3-Bromocytisine - CAS 207390-14-5
Category: Inhibitor
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Molecular Weight:
3-Bromocytisine has been found to be an α4β4, α4β2 and α7 nACh receptor agonist.
≥98% by HPLC
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1.Nicotinic acetylcholine receptors containing the α7-like subunit mediate contractions of muscles responsible for space positioning of the snail, Helix pomatia L. tentacle.
Kiss T;Krajcs N;Pirger Z;Hernádi L PLoS One. 2014 Oct 10;9(10):e109538. doi: 10.1371/journal.pone.0109538. eCollection 2014.
Three recently discovered tentacle muscles are crucial to perform patterned movements of upper tentacles of the terrestrial snail, Helix pomatia. The muscles receive central and peripheral excitatory cholinergic innervation lacking inhibitory innervation. Here, we investigate the pharmacology of acetylcholine (ACh) responses in muscles to determine the properties of the ACh receptor (AChR), the functional availability of which was assessed using isotonic contraction measurement. Using broad spectrum of nicotinic and muscarinic ligands, we provide the evidence that contractions in the muscles are attributable to the activation of nAChRs that contain the α7-like subunit. Contractions could be evoked by nicotine, carbachol, succinylchloride, TMA, the selective α7-nAChR agonist choline chloride, 3-Bromocytisine and PNU-282987, and blocked by nAChR selective antagonists such as mytolon, hexamethonium, succinylchloride, d-tubocurarine, hemicholinium, DMDA (decamethonium), methyllycaconitine, α-Bungarotoxin (αBgTx) and α-Conotoxin IMI. The specific muscarinic agonist oxotremorine and arecoline failed to elicit contractions. Based on these pharmacological properties we conclude that the Na+ and Ca2+ permeable AChRs of the flexor muscle are nicotinic receptors that contain the α7-like subunit.
2.In vivo modulation of dopaminergic nigrostriatal pathways by cytisine derivatives: implications for Parkinson's Disease.
Abin-Carriquiry JA;Costa G;Urbanavicius J;Cassels BK;Rebolledo-Fuentes M;Wonnacott S;Dajas F Eur J Pharmacol. 2008 Jul 28;589(1-3):80-4. doi: 10.1016/j.ejphar.2008.05.013. Epub 2008 May 20.
Nicotinic acetylcholine receptor agonists are considered potential pharmacological agents for Parkinson's disease treatment, due to their ability to improve experimental Parkinson symptomatology, reduce 3,4-dihydroxy-L-phenylalanine-induced dyskinesias and stop the neurodegenerative process at an experimental level. In the present work, the ability of the nicotinic agonist cytisine and two halogenated derivatives (3-bromocytisine and 5-bromocytisine) to induce striatal dopamine release was characterized in vivo by microdialysis. Cytisine, 5-bromocytisine and nicotine were much more efficacious than 3-bromocytisine in eliciting dopamine release in response to their local application through the microdialysis probe. Moreover, the agonists were intermittently administered before and after an intranigral injection of 6-hydroxydopamine (6-OHDA), and striatal dopamine tissue levels were assessed 8 days after the lesion. Both cytisine and its 5-bromo derivative (but not the 3-bromo derivative) significantly prevented the decrease of striatal dopamine tissue levels induced by 6-OHDA. These results suggest that the efficacy of nicotinic agonists to stimulate dopamine release in vivo through presynaptic nicotinic receptors could be related to their potential to induce striatal protection.
3.Electrophysiological characterization of nicotinic acetylcholine receptors in cat petrosal ganglion neurons in culture: effects of cytisine and its bromo derivatives.
Varas R;Valdés V;Iturriaga-Vásquez P;Cassels BK;Iturriaga R;Alcayaga J Brain Res. 2006 Feb 9;1072(1):72-8. Epub 2006 Jan 9.
Petrosal ganglion neurons are depolarized and fire action potentials in response to acetylcholine and nicotine. However, little is known about the subtype(s) of nicotinic acetylcholine receptors involved, although alpha4 and alpha7 subunits have been identified in petrosal ganglion neurons. Cytisine, an alkaloid unrelated to nicotine, and its bromo derivatives are agonists exhibiting different affinities, potencies and efficacies at nicotinic acetylcholine receptors containing alpha4 or alpha7 subunits. To characterize the receptors involved, we studied the effects of these agonists and the nicotinic acetylcholine receptor antagonists hexamethonium and alpha-bungarotoxin in isolated petrosal ganglion neurons. Petrosal ganglia were excised from anesthetized cats and cultured for up to 16 days. Using patch-clamp technique, we recorded whole-cell currents evoked by 5-10 s applications of acetylcholine, cytisine or its bromo derivatives. Agonists and antagonists were applied by gravity from a pipette near the neuron surface. Neurons responded to acetylcholine, cytisine, 3-bromocytisine and 5-bromocytisine with fast inward currents that desensitized during application of the stimuli and were reversibly blocked by 1 microM hexamethonium or 10 nM alpha-bungarotoxin.
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CAS 207390-14-5 3-Bromocytisine

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