{"id":494,"date":"2022-05-26T20:05:46","date_gmt":"2022-05-26T18:05:46","guid":{"rendered":"http:\/\/afiyafrica.com\/?p=494"},"modified":"2022-05-26T20:05:46","modified_gmt":"2022-05-26T18:05:46","slug":"microplastiques-une-contamination-alimentaire-qui-nuirait-au-fonctionnement-de-notre-intestin","status":"publish","type":"post","link":"https:\/\/afiyafrica.com\/index.php\/focus\/microplastiques-une-contamination-alimentaire-qui-nuirait-au-fonctionnement-de-notre-intestin\/","title":{"rendered":"Microplastiques\u00a0: une contamination alimentaire qui nuirait au fonctionnement de notre intestin"},"content":{"rendered":"<div class='booster-block booster-read-block'>\n                <div class=\"twp-read-time\">\n                \t<i class=\"booster-icon twp-clock\"><\/i> <span>Read Time:<\/span>3 Minute, 45 Second                <\/div>\n\n            <\/div>\n<p><strong>Chez la souris, les microparticules de poly\u00e9thyl\u00e8ne (PE) induisent des troubles de la structure et de la fonction de l\u2019intestin, ainsi que de la flore intestinale. S\u2019il s\u2019av\u00e8re que ces polluants ont un effet comparable chez l\u2019Homme, ils pourraient \u00eatre impliqu\u00e9s dans l\u2019apparition de certaines maladies, notamment canc\u00e9reuses ou inflammatoires.<\/strong><\/p>\n\n\n\n<p>Les microparticules de poly\u00e9thyl\u00e8ne (PE) pr\u00e9sentes dans notre alimentation pourraient avoir une&nbsp;incidence&nbsp;sur le bon fonctionnement de notre intestin. C\u2019est en tout cas une hypoth\u00e8se solide au regard des travaux conduits par Mathilde Body-Malapel* et son \u00e9quipe, dans un mod\u00e8le de souris. Apr\u00e8s six semaines d\u2019une alimentation contamin\u00e9e par des microparticules de PE, la structure et les fonctions immunitaires de la paroi intestinale de ces animaux sont perturb\u00e9es, et la composition de leur microbiote intestinal devient anormale.<\/p>\n\n\n\n<p>Les plastiques sont partout dans notre environnement. En se d\u00e9gradant en particules microscopiques, ils contaminent les sols et les eaux, puis nos aliments et eaux de boisson. Le poly\u00e9thyl\u00e8ne est l\u2019un des plus fr\u00e9quemment utilis\u00e9s, notamment dans les emballages, les sacs plastiques, ou les b\u00e2ches agricoles. La litt\u00e9rature rapporte que des microparticules de PE sont retrouv\u00e9es dans nos selles, notre sang ou encore dans le placenta. \u00ab&nbsp;<em>Malgr\u00e9 leur abondance, ces microparticules ont \u00e9t\u00e9 peu \u00e9tudi\u00e9es, et leur impact sur les intestins n\u2019est pas connu&nbsp;<\/em>\u00bb, rapporte Mathilde Body-Malapel. D\u2019o\u00f9 la mise en place de cette \u00e9tude men\u00e9e chez la souris. \u00ab&nbsp;<em>Nous avons choisi d\u2019\u00e9tudier l\u2019impact de deux tailles de particules, qui correspondent plut\u00f4t \u00e0 la fourchette basse de celles habituellement retrouv\u00e9es dans les selles. Ce choix a \u00e9t\u00e9 fait en accord avec la litt\u00e9rature, qui rapporte que l\u2019impact des microparticules est d\u2019autant plus important que leur diam\u00e8tre est faible. Par ailleurs, les quantit\u00e9s administr\u00e9es \u2013 environ 100\u00b5g\/g de nourriture \u2013 sont voisines de celles auxquelles nous sommes expos\u00e9es.&nbsp;<\/em>\u00bb<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Faut-il craindre un effet cocktail&nbsp;?<\/strong><\/h2>\n\n\n\n<p>En premier lieu, ces travaux montrent une prolif\u00e9ration anormalement \u00e9lev\u00e9e des cryptes intestinales, en charge de renouveler les cellules de l\u2019\u00e9pith\u00e9lium (i.e. la paroi de l\u2019intestin). Ils montrent ensuite que la fonction barri\u00e8re de l\u2019\u00e9pith\u00e9lium au niveau du c\u00f4lon est alt\u00e9r\u00e9e&nbsp;; or elle est indispensable \u00e0 l\u2019immunit\u00e9 intestinale. Localement, la surexpression de&nbsp;cytokines&nbsp;favorise en outre le maintien d\u2019une inflammation chronique locale. Enfin, plusieurs esp\u00e8ces bact\u00e9riennes semblent perturb\u00e9es par les microparticules de PE&nbsp;: par exemple, les lactobacilles&nbsp;<em>\u2013<\/em>&nbsp;connus pour prot\u00e9ger la fonction intestinale&nbsp;<em>\u2013<\/em>&nbsp;sont plus rares dans le microbiote des souris expos\u00e9es aux&nbsp;PE.