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Submit ReviewAM 251 is a potent CB1 receptor antagonist (IC50 = 8 nM, Ki = 7.49 nM) that displays 306-fold selectivity over CB2 receptors. Also potent GPR55 agonist (EC50 = 39 nM) and μ-opioid receptor antagonist (Ki = 251 nM).
Fluorescent Form also available.
M. Wt | 555.24 |
Formula | C22H21Cl2IN4O |
Storage | Store at RT |
Purity | ≥99% (HPLC) |
CAS Number | 183232-66-8 |
PubChem ID | 2125 |
InChI Key | BUZAJRPLUGXRAB-UHFFFAOYSA-N |
Smiles | CC1=C(N(N=C1C(=O)NN1CCCCC1)C1=C(Cl)C=C(Cl)C=C1)C1=CC=C(I)C=C1 |
The technical data provided above is for guidance only. For batch specific data refer to the Certificate of Analysis.
Tocris products are intended for laboratory research use only, unless stated otherwise.
Solvent | Max Conc. mg/mL | Max Conc. mM | |
---|---|---|---|
Solubility | |||
ethanol | 13.88 | 25 | |
DMSO | 55.52 | 100 |
The following data is based on the product molecular weight 555.24. Batch specific molecular weights may vary from batch to batch due to the degree of hydration, which will affect the solvent volumes required to prepare stock solutions.
Concentration / Solvent Volume / Mass | 1 mg | 5 mg | 10 mg |
---|---|---|---|
1 mM | 1.8 mL | 9.01 mL | 18.01 mL |
5 mM | 0.36 mL | 1.8 mL | 3.6 mL |
10 mM | 0.18 mL | 0.9 mL | 1.8 mL |
50 mM | 0.04 mL | 0.18 mL | 0.36 mL |
References are publications that support the biological activity of the product.
Gatley et al (1996) 125I-labeled AM 251: a radioiodinated ligand which binds in vivo to mouse brain cannabinoid CB1 receptors. Eur.J.Pharmacol. 307 331 PMID: 8836622
Lan et al (1999) Structure-activity relationships of pyrazole derivatives as cannabinoid receptor antagonists. J.Med.Chem. 42 769 PMID: 10052983
Pertwee (2005) Inverse agonism and neutral antagonism at cannabinoid CB1 receptors. Life Sci. 76 1307 PMID: 15670612
Gatley et al (1997) Binding of the non-classical cannabinoid CP 55,940, and the diarylpyrazole AM251 to rodent brain cannabinoid receptors. Life Sci. 61 191 PMID: 9335234
Ryberg et al (2007) The orphan receptor GPR55 is a novel cannabinoid receptor. Br.J.Pharmacol. 152 1092 PMID: 17876302
Seely et al (2012) AM-251 and rimon. act as direct antagonists at mu-opioid receptors: implications for opioid/cannabinoid interaction studies. Neuropharmacology 63 905 PMID: 22771770
Ellermann et al (2020) Endocannabinoids inhibit the induction of virulence in enteric pathogens. Cell 183 650 PMID: 33031742
If you know of a relevant reference for AM 251, please let us know.
