Background: Implantation of insulin-secreting cells has been trialed as a treatment for Type 1 diabetes mellitus; however, the host immunogenic response limits their effectiveness. Methodology: The authors developed a core-shell nanostructure of upconversion nanoparticle-mesoporous silica for controlled local delivery of an immunomodulatory agent, MCC950, using near-infrared light and validated it in in vitro models of fibrosis. Results: The individual components of the nanosystem did not affect the proliferation of insulin-secreting cells, unlike fibroblast proliferation (p < 0.01). The nanosystem is effective at releasing MCC950 and preventing fibroblast differentiation (p < 0.01), inflammation (IL-6 expression; p < 0.05) and monocyte adhesion (p < 0.01). Conclusion: This MCC950-loaded nanomedicine system could be used in the future together with insulin-secreting cell implants to increase their longevity as a curative treatment for Type 1 diabetes mellitus.
Keywords: fibroblasts; fibrosis; immune cells; immunomodulation; mesoporous silica; upconversion nanoparticles.
This work describes a new drug-delivery system that can release an immunomodulatory drug in a controlled manner and prevent fibrosis, which is part of the immune response when a foreign body is implanted. This system can be particularly useful for insulin-secreting cell implants, used to replace multiple daily injections of insulin and improve the quality of life of people with Type 1 diabetes mellitus. By preventing the immune response that leads to fibrosis, the longevity of these cellular implants can be extended without the need for frequent replacement procedures. This innovative nanosystem can release the required amount of immunomodulatory drug, which could be stimulated with the use of special light, hence showing the ability for local and extended delivery. This type of system has the potential to reduce the side effects associated with oral daily administration of immunomodulatory agents in people with Type 1 diabetes mellitus.