其中一道腫瘤形成的理論,就是經過無數基因異變的洗滌下,有助癌細胞生長的基因(Oncogene)不斷產生出來對它們有利的蛋白質,而負責抑制癌細胞生長的基因(Tumor Suppressor)則失去功用,沒能產生出制衝它們的蛋白質。343Please respect copyright.PENANAx5wlb3DLlv
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在製藥角度來看,對付Oncogene常理上較為合理,畢竟抑制事物比起激發事物會來得更為容易。343Please respect copyright.PENANAHCxMpi5GnO
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(圖2)P53蛋白質是其中一隻Tumor Suppressor,它最常見的變異版本就R175H,意思是它的第175個氨基酸發生了異變。343Please respect copyright.PENANAlQv41QIvcW
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P53蛋白質延伸閱讀:343Please respect copyright.PENANAohi2l5I13x
分半鐘科學–缺氧對癌細胞的好處343Please respect copyright.PENANAnvaggacL78
https://lih.kg/2420256343Please respect copyright.PENANANjHPWG5q5q
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雖然P53蛋白質主要是位於細胞內部,但當中會有一小節的蛋白質會表達在細胞表面上,名為新生抗原(Neoantigen),數量極為稀少,可以少至1顆細胞只有10塊表達在其表面上。343Please respect copyright.PENANA89Kkvlq6ZN
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現時有科學家開始從針對Tumor Suppressor入手,製作出「雙面人」抗體(Bispecific antibodies),一面辨認癌細胞的新生抗原,另一面則會辨認免疫細胞T cell,目的就是希望透過雙面人抗體拉近免疫細胞與癌細胞的距離,促使免疫細胞更有效率地對癌細胞進行皇天擊殺。343Please respect copyright.PENANAb8hTMFYyHT
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(圖3)對老鼠注射平均表面每顆平均只有2塊變種版本新生抗原的癌細胞,七日後可從螢光技術見得到腫瘤有著增大的趨勢。343Please respect copyright.PENANAnYZZiZC8KX
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而注射能辨認P53蛋白質R175H變種的雙面人抗體後,腫瘤體積顯著有所減少。343Please respect copyright.PENANAKUPA3ZHvMy
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這技術的好處是能夠針對殺滅擁有特定變異基因的癌細胞,但基於每顆癌細胞的變異位置及程度均有所不同,要活用這技術的話便必須要獲取該病人的癌細胞基因變異狀況。343Please respect copyright.PENANAkbmlLL9htI
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螢光技術延伸閱讀:343Please respect copyright.PENANAJhGMo8A4RK
三十秒科學–透視癌細胞343Please respect copyright.PENANAp3CbLdlZS1
https://lih.kg/2408323343Please respect copyright.PENANAVm7zPChR7B
343Please respect copyright.PENANAzOeqvmOJPK
如果想我快啲出文的話,請入去Penana網站科普專欄–薯不揀單俾一個like以及Bookmark,這對我非常之重要。343Please respect copyright.PENANA8P82qkLGlo
343Please respect copyright.PENANAxxhLir1MrB
Link: https://www.penana.com/story/66244/%E7%A7%91%E6%99%AE%E5%B0%88%E6%AC%84-%E8%96%AF%E4%B8%8D%E6%8F%80%E5%96%AE/toc343Please respect copyright.PENANAUrdAhSdu2R
343Please respect copyright.PENANAFetf8TtjVo
同時亦可以在Penana網站裡按「買一嚿/半嚿薯仔」,以課金的方式推動我繼續搜羅資料寫文,多謝。343Please respect copyright.PENANA6AYxLFDMgM
343Please respect copyright.PENANAGfrNRXMNLX
Link:343Please respect copyright.PENANAxZWeTSPBL4
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio343Please respect copyright.PENANAyJxVO5m2cD
343Please respect copyright.PENANArJKPmnVgpW
343Please respect copyright.PENANAgXoOTQEerN
除非Facebook及IG重開侵侵的account,否則我的IG將不會再作更新,只會寄居本土LIHKG及Penana。343Please respect copyright.PENANAjb62MSsINw
343Please respect copyright.PENANAeKnSC8la7g
Ref1:https://science.sciencemag.org/content/early/2021/02/26/science.abc8697343Please respect copyright.PENANAYNCxXA3gCt
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科普專欄–薯不揀單
Author:
薯仔聞茱莉
ISSUE #169
三十秒科學–雙面人抗體
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