Notícia

Ladders (EUA)

The reason why your hair has suddenly turned grey is…

Publicado em 23 janeiro 2020

Hair coloring might help temporarily solve going grey , but the underlying cause is likely due to stress, according to Harvard scientists.

Researchers from Harvard University discovered why prominent figures in time have suddenly had their hair turn white or gray. From Marie Antoinette’s hair allegedly turning white overnight as she awaited her fate during the French Revolution to the late Senator John McCain, who lost color in his hair after being a prisoner of war, researchers said extreme stress can start prematurely graying during the “fight-or-flight response,” which causes long-term, permanent damage to stem cells in hair follicles.

The study, published in the journal Nature , tested the theory on mice and found that graying started when the animals were forced to respond to danger.

“Everyone has an anecdote to share about how stress affects their body, particularly in their skin and hair — the only tissues we can see from the outside,” senior author Ya-Chieh Hsu, an associate professor of Stem Cell and Regenerative Biology at Harvard, said in a statement . “We wanted to understand if this connection is true, and if so, how stress leads to changes in diverse tissues. Hair pigmentation is such an accessible and tractable system to start with — and besides, we were genuinely curious to see if stress indeed leads to hair graying.”

In conjunction with researchers from the Center for Research on Inflammatory Diseases, the initial discovery happened when researchers were studying pain using black mice, where they administered resiniferatoxin in order to activate sensory nerve fibers and induce intense pain. Over the course of four weeks after the initial injection, one researcher found that the animals’ fur had turned completely white. Further tests found that the loss of melanocyte stem cells, which are found in hair follicles and determine hair color, during a stress-induced situation activates the “fight or flight” mentality.

“We set out to check the hypothesis that the loss of fur color resulted from pain-induced stress,” said Thiago Mattar Cunha, a researcher affiliated with the Center for Research on Inflammatory Diseases. “We designed a very simple experiment to see if the phenomenon was dependent on activation of sympathetic nerve fibers.”

Stem cells stop producing melanocytes as people age, thus when someone gets older, normally their hair can lose pigment and start turning grey. But in this study, they found that pain — or stress — actually started the aging of melanocytes stem cells earlier than predicted.

“In a young individual the cells are undifferentiated, like all stem cells, but with aging, they gradually differentiate. Once the process is complete they stop producing the melanocytes which produce melanin,” Cunha said. “We used various methodologies to show that intense sympathetic activity speeds up differentiation significantly. In our model, therefore, pain accelerated the aging of melanocyte stem cells.”

When these cells age prematurely, it spells for bad news: the damage is permanent, according to researchers.

Harvard researchers hope this study could lead to additional research that can “modify or block the damaging effects of stress.”

“By understanding precisely how stress affects stem cells that regenerate pigment, we’ve laid the groundwork for understanding how stress affects other tissues and organs in the body,” Hsu said. “Understanding how our tissues change under stress is the first critical step toward eventual treatment that can halt or revert the detrimental impact of stress. We still have a lot to learn in this area.”

