腎上腺(Adrenal gland),故名思義就是位於腎臟上方的腺體。691Please respect copyright.PENANAlbvUOgE97u
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。691Please respect copyright.PENANA2J9TbvGxbb691Please respect copyright.PENANAPK4UW1idk5
691Please respect copyright.PENANAjvqIKKaTP4
691Please respect copyright.PENANA70d8ODHRfG
(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。691Please respect copyright.PENANA3UFPOvJeHe691Please respect copyright.PENANAnAc5ocQgLG
691Please respect copyright.PENANA5kGoctZStk
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。691Please respect copyright.PENANAV5UQPBB3m2
691Please respect copyright.PENANA6BWftiPoe0
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。691Please respect copyright.PENANAwlhfr8ly8E
691Please respect copyright.PENANAl7bPlHki1Y
(圖3)從圖中可見,皮質醇的存在是阻止毛髮生長的主因。691Please respect copyright.PENANAdkdEyVUBud691Please respect copyright.PENANA3OvjpGtVK1
691Please respect copyright.PENANAaoQXk2r3J7
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。691Please respect copyright.PENANAYoNpKc5jat
691Please respect copyright.PENANAesooQAnQmn
(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;691Please respect copyright.PENANAWkSHGrq5av
除壓力外,年紀大亦會導致皮質醇含量上升。691Please respect copyright.PENANA9tDdsRBO65691Please respect copyright.PENANA4FJJ4NNcr5
691Please respect copyright.PENANAaGWojbt4u2
腎上腺被切除後,受壓對毛髮生長速度並無大影響。691Please respect copyright.PENANALe8uEAbNnL
691Please respect copyright.PENANAjDHo8TBmRV
691Please respect copyright.PENANAdV8nT5uz2Y
(圖5)上集提及過,頭髮生長分成3個階段。691Please respect copyright.PENANAlcrvM0nGvp
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。691Please respect copyright.PENANAXLmK0MZgLy691Please respect copyright.PENANAu5OlCWn7Zs
691Please respect copyright.PENANA4K3ri0WT2x
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。691Please respect copyright.PENANABC0zEfgLYJ
691Please respect copyright.PENANAtPgWS4bwEF
691Please respect copyright.PENANArvQHepzL0S
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。691Please respect copyright.PENANAlq8KNTxZBf
691Please respect copyright.PENANA13UpRisjlz
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。691Please respect copyright.PENANAFgXjSZ7TDl
691Please respect copyright.PENANAdWyFnE6RiU
691Please respect copyright.PENANA7407IaSaQB
691Please respect copyright.PENANACTceHsfGNd
691Please respect copyright.PENANAX0SM0W6jIB
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。691Please respect copyright.PENANAlN9IKXALrD
691Please respect copyright.PENANAiSr1vEJmlx
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/toc691Please respect copyright.PENANAX0Vf2K48l5
691Please respect copyright.PENANATKL6GeBP9U
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。691Please respect copyright.PENANAqOFm8EU9rq
691Please respect copyright.PENANA0S2evuLjAY
Link:691Please respect copyright.PENANAmxpACOEAO4
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio691Please respect copyright.PENANAU8Nu6GcVW4
691Please respect copyright.PENANALdIRekldCK
691Please respect copyright.PENANAXIvmOq6ARl
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。691Please respect copyright.PENANAHDMndfXSkM
691Please respect copyright.PENANAO6S1O87yKR
Ref1:https://www.nature.com/articles/s41586-021-03417-2691Please respect copyright.PENANAyJ6YIVRg9Z
691Please respect copyright.PENANABmoq9Weiye
691Please respect copyright.PENANAtDrpyERGQK
星期六有重要演講,要花功夫溫習,明天及後天可能會停更。691Please respect copyright.PENANAlaZL5WUAWr