{"id":63791,"date":"2024-08-02T01:45:54","date_gmt":"2024-08-02T08:45:54","guid":{"rendered":"https:\/\/www.chronobiology.com\/nya-hogupplosta-3d-kartor-visar-hur-hjarnans-blodkarl-forandras-med-aldern\/"},"modified":"2024-09-04T03:03:54","modified_gmt":"2024-09-04T10:03:54","slug":"nya-hogupplosta-3d-kartor-visar-hur-hjarnans-blodkarl-forandras-med-aldern","status":"publish","type":"post","link":"https:\/\/dev.chronobiology.com\/sv\/nya-hogupplosta-3d-kartor-visar-hur-hjarnans-blodkarl-forandras-med-aldern\/","title":{"rendered":"Nya h\u00f6guppl\u00f6sta 3D-kartor visar hur hj\u00e4rnans blodk\u00e4rl f\u00f6r\u00e4ndras med \u00e5ldern"},"content":{"rendered":"<p>Friska blodk\u00e4rl \u00e4r inte bara viktigt f\u00f6r hj\u00e4rth\u00e4lsan.<br \/>\nV\u00e4lm\u00e5ende blodk\u00e4rl \u00e4r avg\u00f6rande f\u00f6r hj\u00e4rnans h\u00e4lsa och potentiellt f\u00f6r att bek\u00e4mpa \u00e5ldersrelaterad kognitiv f\u00f6rs\u00e4mring och <a href=\"https:\/\/www.chronobiology.com\/generation-of-new-neurons-in-the-brain-as-a-strategy-against-neurodegenerative-diseases\/\" target=\"_blank\" rel=\"noopener\">neurodegenerativa sjukdomar<\/a> som Alzheimers <a href=\"https:\/\/www.chronobiology.com\/generation-of-new-neurons-in-the-brain-as-a-strategy-against-neurodegenerative-diseases\/\" target=\"_blank\" rel=\"noopener\">sjukdom<\/a>, enligt en ny studie ledd av Penn State-forskare.<br \/>\nResultaten pekar p\u00e5 en tidigare underskattad men potentiellt avg\u00f6rande roll som hj\u00e4rnans vaskul\u00e4ra n\u00e4tverk &#8211; eller energiinfrastruktur &#8211; spelar i uppkomsten av neurodegenerativa sjukdomar.<br \/>\nDe publicerade sitt arbete i <a href=\"https:\/\/www.nature.com\/articles\/s41467-024-50559-8\" target=\"_blank\" rel=\"noopener\"><em>Nature Communications<\/em><\/a>.<br \/>\nMed hj\u00e4lp av avancerad avbildningsteknik skapade teamet kartor \u00f6ver hj\u00e4rnan hos m\u00f6ss som illustrerar hur k\u00e4rlceller och strukturer som blodk\u00e4rl f\u00f6r\u00e4ndras med \u00e5ldern och identifierade omr\u00e5den som \u00e4r ben\u00e4gna att f\u00f6rs\u00e4mras.<br \/>\nN\u00e4r blodk\u00e4rlen f\u00f6rs\u00e4mras ber\u00f6vas nervcellerna i hj\u00e4rnan, de s\u00e5 kallade neuronerna, energi s\u00e5 att de inte l\u00e4ngre fungerar som de ska eller d\u00f6r.<br \/>\nDetta kan leda till ett tillst\u00e5nd som kallas vaskul\u00e4r <a href=\"https:\/\/www.chronobiology.com\/sleeping-more-than-eight-hours-early-bedtime-linked-to-dementia\/\" target=\"_blank\" rel=\"noopener\">demens<\/a>, den n\u00e4st vanligaste orsaken till kognitiv neds\u00e4ttning hos \u00e4ldre vuxna, och symtom som s\u00f6mnst\u00f6rningar.        <\/p>\n<h2>Detaljerad karta \u00f6ver k\u00e4rln\u00e4tverket i hj\u00e4rnan hj\u00e4lper till att identifiera de omr\u00e5den som selektivt degenererar vid h\u00f6g \u00e5lder<\/h2>\n<p>  &#8221;I ett fall som <a href=\"https:\/\/www.chronobiology.com\/light-therapy-protects-the-brain-against-toxic-buildup-that-leads-to-alzheimers\/\" target=\"_blank\" rel=\"noopener\">Alzheimers sjukdom<\/a> har celld\u00f6den redan intr\u00e4ffat n\u00e4r man kan se k\u00e4rlf\u00f6r\u00e4ndringar och en betydande krympning av hj\u00e4rnan p\u00e5 magnetr\u00f6ntgen.<br \/>\nVi m\u00e5ste f\u00f6rst\u00e5 hur dessa celler och strukturer f\u00f6r\u00e4ndras innan en st\u00f6rre katastrof intr\u00e4ffar&#8221;, s\u00e4ger Yongsoo Kim, docent i neuro- och beteendevetenskap vid Penn State College of Medicine och huvudf\u00f6rfattare till studien.