Abstract
1. We describe the effects of pretreatment with 5-hydroxytryptamine (5-HT) receptor agonists and antagonists on neurogenically-mediated plasma protein extravasation ([125I]-albumin) in rat dura mater and in extracranial tissues (temporalis muscle fascia, conjunctiva, eyelid and lip) induced by electrical stimulation of the right trigeminal ganglion. 2. Leakage of [125I]-bovine serum albumin from blood vessels in dura mater following high intensity stimulation (1.2 mA, 5 ms, 5 Hz for 5 min) was significantly reduced by the intravenous administration of drugs active at 5-HT receptors with some selectivity for the 5-HT1 receptor subtypes: 5-carboxamidotryptamine (5-CT) (threshold dose, 1 ng kg-1); 5-benzyloxytryptamine (5-BT) (10, 30 or 100 micrograms kg-1); 8-hydroxydipropylaminotetralin (8-OH-DPAT) (300 micrograms kg-1); and as previously reported, sumatriptan (100 micrograms kg-1), dihydroergotamine (DHE) (50 micrograms kg-1); ergotamine tartrate (100 micrograms kg-1) and chronically administered methysergide (1 mg kg-1). 3. The putative 5-HT receptor antagonist, metergoline 100 micrograms kg-1, inhibited partially the effect of sumatriptan in dura mater providing additional evidence for a 5-HT1 receptor subtype-mediated mechanism, although it was not effective against 5-CT (1 ng kg-1). Methiothepin (300 micrograms kg-1) did not affect the response to sumatriptan. When administered at high concentrations (1 mg kg-1) methiothepin and metergoline decreased plasma protein extravasation in rat dura mater.(ABSTRACT TRUNCATED AT 250 WORDS)
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