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Pubmed ID :11907140
Publication Date : //

Niemann-Pick C1 protein regulates cholesterol transport to the trans-Golgi network and plasma membrane caveolae.


The Niemann-Pick C1 (NPC1) protein regulates cholesterol transport from late endosomes-lysosomes to other intracellular compartments. In this article, cholesterol transport to caveolin-1 and caveolin-2 containing compartments, such as the trans-Golgi network (TGN) and plasma membrane caveolae, was examined in normal (NPC+/+), NPC heterozygous (NPC+/-), and NPC homozygous (NPC-/-) human fibroblasts. The expression and distribution of NPC1 in each cell type were similar, and characterized by a finely dispersed, granular staining pattern. The expression of caveolin-1 and caveolin-2 was increased in NPC+/- and NPC-/- fibroblasts, although the distribution in each cell type was similar and characterized by predominant staining of the TGN and plasma membrane. The TGN in NPC+/+ fibroblasts was relatively cholesterol-enriched, whereas the TGN in NPC+/- and NPC-/- fibroblasts was partially or completely cholesterol-deficient, respectively. Consistent with studies demonstrating the transport of cholesterol from the TGN to plasma membrane caveolae, the concentration of cholesterol in plasma membrane caveolae isolated from NPC+/- and NPC-/- fibroblasts was significantly decreased, even though the total concentration of plasma membrane cholesterol in each cell type was similar. These studies demonstrate that NPC1 regulates cholesterol transport to caveolin-1 and caveolin-2 containing compartments such as the TGN and plasma membrane caveolae.

Authors : Garver William S , Krishnan Kumar , Gallagos Jayme R , Michikawa Makoto , Francis Gordon A , Heidenreich Randall A ,

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