Kanser tedavisinde b\u00fcy\u00fck molek\u00fcll\u00fc ila\u00e7lar\u0131n h\u00fccre i\u00e7ine al\u0131m\u0131nda ya\u015fanan engeller, yeni bir bilimsel bulu\u015fla a\u015f\u0131lma noktas\u0131na geldi. Duke \u00dcniversitesi T\u0131p Fak\u00fcltesi, Teksas \u00dcniversitesi Sa\u011fl\u0131k Bilimleri Merkezi ve Arkansas \u00dcniversitesi\u2019nin i\u015f birli\u011fiyle y\u00fcr\u00fct\u00fclen ara\u015ft\u0131rmada, proteoliz hedefleyici kimyasal birle\u015ftiriciler (PROTAC\u2019ler) adl\u0131 molek\u00fcllerin h\u00fccre i\u00e7ine giri\u015fini dramatik bi\u00e7imde art\u0131ran bir y\u00f6ntem geli\u015ftirildi. PROTAC\u2019ler, karma\u015f\u0131k yap\u0131lar\u0131 ve y\u00fcksek molek\u00fcl a\u011f\u0131rl\u0131klar\u0131 nedeniyle \u00e7o\u011funlukla h\u00fccre zar\u0131n\u0131 ge\u00e7mekte zorlan\u0131rken, bu yeni y\u00f6ntemle etkinliklerinde ciddi art\u0131\u015f sa\u011fland\u0131 ve kanser tedavilerinde \u00e7\u0131\u011f\u0131r a\u00e7abilecek bir potansiyel ortaya \u00e7\u0131kt\u0131.<\/p>\n
Geleneksel ila\u00e7 tasar\u0131m\u0131, molek\u00fcllerin h\u00fccre zar\u0131ndan pasif olarak ge\u00e7i\u015fine dayan\u0131r ve genellikle Lipinski\u2019nin \u2018Rule of 5\u2019 kurallar\u0131 kapsam\u0131nda 500 Dalton\u2019u a\u015fmayan molek\u00fcller tercih edilir. Ancak PROTAC\u2019ler tipik olarak 1.000 Dalton\u2019un \u00fczerindedir ve bu da onlar\u0131n biyoyararlan\u0131m\u0131n\u0131 b\u00fcy\u00fck \u00f6l\u00e7\u00fcde s\u0131n\u0131rland\u0131r\u0131r. Yeni geli\u015ftirilen teknik, \u00f6zellikle CD36 adl\u0131 do\u011fal bir protein resept\u00f6r\u00fcn\u00fc hedef al\u0131yor. CD36, ba\u011f\u0131rsak, deri, akci\u011ferler, g\u00f6zler ve baz\u0131 beyin h\u00fccreleri y\u00fczeyinde bol miktarda bulunan ve endositoz yoluyla molek\u00fclleri i\u00e7eri alan bir resept\u00f6r olarak i\u015flev g\u00f6r\u00fcr.<\/p>\n
Ara\u015ft\u0131rmac\u0131lar, PROTAC molek\u00fcllerini kimyasal olarak modifiye ederek CD36 resept\u00f6r\u00fcne aktiv bi\u00e7imde ba\u011flanmas\u0131n\u0131 sa\u011flad\u0131lar. Bu yenilik\u00e7i yakla\u015f\u0131m \u201ckimyasal endositoz t\u0131bbi kimyas\u0131\u201d (Chemical Endocytic Medicinal Chemistry – CEMC) olarak adland\u0131r\u0131ld\u0131. B\u00f6ylece molek\u00fcller, pasif dif\u00fczyonun s\u0131n\u0131rlar\u0131n\u0131 a\u015farak h\u00fccrenin do\u011fal madde alma mekanizmas\u0131n\u0131 kullan\u0131r hale getirildi. Kanser h\u00fccrelerinde yap\u0131lan deneylerde, CD36 arac\u0131l\u0131 ilac\u0131n h\u00fccre i\u00e7i konsantrasyonunun 7.7 ila 22.3 kat artt\u0131\u011f\u0131; bunun da terap\u00f6tik etkinlikte 23 katl\u0131k bir art\u0131\u015fa yol a\u00e7t\u0131\u011f\u0131 g\u00f6zlemlendi.<\/p>\n
