{"id":7865,"date":"2025-07-10T06:55:44","date_gmt":"2025-07-10T04:55:44","guid":{"rendered":"https:\/\/rvh-synergie.org\/actualites\/les-substances-isolees-des-eponges-marines-presentent-un-potentiel-de-traitement-du-paludisme\/"},"modified":"2025-07-10T06:55:46","modified_gmt":"2025-07-10T04:55:46","slug":"les-substances-isolees-des-eponges-marines-presentent-un-potentiel-de-traitement-du-paludisme","status":"publish","type":"post","link":"https:\/\/rvh-synergie.org\/actualites\/les-substances-isolees-des-eponges-marines-presentent-un-potentiel-de-traitement-du-paludisme\/","title":{"rendered":"Les substances isol\u00e9es des \u00e9ponges marines pr\u00e9sentent un potentiel de traitement du paludisme"},"content":{"rendered":"<div>\n<div class=\"article-gallery lightGallery\">\n<div data-thumb=\"https:\/\/scx1.b-cdn.net\/csz\/news\/tmb\/2025\/substances-isolated-fr.jpg\" data-src=\"https:\/\/scx2.b-cdn.net\/gfx\/news\/2025\/substances-isolated-fr.jpg\" data-sub-html=\"Compounds were isolated from the species Monanchora arbuscula. Credit: Eduardo Hadju\">\n<figure class=\"article-img\">\n<\/figure><\/div>\n<\/div>\n<p>Des chercheurs br\u00e9siliens ont d\u00e9couvert des compos\u00e9s chimiques dans les \u00e9ponges marines qui ont le potentiel d&rsquo;\u00e9liminer le parasite du paludisme, y compris des souches r\u00e9sistantes aux m\u00e9dicaments antipaludiques conventionnels. Les r\u00e9sultats de la recherche ont \u00e9t\u00e9 publi\u00e9s dans la revue <i>ACS Maladies infectieuses<\/i>.<\/p>\n<p>Caus\u00e9es par les protozoaires et transmises par les piq\u00fbres des moustiques d&rsquo;Anopheles, le paludisme est l&rsquo;une des maladies infectieuses les plus mortelles au monde. Selon l&rsquo;Organisation mondiale de la sant\u00e9 (OMS), il y a eu environ 600 000 d\u00e9c\u00e8s li\u00e9s au paludisme en 2023 seulement, dont 75% \u00e9taient des enfants de moins de cinq ans.<\/p>\n<p>Il s&rsquo;est av\u00e9r\u00e9 que deux compos\u00e9s nouvellement d\u00e9couverts, Batzelladines F et L, \u00e9liminent rapidement les parasites qui provoquent le paludisme, y compris Plasmodium falciparum, qui est pr\u00e9dominant en Afrique et plus mortel, et Plasmodium vivax, qui est pr\u00e9dominant en Am\u00e9rique du Sud. L&rsquo;efficacit\u00e9 des substances a \u00e9t\u00e9 prouv\u00e9e par des tests sur des \u00e9chantillons de sang des patients et des souris infect\u00e9es.<\/p>\n<p>\u00ab\u00a0Ce sont des r\u00e9sultats solides qui nous donnent de l&rsquo;espoir pour un nouveau traitement. Bien que les compos\u00e9s n&rsquo;aient pas compl\u00e8tement \u00e9limin\u00e9 les protozoaires, ils peuvent servir d&rsquo;inspiration pour la synth\u00e8se de nouvelles structures chimiques avec une action am\u00e9lior\u00e9e\u00a0\u00bb, explique Rafael Guido, professeur \u00e0 l&rsquo;Universit\u00e9 de S\u00e3o Paulo, S\u00e9 Carlos Institute of Physics (IFSC-USP) et co-autoror de l&rsquo;\u00e9tude.<\/p>\n<p>L&rsquo;\u00e9tude a impliqu\u00e9 une \u00e9quipe multidisciplinaire de l&rsquo;USP, du Mus\u00e9e national, de l&rsquo;Universit\u00e9 f\u00e9d\u00e9rale de S\u00e3o Carlos (UFSCAR) et du Roraima Tropical Medicine Research Center.<\/p>\n<p>Roberto Berlinck, professeur au S\u00e3o Carlos Institute of Chemistry (IQSC-USP) qui a \u00e9galement sign\u00e9 le journal, a d\u00e9clar\u00e9 que la constatation souligne l&rsquo;importance de la biodiversit\u00e9 br\u00e9silienne, qui est en danger.<\/p>\n<p>\u00ab\u00a0Nous n&rsquo;associons g\u00e9n\u00e9ralement pas l&rsquo;impact n\u00e9gatif du changement climatique \u00e0 la d\u00e9couverte de nouveaux m\u00e9dicaments ou, plus pr\u00e9cis\u00e9ment, \u00e0 gu\u00e9rir les maladies. Les \u00e9ponges de Monanchora Arbuscula vivent dans un environnement menac\u00e9 par le r\u00e9chauffement de l&rsquo;oc\u00e9an. Par cons\u00e9quent, un produit naturel que nous commen\u00e7ons \u00e0 enqu\u00eater pourrait dispara\u00eetre\u00a0\u00bb, avertit le chercheur.<\/p>\n<p>Berlinck souligne \u00e9galement que le changement climatique a entra\u00een\u00e9 une augmentation des cas de paludisme dans le monde.