ONO-2952 是一种有效的，选择性的，口服活性的移位蛋白 18 kDa (TSPO) 拮抗剂，对大鼠和人 TSPO 的 Ki 值为 0.330-9.30 nM。与其他受体，转运蛋白，离子通道和酶相比，ONO-2952 对 TSPO 的选择性更高。ONO-2952 通过抑制大脑中的去甲肾上腺素能系统的过度激活而发挥其抗应激作用，并且不消除记忆。ONO-2952 可用于肠易激综合症。
ONO-2952 is a potent, selective and orally active translocator protein 18 kDa (TSPO) antagonist with Ki of 0.33-9.30 nM for rat and human TSPO. ONO-2952 is more selective for TSPO than other receptors, transporters, ion channels and enzymes. ONO-2952 exerts its anti-stress effects through inhibition of excessive activation of noradrenergic system in the brain without the amnesic effect. ONO-2952 has the potential for irritable bowel syndrome treatment[1][2].
As for its selectivity for TSPO, ONO-2952 at a concentration of 10 μM showed good selectivity for TSPO against 98 off-targets (<50% inhibition). Determination of ONO-2952 Ki or IC50 values for the remaining 35 targets (50% inhibition at 10 μM) reveal Ki values of less than 1 μM only for 3 receptors, i.e. melatonin 2, progesterone B, and adrenergic α2C. The affinity of ONO-2952 for these receptors is at least 59 times lower than that for TSPO. ONO-2952 Ki value for the GABAA receptor is more than 600 times higher than that for TSPO[1].
ONO-2952 (0.03-3 mg/kg; oral administration; male Sprague Dawley rats) treatment dose-dependently suppresses restraint stress-induced defecation in rats with brain TSPO occupancy of more than 50%. ONO-2952 also suppresses conditioned fear stress-induced freezing behavior in rats[1].ONO-2952 inhibits both neurosteroid accumulation and noradrenaline release in the brain of rats exposed to acute stress[1].
[1]. Mitsui K, et al. Anti-stress effects of ONO-2952, a novel translocator protein 18 kDa antagonist, in rats. Neuropharmacology. 2015 Dec;99:51-66.
[2]. Whitehead WE, et al. Randomised clinical trial: exploratory phase 2 study of ONO-2952 in diarrhoea-predominant irritable bowel syndrome. Aliment Pharmacol Ther. 2017 Jan;45(1):14-26.
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