PMID: 11606637Oct 19, 2001Paper

The nonuniform distribution of the GABA(A) receptor alpha 1 subunit influences inhibitory synaptic transmission to motoneurons within a motor nucleus

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
J A O'Brien, A J Berger

Abstract

Using immunohistochemistry we studied the distribution of GABA(A) and glycine receptor alpha1 subunits in the rat hypoglossal nucleus during postnatal development. In the neonate [postnatal day (P) 1-3] and adult nucleus (P28-30), GABA(A) receptor alpha1 subunit labeling was relatively modest. However, in the juvenile nucleus (P9-13), labeling was strong in the ventrolateral region and moderate in the dorsal region. Glycine receptor alpha1 subunit labeling was strong and uniform in the juvenile and adult nucleus and absent in the neonate nucleus. GABA and glycine neurotransmitter labeling was uniform throughout the neonatal and juvenile nucleus. To study the functional consequences of this regional differential GABA(A) receptor alpha1 subunit distribution, we voltage clamped juvenile hypoglossal motoneurons (HMs) from the ventrolateral and dorsal regions and recorded spontaneous miniature IPSCs (mIPSCs). Pure GABAergic events had slower decay times than glycinergic events. Although pure GABAergic and glycinergic decay times did not differ depending on HM location, the decays of mixed mIPSCs from ventrolateral HMs, recorded without GABA(A) and glycine receptor antagonists, had significantly slower decays than mIPSCs from dorsal ...Continue Reading

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