肌肉大概佔據身體重量的40%。253Please respect copyright.PENANAKLSwTokQU3
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踏入50歲後,平均每10年就會有15-30%的肌肉流失。253Please respect copyright.PENANA8jKoNRPotW
253Please respect copyright.PENANA771L4gxfma
(圖2)研究(Ref1)顯示老人家的肌肉裡頭,一隻名為15-PGDH的蛋白酶數量普遍地比年輕人為高。253Please respect copyright.PENANADvMyWOanV3
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而15-PGDH其中一道作用就是負責將激素PGE2及PGD2分解成為其他物質。253Please respect copyright.PENANAAzhty5ivuf
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(圖3)而人類老化所出現的現象,老鼠亦能同樣發現得到。253Please respect copyright.PENANAWpip5owQtz
除肌肉外,年長老鼠的心、肝、脾、大腸及皮膚亦出現15-PGDH蛋白酶上升的現象。253Please respect copyright.PENANAKf8OqUeRre
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當利用藥物或基因工程手段降低年老老鼠的15-PGDH數量的話,肌肉重量亦會有所提升。253Please respect copyright.PENANAsvoUFIAnFm
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相反,若強行在年輕老鼠肌肉裡頭強行表達15-PGDH的話,肌肉重量亦會有所下降。253Please respect copyright.PENANAVZkmsLnFTu
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這道研究展示出,只需對一隻蛋白酶作出針對性的抑制,便能夠達到控制肌肉重量及結構的奇效。253Please respect copyright.PENANAyvaA4zRTNl
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現時已有藥物可抑制15-PGDH,但對於人類肌肉影響的臨床研究則欠奉。253Please respect copyright.PENANAfGKdL1g5g3
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只不過的是,現今均普遍認為增加體內細胞NAD數量的話,便可舒緩甚至是扭轉細胞的老化現象。然而,15-PGDH卻需要NAD才能正常運作,這一方面所出現的矛盾則未能解釋得到。253Please respect copyright.PENANAbQ0DdjKKvN
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253Please respect copyright.PENANAwpkO4ZmA9h
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。253Please respect copyright.PENANAhU3WBOC6Ek
253Please respect copyright.PENANAc3msyjvPwI
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/toc253Please respect copyright.PENANA4l4Lu9FhwF
253Please respect copyright.PENANAQPBu9XAyS2
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。253Please respect copyright.PENANAm6OGAS3BWl
253Please respect copyright.PENANAFn1nDXvZ17
Link:253Please respect copyright.PENANADFFVCgGelc
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio253Please respect copyright.PENANArsPDAZQnEa
253Please respect copyright.PENANAH7VjqPakix
253Please respect copyright.PENANAgLG8kLhT3U
基於WhatsApp/Facebook等問題,IG將不會再作更新,只會寄居本土LIHKG及Penana。253Please respect copyright.PENANA0heRy9VczS
253Please respect copyright.PENANAuR40iftnL3
Ref1:https://science.sciencemag.org/content/371/6528/eabc8059253Please respect copyright.PENANAyrv7mLCu66
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科普專欄–薯不揀單
Author:
薯仔聞茱莉
ISSUE #146
三十秒科學–控制肌肉重量的一隻蛋白酶
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