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Coeruleotrigeminal inhibition of nociceptive processing in the rat trigeminal subnucleus caudalis.

Abstract：

:It has been accepted that the descending system from the nucleus locus coeruleus (LC)/nucleus subcoeruleus (SC) plays a significant role in spinal nociceptive processing. The present study was designed to examine modulation of nociceptive processing in the caudal part of the trigeminal sensory nuclear complex, the trigeminal subnucleus caudalis which is generally considered to be involved in the relay of oral-facial nociceptive information. Experiments were performed on anesthetized Sprague-Dawley rats. The site of LC/SC stimulation was confirmed by histology using potassium ferrocyanide to produce a Prussian blue reaction product marking the iron deposited from the stimulating electrode tip. Only data from rats which had electrode placements in the LC/SC were used. Electrical stimulation was delivered at a stimulus intensity below 100 microA in the present study. Stimulation at sites inside the LC/SC produced a reduction of both spontaneous activity and responses of subnucleus caudalis neurons to somatic input, especially nociceptive input. Increasing stimulation frequency in the LC/SC resulted in an increase in inhibitory effects on nociceptive responses of subnucleus caudalis neurons. At three of nine sites outside the LC/SC, electrical stimulation was effective on descending inhibition. A significant difference in the inhibitory effects was observed when the inhibitory effects were compared between sites of stimulation inside the LC/SC and three effective sites of stimulation outside the LC/SC. These findings suggest that nociceptive processing in the subnucleus caudalis is under the control of the descending modulation system from the LC/SC. To understand the effects of repetitive stimulation with high frequency on fine unmyelinated LC/SC fibers, the existence of recurrent collateral excitation in the LC/SC may be considered.

journal_name

Brain Res

journal_title

Brain research

authors

Tsuruoka M,Matsutani K,Maeda M,Inoue T

doi

10.1016/j.brainres.2003.09.023

subject

Has Abstract

pub_date

2003-12-12 00:00:00

pages

146-53

issue

1-2

eissn

0006-8993

issn

1872-6240

pii

S000689930303720X

journal_volume

993

pub_type

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Coeruleotrigeminal inhibition of nociceptive processing in the rat trigeminal subnucleus caudalis.