<br \/>\nDenna studie ger tidiga tecken p\u00e5 neurodegenerativa sjukdomar som kan leda till tidigare diagnos och ledtr\u00e5dar till hur man kan bromsa <a href=\"https:\/\/www.chronobiology.com\/understanding-how-aging-of-eyes-disrupts-circadian-rhythm\/\" target=\"_blank\" rel=\"noopener\">\u00e5ldrandeprocessen<\/a> och kognitiva f\u00f6r\u00e4ndringar.<br \/>\nEnligt Kim \u00e4r \u00e5ldrandet en av de viktigaste faktorerna som \u00e4r inblandade i neurodegenerativa sjukdomar.<br \/>\nForskarna vet dock inte exakt hur normalt \u00e5ldrande f\u00f6r\u00e4ndrar hj\u00e4rnan och i synnerhet inte hj\u00e4rnans k\u00e4rlsystem.    <a href=\"https:\/\/www.chronobiology.com\/wp-content\/uploads\/2024\/08\/mol.jpg\"><img decoding=\"async\" class=\"alignright wp-image-63304 size-medium\" title=\"L\u00e4kare,och,patient,som,lider,av,Alzheimers,sjukdom\" src=\"https:\/\/www.chronobiology.com\/wp-content\/uploads\/2024\/08\/mol-300x200.jpg\" alt=\"L\u00e4kare,och,patient,som,lider,av,Alzheimers,sjukdom\" width=\"300\" height=\"200\" srcset=\"https:\/\/dev.chronobiology.com\/wp-content\/uploads\/2024\/08\/mol-300x200.jpg 300w, https:\/\/dev.chronobiology.com\/wp-content\/uploads\/2024\/08\/mol-768x513.jpg 768w, https:\/\/dev.chronobiology.com\/wp-content\/uploads\/2024\/08\/mol.jpg 1000w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a>  I takt med att befolkningen \u00e5ldras \u00e4r det viktigt att f\u00f6rst\u00e5 dessa f\u00f6r\u00e4ndringar, s\u00e4rskilt inom blodk\u00e4rlsn\u00e4tverket.<br \/>\nBlodk\u00e4rlen, s\u00e4rskilt mikrok\u00e4rlen, reglerar tillf\u00f6rseln av syre och energi samt avl\u00e4gsnandet av avfallsprodukter till och fr\u00e5n nervcellerna.<br \/>\nTrots blodk\u00e4rlens betydelse, s\u00e4ger Kim, fokuserar den mesta forskningen p\u00e5 hur nervcellernas struktur och funktion degenererar \u00f6ver tid, snarare \u00e4n p\u00e5 blodk\u00e4rlen.<br \/>\nN\u00e4r forskare tittar p\u00e5 hj\u00e4rnans k\u00e4rlsystem studerar de i f\u00f6rsta hand st\u00f6rre blodk\u00e4rl eller fokuserar p\u00e5 ett enda, l\u00e4ttillg\u00e4ngligt omr\u00e5de i hj\u00e4rnan, den somatosensoriska hj\u00e4rnbarken.<br \/>\n\u00c4nnu viktigare \u00e4r att typiska avbildningstekniker som MR inte har tillr\u00e4ckligt h\u00f6g uppl\u00f6sning f\u00f6r att se vad som h\u00e4nder i de sm\u00e5 blodk\u00e4rlen, som enligt experter utg\u00f6r 80 till 85% av hj\u00e4rnans k\u00e4rlsystem.<br \/>\nKim och hans forskargrupp skapade en detaljerad karta \u00f6ver k\u00e4rln\u00e4tverket i hela mushj\u00e4rnan med hj\u00e4lp av tv\u00e5 h\u00f6guppl\u00f6sta 3D-kartl\u00e4ggningstekniker: seriell tv\u00e5fotontomografi &#8211; en teknik som producerar en serie staplade 2D-bilder &#8211; och fluorescensmikroskopi med ljusark, som avbildar intakta 3D-prover f\u00f6r att visualisera hela hj\u00e4rnan med encellsuppl\u00f6sning.<br \/>\nForskarna unders\u00f6kte hj\u00e4rnorna hos unga och gamla m\u00f6ss f\u00f6r att kartl\u00e4gga f\u00f6r\u00e4ndringarna i hj\u00e4rnans k\u00e4rlsystem under den normala \u00e5ldringsprocessen.<br \/>\nEftersom de utf\u00f6r h\u00f6guppl\u00f6st kartl\u00e4ggning med tillr\u00e4cklig uppl\u00f6sning kan forskarna rekonstruera hela k\u00e4rlstrukturen och skanna hela hj\u00e4rnan f\u00f6r att identifiera de omr\u00e5den som selektivt degenererar med \u00e5ldern.<br \/>\nExperterna fann att det omr\u00e5de som de flesta m\u00e4nniskor unders\u00f6ker uppvisar minst f\u00f6r\u00e4ndring, medan djupg\u00e5ende f\u00f6r\u00e4ndringar sker i omr\u00e5den djupt inne i hj\u00e4rnan.<br \/>\nBilderna visade att f\u00f6r\u00e4ndringarna i k\u00e4rln\u00e4tverket inte \u00e4r lika uttalade \u00f6verallt i hj\u00e4rnan.