Research article summary (published 12 Mar 1997):

Augmentation of nociceptive reflexes and chronic deafferentation pain by chemical lesions of either dopaminergic terminals or midbrain dopaminergic neurons.

Full Abstract

Neurodegenerative diseases affecting the midbrain dopaminergic system have been reported to produce spontaneous pains like in Parkinson's disease. Using various pain tests for acute (hot plate test, HPT, tail flick, TFT, paw pressure test, PPT and paw immersion test, PIT) and chronic deafferentation (autotomy, AT, following peripheral neurectomy) pains in rats, we have investigated the effects on these tests of selective chemical lesions with 6-hydroxydopamine (6-OHDA) or/and kainic acid (KA) either in the striatum or in the substantia nigra (SN) and ventral tegmental area (VTA). 6-OHDA lesions of dopaminergic terminals in the striatum decreased significantly the latencies of all nociceptive reflexes (HPT from 11.7 +/- 1.45 s to 7 +/- 1.35 s, TFT from 4.5 +/- 0.15 s to 3.2 +/- 0.16 s and PPT on the contralateral leg from 2.07 +/- 0.45 s to 1.05 +/- 0.085 s) and accelerated the time of onset (from 10.82 +/- 2.3 days to 3.1 +/- 0.52 days) and end (from 29.5 +/- 5.6 days to 5.2 +/- 1.1 days) of AT. These effects were not modified by simultaneous injection of KA and 6-OHDA in the striatum. 6-OHDA lesions in the SN-VTA produced comparable effects to those of similar injections in the striatum, while KA lesions in the SN-VTA did not produce significant changes in the latencies of nociceptive reflexes or in the AT criteria. These results suggest that the dopaminergic system plays a major role in the processing of nociceptive information in the striatum and the limbic areas.

Author information

Author/s: Saadé, N E (NE); Atweh, S F (SF); Bahuth, N B (NB); Jabbur, S J (SJ);

Affiliation: Department of Human Morphology, Faculty of Medicine, American University of Beirut, Lebanon. nesaade(-atsign-)aub.edu.lb

Journal and publication information

Publication Type: Journal Article; Research Support, Non-U.S. Gov't

Journal: Brain research (Brain Res), published in NETHERLANDS. (Language: eng)

Reference: 1997-Mar; vol 751 (issue 1) : pp 1-12

Dates: Created 1997/06/09; Completed 1997/06/09; Revised 2006/11/15;

PMID: 9098562, status: MEDLINE (last retrieval date: 2/18/2009, IMS Date: )

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Animals Behavior, Animal - physiology Chronic Disease Denervation Dopamine - physiology Excitatory Amino Acid Agonists Female Kainic Acid Ligation Male Microinjections Neostriatum - chemistry; cytology; physiology

Nerve Endings - chemistry; physiology Neurons - chemistry; physiology; ultrastructure Nociceptors - physiology Oxidopamine Pain - physiopathology Rats Rats, Sprague-Dawley Reflex - physiology Sciatic Nerve - surgery Substantia Nigra - chemistry; cytology; physiology Sympatholytics Ventral Tegmental Area - chemistry; cytology; physiology

Associated Chemicals: Excitatory Amino Acid Agonists (0) ; Sympatholytics (0) ; Oxidopamine (1199-18-4) ; Kainic Acid (487-79-6) ; Dopamine (51-61-6)

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