[³⁵S]GTPγS binding assays are performed. CHO-K1 cells stably expressing the human H₃ receptor (~400 fmol/mg protein) are homogenized in ice-cold buffer (50 mM Tris/HCl, pH 7.4). Homogenates are centrifuged twice (20,000g for 10 min at 4°C), and the final pellet is resuspended in 50 volumes of buffer. Membranes (550 μg of protein) are pretreated with adenosine deaminase (1 U/mL) and incubated for 60 min at 25°C with 0.1 nM [³⁵S]GTPγS and the drugs to be tested in a final volume of 1 mL of assay buffer (50 mM Tris/HCl, 50 mM NaCl, 5 mM MgCl₂, 10 μM GDP, and 0.02% bovine serum albumin, pH 7.4). The nonspecific binding is determined using 10 μM nonradioactive GTPγS. Incubations are stopped by rapid filtration under vacuum through GF/B glass fiber filters. After washing with ice-cold water, the radioactivity trapped on filters is counted by liquid scintillation spectrometry. A similar assay is used to assess competitive antagonism. In brief, membranes (10 μg of protein) of HEK-293 cells stably expressing the human H₃ receptor (~600 fmol/mg protein) are preincubated in presence of Pitolisant in the buffer (50 mM Tris/HCl, pH 7.4, 10 mM MgCl₂, 100 mM NaCl, and 10 μM GDP) in a 96-well microplate under gentle agitation at room temperature (19-20°C) for 30 min before the addition of 0.1 nM [³⁵S]GTPγS (final volume 200 μL). The nonspecific binding is determined using a 10 μM concentration of nonradioactive GTPγS. After 30 min, incubations performed in triplicate are stopped by rapid filtration under vacuum on a Multiscreen MAFCOB50 microplate. Radioactivity trapped on filters is counted by liquid scintillation spectrometry^[1].

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

Mice^[2]
Adult female Albino Swiss mice weighing 20-22 g are used in the study. LY170053 or Pitolisant are suspended in 1 % Tween 80. The compounds or vehicle are administered intraperitoneally (i.p.) 30 min prior to the acute experiment. In the Pitolisant+LY170053 group, Pitolisant is administered 15 min before LY170053. Subchronic treatment is done at about 9:00 am (0.2 mL Tween to control group, Pitolisant-10 mg/kg b.w. to Pitolisant group, LY170053-2 mg/kg b.w. to LY170053 group, Pitolisant-10 mg/kg b.w. and LY170053 after 15 min-2 mg/kg b.w. to Pitolisant+LY170053 group) and at about 1:00 pm (LY170053 group and Pitolisant+LY170053 group).
Rats^[3]
Male Wistar rats (220-300 g) receive vehicle (methylcellulose 1%, p.o.), and Pitolisant (10 mg/kg, p.o.). Ninety minutes later, they are killed by decapitation and nucleus accumbens are dissected out, weighed, frozen in liquid nitrogen and stored at -80°C. Tissues are homogenized in 1 mL of a 0.4 N perchloric acid/2.7 mM EDTA solution. After centrifugation (8000 rpm, 20 min, 4°C), supernatants are analysed by HPLC coupled to electrochemical detection.

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

• [1]. Ligneau X, et al. BF2.649 [1-{3-[3-(4-Chlorophenyl)propoxy]propyl}piperidine, hydrochloride], a nonimidazole inverse agonist/antagonist at the human histamine H3 receptor: Preclinical pharmacology. J Pharmacol Exp Ther. 2007 Jan;320(1):365-75.  [Content Brief]

  [2]. Dudek M, et al. H3 histamine receptor antagonist pitolisant reverses some subchronic disturbances induced by LY170053 in mice. Metab Brain Dis. 2016 Oct;31(5):1023-9.  [Content Brief]

  [3]. Uguen M, et al. Preclinical evaluation of the abuse potential of Pitolisant, a histamine H? receptor inverse agonist/antagonist compared with CRL 40476. Br J Pharmacol. 2013 Jun;169(3):632-44.  [Content Brief]