Fare modellerinde yap\u0131lan \u00e7al\u0131\u015fmalarda, hem molek\u00fcl\u00fcn h\u00fccre i\u00e7ine al\u0131m\u0131 hem de t\u00fcm\u00f6r b\u00fcy\u00fcmesinin bask\u0131lanmas\u0131 \u00f6nemli oranda iyile\u015firken, ilac\u0131n \u00e7\u00f6z\u00fcn\u00fcrl\u00fc\u011f\u00fc ve kararl\u0131l\u0131\u011f\u0131 gibi klinik uygulama i\u00e7in kritik \u00f6zelliklerin bozulmad\u0131\u011f\u0131 g\u00f6r\u00fcld\u00fc. Bu \u00f6nemli geli\u015fme, daha \u00f6nce h\u00fccre i\u00e7i hedeflere ula\u015f\u0131m\u0131n art\u0131r\u0131lmas\u0131 i\u00e7in yap\u0131lan modifikasyonlar\u0131n molek\u00fcl stabilitesini azalt\u0131yaca\u011f\u0131 endi\u015fesini ortadan kald\u0131rd\u0131. CEMC teknolojisi, b\u00fcy\u00fck molek\u00fcll\u00fc ila\u00e7lar\u0131n yap\u0131s\u0131n\u0131 de\u011fi\u015ftirmeden h\u00fccre i\u00e7inde etkin olduklar\u0131 hedeflere ula\u015ft\u0131rabilme olana\u011f\u0131 sa\u011flad\u0131.<\/p>\n
Bu yenilik, \u00f6zellikle geleneksel \u2018Rule of 5\u2019 s\u0131n\u0131rlar\u0131n\u0131 a\u015fan bRo5 molek\u00fcl s\u0131n\u0131f\u0131 i\u00e7in b\u00fcy\u00fck \u00f6nem ta\u015f\u0131yor. PROTAC\u2019ler, kanser tedavisinde \u00f6zg\u00fcn bir bak\u0131\u015f a\u00e7\u0131s\u0131 sunan, hastal\u0131\u011fa yol a\u00e7an proteinleri enzimlerin i\u015flevlerini sadece engellemekle kalmay\u0131p, do\u011frudan hedef al\u0131p yok eden molek\u00fcllerdir. Kanser h\u00fccrelerinde geli\u015fen diren\u00e7 mekanizmalar\u0131n\u0131n \u00e7o\u011fu enzim inhibit\u00f6rlerinin etkisini ortadan kald\u0131rmaya y\u00f6neliktir; ancak proteinlerin tamamen par\u00e7alanmas\u0131n\u0131 sa\u011flayan PROTAC\u2019ler, bu diren\u00e7lerin a\u015f\u0131lmas\u0131nda b\u00fcy\u00fck bir avantaja sahip.<\/p>\n
CD36 arac\u0131l\u0131 endositozun kanser d\u0131\u015f\u0131ndaki hastal\u0131k alanlar\u0131na da uygulanabilirli\u011fi bulunuyor. \u015eimdilik Parkinson hastal\u0131\u011f\u0131 gibi n\u00f6rodejeneratif hastal\u0131klar ve kanser tedavisi oda\u011f\u0131ndaki PROTAC molek\u00fclleri \u00fczerinde durulsa da, bu y\u00f6ntem b\u00fcy\u00fck ve yap\u0131sal olarak karma\u015f\u0131k molek\u00fcllerin h\u00fccre i\u00e7ine etkin bi\u00e7imde al\u0131nabilmesini m\u00fcmk\u00fcn k\u0131larak, protein ekspresyonunu veya fonksiyonunu h\u00fccre i\u00e7inde de\u011fi\u015ftirmeyi hedefleyen pek \u00e7ok ilac\u0131n geli\u015ftirilmesini h\u0131zland\u0131rabilir.<\/p>\n
