進食含有糖份的食物後,血液胰島素濃度便會上升,輔助細胞們吸取葡萄糖。513Please respect copyright.PENANANpk7FrWH2A513Please respect copyright.PENANAQ41PnjkcAX
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在利用肌肉細胞及脂肪細胞的實驗中,胰島素錄得可以在數分鐘內增強細胞的吸收葡萄糖效率2-10倍有多。513Please respect copyright.PENANAx07ySQavtD
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(圖2)細胞需要特定位於表面的蛋白質幫忙,才能有效吸取糖份。513Please respect copyright.PENANAmXmQEaMzLL513Please respect copyright.PENANAvK791F1Qpv
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GLUT4是其中一款負責吸取糖份的蛋白質,但它平常所在的位置是在細部內部、而非位於表面。513Please respect copyright.PENANAbvWtHnW2QZ
當細胞遇上胰島素的時候,GLUT4就會轉移到細胞表面,加快細胞吸收糖份的效率。513Please respect copyright.PENANAlNyK961NTo
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(圖3)肌肉細胞及脂肪細胞均擁有GLUT4蛋白質,因此胰島素能增強它們吸取糖份的效率。513Please respect copyright.PENANAlTGmxDdaDP513Please respect copyright.PENANANWPJaIZL37
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但兩者不同的是,肌肉會將過量的糖份轉化成為糖原(Glycogen),513Please respect copyright.PENANAJaBStUscj6
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而脂肪細胞僅會將過量糖份的5%左右轉化成為糖原,另外的50%轉化成為脂肪(Triglyceride),其餘的則不會用作儲存。513Please respect copyright.PENANAhuATlZC3bA
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值得留意的是,餐後的葡萄糖,僅約20%會被脂肪細胞所吸收,另外80%均由其他細胞使用。513Please respect copyright.PENANAMXuoNnK941
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Link:513Please respect copyright.PENANAShcMSc5Viu
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio513Please respect copyright.PENANA5g9dUzeuri
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Ref1:https://www.cell.com/cell-metabolism/fulltext/S1550-4131(21)00126-1#fig1513Please respect copyright.PENANAqio8hA4U2E