{"id":3007,"date":"2024-12-20T22:56:19","date_gmt":"2024-12-20T21:56:19","guid":{"rendered":"https:\/\/rvh-synergie.org\/actualites\/lapproche-optogenetique-revele-comment-les-troubles-lies-a-la-consommation-dalcool-alterent-la-flexibilite-cognitive\/"},"modified":"2024-12-20T22:56:37","modified_gmt":"2024-12-20T21:56:37","slug":"lapproche-optogenetique-revele-comment-les-troubles-lies-a-la-consommation-dalcool-alterent-la-flexibilite-cognitive","status":"publish","type":"post","link":"https:\/\/rvh-synergie.org\/actualites\/lapproche-optogenetique-revele-comment-les-troubles-lies-a-la-consommation-dalcool-alterent-la-flexibilite-cognitive\/","title":{"rendered":"L\u2019approche optog\u00e9n\u00e9tique r\u00e9v\u00e8le comment les troubles li\u00e9s \u00e0 la consommation d\u2019alcool alt\u00e8rent la flexibilit\u00e9 cognitive"},"content":{"rendered":"
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Les troubles li\u00e9s \u00e0 la consommation d’alcool (AUD) touchent environ 400 millions de personnes dans le monde et constituent l’une des principales causes de maladies graves telles que le cancer, les maladies cardiovasculaires, les maladies du foie et les accidents vasculaires c\u00e9r\u00e9braux. Au-del\u00e0 de ces impacts physiques, l\u2019AUD perturbe profond\u00e9ment les fonctions c\u00e9r\u00e9brales essentielles \u00e0 l\u2019apprentissage, \u00e0 la m\u00e9moire et \u00e0 l\u2019adaptabilit\u00e9, \u00e9l\u00e9ments cl\u00e9s de la flexibilit\u00e9 cognitive.<\/p>\n

Aujourd\u2019hui, des chercheurs du Texas A&M University College of Medicine ont jet\u00e9 un nouvel \u00e9clairage sur la fa\u00e7on dont la consommation chronique d\u2019alcool modifie les voies de signalisation c\u00e9r\u00e9brale, en se concentrant sp\u00e9cifiquement sur la fa\u00e7on dont elle alt\u00e8re la flexibilit\u00e9 cognitive. Leurs conclusions, r\u00e9cemment publi\u00e9es dans Avanc\u00e9es scientifiques,<\/i> d\u00e9montrer le r\u00f4le important des interneurones cholinergiques (CIN) dans ce processus.<\/p>\n

Zhenbo Huang, Ph.D., chercheur associ\u00e9 au laboratoire de Jun Wang, MD, Ph.D., et ses coll\u00e8gues ont d\u00e9montr\u00e9 que l’alcool perturbe la capacit\u00e9 du cerveau \u00e0 s’adapter en modifiant les sch\u00e9mas de tir en rafale et en pause des CIN, sp\u00e9cialis\u00e9s neurones qui lib\u00e8rent de l’ac\u00e9tylcholine, un neurotransmetteur cl\u00e9. Les CIN sont des gardiens essentiels du striatum du cerveau, influen\u00e7ant l’apprentissage et la motivation ax\u00e9s sur la r\u00e9compense en modulant la signalisation dopaminergique.<\/p>\n

\u00ab\u00a0Les neurones dopaminergiques pilotent le syst\u00e8me de r\u00e9compense du cerveau, tandis que les CIN agissent comme des gardiens, filtrant les stimuli qui activent ces neurones\u00a0\u00bb, a d\u00e9clar\u00e9 Wang, professeur agr\u00e9g\u00e9 au Texas A&M College of Medicine.<\/p>\n

\u00c0 l\u2019aide d\u2019outils avanc\u00e9s tels que l\u2019optog\u00e9n\u00e9tique, qui utilise la lumi\u00e8re pour contr\u00f4ler les cellules, les chercheurs ont d\u00e9couvert que la stimulation des CIN dans des mod\u00e8les animaux expos\u00e9s \u00e0 l\u2019alcool chronique produisait un sch\u00e9ma de d\u00e9clenchement modifi\u00e9 par rapport aux mod\u00e8les sans exposition chronique \u00e0 l\u2019alcool.<\/p>\n

Normalement, les CIN se d\u00e9clenchent selon un sch\u00e9ma \u00ab\u00a0rafale-pause\u00a0\u00bb\u00a0: une rafale rapide d’activit\u00e9 suivie d’une pause, essentielle pour apprendre de nouveaux comportements et s’adapter au changement. Cependant, dans les mod\u00e8les expos\u00e9s \u00e0 l’alcool, ce sch\u00e9ma de d\u00e9clenchement \u00e9tait consid\u00e9rablement perturb\u00e9, avec des pauses plus courtes et plus faibles, alt\u00e9rant le processus d’apprentissage critique tel que l’inclinaison invers\u00e9e.<\/p>\n

