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。441Please respect copyright.PENANAsfDhlxth1G
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(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。441Please respect copyright.PENANAhMSZQOc4k9
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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。441Please respect copyright.PENANAT926LbFDPA
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(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。441Please respect copyright.PENANAIOUpgGoZJK
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而當到達catagen的時候,毛髮便會停止生長,但依舊維持原位。441Please respect copyright.PENANAsmaNojMOyq
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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。441Please respect copyright.PENANAlRhA5s1xvG
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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。441Please respect copyright.PENANAsGHmhoQj47
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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。441Please respect copyright.PENANALynOLyAWA0
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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。441Please respect copyright.PENANA82hX7xS0qi
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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。441Please respect copyright.PENANAQBN4tpAWDn
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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。441Please respect copyright.PENANAfDDqOQWrZv
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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/toc441Please respect copyright.PENANAmFYBlYYtf3
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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。441Please respect copyright.PENANAbsF9x0dXjR
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Link:441Please respect copyright.PENANAQ8JIqxidqV
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio441Please respect copyright.PENANAHIaiuw5WVu
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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。441Please respect copyright.PENANAQ4o2VygMNj
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Ref1:https://pubmed.ncbi.nlm.nih.gov/26763421/441Please respect copyright.PENANAIJ5JCWDlcb