title: Spatial regulation of EGFR signaling by Sprouty2.
abstract: Ligand-induced activation of the epidermal growth factor receptor (EGFR) initiates multiple signal-transduction pathways as well as trafficking events that relocalize the receptors from the cell surface to intracellular endocytic compartments. Although there is growing awareness that endocytic transport can play a direct role in signal specification, relatively little is known about the molecular mechanisms underlying this link. Here we show that human Sprouty 2 (hSpry2), a protein that has been implicated in the negative regulation of receptor tyrosine kinase (RTK) signaling [1], interferes with the trafficking of activated EGFR specifically at the step of progression from early to late endosomes. This effect is mediated by the binding of hSpry2 to the endocytic regulatory protein, hepatocyte growth factor-regulated tyrosine kinase substrate (Hrs), and leads to a block in intracellular signal propagation. These observations suggest that EGFR signaling is controlled by a novel mechanism involving trafficking-dependent alterations in receptor compartmentalization.
authors.affiliation: Graduate Program in Molecular and Cellular Biology, State University of New York at Stony Brook, Stony Brook, NY 11794-5222, USA.
authors.forename: Hong Joo
authors.initials: HJ
authors.lastname: Kim
authors.forename: Laura J
authors.initials: LJ
authors.lastname: Taylor
authors.forename: Dafna
authors.initials: D
authors.lastname: Bar-Sagi
mesh_terms: D000818:Animals; D019556:COS Cells; D045744:Cell Line, Tumor; D002522:Chlorocebus aethiops; D004705:Endocytosis; D056827:Endosomal Sorting Complexes Required for Transport; D011992:Endosomes / Q000378:metabolism; D066246:ErbB Receptors / Q000378:metabolism*; D005786:Gene Expression Regulation; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins / Q000378:metabolism*; D008565:Membrane Proteins; D010750:Phosphoproteins / Q000378:metabolism; D015398:Signal Transduction
chemical_list: D056827:Endosomal Sorting Complexes Required for Transport; D047908:Intracellular Signaling Peptides and Proteins; D008565:Membrane Proteins; D010750:Phosphoproteins; C485561:SPRY2 protein, human; C096164:hepatocyte growth factor-regulated tyrosine kinase substrate; D066246:ErbB Receptors