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。404Please respect copyright.PENANA7gdeVtn5J0
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箇中的原因至少有三:404Please respect copyright.PENANAelVHGinBw7
1.致癌基因的表達率增加404Please respect copyright.PENANAsWJbazHyIc
2.新陳代謝酶素變異404Please respect copyright.PENANAqD8jmrCvY2
3.周遭環境缺乏氧氣404Please respect copyright.PENANAj84Wkp0Uf8
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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。404Please respect copyright.PENANAAMQXoURtOm
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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。404Please respect copyright.PENANAPKZkXaO6kk
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。404Please respect copyright.PENANAtiBzVVHJl1
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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。404Please respect copyright.PENANA78NSDEi3j1
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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。404Please respect copyright.PENANAHvvyTY49q2
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。404Please respect copyright.PENANA2lqpwcD0a6
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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。404Please respect copyright.PENANA5HfI7Rf1UQ
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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?404Please respect copyright.PENANAbwnVOVgVjR
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其中的一種渠道,就是從鄰近死去的細胞獲取。404Please respect copyright.PENANAbWu6RRvkUG
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詳見可閱:404Please respect copyright.PENANAJG5fk91MGT
三十秒科學–化療效果參差的其中一道原因404Please respect copyright.PENANAyCqFx9tA5G
- 分享自 LIHKG 討論區404Please respect copyright.PENANAoSZ55MQz4C
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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。404Please respect copyright.PENANAQyVHTye8Wx
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。404Please respect copyright.PENANATCcl3gPWSG
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日復如此,腫瘤亦得以無止境助大。404Please respect copyright.PENANAkRBuakMjvr
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