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。673Please respect copyright.ＰＥＮＡＮＡuQFeZCBB4q
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箇中的原因至少有三:673Please respect copyright.ＰＥＮＡＮＡxHgtP2I59c
1.致癌基因的表達率增加673Please respect copyright.ＰＥＮＡＮＡrtKg6YooAX
2.新陳代謝酶素變異673Please respect copyright.ＰＥＮＡＮＡW4PrnrYJTc
3.周遭環境缺乏氧氣673Please respect copyright.ＰＥＮＡＮＡTzGV5X6zlq
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（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。673Please respect copyright.ＰＥＮＡＮＡB23IKCFFQ1
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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。673Please respect copyright.ＰＥＮＡＮＡEPF5M8gvBU
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。673Please respect copyright.ＰＥＮＡＮＡdCLku0EAAm
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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。673Please respect copyright.ＰＥＮＡＮＡyMT88lztV4
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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。673Please respect copyright.ＰＥＮＡＮＡeSF83p95eZ
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。673Please respect copyright.ＰＥＮＡＮＡYVhfQKuoIa
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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。673Please respect copyright.ＰＥＮＡＮＡCTigXuvpzL
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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？673Please respect copyright.ＰＥＮＡＮＡKz8otnEO3Q
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其中的一種渠道，就是從鄰近死去的細胞獲取。673Please respect copyright.ＰＥＮＡＮＡ3pyurhSlSd
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詳見可閱：673Please respect copyright.ＰＥＮＡＮＡiQEsPpfHRi
三十秒科學–化療效果參差的其中一道原因673Please respect copyright.ＰＥＮＡＮＡk1WBiXJEdN
- 分享自 LIHKG 討論區673Please respect copyright.ＰＥＮＡＮＡuCvwBLjtpZ
https://lih.kg/2378848673Please respect copyright.ＰＥＮＡＮＡNGXqiPsm45
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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。673Please respect copyright.ＰＥＮＡＮＡxchNlKBR4R
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。673Please respect copyright.ＰＥＮＡＮＡekjj2kGG4n
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日復如此，腫瘤亦得以無止境助大。673Please respect copyright.ＰＥＮＡＮＡtVhMSDZstk
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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。673Please respect copyright.ＰＥＮＡＮＡR12Bk32o9g
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https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio673Please respect copyright.ＰＥＮＡＮＡOJXlgFbjPq
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