腎上腺(Adrenal gland),故名思義就是位於腎臟上方的腺體。731Please respect copyright.PENANACEhbPUmvVA
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。731Please respect copyright.PENANAULPpNkTGVX731Please respect copyright.PENANA7nOtvKE2Tz
731Please respect copyright.PENANAvMRBuCAotC
731Please respect copyright.PENANAPmjn4ESS8m
(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。731Please respect copyright.PENANAlBlL9ewphJ731Please respect copyright.PENANAT7fdYJjhsx
731Please respect copyright.PENANAcxmDWOCBQb
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。731Please respect copyright.PENANA2yECoOkBA6
731Please respect copyright.PENANArTXi0Mg5lf
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。731Please respect copyright.PENANAj7eZ8pvFm1
731Please respect copyright.PENANASEFuhPMZ7P
(圖3)從圖中可見,皮質醇的存在是阻止毛髮生長的主因。731Please respect copyright.PENANA2dnFmZFLaL731Please respect copyright.PENANAH5rIrddnQ6
731Please respect copyright.PENANAyOPzxOhnHw
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。731Please respect copyright.PENANAjkNywCaTWc
731Please respect copyright.PENANAMlawOOGbNO
(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;731Please respect copyright.PENANAqGFMCZ2ukg
除壓力外,年紀大亦會導致皮質醇含量上升。731Please respect copyright.PENANAk5RtvUUuyy731Please respect copyright.PENANACSt6Q33gdC
731Please respect copyright.PENANAAA9inmEdnL
腎上腺被切除後,受壓對毛髮生長速度並無大影響。731Please respect copyright.PENANAochAzayvdP
731Please respect copyright.PENANABLvu8y70ZE
731Please respect copyright.PENANARVGv6oYLQ3
(圖5)上集提及過,頭髮生長分成3個階段。731Please respect copyright.PENANAqDD07iBqMW
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。731Please respect copyright.PENANAJ7mVHKmcxY731Please respect copyright.PENANAis9WiYPL6q
731Please respect copyright.PENANAKW52zouXk7
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。731Please respect copyright.PENANAnLV5qyCNOy
731Please respect copyright.PENANAmNO5A2JTfR
731Please respect copyright.PENANAPZayZsLEqw
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。731Please respect copyright.PENANAA2cjm69oJ1
731Please respect copyright.PENANA5srkFrnGtW
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。731Please respect copyright.PENANA4weYmKsRGu
731Please respect copyright.PENANAipURkZQq0w
731Please respect copyright.PENANAhLv7zrH4uW
731Please respect copyright.PENANADxjB5mQWJE
731Please respect copyright.PENANAr6H1o2EbC6
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。731Please respect copyright.PENANAsIkrqoWQmW
731Please respect copyright.PENANA43b1FD5Ctd
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/toc731Please respect copyright.PENANAbIBWQBeZU8
731Please respect copyright.PENANAbCTMcqumrI
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。731Please respect copyright.PENANAsuGsXvAPdQ
731Please respect copyright.PENANALd0RENneXQ
Link:731Please respect copyright.PENANAhgEvl7QQea
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio731Please respect copyright.PENANASaxhXYZJIT
731Please respect copyright.PENANA5l3Z3vyGT0
731Please respect copyright.PENANAatyYWLNIXe
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。731Please respect copyright.PENANAYYkeWSOc5R
731Please respect copyright.PENANArD1kX1dlcH
Ref1:https://www.nature.com/articles/s41586-021-03417-2731Please respect copyright.PENANAWOWLko5N3d
731Please respect copyright.PENANA4fKNpLRYas
731Please respect copyright.PENANAY2HdVcaCbk
星期六有重要演講,要花功夫溫習,明天及後天可能會停更。731Please respect copyright.PENANA8csrnnY9sA
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科普專欄–薯不揀單
作者:
薯仔聞茱莉

篇 #199
三十秒科學–壓力大導致毛髮生長速度減慢
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