Expression of metabotropic glutamate receptors in nodose ganglia and the nucleus of the solitary tract.
The purpose of this study was to identify the complement of metabotropic glutamate receptors (mGluRs) expressed in nodose ganglia and the nucleus tractus solitarius (NTS). mRNA from these tissues was isolated and amplified with standard RT-PCR with primers specific for each mGluR subtype. The results of this analysis showed that the NTS expresses all eight mGluR subtypes, whereas nodose ganglia express only group III mGluRs: mGluR4, mGluR6, mGluR7, and mGluR8. Application of the group III-specific mGluR agonist L-(+)-2-amino-4-phosphonobutyric acid (100 microM) reversibly inhibited voltage-gated calcium currents isolated from DiI-labeled aortic baroreceptor neurons and unlabeled nodose neurons. The results of this study suggest that group III mGluRs are the primary mGluR subtype expressed in visceral afferent neurons and that these receptors may be involved in afferent central transmission.
Hoang
C J
CJ
Dalton Cardiovascular Research Center, University of Missouri at Columbia, Columbia, Missouri 65211, USA.
Hay
M
M
D000818:Animals; D015220:Calcium Channels / Q000187:drug effects / Q000502:physiology; D002478:Cells, Cultured; D004553:Electric Conductivity; D004594:Electrophysiology; D015640:Ion Channel Gating / Q000502:physiology; D008297:Male; D009474:Neurons / Q000378:metabolism; D009620:Nodose Ganglion / Q000166:cytology / Q000378:metabolism*; D018408:Patch-Clamp Techniques; D011422:Propionates / Q000494:pharmacology; D020033:Protein Isoforms / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D018094:Receptors, Metabotropic Glutamate / Q000235:genetics / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017552:Solitary Nucleus / Q000166:cytology / Q000378:metabolism*
C114785:2-amino-4-phosphono-propinate; D015220:Calcium Channels; D011422:Propionates; D020033:Protein Isoforms; D012333:RNA, Messenger; D018094:Receptors, Metabotropic Glutamate