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Updated: Jul 8, 2026
Manufacturing and Using Piggy-back Multibarrel Electrodes for In vivo Pharmacological Manipulations of Neural Responses
Published on: January 18, 2013
Presynaptic GABA(B) receptors modulate synaptic facilitation and depression at distinct synapses in fusiform cells of
Tomohiko Irie1, Harunori Ohmori
1Department of Physiology, Faculty of Medicine, Kyoto University, Yoshida-Konoe-Cho, Sakyo-Ku, Kyoto 606-8501, Japan.
Abstract:
The mammalian dorsal cochlear nucleus (DCN) is considered to contribute to the localization of the sound sources. Fusiform cells (FCs), principal projection neurons in the DCN, integrate two excitatory inputs from auditory nerve fibers (ANFs) and parallel fibers (PFs). Although an immunohistochemical study suggested presence of GABA(B) receptors at excitatory presynaptic terminals in the DCN, it has not been elucidated how GABA(B) receptors modulate the synaptic transmission to FCs. Here, we examined effects of baclofen on the transmission in vitro. Baclofen reduced both PF-EPSC and ANF-EPSC by reducing transmitter releases, and it enhanced the facilitation in PF-FC synapses and prevented the depression in ANF-FC synapses. The enhancement and prevention were prominent during high-frequency (50Hz) synaptic input, suggesting the activation of presynaptic GABA(B) receptors may optimize both PF-FC and ANF-FC synapses for high-frequency transmission. Postsynaptic GABA(B) receptors activated GIRK current and would further modulate the activity of FCs.
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