💡 Nanoparticles Helped Blind Mice Respond to Light Again
Researchers at Aarhus University in Denmark have developed a method that can make a blind eye respond to light again. Nanoparticles are injected into the eye, where they respond to light and activate surviving retinal neurons, bypassing dead photoreceptors. The researchers see the technology as a potential "injectable retinal prosthesis."
In some eye diseases, photoreceptors-the cells that convert light into neural signals-gradually disappear. But the neurons that normally carry those signals to the brain can remain intact.
The researchers found a way to reconnect them with light. They created hollow carbon nitride nanoparticles about 300 nm in diameter, with a structure inspired by chloroplasts-the parts of plant cells that capture light. After injection, the particles settle on the retina near surviving neurons and help activate them when exposed to blue light.
🔍 The team tested the approach in blind mice. One month after the injection, 3 of 7 mice began preferring the dark side of their enclosure, similar to healthy mice. The control animals showed no such preference. The researchers also detected light-triggered activity in the visual cortex in 5 of 14 treated eyes, compared with 1 of 14 control eyes. With such a small sample, however, the difference was not statistically significant.
The effect was also demonstrated in isolated pig retina: after the nanoparticles were added, light increased the firing rate of retinal neurons almost sixfold.
✅ The researchers now want to deliver the nanoparticles beneath the retina and make them responsive to red and infrared light. If the technology can be developed further, it could eventually offer a much simpler alternative to surgically implanted electronic retinal prostheses.
@hiaimediaen
Researchers at Aarhus University in Denmark have developed a method that can make a blind eye respond to light again. Nanoparticles are injected into the eye, where they respond to light and activate surviving retinal neurons, bypassing dead photoreceptors. The researchers see the technology as a potential "injectable retinal prosthesis."
In some eye diseases, photoreceptors-the cells that convert light into neural signals-gradually disappear. But the neurons that normally carry those signals to the brain can remain intact.
The researchers found a way to reconnect them with light. They created hollow carbon nitride nanoparticles about 300 nm in diameter, with a structure inspired by chloroplasts-the parts of plant cells that capture light. After injection, the particles settle on the retina near surviving neurons and help activate them when exposed to blue light.
🔍 The team tested the approach in blind mice. One month after the injection, 3 of 7 mice began preferring the dark side of their enclosure, similar to healthy mice. The control animals showed no such preference. The researchers also detected light-triggered activity in the visual cortex in 5 of 14 treated eyes, compared with 1 of 14 control eyes. With such a small sample, however, the difference was not statistically significant.
The effect was also demonstrated in isolated pig retina: after the nanoparticles were added, light increased the firing rate of retinal neurons almost sixfold.
✅ The researchers now want to deliver the nanoparticles beneath the retina and make them responsive to red and infrared light. If the technology can be developed further, it could eventually offer a much simpler alternative to surgically implanted electronic retinal prostheses.
@hiaimediaen