A positron emission tomography (PET) tracer for the enzyme phosphodiesterase 10A (PDE10A) is desirable to guide the discovery and development of PDE10A inhibitors as potential therapeutics. The preclinical characterization of the PDE10A PET tracer [11C]MK-8193 is described. In vitro binding studies with [3H]MK-8193 were conducted in rat, monkey, and human brain tissue. PET studies with [11C]MK-8193 were conducted in rats and rhesus monkeys at baseline and following administration of a PDE10A inhibitor. [3H]MK-8193 is a high-affinity, selective PDE10A radioligand in rat, monkey, and human brain tissue. In vivo, [11C]MK-8193 displays rapid kinetics, low test-retest variability, and a large specific signal that is displaced by a structurally diverse PDE10A inhibitor, enabling the determination of pharmacokinetic/enzyme occupancy relationships. [11C]MK-8193 is a useful PET tracer for the preclinical characterization of PDE10A therapeutic candidates in rat and monkey. Further evaluation of [11C]MK-8193 in humans is warranted.
磷酯酶 10A (PDE10A)的正电子发射断层扫描(PET)示踪剂是指导发现和开发 PDE10A
抑制剂作为潜在疗法的理想选择。本文描述了 PDE10A PET 示踪剂 [11C]MK-8193 的临床前特征。在大鼠、猴子和人类脑组织中进行了[3H]MK-8193的体外结合研究。在大鼠和恒河猴的基线和服用 PDE10A
抑制剂后,进行了 [11C]MK-8193 的 PET 研究。[3H]MK-8193在大鼠、猴子和人类脑组织中是一种高亲和性、选择性的PDE10A放射性
配体。在体内,[11C]MK-8193 显示出快速的动力学、较低的测试重复变异性以及被结构多样的 PDE10A
抑制剂取代的较大特异性信号,从而能够确定药代动力学/酶占位关系。[11C]MK-8193是一种有用的PET示踪剂,可用于大鼠和猴子PDE10A候选疗法的临床前表征。有必要在人体中进一步评估 [11C]MK-8193 的效果。