黃金葡萄球菌這字眼,周不時亦會在新聞媒體聽得到。527Please respect copyright.PENANAfgIrtZSaQD
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它之所以被冠以黃金這稱號,是因為它能夠製造大量金黃色的葡萄球菌黃素 (Staphyloxanthin),以及微量黃色化合物4,4‘-Diaponeurosporene。527Please respect copyright.PENANATIwZQgNxIL
527Please respect copyright.PENANAX8o7KpC4WM
(圖2)當細菌入侵腸道的時候,我們的腸道內壁細胞及前來救駕的免疫細胞會釋出微量雙氧水等的游離基(Reactive oxygen species),對細菌進行攻擊。527Please respect copyright.PENANANnwJSTRTog
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但黃金葡萄球菌的金黃色葡萄球菌黃素及另外那種黃色化學物正是能夠中和游離基攻擊的色素,因此免疫系統所產生的游離基攻擊對它傷害不大。527Please respect copyright.PENANAkKkB0J5tV1
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然而,如果刪去製作色素的蛋白酶,「黃金」葡萄球菌失去抵擋游離基的手段,對宿主的感染力亦因而大大減低。527Please respect copyright.PENANAlAL8SdyG2z
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(圖3)同時間,若將負責製造黃色色素的蛋白酶從黃金葡萄球菌轉移到另一款葡萄球菌,獲得了色素製作能力的它在老鼠身上所造成的感染傷害亦更之為強,引證色素對於細菌感染力的重要性。527Please respect copyright.PENANAdaGdx4xzCR
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(圖4)再舉另外一道例子,Cryptococcus neoformans是一種真菌(fungus),527Please respect copyright.PENANATrXT2Pv0vU
它能夠製作黑色素(Melanin),亦即是上集所談及決定髮膚眼色的色素。527Please respect copyright.PENANAXGwn7RXOnv
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黑色素除了跟金黃色葡萄球菌黃素一樣能夠抵擋游離基的攻擊外,其本身帶有負極的性質更能與兩隻帶有正極的常用抗真菌素(amphotericin B 及 caspofungin)結合,大大削弱藥物傷害真菌的能力。527Please respect copyright.PENANA4hpE3kxiW6
527Please respect copyright.PENANAs5XQzAetBp
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延伸閱讀:527Please respect copyright.PENANAhe995nUfNf
深入淺出–從深海生物中發掘出抗真菌藥物527Please respect copyright.PENANA3YFtq5pQED
- 分享自 LIHKG 討論區527Please respect copyright.PENANAcssQmTmFxz
https://lih.kg/2296185527Please respect copyright.PENANAtXKUKgNRM8
527Please respect copyright.PENANA0TOKbzjGiF
527Please respect copyright.PENANA3bC7piKqxz
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。527Please respect copyright.PENANARhrXvS8sAV
527Please respect copyright.PENANA5BIbATlW36
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/toc527Please respect copyright.PENANAjuQfoxBn1O
527Please respect copyright.PENANACmavr43CnA
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。527Please respect copyright.PENANAXJlB6oXkVt
527Please respect copyright.PENANAAEJrzpljN6
Link:527Please respect copyright.PENANAKAjZYu45u9
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio527Please respect copyright.PENANANDr7p3xtDz
527Please respect copyright.PENANAUKwrdf3kr1
527Please respect copyright.PENANAgP5LSYO0Jw
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。527Please respect copyright.PENANAFHvtGlADwr
527Please respect copyright.PENANA4qmvBkvH2X
Ref1:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2743764/527Please respect copyright.PENANAcp9KhJbOcO
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科普專欄–薯不揀單
Author:
薯仔聞茱莉
ISSUE #181
三十秒科學–黃金葡萄球菌的「黃金」
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