Abstract：
:The periaqueductal gray (PAG)-nucleus retroambiguus (NRA) pathway has been known to be involved in the control of vocalization and sexual behavior. To know how the amygdaloid complex influences the PAG-NRA pathway, here we first examined the synaptic organization between the central amygdaloid nucleus (CeA) fibers and the PAG neurons that project to the NRA by using anterograde and retrograde tract-tracing techniques in the rat. After ipsilateral injections of biotinylated dextran amine (BDA) into the CeA and cholera toxin B subunit (CTb) into the NRA, the prominent overlapping distribution of BDA-labeled axon terminals and CTb-labeled neurons was found ipsilaterally in the lateral/ventrolateral PAG, where some of the BDA-labeled terminals made symmetrical synaptic contacts with somata and dendrites of the CTb-labeled neurons. After CTb injection into the lateral/ventrolateral PAG, CTb-labeled neurons were distributed mainly in the medial division of the CeA. After BDA injection into the lateral/ventrolateral PAG, BDA-labeled fibers were distributed mainly in and around the NRA within the medulla oblongata. Using a combined retrograde tracing and in situ hybridization technique, we further demonstrated that more than half of the CeA neurons labeled with Fluoro-Gold (FG) injected into the lateral/ventrolateral PAG were positive for glutamic acid decarboxylase 67 mRNA and that the vast majority of PAG neurons labeled with FG injected into the NRA expressed vesicular glutamate transporter 2 mRNA. The present results suggest that the glutamatergic PAG-NRA pathway is under the inhibitory influence of the GABAergic CeA neurons.
journal_name
Neurosci Resjournal_title
Neuroscience researchauthors
Oka T,Tsumori T,Yokota S,Yasui Ydoi
10.1016/j.neures.2008.10.004subject
Has Abstractpub_date
2008-12-01 00:00:00pages
286-98issue
4eissn
0168-0102issn
1872-8111pii
S0168-0102(08)00267-8journal_volume
62pub_type
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