Induction of a Regenerative State in Hair Follicle Stem Cells by Helium Plasma-Activated Medium Through Coordinated Regulation of Regenerative Programs
This study demonstrates that helium plasma-activated medium induces a coordinated regenerative state in hair follicle stem cells by simultaneously enhancing metabolic and migratory activities while upregulating key genes associated with stem cell activation, migratory competence, and epithelial plasticity.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of a preprint that has not been peer-reviewed. It is not medical advice. Do not make health decisions based on this content. Read full disclaimer
Hair grows in cycles, a quiet rhythm of dormancy and activity managed by a small reservoir of stem cells tucked away in the follicle. These cells are the body's repair crew, capable of waking up to replace lost hair or heal a cut, but they often remain asleep until signaled to move. For decades, scientists have sought ways to wake these cells up more effectively, looking for methods that are safe and precise. One emerging tool is cold atmospheric plasma, a stream of ionized gas that feels like room temperature air but carries a complex mix of charged particles and reactive molecules. When this plasma touches a liquid, it creates a "plasma-activated medium," a solution filled with these reactive species that can talk to cells without burning them. The question researchers have been asking is whether this liquid can specifically wake up the hair follicle stem cells and guide them to do their job better.
A team of researchers at Kharazmi University and collaborators set out to answer this by testing a specific type of this plasma-activated liquid, made using helium gas, on hair follicle stem cells taken from rats. They wanted to see if this treatment could improve the cells' energy levels, their ability to move, and their genetic instructions for regeneration. The scientists isolated the stem cells from the whisker pads of rats, a region known to house these vital cells, and grew them in a dish. They then exposed the cells to the helium plasma-activated liquid for varying amounts of time and at different electrical voltages to find the perfect recipe. They were looking for a balance: too much plasma might harm the cells, but the right amount could act as a gentle nudge to start the healing process.
The results showed that the treatment worked, but only under very specific conditions. When the cells were exposed to the liquid generated at 14 kilovolts for 30 seconds, or at 12 kilovolts for 60 seconds, they became significantly more active. These treated cells consumed more energy and moved across the dish much faster than untreated cells, closing a simulated wound in the cell layer to a greater extent after a fixed 48-hour period. This movement is crucial because, in a real injury, stem cells must travel to the damaged site to begin repair. The researchers found that the cells treated with the 12 kilovolt, 60-second dose showed the highest wound closure rate at 92.4%, compared to 82.6% for the 14 kilovolt, 30-second dose, both significantly outperforming the control group's 59.8%.
Digging deeper into what was happening inside the cells, the team looked at the genes that control the cells' behavior. They found that the treatment did not just make the cells move faster; it rewired their internal instructions to prepare for regeneration. The cells turned up the volume on genes responsible for waking up from a dormant state, genes that help them migrate toward a wound, and genes that allow them to change their shape and adapt to new environments. Specifically, the treatment caused a massive increase in a gene called CXCR4, which acts like a compass guiding cells to repair sites, and boosted genes known to control the hair growth cycle. At the same time, the cells increased the production of genes that allow them to switch between different cell states, a flexibility that is essential for successful tissue repair.
The study suggests that this helium-based liquid acts as a coordinated signal, telling the stem cells to wake up, get ready to move, and become flexible enough to rebuild tissue. The researchers noted that this effect is highly dependent on the settings used; other combinations of voltage and time either did nothing or actually slowed the cells down, highlighting that the dose must be precise to be beneficial. While the study was conducted in a laboratory dish and did not test hair growth on living animals, the findings provide a strong foundation for understanding how plasma medicine might one day be used to treat hair loss or speed up wound healing. The work points to a future where a simple, non-invasive spray of plasma-activated liquid could help the body's own stem cells do their work more effectively, turning a dormant repair crew into an active force for regeneration.
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