\u0130nsan karaci\u011ferinin karma\u015f\u0131k biyolojisi ve metabolik fonksiyonlar\u0131n\u0131 laboratuvar ortam\u0131nda yeniden olu\u015fturmak, hepatoloji ve doku m\u00fchendisli\u011finde y\u0131llard\u0131r a\u015f\u0131lmas\u0131 g\u00fc\u00e7 bir engeldi. Bu zorluklar\u0131n \u00fcstesinden gelerek, Keio \u00dcniversitesi ara\u015ft\u0131rmac\u0131lar\u0131 insan yeti\u015fkin hepatositlerinden olu\u015fan organoidler geli\u015ftirmeyi ba\u015fard\u0131. Bu \u00fc\u00e7 boyutlu mini karaci\u011fer modelleri, \u00f6nceki \u00e7al\u0131\u015fmalarda m\u00fcmk\u00fcn olmayan olgun metabolik aktivite g\u00f6sterebilme \u00f6zelli\u011fine sahip olarak karaci\u011fer biyolojisi \u00e7al\u0131\u015fmalar\u0131nda \u00e7\u0131\u011f\u0131r a\u00e7\u0131c\u0131 bir geli\u015fme olarak de\u011ferlendiriliyor. Bu devrim niteli\u011findeki ara\u015ft\u0131rma, karaci\u011fer hastal\u0131klar\u0131n\u0131n tedavisinde ve rejeneratif t\u0131pta yeni ufuklar\u0131n a\u00e7\u0131lmas\u0131n\u0131 sa\u011fl\u0131yor.<\/p>\n
Karaci\u011fer, v\u00fccut i\u00e7inde \u00e7ok say\u0131da biyokimyasal s\u00fcreci ayn\u0131 anda y\u00fcr\u00fcten e\u015fsiz bir organd\u0131r. Glikoz reg\u00fclasyonundan safra asidi salg\u0131s\u0131na kadar bir\u00e7ok kritik fonksiyona sahip olan bu organ\u0131n y\u00fcksek enerji gereksinimi ve karma\u015f\u0131k yap\u0131s\u0131, hepatositlerin laboratuvar ko\u015fullar\u0131nda uzun s\u00fcre sa\u011fl\u0131kl\u0131 kalmas\u0131n\u0131 zorla\u015ft\u0131r\u0131yordu. Ancak, mevcut k\u00fclt\u00fcr tekniklerinde izole edilmi\u015f hepatositler genellikle 1-2 hafta i\u00e7inde \u00f6zelliklerini kaybedip, safra kanallar\u0131n\u0131 d\u00f6\u015feyen kolanjiosit benzeri h\u00fccrelere d\u00f6n\u00fc\u015ferek fonksiyonlar\u0131n\u0131 yitiriyordu. \u0130\u015fte bu s\u0131n\u0131rl\u0131l\u0131k, Keio \u00dcniversitesi ara\u015ft\u0131rmac\u0131lar\u0131n\u0131n \u00e7al\u0131\u015fmas\u0131yla a\u015f\u0131lm\u0131\u015f oldu.<\/p>\n
Ara\u015ft\u0131rma ekibi, hasta k\u00f6kenli, kriyoprezervasyon y\u00f6ntemiyle dondurulmu\u015f insan yeti\u015fkin hepatositlerini temel ald\u0131. Buradaki yenilik\u00e7i ad\u0131m ise, organoid k\u00fclt\u00fcrlerinde daha \u00f6nce kullan\u0131lmayan bir sitokin olan onkostatin M’nin uygulanmas\u0131 oldu. Onkostatin M, iltihaplanma sinyal yolaklar\u0131nda g\u00f6rev yapan bir molek\u00fcl olup, hepatositlerde ola\u011fan\u00fcst\u00fc bir proliferasyon faz\u0131 ba\u015flatarak organoid say\u0131s\u0131n\u0131n milyon kat artmas\u0131n\u0131 sa\u011flad\u0131. Daha \u00f6nce benzeri \u00e7o\u011falma oranlar\u0131na ula\u015f\u0131lamam\u0131\u015f olmas\u0131 bu ke\u015ffi daha da \u00f6nemli k\u0131ld\u0131.<\/p>\n
Geli\u015ftirilen organoidler \u00fc\u00e7 ay boyunca canl\u0131l\u0131k ve \u00e7o\u011falma kapasitelerini s\u00fcrd\u00fcrebildiler ve hatta alt\u0131 ay boyunca farkl\u0131la\u015fma potansiyellerini kaybetmeden ya\u015famaya devam ettiler. Bu uzun \u00f6m\u00fcrl\u00fcl\u00fck, daha \u00f6nce m\u00fcmk\u00fcn olmayan uzun s\u00fcreli fonksiyonel inceleme ve hastal\u0131k modellerinin denenmesine olanak tan\u0131yor. Ayr\u0131ca, ekip yeni kimyasal bazl\u0131, hormon destekli bir farkl\u0131la\u015fma protokol\u00fc geli\u015ftirerek hepatositlerin olgunla\u015fmas\u0131n\u0131 tetikledi. Bu s\u00fcre\u00e7 sonucunda organoidler, glikoz, \u00fcre, kolesterol, trigliserid ve safra asidi sentezi ve salg\u0131s\u0131 gibi temel karaci\u011fer fonksiyonlar\u0131n\u0131 hayata ge\u00e7irdi.<\/p>\n
