Glucose-responsive insulin delivery systems that mimic pancreatic endocrine function could enhance health and improve quality of life for people with type 1 and type 2 diabetes with reduced β-cell function. However, insulin delivery systems with rapid in vivo glucose-responsive behaviour typically have limited insulin-loading capacities and cannot be manufactured easily. Here, we show that a single removable transdermal patch, bearing microneedles loaded with insulin and a non-degradable glucose-responsive polymeric matrix, and fabricated via in situ photopolymerization, regulated blood glucose in insulin-deficient diabetic mice and minipigs (for minipigs >25 kg, glucose regulation lasted >20 h with patches of ~5 cm2). Under hyperglycaemic conditions, phenylboronic acid units within the polymeric matrix reversibly form glucose–boronate complexes that—owing to their increased negative charge—induce the swelling of the polymeric matrix and weaken the electrostatic interactions between the negatively charged insulin and polymers, promoting the rapid release of insulin. This proof-of-concept demonstration may aid the development of other translational stimuli-responsive microneedle patches for drug delivery.
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The authors declare that all of the data supporting the findings of this study are available within the paper and the Supplementary Information.
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This work was supported by grants from Zenomics Inc. and a start-up package from University of California, Los Angeles. We acknowledge the use of the Analytical Instrumentation Facility at North Carolina State, which is supported by the State of North Carolina and National Science Foundation. A.R.K. is supported by the National Institute of Diabetes and Digestive and Kidney Diseases of the National Institutes of Health (grant no. F30DK113728). The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.
Z.G., J.Y. and G.C. have applied for patents related to this study. Z.G. is a scientific co-founder of Zenomics Inc. R.L. and J.B.B. are Scientific Advisory Board members of Zenomics Inc. J.Y., Y.Z., W.M. and Y.Y. are full-time employees of Zenomics Inc. R.L. discloses potential competing interests due to his affiliation with Zenomics Inc. For a list of entities with which R.L. is involved, compensated or uncompensated, see https://tinyurl.com/RLCOINBME. The remaining authors declare no competing interests.
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Yu, J., Wang, J., Zhang, Y. et al. Glucose-responsive insulin patch for the regulation of blood glucose in mice and minipigs. Nat Biomed Eng (2020). https://doi.org/10.1038/s41551-019-0508-y