{"id":60076,"date":"2016-05-13T11:04:29","date_gmt":"2016-05-13T18:04:29","guid":{"rendered":"https:\/\/www.chronobiology.com\/unraveling-mysteries-biological-rhythms-suprachiasmatic-nucleus\/"},"modified":"2024-07-18T15:24:45","modified_gmt":"2024-07-18T22:24:45","slug":"svelare-i-misteri-dei-nostri-ritmi-biologici-il-nucleo-soprachiasmatico","status":"publish","type":"post","link":"https:\/\/dev.chronobiology.com\/it\/svelare-i-misteri-dei-nostri-ritmi-biologici-il-nucleo-soprachiasmatico\/","title":{"rendered":"Svelare i misteri dei nostri ritmi biologici: Il nucleo soprachiasmatico"},"content":{"rendered":"<p>Il nucleo soprachiasmatico, o SCN, \u00e8 considerato il &#8220;master clock&#8221; del corpo umano. La comprensione del SCN \u00e8 fondamentale per svelare i segreti dell&#8217;orologio interno del corpo.<\/p>\n<p>Il nucleo soprachiasmatico \u00e8 la fonte dei nostri ritmi biologici innati, coordinando una serie di processi fisiologici ai livelli ambientali di luce e buio. Nonostante la sua importanza, in passato si sapeva poco su come quest&#8217;area del cervello riceve e sintetizza le informazioni. Tuttavia, gli scienziati stanno iniziando a capire meglio il funzionamento dei nostri orologi interni grazie a un nuovo studio che utilizza una neurotossina proveniente da una fonte sorprendente: il pesce palla.<\/p>\n<h2>I tempi del cervello<\/h2>\n<p>Quando la retina percepisce la luce, trasmette le informazioni ai centri di visione del cervello. Tuttavia, inviano messaggi anche a <a href=\"http:\/\/www.hhmi.org\/biointeractive\/human-suprachiasmatic-nucleus\" target=\"_blank\" rel=\"noopener\">un&#8217;area dell&#8217;ipotalamo chiamata nucleo soprachiasmatico<\/a>. Situata appena sopra il chiasma ottico, questa piccola sezione dell&#8217;ipotalamo \u00e8 appaiata (una per lato) e ha la forma di un&#8217;ala. Come la maggior parte delle aree del cervello, il SCN \u00e8 ricco di neuroni. Questi neuroni ricevono i segnali dagli occhi, li elaborano e inviano segnali che mantengono il cervello e il corpo in perfetta sintonia.<\/p>\n<p>Il nucleo soprachiasmatico \u00e8 intimamente coinvolto nella produzione e nel rilascio di ormoni, nel ciclo sonno-veglia, nella regolazione della temperatura e in una serie di altri importanti compiti fisiologici. Quando quest&#8217;area \u00e8 compromessa, come nel caso di patologie cerebrali degenerative come il <a href=\"https:\/\/www.chronobiology.com\/sleeping-on-your-side-could-reduce-risk-of-alzheimers-and-parkinsons\/\" target=\"_blank\" rel=\"noopener\">morbo di Alzheimer<\/a>, il risultato \u00e8 un&#8217;alterazione del <a href=\"https:\/\/www.chronobiology.com\/about-chronobiology\/#CircadianRhythm\" target=\"_blank\" rel=\"noopener\">ritmo circadiano<\/a> e la conseguente perdita dei normali schemi del sonno.<\/p>\n<h2>L&#8217;SCN e gli orologi interni<\/h2>\n<p>Purtroppo \u00e8 stato difficile determinare con esattezza il funzionamento del SCN, perch\u00e9 il suo complesso intreccio \u00e8 collegato a diverse attivit\u00e0. Ogni cellula di quest&#8217;area del cervello genera un proprio ritmo ad ogni &#8220;tic-tac&#8221; dell&#8217;orologio interno del corpo. Questi ritmi, detti &#8220;micro-ritmi&#8221;, si sommano per controllare il ritmo biologico in vari modi. In assenza di luce, la ghiandola pineale \u00e8 indotta a produrre melatonina, mentre in presenza di luce il cervello induce le ghiandole surrenali a produrre cortisolo. Questi ormoni interagiscono anche con il metabolismo, permettendo all&#8217;organismo di coordinare le attivit\u00e0 con la veglia e il sonno. Il costante impegno del SCN rende difficile misurare l&#8217;attivit\u00e0 a causa del costante &#8220;rumore&#8221;.