肌肉大概佔據身體重量的40%。472Please respect copyright.PENANAmjb1rL9zsC472Please respect copyright.PENANADOtfzIMoG5
472Please respect copyright.PENANAnUK9XTI2Y7
踏入50歲後,平均每10年就會有15-30%的肌肉流失。472Please respect copyright.PENANAMBSarnSm3o
472Please respect copyright.PENANAzqDKmSEt9h
(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。472Please respect copyright.PENANAnzOfOT270k472Please respect copyright.PENANAFDrvaG2FnC
472Please respect copyright.PENANAqcQpyF0FfW
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。472Please respect copyright.PENANAOgykxnIp3t
472Please respect copyright.PENANAlqEs9y3tsS
(圖3)而人類老化所出現的現象,老鼠亦能同樣發現得到。472Please respect copyright.PENANAHUonzPlgLg
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。472Please respect copyright.PENANAIf75o0Ev7M472Please respect copyright.PENANAFDeNFQWYYf
472Please respect copyright.PENANA3RNlqqCYJO
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。472Please respect copyright.PENANAKBCkW8UcUt
472Please respect copyright.PENANAJ8ZhAV5Mim
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。472Please respect copyright.PENANABjwOWUT8oK
472Please respect copyright.PENANAPfV6yzRfB5
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。472Please respect copyright.PENANAfqp5oxYjCE
472Please respect copyright.PENANAnyVNiYXBHV
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。472Please respect copyright.PENANA3G0aozjC9r
472Please respect copyright.PENANAGnUFhUeZYr
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。472Please respect copyright.PENANAOQkr2QWNaK
472Please respect copyright.PENANAAaOAyuQkqR
472Please respect copyright.PENANAstIVESKSFw
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。472Please respect copyright.PENANAN5jeOe8ZKb
472Please respect copyright.PENANAtp6BO1VyjL
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/toc472Please respect copyright.PENANAaHDr5f5ZT7
472Please respect copyright.PENANAVPZt5oRNg3
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。472Please respect copyright.PENANAE2bBoyJsSW
472Please respect copyright.PENANAjEYV2uyHET
Link:472Please respect copyright.PENANA30AB41UsBa
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio472Please respect copyright.PENANAOY96dHONr0
472Please respect copyright.PENANA1TaDpzHIyV
472Please respect copyright.PENANAU26Gsd8PaX
基於WhatsApp/Facebook等問題,IG將不會再作更新,只會寄居本土LIHKG及Penana。472Please respect copyright.PENANAAWx1EtQybG
472Please respect copyright.PENANAdrMaQUigxl
Ref1:https://science.sciencemag.org/content/371/6528/eabc8059472Please respect copyright.PENANAHBELn4lVdo
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科普專欄–薯不揀單
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薯仔聞茱莉

篇 #146
三十秒科學–控制肌肉重量的一隻蛋白酶
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