{"id":91572,"date":"2024-06-12T23:56:57","date_gmt":"2024-06-12T23:56:57","guid":{"rendered":"https:\/\/www.africa-press.net\/congo-kinshasa\/politique\/voyages-dans-lespace-comment-le-systeme-immunitaire-se-deteriore"},"modified":"2024-06-12T23:58:49","modified_gmt":"2024-06-12T23:58:49","slug":"voyages-dans-lespace-comment-le-systeme-immunitaire-se-deteriore","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/congo-kinshasa\/toutes-les-actualites\/voyages-dans-lespace-comment-le-systeme-immunitaire-se-deteriore","title":{"rendered":"Voyages dans l&rsquo;espace : comment le syst\u00e8me immunitaire se d\u00e9t\u00e9riore"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Congo Kinshasa. <\/strong><\/span>Une e\u0301tude mene\u0301e par le Buck Institute, situe\u0301 a\u0300 Novato (Etats-Unis), et publie\u0301e le 11 juin 2024 dans la revue Nature Communications re\u0301ve\u0300le pour la premie\u0300re fois comment le manque de gravite\u0301 affecte les cellules du syste\u0300me immunitaire a\u0300 l\u2019e\u0301chelle de la cellule.<\/p>\n<p>Lors de vols spatiaux, les astronautes ont tendance, me\u0302me lors de voyages de courte dure\u0301e, a\u0300 souffrir d\u2019infections, de sensibilite\u0301 cutane\u0301e ou de la re\u0301activation de virus latents tels que celui de l&rsquo;herpe\u0300s (HSV1).<\/p>\n<p><b>La microgravite\u0301: des effets comparables au vieillissement sur Terre<\/b><\/p>\n<p>Cette e\u0301tude offre une enque\u0302te approfondie sur la fac\u0327on dont la gravite\u0301 affecte les cellules immunitaires, mais aussi sur l\u2019identification d\u2019un compose\u0301 permettant d\u2019atte\u0301nuer les dommages cause\u0301s par les vols spatiaux et lors du vieillissement normal au sol. On note effectivement une grande similitude entre les changements observe\u0301s au cours du vieillissement sur Terre et ceux subis lors des voyages dans l\u2019espace.<\/p>\n<p>Les chercheurs du Buck Institute ont utilise\u0301 un vaisseau a\u0300 paroi rotative de\u0301veloppe\u0301 par la Nasa pour simuler les effets de 25 heures de microgravite\u0301 sur les cellules. Celles-ci sont extraites d\u2019e\u0301chantillons provenant de 27 donneurs humains en bonne sante\u0301 a\u0302ge\u0301s de 20 a\u0300 46 ans. Des donne\u0301es de vols spatiaux tels que la mission Inspiration4 de SpaceX sont e\u0301galement re\u0301colte\u0301es.<\/p>\n<p>Le Dr Sian Proctor posant devant le Crew Dragon suite a\u0300 la mission Inspiration4, premie\u0300re mission entie\u0300rement civile dans l&rsquo;espace, le 18 septembre 2021. Cre\u0301dits:<b> <\/b>SpaceX\/UPI\/Shutterstock\/SIPA<\/p>\n<p>La mission spatiale habite\u0301e du vaisseau Crew Dragon, Inspiration4, a e\u0301te\u0301 lance\u0301e le 15 septembre 2021 et est revenue trois jours plus tard. Bien qu\u2019ils n\u2019aient e\u0301te\u0301 en orbite terrestre basse que pendant quelques jours, les quatre membres de l\u2019e\u0301quipage e\u0301taient vulne\u0301rables a\u0300 des dangers similaires a\u0300 ceux rencontre\u0301s a\u0300 bord de la Station spatiale internationale. \u00ab\u00a0Inspiration4 a e\u0301te\u0301 la premie\u0300re opportunite\u0301 d&#8217;employer des me\u0301thodes de recherche biome\u0301dicale sur un vol spatial entie\u0300rement pilote\u0301 par des astronautes prive\u0301s\u00a0\u00bb, a de\u0301clare\u0301<b> <\/b>dans un communique\u0301 publie\u0301 le 11 juin 2024 le Dr Emmanuel Urquieta, me\u0301decin-chef de TRISH (Translational Research Institute for Space Health) et professeur adjoint au Baylor&rsquo;s Center for Space Medicine (CSM), tous deux situe\u0301s a\u0300 Houston (Etats-Unis).