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。329Please respect copyright.PENANAVO3lpqSaW5
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箇中的原因至少有三:329Please respect copyright.PENANA4jJL0CdAmW
1.致癌基因的表達率增加329Please respect copyright.PENANACbBygyPOhC
2.新陳代謝酶素變異329Please respect copyright.PENANAkFcK7x1wVG
3.周遭環境缺乏氧氣329Please respect copyright.PENANAYxYUVEuFdh
329Please respect copyright.PENANAnbd88u9ZXK
(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。329Please respect copyright.PENANAwWRcvgMQIH
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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。329Please respect copyright.PENANAODbBioW9Tt
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。329Please respect copyright.PENANAHNmSyvUkiV
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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。329Please respect copyright.PENANAKc7sIY8dVd
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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。329Please respect copyright.PENANAY2nAqNRtiL
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。329Please respect copyright.PENANAr0eyGn5sqy
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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。329Please respect copyright.PENANAFFebKDv4wn
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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?329Please respect copyright.PENANADJiFjF1GNl
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其中的一種渠道,就是從鄰近死去的細胞獲取。329Please respect copyright.PENANADEwlJ3QVfe
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詳見可閱:329Please respect copyright.PENANAh5RpY3JvyT
三十秒科學–化療效果參差的其中一道原因329Please respect copyright.PENANAYAR8jrBxQy
- 分享自 LIHKG 討論區329Please respect copyright.PENANA9DYAz0xA3s
https://lih.kg/2378848329Please respect copyright.PENANAh96xcD4jpi
329Please respect copyright.PENANAXuZp53k8cC
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。329Please respect copyright.PENANAEAiibhuc67
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。329Please respect copyright.PENANAg4hvkgxjz7
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日復如此,腫瘤亦得以無止境助大。329Please respect copyright.PENANAvNsb6xQaHv
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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。329Please respect copyright.PENANAdEtOzXHiaM
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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/toc329Please respect copyright.PENANAEWzaZ6crnv
329Please respect copyright.PENANAIZWjPjyt1E
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。329Please respect copyright.PENANArEWloy5nQ5
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Link:329Please respect copyright.PENANAVGtTz25U7a
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio329Please respect copyright.PENANALqBIaXe1Vq
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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。329Please respect copyright.PENANAhfJ9ya6cMc
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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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