腎上腺(Adrenal gland),故名思義就是位於腎臟上方的腺體。735Please respect copyright.PENANA3rZesL4I56
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。735Please respect copyright.PENANAadORrhcTLB735Please respect copyright.PENANApX6WD0EBN6
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(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。735Please respect copyright.PENANApFe258bFy6735Please respect copyright.PENANAzJkxHB09X1
735Please respect copyright.PENANAk5ensu9Aqj
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。735Please respect copyright.PENANAP4olJV88wI
735Please respect copyright.PENANARHE0ccb6jF
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。735Please respect copyright.PENANAiouF3rJdbu
735Please respect copyright.PENANAWsBZem5hrt
(圖3)從圖中可見,皮質醇的存在是阻止毛髮生長的主因。735Please respect copyright.PENANAR1LsOziA6o735Please respect copyright.PENANAPb01kAYVqx
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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。735Please respect copyright.PENANAR7kRq7h69s
735Please respect copyright.PENANABOq0zHs0nI
(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;735Please respect copyright.PENANA5ZwmrGJCQj
除壓力外,年紀大亦會導致皮質醇含量上升。735Please respect copyright.PENANAlgGBYhv5Fg735Please respect copyright.PENANACn6e3lRqjs
735Please respect copyright.PENANA9yJrFzo5OJ
腎上腺被切除後,受壓對毛髮生長速度並無大影響。735Please respect copyright.PENANAdDhqZ7EwjE
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735Please respect copyright.PENANACSdU0xY32f
(圖5)上集提及過,頭髮生長分成3個階段。735Please respect copyright.PENANAHcDvTF839c
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。735Please respect copyright.PENANAlSUrO3SRjE735Please respect copyright.PENANAwxwT1q1QiY
735Please respect copyright.PENANAXj1uiL73bG
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。735Please respect copyright.PENANA2xxT3Z8bSa
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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。735Please respect copyright.PENANAqVOZjmbz3o
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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。735Please respect copyright.PENANAEvDKhVyvb0
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735Please respect copyright.PENANA8CngTzpY2I
735Please respect copyright.PENANAx3sX9V3kus
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。735Please respect copyright.PENANAtXak6pTV0W
735Please respect copyright.PENANAeCDBVCRJal
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/toc735Please respect copyright.PENANAt1P00H7IrV
735Please respect copyright.PENANADupMx46BUq
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。735Please respect copyright.PENANAeMcLvanHgv
735Please respect copyright.PENANAAMfqXxTje0
Link:735Please respect copyright.PENANA8Ym7b7GYn5
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio735Please respect copyright.PENANAssnI346gon
735Please respect copyright.PENANA10RU8FXbq8
735Please respect copyright.PENANAtvpIH8ojua
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。735Please respect copyright.PENANA517TQxPoOv
735Please respect copyright.PENANAKwBfXBWNCp
Ref1:https://www.nature.com/articles/s41586-021-03417-2735Please respect copyright.PENANA9qiS2gJ3C8
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星期六有重要演講,要花功夫溫習,明天及後天可能會停更。735Please respect copyright.PENANAVOwRSwD7Hv
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科普專欄–薯不揀單
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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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