Living Experiments
Researchers have demonstrated successful hair regrowth in laboratory settings, offering potential insights into treatments for hair loss. After approximately two weeks, scientists observed that hair follicles began to grow and form visible hair. The next step involved determining whether these cultivated hair follicles could function within a living organism.
In experiments conducted on mice, the hair follicles were transplanted into the skin. The follicles fully integrated with the host tissue, exhibiting a natural hair growth cycle – growing, shedding, and regrowing. This mirrors the process observed during natural hair growth, according to the study.
The research builds on previous findings that aging can affect the flexibility of stem cells within hair follicles, making it more tough to form fresh hair. Scientists from institutions including Northwestern University have been investigating ways to restore the pliability of these stem cells to stimulate hair production. The study, published in the scientific journal PNAS, points to the molecule MiR-205 as a key factor in revitalizing these cells.
Researchers found that increasing the production of MiR-205 could “soften” the stem cells within hair follicles, encouraging hair growth. This molecule specifically targets and activates older, dormant stem cells, prompting them to initiate hair production. “After 10 days, the hair began to grow again,” said Rui Yi, a professor of dermatology at the Northwestern University Feinberg School of Medicine. This discovery could have implications for addressing age-related hair loss, a common concern for many individuals.
The natural hair growth cycle typically lasts around five years, with stem cells deep within the skin actively contributing to hair growth. However, this growth eventually plateaus. Understanding how to reactivate these stem cells could potentially extend the growth phase and address hair loss issues.