<\/p>\n<p>Ces pre\u0301ce\u0301dentes e\u0301tudes impliquant des astronautes de la Station Spatiale Internationale (ISS) permettent aux chercheurs de cre\u0301er une image comple\u0300te de la fac\u0327on dont les diffe\u0301rentes cellules du syste\u0300me immunitaire &#8211; monocytes et lymphocytes (lire l&rsquo;encadre\u0301 ci-dessous) &#8211; sont fac\u0327onne\u0301es par la microgravite\u0301.<\/p>\n<p>Le <b>monocyte<\/b> est un type de globule blanc qui participe a\u0300 l&rsquo;immunite\u0301 inne\u0301e en phagocytant les pathoge\u0300nes et les de\u0301bris cellulaires. Il peut se transformer en d&rsquo;autres types de cellules comme les macrophages ou les cellules dendritiques pour renforcer la re\u0301ponse immunitaire. Quant aux<b> lymphocytes<\/b>, ils participent a\u0300 la re\u0301ponse immunitaire adaptative sous la forme de cellules B et T. Ces cellules reconnaissent des antige\u0300nes spe\u0301cifiques contre lesquels ils cre\u0301ent des anticorps pour neutraliser le pathoge\u0300ne, formant ainsi une me\u0301moire immunitaire pour une re\u0301ponse plus rapide lors de futures infections.<\/p>\n<p>\u00ab\u00a0Il s\u2019agit de la premie\u0300re e\u0301tude approfondie qui fournit a\u0300 la communaute\u0301 scientifique mondiale un atlas permettant de comprendre la biologie humaine dans ces conditions extre\u0302mes\u00a0\u00bb, explique David Furman, l&rsquo;un des re\u0301dacteurs de l&rsquo;e\u0301tude.<\/p>\n<p><b>La querce\u0301tine, reme\u0300de a\u0300 la microgravite\u0301 ?<\/b><\/p>\n<p>Et s\u2019il existait une contre-mesure aux effets provoque\u0301s par la gravite\u0301 re\u0301duite ? L\u2019e\u0301quipe de recherche s\u2019est axe\u0301e sur la que\u0302te de me\u0301dicaments ou de supple\u0301ments spe\u0301cifiques susceptibles de prote\u0301ger les cellules immunitaires.<\/p>\n<p>Via une technologie d\u2019apprentissage automatique de de\u0301tection d\u2019interactions entre les ge\u0300nes et les aliments et me\u0301dicaments (capable de de\u0301tecter plus de 2 millions d\u2019interactions !), les chercheurs ont se\u0301lectionne\u0301 le compose\u0301 ultime: la querce\u0301tine. C\u2019est un compose\u0301 ve\u0301ge\u0301tal qu\u2019on a l\u2019habitude de retrouver dans les oignons rouges, les myrtilles et me\u0302me le chocolat noir.<\/p>\n<p>La querce\u0301tine serait capable d\u2019inverser pre\u0300s de 70 % des changements cause\u0301s par le manque de gravite\u0301, c&rsquo;est-a\u0300-dire de restaurer l&rsquo;expression ge\u0301nique de notre syste\u0300me immunitaire a\u0300 son e\u0301tat initial. Les recherches produites par cette e\u0301tude n&rsquo;offrent pas de solution miracle mais sugge\u0300rent de multiples modes d&rsquo;activite\u0301 be\u0301ne\u0301fiques de la querce\u0301tine pour la modulation immunitaire en microgravite\u0301 qui demandent a\u0300 e\u0302tre explore\u0301s.<\/p>\n<p>La perspective d\u2019inverser le dysfonctionnement immunitaire provoque\u0301 par le vieillissement semble pour autant gagner du terrain.