A systemic route for drug loading to lymphatic phagocytes

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Pharmacology

Background:

• Lymph nodes are crucial sites for pathogen proliferation and cancer metastasis.
• Effective drug delivery to lymph nodes is essential for treating infections and cancers.
• Current systemic drug delivery often fails to achieve therapeutic concentrations in lymph node tissues.

Purpose of the Study:

• To develop a lymph node-specific nanocarrier for targeted drug delivery.
• To investigate the systemic administration and biodistribution of this nanocarrier.
• To assess the potential for loading lymph node phagocytes with therapeutic agents.

Main Methods:

• Assembly of a 10-15 nm nanocarrier with a drug-carrying core and a poly(1-->6)-alpha-d-glucose based interface.
• In vivo investigation of nanocarrier biokinetics and microdistribution in animal models.
• Analysis of nanocarrier accumulation and cellular localization within lymph nodes.

Main Results:

• The nanocarrier demonstrated significant accumulation in central lymph nodes, reaching 30-35% dose/g.
• Nanocarriers were effectively deposited in various phagocytic cell populations within the lymph nodes.
• Phagocytic cells harboring translocated microparticles also showed nanocarrier uptake.

Conclusions:

• The developed nanocarrier enables targeted systemic drug delivery to lymph node phagocytes.
• This approach facilitates drug release to phagocytic and neighboring cells within the lymph node.
• The findings support the feasibility of using this nanocarrier for enhanced lymph node-targeted therapies.