Keywords: AM 251, AM 251 supplier, Potent, CB1, antagonist, GPR55, agonist, cannabinoid, receptors, AM251, cb1r, Receptors, 1117, Tocris Bioscience
Citations are publications that use Tocris products. Selected citations for AM 251 include:
Tortoriello et al (2014) Miswiring the brain: △9-tetrahydrocannabinol disrupts cortical development by inducing an SCG10/stathmin-2 degradation pathway. Proc Natl Acad Sci U S A 33 668 PMID: 24469251
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Alpár et al (2014) Endocannabinoids modulate cortical development by configuring Slit2/Robo1 signalling. J Neurosci 5 4421 PMID: 25030704
Sreevalsan and Safe (2013) The cannabinoid WIN 55,212-2 decreases specificity protein transcription factors and the oncogenic cap protein eIF4E in colon cancer cells. Mol Cancer Ther 12 2483 PMID: 24030632
Wargent et al (2013) The cannabinoid δ(9)-tetrahydrocannabivarin (THCV) ameliorates Ins sensitivity in two mouse models of obesity. Nutr Diabetes 3 e68 PMID: 23712280
Chanda et al (2013) Hepatic cannabinoid receptor type 1 mediates alcohol-induced regulation of bile acid enzyme genes expression via CREBH. PLoS One 8 e68845 PMID: 23894352
Benz et al (2013) Expression and functional relevance of cannabinoid receptor 1 in Hodgkin lymphoma. PLoS One 8 e81675 PMID: 24349109
Malenczyk et al (2013) CB1 cannabinoid receptors couple to focal adhesion kinase to control Ins release. J Biol Chem 288 32685 PMID: 24089517
Abush and Akirav (2013) Cannabinoids ameliorate impairments induced by chronic stress to synaptic plasticity and short-term memory. Neuropsychopharmacology 38 1521 PMID: 23426383
Cao et al (2013) Cannabinoid HU210 protects isolated rat stomach against impairment caused by serum of rats with experimental acute pancreatitis. PLoS One 7 e52921 PMID: 23285225
Samineni et al (2011) Post-ictal analgesia in genetically epilepsy-prone rats is induced by audiogenic seizures and involves cannabinoid receptors in the periaqueductal gray. Brain Res 1389 177 PMID: 21439272
Segev and Akirav (2011) Differential effects of cannabinoid receptor agonist on social discrimination and contextual fear in amygdala and hippocampus. Learn Mem 18 254 PMID: 21447623
Guidali et al (2011) Cannabinoid CB1 receptor antagonism prevents neurochemical and behavioural deficits induced by chronic phencyclidine. Int J Neuropsychopharmacol 14 17 PMID: 20196921
Novellis et al (2011) The blockade of the transient receptor potential vanilloid type 1 and fatty acid amide hydrolase decreases symptoms and central sequelae in the medial prefrontal cortex of neuropathic rats. Mol Pain 7 7 PMID: 21241462
Ruby et al (2011) Acute overactive endocannabinoid signaling induces glucose intolerance, hepatic steatosis, and novel cannabinoid receptor 1 responsive genes. PLoS One 6 e26415 PMID: 22073164
Thompson and Perkel (2011) Endocannabinoids mediate synaptic plasticity at glutamatergic synapses on spiny neurons within a basal ganglia nucleus necessary for song learning. J Neurophysiol 105 1159 PMID: 21177997
Sousa et al (2011) Regulation of hippocampal cannabinoid CB1 receptor actions by adenosine A1 receptors and chronic caffeine administration: implications for the effects of δ9-tetrahydrocannabinol on spatial memory. Neuropsychopharmacology 36 472 PMID: 20927050
Negrete et al (2011) The antinociceptive effects of JWH-015 in chronic inflammatory pain are produced by nitric oxide-cGMP-PKG-KATP pathway activation mediated by opioids. PLoS One 6 e26688 PMID: 22031841
Hassanzadeh and Hassanzadeh (2011) The Role of the Endocannabinoids in Suppression of the Hypothalamic-pituitary-adrenal Axis Activity by dox. J Leukoc Biol 14 414 PMID: 23493814
Garzón et al (2009) Gz mediates the long-lasting desensitization of brain CB1 receptors and is essential for cross-tolerance with mor. Mol Pain 5 11 PMID: 19284549
Tjen-A-Looi et al (2009) Processing cardiovascular information in the vlPAG during electroacupuncture in rats: roles of endocannabinoids and GABA. J Appl Physiol (1985) 106 1793 PMID: 19325030