Ara\u015ft\u0131rmay\u0131 y\u00f6neten Teksas \u00dcniversitesi\u2019nden Dr. Hong-yu Li, bu bulu\u015fun ila\u00e7lar\u0131n h\u00fccre i\u00e7ine al\u0131nmas\u0131 konusundaki paradigma de\u011fi\u015fimini simgeledi\u011fini belirtti. Daha \u00f6nce bu b\u00fcy\u00fckl\u00fckteki molek\u00fcllerin h\u00fccre zar\u0131ndan ge\u00e7i\u015fi pasif dif\u00fczyona ba\u011fl\u0131 olarak s\u0131n\u0131rland\u0131r\u0131lm\u0131\u015f ve resept\u00f6r arac\u0131l\u0131 endositoz y\u00f6ntemleri ise kimyasal olarak tasarlanm\u0131\u015f ila\u00e7 molek\u00fcllerinde yeterince ke\u015ffedilmemi\u015fti. CD36\u2019n\u0131n bir hedef olarak tan\u0131mlanmas\u0131, kimyasal molek\u00fcllerden yararlan\u0131larak ila\u00e7lar\u0131n hedeflenmi\u015f ve etkin bi\u00e7imde h\u00fccre i\u00e7ine al\u0131nabilece\u011fi yeni bir alan a\u00e7t\u0131.<\/p>\n
Ara\u015ft\u0131rman\u0131n g\u00fcvenilirli\u011fini peki\u015ftiren bir di\u011fer unsur ise Arkansas \u00dcniversitesi\u2019nden Dr. Zhiqiang Qin ve ekibinin proje \u00fczerindeki ba\u011f\u0131ms\u0131z do\u011frulamalar\u0131d\u0131r. \u0130\u015f birli\u011fi i\u00e7inde yap\u0131lan deneyler, ayn\u0131 stratejinin tekrarlanabilir \u015fekilde etkili sonu\u00e7lar verdi\u011fini ortaya koydu. Bu da klinik uygulama a\u015famas\u0131na daha sa\u011flam bir alt yap\u0131 sa\u011flamakta ve bu y\u00f6ntemin ila\u00e7 geli\u015ftirme s\u00fcre\u00e7lerinde g\u00fcvenle kullan\u0131labilece\u011fini g\u00f6stermektedir.<\/p>\n
Her ne kadar elde edilen veriler umut verici olsa da, ara\u015ft\u0131rmac\u0131lar CD36 \u00fczerinden ilac\u0131n h\u00fccre i\u00e7ine al\u0131nmas\u0131 y\u00f6nteminin klinik kullan\u0131ma ge\u00e7meden \u00f6nce insanlarda ciddi klinik deneylerle test edilmesi gerekti\u011finin alt\u0131n\u0131 \u00e7iziyorlar. Bu a\u015famalarda g\u00fcvenlik, ilac\u0131n v\u00fccuttaki da\u011f\u0131l\u0131m\u0131 ve etkisi, CD36 resept\u00f6r\u00fcn\u00fcn ba\u015fka v\u00fccut b\u00f6lgelerine olas\u0131 yan etkileri ve ba\u011f\u0131\u015f\u0131kl\u0131k sistemi tepkileri detayl\u0131ca incelenecek. Bunlar\u0131n sa\u011fl\u0131kl\u0131 \u015fekilde raporlanmas\u0131, y\u00f6ntemin yayg\u0131n \u015fekilde ve g\u00fcvenle kullan\u0131lmas\u0131n\u0131n \u00f6n\u00fcn\u00fc a\u00e7acak.<\/p>\n
\u00d6te yandan bu geli\u015fme, ila\u00e7 tasar\u0131m paradigmas\u0131n\u0131 pasif molek\u00fcl optimizasyonundan \u00e7\u0131kar\u0131p h\u00fccrelerin biyolojik \u00f6zelliklerini aktif olarak kullanmaya y\u00f6nlendiriyor. B\u00f6ylece ilgin\u00e7 ve karma\u015f\u0131k molek\u00fcl yap\u0131lar\u0131, art\u0131k engel de\u011fil, receptor-ba\u011flanmas\u0131n\u0131 g\u00fc\u00e7lendiren birer avantaj haline geliyor. Bu yeni yakla\u015f\u0131m, biyolojik sistemlerin detayl\u0131 bilgisiyle donanm\u0131\u015f bir ila\u00e7 geli\u015ftirme \u00e7a\u011f\u0131n\u0131n ba\u015flang\u0131c\u0131n\u0131 simgeliyor.<\/p>\n
