Abstract
Cholesterol is the single most abundant lipid species in mammalian cells. More than 2×109 years of evolution designed this molecule to perfectly fit into phospholipid bilayers regulating the fluidity, permeability and bending stiffness of biological membranes. Cholesterol also serves as a precursor of steroid hormones, bile acids and oxysterols, and its cellular synthesis is regulated by a complex machinery. While the molecular mechanisms underlying cholesterol synthesis are known in great detail, knowledge is rather sparse about the inter-compartment transport of cholesterol, including trafficking modes and kinetics, as well as control of endomembrane cholesterol content. This chapter provides an overview of our recent understanding of intracellular transport of cholesterol. It is aimed to create a link between the well characterized biophysical properties of cholesterol in model membranes and its behavior in living cells.
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