減肥是不少女性、又或者亦是男性的終身使命。835Please respect copyright.PENANAyl16qb56vP
先天上,兩性在儲存脂肪及體脂分佈上均有非常不同的地方。835Please respect copyright.PENANAUFfOst5Tov
835Please respect copyright.PENANAdPNpnb4ymA835Please respect copyright.PENANAJ7xa8yC26p
835Please respect copyright.PENANAEKIsCwcZ1K
(圖1)已知的知識中,荷爾蒙及性別染色體在脂肪控制上均扮演著舉足輕重的角色。835Please respect copyright.PENANA2UQKYTApWx
835Please respect copyright.PENANAfZj0ByCNWx
普遍來說,女性傾向把脂肪儲存在臀部,而更年期的女性及男性則傾向把脂肪儲存在肚部。835Please respect copyright.PENANAnPvz84KKwE
835Please respect copyright.PENANAEXAQ6ZdwPx
增加更年期女性的體內雌激素濃度的話,將能減低脂肪儲存在肚部的傾向,間接證明荷爾蒙對於體脂分佈的影響性。835Please respect copyright.PENANAA6fI5UPdDb
835Please respect copyright.PENANArRvwxmiGJO
然而,性別荷爾蒙在青春期發育的時候最為旺盛,但男女性的人體嬰兒及老鼠在發育之前,體脂的分佈亦已有所不同。835Please respect copyright.PENANASQ5LTzPG2P
而且,XXY的男性比XY的男性,體脂相對為多。835Please respect copyright.PENANAIqEcEqgRTb
835Please respect copyright.PENANAYokWLnhRYP
這亦暗示性別染色體在脂肪控制上亦扮演著一定的角色。835Please respect copyright.PENANAtTsmUrDkY1
835Please respect copyright.PENANACe5OVBloWI
而近日就有科學家發表文章(Ref1),解構X染色體導致脂肪相對上較容易增加的原因。835Please respect copyright.PENANAciPvV5vDOU
835Please respect copyright.PENANArmdWtEx1HD835Please respect copyright.PENANAamFCp8eWnr
835Please respect copyright.PENANAUUd4CqXXfl
(圖2)X染色體主宰超過800種蛋白質的產生。我們的身體有一道名為X inactivation的機制,使其中一條X染色體不能正常運作,好使蛋白質不會以雙倍的方式產生,造就男性及女性相關於X染色體所產生的蛋白質水平不會有太大的差異;835Please respect copyright.PENANAaqKivE1ZMt
男性只有一條X染色體,而X inactivation亦不會發生。835Please respect copyright.PENANAGFCMDuU3cb
835Please respect copyright.PENANAzo25CyzbFe
835Please respect copyright.PENANAr03rS3ZRjm
但有時候,有一些X chromosome區域並沒有被抑制下來,造就女性身上某些蛋白質的數量會比男性為高。835Please respect copyright.PENANAVg0YXq34Kr
835Please respect copyright.PENANA1jQj3UdVTh
而現今發現,有至少四種蛋白質普遍上並沒有被X inactivation機制抑制下來。835Please respect copyright.PENANAATnXDfCZ1E
835Please respect copyright.PENANARklXjR9Quj
835Please respect copyright.PENANA9927eM18tT835Please respect copyright.PENANAgzemBmsWio
835Please respect copyright.PENANAfy97cI8McF
835Please respect copyright.PENANA5y5cZbQOOA
(圖3)Kdm5c就是其中一隻沒有被抑制下來的蛋白質,它是一種histone deacetylase,簡單來說就是有著控制基因上那一些蛋白質能夠產生出來,那一些不能產生出來的權力。835Please respect copyright.PENANAREtvzG6aQH
835Please respect copyright.PENANAhGsJYSRchF
科學家用上不同的實驗證實,Kdm5c有著控制幹細胞較容易變成為脂肪細胞的功能。835Please respect copyright.PENANAttC44p1AZI
835Please respect copyright.PENANAocNHyTP82N
在老鼠上,Kdm5c數量的多少,對於進食的數量並沒有太大的變化,但Kedm5c數量較多的老鼠身上則有著更多的脂肪。835Please respect copyright.PENANA6grcNqqN6T
835Please respect copyright.PENANAUlf4VjDX5E
而對比七百多名孖生女性體內Kdm5c數量及其BMI的話,亦能發現有著正比的關係。835Please respect copyright.PENANAIa2mlmvqCE
835Please respect copyright.PENANACAUwMv7zKt
女士先天上較易產生更多的脂肪,將有助懷孕的時候給予嬰兒更多的保護及營養需要。835Please respect copyright.PENANAsVOd0WcCAe
而Kdm5c這蛋白質是否為此先天性上而設,暫時還沒有決定性的實驗能夠證實。835Please respect copyright.PENANAMQCo0nmeHC
835Please respect copyright.PENANAliSbxqgkBL
至於能否利用基因技術或者藥物來抑制Kdm5c的數量或功效而達至減肥功效,暫時亦沒有任何的數據,而且Kdm5c顯然不只是局限於影響脂肪新陳代謝這一方面,隨意抑壓的話相當有機會會導致不良的副作用效果。835Please respect copyright.PENANA8fJTWPdTQP
835Please respect copyright.PENANASi20XI5Adv
835Please respect copyright.PENANA7pRf2L0o4R
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。835Please respect copyright.PENANAekFv4TRidx
835Please respect copyright.PENANAekvSzivvYi
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/toc835Please respect copyright.PENANAm3OHvlomvh
835Please respect copyright.PENANAlA1xVGQxsS
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。835Please respect copyright.PENANA9wAa3ByKQn
835Please respect copyright.PENANAdPHDhDVj9x
Link:835Please respect copyright.PENANADozwMou2nK
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio835Please respect copyright.PENANADmdZFoNf06
835Please respect copyright.PENANAnFb2mRxqbW
835Please respect copyright.PENANA0wraMF8l9P
有興趣接收科普資訊的話,歡迎follow IG: potatopigtongue。835Please respect copyright.PENANA0RRLAKWHaU
835Please respect copyright.PENANArB7mGv9VHf
835Please respect copyright.PENANAnABxd2z6w7
Ref1:https://www.jci.org/articles/view/140223835Please respect copyright.PENANAKn9PfColOC