Thursday, 23 Jan 2020 04:00 PM MYTWASHINGTON, Jan 23 — Marie Antoinette’s hair turned white overnight, according to folklore, before she was executed by guillotine in 1793 during the French Revolution. The ill-fated queen embodied an extreme example of the phenomenon of stress-induced greying of the hair.
The researchers used mouse experiments to look at how stress affects the stem cells in hair follicles that are responsible for making melanocytes, the pigment-producing cells that give hair its colour — black, brown, blonde, red or somewhere in between. People generally have around 100,000 hair follicles on their scalp.
Instead they found that the body’s sympathetic nervous system, which governs the mammalian “fight-or-flight” response to danger, played a central role. It comprises a network of nerves that go everywhere including the skin, in which they are like ribbons wrapping around each hair follicle and are very close to the melanocyte stem cells.
“Normally, when hair regenerates, some of these stem cells convert into pigment-producing cells that colour the hair. But when they are exposed to norepinephrine from the sympathetic nerve, all of the stem cells are activated and convert into pigment-producing cells,” said Ya-Chieh Hsu, associate professor of stem cell and regenerative biology at Harvard University and a Harvard Stem Cell Institute principal investigator.
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