Creating a Wireless Bridge Between Light and Living Cells
Summary:
An international team of researchers has developed injectable, hollow semiconducting nanoparticles that act as microscopic light receptors inside blind eyes. When illuminated, these particles wirelessly trigger remaining retinal nerve cells to send visual signals to the brain, restoring measurable light responses in models of retinitis pigmentosa.
Source: Aarhus University
In neurodegenerative blinding diseases such as retinitis pigmentosa, the eye’s primary light-capturing photoreceptors gradually deteriorate and die. However, deeper down in the retinal circuitry, secondary nerve cells, such as retinal ganglion cells, often remain healthy and functional. For years, neuroengineers have sought a way to recruit these surviving neurons to bypass lost photoreceptors entirely.
Now, a multi-institutional study published in Nature Biomedical Engineering demonstrates a significant step forward: injectable, light-sensitive nanoparticles capable of restoring light perception to blind retinas.
Led by Associate Professor Menglin Chen at Aarhus University, the international research team engineered hollow nanoparticles composed of graphitic carbon nitride, a semiconductor highly sensitive to visible light. Measuring approximately 300 nanometers wide, the structures take architectural inspiration from plant chloroplasts to harvest photon energy efficiently.
“When we started, our fundamental question was whether we could create a material that could act as a wireless interface between light and living cells. We can now see that the particles are able to activate nerve cells in blind retinas. That brings us closer to our long-term goal of developing a new type of retinal prosthesis,” said Dr. Chen.
When exposed to light, the graphitic carbon nitride particles induce local physical and chemical reactions in their immediate environment, generating signals that stimulate adjacent living cells.
To test whether this physical interface could substitute for lost photoreceptors, the team injected the particles into the eyes of mice suffering from advanced retinitis pigmentosa. The nanoparticles settled on the retinal surface, resting close to retinal ganglion cells,the primary conduits that relay visual information to the brain.
Upon illumination, the researchers detected clear evoked electrical activity in the mice’s visual cortex. Furthermore, the blind mice displayed measurable behavioral adjustments in response to light exposure. The team verified the finding across species, showing that the nanoparticles could also stimulate ganglion cells in isolated retinal tissue harvested from pigs.
“What is particularly interesting is that we are trying to make use of the nerve cells that still function in the retina. Instead of genetically modifying these cells, we use the nanoparticles to create a new connection between light and the nerve cells. In this way, we are trying to make a blind retina respond to light again,” said Chen.
Current restorative vision strategies face significant clinical trade-offs. Traditional electronic retinal implants require invasive ocular surgeries and bulky hardware. Gene therapies can fix failing tissue but are limited to specific known genetic mutations, while optogenetics requires genetically editing surviving neurons using viral delivery systems.
“Once the photoreceptors are lost, the options for restoring light sensitivity are still very limited, and each approach in development carries its own constraint,” explained co-author and retina specialist Henri Leinonen. “That is why it is worth testing strategies that work independently of the cause of the disease. What we show here is a light-evoked response in a degenerated retina, which is an early step rather than a finished prosthesis.”
While the technology does not yet restore high-acuity, normal vision, it proves that microscopic “photovoltaic” particles can establish an effective wireless link with degenerated mammalian neural circuits. The research team has filed international patents for the technology and is currently investigating long-term ocular biocompatibility, delivery optimization, and stability as they work toward eventual human clinical trials.
Abstract
Biomimetic graphitic carbon nitride nanoparticles for multiscale photomodulation and therapeutic intervention
Most organic matter on Earth originates from the conversion of solar energy through photosynthesis in chloroplasts. Here, drawing inspiration from photosynthesis, we develop hollow-sphere graphitic carbon nitride nanoparticles (hg-C₃N₄ NPs) that can modulate biological activity from subcellular processes to whole‑tissue function.
The homogeneous hg-C₃N₄ NPs show responsiveness to light via both photoelectrochemical and photothermal mechanisms and can be spontaneously internalized with excellent cytocompatibility. Using a focusing laser, the hg-C₃N₄ NPs enable intracellular optical stimulation with subcellular resolution, inducing calcium-transient release in multiple cells and propagation in primary cardiomyocytes and cardiac fibroblasts.
At the multicellular scale, optical pacing and synchronization of cardiomyocyte beating is readily achieved by light-emitting diodes. Further, we demonstrate that hg-C₃N₄ nanoparticles can be safely delivered and elicit measurable cortical and behavioural light responses in a model of advanced retinal degeneration.
The application of hg-C₃N₄ NPs to porcine retinal tissue ex vivo confirms their modulation capability to directly activate retinal ganglion cell activity under light-emitting diode photostimulation.
Taken together, hg-C₃N₄ NPs represent a versatile tool to address complex biomedical challenges through subcellular, intercellular and tissue-level photo-modulation.
Your email address will not be published. Required fields are marked *
Comment *
Name *
Email *
Website
Notify me of follow-up comments by email.
Notify me of new posts by email.

Neuroscience News Sitemap
Neuroscience Graduate and Undergraduate Programs
Free Neuroscience MOOCs
About
Contact Us
Privacy Policy
Submit Neuroscience News
Subscribe for Emails
Neuroscience Research
Psychology News
Brain Cancer Research
Alzheimer’s Disease
Parkinson’s News
Autism / ASD News
Neurotechnology News
Artificial Intelligence News
Robotics News
Neuroscience News is an online science magazine offering free to read research articles about neuroscience, neurology, psychology, artificial intelligence, neurotechnology, robotics, deep learning, neurosurgery, mental health and more.

source