用于正电子发射断层扫描 (PET) 的腺苷受体 (AR) 放射性示踪剂提供了关于AR 在中枢神经系统 (CNS)中的体内生物分布的知识,这对各种神经精神疾病具有治疗意义。此外,仍然缺乏能够成像不同生理和病理条件下内源性腺苷水平变化的放射性配体。在啮齿动物 PET 研究中,已知拮抗剂腺苷 A 1受体 (A 1 R) 放射性示踪剂 [ 11 C]MDPX 的结合未能被升高的内源性腺苷抑制。由于大多数已知的 AR PET 放射性示踪剂都是拮抗剂,我们建议 A 1R 激动剂放射性配体可能对测量内源性腺苷浓度的变化具有更高的灵敏度。在此,我们报告了我们在开发用于 PET 的完全激动剂腺苷 A 1放射性配体方面的最新发现。基于 3,5-二氰基吡啶模板,设计和合成了 16 种新衍生物以优化结合亲和力和功能活性,从而产生了两种具有单位数纳摩尔亲和力和良好亚型选择性的完全激动剂(化合物27和29 )(A 1
Structure−Activity Relationship Study of Prion Inhibition by 2-Aminopyridine-3,5-dicarbonitrile-Based Compounds: Parallel Synthesis, Bioactivity, and in Vitro Pharmacokinetics
作者:Barnaby C. H. May、Julie A. Zorn、Juanita Witkop、John Sherrill、Andrew C. Wallace、Giuseppe Legname、Stanley B. Prusiner、Fred E. Cohen
DOI:10.1021/jm061045z
日期:2007.1.1
2-Aminopyridine-3,5-dicarbonitrile compounds were previously identified as mimetics of dominant-negative prion protein mutants and inhibit prion replication in cultured cells. Here, we report findings from a comprehensive structure-activityrelationshipstudy of the 6-aminopyridine-3,5-dicarbonitrile scaffold. We identify compounds with significantly improved bioactivity (approximately 40-fold) against
New, Non-Adenosine, High-Potency Agonists for the Human Adenosine A<sub>2B</sub> Receptor with an Improved Selectivity Profile Compared to the Reference Agonist <i>N</i>-Ethylcarboxamidoadenosine
作者:Margot W. Beukers、Lisa C. W. Chang、Jacobien K. von Frijtag Drabbe Künzel、Thea Mulder-Krieger、Ronald F. Spanjersberg、Johannes Brussee、Ad P. IJzerman
DOI:10.1021/jm049947s
日期:2004.7.1
The adenosine A(2B) receptor is the least well characterized of the four known adenosine receptor subtypes because of the absence of potent, selective agonists. Here, we present five non-adenosine agonists. Among them, 2-amino-4-(4-hydroxyphenyl)-6-(1H-imidazol-2-ylmethylsulfanyl)pyridine-3,5.-dicarbonitrile, 17, LUF5834, is a high-efficacy partial agonist with EC50 = 12 nM and 45-fold selectivity over the adenosine A(3) receptor but lacking selectivity versus the A, and A(2A) subtypes. Compound 18, LUF5835, the 3-hydroxyphenyl analogue, is a full agonist with EC50 = 10 nM.
A Series of Ligands Displaying a Remarkable Agonistic−Antagonistic Profile at the Adenosine A<sub>1</sub> Receptor
作者:Lisa C. W. Chang、Jacobien K. von Frijtag Drabbe Künzel、Thea Mulder-Krieger、Ronald F. Spanjersberg、Sophie F. Roerink、Gijs van den Hout、Margot W. Beukers、Johannes Brussee、Adriaan P. IJzerman
DOI:10.1021/jm049597+
日期:2005.3.1
Adenosine receptor agonists are usually variations of the natural ligand, adenosine. The ribose moiety in the ligand has previously been shown to be of great importance for the agonistic effects of the compound. In this paper, we present a series of nonadenosine ligands selective for the adenosine A(1) receptor with an extraordinary pharmacological profile. 2-Amino-4-benzo[1,3]dioxol-5-yl-6-(2-hydroxyethylsulfanyl)pyridine-3,5-dicarbonitrile (70, LUF 5853) shows full agonistic behavior comparable with the reference compound CPA, while also displaying comparable receptor binding affinity (K-i = 11 nM). In contrast, compound 58 (2-amino-4-(3-trifluoromethylphenyl)-6-(2-hydroxyethylsulfanyl)pyridine-3,5-dicarbonitrile, LUF 5948) has a binding affinity of 14 nM and acts as an inverse agonist. Also present within this same series are compounds that show neutral antagonism of the adenosine A(1) receptor, for example compound 65 (2-amino-4-(4-difluoromethoxyphenyl)-6-(2-hydroxyethylsulfanyl)pyridine-3,5-dicarbonitrile, LUF 5826).