肌肉大概佔據身體重量的40%。471Please respect copyright.PENANAz0XGDrigOd471Please respect copyright.PENANAOOhc0Uoqmd
471Please respect copyright.PENANA1in2NZu4pQ
踏入50歲後,平均每10年就會有15-30%的肌肉流失。471Please respect copyright.PENANAt3VIirnY72
471Please respect copyright.PENANAUsy57xCH1M
(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。471Please respect copyright.PENANAijtmSVuB36471Please respect copyright.PENANAPlV07WmY8Q
471Please respect copyright.PENANAlro8Nxa6VL
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。471Please respect copyright.PENANAQdUYArLbpB
471Please respect copyright.PENANAKBIijiXCKs
(圖3)而人類老化所出現的現象,老鼠亦能同樣發現得到。471Please respect copyright.PENANADXQtU4hxDD
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。471Please respect copyright.PENANAyarRSMuTzV471Please respect copyright.PENANAu2PVQkySZn
471Please respect copyright.PENANAOmr9yu8v2F
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。471Please respect copyright.PENANAjEEzhyqLcz
471Please respect copyright.PENANAYVppjnDli0
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。471Please respect copyright.PENANAjKLSBE26Ao
471Please respect copyright.PENANA0R76HqwaBP
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。471Please respect copyright.PENANADhettqyvxu
471Please respect copyright.PENANAjs1S5z4LcM
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。471Please respect copyright.PENANAyXJ3aWZebK
471Please respect copyright.PENANA88TvfI3Dkv
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。471Please respect copyright.PENANAktJ3B5NtId
471Please respect copyright.PENANAYmcJejw9FM
471Please respect copyright.PENANAKRYIZeigE2
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。471Please respect copyright.PENANASPml6FC1Cj
471Please respect copyright.PENANAkr8YxTyQO4
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/toc471Please respect copyright.PENANANA7yNYinAm
471Please respect copyright.PENANAyM9IJmXl24
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。471Please respect copyright.PENANAH1psNDdpsT
471Please respect copyright.PENANAgiPmWN4q7A
Link:471Please respect copyright.PENANApbuSAgNP1O
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio471Please respect copyright.PENANAhfPZ7BWqOw
471Please respect copyright.PENANAvFFZE9LANB
471Please respect copyright.PENANAg4H1i3NMap
基於WhatsApp/Facebook等問題,IG將不會再作更新,只會寄居本土LIHKG及Penana。471Please respect copyright.PENANAHAUHbQtkNr
471Please respect copyright.PENANADraBbSjNBk
Ref1:https://science.sciencemag.org/content/371/6528/eabc8059471Please respect copyright.PENANACti3wGKjhu
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科普專欄–薯不揀單
作者:
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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