Essa notícia também repercutiu nos veículos:
Jammu Links News (Índia) Yahoo! (Reino Unido) Archynetys (EUA) The Federal (Índia) The Week (Índia) online Daily Excelsior (Índia) online The Shillong Times (Índia) online Deccan Herald (Índia) online FarmWeek (Reino Unido) online PressBoltNews (Índia) The Indian Express (Índia) online The National (Reino Unido) online thisisoxfordshire (Reino Unido) Unique Media House (Nigéria) News Archyves UK Swanage & Wareham Voice (Reino Unido) More Radio (Reino Unido) EATG - European AIDS Treatment Group (Bélgica) News Archives Uk (Reino Unido) East Lothain Courier (Reino Unido) Basildon Echo (Reino Unido) Business Standard (Índia) online Science Codex Dunfermline Press (Reino Unido) News Medical (Austrália) FR24 News English (EUA) Chochilino Sky News (Reino Unido) BreakingNews.ie (Irlanda) BT Group (Reino Unido) Express & Star (Reino Unido) Evening Express (Reino Unido) online The Irish News (Reino Unido) online Bailiwick Express (Reino Unido) Teller Report The Independent (Reino Unido) online Droitwich Spa Advertiser (Reino Unido) Psychology Today (EUA) online News Archyves UK TheLiveFeeds.com Get To Info BioTech Times (Índia) Guernsey Press (Reino Unido) Jersey Evening Post (Reino Unido) online USA News (EUA) WhatsVibe (Nigéria) Ardrossan & Saltcoats Herald (Reino Unido) BanburyCake (Reino Unido) Barrhead News (Reino Unido) Barry & DistrictNews (Reino Unido) Brasildon Standard (Reino Unido) Belfast Telegraph (Reino Unido) Bicester Advertiser (Reino Unido) Advertizer (Reino Unido) Border Telegraph (Reino Unido) Borehamwood & Elstree Times (Reino Unido) Daily Echo (Reino Unido) Braintree & Witham Times (Reino Unido) Bridgwater Mercury (Reino Unido) Bridport News (Reino Unido) Burnham & Highbridge Weekly News (Reino Unido) Carrick Herald (Reino Unido) Central Fife Times (Reino Unido) Harrow Times (Reino Unido) Hampshire Chronicle (Reino Unido) East London Guardian Series (Reino Unido) Halesowen News (Reino Unido) Darlington and Stockton Times (Reino Unido) Dorset Echo (Reino Unido) Charg And Ilminster News (Reino Unido) Chelmsford & Mid Essex Times (Reino Unido) The Standard (Reino Unido) The Citizen (Reino Unido) Clacton Gazette (Reino Unido) Clydebank Post (Reino Unido) Coast FM - West Cornwall's (Reino Unido) County Press (Reino Unido) Craven Herald & Pioneer (Reino Unido) Cumnock Chronicle (Reino Unido) Hillingdon & Uxbridge Times (Reino Unido) Ikley Gazette (Reino Unido) Irvine Times (Reino Unido) The Keighley News (Reino Unido) The Kidderminster Shuttle (Reino Unido) online Knutsford Guardian (Reino Unido) Lancashire Telegraph (Reino Unido) The Leader (Reino Unido) Ledbury Reporter (Reino Unido) Leigh Journal (Reino Unido) Love Sport Radio (Reino Unido) Ludlow Advertiser (Reino Unido) Malvern Gazette (Reino Unido) Messenger Newspapers (Reino Unido) North Wales Chronicle (Reino Unido) The Mail (Reino Unido) Ayr Advertiser (Reino Unido) Bracknell News (Reino Unido) Bromsgrove Advertiser (Reino Unido) Denbighshire Free Press (Reino Unido) online Dudley News (Reino Unido) Enfield Independent (Reino Unido) Epping Forest Guardian (Reino Unido) Evesham Jounal (Reino Unido) The Packet (Reino Unido) Free Press (Reino Unido) Gazette & Herald (Reino Unido) The Gazette (Reino Unido) Greenock Telegraph (Reino Unido) Helensburgh Advertiser (Reino Unido) The Herald (Reino Unido) Hereford Times (Reino Unido) Impartial Reporter (Reino Unido) Milford Mercury (Reino Unido) News & Star (Reino Unido) News Shopper (Reino Unido) North Wales Pioneer (Reino Unido) Northwich Guardian (Reino Unido) Oxford Mail (Reino Unido) Peeblesshire News (Reino Unido) Penarth Times (Reino Unido) The Prestwich and Whitefield Guide (Reino Unido) Daily Hunt (Índia) Redditch Advertiser (Reino Unido) Redhill And Reigate Life (Reino Unido) Rhyl Journal (Reino Unido) Richmond and Twickenham Times (Reino Unido) The Romsey Advertiser (Reino Unido) Runcorn and Widnes World (Reino Unido) Salisbury Journal (Reino Unido) Shropshire Star (Reino Unido) Slough Observer (Reino Unido) County Gazette (Reino