title: Platelet-derived growth factor (PDGF)-BB inhibits AMPA receptor-mediated synaptic transmission via PDGF receptor-beta in murine nucleus tractus solitarius.
abstract: Although platelet-derived growth factor (PDGF)-BB activates PDGF receptor-beta (PDGFR-beta) and, in turn, inhibits the glutamate N-methyl-D-aspartate (NMDA) receptor function, whether PDGF-BB modulates the CNS function mediated by another glutamate receptors, alpha-amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA) receptors, remains poorly understood. Here we now report the inhibitory effect of PDGF-BB on the AMPA receptor function in the nucleus tractus solitarius (NTS) by using slice patch-clamp techniques. Excitatory postsynaptic currents (EPSCs) were evoked by electrical stimulation of the tractus solitarius in mouse NTS second-order neurons. EPSCs were nearly completely eliminated by CNQX but not by MK-801, implying mediation through non-NMDA receptors. PDGF-BB significantly decreased the amplitude of EPSCs without affecting the mean decay time constant. This inhibitory effect was transient and reversible after removing PDGF-BB. Furthermore, PDGF-BB significantly reduced the amplitude of AMPA-induced currents in NTS neurons, which showed that PDGF-BB could suppress the AMPA receptor-mediated excitatory input via the postsynaptic mechanism. The inhibitory effect of PDGF-BB on EPSCs was not observed in mutant mice with conditional deletion of the PDGFR-beta gene in neurons. Together, these studies suggest that the PDGF-B/PDGFR-beta axis inhibits the AMPA receptor-mediated synaptic transmission that comprises the major part of the primary afferent to the NTS second-order neuron. The detected inhibitory action may be involved in the CNS regulation of the respiratory response.
authors.affiliation: Department of Molecular and Medical Pharmacology, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan.
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Ohi
authors.forename: Yoko
authors.initials: Y
authors.lastname: Ishii
authors.forename: Akira
authors.initials: A
authors.lastname: Haji
authors.forename: Shigeru
authors.initials: S
authors.lastname: Noguchi
authors.forename: Toshikuni
authors.initials: T
authors.lastname: Sasaoka
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Fujimori
authors.forename: Yo-ichi
authors.initials: Y
authors.lastname: Nabeshima
authors.forename: Masakiyo
authors.initials: M
authors.lastname: Sasahara
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Hattori
mesh_terms: D018750:6-Cyano-7-nitroquinoxaline-2,3-dione / Q000494:pharmacology; D000704:Analysis of Variance; D043925:Angiogenesis Inducing Agents / Q000494:pharmacology*; D000818:Animals; D000077214:Becaplermin; D016291:Dizocilpine Maleate / Q000494:pharmacology; D004347:Drug Interactions; D004558:Electric Stimulation / Q000379:methods; D018691:Excitatory Amino Acid Antagonists / Q000494:pharmacology; D019706:Excitatory Postsynaptic Potentials / Q000187:drug effects / Q000502:physiology / Q000528:radiation effects; D066298:In Vitro Techniques; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D018408:Patch-Clamp Techniques / Q000379:methods; D010744:Phosphoric Monoester Hydrolases / Q000378:metabolism; D010982:Platelet-Derived Growth Factor / Q000494:pharmacology*; D020574:Proto-Oncogene Proteins c-sis; D011930:Reaction Time / Q000187:drug effects; D020797:Receptor, Platelet-Derived Growth Factor beta / Q000172:deficiency / Q000502:physiology*; D018091:Receptors, AMPA / Q000502:physiology*; D017552:Solitary Nucleus / Q000166:cytology*; D009435:Synaptic Transmission / Q000187:drug effects* / Q000502:physiology / Q000528:radiation effects
chemical_list: D043925:Angiogenesis Inducing Agents; D018691:Excitatory Amino Acid Antagonists; D010982:Platelet-Derived Growth Factor; D020574:Proto-Oncogene Proteins c-sis; D018091:Receptors, AMPA; D000077214:Becaplermin; D016291:Dizocilpine Maleate; D018750:6-Cyano-7-nitroquinoxaline-2,3-dione; D020797:Receptor, Platelet-Derived Growth Factor beta; D010744:Phosphoric Monoester Hydrolases