Ability of Azathiacyclen Ligands to Stop Cu(Aβ)‐Induced Production of Reactive Oxygen Species: [3N1S] is the Right Donor Set

Kyangwi Malikidogo (1) , Marielle Drommi (1) , Elena Atrián-Blasco (1) , Jan Hormann (2) , Nora Kulak (2, 3) , Charlène Esmieu (1) , Christelle Hureau (1)

1 LCC - Laboratoire de chimie de coordination
2 Freie Universität Berlin
3 OVGU - Otto-von-Guericke-Universität Magdeburg = Otto-von-Guericke University [Magdeburg]

Alzheimer’s disease (AD) is an incurable neurodegenerative disease that leads to the progressive and irreversible loss of mental functions. The amyloid beta (Aβ) peptide involved in the disease is responsible for the production of damaging reactive oxygen species (ROS) when bound to Cu ions. A therapeutic approach, which consists in removing Cu ions from Aβ to alter this deleterious interaction, is currently developed. In this context, we report the ability of 5 different 12-membered thiaazacyclen ligands to capture Cu from Aβ and to redox silence it. We propose that the presence of a sole sulfur atom in the ligand increases the rate of Cu capture and removal from Aβ, while the kinetic aspect of the chelation was an issue encountered with the 4N parent ligand. The best ligand in removing Cu from Aβ and inhibiting the associated ROS production is the 1-thia-4,7,10-triazacyclododecane [3N1S]. Indeed the replacement of more N by S atoms makes the corresponding Cu complexes easier to reduce and thus able to produce ROS on their own. In addition, the ligand with three sulfur atoms has a weaker affinity for Cu(II) than Aβ, and is thus unable to remove Cu from CuAβ.

Mots clés: Alzheimer; Macrocycles; Oxidative stress; Copper; EPR

Domaines: Chimie de coordination; Chimie thérapeutique

Kyangwi Malikidogo, Marielle Drommi, Elena Atrián-Blasco, Jan Hormann, Nora Kulak, et al.. Ability of Azathiacyclen Ligands to Stop Cu(Aβ)‐Induced Production of Reactive Oxygen Species: [3N1S] is the Right Donor Set. Chemistry - A European Journal, 2023, 29 (14), pp.e202203667. ⟨10.1002/chem.202203667⟩. ⟨hal-03931017⟩