粒線體在大部份的教科書裡均會被描繪成為橢圓形狀,然而這與事實是完全的背道而馳。384Please respect copyright.PENANA0Msr4DoY4o
粒線體在細胞內並無固定形態,且經常會改變自身的形狀。384Please respect copyright.PENANAMYNww3UDA5
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(圖2)圖中的鬼劃符並非是茶餐廳侍應生字體、亦不是醫生字體,而是粒線體的各種倩影。384Please respect copyright.PENANAukBB2uOpL6
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由此可見得到粒線體的形象百變,絕非是普通的一個橢圓形這麼簡單。384Please respect copyright.PENANA6q2Sf7GyHy
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另一點值得注意的是圖中的藍色三角型,它標示著粒線體即將一分為二的位置;384Please respect copyright.PENANAGeN4br5BPC
有一些處於中間位置,而有一些則位於界乎邊緣的位置。384Please respect copyright.PENANAJrah37QLgi
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(圖3)橙色框架為粒線體在邊緣位置一分為二,而綠色框架為粒線體在中間位置一分為二。384Please respect copyright.PENANAHqJPAY4kp2
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兩者的分別究竟是隨機所致,還是別有用心做成的呢?384Please respect copyright.PENANA4bsHNbXPn5
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(圖4)經過一系列的研究發現,往中間分裂的粒線體為正常運作的粒線體,以一變二從而更有效率為細胞提供能源。384Please respect copyright.PENANAtLnJgTLYH0
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而朝邊緣分裂的粒線體大多是有問題的粒線體,這樣做的目的是提供訊號號令細胞殲滅自己,分解過程涉及名為lysosome的細胞器官,且被稱之為Mitophagy。384Please respect copyright.PENANAMTx64JPGwD
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有不少證據顯示,若過量的粒線體分裂過程處理失當的話,便會引致神經衰退、心臟問題甚至是癌症等疾病,所以絕對不能看少。384Please respect copyright.PENANArIo9TQoViG
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Ref1:https://www.nature.com/articles/s41586-021-03510-6.epdf?sharing_token=mzsmDs0ANdRBBQvInQMvvtRgN0jAjWel9jnR3ZoTv0OMD04Ej-fby18QAbbYG6vyeMOYV7CCtU3H37dLLVGMhZrbaWwtYnIpOFGd_LqSK3hdGqNlM7t6Rx3bnspU9DQ9gY6z-suKVBlosRUCiyfKgCZhfjCY5-MquoelNTFJO3k%3D
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