In vitro activity of scorpiand-like azamacrocycle derivatives in promastigotes and intracellular amastigotes of Leishmania infantum and Leishmania braziliensis
摘要:
The activity of a family scorpiand-like azamacrocycles against Leishmania infantum and Leishmania braziliensis was studied using promastigotes, axenic and intracellular amastigotes forms. All the compounds are more active and less toxic than meglumine antimoniate (Glucantime). Moreover, the data on infection rates and amastigotes showed that compounds P2Py, PN and P3Py are the most active against both species of Leishmania. On the other hand, studies on the inhibitory effect of these compounds on SOD enzymes showed that while the inhibition of the Fe-SOD enzyme of the promastigote forms of the parasites is remarkable, the inhibition of human CuZn-SOD and Mn-SOD from Escherichia coli is negligible. The ultrastructural alterations observed in treated promastigote forms confirmed that the compounds having the highest activity were those causing the largest cell damage. The modifications observed by H-1 NMR, and the amounts of catabolites excreted by the parasites after treatment with the compounds, suggested that the catabolic mechanism could depend on the structure of the side chains linked to the aza-scorpiand macrocycles. (C) 2013 Elsevier Masson SAS. All rights reserved.
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.
MnII complexes of scorpiand-type azamacrocycles constituted by a tretrazapyridinophane core appended with an ethylamino tail including 2- or 4-quinoline functionalities show very appealing in vitro SOD activity. The observed behaviour is related to structural and electrochemical parameters.
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
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。
Modulation of DNA Binding by Reversible Metal-Controlled Molecular Reorganizations of Scorpiand-like Ligands
DNA interaction with scorpiand azamacrocycles has been achieved through modulation of their binding affinities. Studies performed with different experimental techniques provided evidence that pH or metal-driven molecular reorganizations of these ligands regulate their ability to interact with calf thymus DNA (ctDNA) through an intercalative mode. Interestingly enough, metal-driven molecular reorganizations serve to increase or decrease the biological activities of these compounds significantly.