腎上腺(Adrenal gland),故名思義就是位於腎臟上方的腺體。629Please respect copyright.PENANA2hq9yMlNVh
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。629Please respect copyright.PENANA5qRQMh0PNS
629Please respect copyright.PENANAuknNd9geeN
629Please respect copyright.PENANA6cbjEjJvsn
629Please respect copyright.PENANAImtOxnskob
(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。629Please respect copyright.PENANA3WH5NMCg3J
629Please respect copyright.PENANAt6GuCJVady
629Please respect copyright.PENANA184Cfwo0hX
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。629Please respect copyright.PENANANXZrZDgcXZ
629Please respect copyright.PENANAjvpDkHYgnJ
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。629Please respect copyright.PENANAV4pYSh7KRQ
629Please respect copyright.PENANAINa8Nq76Cc
(圖3)從圖中可見,皮質醇的存在是阻止毛髮生長的主因。629Please respect copyright.PENANALsRefRmNYj
629Please respect copyright.PENANAxGu2k8IlxO
629Please respect copyright.PENANA5TDZoa1vwa
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。629Please respect copyright.PENANAHYTB71Suh5
629Please respect copyright.PENANAp69C40m1Wf
(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;629Please respect copyright.PENANAs2ABaPKSCi
除壓力外,年紀大亦會導致皮質醇含量上升。629Please respect copyright.PENANAY6hfjZ5kIu
629Please respect copyright.PENANAJGuhi4cyWZ
629Please respect copyright.PENANAtBhYSIiCNS
腎上腺被切除後,受壓對毛髮生長速度並無大影響。629Please respect copyright.PENANAYNR2ljr42I
629Please respect copyright.PENANAL0yUsi9zEs
629Please respect copyright.PENANAVGGoPkYv6b
(圖5)上集提及過,頭髮生長分成3個階段。629Please respect copyright.PENANAR3fWyb6L1o
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。629Please respect copyright.PENANAgfGNWYjySW
629Please respect copyright.PENANAShUFDnsWWs
629Please respect copyright.PENANATvVciOgJBp
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。629Please respect copyright.PENANAbrOauMdEXP
629Please respect copyright.PENANArRS0JHJfRp
629Please respect copyright.PENANAJXjWhue2F0
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。629Please respect copyright.PENANAjnTm6hgir4
629Please respect copyright.PENANAsIsp33JBmy
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。629Please respect copyright.PENANAgP7yqbtdqO
629Please respect copyright.PENANAFxZnkoilv6
629Please respect copyright.PENANAZk3A4MY6xl
629Please respect copyright.PENANAVRHV8XIGf3
629Please respect copyright.PENANAVnRjN7qltr
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。629Please respect copyright.PENANAsYHds0TW7x
629Please respect copyright.PENANAO4FDnk83e6
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/toc629Please respect copyright.PENANA2UQEBYvV7B
629Please respect copyright.PENANAqWPRXHuVRL
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。629Please respect copyright.PENANAgHUHtfpmsp
629Please respect copyright.PENANAy5og3gk6LR
Link:629Please respect copyright.PENANALMc8zkselU
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio629Please respect copyright.PENANA1mAANqdmI1
629Please respect copyright.PENANANemlDKlLRE
629Please respect copyright.PENANAXY9JBigsN7
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。629Please respect copyright.PENANAONUPn3Z8aL
629Please respect copyright.PENANAvSBXYAAKUV
Ref1:https://www.nature.com/articles/s41586-021-03417-2629Please respect copyright.PENANAqhWmBmj1pI
629Please respect copyright.PENANArYt1nojAjk
629Please respect copyright.PENANADyFokAKOzp
星期六有重要演講,要花功夫溫習,明天及後天可能會停更。629Please respect copyright.PENANAtkoaRKQBn2