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。664Please respect copyright.PENANANd7rhZhunK664Please respect copyright.PENANAycHY3cXYPr
664Please respect copyright.PENANA9josWR4WrD
箇中的原因至少有三:664Please respect copyright.PENANACxHCzj0aKn
1.致癌基因的表達率增加664Please respect copyright.PENANAz1wsneXpkk
2.新陳代謝酶素變異664Please respect copyright.PENANAyHUU407JFk
3.周遭環境缺乏氧氣664Please respect copyright.PENANA00ecNlZuzt
664Please respect copyright.PENANAiJth8oqTi9
(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。664Please respect copyright.PENANAeYc82cBNt4664Please respect copyright.PENANAl7jPvpbmLn
664Please respect copyright.PENANAYB1f0iri4I
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。664Please respect copyright.PENANA9qq8lyEnJd
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。664Please respect copyright.PENANA3rOTSFEu8h
664Please respect copyright.PENANAh0ewwCq4yB
(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。664Please respect copyright.PENANA09EHtcRt3p664Please respect copyright.PENANABKkiD1eglT
664Please respect copyright.PENANAHsGZnRmmoJ
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。664Please respect copyright.PENANAbqxpDBVS5C
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。664Please respect copyright.PENANAznge7RMRUX
664Please respect copyright.PENANASrwsTDV0Eq
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。664Please respect copyright.PENANAxQZVwGuQIL
664Please respect copyright.PENANAoes5VHdqzj
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?664Please respect copyright.PENANAQdOTSLcuBo
664Please respect copyright.PENANAOTSqRS77k7
其中的一種渠道,就是從鄰近死去的細胞獲取。664Please respect copyright.PENANATArZojhMmZ
664Please respect copyright.PENANAnrSz6i1xcS
詳見可閱:664Please respect copyright.PENANAD9P0mvV5pw
三十秒科學–化療效果參差的其中一道原因664Please respect copyright.PENANAraKHYUh4qd
- 分享自 LIHKG 討論區664Please respect copyright.PENANAGnd20PuW3S
https://lih.kg/2378848664Please respect copyright.PENANAv9hH9S425n
664Please respect copyright.PENANAGJcNufxy1s
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。664Please respect copyright.PENANAM7lJWH0rpN
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。664Please respect copyright.PENANAyoKKfQi7Z4
664Please respect copyright.PENANAdM4gp8ZFPj
日復如此,腫瘤亦得以無止境助大。664Please respect copyright.PENANAkkhaEtGyK7
664Please respect copyright.PENANAtzRZlcb17Z
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。664Please respect copyright.PENANAcysYZOZU2A
664Please respect copyright.PENANAHrUjw2MH12
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/toc664Please respect copyright.PENANAorVp7RuBYZ
664Please respect copyright.PENANAV9KDb3ruz5
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。664Please respect copyright.PENANAF8J9lkYn9T
664Please respect copyright.PENANA8bSLFDMYbY
Link:664Please respect copyright.PENANAYFIQPJkIPS
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio664Please respect copyright.PENANASGwX6uW9vr
664Please respect copyright.PENANA1MCQkqdywK
664Please respect copyright.PENANA667ERjX2Y1
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。664Please respect copyright.PENANAjHY7Jyp14p
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科普專欄–薯不揀單
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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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