| Bioactivity | (R)-(-)-α-Methylhistamine dihydrochloride is a potent, selective and brain-penetrant agonist of H3 histamine receptor, with a Kd of 50.3 nM[1][2]. (R)-(-)-α-Methylhistamine dihydrochloride can enhance memory retention, attenuates memory impairment in rats[3][4][5]. |
| Invitro | (R)-(-)-α-Methylhistamine dihydrochloride is an H3-agonist that is >10 times as potent as histamine (HA). Its selectivity toward H3-receptors is >1000 times as high as that of HA. (R)-(-)-α-Methylhistamine dihydrochloride has only weak affinities for H1 and H2 receptor with a pKi=4.8 and 200-fold selectivity over H4 receptors[1][2][3]. |
| In Vivo | Pretreatment with (R)-(-)-α-Methylhistamine dihydrochloride (RAMH; 10 mg/kg; i.p.; 60 min before training) reverses Propofol‐induced (25 mg/kg; i.p.; 30 min before training) memory retention[5]. (R)-(-)-α-Methylhistamine dihydrochloride (6.3 mg/kg; i.p.) significantly decreases the steady-state t-MH level in the mouse brain, whereas these compounds produced no significant changes in the HA level[3]. Animal Model: |
| Name | (R)-(-)-α-Methylhistamine dihydrochloride |
| CAS | 75614-89-0 |
| Formula | C6H13Cl2N3 |
| Molar Mass | 198.09 |
| Appearance | Solid |
| Transport | Room temperature in continental US; may vary elsewhere. |
| Storage | 4°C, sealed storage, away from moisture *In solvent : -80°C, 6 months; -20°C, 1 month (sealed storage, away from moisture) |
| Reference | [1]. Arrang JM, et al. Highly potent and selective ligands for histamine H3-receptors. Nature. 1987 May 14-20;327(6118):117-23. [2]. Mohammad Shahid, et al. Histamine, Histamine Receptors, and their Role in Immunomodulation: An Updated Systematic Review. The Open Immunology Journal, 2009, 2, 9-41. [3]. Oishi R, et al. Effects of the histamine H3-agonist (R)-alpha-methylhistamine and the antagonist thioperamideon histamine metabolism in the mouse and rat brain. J Neurochem. 1989 May;52(5):1388-92. [4]. Yamasaki S, et al. The disposition of (R)-alpha-methylhistamine, a histamine H3-receptor agonist, in rats. J Pharm Pharmacol. 1994 May;46(5):371-4. [5]. Li WW, et al. (R)-alpha-methylhistamine suppresses inhibitory neurotransmission in hippocampal CA1 pyramidal neurons counteracting propofol-induced amnesia in rats. CNS Neurosci Ther. 2014 Sep;20(9):851-9. |
(R)-(-)-α-Methylhistamine dihydrochloride
CAS: 75614-89-0 F: C6H13Cl2N3 W: 198.09
(R)-(-)-α-Methylhistamine dihydrochloride is a potent, selective and brain-penetrant agonist of H3 histamine receptor,
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