科普專欄–薯不揀單 - 三十秒科學–頭髮幹細胞的三個階段

頭髮一直也是不少人所關注的議題，而頭髮的生長，實情跟幹細胞(Stem cell)息息相關。539Please respect copyright.ＰＥＮＡＮＡWkPLU4P5Ia
539Please respect copyright.ＰＥＮＡＮＡspQQJnhm6H
539Please respect copyright.ＰＥＮＡＮＡSuxkHiy3ap
（圖2）頭髮的生長，是由位於髮囊底部名為hair-follicle stem cells (HFSCs)的幹細胞產生出來。539Please respect copyright.ＰＥＮＡＮＡh9kWqqeWfO
539Please respect copyright.ＰＥＮＡＮＡiP1d4PMFCT
539Please respect copyright.ＰＥＮＡＮＡYs3i6uGzUQ
這些幹細胞會不斷地進行三個階段的循環，分別為anagen、catagen以及telogen。539Please respect copyright.ＰＥＮＡＮＡDjhJJkLKwQ
539Please respect copyright.ＰＥＮＡＮＡBR53qr6bDF
539Please respect copyright.ＰＥＮＡＮＡ4OJqbHgo9O
（圖3）當anagen發生的時候，HFSCs幹細胞就會開始進行自我複製，經一系列的程序後便會導致毛髮生長;這階段可持續進行數年。539Please respect copyright.ＰＥＮＡＮＡiW2KBEr06V
539Please respect copyright.ＰＥＮＡＮＡ1WLICFyJlF
539Please respect copyright.ＰＥＮＡＮＡCbT99XnvTW
而當到達catagen的時候，毛髮便會停止生長，但依舊維持原位。539Please respect copyright.ＰＥＮＡＮＡSzKgMhnMZR
539Please respect copyright.ＰＥＮＡＮＡyhpm4b4mAY
之後便會進入telogan階段， HFSCs幹細胞進入「冬眠」狀態，不作任何複製舉動，而毛髮亦會因而自然地脫落。539Please respect copyright.ＰＥＮＡＮＡc6rg4A8RwS
539Please respect copyright.ＰＥＮＡＮＡ3LuEL0MiBJ
落入telogan階段後，幹細胞便會再度進入anagen階段，重新開始產生毛髮。539Please respect copyright.ＰＥＮＡＮＡFwLgperdXe
539Please respect copyright.ＰＥＮＡＮＡozu6SznAZF
健康人士的HFSCs幹細胞，高達80-90%處於anagen，10-20%處於catagan，只有1-5%處於telogan階段。539Please respect copyright.ＰＥＮＡＮＡroJNUHxkQq
539Please respect copyright.ＰＥＮＡＮＡ0GrW1j1zKy
由此可以推想出，脫髮或者禿頭的原因就是大多數的HFSCs處於catagan或telogan階段，並不再重返anagen階段。539Please respect copyright.ＰＥＮＡＮＡviemNGQSDR
539Please respect copyright.ＰＥＮＡＮＡKNkNgpy76v
下集將會講解為何壓力過大會導致脫髮，箇中的原理涉及荷爾蒙的改變，及幹細胞三階段的失衡。539Please respect copyright.ＰＥＮＡＮＡ0xOWEHTnqJ
539Please respect copyright.ＰＥＮＡＮＡdFeWE8NwhF
539Please respect copyright.ＰＥＮＡＮＡGB0U0lFbg2
539Please respect copyright.ＰＥＮＡＮＡOd52Mvj1cU
539Please respect copyright.ＰＥＮＡＮＡNMT6BTRdvy
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。539Please respect copyright.ＰＥＮＡＮＡ6bpS1fIW7M
539Please respect copyright.ＰＥＮＡＮＡCbMt9TQZUf
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/toc539Please respect copyright.ＰＥＮＡＮＡntdkFhOzEF
539Please respect copyright.ＰＥＮＡＮＡpfXEeqyqB8
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。539Please respect copyright.ＰＥＮＡＮＡ8TbVnsebE5
539Please respect copyright.ＰＥＮＡＮＡ6X8qjK5Mfx
Link:539Please respect copyright.ＰＥＮＡＮＡ4EiTn5DQwv
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio539Please respect copyright.ＰＥＮＡＮＡsto3nvFIpP
539Please respect copyright.ＰＥＮＡＮＡKLKKNSlmim
539Please respect copyright.ＰＥＮＡＮＡltZXtU88ir
除非Facebook及IG重開侵侵的account，否則我的IG將不會再作更新，只會寄居本土LIHKG及Penana。539Please respect copyright.ＰＥＮＡＮＡqpglPChgOy
539Please respect copyright.ＰＥＮＡＮＡd7Hmsb9DUE
Ref1:https://pubmed.ncbi.nlm.nih.gov/26763421/539Please respect copyright.ＰＥＮＡＮＡkFGEF2CWoO

ns3.17.59.50da2

介面主題:

字體大小:

行距:

段距:

自動加載下一章