Innovative lipoplexes formulations with enhanced siRNA efficacy for cancer treatment: Where are we now?

Area of Science:

• Biotechnology
• Molecular Biology
• Cancer Therapy

Background:

• RNA interference (siRNA) is a gene silencing mechanism with therapeutic potential for diseases like cancer.
• siRNA offers an alternative to chemotherapy with potentially fewer side effects.
• Naked siRNA exhibits poor stability in vivo, necessitating delivery vectors like liposomes or Lipid Nanoparticles (LNPs).

Purpose of the Study:

• To review recent innovations in lipoplex formulations for enhanced siRNA delivery and efficacy in cancer therapy.
• To explore the use of pH-sensitive lipids, peptides, and cell-penetrating peptides/polymers in lipoplexes.
• To address the challenges in clinical translation of siRNA-based therapies, particularly for cancer.

Main Methods:

• Review of recent literature on advanced lipoplex formulations for siRNA delivery.
• Focus on components that enhance fusogenic properties, endosomal escape, cellular uptake, and tumor targeting.
• Analysis of strategies to improve siRNA stability in the bloodstream.

Main Results:

• Incorporation of pH-sensitive lipids, peptides, and cell-penetrating peptides/polymers enhances lipoplex performance.
• These innovations improve endosomal escape, cellular uptake, and tumor targeting.
• Enhanced stability and tumor accumulation of siRNA are crucial for effective antitumor effects.

Conclusions:

• Innovative lipoplex formulations are critical for overcoming limitations in siRNA cancer therapy.
• pH-sensitive lipids and peptides improve siRNA delivery by enhancing cellular processes and stability.
• Further development of these advanced lipoplexes is essential for efficient siRNA accumulation and antitumor activity in complex tumor microenvironments.