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Ellermann et al (2020) Endocannabinoids inhibit the induction of virulence in enteric pathogens. Cell PMID: 33031742
Merighi et al (2012) Cannabinoid CB(2) receptor attenuates morphine-induced inflammatory responses in activated microglial cells. Br J Pharmacol 166 2371 PMID: 22428664
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Pacheco et al (2009) Central antinociception induced by mu-opioid receptor agonist morphine, but not delta- or kappa-, is mediated by cannabinoid CB1 receptor. Br J Pharmacol 158 225 PMID: 19594755
Ho and Gardiner (2009) Acute hypertension reveals depressor and vasodilator effects of cannabinoids in conscious rats. Br J Pharmacol 156 94 PMID: 19133994
Vannacci et al (2004) The endocannabinoid 2-arachidonylglycerol decreases the immunological activation of Guinea pig mast cells: involvement of nitric oxide and eicosanoids. J Pharmacol Exp Ther 311 256 PMID: 15187170
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Diniz et al (2019) Dual mechanism of TRKB activation by anandamide through CB1 and TRPV1 receptors. PeerJ 7 e6493 PMID: 30809460
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Leroy et al (2017) Input-Timing-Dependent Plasticity in the Hippocampal CA2 Region and Its Potential Role in Social Memory. Neuron 95 1089 PMID: 28823730
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Baca et al (2013) Gene-environment interactions affect long-term depression (LTD) through changes in DA receptor affinity in Snap25 deficient mice. Brain Res 1532 85 PMID: 23939223
Duncan et al (2013) Cannabinoid 1 receptors are critical for the innate immune response to TLR4 stimulation. Am J Physiol Regul Integr Comp Physiol 305 R224 PMID: 23739343
Li et al (2013) Inhibition of fatty acid amide hydrolase activates Nrf2 signalling and induces heme oxygenase 1 transcription in breast cancer cells. Br J Pharmacol 170 489 PMID: 23347118
Peterfi et al (2012) Endocannabinoid-mediated long-term depression of afferent excitatory synapses in hippocampal pyramidal cells and GABAergic interneurons. J Neurosci 32 14448 PMID: 23055515
Sideris et al (2012) A Role for the Cannabinoid 1 Receptor in Neuronal Differentiation of Adult Spinal Cord Progenitors in vitro is Revealed through Pharmacological Inhibition and Genetic Deletion. Front Neurosci 6 4 PMID: 22291615
Tauber et al (2012) Regulation of MMP-9 by a WIN-binding site in the monocyte-macrophage system independent from cannabinoid receptors. PLoS One 7 e48272 PMID: 23139770
Giordano et al (2012) TRPV1-dependent and -independent alterations in the limbic cortex of neuropathic mice: impact on glial caspases and pain perception. Cereb Cortex 22 2495 PMID: 22139792
Laricchiuta et al (2012) Differences in spontaneously avoiding or approaching mice reflect differences in CB1-mediated signaling of dorsal striatal transmission. PLoS One 7 e33260 PMID: 22413007
Merighi et al (2012) Cannabinoid CB(2) receptors modulate ERK-1/2 kinase signalling and NO release in microglial cells stimulated with bacterial lipopolysaccharide. Br J Pharmacol 165 1773 PMID: 21951063
Losonczy et al (2010) Network mechanisms of theta related neuronal activity in hippocampal CA1 pyramidal neurons. Nat Neurosci 13 967 PMID: 20639875
Touriño et al (2010) THC Prevents MDMA Neurotoxicity in Mice. PLoS One 5 e9143 PMID: 20174577
Wamsteeker et al (2010) Repeated stress impairs endocannabinoid signaling in the paraventricular nucleus of the hypothalamus. J Neurosci 30 11188 PMID: 20720126
Huang et al (2010) A refractory period for rejuvenating GABAergic synaptic transmission and ocular dominance plasticity with dark exposure. J Neurosci 30 16636 PMID: 21148002
Godlewski et al (2010) Inhibitor of fatty acid amide hydrolase normalizes cardiovascular function in hypertension without adverse metabolic effects. Chem Biol 17 1256 PMID: 21095576
Zhang et al (2010) Cannabinoid CB1 receptor facilitation of substance P release in the rat spinal cord, measured as neurokinin 1 receptor internalization. Eur J Neurosci 31 225 PMID: 20074214
