往不同動物例如老鼠及線蟲注射治療糖尿病的藥物(Metformin)後,壽命均會有顯著的增長。659Please respect copyright.PENANA2e9zJmN7v9659Please respect copyright.PENANA7ayqzZq1Ke
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有研究利用現成資料庫作對比,發現服用Metformin的糖尿病人歲數比沒有服用Metformin的健康人士為長(Ref1),亦有臨床研究嘗試為14名70歲的健康老人家注射為期6星期的Metformin,藉觀察體內的轉變以作抗衰老藥的研究基礎(Ref2)。659Please respect copyright.PENANAea7Yre3HsH
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(圖2)從圖中可見,往年輕線蟲注射Metformin的話,牠們的生存日子便會增長。659Please respect copyright.PENANA8UFl82Z1j3659Please respect copyright.PENANAmNyfw8089j
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(圖3)但是,與年輕線蟲相反,往年老的線蟲注射Metformin的話,牠們的生存日子不但沒有增加,反而會減少。659Please respect copyright.PENANAxYXGgbXSxO659Please respect copyright.PENANAYH5cbwlNqy
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(圖4)經過一系列的實驗,科學家認為Metformin能夠驅使年輕線蟲延壽的其中一個原因,是與粒線體的整體功用有關(Ref3)。659Please respect copyright.PENANAsWKrsNaX8r659Please respect copyright.PENANA60hNHfGbv6
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其中,Metformin為年輕線蟲的新陳代謝作出轉變,包括增加碳水化合物的分解,減低脂肪的含量等,但年老的線蟲卻沒能夠觸發同樣的效果,反而更會因新陳代謝機制的不良負荷而增加死亡率。659Please respect copyright.PENANA9cKKNxttWm
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文中的科學家亦就此作出質疑,既然Metformin只能使年輕線蟲而非年老線蟲延壽,那又究竟是否值得「魯莽」地對健康老人家進行Metformin的延壽研究。659Please respect copyright.PENANAkOy68CVBdu
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Ref1:https://pubmed.ncbi.nlm.nih.gov/25041462/659Please respect copyright.PENANAyIxErW6Nl4
Ref2:https://pubmed.ncbi.nlm.nih.gov/29383869/659Please respect copyright.PENANAqptfUFfZ5d
Ref3:https://www.nature.com/articles/s42255-020-00307-1659Please respect copyright.PENANAk1ggP0N9Kh