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標題: | 基底細胞加快分化速率和細胞週期以維持細胞密度在過度增生上皮組織的調控 The regulation of accelerating the basal cell differentiated rate and cell cycle lifetime to maintain the cell density in hyperplasia |
作者: | Shuo-Jen Yang 楊碩仁 |
指導教授: | 林頌然(Hsien Yi Chiu) |
關鍵字: | 表皮,體內平衡,濕疹,皮膚炎,十二烷基硫酸鈉,細胞動力學,雙光子顯微鏡,細胞分化,活體影像,縮時攝影,PDMS膜,細胞密度,基因轉殖小鼠,細胞擠壓,細胞排除,細胞追蹤, Epidermis,Homeostasis,Eczema,Dermatitis,Sodium dodecyl sulfate,Cell dynamics,Two-photon microscopy,Differentiation,Live-imaging,Time-lapse,PDMS membrane,Cell density,Transgenic mice,Extrusion,Cell tracing, |
出版年 : | 2019 |
學位: | 碩士 |
摘要: | 表皮作為主要的皮膚屏障,透過不斷更新的基底細胞來抵禦環境中物理及化學性的傷害。而表皮為了維持體內平衡,基底細胞會向上分化成上基底細胞並採隨機分裂方式以補充基底細胞的損失。 濕疹,是最常見的炎性皮膚病變,其特徵在於異常增生性的表皮。然而,上皮細胞透過何種機制在增生過程中達到新的體內平衡仍不清楚,因此在本研究當中,我們建立了一種可以透過活體影像系統、組織學分析和體外細胞培養的方式來驗證異常增生中的基底細胞活體動態。本研究初,我們建立了處理以5% 十二烷基硫酸鈉(SDS)的濕疹模型。我們發現SDS處理後K5+ 和K10+ 細胞從第三天到第七天顯著增加。BrdU脈衝標記表明這些K5+細胞是分裂增殖性的。透過K5CreERT; ROSAmT/mG小鼠的上皮細胞追蹤法,我們的數據表明基底細胞在第一天即分化為上基底細胞,並且在處理過後幾天發現細胞分裂早先於細胞分化。此外,透過K14-H2B-EGFP小鼠的有絲分裂數及表皮增厚度,在處理後的第三天在組織及影像分析上顯著增加,有趣的是,我們還確定基礎細胞密度沒有明顯差異,僅在第3天時呈現數量下降。此外, 我們透過AVIZO Lite軟體來建立K5-H2B-EGFP; ROSAmT/mG小鼠細胞核的3D模型,用以明確定位基底細胞位置,並同樣在第三天發現細胞密度呈現下降,其餘則維持穩定。通過FUCCI小鼠的活體影像,分析呈現基底細胞分裂週期顯著地加快即壽命縮短。為了研究體外基底層過度擁擠的機制,我們從K14-H2B-EGFP鼠中收取K14+細胞並種在PDMS膜上以建立了體外模型。該研究中由於細胞密度低 ,因此K14+ 細胞僅在初始的十二小時成像中發現細胞遷移,之後則停止活動,並在十八小時內都沒觀察到細胞排除的現象。在這項研究中,我們不僅發展了濕疹模型,而且還發現基底細胞會透過加速細胞分化、改變分裂週期時間來維持基底細胞的密度恆定。因此我們認為,或許在未來抑制基底細胞分化或分裂可能是治療濕疹的策略之一。 The epidermis serves as the primary skin barrier against physical and chemical assaults from environmental influences by continually renewed new basal cells. During homeostasis, some basal cells differentiate into the suprabasal layer, while others divide and replenish the population of the basal layer stochastically from the outermost cell loss. Eczema is the most common inflammatory skin disease and is characterized by a hyperplastic epidermis. However, how epithelial cells achieve the new equilibrium in hyperplasia remains unclear. Here, we developed an intravital imaging system utilizing histological analysis, intravital imaging and in vitro cell culture to validate the cell dynamic of basal cells in hyperplasia. At first, we established an eczema model by daily 5% sodium dodecyl sulfate (SDS) treatment. We found that the K5+ and K10+ cells significantly increased from day 3 to day 7 after SDS treatment. BrdU pulse labeling indicated these K5+ cells were highly proliferative. Our data suggested that the basal cells differentiated into the suprabasal cells within 24 hours after treatment and the basal cell division induced differentiation in hyperplasia through single cell tracing in BK5CreERT; ROSAmT/mG mice. In addition, the mitotic events and the thickness of the epidermis in K14-H2B-EGFP transgenic mice dramatically increased on day 3 using long-term and day-by-day imaging, respectively, Interestingly, we also determined the basal cell density maintained a stable level and only decreased on day 3. Additionally, the 3D nucleus volume increased on day 3 by AVIZO lite software. The lifetime of basal cells significantly shortens via live imaging of Fucci mice. To exploit the mechanism of overcrowding in the basal layer, we established an in vitro model by planting K14+ cells from K14-H2B-EGFP transgenic mice on PDMS membrane. Due to low cell density, K14+ cells only undergo migration within 12 hours but no extrusion in 18 hours. In this study, we have not only developed an eczema-like model but also demonstrated a histological and dynamic analysis that basal cell accelerated the basal cell differentiated rate and lifetime of cell cycle to maintain the basal the cell density in a stable equilibrium. The inhibition of basal cell differentiation or division might be a therapeutic strategy of eczema in the future. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/74552 |
DOI: | 10.6342/NTU201901527 |
全文授權: | 有償授權 |
顯示於系所單位: | 醫學工程學研究所 |
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