Through joint research with the Korea Institute of Machinery and Materials (KIMM) and the Korea Research Institute of Bioscience and Biotechnology (KRIBB), under the jurisdiction of the Ministry of Science and ICT, a 3D bioprinting technology has been developed using natural killer cells ('NK cells') as a new method of immunotherapy for treating cancer.
An NK cell is a leukocyte that responds to the formation of viruses and tumour cells and selectively kills cells that are harmful to the human body. NK cells remove distressed cells that have been infected internally, rather than viruses that have intruded from the outside.
Allowing the 3D-printed hydrogels to encapsulate NK cells helps to prevent the loss of NK cells and enables a majority of those cells to home in on the tumour cells. Pores form in the hydrogel and NK cells that retain cell viability are released after a certain amount of time, which allows for the performance of immune functions.
Image credit: Korea Institute of Machinery and Materials (KIMM)
Although NK cells are generally used for immunotherapy, the method of injecting NK cells via intravenous injection has not shown effective results in clinical trials on solid tumours (i.e. malignant tumours composed of vascular and connective tissues and which have solidity and form). This is because NK cells are incapable of retaining an appropriate level of viability and fail to target solid tumours.
However, by using the newly developed 3D bioprinting technology, NK cells can be injected into the hydrogel, printed and then cultured in a 3D environment, which enhances the cell viability and activity of NK cells and enables those cells to confront cancer tissues.
Principal researcher Su A Park, KIMM, said: "This technology can help to significantly improve the functionality of NK cells that are used for cancer treatment. We expect to contribute to the treatment of cancer patients through this newly developed technology."
This research was carried out with the support of the project for the 'Development of multiscale-vasculature-laden skin composite tissue for evaluation of implantable nano-bio-sensors' sponsored by the Ministry of Science and ICT and the National Research Foundation of Korea, and the project for the 'development of UnTACT systems for critical illnesses' conducted by the Convergence Research Center of the National Research Council of Science and Technology.
The resulting research paper – 'NK cells encapsulated in micro/macropore-forming hydrogels via 3D bioprinting for tumor immunotherapy' – has been published in the journal Biomaterials Research.
