Functionalized triazolopeptoids--a novel class for mitochondrial targeted delivery

Area of Science:

• Medicinal Chemistry
• Biotechnology
• Molecular Biology

Background:

• Peptidomimetics offer advantages over peptides for drug delivery.
• Developing targeted molecular transporters remains a challenge in drug delivery.

Purpose of the Study:

• Introduce linear 1,4-triazolopeptoids as novel cell-penetrating molecular transporters.
• Investigate their cellular localization and organ targeting capabilities.
• Assess their potential for delivering bioactive cargo.

Main Methods:

• Synthesis of repetitive triazole moieties using copper-catalyzed alkyne-azide cycloadditions (CuAAC) in a submonomer approach.
• Evaluation of cellular localization (endosomal, mitochondrial) in HeLa cells.
• Assessment of organ targeting in zebrafish embryos, examining localization in neuromast cells, cartilage, and blood vessels.

Main Results:

• 1,4-triazolopeptoids demonstrated cell penetration and varying cellular localization based on lipophilicity.
• Lipophilic variants showed mitochondrial colocalization in HeLa cells with moderate toxicity.
• Basic triazolopeptoids targeted neuromast cells in zebrafish, while lipophilic ones targeted cartilage and blood vessels.

Conclusions:

• Linear 1,4-triazolopeptoids represent a promising new class of cell-penetrating peptidomimetics.
• Their tunable lipophilicity allows for specific organ targeting and cellular localization.
• These transporters hold potential for the targeted delivery of bioactive cargo in various biological systems.