Interfacing biological tissues in the brain with electronic systems seems like science fiction, but developing effective strategies can aid in the treatment of neurodegenerative disorders, open opportunities for neurologically controlled prosthetics, or aid in modulating cardiovascular disease management, among other applications.
Creating devices with the ability to interface with biological systems is a unique challenge. Utilizing conductive polymers can improve biocompatibility over alternatives including metals and inorganic semiconductors. Pre-formed polymers implanted into organisms are not always well tolerated, so alternative techniques for polymer assembly in situ may offer a more effective and robust alternative.
Researchers at Purdue University, led by Jianguo Mei, PhD, are exploring how to form these conducting polymers from monomers applied directly to tissues. Their goal is to develop a system that is efficient and specifically integrated into the biological system, while limiting adverse effects, like inflammation or behavioral changes.
The team focused on a system to assemble n-doped poly(benzodifurandione) (n-PBDF) in vivo from injected monomers, using an organism’s native catalysts, specifically, the hemoproteins, which are abundant in the blood, to build the polymers.
Their research is published in a paper entitled, “Blood-catalyzed n-doped polymers for reversible optical neural control,” in Science.
“The development of n-type conducting polymers that assemble directly in vivo offers transformative, substrate-free strategy for stable electrical interfaces,” wrote the authors.
Using zebrafish and mice, the researchers tested both the safety and efficacy of injecting monomers that would polymerize into functional molecules. Zebrafish embryos injected in the yolk showed formation of the polymer, which was assessed through a color change in the yolk followed by molecular confirmation by spectroscopy analysis. The researchers found no behavioral changes or other developmental ill-effects and the embryos had an 80% survival rate one week after injection.
Mice injected with the monomers directly into the brain also showed polymerization of n-PBDF, with similar lack of negative response in physiology and behavior. They further showed that the polymer was functional within the tissues.
“The material formed stable deposits without signs of inflammation, neural cell loss, or changes in animal behavior,” the authors wrote. “Imaging and blood vessel assays supported its safety, whereas electrophysiological recordings revealed its effects: n-PBDF altered the activity of sodium and potassium channels, mechanisms critical for controlling neuronal firing.”
The researchers were also able to easily reverse the effect using two-photon near-infrared light stimulation. This allows for both localized application and controlled modification of neuronal behavior on a millisecond scale.
In a related Perspective, Maria Rosa Antognazza, PhD, and Guglielmo Lanzani, PhD, concur that this method holds promise for clinical applications. “Combining the approach with other mechanisms of neurostimulation—for example, by using magnetically responsive materials—may further broaden the clinical applicability and reduce the invasiveness.” However, they caution that more work must be done to explore other polymer structures, and test the technique in larger organisms, including humans.
This work shows the functional ability to polymerize n-PBDF in living organisms reversibly with long-term functionality, offering a promising path for alternative methods for connecting biosynthetics that are functional and robust, while reducing side effects. The authors concluded that, “This versatile, ultrasoft electrode, synthesized and actuated in situ, offers a new paradigm for minimally invasive bioelectronic interfaces.”
The post Growing Conductive Polymers Directly in the Brain appeared first on GEN – Genetic Engineering and Biotechnology News.


![Computer-aided drug design using the SILCS technology identified three sites on HIF-2 that are highly similar in HIF-1 and HIF-2 and are suitable for targeting with small molecule inhibitors. [© 2026 Salman et al. Originally published in Journal of Experimental Medicine. https://doi.org/10.1084/jem.20251009]](https://www.genengnews.com/wp-content/uploads/2026/04/Low-Res_Salman_et_al_1-280x300.jpg)
![Treatment with a dual HIF-1/2 inhibitor (bottom) greatly reduces the size of blood vessels in a tumor compared to tumor tissue from a vehicle-treated mouse (top). [© 2026 Salman et al. Originally published in Journal of Experimental Medicine. https://doi.org/10.1084/jem.20251009]](https://www.genengnews.com/wp-content/uploads/2026/04/Low-Res_Salman_et_al_2-215x300.jpg)

