{"id":44534,"date":"2023-05-18T17:47:37","date_gmt":"2023-05-18T17:47:37","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/comment-les-ours-parviennent-a-hiberner-en-evitant-les-problemes-veineux"},"modified":"2023-05-18T19:13:58","modified_gmt":"2023-05-18T19:13:58","slug":"comment-les-ours-parviennent-a-hiberner-en-evitant-les-problemes-veineux","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/comment-les-ours-parviennent-a-hiberner-en-evitant-les-problemes-veineux","title":{"rendered":"Comment les ours parviennent \u00e0 hiberner en \u00e9vitant les probl\u00e8mes veineux"},"content":{"rendered":"

Africa-Press – Senegal. <\/strong><\/span>Pour passer l\u2019hiver, l\u2019ours brun hiberne plus de quatre mois : immobile, sa tempe\u0301rature baisse de 37\u00b0C a\u0300 33\u00b0C et son pouls ralentit fortement, mais le risque de former des caillots sanguins n\u2019augmente pas. Pour comprendre ce phe\u0301nome\u0300ne, une e\u0301quipe germano-sue\u0301doise de chercheurs a compare\u0301, dans la revue Science, les prote\u0301ines du sang pre\u0301leve\u0301 chez des animaux en hibernation, puis lorsqu\u2019ils e\u0301taient en pleine activite\u0301 l\u2019e\u0301te\u0301 suivant.<\/p>\n

Une prote\u0301ine qui disparait presque du sang en hiver<\/b><\/p>\n

Leur e\u0301tude a montre\u0301 qu\u2019une prote\u0301ine plaquettaire appele\u0301e HSP47 pre\u0301sentait la plus grosse diffe\u0301rence de concentration et disparaissait presque du sang en hiver. Cette prote\u0301ine, qui n\u2019est pas un facteur de coagulation, favorise l\u2019activation par les plaquettes des neutrophiles, des cellules du sang qui jouent un ro\u0302le majeur dans la formation des caillots sanguins. Ce me\u0301canisme se produit aussi chez l\u2019e\u0302tre humain.<\/p>\n

Pour s\u2019en assurer, les chercheurs dirige\u0301s par Tobias Petzold de l\u2019Ho\u0302pital universitaire de Munich en Allemagne se sont tourne\u0301s vers des volontaires qui devaient rester allonge\u0301s un mois dans le cadre d\u2019une expe\u0301rience de simulation de vol spatial de la Nasa et du Centre ae\u0301rospatial allemand : au bout d\u2019une semaine, la concentration HSP47 a aussi commence\u0301 a\u0300 baisser dans leur sang.<\/p>\n

Une nouvelle piste pour pre\u0301venir la formation de caillots sanguins ?<\/b><\/p>\n

Des taux plus bas que la moyenne ont aussi e\u0301te\u0301 retrouve\u0301s dans le sang de personnes te\u0301tra ou he\u0301miple\u0301giques, ainsi que chez des truies immobilise\u0301es apre\u0300s leur mise bas. Les risques de coagulation sont re\u0301duits par la baisse de re\u0301activite\u0301 des plaquettes, une strate\u0301gie plus souple que celle des rongeurs hibernants tels que marmottes et e\u0301cureuils ou\u0300 les plaquettes sont stocke\u0301es dans le foie.<\/p>\n

La formation de caillots sanguins est a\u0300 l\u2019origine de thromboses veineuses qui peuvent provoquer des phle\u0301bites et, beaucoup plus grave, des embolies pulmonaires. Elle est plus fre\u0301quente en cas d\u2019immobilisation temporaire a\u0300 la suite d\u2019un accident, mais aussi chez les femmes enceintes, les diabe\u0301tiques ou les personnes atteintes d\u2019un cancer. Plusieurs types de me\u0301dicaments visent a\u0300 limiter les risques de coagulation ou a\u0300 fluidifier le sang, mais cette e\u0301tude chez l\u2019ours a peut-e\u0302tre ouvert une nouvelle piste pour pre\u0301venir la formation de caillots sanguins chez certains patients… ou futurs spationautes.<\/p>\n

Pour plus d’informations et d’analyses sur la Senegal<\/a>, suivez Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – Senegal. Pour passer l\u2019hiver, l\u2019ours brun hiberne plus de quatre mois : immobile, sa tempe\u0301rature baisse de 37\u00b0C a\u0300 33\u00b0C et son pouls ralentit fortement, mais le risque de former des caillots sanguins n\u2019augmente pas. Pour comprendre ce phe\u0301nome\u0300ne, une e\u0301quipe germano-sue\u0301doise de chercheurs a compare\u0301, dans la revue Science, les prote\u0301ines du […]<\/p>\n","protected":false},"author":82,"featured_media":44533,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[43,47,44],"class_list":["post-44534","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press-2","tag-africa-press-senegal","tag-senegal-2"],"yoast_head":"\nComment les ours parviennent \u00e0 hiberner en \u00e9vitant les probl\u00e8mes veineux - Senegal<\/title>\n<meta name=\"description\" content=\"Pour passer l\u2019hiver, l\u2019ours brun hiberne plus de quatre mois : immobile, sa tempe\u0301rature baisse de 37\u00b0C a\u0300 33\u00b0C et son p ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/comment-les-ours-parviennent-a-hiberner-en-evitant-les-problemes-veineux\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Comment les ours parviennent \u00e0 hiberner en \u00e9vitant les probl\u00e8mes veineux\" \/>\n<meta property=\"og:description\" content=\"Pour passer l\u2019hiver, l\u2019ours brun hiberne plus de quatre mois : immobile, sa tempe\u0301rature baisse de 37\u00b0C a\u0300 33\u00b0C et son p ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/comment-les-ours-parviennent-a-hiberner-en-evitant-les-problemes-veineux\" \/>\n<meta property=\"og:site_name\" content=\"Senegal\" \/>\n<meta property=\"article:published_time\" content=\"2023-05-18T17:47:37+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-05-18T19:13:58+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2023\/05\/postQueueImg_1684415871.97.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"899\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/comment-les-ours-parviennent-a-hiberner-en-evitant-les-problemes-veineux#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/comment-les-ours-parviennent-a-hiberner-en-evitant-les-problemes-veineux\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Comment les ours parviennent \u00e0 hiberner en \u00e9vitant les probl\u00e8mes veineux\",\"datePublished\":\"2023-05-18T17:47:37+00:00\",\"dateModified\":\"2023-05-18T19:13:58+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/comment-les-ours-parviennent-a-hiberner-en-evitant-les-problemes-veineux\"},\"wordCount\":451,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/comment-les-ours-parviennent-a-hiberner-en-evitant-les-problemes-veineux#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2023\/05\/postQueueImg_1684415871.97.jpg\",\"keywords\":[\"Africa Press\",\"Africa Press-Senegal\",\"Senegal\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/comment-les-ours-parviennent-a-hiberner-en-evitant-les-problemes-veineux#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/comment-les-ours-parviennent-a-hiberner-en-evitant-les-problemes-veineux\",\"url\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/comment-les-ours-parviennent-a-hiberner-en-evitant-les-problemes-veineux\",\"name\":\"Comment les ours parviennent \u00e0 hiberner en \u00e9vitant les probl\u00e8mes veineux - 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