科普專欄–薯不揀單 - 三十秒科學–癌細胞嗜糖的原因

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。661Please respect copyright.ＰＥＮＡＮＡrlWBZf4YQ5
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箇中的原因至少有三:661Please respect copyright.ＰＥＮＡＮＡLW7fYEtH3x
1.致癌基因的表達率增加661Please respect copyright.ＰＥＮＡＮＡJnhBXVhRD6
2.新陳代謝酶素變異661Please respect copyright.ＰＥＮＡＮＡVe8WKxRVc6
3.周遭環境缺乏氧氣661Please respect copyright.ＰＥＮＡＮＡE3LCdGGJXq
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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。661Please respect copyright.ＰＥＮＡＮＡHTUqrtfMnl
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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。661Please respect copyright.ＰＥＮＡＮＡopvQbcDAwC
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。661Please respect copyright.ＰＥＮＡＮＡDtwjMOckeC
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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。661Please respect copyright.ＰＥＮＡＮＡpdGFYITMM0
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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。661Please respect copyright.ＰＥＮＡＮＡg4MPqDwbAo
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。661Please respect copyright.ＰＥＮＡＮＡ2Mj9QfsxPi
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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。661Please respect copyright.ＰＥＮＡＮＡpF4WGmestv
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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？661Please respect copyright.ＰＥＮＡＮＡ7F9VcB3fRo
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其中的一種渠道，就是從鄰近死去的細胞獲取。661Please respect copyright.ＰＥＮＡＮＡUqxnn7Y9D9
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詳見可閱：661Please respect copyright.ＰＥＮＡＮＡPMI5MdsBiH
三十秒科學–化療效果參差的其中一道原因661Please respect copyright.ＰＥＮＡＮＡy9BzLG4m7j
- 分享自 LIHKG 討論區661Please respect copyright.ＰＥＮＡＮＡvVI4u5fERM
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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。661Please respect copyright.ＰＥＮＡＮＡfzZ9OqOfXg
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。661Please respect copyright.ＰＥＮＡＮＡvvlhSODpEf
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日復如此，腫瘤亦得以無止境助大。661Please respect copyright.ＰＥＮＡＮＡYeX7s9Hxth
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