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Cholesterol sensing, trafficking, and esterification.

Ta-Yuan Chang1, Catherine C Y Chang, Nobutaka Ohgami

  • 1Department of Biochemistry, Dartmouth Medical School, Hanover, New Hampshire 03755, USA. ta.yuan.chang@dartmouth.edu

Annual Review of Cell and Developmental Biology
|June 7, 2006
PubMed
Summary
This summary is machine-generated.

Mammalian cells manage cholesterol from LDL and internal synthesis. The Niemann-Pick type C1 protein (NPC1) is key for cholesterol transport, with excess cholesterol regulated by ACAT1 and cellular efflux.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Mammalian cells obtain cholesterol from both low-density lipoprotein (LDL) uptake and endogenous synthesis.
  • Cellular cholesterol homeostasis is crucial for membrane integrity and signaling pathways.
  • Dysregulation of cholesterol metabolism is implicated in various diseases.

Purpose of the Study:

  • To discuss the roles of the Niemann-Pick type C1 protein (NPC1) in cholesterol transport.
  • To explore the mechanisms of cellular cholesterol regulation, including esterification and efflux.
  • To summarize the functions of sterol-sensing domains (SSDs) and related proteins in cholesterol metabolism.

Main Methods:

  • Literature review and discussion of existing research on cholesterol transport and metabolism.
  • Analysis of the functions of key proteins involved in cholesterol handling, such as NPC1, ACAT1, START domain proteins, and oxysterol binding protein-related proteins (ORPs).
  • Examination of the structural and functional properties of sterol-sensing domains (SSDs).

Main Results:

  • NPC1 plays a significant role in mediating the endosomal transport of both LDL-derived and endogenously synthesized cholesterol.
  • Excess cellular cholesterol is managed through conversion to cholesteryl esters by acyl-coenzyme A:cholesterol acyltransferase 1 (ACAT1) or via cellular cholesterol efflux.
  • A close functional relationship is proposed between the ACAT substrate pool and the cholesterol efflux pool.
  • Sterol-sensing domains (SSDs) are identified in critical membrane proteins involved in cholesterol regulation.
  • ACAT1 functions as an endoplasmic reticulum cholesterol sensor.
  • Nonvesicular cholesterol transport involves START domain proteins and ORPs.

Conclusions:

  • NPC1 is a central player in intracellular cholesterol trafficking.
  • ACAT1 and cellular efflux represent key pathways for managing cholesterol overload.
  • Proteins with SSDs are integral to sensing and regulating cellular cholesterol levels.
  • START proteins and ORPs are important for nonvesicular cholesterol movement.