Protein Information

ID 4667
Name alpha 2 adrenergic receptors (protein family or complex)
Synonyms Alpha adrenoceptor; Alpha adrenoceptor; Alpha adrenergic receptor; Alpha adrenergic receptors; Alpha adrenoceptors; Alpha adrenoceptors; alpha1 Adrenoceptors; alpha1 Adrenoceptor…

Compound Information

ID 336
Name strychnine
CAS strychnidin-10-one

Reference

PubMed Abstract RScore(About this table)
9671104 Garcia MC, Celuch SM, Adler-Graschinsky E: Involvement of GABA and glutamate receptors in the blood pressure responses to intrathecally injected sodium nitroprusside in anesthetized rats. Eur J Pharmacol. 1998 May 22;349(2-3):245-52.
In pentobarbital-anesthetized rats the intrathecal (i.t.) injection of the nitric oxide (NO) donor, sodium nitroprusside (125, 250 and 500 nmol), induced a dose-dependent hypotensive response followed by a dose-dependent pressor effect. The pressor response to sodium nitroprusside (250 nmol) was reduced to 30% of the control value by the selective antagonist for AMPA/kainate receptors, 6.7-dinitroquinoxaline-2,3-dione (50 nmol, i.t.), whereas it was not modified by the selective NMDA receptor antagonist, 2-amino-5-phosphono-valeric acid (30 nmol, i.t.). The hypotensive effect of sodium nitroprusside was antagonized by the GABA (A) receptor antagonists, bicuculline (4.4 nmol, i.t.) and picrotoxin (4.4 nmol, i.t.), and also by the GABA (B) receptor antagonist, 2-hydroxy saclofen (113 nmol, i.t.). The blood pressure responses to sodium nitroprusside were not modified by blockade of muscarinic receptors with methyl atropine (164 nmol, i.t.), or of nicotinic receptors with hexamethonium (211 nmol, i.t.), of alpha1-adrenoceptors with prazosin (3.1 nmol, i.t.), of alpha2-adrenoceptors with yohimbine (2.8 micromol/kg, i.v.), of 5-HT receptors with methysergide (5.1 micromol/kg, i.v.), or of glycine receptors with strychnine (65 nmol, i.t.). It is concluded that NO generated from sodium nitroprusside in the spinal cord exerts inhibitory and excitatory effects on blood pressure probably through the release of GABA and glutamate, respectively. The inhibitory action on blood pressure involves the stimulation of spinal GABA (A) and GABA (B) receptors whereas the excitatory response to glutamate appears to be mediated through the activation of spinal AMPA/kainate receptors.
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