Organoidlerde dikkat \u00e7eken ba\u015far\u0131 ise safra kanal\u0131n\u0131 and\u0131ran mikro t\u00fcb\u00fcler yap\u0131lar\u0131n geli\u015fimi oldu. Bu yap\u0131larda safra asitlerinin ta\u015f\u0131nmas\u0131 sa\u011flanarak karaci\u011ferin \u00f6zg\u00fcn mimarisi taklit edildi. Safra kanalc\u0131klar\u0131n\u0131n varl\u0131\u011f\u0131, hepatobiliyer hastal\u0131k modellerinin olu\u015fturulmas\u0131 ve safra asidi metabolizmas\u0131n\u0131 hedefleyen ila\u00e7lar\u0131n de\u011ferlendirilmesinde \u00f6nemli bir avantaj sunuyor. Ayr\u0131ca salg\u0131lanan albumin miktar\u0131, mevcut hepatosit k\u00fclt\u00fcr sistemlerini ge\u00e7erek insan karaci\u011fer fonksiyonunu laboratuvar ortam\u0131nda ba\u015far\u0131yla yans\u0131tt\u0131.<\/p>\n
Onkostatin M\u2019nin hepatosit proliferasyonundaki rol\u00fc teknik bir ba\u015far\u0131 olman\u0131n \u00f6tesinde karaci\u011fer biyolojisinin molek\u00fcler mekanizmalar\u0131n\u0131 ayd\u0131nlat\u0131yor. Sorumlu ara\u015ft\u0131rmac\u0131 Toshiro Sato\u2019ya g\u00f6re, onkostatin M yeti\u015fkin karaci\u011fer h\u00fccrelerinin yenilenme ve farkl\u0131la\u015fma potansiyelini \u2018kilitleyen\u2019 yeni bir anahtar\u0131 temsil ediyor. Daha \u00f6nce organoid b\u00fcy\u00fcmesini tetikleyen birka\u00e7 molek\u00fcl bilinmekteyken, bu sitokin karaci\u011fer modellemesi i\u00e7in yeni ufuklar a\u00e7t\u0131.<\/p>\n
Geli\u015ftirilen bu teknoloji, tedavi ama\u00e7l\u0131 preklinik modellerde umut verici sonu\u00e7lar g\u00f6sterdi. Ba\u011f\u0131\u015f\u0131kl\u0131k sistemi bask\u0131lanm\u0131\u015f ve karaci\u011fer fonksiyonlar\u0131 bozulmu\u015f farelere insan hepatosit organoidleri nakledildi\u011finde, organoidler ba\u015far\u0131l\u0131 \u015fekilde konak dokuyla b\u00fct\u00fcnle\u015fti ve kaybolan karaci\u011fer fonksiyonlar\u0131n\u0131 yeniden sa\u011flad\u0131. Bu ba\u015far\u0131, organ ba\u011f\u0131\u015f\u0131n\u0131n k\u0131s\u0131tl\u0131l\u0131\u011f\u0131 ve organlar\u0131n h\u0131zl\u0131 hasat edilip nakledilme zorunlulu\u011fu gibi \u00f6nemli sorunlar\u0131n \u00fcstesinden gelme potansiyeli ta\u015f\u0131yor. Dondurularak saklanan hepatositlerin ihtiya\u00e7 duyuldu\u011funda \u00e7o\u011falt\u0131lmas\u0131, lojistik ve koruma problemlerini a\u015fabilir.<\/p>\n
Ayr\u0131ca, bu y\u00f6ntem rejeneratif t\u0131p alan\u0131nda b\u00fcy\u00fck bir d\u00f6n\u00fcm noktas\u0131 olma potansiyeline sahip. Sato, insan karaci\u011ferinin b\u00fcy\u00fckl\u00fc\u011f\u00fc ve metabolik taleplerini kar\u015f\u0131layacak h\u00fccre say\u0131s\u0131na ula\u015fman\u0131n halen zor oldu\u011funu belirtse de, bu zorluk a\u015f\u0131ld\u0131\u011f\u0131nda, karaci\u011fer nakillerinde k\u00f6kl\u00fc bir devrim yarat\u0131labilir. B\u00f6ylece son evre karaci\u011fer hastal\u0131\u011f\u0131 ve genetik karaci\u011fer bozuklu\u011fu olan hastalar i\u00e7in yeni ya\u015fam umutlar\u0131 do\u011fabilir.<\/p>\n
