Photochemical internalization: a new tool for drug delivery

Area of Science:

• Biotechnology
• Molecular Biology
• Drug Delivery

Background:

• Macromolecules are increasingly vital in treating cancer and other diseases.
• Intracellular targets are common for macromolecular therapeutics.
• Endocytic degradation is a major barrier to intracellular drug delivery.

Purpose of the Study:

• To introduce photochemical internalisation (PCI) as a novel technology for overcoming endocytic barriers.
• To demonstrate PCI's ability to release endocytosed macromolecules into the cytosol.
• To highlight PCI's potential in enhancing the efficacy of various macromolecular therapeutics.

Main Methods:

• PCI utilizes light-activated photosensitizers within endocytic vesicles.
• Activation of photosensitizers induces the release of macromolecules into the cell's cytosol.
• Targeting moieties, like epidermal growth factor, enhance PCI specificity and efficacy.

Main Results:

• PCI facilitates the intracellular delivery of diverse macromolecules, including proteins, DNA, and peptide nucleic acids.
• PCI significantly enhances the therapeutic efficacy of molecules like peptide nucleic acids (PNAs).
• PCI has shown improved efficacy with chemotherapeutic agents such as bleomycin and doxorubicin.

Conclusions:

• PCI is a light-directed technology for efficient cytosolic delivery of macromolecules.
• PCI overcomes a critical barrier in macromolecular drug delivery, improving therapeutic outcomes.
• PCI holds significant potential for applications in gene therapy, vaccination, and cancer treatment.