<br \/>\nSnarare var de koncentrerade till den basala framhj\u00e4rnan, de djupa kortikala lagren och hippocampusn\u00e4tverket, vilket tyder p\u00e5 att dessa omr\u00e5den \u00e4r mer k\u00e4nsliga f\u00f6r vaskul\u00e4r degeneration.<br \/>\nDessa omr\u00e5den spelar bland annat en roll f\u00f6r uppm\u00e4rksamhet, s\u00f6mn, <a href=\"https:\/\/www.chronobiology.com\/sleep-apnea-can-impair-memory\/\" target=\"_blank\" rel=\"noopener\">minnesbearbetning och minneslagring<\/a>.             <\/p>\n<h2>Hopp om framtida behandlingar av neurodegenerativa sjukdomar<\/h2>\n<p>  N\u00e4r hj\u00e4rnan \u00e5ldras minskar k\u00e4rll\u00e4ngden och f\u00f6rgreningsdensiteten med cirka 10%, vilket tyder p\u00e5 att blodf\u00f6rdelningsn\u00e4tet \u00e4r glesare.<br \/>\nDessutom \u00e4r art\u00e4rerna i \u00e4ldre hj\u00e4rnor mer kr\u00f6kta j\u00e4mf\u00f6rt med dem i yngre hj\u00e4rnor, vilket kan hindra blodfl\u00f6det, s\u00e4rskilt i omr\u00e5den som ligger l\u00e4ngre bort fr\u00e5n huvudart\u00e4rerna, t.ex. de djupa kortikala lagren.<br \/>\nTeamet tittade ocks\u00e5 p\u00e5 funktionella f\u00f6r\u00e4ndringar i k\u00e4rlen och fann att systemet reagerar l\u00e5ngsammare i \u00e4ldre hj\u00e4rnor.<br \/>\nDet inneb\u00e4r att det inte kan f\u00f6rse nervcellerna med energi lika snabbt och enkelt som cellerna beh\u00f6ver det.<br \/>\nDet sker ocks\u00e5 en f\u00f6rlust av pericyter, en typ av celler som reglerar blodtillf\u00f6rseln och blodk\u00e4rlens genomsl\u00e4pplighet.<br \/>\nSom en f\u00f6ljd av detta blir blodk\u00e4rlen &#8221;l\u00e4ckande&#8221;, vilket \u00e4ventyrar <a href=\"https:\/\/www.chronobiology.com\/discovery-that-circadian-rhythm-regulates-blood-brain-barrier-may-lead-to-improved-treatment-options\/\" target=\"_blank\" rel=\"noopener\">blod-hj\u00e4rnbarri\u00e4ren<\/a>.<br \/>\nDenna studie bygger p\u00e5 gruppens tidigare forskning d\u00e4r de kartlagt k\u00e4rlsystemet i en ung mushj\u00e4rna.<br \/>\nH\u00e4rn\u00e4st kommer de att unders\u00f6ka hur de f\u00f6r\u00e4ndringar i hj\u00e4rnan som orsakas av Alzheimers sjukdom p\u00e5verkar k\u00e4rlh\u00e4lsan och nervcellernas funktion.<br \/>\nI slut\u00e4ndan hoppas de att deras arbete ska leda till behandlingar f\u00f6r neurodegenerativa sjukdomar.        <\/p>\n","protected":false},"excerpt":{"rendered":"<p>Friska blodk\u00e4rl \u00e4r inte bara viktigt f\u00f6r hj\u00e4rth\u00e4lsan. V\u00e4lm\u00e5ende blodk\u00e4rl \u00e4r avg\u00f6rande f\u00f6r hj\u00e4rnans h\u00e4lsa och potentiellt f\u00f6r att bek\u00e4mpa \u00e5ldersrelaterad kognitiv f\u00f6rs\u00e4mring och neurodegenerativa sjukdomar som Alzheimers sjukdom, enligt en ny studie ledd av Penn State-forskare. Resultaten pekar p\u00e5 en tidigare underskattad men potentiellt avg\u00f6rande roll som hj\u00e4rnans vaskul\u00e4ra n\u00e4tverk &#8211; eller energiinfrastruktur &#8211; [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":63337,"comment_status":"closed","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":[309,329],"tags":[],"class_list":{"0":"post-63791","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-aldrande-sv","8":"category-mental-halsa","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>Nya h\u00f6guppl\u00f6sta 3D-kartor visar hur hj\u00e4rnans blodk\u00e4rl f\u00f6r\u00e4ndras med \u00e5ldern &#8211; Chronobiology.com<\/title>\n<meta name=\"description\" content=\"Friska blodk\u00e4rl \u00e4r inte bara viktigt f\u00f6r hj\u00e4rth\u00e4lsan. 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