title: ARF6: a newly appreciated player in G protein-coupled receptor desensitization.
abstract: The luteinizing hormone/choriogonadotropin hormone receptor (LH/CG R) signals to regulate ovulation, corpus luteum formation, and fetal survival during pregnancy. Agonist binding to the LH/CG R is poorly reversible, emphasizing the importance of a cellular mechanism to temper signaling by a potentially persistently active receptor. Like other G protein-coupled receptors (GPCRs), signaling by this receptor is modulated by its binding of an arrestin. We have identified ADP ribosylation factor 6 (ARF6) as a protein whose activation state is regulated by the LH/CG R and which functions to regulate the availability of plasma membrane-docked arrestin 2 to this receptor. We hypothesize that ARF6 might also serve GPCRs other than the LH/CG R to regulate the availability of arrestin 2 for receptor desensitization.
authors.affiliation: Department of Cell and Molecular Biology, Northwestern University Medical School, 303 East Chicago Avenue, Chicago, IL 60611, USA. mhd@northwestern.edu
authors.forename: Mary
authors.initials: M
authors.lastname: Hunzicker-Dunn
authors.forename: Vsevolod V
authors.initials: VV
authors.lastname: Gurevich
authors.forename: James E
authors.initials: JE
authors.lastname: Casanova
authors.forename: Sutapa
authors.initials: S
authors.lastname: Mukherjee
mesh_terms: D000089982:ADP-Ribosylation Factor 6; D020727:ADP-Ribosylation Factors / Q000378:metabolism* / Q000502:physiology; D000818:Animals; D019390:Arrestins / Q000378:metabolism; D006063:Chorionic Gonadotropin / Q000378:metabolism; D019204:GTP-Binding Proteins / Q000378:metabolism*; D006801:Humans; D007986:Luteinizing Hormone / Q000378:metabolism; D010750:Phosphoproteins / Q000378:metabolism; D011956:Receptors, Cell Surface / Q000378:metabolism* / Q000502:physiology; D011974:Receptors, LH / Q000378:metabolism*
chemical_list: D000089982:ADP-Ribosylation Factor 6; D019390:Arrestins; D006063:Chorionic Gonadotropin; D010750:Phosphoproteins; D011956:Receptors, Cell Surface; D011974:Receptors, LH; D007986:Luteinizing Hormone; D019204:GTP-Binding Proteins; D020727:ADP-Ribosylation Factors; C000715348:ARF6 protein, human