Single topical drop shows promise for triggering hair growth in mice

By AI, Created 5:00 AM UTC, May 25, 2026, /AGP/ – Researchers at Kyushu Dental University found that adhesive materials such as pyroxylin induced hair growth in mice, including older animals and multiple strains. The findings could point to a localized hair-loss treatment and a more efficient way to study hair regeneration.

Why it matters: - Hair loss treatments remain limited, and researchers are still looking for ways to reliably push resting follicles back into the growth phase. - The mouse model used in hair research can be slow and inefficient because of its long resting cycle, so a faster induction method could speed drug testing and reduce animal use. - Pyroxylin has a history of human use in wound covering and fixation, which may help future safety evaluation.

What happened: - A research group led by Professor Shoichiro Kokabu at Kyushu Dental University found that applying adhesive materials such as pyroxylin to shaved mouse skin induced clear hair growth in the treated areas. - The effect appeared in both male and female mice. - The effect was also confirmed across multiple mouse strains, in body sites beyond the back, and in middle-aged and elderly mice. - The findings were published in Scientific Reports in the paper titled “Pyroxylin shortens the resting stage of the hair cycle in mice.”

The details: - Histological analysis showed wound-like changes and an accumulation of inflammatory cells mainly in the superficial skin after pyroxylin treatment. - Hair follicles then elongated, and follicular structures formed with sebaceous glands. - Genes related to the hair cycle and hair follicle formation increased alongside hair growth progression. - The researchers concluded that adhesive materials may locally stimulate the skin surface and trigger inflammatory responses that move resting follicles into the growth phase. - The paper lists Shoichiro Kokabu, Kunikazu Tsuji, Chou Ying-Ying, Ayako Washio, Tomohiko Shirakawa, Yusuke Ono, Quan Yuan, Osamu Kaminuma and Takuma Matsubara as authors. - The study’s DOI is 10.1038/s41598-026-52804-0.

Between the lines: - The result came from a phenomenon observed during another experiment, which fits the pattern of scientific serendipity. - The work may matter beyond hair loss treatment because the method can assess hair growth induction at more than 20 skin sites per mouse. - That could make preclinical screening more efficient and potentially reduce the number of animals needed in experiments evaluating drug efficacy. - Professor Kokabu said the project was challenging because the team initially lacked tools, expertise and established knowledge in hair research. - The project also highlights the overlap between tooth and hair development, which the professor said are closely linked in embryonic biology.

What’s next: - The Kyushu Dental University team plans to clarify the cellular responses and molecular mechanisms behind the hair growth induction. - The method may also help identify hair growth-promoting substances and support drug evaluation. - The long-term goal is to develop new regenerative therapies that target hair follicles. - The university listed Professor Shoichiro Kokabu as the contact for the study.