Injectable Nano-Network Controls Blood Sugar in Diabetics for Days at a Time
In a promising development for diabetes treatment, researchers have developed a network of nanoscale particles that can be injected into the body and release insulin when blood-sugar levels rise, maintaining normal blood sugar levels for more than a week in animal-based laboratory tests. The work was done by researchers at North Carolina State University, the University of North Carolina at Chapel Hill, the Massachusetts Institute of Technology and Children's Hospital Boston.
"We've created a 'smart' system that is injected into the body and responds to changes in blood sugar by releasing insulin, effectively controlling blood-sugar levels," says Dr. Zhen Gu, lead author of a paper describing the work and an assistant professor in the joint biomedical engineering program at NC State and UNC Chapel Hill. "We've tested the technology in mice, and one injection was able to maintain blood sugar levels in the normal range for up to 10 days."
The nano-network releases insulin in response to changes in blood sugar. (Click to enlarge image.)
When a patient has type 1 diabetes, his or her body does not produce sufficient insulin, a hormone that transports glucose – or blood sugar – from the bloodstream into the body's cells. This can cause a host of health effects. Currently, diabetes patients must take frequent blood samples to monitor their blood-sugar levels and inject insulin as needed to ensure their blood sugar levels are in the "normal" range. However, these injections can be painful, and it can be difficult to determine the accurate dose level of insulin. Administering too much or too little insulin poses its own health risks.
The new, injectable nano-network is composed of a mixture containing nanoparticles with a solid core of insulin, modified dextran and glucose oxidase enzymes. When the enzymes are exposed to high glucose levels they effectively convert glucose into gluconic acid, which breaks down the modified dextran and releases the insulin. The insulin then brings the glucose levels under control. The gluconic acid and dextran are fully biocompatible and dissolve in the body.
Each of these nanoparticle cores is given either a positively charged or negatively charged biocompatible coating. The positively charged coatings are made of chitosan (a material normally found in shrimp shells), while the negatively charged coatings are made of alginate (a material normally found in seaweed).
When the solution of coated nanoparticles is mixed together, the positively and negatively charged coatings are attracted to each other to form a "nano-network." Once injected into the subcutaneous layer of the skin, the nano-network holds the nanoparticles together and prevents them from dispersing throughout the body. Both the nano-network and the coatings are porous, allowing blood – and blood sugar – to reach the nanoparticle cores.
"This technology effectively creates a 'closed-loop' system that mimics the activity of the pancreas in a healthy person, releasing insulin in response to glucose level changes," Gu says. "This has the potential to improve the health and quality of life of diabetes patients."
Gu's research team is currently in discussions to move the technology into clinical trials for use in humans.
The paper, "Injectable Nano-Network for Glucose-Mediated Insulin Delivery," was published online May 2 in ACS Nano. The paper was co-authored by a team led by Dr. Robert Langer, MIT's David H. Koch Institute Professor, and Dr. Daniel Anderson, the Samuel A. Goldblith Associate Professor of Chemical Engineering and a member of MIT's Institute for Medical Engineering and Science, David H. Koch Institute for Integrative Cancer Research and Children's Hospital Boston. The research was supported by a grant from the Leona M. and Harry B. Helmsley Charitable Trust Foundation, and a generous gift from the Tayebati Family Foundation.
Note to Editors: The study abstract follows.
"Injectable Nano-Network for Glucose-Mediated Insulin Delivery"
Authors: Zhen Gu, North Carolina State University and the University of North Carolina at Chapel Hill; Alex Aimetti, Yunlong Zhang, Omid Veiseh, Robert Langer and Daniel G. Anderson, MIT and Children's Hospital Boston; Qun Wang, Tram T. Dang and Hao Cheng, MIT
Published: May 2, ACS Nano
Abstract: Diabetes mellitus, a disorder of glucose regulation, is a global burden affecting 366 million people across the world. An artificial "closed-loop" system able to mimic pancreas activity and release insulin in response to glucose level changes has the potential to improve patient compliance and health. Herein we develop a glucose-mediated release strategy for the self-regulated delivery of insulin using injectable and acid-degradable polymeric network. Formed by electrostatic interaction between oppositely charged dextran nanoparticles loaded with insulin and glucose-specific enzymes, the nanocomposite-based porous architecture can be dissociated and subsequently release insulin in a hyperglycemic state through the catalytic conversion of glucose into gluconic acid. In vitro insulin release can be modulated in a pulsatile profile in response to glucose concentrations. In vivo studies validated that these formulations provided for improved glucose control in Type 1 diabetic mice subcutaneously administered with a degradable nano-network. A single injection of the developed nano-network facilitated stabilization of the blood glucose levels in the normoglycemic state (< 200 mg/dL) for up to at least 10 days.