{"id":51597,"date":"2020-11-09T10:00:50","date_gmt":"2020-11-09T17:00:50","guid":{"rendered":"https:\/\/askthescientists.com\/?p=51597"},"modified":"2022-07-18T13:53:13","modified_gmt":"2022-07-18T19:53:13","slug":"vitamin-d-immunity","status":"publish","type":"post","link":"https:\/\/askthescientists.com\/fr\/vitamin-d-immunity\/","title":{"rendered":"La vitamine D et l\u2019immunit\u00e9 : les fa\u00e7ons dont la vitamine D contribue \u00e0 la sant\u00e9 immunitaire"},"content":{"rendered":"<p><img decoding=\"async\" class=\"aligncenter size-large wp-image-51568\" src=\"https:\/\/askthescientists.com\/wp-content\/uploads\/2020\/11\/AdobeStock_213632761-1-835x543.jpeg\" alt=\"\" width=\"835\" height=\"543\" srcset=\"https:\/\/askthescientists.com\/wp-content\/uploads\/2020\/11\/AdobeStock_213632761-1-835x543.jpeg 835w, https:\/\/askthescientists.com\/wp-content\/uploads\/2020\/11\/AdobeStock_213632761-1-400x260.jpeg 400w, https:\/\/askthescientists.com\/wp-content\/uploads\/2020\/11\/AdobeStock_213632761-1-768x499.jpeg 768w, https:\/\/askthescientists.com\/wp-content\/uploads\/2020\/11\/AdobeStock_213632761-1-1536x998.jpeg 1536w, https:\/\/askthescientists.com\/wp-content\/uploads\/2020\/11\/AdobeStock_213632761-1-2048x1331.jpeg 2048w, https:\/\/askthescientists.com\/wp-content\/uploads\/2020\/11\/AdobeStock_213632761-1-1500x975.jpeg 1500w, https:\/\/askthescientists.com\/wp-content\/uploads\/2020\/11\/AdobeStock_213632761-1-705x458.jpeg 705w\" sizes=\"(max-width: 835px) 100vw, 835px\" \/><\/p>\n<p>Les trois premiers mots qui viennent \u00e0 l\u2019esprit lorsqu\u2019on pense \u00e0 la vitamine D sont sans doute \u00ab\u2009essentiel\u2009\u00bb, \u00ab\u2009soleil\u2009\u00bb et \u00ab\u2009os\u2009\u00bb. C\u2019est un bon d\u00e9but, mais cela ne refl\u00e8te pas enti\u00e8rement la diversit\u00e9 des r\u00f4les de <a href=\"https:\/\/askthescientists.com\/qa\/vitamins\/\">l\u2019un des nutriments les plus essentiels au corps<\/a>. D\u2019ailleurs, l\u2019un des aspects que l\u2019on oublie souvent est la connexion entre la vitamine D et l\u2019immunit\u00e9.<\/p>\n<p><a href=\"https:\/\/askthescientists.com\/qa\/vitamind\/\">Le r\u00f4le de la vitamine D dans le soutien et le maintien de la sant\u00e9 osseuse est la raison fondamentale pour laquelle elle est classifi\u00e9e comme une vitamine essentielle<\/a>. Toutefois, des recherches r\u00e9centes ont d\u00e9montr\u00e9 que la vitamine D soutient aussi la sant\u00e9 immunitaire. C\u2019est en raison du fait que la vitamine liposoluble contribue \u00e0 r\u00e9guler plusieurs processus importants concernant la r\u00e9paration cellulaire naturelle et la r\u00e9ponse immunitaire saine. Ces d\u00e9couvertes, en plus de l\u2019observation de l\u2019\u00e9tat de sant\u00e9 de patients souffrant d\u2019une d\u00e9ficience en vitamine D, ont men\u00e9 \u00e0 une hausse de l\u2019int\u00e9r\u00eat accord\u00e9 au r\u00f4le de la vitamine D dans le soutien et le maintien d\u2019une bonne sant\u00e9 immunitaire.*<\/p>\n<h2><strong>Une vitamine pour soutenir deux fonctions immunitaires<\/strong><\/h2>\n<p>Nous avons \u00e9tabli et confirm\u00e9 la pertinence du r\u00f4le de la vitamine D dans le syst\u00e8me immunitaire \u00e0 la suite de la d\u00e9couverte selon laquelle presque toutes les cellules du syst\u00e8me immunitaire contiennent des r\u00e9cepteurs de vitamine D. Les effets de la vitamine D sur les cellules immunitaires sont tr\u00e8s complexes, mais des recherches ont d\u00e9montr\u00e9 que ses fonctions soutiennent le syst\u00e8me immunitaire adaptatif et inn\u00e9.*<\/p>\n<p>La fonction principale du syst\u00e8me immunitaire inn\u00e9 (ou de premi\u00e8re ligne) est de prot\u00e9ger le corps au moyen de barri\u00e8res physiques, de produits chimiques et de certaines r\u00e9ponses immunitaires. Cela comprend les cellules immunitaires (neutrophiles et macrophages) qui agissent en guise de d\u00e9fense cellulaire naturelle de premi\u00e8re ligne. Bien que le syst\u00e8me immunitaire soit rapide et efficace, il peut parfois causer des dommages collat\u00e9raux et est incapable de reconna\u00eetre les expositions r\u00e9currentes.