Cyclen-based chelators for the inhibition of Aβ aggregation: Synthesis, anti-oxidant and aggregation evaluation
摘要:
The aggregation of the protein amyloid-beta in the brain has been associated with neurodegenerative diseases such as Alzheimer's disease. Such aggregation of amyloid-b can be induced by misregulated metal ions such as Cu2+ and Zn2+. Here we present four metal chelating compounds based on the cyclen macrocycle that each bear a pendant arm to provide additional anti-oxidant activity. The corresponding Cu2+, Zn2+ and Ni2+ complexes have been synthesized and characterized to examine the ability of the chelators to bind to the metal centres. A beta(40) de-aggregation by the cyclen compounds was assessed using turbidometry and the re-solubilization of the A beta(40) was also examined. Our results show that the cyclen compounds have the ability to effectively chelate Cu2+ and Zn2+ metal ions and thus de-aggregate A beta(40) that has been aggregated due to the presence of these ions. The antioxidant properties of the cyclen compounds were tested by using the DPPH scavenging assay and the results show that some of the compounds can decrease oxidative stress. (C) 2017 Elsevier B.V. All rights reserved.
Cyclen-based chelators for the inhibition of Aβ aggregation: Synthesis, anti-oxidant and aggregation evaluation
摘要:
The aggregation of the protein amyloid-beta in the brain has been associated with neurodegenerative diseases such as Alzheimer's disease. Such aggregation of amyloid-b can be induced by misregulated metal ions such as Cu2+ and Zn2+. Here we present four metal chelating compounds based on the cyclen macrocycle that each bear a pendant arm to provide additional anti-oxidant activity. The corresponding Cu2+, Zn2+ and Ni2+ complexes have been synthesized and characterized to examine the ability of the chelators to bind to the metal centres. A beta(40) de-aggregation by the cyclen compounds was assessed using turbidometry and the re-solubilization of the A beta(40) was also examined. Our results show that the cyclen compounds have the ability to effectively chelate Cu2+ and Zn2+ metal ions and thus de-aggregate A beta(40) that has been aggregated due to the presence of these ions. The antioxidant properties of the cyclen compounds were tested by using the DPPH scavenging assay and the results show that some of the compounds can decrease oxidative stress. (C) 2017 Elsevier B.V. All rights reserved.
Solid phase synthesis of a 1,3,5-trisubstituted pyridinium salt library
作者:M. Amparo Lago、Thomas T. Nguyen、Pradip Bhatnagar
DOI:10.1016/s0040-4039(98)00683-2
日期:1998.6
Cyclen-based chelators for the inhibition of Aβ aggregation: Synthesis, anti-oxidant and aggregation evaluation
作者:Mahmoud El Safadi、Mohan Bhadbhade、Ronald Shimmon、Anthony T. Baker、Andrew M. McDonagh
DOI:10.1016/j.ica.2017.07.060
日期:2017.10
The aggregation of the protein amyloid-beta in the brain has been associated with neurodegenerative diseases such as Alzheimer's disease. Such aggregation of amyloid-b can be induced by misregulated metal ions such as Cu2+ and Zn2+. Here we present four metal chelating compounds based on the cyclen macrocycle that each bear a pendant arm to provide additional anti-oxidant activity. The corresponding Cu2+, Zn2+ and Ni2+ complexes have been synthesized and characterized to examine the ability of the chelators to bind to the metal centres. A beta(40) de-aggregation by the cyclen compounds was assessed using turbidometry and the re-solubilization of the A beta(40) was also examined. Our results show that the cyclen compounds have the ability to effectively chelate Cu2+ and Zn2+ metal ions and thus de-aggregate A beta(40) that has been aggregated due to the presence of these ions. The antioxidant properties of the cyclen compounds were tested by using the DPPH scavenging assay and the results show that some of the compounds can decrease oxidative stress. (C) 2017 Elsevier B.V. All rights reserved.