Hoffman et al (2010) Control of cannabinoid CB1 receptor function on glutamate axon terminals by endogenous adenosine acting at A1 receptors. J Neurosci 30 545 PMID: 20071517
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Berghuis et al (2005) Endocannabinoids regulate interneuron migration and morphogenesis by transactivating the TrkB receptor. Neurobiol Dis 102 19115 PMID: 16357196
Gaskari et al (2005) Role of endocannabinoids in the pathogenesis of cirrhotic cardiomyopathy in bile duct-ligated rats. Sci Rep 146 315 PMID: 16025138
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Galarreta et al (2004) Electrical coupling among irregular-spiking GABAergic interneurons expressing cannabinoid receptors. J Pharmacol Exp Ther 24 9770 PMID: 15525762
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King-Himmelreich (2017) AMPK contributes to aerobic exercise-induced antinociception downstream of endocannabinoids. Neuropharmacology 124 134 PMID: 28479394
Saliba (2017) AM404, paracetamol metabolite, prevents prostaglandin synthesis in activated microglia by inhibiting COX activity. J Neuroinflammation 14 246 PMID: 29237478
Zhang (2017) Orphan nuclear receptor ERRγ is a key regulator of human fibrinogen gene expression. PLoS One 12 e0182141 PMID: 28750085
Arrabal et al (2015) Pharmacological Blockade of Cannabinoid CB1 Receptors in Diet-Induced Obesity Regulates Mitochondrial Dihydrolipoamide Dehydrogenase in Muscle. PLoS One 10 e0145244 PMID: 26671069
Wang et al (2015) Activation of cannabinoid receptor 1 inhibits increased bladder activity induced by nerve growth factor. Neurosci Lett 589 19 PMID: 25575795
Bashashati et al (2015) Inhibiting endocannabinoid biosynthesis: a novel approach to the treatment of constipation. Br J Pharmacol 172 3099 PMID: 25684407
Parvathy and Masocha (2015) Coadministration of indomet. and MinCyc attenuates established PacT.-induced neuropathic thermal hyperalgesia: Involvement of cannabinoid CB1 receptors. J Neurosci 5 10541 PMID: 26085115
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Tumati et al (2012) Repeated mor. treatment-mediated hyperalgesia, allodynia and spinal glial activation are blocked by co-administration of a selective cannabinoid receptor type-2 agonist. J Neuroimmunol 244 23 PMID: 22285397
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Curto-Reyes et al (2010) Spinal and peripheral analgesic effects of the CB2 cannabinoid receptor agonist AM1241 in two models of bone cancer-induced pain. Br J Pharmacol 160 561 PMID: 20233215
Bhaskaran and Smith (2010) Effects of TRPV1 activation on synaptic excitation in the dentate gyrus of a mouse model of temporal lobe epilepsy. Endocrinology 223 529 PMID: 20144892
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Wang et al (2006) DArgic control of corticostriatal long-term synaptic depression in medium spiny neurons is mediated by cholinergic interneurons. Neuron 50 443 PMID: 16675398
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Laviolette (2006) Cannabinoids Potentiate Emotional Learning Plasticity in Neurons of the Medial Prefrontal Cortex through Basolateral Amygdala Inputs. J Neurosci 26 6458 PMID: 16775133
Nieri et al (2006) Modulation of P-glycoprotein activity by cannabinoid molecules in HK-2 renal cells. Br J Pharmacol 148 682 PMID: 16715117
Haj-Dahmane (2005) The wake-promoting peptide orexin-B inhibits glutamatergic transmission to dorsal raphe nucleus serotonin neurons through retrograde endocannabinoid signaling. J Neurosci 25 896 PMID: 15673670
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Ma et al (2015) Mitochondrial CB1 receptor is involved in ACEA-induced protective effects on neurons and mitochondrial functions. Sci Rep 5 12440 PMID: 26215450
Stornaiuolo et al (2015) Endogenous vs Exogenous Allosteric Modulators in GPCRs: A dispute for shuttling CB1 among different membrane microenvironments. Sci Rep 5 15453 PMID: 26482099
Kury et al (2014) Effects of the endogenous cannabinoid anandamide on voltage-dependent sodium and calcium channels in rat ventricular myocytes. Br J Pharmacol 171 3485 PMID: 24758718
