腎上腺(Adrenal gland)，故名思義就是位於腎臟上方的腺體。757Please respect copyright.ＰＥＮＡＮＡ2oNW2fBzO5
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。757Please respect copyright.ＰＥＮＡＮＡHyMQd1MKuD
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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。757Please respect copyright.ＰＥＮＡＮＡuV6QWJZ8IY
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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。757Please respect copyright.ＰＥＮＡＮＡmIZUbe3wbK
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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。757Please respect copyright.ＰＥＮＡＮＡfP4VxyLjgO
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（圖3）從圖中可見，皮質醇的存在是阻止毛髮生長的主因。757Please respect copyright.ＰＥＮＡＮＡERTrqKbWka
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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。757Please respect copyright.ＰＥＮＡＮＡIAdnT76gUA
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（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;757Please respect copyright.ＰＥＮＡＮＡxyhhjxJMPz
除壓力外，年紀大亦會導致皮質醇含量上升。757Please respect copyright.ＰＥＮＡＮＡ3n4uo1tIk7
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腎上腺被切除後，受壓對毛髮生長速度並無大影響。757Please respect copyright.ＰＥＮＡＮＡyM1rcZQ6ET
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（圖5）上集提及過，頭髮生長分成3個階段。757Please respect copyright.ＰＥＮＡＮＡE5bKSqC39o
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。757Please respect copyright.ＰＥＮＡＮＡO7tuOtKwA6
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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。757Please respect copyright.ＰＥＮＡＮＡUX2PnoeHQU
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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。757Please respect copyright.ＰＥＮＡＮＡ9AxwGRr7pB
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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。757Please respect copyright.ＰＥＮＡＮＡ8kr1kwX2aV
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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。757Please respect copyright.ＰＥＮＡＮＡ68E0fgFNXd
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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/toc757Please respect copyright.ＰＥＮＡＮＡQW3V0ZBTDC
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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。757Please respect copyright.ＰＥＮＡＮＡWNwUAxdor5
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Link:757Please respect copyright.ＰＥＮＡＮＡR0iWGdpTp6
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio757Please respect copyright.ＰＥＮＡＮＡa1FvAv56ax
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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。757Please respect copyright.ＰＥＮＡＮＡ1OZJGsOJiP
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Ref1:https://www.nature.com/articles/s41586-021-03417-2757Please respect copyright.ＰＥＮＡＮＡztLTCuSdOM
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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。
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