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">Congo Kinshasa<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Congo Kinshasa. Une e\u0301tude mene\u0301e par le Buck Institute, situe\u0301 a\u0300 Novato (Etats-Unis), et publie\u0301e le 11 juin 2024 dans la revue Nature Communications re\u0301ve\u0300le pour la premie\u0300re fois comment le manque de gravite\u0301 affecte les cellules du syste\u0300me immunitaire a\u0300 l\u2019e\u0301chelle de la cellule. Lors de vols spatiaux, les astronautes ont tendance, [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":91571,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[46],"class_list":["post-91572","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-congo-kinshasa"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Voyages dans l&#039;espace : comment le syst\u00e8me immunitaire se d\u00e9t\u00e9riore - Congo-kinshasa<\/title>\n<meta name=\"description\" content=\"Une e\u0301tude mene\u0301e par le Buck Institute, situe\u0301 a\u0300 Novato (Etats-Unis), et publie\u0301e le 11 juin 2024 dans la revue Nature ...\" \/>\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\/congo-kinshasa\/toutes-les-actualites\/voyages-dans-lespace-comment-le-systeme-immunitaire-se-deteriore\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Voyages dans l&#039;espace : comment le syst\u00e8me immunitaire se d\u00e9t\u00e9riore\" \/>\n<meta property=\"og:description\" content=\"Une e\u0301tude mene\u0301e par le Buck Institute, situe\u0301 a\u0300 Novato (Etats-Unis), et publie\u0301e le 11 juin 2024 dans la revue Nature ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/congo-kinshasa\/toutes-les-actualites\/voyages-dans-lespace-comment-le-systeme-immunitaire-se-deteriore\" \/>\n<meta property=\"og:site_name\" content=\"Congo-kinshasa\" \/>\n<meta property=\"article:published_time\" content=\"2024-06-12T23:56:57+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-06-12T23:58:49+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/congo-kinshasa\/sites\/49\/2024\/06\/sm_1718224076.398821.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=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/congo-kinshasa\/toutes-les-actualites\/voyages-dans-lespace-comment-le-systeme-immunitaire-se-deteriore#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/congo-kinshasa\/toutes-les-actualites\/voyages-dans-lespace-comment-le-systeme-immunitaire-se-deteriore\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/congo-kinshasa\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Voyages dans l&rsquo;espace : comment le syst\u00e8me immunitaire se d\u00e9t\u00e9riore\",\"datePublished\":\"2024-06-12T23:56:57+00:00\",\"dateModified\":\"2024-06-12T23:58:49+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/congo-kinshasa\/toutes-les-actualites\/voyages-dans-lespace-comment-le-systeme-immunitaire-se-deteriore\"},\"wordCount\":848,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/congo-kinshasa\/toutes-les-actualites\/voyages-dans-lespace-comment-le-systeme-immunitaire-se-deteriore#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/congo-kinshasa\/sites\/49\/2024\/06\/sm_1718224076.398821.jpg\",\"keywords\":[\"Congo Kinshasa\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/congo-kinshasa\/toutes-les-actualites\/voyages-dans-lespace-comment-le-systeme-immunitaire-se-deteriore#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/congo-kinshasa\/toutes-les-actualites\/voyages-dans-lespace-comment-le-systeme-immunitaire-se-deteriore\",\"url\":\"https:\/\/www.africa-press.net\/congo-kinshasa\/toutes-les-actualites\/voyages-dans-lespace-comment-le-systeme-immunitaire-se-deteriore\",\"name\":\"Voyages dans l'espace : comment le syst\u00e8me immunitaire se d\u00e9t\u00e9riore - 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