Document Detail


Calcitonin gene-related peptide (CGRP) modulates nociceptive trigeminovascular transmission in the cat.
MedLine Citation:
PMID:  15237097     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Calcitonin gene-related peptide (CGRP) is released into the cranial circulation of humans during acute migraine. To determine whether CGRP is involved in neurotransmission in craniovascular nociceptive pathways, we microiontophoresed onto neurons in the trigeminocervical complex and intravenously administered the CGRP receptor antagonists alpha-CGRP-(8-37) and BIBN4096BS. Cats were anaesthetised with alpha-chloralose, and using halothane during surgical preparation. A craniotomy and C1/C2 laminectomy allowed access to the superior sagittal sinus (SSS) and recording site. Recordings of activity in the trigeminocervical complex evoked by electrical stimulation of the SSS were made. Multibarrelled micropipettes incorporating a recording electrode were used for microiontophoresis of test substances. Cells recorded received wide dynamic range (WDR) or nociceptive specific (NS) input from cutaneous receptive fields on the face or forepaws. Cell firing was increased to 25-30 Hz by microiontophoresis of L-glutamate (n = 43 cells). Microiontophoresis of alpha-CGRP excited seven of 17 tested neurons. BIBN4096BS inhibited the majority of units (26 of 38 cells) activated by l-glutamate, demonstrating a non-presynaptic site of action for CGRP. alpha-CGRP-(8-37) inhibited a similar proportion of units (five of nine cells). Intravenous BIBN4096BS resulted in a dose-dependent inhibition of trigeminocervical SSS-evoked activity (ED50 31 microg kg(-1)). The maximal effect observed within 30 min of administration. The data suggest that there are non-presynaptic CGRP receptors in the trigeminocervical complex that can be inhibited by CGRP receptor blockade and that a CGRP receptor antagonist would be effective in the acute treatment of migraine and cluster headache.
Authors:
Robin James Storer; Simon Akerman; Peter J Goadsby
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2004-07-05
Journal Detail:
Title:  British journal of pharmacology     Volume:  142     ISSN:  0007-1188     ISO Abbreviation:  Br. J. Pharmacol.     Publication Date:  2004 Aug 
Date Detail:
Created Date:  2004-07-30     Completed Date:  2005-08-04     Revised Date:  2013-06-09    
Medline Journal Info:
Nlm Unique ID:  7502536     Medline TA:  Br J Pharmacol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1171-81     Citation Subset:  IM    
Copyright Information:
Copyright 2004 Nature Publishing Group
Affiliation:
Headache Group, Institute of Neurology, Queen Square, London WCIN SBG.
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MeSH Terms
Descriptor/Qualifier:
Action Potentials
Animals
Brain / blood supply*
Calcitonin Gene-Related Peptide / pharmacology*
Cats
Dose-Response Relationship, Drug
Injections, Intravenous
Iontophoresis
Peptide Fragments / pharmacology*
Piperazines / administration & dosage,  pharmacology*,  therapeutic use
Quinazolines / administration & dosage,  pharmacology*,  therapeutic use
Receptors, Calcitonin Gene-Related Peptide / antagonists & inhibitors*,  physiology
Receptors, Presynaptic / antagonists & inhibitors,  physiology
Synaptic Transmission / drug effects,  physiology*
Time Factors
Trigeminal Caudal Nucleus / drug effects,  physiology
Trigeminal Nuclei / drug effects,  physiology*
Chemical
Reg. No./Substance:
0/BIBN 4096BS; 0/Peptide Fragments; 0/Piperazines; 0/Quinazolines; 0/Receptors, Calcitonin Gene-Related Peptide; 0/Receptors, Presynaptic; 119911-68-1/calcitonin gene-related peptide (8-37); 83652-28-2/Calcitonin Gene-Related Peptide
Comments/Corrections
Comment In:
Br J Pharmacol. 2004 Aug;142(7):1053-4   [PMID:  15237096 ]

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