ZFIN ID: ZDB-PUB-110602-8
Requirement of Npc1 and availability of cholesterol for early embryonic cell movements in Zebrafish
Schwend, T., Loucks, E.J., Snyder, D., and Ahlgren, S.C.
Date: 2011
Source: Journal of Lipid Research 52(7): 1328-44 (Journal)
Registered Authors: Ahlgren, Sara, Loucks, Evyn
Keywords: none
MeSH Terms: Actins/metabolism; Amino Acid Sequence; Animals; Biological Transport/drug effects; Biological Transport/genetics (all 42) expand
PubMed: 21576600 Full text @ J. Lipid Res.
FIGURES   (current status)
ABSTRACT
Niemann-Pick type C disease (NP-C), often associated with Niemann-Pick disease, type C1 (NPC1) mutations, is a cholesterol-storage disorder characterized by cellular lipid accumulation, neurodegeneration, and reduced steroid production. To study NPC1 function in vivo, we cloned zebrafish npc1, and analyzed its gene expression and activity by reducing Npc1 protein with morpholino-oligonucleotides. Filipin staining in npc1-morphant cells was punctate, suggesting abnormal accumulation of cholesterol. Developmentally, reducing Npc1 did not disrupt early cell fate or survival; however, early morphogenetic movements were delayed, and the actin cytoskeleton network was abnormal. Morpholino-induced defects were rescued with ectopic expression of mouse NPC1, demonstrating functional gene conservation, and by treatments with steroids pregnenolone or dexamethasone, suggesting that reduced steroidogenesis contributed to abnormal cell movements. Cell death was found in anterior tissues of npc1-morphants at later stages, consistent with findings in mammals. Our studies show that npc1 is required early for proper cell movements and cholesterol localization and later for cell survival.
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