Organeller, ila\u00e7 geli\u015ftirme s\u00fcrecinde de \u00f6nemli avantajlar sa\u011fl\u0131yor. Geleneksel toksisite testlerinde insan hepatositleri h\u0131zl\u0131 fonksiyon kayb\u0131 ve batchler aras\u0131 farkl\u0131l\u0131k nedeniyle g\u00fcvenilirlikten uzak kal\u0131yordu. Bu da hem s\u00fcreci uzat\u0131yor hem de maliyetleri art\u0131r\u0131yordu. Organoidler ise yenilenebilir ve metabolik a\u00e7\u0131dan aktif insan karaci\u011fer h\u00fccrelerinin s\u00fcrekli tedarik edilmesine olanak vererek ila\u00e7 testlerinin g\u00fcvenilirli\u011fini artt\u0131r\u0131yor.<\/p>\n
Hastal\u0131kl\u0131 modellerde de organoidler b\u00fcy\u00fck avantajlar sunuyor. \u00d6rne\u011fin, metabolik ili\u015fkili steatozlu karaci\u011fer hastal\u0131\u011f\u0131 (MASLD) modellemede, lipidler do\u011fal olarak sentezlenirken, hastal\u0131\u011fa y\u00f6nelik ila\u00e7lar uyguland\u0131\u011f\u0131nda bu lipidler azald\u0131. Bu yakla\u015f\u0131m, yapay lipid y\u00fcklemesi yapan \u00f6nceki \u00e7al\u0131\u015fmalara k\u0131yasla daha ger\u00e7ek\u00e7i ve i\u015flevsel bir model sunuyor. Ayr\u0131ca gen d\u00fczenleme teknikleri kullan\u0131larak \u00fcre d\u00f6ng\u00fcs\u00fc bozuklu\u011fu olarak bilinen nadir bir genetik hastal\u0131k olan ornithine transcarbamylase (OTC) eksikli\u011fi ba\u015far\u0131l\u0131 \u015fekilde taklit edildi.<\/p>\n
Ara\u015ft\u0131rmac\u0131lar, organoidlerde karma\u015f\u0131kl\u0131\u011f\u0131n art\u0131r\u0131lmas\u0131 gerekti\u011fini vurguluyor. Karaci\u011ferdeki di\u011fer h\u00fccre pop\u00fclasyonlar\u0131 olan Kupffer h\u00fccreleri (makrofajlar), karaci\u011fer sin\u00fczoidal endotelyal h\u00fccreleri ve hepatic stellate h\u00fccrelerinin eklenmesi, organoidlerin karaci\u011fer fizyolojisindeki h\u00fccresel etkile\u015fimleri tam anlam\u0131yla yans\u0131tmas\u0131 a\u00e7\u0131s\u0131ndan kritik \u00f6nemde. Ayr\u0131ca, klinik uygulamalarda gerekli b\u00fcy\u00fck h\u00fccre miktar\u0131na ula\u015fmak i\u00e7in \u00e7o\u011falma kapasitesinin artt\u0131r\u0131lmas\u0131 da \u00f6nemli \u00f6ncelikler aras\u0131nda.<\/p>\n
Sonu\u00e7 olarak, Keio \u00dcniversitesi\u2019nin insan yeti\u015fkin hepatositlerinden olu\u015fturdu\u011fu metabolik fonksiyonlara sahip organoidler, laboratuvar ortam\u0131nda karaci\u011ferin karma\u015f\u0131k yap\u0131s\u0131n\u0131 ve i\u015flevlerini taklit etme yolunda \u00f6nemli bir kilometre ta\u015f\u0131d\u0131r. Sitokin sinyal yolaklar\u0131n\u0131n yenilik\u00e7i kullan\u0131m\u0131, avanzada farkl\u0131la\u015fma protokolleri ve hassas genetik d\u00fczenleme teknikleri, ki\u015fiye \u00f6zel t\u0131ptan ila\u00e7 ke\u015ffine, rejeneratif tedavilerden hastal\u0131k modellemesine kadar geni\u015f bir yelpazede b\u00fcy\u00fck potansiyel ta\u015f\u0131maktad\u0131r. K\u00fcresel sa\u011fl\u0131k a\u00e7\u0131s\u0131ndan kritik \u00f6nemi olan karaci\u011fer hastal\u0131klar\u0131na kar\u015f\u0131 geli\u015ftirilen bu modeller, temel bilim ve uygulamal\u0131 t\u0131p alan\u0131nda vazge\u00e7ilmez ara\u00e7lar olma yolunda h\u0131zla ilerlemektedir.<\/p>\n
