Defective platelet function in Niemann‐Pick disease type C1

Niemann‐Pick disease type C (NPC) is a neurodegenerative lysosomal storage disorder caused by mutations in either NPC1 (95% of cases) or NPC2. Reduced late endosome/lysosome calcium (Ca2+) levels and the accumulation of unesterified cholesterol and sphingolipids within the late endocytic system char...

Full description

Saved in:
Bibliographic Details
Published in:JIMD reports 2020-11, Vol.56 (1), p.46-57
Main Authors: Chen, Oscar C. W., Colaco, Alexandria, Davis, Lianne C., Kiskin, Fedir N., Farhat, Nicole Y., Speak, Anneliese O., Smith, David A., Morris, Lauren, Eden, Emily, Tynan, Patricia, Churchill, Grant C., Galione, Antony, Porter, Forbes D., Platt, Frances M.
Format: Article
Language:English
Subjects:
Acids
Blood platelets
Brain diseases
calcium (Ca2+)
Defects
Genetic disorders
Hematology
lysosome
lysosome‐related organelle
Metabolic disorders
Microscopy
Niemann‐Pick disease type C
Research Report
Research Reports
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Niemann‐Pick disease type C (NPC) is a neurodegenerative lysosomal storage disorder caused by mutations in either NPC1 (95% of cases) or NPC2. Reduced late endosome/lysosome calcium (Ca2+) levels and the accumulation of unesterified cholesterol and sphingolipids within the late endocytic system characterize this disease. We previously reported impaired lysosome‐related organelle (LRO) function in Npc1−/− Natural Killer cells; however, the potential contribution of impaired acid compartment Ca2+ flux and LRO function in other cell types has not been determined. Here, we investigated LRO function in NPC1 disease platelets. We found elevated numbers of circulating platelets, impaired platelet aggregation and prolonged bleeding times in a murine model of NPC1 disease. Electron microscopy revealed abnormal ultrastructure in murine platelets, consistent with that seen in a U18666A (pharmacological inhibitor of NPC1) treated megakaryocyte cell line (MEG‐01) exhibiting lipid storage and acidic compartment Ca2+ flux defects. Furthermore, platelets from NPC1 patients across different ages were found to cluster at the lower end of the normal range when platelet numbers were measured and had platelet volumes that were clustered at the top of the normal range. Taken together, these findings highlight the role of acid compartment Ca2+ flux in the function of platelet LROs.
ISSN:2192-8312
2192-8304
2192-8312
DOI:10.1002/jmd2.12148