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Cass et al (2014) CB1 cannabinoid receptor stimulation during adolescence impairs the maturation of GABA function in the adult rat prefrontal cortex. Mol Psychiatry 19 536 PMID: 24589887
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Jones et al (2010) Cannabidiol displays antiepileptiform and antiseizure properties in vitro and in vivo. Cereb Cortex 332 569 PMID: 19906779
Ho et al (2010) Endocannabinoid modulation of hyperaemia evoked by physiologically relevant stimuli in the rat primary somatosensory cortex. Neuropsychopharmacology 160 736 PMID: 20590576
Hao et al (2010) The cannabinoid WIN55,212-2 protects against oxidized LDL-induced inflammatory response in murine macrophages. Iran J Basic Med Sci 51 2181 PMID: 20305287
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Bátkai et al (2007) Endocannabinoids acting at CB1 receptors mediate the cardiac contractile dysfunction in vivo in cirrhotic rats. Br J Pharmacol 293 H1689 PMID: 17557913
Kelm et al (2007) Calcium release from presynaptic internal stores is required for ethanol to increase spontaneous γ-aminobutyric acid release onto cerebellum Purkinje neurons. PLoS One 323 356 PMID: 17652632
Ghasemi et al (2007) Role of the nitric oxide pathway and the endocannabinoid system in neurogenic relaxation of corpus cavernosum from biliary cirrhotic rats. EMBO J 151 591 PMID: 17486141
Rajesh et al (2007) Cannabinoid-2 receptor agonist HU-308 protects against hepatic ischemia/reperfusion injury by attenuating oxidative stress, inflammatory response, and apoptosis. Cardiovasc Res 82 1382 PMID: 17652447
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Derbenev et al (2006) Vanilloid-mediated heterosynaptic facilitation of inhibitory synaptic input to neurons of the rat dorsal motor nucleus of the vagus. PLoS One 26 9666 PMID: 16988037
Kurihara et al (2006) Effects of peripheral cannabinoid receptor ligands on motility and polarization in neutrophil-like HL60 cells and human neutrophils. Br J Pharmacol 281 12908 PMID: 16513651
Jayamanne et al (2006) Actions of the FAAH inhibitor URB597 in neuropathic and inflammatory chronic pain models. J Neurosci 147 281 PMID: 16331291
Miranda et al (2019) Cannabinoid Receptor 1 Blockade Attenuates Obesity and Adipose Tissue Type 1 Inflammation Through miR-30e-5p Regulation of Delta-Like-4 in Macrophages and Consequently Downregulation of Th1 Cells. Front Immunol 10 1049 PMID: 31134094
Hu et al (2019) Endocannabinoid Signaling Mediates Local Dendritic Coordination between Excitatory and Inhibitory Synapses. Cell Rep 27 666 PMID: 30995465
Nasrallah et al (2019) Routing Hippocampal Information Flow through Parvalbumin Interneuron Plasticity in Area CA2. Cell Rep 27 86 PMID: 30943417
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Hassanzadeh and Rostami (2014) CB1 cannabinoid receptors are involved in neuroleptic-induced enhancement of brain neurotensin. J Neurosci 17 181 PMID: 24847420
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Niu et al (2012) Effects of gonadal hormones on the peripheral cannabinoid receptor 1 (CB1R) system under a myositis condition in rats. J Pharmacol Exp Ther 153 2283 PMID: 22940464
Chanda et al (2012) Activation of cannabinoid receptor type 1 (Cb1r) disrupts hepatic Ins receptor signaling via cyclic AMP-response element-binding protein H (Crebh)-mediated induction of Lipin1 gene. Br J Pharmacol 287 38041 PMID: 22989885
Gonzalez-Islas et al (2012) Tonic and transient endocannabinoid regulation of AMPAergic miniature postsynaptic currents and homeostatic plasticity in embryonic motor networks. Sci Rep 32 13597 PMID: 23015449
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The key feature of drug addiction is the inability to stop using a drug despite clear evidence of harm. This poster describes the brain circuits associated with addiction, and provides an overview of the main classes of addictive drugs and the neurotransmitter systems that they target.