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IC50: A Histamine H4 receptor antagonist with IC50 of 4.5 nM.

Histamine has been reported to play an important role in a large number of physiological processes. JNJ-7777120, the first potent and selective non-imidazole histamine H4 receptor antagonist with Ki of 4.5 nM, exhibits more than 1000-fold selectivity over the other histamine receptors. [1]

In vitro: It was reported that NJ 7777120 bound to the H4 receptor with a remarkably high affinity. It also demonstrated a greater selectivity over other histamine receptor antagonists. Moreover, JNJ 7777120 selectively targeted to potent H4 rather than 50 other molecular targets. [2]

In vivo: JNJ 7777120 showed an oral bioavailability of about 30% in rats and 100% in dogs, with a half-life of around 3 h in both rats and dogs. It was reported to inhibit histamine-induced chemotaxis and calcium influx in mouse bone marrow-derived mast cells. In addition, in mice, JNJ 7777120 could suppress the histamine-induced migration of tracheal mast cells from the connective tissue to the epithelium. Moreover, JNJ 7777120 was demonstrated to notably inhibit neutrophil infiltration in a mouse zymosan-induced peritonitis model. [2]

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

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