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。669Please respect copyright.PENANAWcEae8tM5d669Please respect copyright.PENANA1Tb24KBGbU
669Please respect copyright.PENANAHJgTNaA3OM
箇中的原因至少有三:669Please respect copyright.PENANAK4F0Y7zxrm
1.致癌基因的表達率增加669Please respect copyright.PENANAIwI3EzbPeo
2.新陳代謝酶素變異669Please respect copyright.PENANAttpqsZam8m
3.周遭環境缺乏氧氣669Please respect copyright.PENANAAquYSOSNkA
669Please respect copyright.PENANABGuoAGswTY
(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。669Please respect copyright.PENANAX29s9gtuL3669Please respect copyright.PENANA0iUbeiBq3u
669Please respect copyright.PENANAkezqIYcpCt
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。669Please respect copyright.PENANAK1lNfFLKcb
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。669Please respect copyright.PENANAhRXjHiCKpC
669Please respect copyright.PENANANZhzSatx9h
(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。669Please respect copyright.PENANA8o1UUhc7GX669Please respect copyright.PENANAR51S1a6rzk
669Please respect copyright.PENANAi0uA3jvOql
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。669Please respect copyright.PENANAjUaGlCgjE8
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。669Please respect copyright.PENANAw6JpvY21Kp
669Please respect copyright.PENANAI6iB2u9LOq
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。669Please respect copyright.PENANATtvyMpwx2b
669Please respect copyright.PENANA57cSHMNPu1
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?669Please respect copyright.PENANAxU6HZhj2Ft
669Please respect copyright.PENANABqOxxA6F0C
其中的一種渠道,就是從鄰近死去的細胞獲取。669Please respect copyright.PENANAQmfxuyT3VQ
669Please respect copyright.PENANAJNR6TDxJiA
詳見可閱:669Please respect copyright.PENANAyOKbIyKh3Z
三十秒科學–化療效果參差的其中一道原因669Please respect copyright.PENANAvtgHBYdLo7
- 分享自 LIHKG 討論區669Please respect copyright.PENANAQHKO5ElWe2
https://lih.kg/2378848669Please respect copyright.PENANAuZTZByc7FG
669Please respect copyright.PENANAStnXHf7MqN
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。669Please respect copyright.PENANA24KW4SX37H
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。669Please respect copyright.PENANAVe0aHzAXFd
669Please respect copyright.PENANATIfKProbTk
日復如此,腫瘤亦得以無止境助大。669Please respect copyright.PENANALpMDpdzXIu
669Please respect copyright.PENANAJjGnhT70a0
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。669Please respect copyright.PENANABtAyr2MCk4
669Please respect copyright.PENANA7K1lnwEFhZ
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/toc669Please respect copyright.PENANANIOhAji69L
669Please respect copyright.PENANAGegcJbsPGo
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。669Please respect copyright.PENANA85GmvqUCIw
669Please respect copyright.PENANA78v5KbJO0V
Link:669Please respect copyright.PENANAHEZnn2Qfz5
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio669Please respect copyright.PENANAQFainsph4r
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669Please respect copyright.PENANA2RaDSNyl8u
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。669Please respect copyright.PENANALogAjJsPSb
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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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