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。320Please respect copyright.PENANArqh4h7g4fJ
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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。320Please respect copyright.PENANAJMuAKEya6I
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320Please respect copyright.PENANAQwaBsGjLc7
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。320Please respect copyright.PENANAbb8l9Yhs1J
320Please respect copyright.PENANAPKi9VRrRTX
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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。320Please respect copyright.PENANAYgba7r2yjq
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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。320Please respect copyright.PENANAEHzqDyUeI6
320Please respect copyright.PENANA89DPojrJ0e
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。320Please respect copyright.PENANAdG4n4q81yf
320Please respect copyright.PENANA5kVAjkrAW6
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。320Please respect copyright.PENANAPwNl68iTi5
320Please respect copyright.PENANAmdbwWK7Kb1
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。320Please respect copyright.PENANAhUBTJpFfPY
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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。320Please respect copyright.PENANAPFqWtbFWbV
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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。320Please respect copyright.PENANAzVeiIFroAo
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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。320Please respect copyright.PENANAgOgQiR4aTz
320Please respect copyright.PENANA736O19Ay7t
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/toc320Please respect copyright.PENANAoBjLAQaErh
320Please respect copyright.PENANAnSOjRAKl4Z
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。320Please respect copyright.PENANAdO2JVzGiou
320Please respect copyright.PENANAQKgb8kipKU
Link:320Please respect copyright.PENANA6N5tKLehNt
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio320Please respect copyright.PENANASKZ8jm4rDL
320Please respect copyright.PENANASqdfxmCpVS
320Please respect copyright.PENANATvDoSE9L78
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。320Please respect copyright.PENANAcg3SwSkRCs
320Please respect copyright.PENANAsl4axt5VFf
Ref1:https://pubmed.ncbi.nlm.nih.gov/26763421/320Please respect copyright.PENANAXYjJlnVvvq
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科普專欄–薯不揀單
作者:
薯仔聞茱莉
篇 #198
三十秒科學–頭髮幹細胞的三個階段
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