For many years, biology textbooks have explained hair growth in a simple way. They say that new cells form at the bottom of the hair root. As these cells divide and multiply, they push older cells upward.
Over time, the older cells harden and form the hair shaft that we see growing from our skin. This idea has been widely accepted for decades and has shaped how scientists think about hair growth and hair loss.
However, a new scientific study suggests that this explanation may not be correct. Researchers have now discovered that hair may not be pushed out of the skin at all. Instead, it appears to be pulled upward by a hidden network of moving cells inside the hair follicle.
The research was carried out by scientists from L’Oréal Research & Innovation and Queen Mary University of London. Their findings were published in the scientific journal Nature Communications. The discovery could change how scientists understand hair growth and may help guide future treatments for hair loss and scalp disorders.
To understand the discovery, it helps to know a little about how hair follicles work. Each strand of hair grows from a tiny structure in the skin called a hair follicle.
A follicle sits below the surface of the skin and surrounds the base of the hair. Inside the follicle are several layers of cells that support and guide hair growth. One important layer is called the outer root sheath. This layer wraps around the growing hair shaft and protects it.
In the past, scientists mainly studied hair follicles using still images from microscopes. These images could show the structure of the follicle, but they could not show how the cells move in real time.
In this new study, the researchers used advanced three‑dimensional live imaging technology. This method allowed them to keep human hair follicles alive in the laboratory and observe individual cells moving inside them over time.
What they saw was surprising. Cells in the outer root sheath were not staying still. Instead, they were slowly moving downward in a spiral pattern around the follicle. Even more interesting, these moving cells appeared to generate the force that caused the hair shaft to move upward.
Dr. Inês Sequeira from Queen Mary University of London, one of the lead researchers on the study, explained that the hair follicle behaves like a tiny biological motor.
As the cells in the outer root sheath move and contract, they create a pulling force that lifts the hair upward. This means that hair growth may be driven by mechanical forces created by moving cells, rather than by cells simply pushing from below.
To test whether their idea was correct, the scientists performed an important experiment. They blocked cell division inside the hair follicle.
According to the traditional model, hair growth should have stopped if new cells were not dividing and pushing the hair upward. But this is not what happened. Even when cell division was blocked, the hair continued to grow almost normally.
The researchers then tried another experiment. They disrupted a protein called actin. Actin is important because it helps cells move and generate force. When the scientists interfered with actin activity, hair growth slowed dramatically.
In fact, the growth rate dropped by more than eighty percent. This result strongly suggested that cell movement and pulling forces play a major role in hair growth.
The team also used computer simulations to better understand what they were seeing. These models showed that the speed of hair growth observed in the experiments could only be explained if a pulling force was present inside the follicle.
Dr. Nicolas Tissot from L’Oréal Research & Innovation said that the study became possible because of the new imaging technology used by the team.
Real‑time three‑dimensional time‑lapse microscopy allows scientists to watch living cells as they move and interact. Unlike traditional images that capture only a single moment, this technology reveals how biological systems work over time.
Another researcher involved in the study, Dr. Thomas Bornschlögl, said the findings could have important medical implications.
Understanding the physical forces involved in hair growth may help scientists develop better ways to treat hair loss conditions. It may also improve how new drugs are tested on living hair follicles and help guide future work in regenerative medicine.
The study also highlights the growing importance of biophysics, a field that studies how physical forces affect living systems. Scientists are beginning to realize that many biological processes depend not only on chemical signals but also on movement and mechanical forces inside cells and tissues.
Hair growth may seem like a simple and everyday process, but this research shows that it is powered by a complex system of moving cells working together like a tiny engine. Discoveries like this remind us that even familiar parts of the human body can still hold surprising secrets waiting to be uncovered.
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