Involvement of Platelet-Derived Growth Factor–BB and Its Receptor-β in Hypoxia-Induced Depression of Excitatory Synaptic Transmission in the Nucleus Tractus Solitarius of Mice

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The role of platelet-derived growth factor (PDGF)-BB / PDGF receptor (PDGFR)-β signal in inhibition of synaptic transmission by hypoxia is unclear. In the nucleus tractus solitarius neurons, hypoxia with N₂ or NaCN decreased the amplitude of excitatory postsynaptic currents (EPSCs) similarly in wild type (WT) and PDGFR-β gene–knockout (KO) mice. Recovery of EP SCs after a high concentration of NaCN in KO mice was significantly faster than that in WT mice, while recovery after a low concentration of NaCN or N₂ was not different between both mice. These results suggest that the PDGF-BB / PDGFR-β signal modulates the excitatory synaptic transmission during hypoxia.