These cells actually move around between different zones of the hair root.
A lo largo de la historia, las canas han sido aceptadas como un signo inevitable del paso del tiempo, pero una investigación de la Universidad de Nueva York publicada en Nature desafía esa certeza. Los científicos han descubierto que las células madre melanocíticas, responsables del pigmento capilar, no están condenadas a la inactividad: se mueven, y esa movilidad podría ser la clave para revertir el encanecimiento. Es un hallazgo que no cambia el mundo de inmediato, pero sí reescribe lo que creíamos saber sobre el envejecimiento visible.
- Por primera vez, los investigadores han identificado un mecanismo celular concreto que explica por qué el cabello pierde su color, abriendo una puerta que antes parecía cerrada.
- El descubrimiento de que las células madre melanocíticas se desplazan dentro de la raíz del cabello contradice décadas de suposiciones científicas y sacude el campo de la dermatología capilar.
- El equipo de Mayumi Ito en la NYU trabaja para entender cómo controlar esa movilidad celular, con la esperanza de desarrollar tratamientos que prevengan o reviertan las canas.
- Mientras la ciencia avanza, millones de personas siguen recurriendo a soluciones provisionales: aceite de romero, infusiones de té negro y técnicas de salón como el smokey hair para convivir con las canas.
- El camino desde el laboratorio hasta la farmacia es largo, pero la investigación marca un punto de inflexión: las canas ya no son un destino biológico inamovible.
Las canas han sido durante mucho tiempo una realidad del envejecimiento que se acepta, se disimula o se combate con tinte. Pero un nuevo estudio de la Universidad de Nueva York, publicado en la revista Nature, sugiere que el proceso podría ser reversible: que los mechones blancos y plateados que aparecen con la edad podrían recuperar su color original.
El mecanismo no es un misterio. Las canas surgen porque las células madre melanocíticas, encargadas de producir pigmento, se quedan bloqueadas. Cuando esto ocurre, la producción de melanina cae y el cabello pierde su color. La pregunta era si era posible desbloquearlas. La investigadora principal, Mayumi Ito, y su equipo descubrieron algo inesperado: estas células no permanecen inmóviles en un punto fijo de la raíz, sino que se desplazan entre distintas zonas. Esa movilidad es crucial. Si se pudiera controlar ese movimiento, quizás sería posible prevenir las canas o incluso revertirlas.
Las implicaciones son considerables, y algunos investigadores ya imaginan tratamientos, productos cosméticos y terapias basadas en estos hallazgos. Pero ese futuro aún está lejos. Traducir este conocimiento en algo disponible en una farmacia requiere mucho más trabajo.
Mientras tanto, quienes conviven con las canas siguen usando las herramientas disponibles: el aceite de romero, conocido por sus propiedades antioxidantes y su capacidad para oscurecer temporalmente el cabello, o técnicas de salón como el smokey hair, que integra mechas en tonos plateados para que las canas se fundan con el conjunto en lugar de destacar.
Pero la verdadera noticia es científica. Por primera vez, los investigadores tienen un mecanismo celular concreto que pueden estudiar y, potencialmente, manipular. Las canas no son tan inevitables ni irreversibles como siempre se creyó. Los botes de tinte quizás no desaparezcan mañana, pero la investigación apunta a que podrían no ser necesarios para siempre.
Gray hair has long been a fact of aging that people accept, cover up, or fight with dye. But a new study from researchers at New York University, published in the journal Nature, suggests the process might actually be reversible—that the white and silver strands creeping in with age could potentially be turned back to their original color.
The mechanism is simpler than you might expect. Gray hair isn't a mystery. It happens because melanocyte stem cells, the ones responsible for producing pigment in hair, get stuck. When these cells stall, melanin production drops, and the hair loses its color, turning white or gray. The question scientists have been asking is whether you could unstick them.
Mayumi Ito, the lead researcher on the study, and her team at NYU made a discovery that changes how we understand these cells. They had assumed melanocyte stem cells stayed dormant in one fixed location within the hair root, activating only when needed to produce pigmented cells. But the new research shows something different: these cells actually move around. They travel between different zones of the hair root. This mobility, it turns out, is crucial. If researchers could figure out how to control that movement—how to keep these cells mobile and active—they might be able to prevent gray hair from appearing in the first place, or even reverse it once it has.
The implications are significant enough that some researchers are already imagining what comes next: treatments designed to stimulate these stem cells, cosmetic products, even therapies built on these findings. But that future is still distant. The cells are more flexible and dynamic than anyone realized, but translating that knowledge into something you can buy at a pharmacy or apply at home requires much more work.
For now, people dealing with gray hair are still working with the tools available. Some turn to natural remedies. Rosemary, the herb most people know from cooking, has been used in traditional medicine and hair care for years. Its antioxidant properties and ability to stimulate the scalp can temporarily darken gray or white hair and make it less noticeable. Rosemary oil is particularly popular in treatments aimed at restoring natural color. Black tea and chamomile infusions offer similar effects.
There's also the salon approach. A technique called smokey hair has become trendy—it uses balayage highlights in various silver and gray tones, with gray tips, to blend grays throughout the hair rather than hide them. The mixed colors create volume and a rejuvenating effect while making the grays disappear into the overall look.
But the real story here is the science. For the first time, researchers have a concrete mechanism they can target. They know gray hair isn't inevitable or irreversible in the way people have always assumed. It's a cellular process, and cellular processes can be manipulated. The dye bottles might not disappear tomorrow, but the research suggests they might not be necessary forever.
Notable Quotes
The way to increase melanin production and recover the hair's original color is to reactivate the melanocyte stem cells— Mayumi Ito, lead researcher
The Hearth Conversation Another angle on the story
So if these stem cells are moving around in the hair root, why do they get stuck in the first place? What causes the stalling?
The study identifies that stalling happens, but the research doesn't fully explain why yet. That's part of what needs more investigation. The breakthrough is understanding that the cells move at all, and that movement matters.
And if someone already has gray hair, could this treatment work on them, or only prevent new gray hairs from forming?
The research suggests both might be possible—reversing existing gray and preventing new ones. But that's the theoretical promise. The actual mechanism for reactivating stuck cells in hair that's already turned gray is still being worked out.
How long before this is something people can actually use?
That's the honest answer: nobody knows yet. The science is real, but there's a long road from understanding a cellular process to creating a safe, effective treatment. Years, probably.
In the meantime, does rosemary oil actually work, or is that just folklore?
It can help temporarily darken hair and make grays less visible, especially with regular use. It's not going to turn gray hair back to its original color, but it's a real effect, not just placebo.
Why does this matter beyond vanity? Why should someone care if their hair turns gray?
For some people it's purely cosmetic. But aging is a biological process, and understanding how to reverse or control one aspect of it—even something as visible as hair color—opens doors to understanding aging more broadly. That's why Nature published it.