<\/p>\n<div class=\"article-gallery lightGallery\">\n<div data-thumb=\"https:\/\/scx1.b-cdn.net\/csz\/news\/tmb\/2025\/substances-isolated-fr-1.jpg\" data-src=\"https:\/\/scx2.b-cdn.net\/gfx\/news\/hires\/2025\/substances-isolated-fr-1.jpg\" data-sub-html=\"Speed of action evaluation of batzelladines F and L. Credit: &lt;i&gt;ACS Infectious Diseases&lt;\/i&gt; (2025). DOI: 10.1021\/acsinfecdis.4c00714\">\n<figure class=\"article-img text-center\">\n            <img decoding=\"async\" src=\"https:\/\/rvh-synergie.org\/actualites\/wp-content\/uploads\/2025\/07\/1752123344_26_Les-substances-isolees-des-eponges-marines-presentent-un-potentiel-de.jpg\" alt=\"Les substances isol\u00e9es des \u00e9ponges marines pr\u00e9sentent un potentiel de traitement du paludisme\" title=\"\u00c9valuation de la vitesse d'action des Batzelladines F et L. Cr\u00e9dit: maladies infectieuses ACS (2025). Doi: 10.1021 \/ acsinfecdis.4c00714\"><br \/>\n                     <\/figure>\n<\/p><\/div>\n<\/div>\n<h2>M\u00e9thodologie<\/h2>\n<p>Pour \u00e9tudier les m\u00e9canismes d&rsquo;action des Batzelladines, le groupe de chercheurs les a isol\u00e9s des autres compos\u00e9s trouv\u00e9s dans l&rsquo;\u00e9ponge marine et caract\u00e9ris\u00e9 leur structure chimique. Cette \u0153uvre a \u00e9t\u00e9 r\u00e9alis\u00e9e par Anderson L. Noronha, d&rsquo;IQSC-USP.<\/p>\n<p>Les chercheurs ont not\u00e9 que les Batzelladines agissent rapidement et efficacement sur les jeunes parasites, inhibant leur capacit\u00e9 \u00e0 se multiplier \u00e0 l&rsquo;int\u00e9rieur des globules rouges de l&rsquo;h\u00f4te. Selon Guido, cette action rapide signifie que les parasites sont moins susceptibles de d\u00e9velopper une r\u00e9sistance au traitement.<\/p>\n<p>\u00ab\u00a0Nous avons observ\u00e9 que le parasite meurt d\u00e8s qu&rsquo;il entre en contact avec les compos\u00e9s chimiques. Ceci est important parce que les mol\u00e9cules qui tuent le parasite lui permettent lentement de s&rsquo;adapter et de g\u00e9n\u00e9rer une r\u00e9sistance\u00a0\u00bb, explique Giovana Rossi Mendes, de l&rsquo;IFSC-USP, qui \u00e9tait responsable de la r\u00e9alisation des tests avec les \u00e9chantillons de sang et les souris.<\/p>\n<p>En plus de lutter contre le paludisme, les substances d\u00e9riv\u00e9es d&rsquo;\u00e9ponges marines ont d\u00e9montr\u00e9 une activit\u00e9 anti-parasitique contre d&rsquo;autres maladies, notamment la leishmaniose et la maladie de Chagas.<\/p>\n<p>\u00ab\u00a0\u00c0 premi\u00e8re vue, il peut sembler inhabituel qu&rsquo;une substance avec le potentiel de gu\u00e9rir le paludisme, une maladie li\u00e9e aux for\u00eats tropicales, soit pr\u00e9sente dans un micro-organisme marin, qui n&rsquo;aurait pas besoin de se prot\u00e9ger de cet agent pathog\u00e8ne. Mais la d\u00e9connexion apparente est en fait monnaie courante dans les \u00e9tudes de prospection pour les produits naturels avec une activit\u00e9 biologique\u00a0\u00bb, explique Guido.<\/p>\n<p>Ces substances sont ce que les scientifiques appellent les m\u00e9tabolites secondaires: les compos\u00e9s organiques qui remplissent des fonctions adaptatives pour les organismes qui les produisent ou les accumulent. Ces fonctions incluent la d\u00e9fense contre les ennemis, l&rsquo;attraction entre les sexes, la r\u00e9pulsion des pr\u00e9dateurs et l&rsquo;occupation de l&rsquo;espace physique, entre autres.<\/p>\n<p>\u00ab\u00a0Tout comme les agents qui provoquent le paludisme, les \u00e9ponges marines sont des organismes tr\u00e8s anciens qui ont accumul\u00e9 ces m\u00e9tabolites secondaires au fil des ann\u00e9es d&rsquo;\u00e9volution pour assurer leur succ\u00e8s dans l&rsquo;environnement dans lequel ils se retrouvent, les oc\u00e9ans\u00a0\u00bb, explique Guido.<\/p>\n<p>                                        <!-- print only --><\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Des chercheurs br\u00e9siliens ont d\u00e9couvert des compos\u00e9s chimiques dans les \u00e9ponges marines qui ont le<\/p>\n","protected":false},"author":1,"featured_media":7866,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[16,5967,5966,49,5968,866,572,104,741,261],"class_list":["post-7865","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-maladies","tag-des","tag-eponges","tag-isolees","tag-les","tag-marines","tag-paludisme","tag-potentiel","tag-presentent","tag-substances","tag-traitement","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.4 - 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