Konvansiyonel kanser tedavileri genellikle kinaz inhibit\u00f6rleri gibi spesifik enzim aktivitesini engelleyen ila\u00e7lar bar\u0131nd\u0131r\u0131r ancak bu ila\u00e7lar hedef proteinleri yok etmez, sadece i\u015flevlerini durdurur. Arta kalan proteinler hastal\u0131k ilerlemesini ve tedavi direncini s\u00fcrd\u00fcrebilir. PROTAC molek\u00fclleri ise hastal\u0131\u011fa yol a\u00e7an proteinleri tamamen par\u00e7alay\u0131p h\u00fccre ortam\u0131ndan uzakla\u015ft\u0131rarak \u00e7ok daha etkili ve kal\u0131c\u0131 tedavi sa\u011flar. CD36 ile ila\u00e7lar\u0131n daha fazla h\u00fccre i\u00e7ine girmesi, bu tedavi prensibinin ba\u015far\u0131s\u0131n\u0131 katbekat art\u0131r\u0131yor.<\/p>\n
Halen a\u011f\u0131z yoluyla al\u0131nan sekiz farkl\u0131 PROTAC aday\u0131 klinik deneylerde bulunuyor. Bunlar\u0131n aras\u0131nda meme kanserinde \u00f6strojen resept\u00f6r\u00fcn\u00fc hedef alan ve Faz 3 a\u015famas\u0131nda olan bir ila\u00e7 da var. CD36 resept\u00f6r\u00fcn\u00fc hedef alan bu yeni teknoloji, mevcut ila\u00e7 adaylar\u0131n\u0131n ba\u015far\u0131 oran\u0131n\u0131 y\u00fckseltme ve protein degradasyon tabanl\u0131 ila\u00e7lar\u0131 farkl\u0131 kanser t\u00fcrlerine geni\u015fletme potansiyeline sahip.<\/p>\n
Bu prestijli ara\u015ft\u0131rma, Ulusal Sa\u011fl\u0131k Enstit\u00fcleri (NIH) ve Teksas Kanser \u00d6nleme ve Ara\u015ft\u0131rma Enstit\u00fcs\u00fc (CPRIT) gibi \u00f6nde gelen finansman kurumlar\u0131n\u0131n destekleriyle y\u00fcr\u00fct\u00fclmekte olup, multidisipliner i\u015f birli\u011fi kapsam\u0131nda geli\u015ftirilen ileri nesil kanser tedavisi teknolojilerine i\u015faret etmektedir. Ortaya \u00e7\u0131kan sonu\u00e7lar, onkoloji, ila\u00e7 kimyas\u0131 ve ila\u00e7 ke\u015fif alanlar\u0131nda yeni ufuklar a\u00e7maktad\u0131r.<\/p>\n
Sonu\u00e7 olarak, kimyasal endositoz t\u0131bbi kimyas\u0131 alan\u0131nda sa\u011flanan bu bulu\u015f, molek\u00fcl b\u00fcy\u00fckl\u00fc\u011f\u00fc s\u0131n\u0131rlamalar\u0131n\u0131 y\u0131kan, h\u00fccre i\u00e7ine giri\u015f etkinli\u011fi y\u00fcksek b\u00fcy\u00fck molek\u00fcll\u00fc ila\u00e7lar\u0131n geli\u015ftirilmesini olanakl\u0131 k\u0131lan devrimci bir ad\u0131md\u0131r. Kanser ba\u015fta olmak \u00fczere protein k\u00f6kenli hastal\u0131klar\u0131n tedavisinde yeni tedavi yakla\u015f\u0131mlar\u0131n\u0131 m\u00fcmk\u00fcn k\u0131lacak bu y\u00f6ntem, yak\u0131n gelecekte hasta ya\u015fam kalitesini ve tedavi ba\u015far\u0131s\u0131n\u0131 art\u0131rmada \u00f6nemli bir rol oynayacakt\u0131r.<\/p>\n
—<\/p>\n
