科普專欄–薯不揀單 - 三十秒科學–癌症所導致的體重流失(3)

癌細胞從原位轉移到另一器官，亦即是Metastasis，是癌病患者主要的死因。521Please respect copyright.ＰＥＮＡＮＡS4pUPU25mI
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「有趣的是」，癌細胞雖近乎不會轉移到肌肉位置裡頭，但卻能從遠處釋放物質，經由血管抵達肌肉位置，催使肌肉萎縮，亦即是癌症惡病質(cancer cachexia)。521Please respect copyright.ＰＥＮＡＮＡCWC3DBLuER
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(圖2)肌肉萎縮不但之令病人變得虛弱，難以接近正常劑量的化療，更為致命的是，當心臟肌肉及橫隔膜肌肉亦遭受到萎縮的時候，病人便會因呼吸困難等問題而逝死。521Please respect copyright.ＰＥＮＡＮＡbdExd3p2qv
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早在1858年已有科學家指出cancer cachexia的存在，但至今2021年仍是沒有FDA認可藥物治療cancer cachexia。521Please respect copyright.ＰＥＮＡＮＡTdUUhaXvpz
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(圖3)現時有不少臨床研究希望可以制衡cancer cachexia，普遍均是從營養方面入手。521Please respect copyright.ＰＥＮＡＮＡZpn67yhKEV
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但結果大多數是只能夠增加病人的脂肪組織，而沒能夠填補已萎縮的肌肉。521Please respect copyright.ＰＥＮＡＮＡeTux18JAWq
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有一點值得注意的是，肌肉細胞並非是死去，純粹是其分解蛋白質的進程比生產蛋白質的進程來得更快，因而形成萎縮。521Please respect copyright.ＰＥＮＡＮＡqH84tYrAXc
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(圖4)從研究Cancer cachexia的老鼠模型中可以看到，患癌的老鼠不但更為細小，其手腕的握力度亦有所下降。521Please respect copyright.ＰＥＮＡＮＡU09wEUlJwY
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觀察肌肉細胞橫切面的面積時，亦可以看到肌肉細胞的面積明顯有所縮細。521Please respect copyright.ＰＥＮＡＮＡlYc40dEAkc
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下集將會講解Cancer cachexia的老鼠模型所得出的其中一道結果。521Please respect copyright.ＰＥＮＡＮＡ8sMIVme7Ga
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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。521Please respect copyright.ＰＥＮＡＮＡi6HHQPKqcG
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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/toc521Please respect copyright.ＰＥＮＡＮＡ6bAsFbhHbu
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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。521Please respect copyright.ＰＥＮＡＮＡM7y6Kwz2HR
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https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio521Please respect copyright.ＰＥＮＡＮＡ9MqOhEsPNW
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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。521Please respect copyright.ＰＥＮＡＮＡ5e2olMIt4d
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Ref1:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6015555/521Please respect copyright.ＰＥＮＡＮＡdobdFvL5mL

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