Artistic depiction of the human brain. Image credits: ZME Science.
The human brain is probably the most complex structure we know of. Yet we still use open-brain surgery, implanted whips, and wires threated through delicate tissue for many interventions today. But a new study points to a very different route: instead of implanting a prebuilt device, researchers used blood proteins to help build a soft neural interface directly inside living tissue. Researchers say this could be used to treat conditions like epilepsy or Parkinson’s disease.
The team showed that a molecule called benzodifurandione, or BDF, can be converted by blood proteins into a soft, conductive polymer. Once formed, this material can integrate with neural tissue and respond to near-infrared light.
That’s especially important because the brain is soft, wet, and always moving. Traditional implants are often much stiffer than the tissue around them and over time, this mismatch can trigger inflammation, scar tissue, and weaker signal quality. Even newer flexible implants can reduce some of these problems, but they still require invasive placement and can struggle with long-term stability.
“Biocompatible integration of synthetic materials with living tissue remains a major challenge for bioelectronics,” the study authors note. They suggest that their new approach promises to solve all these problems.
Built By Blood
This BDF molecule is the core of the innovation. Once injected, it starts to change its form. Blood proteins, especially hemoglobin, act as natural catalysts, triggering these molecules to link together into a conductive n-type polymer, called n-PBDF.
In effect, the bloodstream becomes a fabrication system, converting simple building blocks into a soft, electrically active network right inside the brain. Unlike earlier approaches that relied on external catalysts or special polymers, this system uses the body’s own chemistry to form the material in place.
Also, because the material forms in place, it conforms naturally to surrounding neurons. It doesn’t press against tissue like a foreign object; instead, it forms a soft conductive network within and around neural tissue. This reduces the mechanical stress that typically damages brain cells around traditional implants.
The structure can then be used for various purposes. When the researchers shone near-infrared light on the polymer, it influenced sodium ion channel activity through a thermoionic effect. That changed how neurons fired.
“Because our polymer, n-PBDF, reliably modulates neural excitation and can be turned on and off with millisecond precision, it marks a paradigm change in the way we can modulate neural activity in vivo, and is especially promising for conditions marked by excessive or runaway brain activity, such as epilepsy, Parkinson’s disease, chronic pain, and certain forms of depression or addiction,” Krishna Jayant, one of the researchers and a professor at Purdue University, said.
Injecting the chemical into fish and mice
For now, the system hasn’t been tested in humans, but the researchers did test the idea across several biological systems. In tissue samples, the polymer formed under physiological conditions. In zebrafish embryos, more than 80% survived and developed normally after the treatment, suggesting the reaction was relatively gentle in that model.
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The study authors tested the concept across several biological settings to see if the chemistry would hold. In basic tissue samples, the polymer formed under physiological conditions. In zebrafish embryos, more than 80 percent survived and developed normally, suggesting the reaction is relatively gentle.
The more critical test came in mice, where the material formed inside the brain after injection, with no significant toxicity or inflammation observed during the study period. The behavioral experiments made the effect tangible.
For instance, mice trained to press a lever stopped performing the task when the light activated the polymer and suppressed neural signals. When the light was turned off, their ability returned, indicating that the intervention temporarily altered activity without erasing learned behavior.
An important detail is where and how the control happens. Instead of affecting entire neurons in a broad way, the system can act on dendrites—the fine branches that process incoming signals.
“By enabling soft, blood-grown neural interfaces that can safely and reversibly tune activity in specific cell types and dendritic branches, the platform opens new routes to diagnose and treat brain disorders,” the study authors note.
A neural interface with great potential
If the results hold up beyond animal studies, this approach could offer a less invasive way to control abnormal brain activity in conditions like epilepsy or Parkinson’s disease, and that too without relying on rigid implants.
However, the method is far from ready for human use. It still requires injecting material into the brain, and many questions remain unanswered.
Researchers need to understand how long the polymer lasts, whether it builds up over time, and how precisely its formation can be controlled inside specific brain regions. These challenges will be the focus of future studies.
The study is published in the journal Science.