Targeted drug delivery system refers to the method that selectively transports drugs to targeted tissues, organs, and cells through a variety of drugs carrier. Though tens of thousands of drug delivery systems have been developed, the effect has been minimal. This is because hundreds of proteins in the body stick to the drug delivery system (protein corona phenomenon). Because of this phenomenon, even when the drug reaches a target such as a cancer cell, the treatment efficiency is very low, and other side effects have been observed, which may cause toxic side effects.
"It was reported that it is possible to alleviate the impact of protein corona on target drug delivery through the formation of protective shield, made up of well-structured special proteins that are highly stable and do not interact with each other," says the co-senior author. "The new technology is much like the strategy where you take control of your enemies, using enemies."
In this work published in Nature Communications, the research team introduced the protein corona shield (PCS) concept for an efficient target drug delivery system. Using recombinant DNA technology, the research team has created recombinant fusion proteins with the enhanced physical stability and cancer-selective targeting ability. This fusion protein, then, was used as a shield to encapsulate the surface of nanoparticle drug carriers, thus constructing PCS nanoparticles (PCSNs).
In principle, nanoparticle drug carriers with a target ligand lose their targeting ability on being coated by blood proteins in a biological environment. However, the new PCS system can inhibit blood protein adsorption to maintain the targeting ability and avoid unwanted clearance by the mononuclear phagocyte system.
To understand the interactions between PCSNs and external biological components, the research team has created an environment similar to human biological systems. This has been analyzed via computer simulation. The results showed about 10 times greater therapeutic efficacy in preventing the invasion of unwanted external proteins.
They also examined the effect of drug delivery using immune cells and cancer cells. The PCS drug delivery system could kill cancer cells without being caught by immune cells, even after long-term exposure to biological environments. In mouse models of cancer, the team found that the PCSN exhibit lower toxicity, as well as excellent tumor-targeting ability.
"Aside from treating cancer, our findings can also be applied to a variety of fields, such as the diagnosis and treatment of various diseases, as well as the heat-optical therapy," says the senior author. "We plan to introduce a platform that will perform various roles while differently designing recombinant proteins in the future."
Protein corona shield (PCS) concept for an efficient target drug delivery system
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