Toreforant is a potent and selective histamine H₄ receptor (H4R) antagonist, with a K_i at the human receptor of 8.4 nM.

In human polymorphonuclear leukocytes, Toreforant inhibits the histamine-induced shape change of human eosinophils and produces a rightward shift in the histamine dose response curves indicating that it is acting as an antagonist of the human H4R in these primary cells. This is not an equilibrium measurement and therefore the calculation of a pA2 is complicated. The pA2 can be estimated using the shift seen the lowest concentration of antagonist. This yields a pA2 of around 7.5 consistent with the results in the transfected system. This assay can also be performed in whole blood and, as for the purified cells, Toreforant is able to inhibit the actions of histamine. The IC₅₀ values are 296 nM and 780 nM when 100 nM and 300 nM histamine are used, respectively^[1].

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

The animals treated with 100 mg/kg toreforant have reduced disease severity scores. The reduction in scores is similar to JNJ 28307474. A model of histamine-induced scratching in CD-1 mice (n=5 per group) is used to judge the anti-pruritic effects of Toreforant. Unlike other H4R antagonists, Toreforant is not efficacious in reducing histamine-mediated pruritus. After oral administration to rats, Toreforant-derived radioactivity is widely distributed into tissues; however, it is not quantifiable in cerebellum, cerebrum, medulla, and spinal cord in either Long Evans or Sprague Dawley rats, suggesting that drug-derived radioactivity does not cross the blood-brain barrier. Neuropathic pain models in rats are conducted with Toreforant and an H4R antagonist that does cross the blood-brain barrier, JNJ 39758979. In a rat spinal nerve ligation model JNJ 39758979 was able to significantly attenuate the mechanical allodynia induced in the model, however Toreforant has no activity^[1].

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

392.54

C₂₃H₃₂N₆

952494-46-1

Solid

Off-white to light yellow

CN1CCC(CCCNC2=NC=C(C3=NC4=CC(C)=CC(C)=C4N3)C(C)=N2)CC1

Room temperature in continental US; may vary elsewhere.

4°C, sealed storage, away from moisture and light

*In solvent : -80°C, 6 months; -20°C, 1 month (sealed storage, away from moisture and light)

* Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles.
Storage method and period of stock solution: -80°C, 6 months; -20°C, 1 month (sealed storage, away from moisture and light). When stored at -80°C, please use it within 6 months. When stored at -20°C, please use it within 1 month.

• [1]. Robin L Thurmond, Pharmacology and Clinical Activity of Toreforant, a Histamine H4 Receptor Antagonist. Annals of Pharmacology and Pharmaceutics. 21 Jan, 2017.