Lipid Transport Mechanisms in Hepatic Systems
Summary
The liver orchestrates a complex network of lipid transport processes that maintain systemic energy balance and membrane lipid homeostasis. Circulating non-esterified fatty acids are taken up by hepatocytes via membrane transporters and immediately sequestered by cytosolic fatty acid-binding proteins to prevent detergent-like disruption of intracellular membranes. These proteins channel long-chain fatty acids towards β-oxidation pathways in mitochondria and peroxisomes or divert them into biosynthetic routes for triglyceride and phospholipid assembly. Sterol carrier proteins facilitate the intracellular trafficking of cholesterol and sterol intermediates between organelles, supporting bile acid synthesis in peroxisomes and lipid export via very low-density lipoprotein (VLDL) particles assembled at the endoplasmic reticulum. Hepatic lipid export through VLDL is finely tuned by nuclear receptors that sense fatty acid and sterol ligands, thus integrating nutrient status with gene programmes for lipid oxidation, lipogenesis and lipoprotein secretion. Dysregulation of these transport mechanisms underlies common disorders including non-alcoholic fatty liver disease, gallstone disease and dyslipidaemia. Recent advances in structural biology and gene-knockout models have illuminated the molecular interfaces between lipid-binding proteins and their lipid cargos, paving the way for targeted modulation of hepatic lipid handling in metabolic and cholestatic liver diseases.
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Lipid Transport Mechanisms in Hepatic Systems publication trend
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Technical terms
L-FABP: A cytosolic protein that binds long-chain fatty acids, directing them to metabolic or storage pathways.
SCP-2: A nonspecific sterol carrier protein that shuttles cholesterol and related lipids between intracellular membranes.
Peroxisomal β-oxidation: A pathway in peroxisomes that shortens very long-chain and branched-chain fatty acids, supplying substrates for bile acid synthesis.
VLDL: Very low-density lipoprotein particles assembled by hepatocytes to export triglycerides and cholesterol esters into the circulation.
PPARα: A nuclear receptor activated by fatty acids that regulates genes involved in lipid oxidation and transport.
Bile acid: Amphipathic molecules derived from cholesterol that facilitate dietary lipid absorption and regulate cholesterol homeostasis.
References
- Association of a Human FABP1 Gene Promoter Region Polymorphism with Altered Serum Triglyceride Levels. PLOS ONE (2015).
- Overexpression of sterol carrier protein-2 differentially alters hepatic cholesterol accumulation in cholesterol-fed mice. Journal of Lipid Research (2009).
- Increased susceptibility to diet-induced gallstones in liver fatty acid binding protein knockout mice [S]. Journal of Lipid Research (2009).
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