<\/p>\n<h2>Pesce palla e attivit\u00e0 cerebrale<\/h2>\n<p><a href=\"https:\/\/www.chronobiology.com\/wp-content\/uploads\/2016\/05\/unraveling-the-mysteries-of-our-biological-rhythms-the-suprachiasmatic-nucleus.jpg\"><img decoding=\"async\" class=\"alignright size-medium wp-image-9064\" src=\"https:\/\/www.chronobiology.com\/wp-content\/uploads\/2016\/05\/unraveling-the-mysteries-of-our-biological-rhythms-the-suprachiasmatic-nucleus-300x199.jpg\" alt=\"Unraveling the Mysteries of our Biological Rhythms: The Suprachiasmatic Nucleus\" width=\"300\" height=\"199\" srcset=\"https:\/\/dev.chronobiology.com\/wp-content\/uploads\/2016\/05\/unraveling-the-mysteries-of-our-biological-rhythms-the-suprachiasmatic-nucleus-300x200.jpg 300w, https:\/\/dev.chronobiology.com\/wp-content\/uploads\/2016\/05\/unraveling-the-mysteries-of-our-biological-rhythms-the-suprachiasmatic-nucleus-768x510.jpg 768w, https:\/\/dev.chronobiology.com\/wp-content\/uploads\/2016\/05\/unraveling-the-mysteries-of-our-biological-rhythms-the-suprachiasmatic-nucleus.jpg 800w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a>Per isolare l&#8217;attivit\u00e0 del nucleo soprachiasmatico, <a href=\"http:\/\/www.seas.harvard.edu\/news\/2016\/05\/mapping-circuit-of-our-internal-clock\" target=\"_blank\" rel=\"noopener\">gli scienziati<\/a> hanno <a href=\"http:\/\/www.seas.harvard.edu\/news\/2016\/05\/mapping-circuit-of-our-internal-clock\" target=\"_blank\" rel=\"noopener\">utilizzato una neurotossina del pesce palla<\/a> per bloccare la comunicazione da e verso la regione. Questa tossina <a href=\"http:\/\/www.cdc.gov\/niosh\/ershdb\/emergencyresponsecard_29750019.html\" target=\"_blank\" rel=\"noopener\">blocca i canali del sodio negli assoni nervosi<\/a>, impedendo loro di inviare messaggi ad altre aree del cervello. Quando l&#8217;ingresso e l&#8217;uscita dal SCN sono stati bloccati, l&#8217;attivit\u00e0 oscillante a impulsi di quest&#8217;area del cervello \u00e8 diventata caotica e imprevedibile. Quando la neurotossina \u00e8 stata rimossa, il nucleo soprachiasmatico ha ripreso a oscillare secondo uno schema prevedibile. Sembra che siano i neuroni al centro dell&#8217;organo a stabilire il ritmo, inviando messaggi in modo schematico ai neuroni intorno a loro e, in misura minore, a quelli successivi.<\/p>\n<p>Cosa significa questo per la futura ricerca cronobiologica? Ora che gli scienziati hanno compreso il modo in cui i neuroni del SCN sono collegati, saranno in grado di capire meglio come questa parte enigmatica dell&#8217;ipotalamo governa gran parte della nostra fisiologia. Questa comprensione, a sua volta, pu\u00f2 portare a trattamenti migliori per le persone che soffrono di disturbi del ritmo circadiano e di altri disturbi influenzati da questa piccola sezione del cervello.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Il nucleo soprachiasmatico, o SCN, \u00e8 considerato il &#8220;master clock&#8221; del corpo umano. La comprensione del SCN \u00e8 fondamentale per svelare i segreti dell&#8217;orologio interno del corpo. Il nucleo soprachiasmatico \u00e8 la fonte dei nostri ritmi biologici innati, coordinando una serie di processi fisiologici ai livelli ambientali di luce e buio. Nonostante la sua importanza, [&hellip;]<\/p>\n","protected":false},"author":15,"featured_media":24386,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[172,221],"tags":[],"class_list":{"0":"post-60076","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-il-ritmo-circadiano","8":"category-salute-delle-cellule","9":"entry"},"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.4 (Yoast SEO v23.4) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Unraveling the Mysteries of our Biological Rhythms: The Suprachiasmatic Nucleus<\/title>\n<meta name=\"description\" content=\"The suprachiasmatic nucleus, or SCN, is considered the \u201cmaster clock\u201d of the human body. 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