Low-density lipoprotein receptor family (LDLR family)

The **Low-density lipoprotein receptor family** (often called apoE receptors) is a group of structurally related cell-surface receptors that bind apolipoprotein E (ApoE) and mediate endocytosis of various lipoprotein particles[5][3][7]. The most prominent member, the LDL receptor (LDLR), is critical for the clearance of cholesterol-rich lipoproteins in the liver and other tissues[5]. Family members, such as LDLR, LRP1 (low-density lipoprotein receptor-related protein 1), VLDLR (very-low-density lipoprotein receptor), and ApoER2 (LRP8), share structural motifs and overlapping ligand preferences[5]. ApoE-containing lipoproteins bind these receptors, which triggers endocytosis and delivery of lipids to cells, particularly hepatocytes and neurons[3][5][7]. In the central nervous system, these receptors are crucial for cholesterol transport from astrocytes to neurons, influencing synaptic function, neurodevelopment, and risk of neurodegenerative diseases such as Alzheimer’s disease[5][2][3]. Genetic variants or mutations affecting ApoE or its receptors can lead to lipid metabolism disorders, including familial hypercholesterolemia and type III hyperlipoproteinemia[3]. Receptor function is also involved in cardiovascular risk, and is a major target (directly or indirectly) of common lipid-lowering strategies such as statins and PCSK9 inhibitors. Ongoing research implicates these receptors in additional biological processes, such as immune regulation and brain repair mechanisms[5][7].

Other names

ApoE receptor familyLDL receptor familyLow-density lipoprotein receptor familyLipoprotein receptor familyLDLR familyLDLR, LRP1, VLDLR, ApoER2 (members)

Promote hepatic uptake of ApoE-containing lipoproteins by endocytosis - Modulation of receptor-ligand interactions for cholesterol clearance - Intracellular signaling affecting lipid and neuronal homeostasis- Some drugs increase receptor expression or function (e.g., statins, PCSK9 inhibitors), enhancing lipoprotein clearance