Screening Oil Components for Interleukin-2-Loaded Lipid-Based Formulations with Molecular Dynamics, In Vitro...

Area of Science:

• Biotechnology and Pharmaceutical Sciences
• Immunology
• Computational Biology

Background:

• Interleukin-2 (IL-2) is a cytokine that stimulates immune cells, crucial for cancer therapy.
• Current IL-2 therapies face challenges with toxicity due to interactions with the IL-2 receptor alpha (IL-2Rα) subunit.
• Developing IL-2 biobetters aims to improve therapeutic outcomes by modulating receptor binding.

Purpose of the Study:

• To design a lipid-based IL-2 formulation that selectively modulates IL-2Rα binding.
• To enhance the antitumor efficacy mediated by IL-2 receptor beta (IL-2Rβ) and gamma C (γc) subunits.
• To minimize immune activation associated with IL-2Rα interactions.

Main Methods:

• Utilized molecular dynamics (MD) simulations, specifically Desmond, to analyze IL-2 interactions with lipid-based formulation excipients.
• Examined temporal interactions between IL-2 and key residues (Arg38, Phe42, Leu72) at the IL-2Rα interface.
• Conducted in vitro cell culture experiments to assess the biological activity and anticancer efficacy of IL-2-loaded nanoemulsions.

Main Results:

• MD simulations indicated that selected lipids protected IL-2's polar side chains and showed no incompatibility with excipients.
• Observed specific interactions with Arg38, a residue involved in IL-2Rα binding, suggesting potential for enhanced antitumor effects.
• In vitro studies confirmed preserved IL-2 biological activity and enhanced anticancer efficacy against renal carcinoma cells.

Conclusions:

• The developed lipid-based formulation effectively stabilizes IL-2.
• The formulation enhances the antitumor mechanism by rationally modulating IL-2 interactions with its receptors.
• This approach offers a promising strategy for developing safer and more effective IL-2-based cancer immunotherapies.