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The GARP Complex Is Involved in Intracellular Cholesterol Transport via Targeting NPC2 to Lysosomes

Authors: Jian Wei; Ying-Yu Zhang; Jie Luo; Ju-Qiong Wang; Yu-Xia Zhou; Hong-Hua Miao; Xiong-Jie Shi; +4 Authors

The GARP Complex Is Involved in Intracellular Cholesterol Transport via Targeting NPC2 to Lysosomes

Abstract

Proper intracellular cholesterol trafficking is critical for cellular function. Two lysosome-resident proteins, NPC1 and NPC2, mediate the egress of low-density lipoprotein-derived cholesterol from lysosomes. However, other proteins involved in this process remain largely unknown. Through amphotericin B-based selection, we isolated two cholesterol transport-defective cell lines. Subsequent whole-transcriptome-sequencing analysis revealed two cell lines bearing the same mutation in the vacuolar protein sorting 53 (Vps53) gene. Depletion of VPS53 or other subunits of the Golgi-associated retrograde protein (GARP) complex impaired NPC2 sorting to lysosomes and caused cholesterol accumulation. GARP deficiency blocked the retrieval of the cation-independent mannose 6-phosphate receptor (CI-MPR) to the trans-Golgi network. Further, Vps54 mutant mice displayed reduced cellular NPC2 protein levels and increased cholesterol accumulation, underscoring the physiological role of the GARP complex in cholesterol transport. We conclude that the GARP complex contributes to intracellular cholesterol transport by targeting NPC2 to lysosomes in a CI-MPR-dependent manner.

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Keywords

VPS53, intracellular cholesterol transport, QH301-705.5, Vesicular Transport Proteins, NPC1/2, vacuolar protein sorting 53, cation-independent mannose 6-phosphate receptor, Mice, GARP, Animals, Humans, Biology (General), Golgi-associated retrograde protein complex, trans-Golgi network, Membrane Proteins, Biological Transport, Niemann-Pick Type C disease, retrograde transport, Cholesterol, TGN, lysosome, CI-MPR, NPC, Lysosomes

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    influence
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
46
Top 10%
Top 10%
Top 10%
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