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Improved Therapeutic Efficiency of Senescent Cell-specific, Galactose-Functionalized Micelle Nanocarriers
Badri Parshad1, Andrew George Baker1,2, Ishtiaq Ahmed1
1Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge, CB3 0AS, UK.
Abstract:
Cellular senescence has recently been recognized as one of the hallmarks of cancer, aging, as well as many age-related disorders, sparking significant interest in the development of senolytics, compounds that can remove senescent cells. However, most current pharmacological strategies face challenges related to non-specific delivery, leading to significant side effects that hinder safe and effective treatments. To address these issues, galactose-functionalized amphiphiles are synthesized that can self-assemble into micelles and be loaded with a senolytic cargo. These galactose-micelles are responsive to the lysosomal β-galactosidase enzyme, present in elevated amounts in senescent cells, and are employed for specific delivery of the senolytic Bcl2-inhibitor Navitoclax. This novel formulation showed reduced delivery and toxicity to non-senescent cells, thereby increasing the senolytic index of Navitoclax and making it suitable for future in vivo experimental designs to improve selectivity and safety profiles.
Insights
Researchers developed targeted senolytics using galactose-micelles to deliver the drug Navitoclax specifically to senescent cells. This approach reduces side effects and enhances treatment safety for aging and cancer therapies.
Area of Science:
- Biomedical Engineering
- Gerontology
- Pharmacology
Background:
- Cellular senescence is a key factor in aging, cancer, and age-related diseases.
- Current senolytic drugs often lack specific delivery, causing side effects.
- Targeted delivery systems are needed to improve senolytic therapy safety and efficacy.
Purpose of the Study:
- To develop a targeted drug delivery system for senolytics.
- To enhance the selectivity and safety of Navitoclax using a novel formulation.
- To leverage galactose-micelles for senescent cell-specific drug delivery.
Main Methods:
- Synthesis of galactose-functionalized amphiphiles for micelle self-assembly.
- Loading of the senolytic drug Navitoclax into galactose-micelles.
- Evaluation of micelle responsiveness to lysosomal β-galactosidase in senescent cells.
- Assessment of drug delivery, toxicity, and senolytic index in vitro.
Main Results:
- Galactose-micelles demonstrated targeted delivery of Navitoclax to senescent cells.
- The formulation showed reduced toxicity to non-senescent cells.
- The senolytic index of Navitoclax was significantly increased.
- The novel delivery system improved selectivity and safety profiles.
Conclusions:
- Galactose-micelles offer a promising strategy for targeted senolytic drug delivery.
- This approach enhances the therapeutic potential of senolytics like Navitoclax.
- The developed system paves the way for safer in vivo senolytic therapies.
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