The adult brain may possess a hidden ability to revert to an embryonic state
In short: For decades, we believed the adult brain was a static, immutable organ. But new research suggests that when brain cells are injured, they might actually travel back in time, adopting an immature state to regrow lost connections and potentially restore function.
Until roughly twenty years ago, the scientific consensus viewed the adult brain as a terminally differentiated and fixed structure. However, the discovery of neurogenesis—the continuous production of new cells in the hippocampus and subventricular zone—challenged this notion of a static organ. Recent findings from the University of California, San Diego, now suggest this regenerative capacity may be much more widespread than previously thought. This ongoing replenishment of specific brain regions is a key component of neurogenesis, a process scientists are currently investigating to see if it can be harnessed to reverse neurodegenerative diseases.
According to research published in the April 15, 2020, issue of Nature, scientists led by Mark Tuszynski, MD, PhD, have identified a transcriptional roadmap for regeneration. Using mouse models, the team discovered that when adult cortical neurons are injured, they undergo a profound transformation. These mature cells revert to an embryonic-like state, a process that allows them to regrob axons if they are provided with a suitable environment for growth. By utilizing advanced tools like molecular genetics, virology, and computational power, the researchers were able to map out how the entire set of genes in these cells resets itself during this regenerative process.
This mechanism offers a potential pathway for treating devastating conditions like Alzheimer’s, Parkinson’s, and spinal cord injuries. While the challenge of repairing the central nervous system remains one of medicine's most daunting tasks, progress is being made through multidisciplinary approaches. For instance, researchers including Kobi Koffler, PhD, and Shaochen Chen, PhD, have explored using 3D-printed implants in rats to promote nerve cell growth across injury sites, aiming to reconnect severed nerves and restore lost functions. The team's work builds upon the foundational concept of neurogenesis established by researchers such as Fred "Rusty" Gage. Such advancements in neural stem cell grafting could eventually help induce neurons to extend axons through injury sites to reconnect severed nerves.
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Sources
- Summary by Intellect · source: Could your brain repair itself? - Ralitsa Petrova
- Also: Ralitsa Petrova: Could your brain repair itself? | TED Talk
- Also: When damaged, the adult brain repairs itself by going back to the beginning | ScienceDaily
- Also: ed.ted.com — Could your brain repair itself? - Ralitsa Petrova | TED-Ed
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