腎上腺(Adrenal gland),故名思義就是位於腎臟上方的腺體。742Please respect copyright.PENANANR9sSmjeuN
它有著釋放出各種荷爾蒙的功能,例如皮質醇(Corticosterone)、腎上腺素(Adrenaline)及醛固酮 (Aldosterone)等等。742Please respect copyright.PENANAJZA3ukaQPl742Please respect copyright.PENANAtlNw3wFyye
742Please respect copyright.PENANAswQq7ijFB2
742Please respect copyright.PENANAxSrpRSjn4E
(圖2)研究發現,被切除腎上腺的老鼠(ADX),其生長毛髮的速度比正常老鼠(Sham)的為快。742Please respect copyright.PENANAHhMnOvmpvn742Please respect copyright.PENANA0FNGDs9pgm
742Please respect copyright.PENANANQwaxlvhvw
從圖中可見,ADX老鼠在剃毛後16日已經差不多長滿毛髮,而Sham老鼠在40日後還是接近沒有生長毛髮似的。742Please respect copyright.PENANAcPiinI8owS
742Please respect copyright.PENANARMY18sSs8H
因著腎上腺有著產生荷爾蒙的功能,科學家於是量度老鼠體內的荷爾蒙,並發現ADX老鼠體內的皮質醇(Corticosterone)明顯下降,但腎上腺素(Adrenaline)含量則沒有大變化。742Please respect copyright.PENANAYPf8pYKZs7
742Please respect copyright.PENANAEX4tt5kYir
(圖3)從圖中可見,皮質醇的存在是阻止毛髮生長的主因。742Please respect copyright.PENANA7aXVNEmhZ9742Please respect copyright.PENANATZV14QYhfE
742Please respect copyright.PENANA9OIID4m3ed
非常重要的是,皮質醇短暫性高企是不會對毛髮生長速度有所影響,皮質醇長期的存在才會有壓抑作用。742Please respect copyright.PENANA1OCD1KiMEx
742Please respect copyright.PENANAQQ0xlNg1IN
(圖4)遇上壓力時,皮質醇含量便會上升,從圖中可見壓力對老鼠毛髮生長速度的影響;742Please respect copyright.PENANAZ0m18U4VXC
除壓力外,年紀大亦會導致皮質醇含量上升。742Please respect copyright.PENANAasLh3xz6wv742Please respect copyright.PENANAZOTfid1jpX
742Please respect copyright.PENANANUbxuj0WCi
腎上腺被切除後,受壓對毛髮生長速度並無大影響。742Please respect copyright.PENANAYCoLGx4DMW
742Please respect copyright.PENANAQZOOsPjaJF
742Please respect copyright.PENANAoxt0hu8SjP
(圖5)上集提及過,頭髮生長分成3個階段。742Please respect copyright.PENANAiQVBdRvoXc
研究發現,Sham老鼠及ADX老鼠的anagen及catagen時域並無大分別,唯獨是正常老鼠的telogan階段會持續上升,而ADX老鼠則既短暫而又沒有大變化。742Please respect copyright.PENANABaQ5MPzwBj742Please respect copyright.PENANAliQ7ylWWXX
742Please respect copyright.PENANAV5MPnWNJgw
16個月的時段裡,ADX老鼠已經能完成10次毛髮3階段,而Sham老鼠僅能完成3次。742Please respect copyright.PENANA18X0Pzxcqb
742Please respect copyright.PENANARzoVyGBI5O
742Please respect copyright.PENANAlxBJVxYsxG
雖然老鼠毛髮生長的理論未必能百分百套用到心類之中,但作者在文中已深入指出皮質醇是依靠影響毛髮幹細胞周遭的細胞來影響毛髮生長。742Please respect copyright.PENANAdCHSTUOcPl
742Please respect copyright.PENANAn6EHYD55kv
或許日後可以製造出藥物來針對其機制,解決人類脫髮的煩惱。742Please respect copyright.PENANALJsysR5VCe
742Please respect copyright.PENANA4edjotszLI
742Please respect copyright.PENANAU3STmrXD4Q
742Please respect copyright.PENANAO0g6W7gdhf
742Please respect copyright.PENANAMv05YxUPSY
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。742Please respect copyright.PENANAddJOfbL7pk
742Please respect copyright.PENANAx4z5xoSn3l
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/toc742Please respect copyright.PENANArRnEOLWTgB
742Please respect copyright.PENANApVrtLX6Z1l
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。742Please respect copyright.PENANAgGvpCSpkmj
742Please respect copyright.PENANAwmOuKNLxvc
Link:742Please respect copyright.PENANAeU9xC3dfAM
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio742Please respect copyright.PENANAAypYMQGVE9
742Please respect copyright.PENANAM0WgARKlNU
742Please respect copyright.PENANA5HQhF4FCl8
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。742Please respect copyright.PENANArJbWJv5PdG
742Please respect copyright.PENANABWxKJximdn
Ref1:https://www.nature.com/articles/s41586-021-03417-2742Please respect copyright.PENANA2tIrHfITP9
742Please respect copyright.PENANAgUJyJse4nV
742Please respect copyright.PENANAzipZmS6G2F
星期六有重要演講,要花功夫溫習,明天及後天可能會停更。742Please respect copyright.PENANAWuLflWT5ZU