For six weeks, an electronic implant in diabetic mice turned surplus glucose into a harmless chemical and let the body flush it out, with no drug involved. The device comes from Martin Fussenegger’s group at ETH Zurich, which reported it in the journal Science. It has never been tried in a person.
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Fussenegger, a professor of biosystems science and engineering at ETH Zurich in Basel, framed the work as a change of strategy. For decades, he said, diabetes has been treated by telling the body how to manage glucose, and the new system takes control of glucose directly with electronics instead of drugs.
Gold, platinum and graphite felt as the catalyst
The working part is a piece of graphite felt covered in gold nanoclusters, which are in turn dotted with even smaller platinum particles. The surface was designed by the team and is entirely inorganic: no living cells, no enzymes, nothing biological that an immune system could object to. ETH Zurich’s account in its news release on the implant presents this as a way around the stability, production and regulatory problems that dogged the group’s earlier genetically engineered designs.
The catalyst oxidizes glucose to gluconate, which the body excretes in urine. Sugar handled that way is never metabolized or stored as fat, which is why the mice also lost weight, a result the authors attribute to the chemistry without having fully demonstrated the mechanism.
The design also dodges a problem familiar from earlier work. ETH Zurich’s release says the group’s previous approaches relied on engineered genetic networks, which brought questions about how well they would be tolerated by the immune system, how stable they would stay, how they could be manufactured and how regulators would treat them. A purely inorganic surface has none of those baggage items, though it brings its own: metals sitting in tissue for years, and a catalyst whose activity could fade with use.
A closed loop run from a phone or watch
Control comes from outside the animal. A conventional glucose sensor of the kind worn on the upper arm tracks tissue glucose and, when levels climb after a meal, sends a Bluetooth signal to a smartphone or smartwatch. That device wakes the implant, which draws power wirelessly at 13.56 MHz, a band set aside for industrial, scientific and medical use. A controller in a 3D-printed housing manages the electrodes.
When glucose falls back to the target range, the system shuts itself off. The shutoff is the safety feature that matters, since a device that kept burning sugar could push blood glucose dangerously low. Fussenegger also pointed to the catalyst’s selectivity: it activates only when glucose is too high.
The loop also depends on hardware outside the body behaving. The worn sensor, the Bluetooth link and the phone or watch all sit between a rising glucose reading and the implant, so a dead battery or a dropped connection would leave the device idle. The mouse experiments show the chemistry works as designed over six weeks; they say less about how such a chain holds up through months of ordinary life, travel and software updates. Wireless power supplies and external controllers are already commercially established, a fact the researchers cite when they talk about eventually plugging the implant into digital health systems and networks of connected devices.
What six weeks in mice does and does not show
On the bench, the team ran the catalyst against a reservoir holding five liters of glucose-containing nutrient solution, a volume the release compares to the blood in a human body. In diabetic mice, the implant regulated blood sugar, worked reliably for six weeks and was well tolerated. Fussenegger said the system runs at very low voltage and that the experiments showed no evidence of tissue damage.
Weight loss is the second claim worth separating from the first. Diabetic mice in the study lost weight, and the researchers attribute that to glucose being converted to gluconate rather than stored as fat. That makes the implant interesting for what the paper calls diabesity, the pairing of diabetes with obesity, but it is a likely mechanism that the release presents without detailed weight data.
Gaps remain. The coverage of the study, relayed through ScienceDaily, does not say how many mice were used or how much weight they lost, details that sit in the paper itself. Both ETH Zurich and ScienceDaily describe the work as untested in humans, and the team says more research is needed to establish safety and effectiveness in people. In the ETH Zurich release distributed on EurekAlert, Fussenegger said the catalyst switches on only when glucose runs too high and shuts off once levels return to the target.
Outside researchers were enthusiastic about the design and cautious about the evidence. Speaking to the Science Media Centre Spain, Tufts University nutrition scientist José M. Ordovás called the work an ingenious proof of concept but noted that it used small groups of genetically altered mice, leaving long-term safety and human effects unknown. Josefa García Barrado, a pharmacology professor at the University of Salamanca, said the paper does not show that other compounds formed by the electrocatalysis have been ruled out, and pointed to possible metabolic effects of byproducts.
The paper, “Wireless electrocatalytic closed-loop system for drug-free management of diabesity,” lists Debasis Maity, Parna Guha Ray, Patrick Buchmann, Gaia Charpin-El-Hamri and Fussenegger as authors, and is indexed under DOI 10.1126/science.ady8560. The group’s stated next steps are to turn the experimental implant into a medical device suited to further development and, eventually, clinical testing. Whether a platinum-and-gold surface survives years inside a human body, rather than six weeks inside a mouse, is the question that no published result yet answers.
This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.
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