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The Journal of Neuroscience, June 15, 1998, 18(12):4646-4655
A Developmental Shift from GABAergic to Glycinergic Transmission in the Central Auditory System
Vibhakar C. Kotak1, Sailaja Korada3, Ilsa R. Schwartz3, and Dan H. Sanes1, 2 1 Center for Neural Science and 2 Department of Biology, New York University, New York, New York 10003, and 3 Department of Surgery/Otolaryngology, Yale University School of Medicine, New Haven, Connecticut 06520-8041
GABAergic and glycinergic circuits are found throughout the auditory brainstem, and it is generally assumed that transmitter phenotype is established early in development. The present study documents a profound transition from GABAergic to glycinergic transmission in the gerbil lateral superior olive (LSO) during the first 2 postnatal weeks. Whole-cell voltage-clamp recordings were obtained from LSO neurons in a brain slice preparation, and IPSCs were evoked by electrical stimulation of the medial nucleus of the trapezoid body (MNTB), a known glycinergic projection in adult animals. GABAergic and glycinergic components were identified by blocking transmission with bicuculline and strychnine (SN), respectively. In the medial limb of LSO, there was a dramatic change in the GABAergic IPSC component, decreasing from 78% at postnatal day 3 (P3)-P5 to 12% at P12-P16. There was an equal and opposite increase in the glycinergic component during this same period. Direct application of GABA also elicited significantly larger amplitude and longer duration responses in P3-P5 neurons compared with glycine-evoked responses. In contrast, MNTB-evoked IPSCs in lateral limb neurons were more sensitive to SN throughout development. Consistent with the electrophysiological observations, there was a reduction in staining for the
2,3-GABAA receptor subunit from P4 to P14, whereas staining for the glycine receptor-associated protein gephyrin increased. Brief exposure to baclofen depressed transmission at excitatory and inhibitory synapses for ~15 min, suggesting a GABAB-mediated metabotropic signal. Collectively, these data demonstrate a striking switch from GABAergic to glycinergic transmission during postnatal development. Although GABA and glycine elicit similar postsynaptic ionotropic responses, our results raise the possibility that GABAergic transmission in neonates may play a developmental role distinct from that of glycine.
Key words: GABAA; glycine; inhibition; GABAB; development; gerbil; lateral superior olive
Copyright © 1998 Society for Neuroscience 0270-6474/98/18124646-10$05.00/0
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