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。355Please respect copyright.PENANAP3Aske0GN3355Please respect copyright.PENANAzjc7OT9JkL
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箇中的原因至少有三:355Please respect copyright.PENANA6rMZkOyXsO
1.致癌基因的表達率增加355Please respect copyright.PENANAoxVvneA8rz
2.新陳代謝酶素變異355Please respect copyright.PENANAj01q6YyJx9
3.周遭環境缺乏氧氣355Please respect copyright.PENANAv1Dx1dcYDE
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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。355Please respect copyright.PENANAM0Htq7uQld355Please respect copyright.PENANA7dS7GZaisA
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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。355Please respect copyright.PENANAHcM9M8PVIx
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。355Please respect copyright.PENANAQq4etuJCiq
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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。355Please respect copyright.PENANAFASC72RjZb355Please respect copyright.PENANAzaFjbVXG78
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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。355Please respect copyright.PENANASL4A7vHPWz
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。355Please respect copyright.PENANAgnlTZxgwHp
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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。355Please respect copyright.PENANAzSN1uJ0zlK
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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?355Please respect copyright.PENANAxla7DAZ5Bv
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其中的一種渠道,就是從鄰近死去的細胞獲取。355Please respect copyright.PENANAZx73h0kLT7
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詳見可閱:355Please respect copyright.PENANAR74T0ATz3U
三十秒科學–化療效果參差的其中一道原因355Please respect copyright.PENANASaFpMxeoCt
- 分享自 LIHKG 討論區355Please respect copyright.PENANACIe2j3AsQv
https://lih.kg/2378848355Please respect copyright.PENANAJbFh7SN1R2
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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。355Please respect copyright.PENANA16ScOMhSjl
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。355Please respect copyright.PENANA0PC5JvuicU
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日復如此,腫瘤亦得以無止境助大。355Please respect copyright.PENANA8nulRJm4f5
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