Indole-Containing Amidinohydrazones as Nonpeptide, Dual RXFP3/4 Agonists: Synthesis, Structure–Activity Relationship, and Molecular Modeling Studies,Journal of Medicinal Chemistry

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Indole-Containing Amidinohydrazones as Nonpeptide, Dual RXFP3/4 Agonists: Synthesis, Structure–Activity Relationship, and Molecular Modeling Studies
Journal of Medicinal Chemistry ( IF 6.8 ) Pub Date : 2021-12-02 , DOI: 10.1021/acs.jmedchem.1c01081
Dongliang Guan ₁ , Md Toufiqur Rahman ₁ , Elaine A Gay ₁ , Vineetha Vasukuttan ₁ , Kelly M Mathews ₁ , Ann M Decker ₁ , Alexander H Williams ₂ , Chang-Guo Zhan ₂ , Chunyang Jin ₁

Affiliation

The central relaxin-3/RXFP3 system plays important roles in stress responses, feeding, and motivation for reward. However, exploration of its therapeutic applications has been hampered by the lack of small molecule ligands and the cross-activation of RXFP1 in the brain and RXFP4 in the periphery. Herein, we report the first structure–activity relationship studies of a series of novel nonpeptide amidinohydrazone-based agonists, which were characterized by RXFP3 functional and radioligand binding assays. Several potent and efficacious RXFP3 agonists (e.g., 10d) were identified with EC₅₀ values <10 nM. These compounds also had high potency at RXFP4 but no agonist activity at RXFP1, demonstrating > 100-fold selectivity for RXFP3/4 over RXFP1. In vitro ADME and pharmacokinetic assessments revealed that the amidinohydrazone derivatives may have limited brain permeability. Collectively, our findings provide the basis for further optimization of lead compounds to develop a suitable agonist to probe RXFP3 functions in the brain.

中文翻译：

含有吲哚的脒腙作为非肽、双 RXFP3/4 激动剂：合成、结构-活性关系和分子建模研究

中枢松弛素 3/RXFP3 系统在压力反应、喂养和奖励动机中发挥重要作用。然而，由于缺乏小分子配体以及大脑中 RXFP1 和外周 RXFP4 的交叉激活，阻碍了对其治疗应用的探索。在此，我们报告了一系列新型非肽脒腙类激动剂的首次构效关系研究，其特征在于 RXFP3 功能和放射性配体结合测定。几种强效且有效的RXFP3激动剂(例如，10d )被鉴定为EC ₅₀值<10 nM。这些化合物对 RXFP4 也具有高效力，但对 RXFP1 没有激动剂活性，表明 RXFP3/4 的选择性比 RXFP1 高 100 倍以上。体外ADME 和药代动力学评估显示脒腙衍生物可能具有有限的脑渗透性。总的来说，我们的研究结果为进一步优化先导化合物以开发合适的激动剂来探测大脑中的 RXFP3 功能提供了基础。

更新日期：2021-12-23

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