Brain-derived neurotrophic factor activation of CaM-kinase kinase via transient receptor potential canonical channels induces the translation and synaptic incorporation of GluA1-containing calcium-permeable AMPA receptors.
Glutamatergic synapses in early postnatal development transiently express calcium-permeable AMPA receptors (CP-AMPARs). Although these GluA2-lacking receptors are essential and are elevated in response to brain-derived neurotrophic factor (BDNF), little is known regarding molecular mechanisms that govern their expression and synaptic insertion. Here we show that BDNF-induced GluA1 translation in rat primary hippocampal neurons requires the activation of mammalian target of rapamycin (mTOR) via calcium calmodulin-dependent protein kinase kinase (CaMKK). Specifically, BDNF-mediated phosphorylation of threonine 308 (T308) in AKT, a known substrate of CaMKK and an upstream activator of mTOR-dependent translation, was prevented by (1) pharmacological inhibition of CaMKK with STO-609, (2) overexpression of a dominant-negative CaMKK, or (3) short hairpin-mediated knockdown of CaMKK. GluA1 surface expression induced by BDNF, as assessed by immunocytochemistry using an extracellular N-terminal GluA1 antibody or by surface biotinylation, was impaired following knockdown of CaMKK or treatment with STO-609. Activation of CaMKK by BDNF requires transient receptor potential canonical (TRPC) channels as SKF-96365, but not the NMDA receptor antagonist d-APV, prevented BDNF-induced GluA1 surface expression as well as phosphorylation of CaMKI, AKT(T308), and mTOR. Using siRNA we confirmed the involvement of TRPC5 and TRPC6 subunits in BDNF-induced AKT(T308) phosphorylation. The BDNF-induced increase in mEPSC was blocked by IEM-1460, a selected antagonist of CP-AMPARs, as well as by the specific repression of acute GluA1 translation via siRNA to GluA1 but not GluA2. Together these data support the conclusion that newly synthesized GluA1 subunits, induced by BDNF, are readily incorporated into synapses where they enhance the expression of CP-AMPARs and synaptic strength.
Vollum Institute, Oregon Health and Science University, Portland, Oregon 97239, USA. fortind@ohsu.edu
Dale A
DA
Fortin
Taasin
T
Srivastava
Diya
D
Dwarakanath
Philippe
P
Pierre
Sean
S
Nygaard
Victor A
VA
Derkach
Thomas R
TR
Soderling
D015763:2-Amino-5-phosphonovalerate / Q000494:pharmacology; D000218:Adamantane / Q000031:analogs & derivatives / Q000494:pharmacology; D000818:Animals; D001562:Benzimidazoles / Q000494:pharmacology; D019208:Brain-Derived Neurotrophic Factor / Q000502:physiology*; D002121:Calcium Channel Blockers / Q000494:pharmacology; D054737:Calcium-Calmodulin-Dependent Protein Kinase Kinase / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D004791:Enzyme Inhibitors / Q000494:pharmacology; D018691:Excitatory Amino Acid Antagonists / Q000494:pharmacology; D005260:Female; D055785:Gene Knockdown Techniques; D006624:Hippocampus / Q000187:drug effects / Q000378:metabolism / Q000502:physiology; D007093:Imidazoles / Q000494:pharmacology; D008297:Male; D055369:Miniature Postsynaptic Potentials / Q000187:drug effects / Q000502:physiology; D053644:Naphthalimides / Q000494:pharmacology; D009474:Neurons / Q000187:drug effects / Q000378:metabolism; D061251:Primary Cell Culture; D034741:RNA, Small Interfering / Q000008:administration & dosage / Q000235:genetics; D051381:Rats; D017207:Rats, Sprague-Dawley; D018091:Receptors, AMPA / Q000378:metabolism*; D058570:TOR Serine-Threonine Kinases / Q000378:metabolism; D050052:TRPC Cation Channels / Q000235:genetics / Q000502:physiology*
D015763:2-Amino-5-phosphonovalerate; D000218:Adamantane; D001562:Benzimidazoles; D019208:Brain-Derived Neurotrophic Factor; D002121:Calcium Channel Blockers; D054737:Calcium-Calmodulin-Dependent Protein Kinase Kinase; D004791:Enzyme Inhibitors; D018691:Excitatory Amino Acid Antagonists; D007093:Imidazoles; D053644:Naphthalimides; D034741:RNA, Small Interfering; D018091:Receptors, AMPA; D058570:TOR Serine-Threonine Kinases; D050052:TRPC Cation Channels; C110702:IEM 1460; C458525:STO 609; C503500:Trpc5 protein, rat; C492145:Trpc6 protein, rat; C546845:mTOR protein, rat; C063159:1-(2-(3-(4-methoxyphenyl)propoxy)-4-methoxyphenylethyl)-1H-imidazole