["PEG dilemma" for liposomes and its solving approaches]

Area of Science:

• Biomaterials Science
• Nanotechnology
• Pharmaceutical Sciences

Background:

• Polyethylene glycol (PEG)ylation is crucial for liposome stability in biological systems.
• PEGylated liposomes face challenges including reduced cellular uptake and poor endosomal escape.
• The 'PEG dilemma' impedes effective drug and gene delivery using these nanocarriers.

Purpose of the Study:

• To define and classify the
• PEG dilemma
• associated with PEGylated liposomes.
• To review and discuss strategies for overcoming the limitations imposed by the PEG dilemma.
• To highlight the importance of addressing the PEG dilemma for advanced liposomal drug delivery systems.

Main Methods:

• Literature review focusing on PEGylated liposomes and the
• PEG dilemma
• .
• Analysis of studies detailing challenges like accelerated blood clearance (ABC) and impaired cellular interactions.
• Synthesis of information on various approaches to mitigate PEG-related drawbacks.

Main Results:

• The
• PEG dilemma
• encompasses issues like low cellular uptake and insufficient endosomal escape.
• Accelerated blood clearance (ABC) phenomenon is a significant consequence of PEGylation.
• These challenges negatively impact targeted drug delivery, gene therapy, and repeated administration protocols.

Conclusions:

• The
• PEG dilemma
• presents significant obstacles for the clinical translation of PEGylated liposomes.
• Developing strategies to circumvent the
• PEG dilemma
• is critical for enhancing liposome efficacy.
• Further research is essential to optimize PEGylated liposome design for improved therapeutic outcomes.