Blockade of calcitonin gene-related peptide release after superior sagittal sinus stimulation in cat: a comparison of avitriptan and CP122,288.

Abstract:

:The pathophysiological basis for the pain of migraine has been the subject of substantial attention and must include activation of elements of the trigeminal innervation of the cranial vessels, the trigeminovascular system. Recently, consideration of trigeminal-evoked neurogenic plasma protein extravasation (PPE) as a model for the pain has driven the search for compounds with specific anti-extravasation properties. Calcitonin gene-related peptide (CGRP) is a marker for trigeminovascular activation and is released during the headache phase of migraine and cluster headache. CGRP may have a role in migraine through its potent cranial vasodilator effects or by an action on trigeminal nerve activity, both of which are targeted by 5HT(1B/1D)agonist drugs but does not itself produce PPE. It has been suggested that 5HT(1B/1D)agonists may have an anti-migraine effect via inhibition of PPE in the dura mater. Avitriptan and CP122,288 both have strong binding affinities for 5HT(1B/1D)receptors, but only CP122,288 is a potent inhibitor of PPE. In this study we sought to compare the effects of CP122,288 and avitriptan on jugular vein CGRP release after stimulation of the superior sagittal sinus (SSS) in the cat. In eleven anaesthetized cats external jugular vein blood samples were analyzed by radioimmunoassay for CGRP levels in three settings: a) control, b) 1 min after SSS stimulation and c) 1 min after SSS stimulation in presence of drug. Stimulation of the SSS resulted in release of CGRP from the external jugular vein (77+/-1 pmol/L). At a PPE-inhibitory dose in rat (100 ng/kg intravenously) CP122, 288 had no effect on CGRP release (77+/-6 pmol/L) whereas at a clinically relevant dose (50 microgram/kg intravenously) avitriptan blocked CGRP release. This study demonstrates that the potent inhibitor of PPE, CP122, 288, which has been shown in clinical trials to be ineffective in treating acute migraine attacks, had no effect on CGRP release, whereas the effective anti-migraine drug and relatively impotent inhibitor of PPE, avitriptan, blocked CGRP release. These data emphasize the importance of CGRP release and its possible independence from PPE in migraine and more importantly suggest that other non-5HT-based pharmacological targets may account for PPE blockade in animal studies.

journal_name

Neuropeptides

journal_title

Neuropeptides

authors

Knight YE,Edvinsson L,Goadsby PJ

doi

10.1054/npep.1999.0009

keywords:

subject

Has Abstract

pub_date

1999-02-01 00:00:00

pages

41-6

issue

1

eissn

0143-4179

issn

1532-2785

pii

S0143-4179(99)90009-4

journal_volume

33

pub_type

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