{"id":22145,"date":"2025-04-30T12:02:41","date_gmt":"2025-04-30T12:02:41","guid":{"rendered":"https:\/\/site.itshrt.com\/worldnews\/humans-wounds-heal-much-more-slowly-than-other-mammals\/"},"modified":"2025-04-30T12:02:41","modified_gmt":"2025-04-30T12:02:41","slug":"humans-wounds-heal-much-more-slowly-than-other-mammals","status":"publish","type":"post","link":"https:\/\/site.itshrt.com\/worldnews\/humans-wounds-heal-much-more-slowly-than-other-mammals\/","title":{"rendered":"Humans\u2019 Wounds Heal Much More Slowly Than Other Mammals\u2019"},"content":{"rendered":"<p> <script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6606220950177433\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<!-- ItShrt World News -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-client=\"ca-pub-6606220950177433\"\r\n     data-ad-slot=\"1882483372\"\r\n     data-ad-format=\"auto\"\r\n     data-full-width-responsive=\"true\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\r\n<br \/>\n<\/p>\n<div data-testid=\"companionColumn-0\">\n<div class=\"css-53u6y8\">\n<p class=\"css-at9mc1 evys1bk0\">Watching wild baboons in Kenya, Akiko Matsumoto-Oda, an evolutionary biologist and primatologist at the University of the Ryukyus in Japan, had a front-row seat to the violence between these monkeys, especially the males.<\/p>\n<p class=\"css-at9mc1 evys1bk0\">\u201cI was struck by how frequently they sustained injuries,\u201d she said, \u201cand, even more, by how rapidly they recovered \u2014 even from seemingly severe wounds.\u201d<\/p>\n<p class=\"css-at9mc1 evys1bk0\">Compared with her own experiences with nicks and cuts, the baboons\u2019 ability to heal seemed like a superpower.<\/p>\n<p class=\"css-at9mc1 evys1bk0\">In <a class=\"css-yywogo\" href=\"https:\/\/royalsocietypublishing.org\/doi\/10.1098\/rspb.2025.0233\" title=\"\" rel=\"noopener noreferrer\" target=\"_blank\">a study<\/a> published on Wednesday in Proceedings of the Royal Society B, Dr. Matsumoto-Oda and her colleagues compared the healing rates of humans, chimpanzees, monkeys and mice. They found that human wounds took more than twice as long to heal as wounds of any of the other mammals. Our slow healing may be a result of an evolutionary trade-off we made long ago, when we shed fur in favor of naked, sweaty skin that keeps us cool.<\/p>\n<\/div>\n<aside class=\"css-ew4tgv\" aria-label=\"companion column\"\/><\/div>\n<div data-testid=\"companionColumn-1\">\n<div class=\"css-53u6y8\">\n<p class=\"css-at9mc1 evys1bk0\">When possible, the researchers wanted to study healing in a way that was less violent and more controlled than watching wild baboons.<\/p>\n<p class=\"css-at9mc1 evys1bk0\">To measure human healing, they recruited 24 patients who were having skin tumors removed at the University of the Ryukyus Hospital. To gather data on chimpanzees, which are some of our closest animal relatives, researchers observed five captive chimps at the Kumamoto Sanctuary of the Kyoto University Wildlife Research Center, which houses animals formerly used in pharmaceutical research. The chimps\u2019 wounds, like those of wild baboons, mostly came from tiffs between the animals.<\/p>\n<p class=\"css-at9mc1 evys1bk0\">The study\u2019s other primate subjects, all kept at the Kenya Institute of Primate Research, included olive baboons, Sykes\u2019 monkeys and vervet monkeys. Researchers anesthetized the monkeys, surgically wounded them and then monitored their recovery. \u201cAs a field researcher, I personally believe that invasive studies should be minimized as much as possible,\u201d said Dr. Matsumoto-Oda, who noted that bite wounds on wild baboons are often similar in size to the surgical wounds in the study, but deeper.<\/p>\n<p class=\"css-at9mc1 evys1bk0\">Finally, to compare humans and primates with more distantly related mammals, researchers anesthetized and surgically wounded mice and rats.<\/p>\n<p class=\"css-at9mc1 evys1bk0\">Based on her field observations, Dr. Matsumoto-Oda was prepared to see humans healing more slowly than the other animals. The 24 people regrew skin at about a quarter of a millimeter per day, on average.<\/p>\n<\/div>\n<aside class=\"css-ew4tgv\" aria-label=\"companion column\"\/><\/div>\n<div data-testid=\"companionColumn-2\">\n<div class=\"css-53u6y8\">\n<p class=\"css-at9mc1 evys1bk0\">What surprised Dr. Matsumoto-Oda more was the consistency between the healing rates of the animal subjects, including chimpanzees. There was no significant difference in the speedy skin regrowth among different primates, which grew about 0.62 millimeters of new skin per day, or between primates and rodents. Humans were the clear outliers.