New Dopamine D2 Receptor Agonist, [3H]MCL-536, for Detecting Dopamine D2high Receptors in Vivo.

New Dopamine D2 Receptor Agonist, [3H]MCL-536, for Detecting Dopamine D2high Receptors in Vivo.
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新型多巴胺 D2 受体激动剂 [3H]MCL-536,用于检测体内多巴胺 D2high 受体。

DOI:
10.1021/acschemneuro.8b00096
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发表时间:
2018
影响因子:
5
通讯作者:
Neumeyer,JohnL
Neumeyer,JohnL
中科院分区:
医学3区
文献类型:
--
作者:
Subburaju,Sivan;Sromek,AnnaW;Seeman,Philip;Neumeyer,JohnL

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D2受体高亲和力状态的增加与某些神经系统疾病相关。我们合成并表征了高亲和力D2 high配体[3 H]MCL-536与D2/3激动剂R-(−)-N-n-丙基去甲阿扑吗啡(NPA)和D2/3拮抗剂雷氯必利的竞争结合。通过在表达人D2 long的CHO细胞中的饱和结合测定[3 H]MCL-536的总结合(减去存在100 nM NPA时的结合);数据产生可分离、非饱和非特异性和饱和特异性组分。前者代表NPA和[3 H]MCL-536共有的阿朴啡位点。后者表明特异性结合总D2受体(高和低亲和力状态)。[3 H]MCL-536的aKd为0.8 nM。在竞争结合中,NPA的aKi为0.16 nM,雷氯必利的aKi为0.9 nM。与鸟苷酰亚氨二磷酸共孵育消除了与D2 high的结合。这种独特的特征使放射性标记的MCL-536成为诊断和治疗的通用工具,并可在体内定量精神分裂症和PD患者中的D2 high位点。
Increases in the D2 receptor high affinity state are associated with certain neurological disorders. We synthesized and characterized the high-affinity D2high ligand [3H]MCL-536 in competition binding against the D2/3 agonistR-(−)-N-n-propylnorapomorphine (NPA) and the D2/3 antagonist raclopride. The total binding of [3H]MCL-536 (minus that in the presence of 100 nM NPA) was measured by saturation binding in CHO cells expressing human D2long; the data yielded separable, nonsaturable nonspecific, and saturable specific components. The former represents an aporphine site common to NPA and [3H]MCL-536. The latter indicated specific binding to the total D2 receptors (both high and low-affinity states). [3H]MCL-536 had aKdof 0.8 nM. In competition binding, NPA had aKiof 0.16 nM, and raclopride had aKiof 0.9 nM. Co-incubation with guanylylimidodiphosphate abolished binding to D2high. This unique profile makes radiolabeled MCL-536 a versatile tool for diagnostics and therapeutics, and may quantify D2high sites in schizophrenia and PD patients in vivo.
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