<\/p>\n\n\n\n<p>Si ces anomalies sont retrouv\u00e9es chez l\u2019Homme, ces microplastiques pourront \u00eatre consid\u00e9r\u00e9s comme des polluants \u00e0 risque s\u00e9rieux pour la sant\u00e9 humaine. Une hypoth\u00e8se qu\u2019il reste \u00e9videmment \u00e0 v\u00e9rifier. \u00ab&nbsp;<em>Ces diff\u00e9rentes observations sont autant d\u2019\u00e9l\u00e9ments qui laissent penser que ces microparticules pourraient influencer le risque de certaines maladies canc\u00e9reuses, inflammatoires ou immunitaires&nbsp;\u00bb<\/em>, explique la chercheuse. Aussi, elle planifie d\u2019ores et d\u00e9j\u00e0 plusieurs nouveaux axes de travail avec son \u00e9quipe&nbsp;: le premier vise \u00e0 \u00e9tudier l\u2019impact des polluants plastiques retrouv\u00e9s dans notre alimentation en se rapprochant des conditions de vie r\u00e9elle. Pour cela, les scientifiques vont \u00e9tudier diff\u00e9rentes formes de particules, celles non sph\u00e9riques semblant plus abrasives pour nos tissus, ainsi que des m\u00e9langes de diff\u00e9rents plastiques qui contiennent des additifs parmi les plus souvent utilis\u00e9s dans ceux \u00e0 usage alimentaire. \u00ab<em>&nbsp;Comme pour les autres polluants chimiques, on suppose qu\u2019il existe un effet cocktail \u2013 ou synergique \u2013 lorsque la composition des microparticules est diverse, \u00e0 l\u2019image de nos expositions quotidiennes&nbsp;\u00bb<\/em>, pr\u00e9cise Mathilde Body-Malapel.<\/p>\n\n\n\n<p>Enfin, la chercheuse souhaite savoir si des souris atteintes de maladie inflammatoire chronique des intestins (MICI) voient leur pathologie aggrav\u00e9e par ces microparticules, et si celles-ci ont un impact comparablesur des \u00e9chantillons d\u2019\u00e9pith\u00e9lium humain, sain ou atteint de MICI, cultiv\u00e9s&nbsp;<em>in vitro<\/em>. \u00ab<em>&nbsp;Ces r\u00e9sultats seront autant d\u2019\u00e9l\u00e9ments pour statuer sur une potentielle causalit\u00e9 entre l\u2019exposition aux microplastiques et ces maladies intestinales.&nbsp;<\/em>\u00bb<\/p>\n\n\n\n<p><strong>Note&nbsp;<\/strong>:<br>* unit\u00e9 1286 Inserm\/Universit\u00e9 de Lille\/CHU de Lille, Institut de&nbsp;recherche translationnelle&nbsp;sur l\u2019inflammation (Infinite), \u00e9quipe Effets des polluants atmosph\u00e9riques et alimentaires sur l\u2019inflammation et la dysbiose intestinale.<\/p>\n\n\n\n<p><strong>Source\u00a0<\/strong>: M. Djouina et coll. Oral exposure to polyethylene microplastics alters gut morphology, immune response, and microbiota composition in mice.\u00a0<em>Environ Res<\/em>\u00a0, \u00e9dition en ligne du 6 avril 2022. DOI\u00a0:\u00a010.1016\/j.envres.2022.113230<\/p>\n\n\n\n<p>source : inserm.fr<\/p>\n        <div class=\"booster-block booster-reactions-block\">\n            <div class=\"twp-reactions-icons\">\n                \n                <div class=\"twp-reacts-wrap\">\n                    <a react-data=\"be-react-1\" post-id=\"494\" class=\"be-face-icons un-reacted\" href=\"javascript:void(0)\">\n                        <img decoding=\"async\" src=\"https:\/\/afiyafrica.com\/wp-content\/plugins\/booster-extension\/\/assets\/icon\/happy.svg\" alt=\"Happy\">\n                    <\/a>\n                    <div class=\"twp-reaction-title\">\n                        Happy                    <\/div>\n                    <div class=\"twp-count-percent\">\n                                                    <span style=\"display: none;\" class=\"twp-react-count\">0<\/span>\n                        \n                                                <span class=\"twp-react-percent\"><span>0<\/span> 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et&#8230;<\/p>\n","protected":false},"author":1,"featured_media":495,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[22],"tags":[31,46,45,30],"class_list":["post-494","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-focus","tag-afrique","tag-contamination-alimentaire","tag-microplastiques","tag-sante"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Microplastiques\u00a0: une contamination alimentaire qui nuirait au fonctionnement de notre intestin -<\/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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