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Neurochemical mediators of the behavioural effects of receptor-selective substance P agonists administered intrathecally in the rat
- Source :
- Neuropharmacology. 29:1055-1065
- Publication Year :
- 1990
- Publisher :
- Elsevier BV, 1990.
-
Abstract
- Recently, two compounds have been developed, designated septide and senktide, which are highly selective agonists for the substance P receptor, types NK-1 and NK-3, respectively. Each of these, when injected intrathecally in awake rats, produced a distinct and non-overlapping constellation of sensory and behavioural effects which were subsets of the symptoms evoked by intrathecal administration of substance P. Prior systemic administration of 5-hydroxytryptamine (5-HT), alpha-adrenergic and opiate receptor antagonists, at doses sufficient to block the behavioural effects of the corresponding receptor agonists, did not alter responses to intrathecally injected septide or senktide. This was so, even for symptoms which suggested inhibitory mediation, hypoalgesia and (transient) motor flaccidity. Septide and senktide, administered by lumbar puncture and by indwelling catheter, produced identical results. Finally, in contrast to some other peptides, flaccid paralysis induced by senktide was not accompanied by spinal necrosis.
- Subjects :
- Male
Serotonin
Posture
Central nervous system
Pain
Substance P
Pharmacology
Substance-P Receptor
Phenylephrine
Cellular and Molecular Neuroscience
chemistry.chemical_compound
Neurochemical
medicine
Animals
Phentolamine
Injections, Spinal
Hypoalgesia
Morphine
Methysergide
Naloxone
business.industry
Muscles
Rats, Inbred Strains
Peptide Fragments
Rats
Nociception
medicine.anatomical_structure
Spinal Cord
chemistry
Anesthesia
Systemic administration
Stereotyped Behavior
Opiate
business
Subjects
Details
- ISSN :
- 00283908
- Volume :
- 29
- Database :
- OpenAIRE
- Journal :
- Neuropharmacology
- Accession number :
- edsair.doi.dedup.....8135302eeec88db9f6ac4d2ea6d0629e