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CGP 55845 hydrochloride GABAB receptor antagonist

Catalog No.B5086
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Sample solution is provided at 25 µL, 10mM.

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Chemical structure

CGP 55845 hydrochloride

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Chemical Properties

Cas No. 149184-22-5 SDF Download SDF
Chemical Name benzyl((S)-3-(((S)-1-(3,4-dichlorophenyl)ethyl)amino)-2-hydroxypropyl)phosphinic acid hydrochloride
Canonical SMILES C[[email protected]@](NC[[email protected]@](O)([H])CP(CC1=CC=CC=C1)(O)=O)([H])C2=CC(Cl)=C(Cl)C=C2.Cl
Formula C18H22Cl2NO3P.HCl M.Wt 438.71
Solubility Soluble in DMSO > 10 mM Storage Store at RT
Physical Appearance White solid Shipping Condition Evaluation sample solution : ship with blue ice.All other available size: ship with RT , or blue ice upon request
General tips For obtaining a higher solubility , please warm the tube at 37 ℃ and shake it in the ultrasonic bath for a while.Stock solution can be stored below -20℃ for several months.


IC50: 5 nM

CGP 55845 is a potent, selective GABAB receptor antagonist that abolishes agonist binding (pKi = 8.35) and blocks GABA and glutamate release (pEC50 values are 8.08 and 7.85 respectively). CGP 55845 prevents GABAB responses to baclofen (IC50 = 130 nM in an isoproterenol assay) and increases the hypoglycemic response to glucose in vitro. [1,2]

Presynaptic GABAB receptors seem to regulate the release of several neurotransmitters. Baclofen, the GABAB agonist, that prevents the release of GABA itself via autoreceptors, was 10 times more potent in antagonizing the inhibitory effect of (-)-baclofen on the release of GABA and of somatostatin-like immunoreactivity (SRIF-LI) than of glutamate. However, CGP 35348 was about 70 times more potent in preventing the effect of baclofen on glutamate and SRIF-LI than on GABA release.

In vitro: Antagonist CGP 55845A of the GABAB receptor in the presence of CNQX and d(2)-2-amino-5-phosphonovaleric acid prevented the inhibitory postsynaptic potential-B and paired-pulse depression. [3].

This secretion was cadmium sensitive, potentiated by CGP 55845, and blocked by ketanserin. Taken together these data suggest that CB receptors act as direct glucosensors, and that processing of hypoglycaemia utilizes similar neurotransmitter and neuromodulatory mechanisms as hypoxia [4]. The convulsant 4-aminopyridine (4-AP) and the GABAB receptor antagonist CGP 55845 both applied to adult guinea pig hippocampal to slices, resulting in eliciting giant GABA-mediated postsynaptic potentials (GPSPs) and epileptiform discharges. [5].

In vivo: So far, no study in vivo has been conducted.

Clinical trial: So far, no clinical study has been conducted.

[1] Waldmeier PC, Wicki P, Feldtrauer JJ, Mickel SJ, Bittiger H, Baumann PA.  GABA and glutamate release affected by GABAB receptor antagonists with similar potency: no evidence for pharmacologically different presynaptic receptors. Br J Pharmacol. 1994 Dec;113(4):1515-21.
[2] Cunningham MD, Enna SJ.  Evidence for pharmacologically distinct GABAB receptors associated with cAMP production in rat brain. Brain Res. 1996 May 13;720(1-2):220-4.
[3] Deisz RA.  The GABA(B) receptor antagonist CGP 55845A reduces presynaptic GABA(B) actions in neocortical neurons of the rat in vitro. Neuroscience. 1999;93(4):1241-9.
[4] Zhang M, Buttigieg J, Nurse CA.  Neurotransmitter mechanisms mediating low-glucose signalling in cocultures and fresh tissue slices of rat carotid body. J Physiol. 2007 Feb 1;578(Pt 3):735-50. Epub 2006 Nov 23.
[5] Salah A, Perkins KL.  Effects of subtype-selective group I mGluR antagonists on synchronous activity induced by 4-aminopyridine/CGP 55845 in adult guinea pig hippocampal slices. Neuropharmacology. 2008 Jul;55(1):47-54. doi: 10.1016/j.neuropharm.2008.04.010. Epub 2008 Apr 23.