Ara\u015ft\u0131rma Konusu<\/strong>: Cells \u0130nsan karaci\u011ferinin karma\u015f\u0131k biyolojisi ve metabolik fonksiyonlar\u0131n\u0131 laboratuvar ortam\u0131nda yeniden olu\u015fturmak, hepatoloji ve doku m\u00fchendisli\u011finde y\u0131llard\u0131r a\u015f\u0131lmas\u0131 g\u00fc\u00e7 bir engeldi. Bu zorluklar\u0131n \u00fcstesinden gelerek, Keio \u00dcniversitesi ara\u015ft\u0131rmac\u0131lar\u0131 insan yeti\u015fkin hepatositlerinden olu\u015fan organoidler geli\u015ftirmeyi ba\u015fard\u0131. Bu \u00fc\u00e7 boyutlu mini karaci\u011fer modelleri, \u00f6nceki \u00e7al\u0131\u015fmalarda m\u00fcmk\u00fcn olmayan olgun metabolik aktivite g\u00f6sterebilme \u00f6zelli\u011fine sahip olarak karaci\u011fer biyolojisi \u00e7al\u0131\u015fmalar\u0131nda \u00e7\u0131\u011f\u0131r…<\/p>\n","protected":false},"author":1,"featured_media":2843,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_yoast_wpseo_focuskw":"","rank_math_title":"","rank_math_description":"","rank_math_focus_keyword":"","_wpan_schema_json_ld":"","_wpan_ai_seo_metadata":"","_wpan_ai_seo_status":"","_wpan_ai_seo_policy":"","_wpan_ai_seo_faq_block":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[28],"tags":[683,685,682,684,686],"tmauthors":[],"class_list":{"0":"post-2842","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-kanser","8":"tag-insan-hepatositlerinden-uzun-omurlu-karaciger-organoid-kulturu","9":"tag-karaciger-metabolik-fonksiyonlarinin-laboratuvar-ortaminda-yeniden-olusturulmasi","10":"tag-mini-karaciger-organoid-modelleri","11":"tag-onkostatin-m-ile-hizli-hepatosit-proliferasyonu","12":"tag-rejeneratif-tipta-karaciger-organoid-uygulamalari"},"jetpack_featured_media_url":"https:\/\/haber360.com\/wp-content\/uploads\/2025\/04\/Arastirmacilardan-Hizli-Buyuyen-Mini-Karaciger-Modelleri-1744831761.jpg","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/haber360.com\/index.php\/wp-json\/wp\/v2\/posts\/2842","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/haber360.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/haber360.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/haber360.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/haber360.com\/index.php\/wp-json\/wp\/v2\/comments?post=2842"}],"version-history":[{"count":0,"href":"https:\/\/haber360.com\/index.php\/wp-json\/wp\/v2\/posts\/2842\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/haber360.com\/index.php\/wp-json\/wp\/v2\/media\/2843"}],"wp:attachment":[{"href":"https:\/\/haber360.com\/index.php\/wp-json\/wp\/v2\/media?parent=2842"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/haber360.com\/index.php\/wp-json\/wp\/v2\/categories?post=2842"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/haber360.com\/index.php\/wp-json\/wp\/v2\/tags?post=2842"},{"taxonomy":"tmauthors","embeddable":true,"href":"https:\/\/haber360.com\/index.php\/wp-json\/wp\/v2\/tmauthors?post=2842"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nMakale Ba\u015fl\u0131\u011f\u0131<\/strong>: Generation of human adult hepatocyte organoids with metabolic functions
\nHaberin Yay\u0131n Tarihi<\/strong>: April 16, 2025
\nWeb References<\/strong>: http:\/\/dx.doi.org\/10.1038\/s41586-025-08861-y
\nResim Credits<\/strong>: Toshiro Sato from Keio University
\nAnahtar Kelimeler<\/strong>: hepatocyte organoids, liver regeneration, oncostatin M, organoid proliferation, metabolic functions, liver disease modeling, MASLD, gene editing, urea cycle disorder, transplantation, regenerative medicine<\/p>\n","protected":false},"excerpt":{"rendered":"