Synthesis, radiofluorination, and in vitro evaluation of pyrazolo[1,5-a]pyridine-based dopamine D4 receptor ligands: discovery of an inverse agonist radioligand for PET.

Synthesis, radiofluorination, and in vitro evaluation of pyrazolo[1,5-a]pyridine-based dopamine D4 receptor ligands: discovery of an inverse agonist radioligand for PET.
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基于吡唑并[1,5-a]吡啶的多巴胺 D4 受体配体的合成、放射性氟化和体外评价:PET 反向激动剂放射性配体的发现

DOI:
10.1021/jm701375u
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发表时间:
2008
影响因子:
7.3
通讯作者:
Gmeiner P.
Gmeiner P.
中科院分区:
医学1区
文献类型:
--
作者:
Prante 0;Tietze R;Hocke C;Löber S;Hübner H;Kuwert T;Gmeiner P.

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合成了一系列结构上衍生自氨甲基取代的吡唑并[1,5-a]吡啶先导化合物9(FAUC 113)和10(FAUC 213)的氟取代类似物,并将其作为高亲和力D4受体(D4 R)配体(3a− 3 h,Ki= 1.3-28 nM)进行评价。对氟乙氧基取代的衍生物3f和3 h显示出超过3个数量级的D4亚型选择性,超过同类物D2和D3,并在D4 R处具有反向激动作用。相应的18F标记的放射性配体显示出高的体外血清稳定性和2-3的logP值。体外大鼠脑放射自显影显示[18 F] 3在不同脑区(包括海马齿状回)的特异性结合,受到依替氯必利(65-80%)和选择性D4 R拮抗剂10(78-93%)的抑制。观察到的结合模式主要与大鼠脑中已知的D4 R分布一致。因此,[18 F] 3 h(FAUC F41)代表了一种潜在的放射性配体,用于通过正电子发射断层扫描(PET)在体内研究D4 R。
A series of fluoro-substituted analogs structurally derived from the aminomethyl-substituted pyrazolo[1,5-a]pyridine lead compounds9(FAUC 113) and10(FAUC 213) were synthesized and evaluated as high-affinity D4receptor (D4R) ligands (3a−3h,Ki= 1.3–28 nM). Thepara-fluoroethoxy-substituted derivatives3fand3hrevealed an outstanding D4subtype selectivity of more than 3 orders of magnitude over both congeners D2and D3combined with inverse agonism at D4R. The corresponding18F-labeled radioligands revealed high serum stability in vitro and logPvalues of 2–3. In vitro rat brain autoradiography showed specific binding of[18F]3hin distinct brain regions, including the gyrus dentate of the hippocampus, that were inhibited by both eticlopride (65–80%) and the selective D4R antagonist10(78–93%). The observed binding pattern was mainly consistent with the known D4R distribution in the rat brain. Thus,[18F]3h(FAUC F41) represents a potential radioligand for studying the D4R in vivo by positron emission tomography (PET).
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