Oxidised LDL internalisation by the LOX-1 scavenger receptor is dependent on a novel cytoplasmic motif and is regulated by dynamin-2
doi: 10.1242/jcs.020917
pmid: 18544637
Oxidised LDL internalisation by the LOX-1 scavenger receptor is dependent on a novel cytoplasmic motif and is regulated by dynamin-2
The LOX-1 scavenger receptor recognises pro-atherogenic oxidised low-density lipoprotein (OxLDL) particles and is implicated in atherosclerotic plaque formation, but this mechanism is not well understood. Here we show evidence for a novel clathrin-independent and cytosolic-signal-dependent pathway that regulates LOX-1-mediated OxLDL internalisation. Cell surface labelling in the absence or presence of OxLDL ligand showed that LOX-1 is constitutively internalised from the plasma membrane and its half-life is not altered upon ligand binding and trafficking. We show that LOX-1-mediated OxLDL uptake is disrupted by overexpression of dominant-negative dynamin-2 but unaffected by CHC17 or μ2 (AP2) depletion. Site-directed mutagenesis revealed a conserved and novel cytoplasmic tripeptide motif (DDL) that regulates LOX-1-mediated endocytosis of OxLDL. Taken together, these findings indicate that LOX-1 is internalised by a clathrin-independent and dynamin-2-dependent pathway and is thus likely to mediate OxLDL trafficking in vascular tissues.
- University of Leeds United Kingdom
- University of Oxford United Kingdom
- Wellcome Centre for Human Genetics United Kingdom
Amino Acid Motifs, Molecular Sequence Data, Scavenger Receptors, Class E, Endocytosis, Protein Structure, Tertiary, Lipoproteins, LDL, Dynamin II, Protein Transport, Mutagenesis, Site-Directed, Humans, Amino Acid Sequence, HeLa Cells, Protein Binding, Signal Transduction
Amino Acid Motifs, Molecular Sequence Data, Scavenger Receptors, Class E, Endocytosis, Protein Structure, Tertiary, Lipoproteins, LDL, Dynamin II, Protein Transport, Mutagenesis, Site-Directed, Humans, Amino Acid Sequence, HeLa Cells, Protein Binding, Signal Transduction
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