癌細胞經常被描繪為極度嗜糖。的而且確,大部份的癌細胞對比同等類型的正常細胞均會攝取更多的糖份。323Please respect copyright.PENANAyHsTUUnRLb
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箇中的原因至少有三:323Please respect copyright.PENANAXPNOOWYaY8
1.致癌基因的表達率增加323Please respect copyright.PENANAG3C8euFiCG
2.新陳代謝酶素變異323Please respect copyright.PENANA7vrHSGKWz0
3.周遭環境缺乏氧氣323Please respect copyright.PENANAJ8dZs5A8pF
323Please respect copyright.PENANAUGht9YDuhb
(圖2)沒有氧氣的話,脂肪及氨基酸並不能轉化成為可供細胞所用的能源。323Please respect copyright.PENANAvw6pHJ9yDX
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然而,糖份在擁有氧氣或缺乏氧氣的情況下,均可轉化成為能源。323Please respect copyright.PENANAGgxJ9oz808
因此,當癌細胞處於缺氧狀態的時候,便會增加對糖份的依賴。323Please respect copyright.PENANAJa17xNhiva
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(圖3)正常的細胞有著一套完善的機制控制著其生長速度,而這些機制大多數時候均會在癌細胞發發生的基因變異影響下作廢,促使癌細胞能夠無止境地生長及繁殖。323Please respect copyright.PENANAxPUo8pEvD7
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當一個細胞需要繁殖的時候,細胞膜以及DNA是不可或缺的元件。323Please respect copyright.PENANA6C0q6mFbJE
而在糖份分解的過程中,所涉及的代謝物均能參與細胞膜和DNA的製作。323Please respect copyright.PENANAdWr9AKJ8iy
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亦即是說,癌細胞不斷無止境地生長,導致內部位置沒有足夠氧氣,正好更能觸發更多糖份的攝取,繼續製作繁殖所需的細胞組件。323Please respect copyright.PENANAmcsnTKJ1t0
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但是,若氧氣沒能抵達癌細胞的話,那又如何能夠獲取營養呢?323Please respect copyright.PENANAwiClYYmU3v
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其中的一種渠道,就是從鄰近死去的細胞獲取。323Please respect copyright.PENANAmvO2DDuS46
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詳見可閱:323Please respect copyright.PENANATAo1Gva1GI
三十秒科學–化療效果參差的其中一道原因323Please respect copyright.PENANA9f1z782LIw
- 分享自 LIHKG 討論區323Please respect copyright.PENANANfm1SgV27D
https://lih.kg/2378848323Please respect copyright.PENANAHYf2HwW0fZ
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正因如此,腫瘤的核心大多是已死去的細胞,而其外部則是不斷繁殖的細胞。323Please respect copyright.PENANAUDbT4kbcdL
而經過一段時間的繁殖後,早前的「外部」細胞便成為「核心」,成為鄰近細胞的糧食。323Please respect copyright.PENANAcMBRzvoGY7
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日復如此,腫瘤亦得以無止境助大。323Please respect copyright.PENANAcwUsBOa5kz
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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。323Please respect copyright.PENANAT0ugVq0nMZ
323Please respect copyright.PENANA8hhjt4eLAx
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/toc323Please respect copyright.PENANAtZeKGEQlaX
323Please respect copyright.PENANAnMavN0zTf2
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。323Please respect copyright.PENANApYLpD2qv3M
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Link:323Please respect copyright.PENANAJ66sy6kqLF
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio323Please respect copyright.PENANAaZxhsq2pwf
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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。323Please respect copyright.PENANA0cxlpZxDN0
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科普專欄–薯不揀單
Author:
薯仔聞茱莉
ISSUE #162
三十秒科學–癌細胞嗜糖的原因
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