Exosome Surface Modification for Targeted Delivery

The patent applies local quality by modifying only the surface of exosomes with specific proteins (such as antibodies, ligands, or peptides) while keeping the core exosome structure intact. This localized modification enables specific targeting capabilities without altering the fundamental properties of exosomes, allowing them to maintain their ability to cross the blood-brain barrier while gaining cell-type specificity.

The patent creates composite structures by combining exosomes with targeting molecules (forming exosome-conjugate complexes). These composite particles integrate the natural delivery capabilities of exosomes with the specific binding properties of the attached targeting molecules, achieving both blood-brain barrier penetration and cell-type specific delivery.

The patent employs preliminary action by pre-modifying exosome surfaces with targeting proteins during the exosome production process itself, rather than requiring separate conjugation steps after production. This integrated approach reduces the number of discrete manufacturing steps and simplifies the overall production workflow while achieving specific binding capabilities.

The patent utilizes self-service mechanisms where exosomes naturally express or incorporate targeting proteins through engineered cellular systems. The producing cells are designed to co-express both the exosome cargo and the targeting protein, allowing the exosomes to self-assemble with the necessary targeting components, thereby reducing external intervention and production complexity.