They Unleashed a Hidden Power in Their Gaze… and Could Heal Millions

For several decades, researchers have explored a way as fascinating as it is bold: the regeneration of cells in the eye. Their ambition? Reactivate a potential buried in our biology, inspired by superpowers … Zebroken fish.

A small fish, a huge potential

This tropical little tropical fish is a real star of regeneration. Unlike humans, he can reconstruct a fin, part of his heart – and above all, restore his vision after a retinal injury. How ? Thanks to glial cells called Müller cells, which support neurons in the retina. When a lesion occurs, these cells turn into real stem cells, capable of generating new photoreceptors, these light sensors essential to vision.

But among mammals – and therefore with us – this mechanism seems to be locked. Scientists have long been looking for the key that could reactivate this forgotten power.

A breakthrough from South Korea

This is where the team of the Korean Institute of Sciences and Technologies (KAIST) comes in. In a study published in Nature Communicationsthe researchers describe a spectacular advance: they managed to induce a functional retinal regeneration in mice, a mammal like us.

Their target: a protein called Prox1, present in Müller's glial cells. This protein acts as a molecular brake: after an injury, it prevents cells from turning into neurons. By neutralizing Prox1, the researchers allowed these cells to resume their transformation potential. Result: in mice with pigmentary retinitis, new retinal neurons appeared, with a partial recovery of the vision … which lasted more than six months.

A first in a mammal

It is the first time that such a sustainable level of neuronal regeneration has been observed in the retina of a mammal. And this, without resorting to external stem cells, nor to electronic implants. All magic comes from the animal's own biological potential, simply reactivated.

This approach could upset our way of considering degenerative diseases: instead of compensating for a loss, we could repair damaged tissues at the source.

And elsewhere in the world?

This discovery is added to a series of recent advances in the race for ocular regeneration. In 2019, researchers identified another molecular route, called Hippo, which maintains the state of rest of the glial cells. By deactivating it, they were able to initiate a beginning of cell reprogramming.

Three years later, in 2022, a study showed that some amphibians had peripheral stem cells in the eye, capable of producing new neurons after a lesion. And in another more technological approach, researchers work on gold nanoparticles activated by laser, which could bypass damaged photoreceptors to partially restore vision.

The eye, this ultimate challenge

The retina is a complex fabric, composed of several interconnected neuronal layers, and in permanent interaction with the brain. This makes her a real laboratory of neuro regeneration, but also a scientific puzzle. The slightest error in the wiring of newly formed neurons can prevent any functional recovery.

This is why the Korean study is so promising: not only have new neurons appeared, but they have integrated into the existing visual circuit, with a measurable result on perception. It is a strong signal: the natural regeneration of retinal neurons among mammals is no longer a fantasy.

Towards a future without blindness?

Of course, it will take time before these results are transposed to humans. Other tests, other validations, and probably other locks to blow up. But hope is there, more concrete than ever.

Ultimately, this approach could transform the management of vision pathologies, but also pave the way for the regeneration of other neural tissues: spinal cord, brain, optic nerve …

What we take for fatality – degeneration – could soon become a reversible process. And this, thanks to a small tropical fish, a malicious protein … and a good dose of human ingenuity.