Hybrid Multifunctional Modulators Inhibit Multifaceted Aβ Toxicity and Prevent Mitochondrial Damage

Area of Science:

• Neuroscience
• Biochemistry
• Pharmacology

Background:

• Alzheimer's disease (AD) is characterized by amyloid beta (Aβ) aggregation, leading to neuronal toxicity.
• Aβ-induced toxicity involves reactive oxygen species (ROS) generation and mitochondrial dysfunction.
• Current therapeutic strategies for AD require novel approaches to address multifactorial toxicity.

Purpose of the Study:

• To develop and characterize novel hybrid multifunctional modulators (HMMs) for Alzheimer's disease (AD).
• To investigate the efficacy of HMMs in modulating amyloid beta (Aβ) aggregation and associated neurotoxicity.
• To evaluate the potential of HMMs as therapeutic agents for AD.

Main Methods:

• Synthesis and characterization of hybrid multifunctional modulators (HMMs) by integrating clioquinol (Clq) and epigallocatechin gallate (EGCG) structural features.
• Biophysical techniques and molecular docking studies to assess Aβ aggregation modulation and metal complexation.
• Cell-based assays using PC12 cells to evaluate neuroprotection against Aβ-induced toxicity, including ROS generation and mitochondrial damage assessment.

Main Results:

• The developed HMM, TGR86, demonstrated effective modulation of both metal-dependent and metal-independent Aβ aggregation.
• TGR86 successfully complexed with Cu(II), inhibiting its redox activity and preventing ROS generation.
• TGR86 exhibited antioxidant properties, protecting against DNA damage and protein oxidation, and rescued PC12 cells from Aβ-induced neurotoxicity by preventing ROS and mitochondrial damage.

Conclusions:

• TGR86 is a potent modulator of Aβ aggregation and toxicity, acting through ROS scavenging and mitochondrial protection.
• The hybrid structure of TGR86 effectively combines metal chelation and antioxidant properties for synergistic therapeutic effects.
• TGR86 represents a promising therapeutic candidate for Alzheimer's disease, addressing key pathological mechanisms of Aβ toxicity.