Potent antioxidant dendrimers lacking pro-oxidant activity

Area of Science:

• Biochemistry
• Materials Science
• Nanotechnology

Background:

• Antioxidants combat oxidative stress but can exhibit pro-oxidant effects with transition metals, potentially damaging DNA.
• Developing antioxidants with potent free radical-scavenging abilities and minimal pro-oxidant activity is crucial for biological applications.

Purpose of the Study:

• To synthesize and characterize novel antioxidant dendrimers with minimized pro-oxidant activity.
• To evaluate the free radical-scavenging efficacy and protective effects of these dendrimers against oxidative damage.
• To assess the DNA-damaging potential of the dendrimers in the presence of copper ions.

Main Methods:

• Synthesis of dendrimers by attaching syringaldehyde or vanillin to a tris(2-aminoethyl)amine (TREN) core via reductive amination.
• Evaluation of free radical-scavenging activity using the 1,1-diphenyl-2-picrylhydrazyl (DPPH) assay.
• Assessment of protective effects against oxidative damage to low-density lipoprotein, lysozyme, and DNA.
• Testing for DNA damage and cytotoxicity in the presence of copper ions and Chinese hamster ovary cells, respectively.

Main Results:

• The synthesized TREN-core dendrimers demonstrated potent free radical-scavenging properties, exceeding those of quercetin and Trolox.
• Dendrimers effectively protected biological molecules (LDL, lysozyme, DNA) from free radical-induced damage.
• Unlike quercetin and Trolox, the dendrimers did not induce DNA damage in the presence of copper ions and exhibited no cytotoxicity.

Conclusions:

• The developed TREN-core antioxidant dendrimers possess strong antioxidant and protective capabilities.
• These dendrimers offer a significant advantage by lacking pro-oxidant activity, thus preventing DNA damage in biological systems.
• The findings highlight the potential of these novel dendrimers for applications where antioxidant protection is required without adverse pro-oxidant side effects.