Identification of 5-(1-Methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl)thiophene-2-Carboxamides as Novel and Selective Monoamine Oxidase B Inhibitors Used to Improve Memory and Cognition,ACS Chemical Neuroscience

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Identification of 5-(1-Methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl)thiophene-2-Carboxamides as Novel and Selective Monoamine Oxidase B Inhibitors Used to Improve Memory and Cognition
ACS Chemical Neuroscience ( IF 4.1 ) Pub Date : 2017-09-20 00:00:00 , DOI: 10.1021/acschemneuro.7b00282
Alan P. Kaplan ₁ , Terence Keenan ₁ , Roderick Scott ₁ , Xianbo Zhou ₂ , Rusiko Bourchouladze ₁ , Andrew J. McRiner ₃ , Mark E. Wilson ₁ , Darlene Romashko ₄ , Regina Miller ₅ , Matthew Bletsch ₆ , Gary Anderson ₁ , Jennifer Stanley ₁ , Adia Zhang ₁ , Dong Lee ₁ , John Nikpur ₁

Affiliation

Initial work in Drosophila and mice demonstrated that the transcription factor cyclic adenosine monophosphate (cAMP) response element binding protein (CREB) is a master control gene for memory formation. The relationship between CREB and memory has also been found to be true in other species, including aplysia and rats. It is thus well-established that CREB activation plays a central role in memory enhancement and that CREB is activated during memory formation. On the basis of these findings, a phenotypic high-throughput screening campaign utilizing a CRE-luciferase (CRE-Luci) SK-N-MC cell line was performed to identify compounds that enhance transcriptional activation of the CRE promoter with a suboptimal dose of forskolin. A number of small-molecule hits of unknown mechanisms of action were identified in the screening campaign, including HT-0411. Follow-up studies suggested that the CREB activation by HT-0411 is attributed to its specific and selective inhibition of monoamine oxidase B (MAO-B). Further, HT-0411 was shown to improve 24 h memory in rodents in a contextual fear conditioning model. This report describes the lead optimization of a series of 5-(1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl) thiophene-2-carboxamides that were identified as novel, potent, and selective inhibitors of MAO-B. Extensive SAR studies and in vivo behavioral evaluations of this and other related analogue series identified a number of potential clinical development candidates; ultimately, compound 8f was identified as a candidate molecule with high selectivity toward MAO-B (29–56 nM) over MAO-A (19% inhibition at a screening concentration of 50 μM), an excellent profile against a panel of other enzymes and receptors, good pharmacokinetic properties in rodents and dogs, and efficacy in multiple rodent memory models.

中文翻译：

5-（1-甲基-5-（三氟甲基）-1 H-吡唑-3-基）噻吩-2-羧酰胺的鉴定为新型和选择性单胺氧化酶B抑制剂，可用于改善记忆力和认知能力

果蝇的初步工作小鼠证明，转录因子环状单磷酸腺苷（cAMP）响应元件结合蛋白（CREB）是记忆形成的主要控制基因。还发现CREB与记忆之间的关系在其他物种中也是如此，包括海狸鼠和大鼠。因此，众所周知的是，CREB激活在记忆增强中起着中心作用，并且CREB在记忆形成过程中被激活。基于这些发现，进行了利用CRE-萤光素酶（CRE-Luci）SK-N-MC细胞系的表型高通量筛选活动，以鉴定可通过次适量的福司高林增强CRE启动子转录激活的化合物。。在筛选活动中发现了许多未知作用机制的小分子命中物，包括HT-0411。后续研究表明，HT-0411对CREB的激活归因于其对单胺氧化酶B（MAO-B）的特异性和选择性抑制。此外，在上下文恐惧条件模型中，HT-0411被证明可以改善啮齿动物的24 h记忆能力。本报告介绍了一系列5-（1-甲基-5-（三氟甲基）-1H-吡唑-3-基）噻吩-2-甲酰胺被确定为MAO-B的新型，有效和选择性抑制剂。广泛的SAR研究以及对该系列和其他相关类似系列的体内行为评估确定了许多潜在的临床开发候选药物。最终，化合物8f被确定为对MAO-B（29–56 nM）的选择性强于MAO-A的候选分子（在筛选浓度为50μM时抑制率达19％），对一组其他酶和受体，在啮齿动物和狗中良好的药代动力学特性，以及在多种啮齿动物记忆模型中的功效。

更新日期：2017-09-20

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