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Correspondence to:
James S. Owen, j.owen{at}rfc.ucl.ac.uk (E-mail)
The LDL receptor (LDL-R) promotes the specific endocytosis and lysosomal delivery of extracellular lipoprotein ligands via clathrin-coated pits. It was widely assumed that other closely related members of the LDL-R gene family would have similar functions, but recent experimental evidence has revealed that one such protein, apolipoprotein E receptor 2 (apoER2), has a critical role as an "outside-in" signal transducer in the brain. ApoER2 signaling appears to require interaction between its cytoplasmic domain and adapter molecules such as Dab1, JIP 1 and JIP 2, and PSD-95. Many of the receptors for other signaling pathways affected by such adapter molecules are compartmentalized into specialized microdomains within the plasma membrane termed caveolae.
Here, we show that apoER2, but not LDL-R, is localized to caveolae, supporting the concept that its physiological role is in cell signaling, rather than in endocytosing ligands. Riddell, D. R., X-M. Sun, A. K. Stannard, A. K. Soutar, and J. S. Owen. Localization of apolipoprotein E receptor 2 to caveolae in the plasma membrane. J. Lipid Res. 2001. 42: 998;1002.
Supplementary key words:
intracellular signaling, lipid raft, LDL-R family, LRP8
Copyright © 2001 by Lipid Research, Inc.
Rapid Communication
Localization of apolipoprotein E receptor 2 to caveolae in the plasma membrane
David R. Riddella,
Xi-Ming Sunb,
Anita K. Stannarda,
Anne K. Soutarb, and
James S. Owena
a Department of Medicine, Royal Free and University College Medical School, University College London, Royal Free Campus, London NW3 2PF, United Kingdom
b Lipoprotein Group, MRC Clinical Sciences Centre, Imperial College School of Medicine, Hammersmith Hospital, Du Cane Road, London W12 0NN, United Kingdom
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