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。670Please respect copyright.PENANAsHxDCBs2NV670Please respect copyright.PENANAEXYLQgnVPk
670Please respect copyright.PENANAEXpnqZHCSV
箇中的原因至少有三:670Please respect copyright.PENANAfJYr7oeeQA
1.致癌基因的表達率增加670Please respect copyright.PENANAtpA8CUwS0h
2.新陳代謝酶素變異670Please respect copyright.PENANAtE3PR9qVpY
3.周遭環境缺乏氧氣670Please respect copyright.PENANA7betWzZjA8
670Please respect copyright.PENANA2v6wPDdcN1
(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。670Please respect copyright.PENANAdSco2yJH9y670Please respect copyright.PENANASjNVOqtl7B
670Please respect copyright.PENANArE1wz6kNYL
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。670Please respect copyright.PENANA7Z9LZ150KR
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。670Please respect copyright.PENANA3FniK9tHeX
670Please respect copyright.PENANA5xUOi7Ogfa
(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。670Please respect copyright.PENANAhwuOX4V76X670Please respect copyright.PENANA5VPupyXUeA
670Please respect copyright.PENANA5IP5JBYlab
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。670Please respect copyright.PENANAylE4GwU8gP
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。670Please respect copyright.PENANA3pp9u8C97R
670Please respect copyright.PENANAl8dDtXrKRX
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。670Please respect copyright.PENANAaiEntt56ZS
670Please respect copyright.PENANA6EuoqGhJDF
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?670Please respect copyright.PENANAR2DYmRnO27
670Please respect copyright.PENANAA8jX3sY4b7
其中的一種渠道,就是從鄰近死去的細胞獲取。670Please respect copyright.PENANA0iJGvq4w8i
670Please respect copyright.PENANATTnd0yI57b
詳見可閱:670Please respect copyright.PENANApliE64mt2H
三十秒科學–化療效果參差的其中一道原因670Please respect copyright.PENANAUiBZF2NsDV
- 分享自 LIHKG 討論區670Please respect copyright.PENANAICuXta7Iyj
https://lih.kg/2378848670Please respect copyright.PENANAVuWuoVprah
670Please respect copyright.PENANAodVrJlFgPL
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。670Please respect copyright.PENANAg70Z2FO0YR
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。670Please respect copyright.PENANAUorPxFqrKm
670Please respect copyright.PENANA7hlHk5WOVh
日復如此,腫瘤亦得以無止境助大。670Please respect copyright.PENANAHalYZHLf0l
670Please respect copyright.PENANAGV99wPh7Q4
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。670Please respect copyright.PENANAXkdTLS47sS
670Please respect copyright.PENANAnz0cbJCPX7
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/toc670Please respect copyright.PENANAclPiTV38Mx
670Please respect copyright.PENANAEfwFDDFuY1
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。670Please respect copyright.PENANAXK7pIAr1of
670Please respect copyright.PENANAQ4OwnLNdt9
Link:670Please respect copyright.PENANAcakNKnTiwU
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio670Please respect copyright.PENANAkey7NVjBlt
670Please respect copyright.PENANAeiPbH96v5C
670Please respect copyright.PENANABvOEq2YgVd
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。670Please respect copyright.PENANAxqqhZFL8q5
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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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