N-Acylaminophenothiazines: Neuroprotective agents displaying multifunctional activities for a potential treatment of Alzheimer’s disease
摘要:
We have previously reported the multifunctional profile of N-(3-chloro-10H-phenothiazin-10-yl)-3-(dimethylamino)propanamide (1) as an effective neuroprotectant and selective butyrylcholinesterase inhibitor. In this paper, we have developed a series of N-acylaminophenothiazines obtained from our compound library or newly synthesised. At micro- and sub-micromolar concentrations, these compounds selectively inhibited butyrylcholinesterase (BuChE), protected neurons against damage caused by both exogenous and mitochondrial free radicals, showed low toxicity, and could penetrate into the CNS. In addition, N-(3-chloro-10H-phenothiazin-10-yl)-2-(pyrrolidin-1-yl)acetamide (11) modulated the cytosolic calcium concentration and protected human neuroblastoma cells against several toxics, such as calcium overload induced by an L-type Ca2+-channel agonist, tau-hyperphosphorylation induced by okadaic acid and A beta peptide. (C) 2011 Elsevier Masson SAS. All rights reserved.
N-Acylaminophenothiazines: Neuroprotective agents displaying multifunctional activities for a potential treatment of Alzheimer’s disease
摘要:
We have previously reported the multifunctional profile of N-(3-chloro-10H-phenothiazin-10-yl)-3-(dimethylamino)propanamide (1) as an effective neuroprotectant and selective butyrylcholinesterase inhibitor. In this paper, we have developed a series of N-acylaminophenothiazines obtained from our compound library or newly synthesised. At micro- and sub-micromolar concentrations, these compounds selectively inhibited butyrylcholinesterase (BuChE), protected neurons against damage caused by both exogenous and mitochondrial free radicals, showed low toxicity, and could penetrate into the CNS. In addition, N-(3-chloro-10H-phenothiazin-10-yl)-2-(pyrrolidin-1-yl)acetamide (11) modulated the cytosolic calcium concentration and protected human neuroblastoma cells against several toxics, such as calcium overload induced by an L-type Ca2+-channel agonist, tau-hyperphosphorylation induced by okadaic acid and A beta peptide. (C) 2011 Elsevier Masson SAS. All rights reserved.
Chalcogen-bridged seven-membered cyclic azobenzenes, dibenzo[b,f][1,4,5]chalcogenadiazepine (DBChD), exhibit distinct photo-switching characters with a high-energy E-configuration, especially for sulfur-bridged DBTD with an energy transduction efficiency of 21 % (η) under 445 nm laser activation. Introducing oligothiophene π-EDG on DBTD could further elevate the absorption λmax and coefficient ϵ, reaching
硫属元素桥接的七元环状偶氮苯二苯并[ b , f ][1,4,5]硫属二氮杂卓 (DBChD) 具有高能 E 构型的独特光开关特性,特别是对于具有高能 E 构型的硫桥接 DBTD在 445 nm 激光激活下,能量转换效率为 21% (η)。在 DBTD 上引入低聚噻吩 π-EDG 可以进一步提高吸收 λ max和系数 ϵ,达到 η=29 %。
Dibenzo[1,4,5]thiadiazepine: A hardly-known heterocyclic system with neuroprotective properties of potential usefulness in the treatment of neurodegenerative diseases
作者:Gema C. González-Muñoz、Mariana P. Arce、Concepción Pérez、Alejandro Romero、Mercedes Villarroya、Manuela G. López、Santiago Conde、María Isabel Rodríguez-Franco
DOI:10.1016/j.ejmech.2014.04.075
日期:2014.6
In this work we describe a new family of dibenzo[1,4,5]thiadiazepines (2-12) that showed an interesting in vitro biological profile, namely neuroprotective and antioxidant properties, as well as blockade of cytosolic calcium entry. They showed no cytotoxic effects and the majority were predicted as CNS-permeable compounds. In human neuroblastoma cells they displayed good neuroprotective properties against mitochondrial oxidative stress which, in many cases, almost reached the full protection (>90%) when compounds were incubated with cells 24 h before the addition of toxic stressors. In co-incubation conditions these figures were smaller, although some compounds maintained an interesting level of neuroprotection, higher than 50%. Four selected compounds (2, 5, 8, and 11) were found to be effective antioxidant agents by sequestering mitochondrial radical oxygen species (ROS). Moreover, compound 2 showed a remarkable calcium-channel modulating activity. The interest of these compounds is increased by the fact that dibenzo[1,4,5]thiadiazepine is a barely known structure that is not difficult to synthesize and presents very few described derivatives, opening a new and broad line of research in Medicinal Chemistry. (C) 2014 Elsevier Masson SAS. All rights reserved.