Unido) Southend Standard (Reino Unido) South Wales Argus (Reino Unido) South Wales Guardian (Reino Unido) St Albans Review (Reino Unido) St Helens Star (Reino Unido) Stourbridge News (Reino Unido) Surrey Comet (Reino Unido) Swindon Advertiser (Reino Unido) Tewkesbury Admag (Reino Unido) The Argus (Reino Unido) The Bolton News (Reino Unido) Fooshya The Gazette (Reino Unido) Daily Times (Paquistão) The Lancaster & Morecambe Citizen (Reino Unido) Tleay (Camboja) The Northern Echo (Reino Unido) The Oldham Times (Reino Unido) Telegraph & Argus (Reino Unido) Westmorland Gazette (Reino Unido) This is Lancashire (Reino Unido) This is Local London (Reino Unido) This is Money (Reino Unido) This is the West Country (Reino Unido) This is Wiltshire (Reino Unido) Thurrock Gazette (Reino Unido) Times & Star (Reino Unido) Barnet Times Series (Reino Unido) Tivyside Advertiser (Reino Unido) Wales Farmer (Reino Unido) Wharfedale Observer (Reino Unido) Whitchurch Herald (Reino Unido) The Whitehaven News (Reino Unido) Wilts and Glos Standard (Reino Unido) Estación Del Siglo (Argentina) Wimbledon Guardian (Reino Unido) The Royal Borough Observer (Reino Unido) Wirral Globe (Reino Unido) online Witney Gazette (Reino Unido) Worcester News (Reino Unido) Yeovil Express (Reino Unido) The Press (Reino Unido) The Andover Advertiser (Reino Unido) Basingstoke Gazette (Reino Unido) Southern Daily Echo (Reino Unido) Dumbarton and Vale Leven (Reino Unido) Ealing Times (Reino Unido) Harwich and Manningtree Standard (Reino Unido) Hexham Courant (Reino Unido) In-Cumbria Magazine (Reino Unido) Wandsworth Times (Reino Unido) Warrington Guardian (Reino Unido) Watford Observer (Reino Unido) Western Telegraph (Reino Unido) Your Local Guardian (Reino Unido) Devdiscourse (Índia) Daily Hunt (Índia) Stem Cell Clinic Oriya News Report Ciencias Medicas News (Argentina) Ansa Latina (Argentina) ItaliaSalute (Itália) Rai News (Itália) Gazzetta del Sud (Itália) online Dagospia (Itália) Corriere della Sera (Itália) Giornale di Brescia (Itália) l'Adige (Itália) online LadyBlitz (Itália) La Stampa (Itália) online Blog Psicologisti (Itália) Tgcom24 (Itália) The Irish News (Reino Unido) online Guernsey News (Reino Unido) InfoSurHoy (EUA) The World News Yahoo! (Reino Unido) AOL UK (Reino Unido) Asian Image (Reino Unido) Brentwood Live (Reino Unido) The Bury Times (Reino Unido) online Cotswold Journal (Reino Unido) Powys County Times (Reino Unido) online Gazette Series (Reino Unido) The Herald (Reino Unido) Irish Examiner (Irlanda) online ITV Hub (Reino Unido) Largs & Millport News (Reino Unido) online MSN (Canadá) Stroud News & Journal (Reino Unido) Wiltshire Times (Reino Unido) Jeuxvideo.com (França) Slate.fr (França) Yahoo! (França) Epoch Times França Press From Brasil (EUA) Femme Actuelle (França) online La Presse (Canadá) Le Miroir Info Accueil L'Union (França) online MSN (Canadá) NEON (França) online Sciences et Avenir (França) online Pioneer News Chochilino The Economic Times (Índia) Head Topics (Brasil) hotindionline.com Yahoo! Lifestyle India (Índia) Indian Express (Índia) The Tribune (Chandigarh, Índia) online The Dragon Times The World News (Ucrânia) Top News Wood Trending News 365 AEDaily (Vietnã) Asianet (Índia) Info news Outlook India (Índia) The Telegraph (Reino Unido) The Hans India (Índia) online Tleay (Camboja) Today (Itália) Sky TG24 (Itália) Il Messaggero (Itália) online Lezioni Europa (Itália) PerugiaToday (Itália) Universo Mamma (Itália) Club de Sănătate PS News (Romênia) Albina Romaneasca (Itália) Ce se intampla, Doctore? (Romênia) Digi World (Romênia) Ciencias Medicas News (Argentina) Bloomberg (EUA) News List Jammu Links News (Índia) Canada News (Canadá) Biotech News (Austrália) Giornale di Sicilia (Itália) online Barron's Nestia (Singapura) Jewel 88.5 FM (Canadá) Sansara Nepal BBC Mundo (Reino Unido) IFLScience (Reino Unido) aponet.de (Alemanha) News18 (Índia) EN24 News aponet.de (Alemanha) The Harvard Crimson Time 24 News (EUA) PressReader (Canadá) Yahoo Sport France (França) BBC (Reino Unido) Giornale di Sicilia (Itália) online