Topic: Biology

Scientists from L'Oréal and Queen Mary University of London discovered that human hair grows by being pulled upward by forces created by moving cells within the follicle, not pushed out as previously believed. This changes how we understand hair loss and regeneration.

New research has solved a long-standing mystery about how human hair grows. For decades, it was thought that hair grew by being pushed out from the root. But scientists have found that this is not true. Instead, hair is pulled upward by forces created by moving cells within the follicle.

The researchers used advanced 3D imaging to observe individual cells inside living human hair follicles grown in laboratory culture. They found that cells in the outer root sheath move along a spiral path downward within the same region where the upward pulling force is generated.

Dr. Inês Sequeira, one of the lead authors, explained: 'Our results reveal a fascinating choreography inside the hair follicle.' The team's findings challenge decades of biology textbook explanations and could influence how researchers approach hair loss and regeneration.

The study also highlights the importance of biophysics in modern biology. It shows how tiny mechanical forces at the microscopic level can shape the growth and behavior of structures in the human body.

Why It Matters

Understanding how hair grows is crucial for developing treatments for hair disorders and improving regenerative medicine. This new discovery could lead to breakthroughs in these areas, benefiting people worldwide.

Key Facts

• Scientists from L'Oréal and Queen Mary University of London discovered that human hair grows by being pulled upward by forces created by moving cells within the follicle.
• The researchers used advanced 3D imaging to observe individual cells inside living human hair follicles grown in laboratory culture.
• The study found that cells in the outer root sheath move along a spiral path downward within the same region where the upward pulling force is generated.

Key Terms

Outer Root Sheath

A layer of cells encasing the hair shaft that moves along a spiral path to pull the hair upward

Implications

Understanding how hair grows is crucial for developing treatments for hair disorders and improving regenerative medicine. This new discovery could lead to breakthroughs in these areas, benefiting people worldwide.