<\/p>\n<p>Par contre, le syst\u00e8me immunitaire adaptatif est plus lent, mais plus m\u00e9thodique et sp\u00e9cialis\u00e9. La r\u00e9ponse adaptative comprend des cellules immunitaires sp\u00e9cifiques qui coordonnent la destruction de cellules infect\u00e9es (lymphocytes T) et activent et s\u00e9cr\u00e8tent des anticorps (lymphocytes B). Le syst\u00e8me adaptatif emploie une m\u00e9moire immunologique pour rapidement et \u00e9nergiquement d\u00e9fendre le corps contre les expositions r\u00e9p\u00e9titives. Cette fonction repr\u00e9sente le principe derri\u00e8re l\u2019immunit\u00e9 naturelle apr\u00e8s que les interactions immunitaires aient produits des anticorps.<\/p>\n<p>Apprenez-en plus sur <a href=\"https:\/\/askthescientists.com\/immune-system-secrets\/\">les cellules T et la r\u00e9ponse immunitaire adaptative<\/a> et passez en revue <a href=\"https:\/\/askthescientists.com\/immune-system\/\">les bases de votre syst\u00e8me immunitaire<\/a>.<\/p>\n<h2><strong>Quatre exemples illustrant comment la vitamine D contribue \u00e0 la sant\u00e9 immunitaire<\/strong><\/h2>\n<p>Il faudrait tout un manuel scolaire pour d\u00e9crire tous les r\u00f4les de la vitamine D dans la sant\u00e9 immunitaire. Heureusement, il suffit de se souvenir de ces quatre importants effets caus\u00e9s par ce nutriment qui contribue \u00e0 soutenir les d\u00e9fenses immunitaires saines pour \u00eatre en bonne voie de comprendre \u00e0 quel point <a href=\"https:\/\/askthescientists.com\/vitamin-d-executive-function-adolescents\/\">la vitamine du soleil est importante pour rester en sant\u00e9<\/a>.*<\/p>\n<h3><strong>1. <\/strong><strong>La vitamine D soutient la maturation et la fonction des cellules immunitaires cl\u00e9s*<\/strong><\/h3>\n<p>L\u2019immunit\u00e9 inn\u00e9e est un effort coordonn\u00e9 impliquant plusieurs agents cellulaires diff\u00e9rents. Les macrophages et leurs pr\u00e9curseurs monocytaires ainsi que les lymphocytes T (cellules cytotoxiques T) ont tous un r\u00f4le vital dans la r\u00e9ponse immunitaire et l\u2019immunit\u00e9 \u00e0 m\u00e9diation cellulaire (celle caus\u00e9e sans anticorps tir\u00e9 de la m\u00e9moire du syst\u00e8me immunitaire).<\/p>\n<p>La vitamine D est une composante importante dans les m\u00e9canismes soutenant la maturation et la diff\u00e9rentiation de monocytes en macrophages. Une fois devenues des macrophages sp\u00e9cialis\u00e9s, ces cellules immunitaires contribuent \u00e0 la d\u00e9fense immunitaire cellulaire de premi\u00e8re ligne. Elles participent aussi aux <a href=\"https:\/\/askthescientists.com\/autophagy-mitophagy-cellular-damage-control\/\">op\u00e9rations de nettoyage en \u00e9liminant ou assimilant les d\u00e9chets cellulaires<\/a>. De plus, les macrophages s\u00e9cr\u00e8tent une prot\u00e9ine immunitaire cl\u00e9 appel\u00e9e cath\u00e9licidine. La production r\u00e9guli\u00e8re de cath\u00e9licidine par les macrophages actifs est grandement d\u00e9pendante de la pr\u00e9sence d\u2019un niveau ad\u00e9quat de vitamine D.*<\/p>\n<h3><strong>2. La vitamine D favorise la pr\u00e9sence d\u2019antig\u00e8nes*<\/strong><\/h3>\n<p>Afin de susciter des actions d\u00e9fensives, les cellules immunitaires, comme les lymphocytes, doivent \u00eatre expos\u00e9es aux antig\u00e8nes (une prot\u00e9ine sp\u00e9cialis\u00e9e pour alerter le syst\u00e8me immunitaire). Les cellules qui contribuent le plus efficacement \u00e0 la pr\u00e9sence d\u2019antig\u00e8nes sont appel\u00e9es \u00ab\u2009cellules dendritiques\u2009\u00bb.