腸道是我們身體其中一道消化器官,其內壁表面含有名為絨毛(villi)的結構,輔助營養的吸收;391Please respect copyright.PENANA6zTOY977mG
而絨毛與絨毛之間,則有名為crypt的凹陷結構。391Please respect copyright.PENANAhK40dQ1FSR
391Please respect copyright.PENANAFSWH66xRMq
391Please respect copyright.PENANAlOY00vJAw4
391Please respect copyright.PENANAPYgWMgdAGL
(圖2)凹陷的crypt結構大多由幹細胞構成,它們會自我複製及演化,且不斷向上發展到達villi結構,形成可負責幫忙吸取營養的細胞。391Please respect copyright.PENANA2mKlzeKKca
391Please respect copyright.PENANAiDT9zJBUKX
391Please respect copyright.PENANAVvV1efUpkU
391Please respect copyright.PENANAfEADtjZgWV
(圖3)若位於crypt的幹細胞出現相應的基因突變(KrasG12D /PIK3CAH1047R ),它們會釋放出界別為BMP activator及WNT inactivator的物質,而當鄰近的正常細胞吸取這些物質後,出現基因突變的機率亦會提升。391Please respect copyright.PENANAFca64LlH1C
391Please respect copyright.PENANAYhWQgK6ek7
391Please respect copyright.PENANAYTkgE6rxPS
換句話說,只要一顆位於crypt的幹細胞出現突變的話,便會出現火燒連環船一樣的效果,一傳十十傳百的透導各鄰近的細胞出現異變,成為癌細胞的一份子。391Please respect copyright.PENANAjF2sWhiG0S
391Please respect copyright.PENANAZQwjarkdh9
391Please respect copyright.PENANA1mfWbP9MGB
391Please respect copyright.PENANAOWfl7QGxS1
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。391Please respect copyright.PENANA8jCYlhr4WH
391Please respect copyright.PENANA7rhwUrxdvB
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/toc391Please respect copyright.PENANAiGIMhqXyn3
391Please respect copyright.PENANA0N0mzQyHS0
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。391Please respect copyright.PENANAk9hZ2wJozQ
391Please respect copyright.PENANAhpB0ov9dfW
Link:391Please respect copyright.PENANAZQVBeVeJAB
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio391Please respect copyright.PENANAPdzb4jVNOF
391Please respect copyright.PENANAPoTptxLbva
391Please respect copyright.PENANAdowa3SRHZ7
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。391Please respect copyright.PENANAvPlJQTMayz
391Please respect copyright.PENANAnntK88o4yW
Ref1:https://www.nature.com/articles/s41586-021-03605-0
391Please respect copyright.PENANAChrhTiLRJO