\u00ab\u00a0L’apprentissage invers\u00e9 est la pierre angulaire de la flexibilit\u00e9 cognitive\u00a0\u00bb, a expliqu\u00e9 Wang. \u00ab\u00a0Cela permet aux individus de d\u00e9sapprendre leurs comportements lorsque les r\u00e8gles ou les circonstances changent, un processus fortement d\u00e9pendant de la signalisation de l’ac\u00e9tylcholine.\u00a0\u00bb<\/p>\n

En combinant l’optog\u00e9n\u00e9tique, qui utilise la lumi\u00e8re pour contr\u00f4ler l’activit\u00e9 du CIN, et la photom\u00e9trie des fibres, qui implique des biocapteurs g\u00e9n\u00e9tiquement modifi\u00e9s pour d\u00e9tecter la lib\u00e9ration d’ac\u00e9tylcholine en temps r\u00e9el pendant que les sujets effectuent des t\u00e2ches, l’\u00e9quipe a d\u00e9couvert des r\u00f4les distincts pour les diff\u00e9rentes phases de d\u00e9clenchement du CIN.<\/p>\n

La phase \u00ab\u00a0\u00e9clatante\u00a0\u00bb, qui augmente la lib\u00e9ration d’ac\u00e9tylcholine par les CIN, facilite l’apprentissage par extinction, o\u00f9 les anciens comportements sont d\u00e9sappris. La phase de \u00ab pause \u00bb, en revanche, qui provoque une baisse de la lib\u00e9ration d’ac\u00e9tylcholine par les CIN, est cruciale pour l’apprentissage par inversion, o\u00f9 de nouveaux comportements remplacent les anciens.<\/p>\n

Cette recherche r\u00e9volutionnaire r\u00e9v\u00e8le comment l\u2019alcool mine ces m\u00e9canismes, offrant ainsi de nouvelles perspectives sur les effets plus larges de l\u2019AUD. Surtout, les r\u00e9sultats sugg\u00e8rent des cibles th\u00e9rapeutiques potentielles pour traiter les d\u00e9ficiences cognitives associ\u00e9es \u00e0 l’AUD.<\/p>\n

\u00ab\u00a0La dynamique de rafale et de pause des CIN est essentielle \u00e0 l’adaptabilit\u00e9 comportementale\u00a0\u00bb, a d\u00e9clar\u00e9 Wang. \u00ab\u00a0Cette \u00e9tude met en valeur leurs r\u00f4les uniques et jette les bases pour explorer comment des m\u00e9canismes similaires pourraient influencer des conditions au-del\u00e0 de la d\u00e9pendance, notamment le vieillissement et les maladies neurod\u00e9g\u00e9n\u00e9ratives.\u00a0\u00bb<\/p>\n

L\u2019\u00e9quipe Wang continue d\u2019explorer l\u2019impact de la dynamique des CIN sur la sant\u00e9 c\u00e9r\u00e9brale, dans le but de traduire leurs d\u00e9couvertes en traitements innovants pour divers troubles c\u00e9r\u00e9braux.<\/p>\n

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Les troubles li\u00e9s \u00e0 la consommation d’alcool (AUD) touchent environ 400 millions de personnes dans<\/p>\n","protected":false},"author":1,"featured_media":3008,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[3202,3151,182,33,34,3203,1699,49,172,3201,157,164],"class_list":["post-3007","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-addictions","tag-alterent","tag-cognitive","tag-comment","tag-consommation","tag-dalcool","tag-flexibilite","tag-lapproche","tag-les","tag-lies","tag-optogenetique","tag-revele","tag-troubles","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50","resize-featured-image"],"yoast_head":"\nL\u2019approche optog\u00e9n\u00e9tique r\u00e9v\u00e8le comment les troubles li\u00e9s \u00e0 la consommation d\u2019alcool alt\u00e8rent la flexibilit\u00e9 cognitive - RVH-Synergie.org<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/rvh-synergie.org\/actualites\/lapproche-optogenetique-revele-comment-les-troubles-lies-a-la-consommation-dalcool-alterent-la-flexibilite-cognitive\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"L\u2019approche optog\u00e9n\u00e9tique r\u00e9v\u00e8le comment les troubles li\u00e9s \u00e0 la consommation d\u2019alcool alt\u00e8rent la flexibilit\u00e9 cognitive - 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