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。345Please respect copyright.PENANAQMeEDf6LP3
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箇中的原因至少有三:345Please respect copyright.PENANAfL8vwK2XIt
1.致癌基因的表達率增加345Please respect copyright.PENANAKDH4J2z3KQ
2.新陳代謝酶素變異345Please respect copyright.PENANA628HmZPsyR
3.周遭環境缺乏氧氣345Please respect copyright.PENANAzAlZo7iba4
345Please respect copyright.PENANALjJ5oAA9fk
(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。345Please respect copyright.PENANAnlKNFnooBe
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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。345Please respect copyright.PENANAW1Wsew97JD
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。345Please respect copyright.PENANAFrWiBt5Zuy
345Please respect copyright.PENANAJ0JOqYTJ3g
(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。345Please respect copyright.PENANA6koIgqDQD3
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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。345Please respect copyright.PENANATtQZIzEOns
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。345Please respect copyright.PENANAVuod3nFNzJ
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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。345Please respect copyright.PENANAmqgO1hKebP
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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?345Please respect copyright.PENANAxSUnzdsucB
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其中的一種渠道,就是從鄰近死去的細胞獲取。345Please respect copyright.PENANA2IpUNs6ePD
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詳見可閱:345Please respect copyright.PENANA8vzSh2f7Li
三十秒科學–化療效果參差的其中一道原因345Please respect copyright.PENANAFgPEidzjsN
- 分享自 LIHKG 討論區345Please respect copyright.PENANApEKDQv4ClC
https://lih.kg/2378848345Please respect copyright.PENANAvrmzn9Is6a
345Please respect copyright.PENANABHLd5uDcnN
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。345Please respect copyright.PENANAa7XOtrauN1
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。345Please respect copyright.PENANA8z95ldizqx
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日復如此,腫瘤亦得以無止境助大。345Please respect copyright.PENANAG9rfZFlofR
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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。345Please respect copyright.PENANAWyPazPIlVG
345Please respect copyright.PENANAVHYo70a9jF
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/toc345Please respect copyright.PENANATAQ6AJgQPI
345Please respect copyright.PENANAHlx3ZFI979
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。345Please respect copyright.PENANArX4PBI0HoT
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Link:345Please respect copyright.PENANApKVjFJVqyx
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio345Please respect copyright.PENANAChyH7S9SK8
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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。345Please respect copyright.PENANA8a6PFqZwlu
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科普專欄–薯不揀單
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薯仔聞茱莉
篇 #162
三十秒科學–癌細胞嗜糖的原因
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