近日有急凍雞翼及其他產品被測量出擁有武肺存在,但武肺能否在雞翼或其他食物上大量繁殖呢?732Please respect copyright.PENANAypJh0Cuog6
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答案是,不可以。732Please respect copyright.PENANAzWiQrH6rks
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武肺進行大量繁殖的話,必需要借助活生生的細胞幫忙,而其中先決的一步就是要進入細胞體內。732Please respect copyright.PENANAtLfFZKK3xR
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武肺可否入侵細胞,基本上視乎可唔可以達成下列3個條件。732Please respect copyright.PENANAsvUkJdE1SK
(圖1)732Please respect copyright.PENANAwTITXpLS1W732Please respect copyright.PENANACF0h5LiaVe
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1. S protein與細胞表面的ACE2觸碰。732Please respect copyright.PENANAumOmqUnRqX
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2. 細胞表面ACE2與S protein的形狀吻合,亦即是「啱嘴形」。732Please respect copyright.PENANAKvWNXMpcpj
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3. 細胞表面擁有TMPRSS2蛋白質,能夠對S protein進行切割。732Please respect copyright.PENANA3hoJu9VDGr
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滿足3大條件後,病毒就有能力能夠入侵細胞。732Please respect copyright.PENANAhA2EojX9yZ
當然,入侵細胞後還有很多因素決定武肺能否大量繁殖,但急凍雞翼連活生生的細胞也沒有,根本無可能可以大量繁殖。732Please respect copyright.PENANAzVeTj86NHU
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何謂S protein和ACE2,可到我之前所寫的文章溫故知新。732Please respect copyright.PENANAFzCHLrVcjC
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/issue/9732Please respect copyright.PENANAaOBOGktvKw
732Please respect copyright.PENANAZn84zEkBJS732Please respect copyright.PENANAMZLIZqmAQJ
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(圖2)732Please respect copyright.PENANADEZgQaQNOm
第二點所謂的「啱嘴型」,所指的就是ACE2的形狀能否與武肺的S protein形狀吻合,就好像砌Puzzle一樣,兩者不吻合的話就無法連結一起,勉強亦無幸福。732Please respect copyright.PENANAdnDYMqn8VD
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如圖中所見,正因為老鼠ACE2唔啱嘴型,所以武肺無法引致老鼠患上肺炎等病徵,袁教授等人因此亦改用啱嘴型的倉鼠作為武肺的動物實驗模型。732Please respect copyright.PENANA3M0SzIxVxA
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(Ref 1)有科學家嘗試將武肺打落豬、雞和鴨身上,最終無法在牠們的任何器官身上找到武肺,而且亦沒有出現任何病徵,因此斷定牠們並不會受到武肺感染。732Please respect copyright.PENANABQfcATFxtz732Please respect copyright.PENANAqt3hvTawG1
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(圖3)732Please respect copyright.PENANAN8UOwdzwkw
關於第三點,肺(Lung)及腎臟(Kidney)同樣擁有一定數量的ACE2及TMPRSS2(Ref2),因此將會成為武肺的主要針對對象。732Please respect copyright.PENANA2vIZuDO5d8
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而心臟(Heart) 同樣擁有一定數量的ACE2,某程度亦解釋了為何武肺患者康復後會被發現心臟出現異樣。732Please respect copyright.PENANAD8HUKUEwfc
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而男性器官睪丸(Testis),亦是ACE2數量較多的器官(圖中沒有列出),所以,嗯......732Please respect copyright.PENANAaS9Oa4lKyT
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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。732Please respect copyright.PENANAgnbMqWSB2Q
732Please respect copyright.PENANALmkhLLND1D
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/toc732Please respect copyright.PENANAbO5BAq3UyM
732Please respect copyright.PENANANIyZtlQxmJ
同時亦可以在Penana網站裡按「買一嚿薯仔」,以課金的方式推動我繼續搜羅資料寫文,多謝。732Please respect copyright.PENANAhlnSuLqGo1
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Link:732Please respect copyright.PENANAVPksdTGw4U
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio732Please respect copyright.PENANAIMS0LKRkhM
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有興趣接收科普資訊的話,歡迎follow IG: potatopigtongue。732Please respect copyright.PENANAYBjlnGrgii
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Ref1:https://science.sciencemag.org/content/368/6494/1016732Please respect copyright.PENANAUobYKEFsBQ
732Please respect copyright.PENANA22PqNr7ijX
Ref2:https://www.sciencedirect.com/science/article/pii/S221323172030820X#fig1732Please respect copyright.PENANAP7g3U6ljwZ
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科普專欄–薯不揀單
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