<\/p>\n<p>L\u2019une des fonctions primaires des cellules dendritiques est de capturer les antig\u00e8nes, les traiter puis les rediriger vers le syst\u00e8me immunitaire adaptatif et initialiser l\u2019immunit\u00e9 \u00e0 m\u00e9ditation cellulaire. Les cellules dendritiques ont une importance critique dans le d\u00e9veloppement de la m\u00e9moire immunologique et la tol\u00e9rance. La vitamine D joue un r\u00f4le cl\u00e9 dans le soutien d\u2019une maturation et r\u00e9gularisation saine des cellules dendritiques humaines.*<\/p>\n<h3><strong>3. La vitamine D joue un r\u00f4le dans le soutien de la capacit\u00e9 naturelle du syst\u00e8me immunitaire \u00e0 produire les prot\u00e9ines n\u00e9cessaires \u00e0 son fonctionnement optimal*<\/strong><\/h3>\n<p>Ce lien entre la vitamine D et l\u2019immunit\u00e9 procure de l\u2019armement biologique dont le syst\u00e8me immunitaire a besoin pour vous garder en sant\u00e9. La vitamine D contribue \u00e0 maintenir une bonne r\u00e9gularisation de la production de prot\u00e9ines sp\u00e9cifiques qui favorise de bonnes fonctions immunitaires.<\/p>\n<p>On peut d\u2019ailleurs illustrer cet effet b\u00e9n\u00e9fique dans les poumons, dans lesquels les cellules immunitaires et les cellules \u00e9pith\u00e9liales sont dot\u00e9es d\u2019un grand nombre de r\u00e9cepteurs de vitamine D. Les chercheurs \u00e9tudiants ces r\u00e9cepteurs de vitamine D dans les tissus pulmonaires ont d\u00e9couvert que la vitamine D active participe aux soutiens de l\u2019activit\u00e9 d\u2019un compos\u00e9 qui maintient le bon fonctionnement immunitaire des poumons. Elle aide aussi \u00e0 soutenir la production d\u2019une prot\u00e9ine qui encourage les cellules \u00e0 performer r\u00e9guli\u00e8rement leurs activit\u00e9s naturelles.*<\/p>\n<h3><strong>4. La vitamine D pr\u00eate main-forte aux cellules T<\/strong><\/h3>\n<p>La capacit\u00e9 de la vitamine D \u00e0 favoriser la diff\u00e9renciation et le d\u00e9veloppement sain des cellules immunitaires s\u2019applique aussi \u00e0 l\u2019immunit\u00e9 adaptative. La vitamine D aide les cellules de type T.*<\/p>\n<p>Les cellules T sont d\u2019abord des cellules inactives, ou na\u00efves. Afin d\u2019aider \u00e0 la d\u00e9fense du corps, elles doivent premi\u00e8rement faire la transition en une cellule tueuse ou un lymphocyte T auxiliaire pour participer \u00e0 la r\u00e9ponse immunitaire. La vitamine D contribue aux processus naturels de mobilisation et d\u2019activation servant \u00e0 vous garder en sant\u00e9. De plus, elle favorise le maintien d\u2019une bonne migration des cellules T entre certains tissus, comme la peau, le tube digestif et le ganglion lymphatique.*<\/p>\n<h2><strong>Exploiter ses connaissances sur la vitamine D et l\u2019immunit\u00e9<\/strong><\/h2>\n<p>Il ne s\u2019agit que d\u2019un survol de base concernant le r\u00f4le de la vitamine D dans les fonctions immunitaires. Les moyens dont la vitamine D favorise le maintien de la sant\u00e9 du syst\u00e8me immunitaire sont tr\u00e8s complexes et est une question d\u2019\u00e9quilibre. On veut que le syst\u00e8me immunitaire ne soit ni trop rigoureux, ni trop n\u00e9gligent. Il est important de maintenir un niveau sain de vitamine D pour conserver l\u2019\u00e9quilibre g\u00e9n\u00e9ral et le bon fonctionnement du syst\u00e8me immunitaire.*<\/p>\n<p>Si vous avez des doutes concernant votre niveau de vitamine D actuel, il est important de vous informer aupr\u00e8s d\u2019un professionnel de la sant\u00e9. Des concentrations sanguines entre 30\u00a0ng\/ml et 50\u00a0ng\/ml sont consid\u00e9r\u00e9s comme optimaux aux yeux de la plupart des experts.<\/p>\n<p>Donc, afin <a href=\"https:\/\/askthescientists.com\/build-immunity\/\">d\u2019am\u00e9liorer votre immunit\u00e9<\/a>, assurez-vous que votre corps fasse le plein de vitamine D. Il suffit de prendre un peu de soleil. Adaptez aussi votre alimentation davantage d\u2019aliments riches en vitamine D. Vous pouvez aussi vous tourner vers les suppl\u00e9ments si vous vivez plus au nord ou si vos choix alimentaires discutables causent des d\u00e9ficiences dans votre alimentation qui rendent difficile l\u2019atteinte d\u2019un taux optimal.