title: Rap1-induced p38 mitogen-activated protein kinase activation facilitates AMPA receptor trafficking via the GDI.Rab5 complex. Potential role in (S)-3,5-dihydroxyphenylglycene-induced long term depression.
abstract: Recent evidence has emphasized the importance of p38 mitogen-activated protein kinase (MAPK) in the induction of metabotropic glutamate receptor (mGluR)-dependent long term depression (LTD) at hippocampal CA3-CA1 synapses. However, the cascade responsible of mGluR to activate p38 MAPK and the signaling pathway immediately downstream from it to induce synaptic depression is poorly understood. Here, we show that transient activation of group I mGluR with the selective agonist (S)-3,5-dihydroxyphenylglycine (DHPG) activates p38 MAPK through G protein betagamma-subunit, small GTPase Rap1, and MAPK kinase 3/6 (MKK3/6), thus resulting in mGluR5-dependent LTD. Furthermore, our data clearly show that an accelerating AMPA receptor endocytosis by stimulating the formation of guanyl nucleotide dissociation inhibitor-Rab5 complex is a potential downstream processing of p38 MAPK activation to mediate DHPG-LTD. These results suggest an important role for Rap1-MKK3/6-p38 MAPK pathway in the induction of mGluR-dependent LTD by directly coupling to receptor trafficking machineries to facilitate the loss of synaptic AMPA receptors.
authors.affiliation: Department of Pharmacology, College of Medicine, National Cheng Kung University, No. 1 University Road, Tainan City 701, Taiwan.
authors.forename: Chiung-Chun
authors.initials: CC
authors.lastname: Huang
authors.forename: Jia-Lin
authors.initials: JL
authors.lastname: You
authors.forename: Mei-Ying
authors.initials: MY
authors.lastname: Wu
authors.forename: Kuei-Sen
authors.initials: KS
authors.lastname: Hsu
mesh_terms: D000818:Animals; D015153:Blotting, Western; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000378:metabolism; D002462:Cell Membrane / Q000378:metabolism; D004594:Electrophysiology; D004705:Endocytosis; D044387:GTP-Binding Protein beta Subunits / Q000378:metabolism; D044388:GTP-Binding Protein gamma Subunits / Q000378:metabolism; D005998:Glycine / Q000031:analogs & derivatives* / Q000737:chemistry*; D020730:Guanine Nucleotide Dissociation Inhibitors / Q000378:metabolism*; D006624:Hippocampus / Q000378:metabolism; D048371:MAP Kinase Kinase 3; D048669:MAP Kinase Kinase 6; D020935:MAP Kinase Signaling System; D008297:Male; D008734:Methoxyhydroxyphenylglycol / Q000031:analogs & derivatives* / Q000378:metabolism; D020929:Mitogen-Activated Protein Kinase Kinases / Q000378:metabolism; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism*; D008954:Models, Biological; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D021381:Protein Transport; D011505:Protein-Tyrosine Kinases / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D018091:Receptors, AMPA / Q000378:metabolism*; D012118:Resorcinols / Q000737:chemistry*; D015398:Signal Transduction; D013569:Synapses / Q000378:metabolism; D013997:Time Factors; D048051:p38 Mitogen-Activated Protein Kinases; D020696:rab5 GTP-Binding Proteins / Q000378:metabolism*; D020827:rap1 GTP-Binding Proteins / Q000378:metabolism*
chemical_list: C118981:G-protein Beta gamma; D044387:GTP-Binding Protein beta Subunits; D044388:GTP-Binding Protein gamma Subunits; D020730:Guanine Nucleotide Dissociation Inhibitors; D018091:Receptors, AMPA; D012118:Resorcinols; D008734:Methoxyhydroxyphenylglycol; C079215:3,5-dihydroxyphenylglycine; D011505:Protein-Tyrosine Kinases; D017871:Calcium-Calmodulin-Dependent Protein Kinases; D020928:Mitogen-Activated Protein Kinases; D048051:p38 Mitogen-Activated Protein Kinases; D048371:MAP Kinase Kinase 3; D048669:MAP Kinase Kinase 6; D020929:Mitogen-Activated Protein Kinase Kinases; D020696:rab5 GTP-Binding Proteins; D020827:rap1 GTP-Binding Proteins; D005998:Glycine; C010117:3,4-dihydroxyphenylglycol