<\/p>\n<p class=\"css-at9mc1 evys1bk0\">Elaine Fuchs, a stem cell biologist at the Rockefeller University who studies skin growth and repair and was not involved in the new research, said the results were what she would have expected. That\u2019s because skin healing depends on hair.<\/p>\n<p class=\"css-at9mc1 evys1bk0\">Each hair grows from a hair follicle, which also houses stem cells. Normally, those stem cells just make more hair. But when called upon, they can grow new skin instead. \u201cWhen the epidermis is wounded, as in most kinds of scratches and scrapes, it\u2019s really the hair-follicle stem cells that do the repair,\u201d Dr. Fuchs said.<\/p>\n<p class=\"css-at9mc1 evys1bk0\">Furry animals are covered in follicles, which help quickly close up wounds in mice or monkeys. By comparison, \u201chuman skin has very puny hair follicles,\u201d Dr. Fuchs said. And our ancestors lost many of those follicles, packing their skin with sweat glands instead. Sweat glands also have stem cells, but they\u2019re much less efficient at repairing wounds, Dr. Fuchs said.<\/p>\n<p class=\"css-at9mc1 evys1bk0\">Why did we make that trade during evolution, giving up so much of our hair and its protective properties? The glands that make the watery, salty sweat that dampens our shirts on a hot day are called eccrine glands. Most furry mammals have them only in certain places, mainly the soles of their paws. But human ancestors went all-in on sweat \u2014 modern humans have millions of sweat glands all over our bodies, and they\u2019re about <a class=\"css-yywogo\" href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0047248418301519?via%3Dihub\" title=\"\" rel=\"noopener noreferrer\" target=\"_blank\">10 times denser<\/a> than those of chimpanzees.<\/p>\n<\/div>\n<aside class=\"css-ew4tgv\" aria-label=\"companion column\"\/><\/div>\n<div data-testid=\"companionColumn-3\">\n<div class=\"css-53u6y8\">\n<p class=\"css-at9mc1 evys1bk0\">\u201cWe evolved to cool by sweating profusely,\u201d said Daniel Lieberman, an evolutionary biologist at Harvard University. Our abundant sweat glands and lack of fur let our ancestors engage in physical activity in hot environments, Dr. Lieberman said, and cooled the machinery of our big brains.<\/p>\n<p class=\"css-at9mc1 evys1bk0\">The benefits of trading hair for sweat must have outweighed the costs. Dr. Matsumoto-Oda and her co-authors speculate that social support among prehistoric humans might have helped wounded people stay alive, despite our slower healing. (Or maybe they had ways to treat wounds, like <a class=\"css-yywogo\" href=\"https:\/\/www.nytimes.com\/2024\/05\/02\/science\/orangutan-wound-plant-treatment.html\" title=\"\">orangutans<\/a> and <a class=\"css-yywogo\" href=\"https:\/\/www.nytimes.com\/2022\/02\/07\/science\/chimpanzees-insects-medicine-wounds.html\" title=\"\">chimps<\/a> seem to.)<\/p>\n<p class=\"css-at9mc1 evys1bk0\">\u201cThe evolutionary disadvantage is that wound healing is slowed,\u201d Dr. Fuchs said, but humans also gained evolutionary advantages by losing hair.<\/p>\n<p class=\"css-at9mc1 evys1bk0\">\u201cThey can put on a coat if they need to,\u201d she added.<\/p>\n<\/div>\n<aside class=\"css-ew4tgv\" aria-label=\"companion column\"\/><\/div>\n<p><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6606220950177433\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<!-- ItShrt World News -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n  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Japan,<\/p>\n","protected":false},"author":1,"featured_media":22146,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[38],"tags":[1062,220,6599,268,1851,6600,188],"class_list":["post-22145","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science","tag-biology-and-biochemistry","tag-monkeys-and-apes","tag-proceedings-of-the-royal-society-b-journal","tag-research","tag-skin","tag-sweating","tag-your-feed-science"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Humans\u2019 Wounds Heal Much More Slowly Than Other Mammals\u2019 - World News<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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