A team of scientists from the CONICET, in collaboration with the Helmholtz Center in Munich (Germany) and the University of Nottingham (United Kingdom), deciphered the mechanism that allows the zebrafish to regenerate damaged organs in just seven days.
The study, published in the journal Journal of Theoretical Biology, opens new perspectives for understanding tissue regeneration and its possible application in human medicine.
The neuromasts: key sensory organs
The zebrafish has structures called neuromasts, essential for detecting vibrations and movements in the water. Experiments showed that after suffering damage, the animal manages to reconstruct up to 90% of the affected organ in a week. It also recovers both functionality and its original size.
The key lies in a “local detection signal”: the surviving cells begin to multiply until they are surrounded by a specific number of neighbors of the same type. Once the original structure is reached, proliferation stops. This mechanism regulates regeneration and ensures that the tissue regains its shape and function.
Biological algorithms and stem cells
The neuromasts, formed by between 60 and 70 cells, can be completely reconstructed from just 4 to 10 surviving cells. When the damage is severe and few sustentacular cells remain, they acquire the ability of pluripotency. They act as stem cells generating all the cell types necessary for restoration.
This process was confirmed both in experiments with zebrafish larvae —damaged by laser— and in computational simulations designed in Argentina.
Implications for human medicine
The discovery could inspire new strategies to repair sensory organs in humans, such as the inner ear, where regeneration is limited.
According to researcher Natalia Lavalle, part of the genetic information linked to regeneration could persist in our DNA: “Understanding how cells ‘count’ how many neighbors they have and when to stop their proliferation can help us design strategies to recover sensory functions in humans.”
The zebrafish is a widely used research model because it shares a high percentage of genetic similarity with humans and because it can also regenerate the heart and the brain, in addition to the neuromasts.
Collaborative science
The project leader, Osvaldo Chara, highlighted the importance of interdisciplinary and international cooperation: “The integration of knowledge from different disciplines and international cooperation have been fundamental to advancing in this type of discovery.”
The CONICET study demonstrates that observing species with exceptional regenerative capabilities can be the key to developing innovative therapies in humans. The zebrafish, with its surprising ability to reconstruct organs in just seven days, becomes an inspiring model for the regenerative medicine of the future.
