title: Beta-arrestin2 enhances beta2-adrenergic receptor-mediated nuclear translocation of ERK.
abstract: Beta-arrestin mediates desensitization and internalization of beta-adrenergic receptors (betaARs), but also acts as a scaffold protein in extracellular signal-regulated kinase (ERK) cascade. Thus, we have examined the role of beta-arrestin2 in the betaAR-mediated ERK signaling pathways. Isoproterenol stimulation equally activated cytoplasmic and nuclear ERK in COS-7 cells expressing beta1AR or beta2AR. However, the activity of nuclear ERK was enhanced by co-expression of beta-arrestin2 in beta2AR-but not beta1AR-expressing cells. Pertussis toxin treatment and blockade of Gbetagamma action inhibited beta-arrestin2-enhanced nuclear activation of ERK, suggesting that beta-arrestin2 promotes nuclear ERK localization in a Gbetagamma dependent mechanism upon receptor stimulation. beta2AR containing the carboxyl terminal region of beta1AR lost the beta-arrestin2-promoted nuclear translocation. As the carboxyl terminal region is important for beta-arrestin binding, these results demonstrate that recruitment of beta-arrestin2 to carboxyl terminal region of beta2AR is important for ERK localization to the nucleus.
authors.affiliation: Department of Pharmacology and Toxicology, Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Fukuoka 812-8582, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Kobayashi
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Narita
authors.forename: Motohiro
authors.initials: M
authors.lastname: Nishida
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Kurose
mesh_terms: D000818:Animals; D019390:Arrestins / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D019556:COS Cells; D002467:Cell Nucleus / Q000378:metabolism*; D002522:Chlorocebus aethiops; D017868:Cyclic AMP-Dependent Protein Kinases / Q000235:genetics; D003593:Cytoplasm / Q000378:metabolism; D048049:Extracellular Signal-Regulated MAP Kinases / Q000378:metabolism*; D020962:Heterotrimeric GTP-Binding Proteins / Q000037:antagonists & inhibitors; D006801:Humans; D007545:Isoproterenol / Q000494:pharmacology; D008856:Microscopy, Fluorescence; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism; D010766:Phosphorylation / Q000187:drug effects; D011485:Protein Binding; D047428:Protein Kinase Inhibitors / Q000494:pharmacology; D021381:Protein Transport; D011743:Pyrimidines / Q000494:pharmacology; D018342:Receptors, Adrenergic, beta-1 / Q000235:genetics / Q000378:metabolism; D018343:Receptors, Adrenergic, beta-2 / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D015398:Signal Transduction / Q000187:drug effects / Q000502:physiology; D014162:Transfection; D051552:beta-Adrenergic Receptor Kinases; D000071557:beta-Arrestins; D019061:src-Family Kinases / Q000037:antagonists & inhibitors
chemical_list: C412373:AG 1879; D019390:Arrestins; D047428:Protein Kinase Inhibitors; D011743:Pyrimidines; D018342:Receptors, Adrenergic, beta-1; D018343:Receptors, Adrenergic, beta-2; D011993:Recombinant Fusion Proteins; D000071557:beta-Arrestins; D019061:src-Family Kinases; D017868:Cyclic AMP-Dependent Protein Kinases; D051552:beta-Adrenergic Receptor Kinases; D048049:Extracellular Signal-Regulated MAP Kinases; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; D020962:Heterotrimeric GTP-Binding Proteins; D007545:Isoproterenol