Synthetic single and double aza-scorpiand macrocycles acting as inhibitors of the antioxidant enzymes iron superoxide dismutase and trypanothione reductase in Trypanosoma cruzi with promising results in a murine model
作者:F. Olmo、M. P. Clares、C. Marín、J. González、M. Inclán、C. Soriano、K. Urbanová、R. Tejero、M. J. Rosales、R. L. Krauth-Siegel、M. Sánchez-Moreno、E. García-España
DOI:10.1039/c4ra09866h
日期:——
Synthetic scorpiand-like azamacrocycles selectively inhibit SOD and TR enzymes of Trypanosoma cruzi in mice causing death of the parasites and increasing the mouse survival rate after infection and treatment.
Tritopic phenanthroline and pyridine tail-tied aza-scorpiands
作者:Jorge González、José M. Llinares、Raquel Belda、Javier Pitarch、Concepción Soriano、Roberto Tejero、Begoña Verdejo、Enrique García-España
DOI:10.1039/b927418a
日期:——
calculations, NMR, UV-Vis and steady-state fluorescence techniques. L1 and L2 behave, respectively, as hexaprotic and heptaprotic bases in the experimental conditions used (298.1 ± 0.1 K, 0.15 mol dm−3 NaCl, pH range under study 2.0–11.0). These ligands are able to form mono-, bi- and trinuclear Zn2+ complexes depending on the Zn2+-receptor molar ratio. Interaction of L1 and L2 with pyrophosphate (PPi), tripolyphosphate
Equilibrium and kinetic studies on complex formation and decomposition and the movement of Cu2+metal ions within polytopic receptors
作者:Carmen Ester Castillo、Jorge González-García、José M. Llinares、M. Angeles Máñez、Hermas R. Jimenez、Enrique García-España、Manuel G. Basallote
DOI:10.1039/c3dt32220c
日期:——
various complexes formed. Kineticstudies on complex formation and decomposition have also been carried out. Complex formation occurs with polyphasic kinetics for both receptors, although a significant difference is found between both ligands with respect to the relative values of the rate constants for the metal coordination steps and the structural reorganizations following them. Complex decomposition
对两个三位双蝎子受体的相互作用进行了电位测量研究,其中两个等效的5-(2-氨基乙基)-2,5,8-三氮杂[9]-(2,6)-吡啶并菲部分与2, 9-二甲基菲咯啉(L1)和2,6-二甲基吡啶(L2)建立了单核,双核和三核Cu 2+络合物的形成。稳定常数和顺磁性的值11 H NMR研究使人们可以推断出形成的各种络合物的最可能的配位方式。还对复合物的形成和分解进行了动力学研究。尽管两个配体之间在金属配位步骤和其后的结构重组的速率常数的相对值方面发现了显着差异,但两个受体的复合物形成均具有多相动力学。复杂的分解过程通过两个独立的动力学步骤发生,第一个步骤是如此之快,以至于它在停止流动的混合时间内发生,而第二个步骤则很慢,足以使用常规分光光度计进行动力学研究。总体而言,动力学实验还提供了有关金属离子在受体内运动的信息。
Identification of Aryl Polyamines Derivatives as Anti-Trypanosoma cruzi Agents Targeting Iron Superoxide Dismutase
作者:Rubén Martín-Escolano、Daniel Molina-Carreño、Javier Martín-Escolano、Mª Paz Clares、Cristina Galiana-Roselló、Jorge González-García、Nuria Cirauqui、José M. Llinares、María José Rosales、Enrique García-España、Clotilde Marín
DOI:10.3390/pharmaceutics15010140
日期:——
widespread as a result of globalization. Currently, 6-8 million people are infected worldwide, and no effective treatment is available. Here, we identify new effective agents against T. cruzi. In short, 16 aryl polyamines were screened in vitro against different T. cruzi strains, and lead compounds were evaluated in vivo after oral administration in both the acute and chronic infections. The mode of action
南美锥虫病 (CD) 是由克氏锥虫引起的一种可能致命的热带感染。尽管 CD 作为一种无声疾病仅限于拉丁美洲,但随着全球化的发展,CD 已变得普遍。目前,全世界有6-8百万人被感染,并且没有有效的治疗方法。在这里,我们确定了针对 T. cruzi 的新有效药物。简而言之,针对不同的 T. cruzi 菌株体外筛选了 16 种芳基多胺,并在急性和慢性感染中口服给药后对先导化合物进行了体内评估。还在能量水平上评估了作用方式,其高活性特征可归因于线粒体依赖性生物能量崩溃和通过抑制 Fe-SOD 酶而产生的氧化还原应激。
Oxidative stress protection by manganese complexes of tail-tied aza-scorpiand ligands
The Mn2+ coordination chemistry of double scorpiand ligands in which two polyazacyclophane macrocycles have been connected by pyridine, phenanthroline and bipyridine spacers has been studied by potentiometry, paramagnetic NMR and electrochemistry. All ligands show high stability with Mn2+ and the complexes were formed in a wide pH range. DFT calculations support the structures and coordination geometries derived from the study. A remarkable antioxidant activity was evidenced for these systems by the McCord-Fridovich assay and in Escherichia coli sodAsodB deficient bacterial cells. The three systems were tested as anti-inflammatory drugs in human macrophages measuring the accumulation of cytokines upon lipopolysaccharide (LPS) pro inflammatory effect. All complexes showed anti-inflammatory effect, being [Mn(2)L1](4+) the most efficient one. (C) 2016 Elsevier Inc. All rights reserved.