Abstract:
:This study examined the nociceptive effects of the intrathecal administration of various doses of the following endogenous excitatory sulphur-containing amino acids (SAAs): L-cysteic acid (L-CA), L-cysteine sulfinic acid (L-CSA), L-homocysteic acid (L-HCA) and L-homocysteic sulfinic acid (L-HCSA). For a period of 10min, rats were observed for spontaneous nociceptive behaviours (SNBs), including: tail elevation, twitching or licking; hindpaw elevation, licking or shaking; and caudally directed biting or scratching. The amount of time each rat spent eliciting these individual behaviours was recorded and a total time (in seconds) spent exhibiting SNBs was then calculated. To determine which glutamate receptors are primarily responsible for these nociceptive behaviours, we pretreated additional groups of rats with selective antagonists for N-methyl-D-aspartate (NMDA), alpha-amino-3-hydroxy-5-methyl-4-isoxazole proprionic acid/kainate (AMPA/KA) and group I metabotropic glutamate receptors (mGluR1 and 5). Results indicate that SAAs dose-dependently produce SNBs that are attenuated by NMDA receptor and group I mGluR antagonists.
journal_name
Behav Brain Resjournal_title
Behavioural brain researchauthors
Osborne MG,Coderre TJdoi
10.1016/s0166-4328(03)00064-0subject
Has Abstractpub_date
2003-09-15 00:00:00pages
105-10issue
1-2eissn
0166-4328issn
1872-7549pii
S0166432803000640journal_volume
144pub_type
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