxy-2-naphthoyl-coenzyme A (DHNA-CoA) thioesterase essential for converting DHNA-CoA to DHNA in the MK synthesis pathway. Using the recently identified Escherichia coli DHNA-CoA thioesterase as a query, homology sequence analysis revealed a single homolog in L. monocytogenes, LMRG_02730. Genetic deletion of LMRG_02730 resulted in an ablated membrane potential, indicative of a nonfunctional electron transport chain (ETC) and an inability to aerobically respire. Biochemical kinetic analysis of LMRG_02730 revealed strong activity toward DHNA-CoA, similar to its E. coli homolog, further demonstrating that LMRG_02730 is a DHNA-CoA thioesterase. Functional analyses in vitro, ex vivo, and in vivo using mutants directly downstream and upstream of LMRG_02730 revealed that DHNA-CoA is sufficient to facilitate in vitro growth in minimal medium, intracellular replication, and plaque formation in fibroblasts. In contrast, protection against bacteriolysis in the cytosol of macrophages and tissue-specific virulence in vivo requires the production of 1,4-dihydroxy-2-naphthoate (DHNA). Taken together, these data implicate LMRG_02730 (renamed MenI) as a DHNA-CoA thioesterase and suggest that while DHNA, or an unknown downstream product of DHNA, protects the bacteria from killing in the macrophage cytosol, DHNA-CoA is necessary for intracellular bacterial replication.

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