*<\/p>\n<div  class='togglecontainer av-1945gvq-dde14e1e5b3f88409cd5bed9b2a4dca1  avia-builder-el-0  avia-builder-el-no-sibling  toggle_close_all' >\n<section class='av_toggle_section av-lqetti-1a1e901da06521e65603bb5ffbc967aa'  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div role=\"tablist\" class=\"single_toggle\" data-tags=\"{All} \"  ><p id='toggle-toggle-id-1' data-fake-id='#toggle-id-1' class='toggler  av-title-above '  itemprop=\"headline\"  role='tab' tabindex='0' aria-controls='toggle-id-1' data-slide-speed=\"200\" data-title=\"R\u00e9f\u00e9rences\" data-title-open=\"\" data-aria_collapsed=\"Click to expand: R\u00e9f\u00e9rences\" data-aria_expanded=\"Click to collapse: R\u00e9f\u00e9rences\">R\u00e9f\u00e9rences<span class=\"toggle_icon\"><span class=\"vert_icon\"><\/span><span class=\"hor_icon\"><\/span><\/span><\/p><div id='toggle-id-1' aria-labelledby='toggle-toggle-id-1' role='region' class='toggle_wrap  av-title-above'  ><div class='toggle_content invers-color '  itemprop=\"text\" ><p><a href=\"https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC3166406\/\">https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC3166406\/<\/a><\/p>\n<p><a href=\"https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC2879394\/\">https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC2879394\/<\/a><\/p>\n<p><a href=\"https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC3738984\/\">https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC3738984\/<\/a><\/p>\n<p><a href=\"http:\/\/www.jimmunol.org\/content\/181\/10\/7090.full.pdf?fbclid=IwAR12SVry6ShZLIgXHiRUC16NIVDgzD6SY1JPOWLenYM0N-iV5DB8Mubo4Zw\">http:\/\/www.jimmunol.org\/content\/181\/10\/7090.full.pdf<\/a><\/p>\n<p><a href=\"https:\/\/www.nature.com\/articles\/nrneurol.2016.49\">https:\/\/www.nature.com\/articles\/nrneurol.2016.49<\/a><\/p>\n<p><a href=\"https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC4586578\/\">https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC4586578\/<\/a><\/p>\n<p><a href=\"https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC3194221\/\">https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC3194221\/<\/a><\/p>\n<p><a href=\"https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC3200473\/\">https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC3200473\/<\/a><\/p>\n<\/div><\/div><\/div><\/section>\n<\/div>\n<p class=\"fda\">*Ces all\u00e9gations n\u2019ont pas \u00e9t\u00e9 \u00e9valu\u00e9es par la Food and Drug Administration (F\u00e9d\u00e9ration am\u00e9ricaine des aliments et drogues). Ce produit ne pr\u00e9tend diagnostiquer, soigner, gu\u00e9rir ou pr\u00e9venir aucune maladie.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les trois premiers mots qui viennent \u00e0 l\u2019esprit lorsqu\u2019on pense \u00e0 la vitamine D sont sans doute \u00ab\u2009essentiel\u2009\u00bb, \u00ab\u2009soleil\u2009\u00bb et \u00ab\u2009os\u2009\u00bb. C\u2019est un bon d\u00e9but, mais cela ne refl\u00e8te pas enti\u00e8rement la diversit\u00e9 des r\u00f4les de l\u2019un des nutriments les plus essentiels au corps. D\u2019ailleurs, l\u2019un des aspects que l\u2019on oublie souvent est la connexion [&hellip;]<\/p>\n","protected":false},"author":4638,"featured_media":51571,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[284],"tags":[20755,20715,20732],"class_list":["post-51597","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-nutrition_spotlight-fr","tag-essential-nutrients-fr","tag-immune-function-fr","tag-nutrition-basics-fr"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>La vitamine D et l\u2019immunit\u00e9 : les fa\u00e7ons dont la vitamine D contribue \u00e0 la sant\u00e9 immunitaire - Ask The Scientists<\/title>\n<meta name=\"description\" content=\"La vitamine D et l\u2019immunit\u00e9 sont reli\u00e9es de fa\u00e7ons importantes. 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