Sorting nexin 17 accelerates internalization yet retards degradation of P-selectin

R Williams, T Schluter, MS Roberts… - Molecular biology of …, 2004 - Am Soc Cell Biol
R Williams, T Schluter, MS Roberts, P Knauth, R Bohnensack, DF Cutler
Molecular biology of the cell, 2004Am Soc Cell Biol
The transient appearance of P-selectin on the surface of endothelial cells helps recruit
leukocytes into sites of inflammation. The tight control of cell surface P-selectin on these
cells depends on regulated exocytosis of Weibel-Palade bodies where the protein is stored
and on its rapid endocytosis. After endocytosis, P-selectin is either sorted via endosomes
and the Golgi apparatus for storage in Weibel-Palade bodies or targeted to lysosomes for
degradation. A potential player in this complex endocytic itinerary is SNX17, a member of …
The transient appearance of P-selectin on the surface of endothelial cells helps recruit leukocytes into sites of inflammation. The tight control of cell surface P-selectin on these cells depends on regulated exocytosis of Weibel-Palade bodies where the protein is stored and on its rapid endocytosis. After endocytosis, P-selectin is either sorted via endosomes and the Golgi apparatus for storage in Weibel-Palade bodies or targeted to lysosomes for degradation. A potential player in this complex endocytic itinerary is SNX17, a member of the sorting nexin family, which has been shown in a yeast two-hybrid assay to bind P-selectin. Here, we show that overexpression of SNX17 in mammalian cells can influence two key steps in the endocytic trafficking of P-selectin. First, it promotes the endocytosis of P-selectin from the plasma membrane. Second, it inhibits the movement of P-selectin into lysosomes, thereby reducing its degradation.
Am Soc Cell Biol