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Design, Synthesis, and Evaluation of Alkoxyamine Anticancer Prodrugs Bearing Galactoside as an Enzyme-Activated
Yuliana A Kolesnikova1, Alexander A Abramov1, Daria D Eskova1
1Research School of Chemistry & Applied Biomedical Sciences, Tomsk Polytechnic University, 30 Lenin Av., Tomsk634050, Russian Federation.
Abstract:
Enzyme-induced cytotoxicity can be considered the main challenge in modern cancer therapy that provides unique opportunities for targeted apoptosis. To address this challenge, we implemented enzyme-triggered activation of alkoxyamine-galactose conjugates with the formation of active carbon-centered radical species for the apoptosis of cancer cells. The comparative analysis of two alkoxyamine derivatives, bearing stable and self-immolative linkers between the radical precursor and galactose moiety, revealed the crucial role of molecular structure in anticancer activity. The study of cytotoxicity and induced oxidative stress of free amine and two galactosides revealed the enzyme-dependent nature of the activity of alkoxyamines having a self-immolative linker against distinct cancer cell lines such as PC-3 (prostate adenocarcinoma), SKOV-3 (ovarian adenocarcinoma), MCF-7 (breast adenocarcinoma), A-431 (epidermoid carcinoma), and Jurkat cells (human T-lymphoblastic leukemia). The collected data prove the applicability of enzyme-triggered glycosylated alkoxyamines as a new family of targeted prodrugs against cancer.
Insights
Researchers developed enzyme-triggered alkoxyamine-galactose conjugates to induce cancer cell apoptosis. These targeted prodrugs show promise in cancer therapy by utilizing specific enzyme activation for controlled cell death.
Area of Science:
- Biochemistry
- Medicinal Chemistry
- Oncology
Background:
- Enzyme-induced cytotoxicity presents a significant challenge in developing effective cancer therapies.
- Targeted apoptosis offers a promising strategy for selective cancer cell elimination.
Purpose of the Study:
- To design and evaluate enzyme-triggered alkoxyamine-galactose conjugates for targeted cancer cell apoptosis.
- To investigate the role of molecular structure, specifically linker type, in the anticancer activity of these conjugates.
Main Methods:
- Synthesis of alkoxyamine-galactose conjugates with stable and self-immolative linkers.
- Comparative analysis of cytotoxicity and oxidative stress induction in various cancer cell lines (PC-3, SKOV-3, MCF-7, A-431, Jurkat).
- Enzyme-dependent activity assessment of the synthesized compounds.
Main Results:
- Alkoxyamine-galactose conjugates demonstrated enzyme-triggered activation, generating carbon-centered radicals.
- The presence and type of linker (stable vs. self-immolative) significantly influenced anticancer efficacy.
- Compounds with a self-immolative linker exhibited enzyme-dependent cytotoxicity against multiple cancer cell lines.
Conclusions:
- Glycosylated alkoxyamines activated by enzymes represent a novel class of targeted prodrugs.
- The study highlights the potential of enzyme-responsive molecular designs for selective cancer therapy.
- Structural modifications, particularly linker design, are critical for optimizing anticancer activity.
