Glutamate transmission in the rostral ventrolateral medullary sympathetic premotor pathway.

Abstract:

:1. The aim of these studies was to test the hypothesis that glutamate is the principal excitatory neurotransmitter in the sympathetic premotor pathway from the rostral ventrolateral medulla (RVLM) to the sympathetic preganglionic neurons (SPNs) in the thoracic spinal cord. 2. Iontophoretic and pressure ejection of glutamate receptor agonists and antagonists was made onto antidromically identified splanchnic and adrenal SPNs before and during electrical stimulation of the RVLM in urethane/chloralose-anesthetized, artificially ventilated rats. 3. SPNs were excited by both NMDA and non-NMDA glutamate receptor agonists. Blockade of glutamate receptors in the IML interrupted the ability of electrical activation of sympathetic premotor neurons in the RVLM to excite SPNs. Within the IML, antergradely labeled terminals of RVLM neurons were found to contain glutamate immunoreactivity and to make asymmetric synapses on local dendrites. 4. These data support a significant role for glutamate neurotransmission in mediating the tonic and phasic excitation of SPNs by the sympathetic premotor pathway from the RVLM. It seems likely that stimulation of the RVLM produces glutamate release from both C1 and non-PNMT-containing axon terminals in the IML.

journal_name

Cell Mol Neurobiol

authors

Morrison SF

doi

10.1023/a:1025005020376

subject

Has Abstract

pub_date

2003-10-01 00:00:00

pages

761-72

issue

4-5

eissn

0272-4340

issn

1573-6830

journal_volume

23

pub_type

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