Gray Hair: Natural Cancer Weapon?
- This article from Futura Sciences explains the science behind why hair turns gray and surprisingly,how this process might be a protective mechanism against cancer.
- * Melanocytes & Stem Cells: Hair color comes from melanocytes,specialized cells derived from stem cells located in hair follicles.
- In essence, the article suggests that gray hair isn't just an aesthetic change, but a sign that the body is actively trying to prevent cancer by eliminating damaged...
Summary of the article: Why Hair Turns gray & Its Link to Cancer Risk
This article from Futura Sciences explains the science behind why hair turns gray and surprisingly,how this process might be a protective mechanism against cancer. Here’s a breakdown:
* Melanocytes & Stem Cells: Hair color comes from melanocytes,specialized cells derived from stem cells located in hair follicles. These cells produce melanin.
* DNA Damage & the Choice: Over time, melanocyte stem cells can suffer DNA damage from stress, sun exposure, chemicals, or aging. They then face a critical decision: continue dividing or stop (withdraw from the process).
* Gray hair as a Protective Mechanism: Researchers found that when DNA is damaged, some stem cells choose to differentiate into mature melanocytes and then die. This reduces the number of pigment-producing cells, leading to gray hair, but also eliminates possibly cancerous cells. It’s a form of self-sacrifice.
* Two fates: Stem cells can either “exhaust” themselves (differentiate and die) or ”expand” (continue dividing).
* When Protection Fails: The protective mechanism breaks down when exposed to certain carcinogens like UVB rays, tobacco, or pollution. In these cases, a molecule called KIT encourages the damaged stem cells to continue dividing instead of stopping.
* Increased Cancer Risk: This uncontrolled proliferation of damaged cells increases the risk of developing melanoma (skin cancer).
In essence, the article suggests that gray hair isn’t just an aesthetic change, but a sign that the body is actively trying to prevent cancer by eliminating damaged cells. However, this protective mechanism isn’t foolproof and can be overridden by certain environmental factors, potentially leading to cancer progress.