A Widely Accepted Theory of Hair Growth Has Been Overturned by Scientists

New Insights Into Hair Growth Mechanisms

According to НВ — Техно: Research conducted by scientists from L'Oréal Research & Innovation and Queen Mary University of London has challenged the long-standing belief that hair growth is driven by cell division. Instead, the team found that a hidden tensile force-generated by the coordinated movement of cells in the outer root sheath-is what actually propels hair upward. These findings were published in the journal Nature Communications.

Using real-time 3D imaging technology, the researchers observed living human hair follicles grown in a lab setting. They discovered that cells in the outer root sheath move downward along a complex spiral path, a process that is essential for hair elongation. In an experiment where cell division within the follicle was blocked, hair growth did not stop, further supporting the new conclusions.

The Role of Actin Protein in Hair Growth

The study also revealed that disrupting the activity of the actin protein caused hair growth rates to drop by more than 80 percent. Computer modeling confirmed that the mechanical forces exerted by outer layer cells are sufficient on their own to move the hair shaft, calling into question traditional views on how hair grows.

These results could fundamentally change our understanding of the biological processes behind hair growth and open up new avenues for further research. By overturning conventional theories, this discovery may influence the development of novel treatments for hair loss and improve cosmetic products containing hair-stimulating ingredients. This research could serve as a foundation for new strategies in trichology and dermatology.