Ara\u015ft\u0131rma Konusu<\/strong>: Cells<\/p>\n Makale Ba\u015fl\u0131\u011f\u0131<\/strong>: CD-36-mediated endocytosis of proteolysis-targeting chimeras<\/p>\n Haberin Yay\u0131n Tarihi<\/strong>: April 17, 2025<\/p>\n Web References<\/strong>: https:\/\/doi.org\/10.1016\/j.cell.2025.03.036<\/p>\n Doi Referans<\/strong>: Lin, H.-K., Li, H.-Y., Qin, Z., et al. \u201cCD-36-mediated endocytosis of proteolysis-targeting chimeras,\u201d Cell, April 17, 2025.<\/p>\n Resim Credits<\/strong>: Duke University School of Medicine<\/p>\n Anahtar Kelimeler<\/strong>: Cancer medication, Surface proteins, Drug design, Cancer cells, Drug resistance, Drug therapy<\/p>\n","protected":false},"excerpt":{"rendered":" Kanser tedavisinde b\u00fcy\u00fck molek\u00fcll\u00fc ila\u00e7lar\u0131n h\u00fccre i\u00e7ine al\u0131m\u0131nda ya\u015fanan engeller, yeni bir bilimsel bulu\u015fla a\u015f\u0131lma noktas\u0131na geldi. Duke \u00dcniversitesi T\u0131p Fak\u00fcltesi, Teksas \u00dcniversitesi Sa\u011fl\u0131k Bilimleri Merkezi ve Arkansas \u00dcniversitesi\u2019nin i\u015f birli\u011fiyle y\u00fcr\u00fct\u00fclen ara\u015ft\u0131rmada, proteoliz hedefleyici kimyasal birle\u015ftiriciler (PROTAC\u2019ler) adl\u0131 molek\u00fcllerin h\u00fccre i\u00e7ine giri\u015fini dramatik bi\u00e7imde art\u0131ran bir y\u00f6ntem geli\u015ftirildi. PROTAC\u2019ler, karma\u015f\u0131k yap\u0131lar\u0131 ve y\u00fcksek molek\u00fcl…<\/p>\n","protected":false},"author":1,"featured_media":2991,"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":[1054,1052,1050,1053,1051],"tmauthors":[],"class_list":{"0":"post-2990","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-kanser","8":"tag-buyuk-molekullu-ilaclarin-biyoyararlanimi-artirma-teknikleri","9":"tag-cd36-reseptoru-aracili-hucre-ici-ilac-alimi","10":"tag-kanser-ilaci-hucre-girisi-optimizasyonu","11":"tag-kimyasal-endositoz-tibbi-kimyasi-cemc-yontemi","12":"tag-proteoliz-hedefleyici-kimyasal-birlestiriciler-protac-tasinmasi"},"jetpack_featured_media_url":"https:\/\/haber360.com\/wp-content\/uploads\/2025\/04\/Kanser-Ilaci-Tasinmasinda-Hucre-Girisi-Optimizasyonu-1744904673.jpg","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/haber360.com\/index.php\/wp-json\/wp\/v2\/posts\/2990","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=2990"}],"version-history":[{"count":0,"href":"https:\/\/haber360.com\/index.php\/wp-json\/wp\/v2\/posts\/2990\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/haber360.com\/index.php\/wp-json\/wp\/v2\/media\/2991"}],"wp:attachment":[{"href":"https:\/\/haber360.com\/index.php\/wp-json\/wp\/v2\/media?parent=2990"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/haber360.com\/index.php\/wp-json\/wp\/v2\/categories?post=2990"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/haber360.com\/index.php\/wp-json\/wp\/v2\/tags?post=2990"},{"taxonomy":"tmauthors","embeddable":true,"href":"https:\/\/haber360.com\/index.php\/wp-json\/wp\/v2\/tmauthors?post=2990"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}