{"id":29600,"date":"2026-03-17T14:32:00","date_gmt":"2026-03-17T14:32:00","guid":{"rendered":"https:\/\/www.africa-press.net\/burundi\/politique\/spermatozoides-difficiles-a-orienter-dans-lespace"},"modified":"2026-04-19T18:33:40","modified_gmt":"2026-04-19T18:33:40","slug":"spermatozoides-difficiles-a-orienter-dans-lespace","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/burundi\/toutes-les-actualites\/spermatozoides-difficiles-a-orienter-dans-lespace","title":{"rendered":"Spermatozo\u00efdes Difficiles \u00e0 Orienter Dans l\u2019Espace"},"content":{"rendered":"<p><span class=\"ap-article-header-tag\"> <strong>Africa-Press &#8211; Burundi. <\/strong> <\/span>Dans l\u2019espace, les spermatozoi\u0308des ont du mal a\u0300 trouver leur chemin vers l\u2019ovule en raison de la microgravite\u0301, qui perturbe aussi le de\u0301veloppement des embryons, selon une e\u0301tude publie\u0301e le 26 mars 2026 dans Communications Biology.<\/p>\n<p>Alors que la Nasa ambitionne de construire une base lunaire dans les prochaines anne\u0301es et d\u2019envoyer a\u0300 terme des missions habite\u0301es vers Mars, les scientifiques e\u0301tudient a\u0300 quel point il pourrait e\u0302tre difficile de se reproduire a\u0300 bord des vaisseaux spatiaux ou sur d\u2019autres plane\u0300tes.<\/p>\n<p>Une des difficulte\u0301s re\u0301side dans le fait que le sperme n\u2019est plus attire\u0301 vers le bas par la gravite\u0301 terrestre. \u00ab Les spermatozoi\u0308des doivent activement trouver leur chemin vers l\u2019ovule et cette e\u0301tude est la premie\u0300re a\u0300 tester leur capacite\u0301 a\u0300 le faire dans des conditions semblables a\u0300 ce qui se passe dans l\u2019espace \u00bb, explique a\u0300 l\u2019AFP Nicole McPherson, autrice principale de l\u2019e\u0301tude et chercheuse a\u0300 l\u2019Universite\u0301 d\u2019Adelai\u0308de (Australie).<\/p>\n<p>Son e\u0301quipe a utilise\u0301 une chambre en plastique imitant l\u2019appareil ge\u0301nital fe\u0301minin, qui leur a servi de \u00ab parcours d\u2019obstacles miniature \u00bb. \u00ab Voyez c\u0327a comme un minuscule circuit de course&#8230; Les spermatozoi\u0308des e\u0301taient introduits a\u0300 une extre\u0301mite\u0301 et devaient nager jusqu\u2019a\u0300 l\u2019autre bout \u00bb, de\u0301crit-elle.<\/p>\n<p>Elimination des plus faibles<\/p>\n<p>Les chercheurs ont teste\u0301 successivement du sperme de souris et humain dans ce dispositif place\u0301 dans un appareil en constante rotation pour simuler la microgravite\u0301. Les game\u0300tes ont e\u0301te\u0301 environ 50 % moins performants pour naviguer a\u0300 travers ce parcours que sous la gravite\u0301 terrestre. Cela e\u0301quivaut a\u0300 une baisse de 30% du taux de fe\u0301condation re\u0301ussie, selon les re\u0301sultats de l\u2019e\u0301tude.<\/p>\n<p>Les spermatozoi\u0308des ayant re\u0301ussi a\u0300 franchir le parcours semblaient produire des embryons de meilleure qualite\u0301. Il semble que le stress lie\u0301 a\u0300 la microgravite\u0301 ait agi comme un \u00ab filtre \u00bb e\u0301liminant les plus faibles et \u00ab ne laissant en lice que les plus performants \u00bb, ce qui pourrait s\u2019ave\u0301rer \u00ab be\u0301ne\u0301fique \u00bb, selon Mme McPherson.<\/p>\n<p>Cependant, un proble\u0300me plus important est apparu dans les vingt-quatre heures suivant la fe\u0301condation. \u00ab Les re\u0301sultats se sont brutalement inverse\u0301s, avec moins d\u2019embryons forme\u0301s. Et ceux qui restaient e\u0301taient de moins bonne qualite\u0301 \u00bb, note la chercheuse. La microgravite\u0301 \u00ab n\u2019est peut-e\u0302tre pas l\u2019obstacle insurmontable que nous craignions, mais prote\u0301ger les embryons de l\u2019impesanteur au cours de ces premie\u0300res heures critiques sera vraisemblablement essentiel pour la reproduction dans l\u2019espace \u00bb, avance Mme McPherson.<\/p>\n<p>De nombreuses autres recherches seront cependant ne\u0301cessaires pour comprendre comment la reproduction fonctionne dans l\u2019espace, la fe\u0301condation n\u2019e\u0301tant qu\u2019une \u00ab petite pie\u0300ce d\u2019un tre\u0300s grand et complexe puzzle \u00bb, ajoute-t-elle. \u00ab Nous sommes encore tre\u0300s loin de voir un premier be\u0301be\u0301 de l\u2019espace \u00bb !<\/p>\n<p class=\"ap-article-footer-note\">Retrouvez plus d\u2019actualit\u00e9s et d\u2019analyses sur <span class=\"ap-highlight-country\">Burundi<\/span> sur le site <span class=\"ap-highlight-brand\">Africa Press<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Burundi. Dans l\u2019espace, les spermatozoi\u0308des ont du mal a\u0300 trouver leur chemin vers l\u2019ovule en raison de la microgravite\u0301, qui perturbe aussi le de\u0301veloppement des embryons, selon une e\u0301tude publie\u0301e le 26 mars 2026 dans Communications Biology. Alors que la Nasa ambitionne de construire une base lunaire dans les prochaines anne\u0301es et d\u2019envoyer [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":29599,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[45],"class_list":["post-29600","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-burundi"],"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>Spermatozo\u00efdes Difficiles \u00e0 Orienter Dans l\u2019Espace - Burundi<\/title>\n<meta name=\"description\" content=\"-article-header-tag&quot;&gt; Africa-Press - Burundi. Dans l\u2019espace, les spermatozoi\u0308 ...\" \/>\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\/burundi\/toutes-les-actualites\/spermatozoides-difficiles-a-orienter-dans-lespace\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Spermatozo\u00efdes Difficiles \u00e0 Orienter Dans l\u2019Espace\" \/>\n<meta property=\"og:description\" content=\"-article-header-tag&quot;&gt; Africa-Press - Burundi. 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