Multistage pH-responsive liposomes for mitochondrial-targeted anticancer drug delivery

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Drug Delivery Systems

Background:

• Anticancer drugs face significant barriers in reaching tumor targets after injection.
• Existing drug delivery systems struggle with efficient transport across physiological and biological barriers.
• Targeted delivery to tumor cells, specifically mitochondria, remains a challenge.

Purpose of the Study:

• To develop zwitterionic oligopeptide liposomes (HHG2C(18)-L) for improved anticancer drug delivery.
• To engineer a smart lipid (1,5-dioctadecyl-L-glutamyl 2-histidyl-hexahydrobenzoic acid, HHG2C(18)) with multistage pH-responsive properties.
• To enhance tumor cell entry, endolysosomal escape, and mitochondrial accumulation of drugs.

Main Methods:

• Synthesis of zwitterionic oligopeptide liposomes (HHG2C(18)-L) incorporating a smart lipid (HHG2C(18)).
• Evaluation of the pH-responsive characteristics of the liposomes.
• Assessment of liposome behavior within tumor cells, focusing on endolysosomal escape and mitochondrial targeting.

Main Results:

• HHG2C(18)-L demonstrated multistage pH-responsiveness tailored to tumor cell microenvironments.
• The liposomes facilitated more effective entry into tumor cells.
• Improved escape from endolysosomes and enhanced accumulation within mitochondria were observed.

Conclusions:

• Zwitterionic oligopeptide liposomes (HHG2C(18)-L) represent a promising platform for overcoming drug delivery barriers.
• The multistage pH-responsive nature of HHG2C(18)-L is key to their enhanced cellular uptake and mitochondrial targeting.
• This novel liposomal system holds potential for improving the efficacy of anticancer therapies.