研究生: |
陳怡卉 |
---|---|
論文名稱: |
第二十三型絲胺酸蛋白酶於心臟發育之研究 Investigation on the role of PRSS23 in Heart Development |
指導教授: | 莊永仁 |
口試委員: |
吳華林
葉宏一 黃聲蘋 王學孝 莊永仁 |
學位類別: |
博士 Doctor |
系所名稱: |
生命科學暨醫學院 - 生物資訊與結構生物研究所 Institute of Bioinformatics and Structural Biology |
論文出版年: | 2013 |
畢業學年度: | 101 |
語文別: | 英文 |
論文頁數: | 107 |
中文關鍵詞: | 第二十三型絲胺酸蛋白酶 、Snail 、內皮至間葉細胞形態的轉化 、心臟瓣膜發育 、心室心房結構發育 、斑馬魚 |
外文關鍵詞: | PRSS23, Snail, EndoMT, Cardiac valve formation, Cardiac looping, Zebrafish |
相關次數: | 點閱:4 下載:0 |
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在胚胎心臟發育的過程中,心臟腔室的發育是極為重要的過程,其包含了心室心房結構的發育(cardiac looping)及心臟瓣膜的發育(cardiac valve formation),在這過程中,各種的酵素參與其中,然而此調控機制複雜且多變,有許多細節尚待釐清;第二十三型絲胺酸蛋白酶(PRSS23)為表現在血管內皮細胞中的新穎絲胺酸蛋白酶,在先前的研究指出,第二十三型絲胺酸蛋白酶會大量表現在小鼠心臟發育時期的心室、心房以及心臟瓣膜,但其功能卻不明瞭。本篇論文主要在了解在心臟發育過程中第二十三型絲胺酸蛋白酶所扮演的腳色為何。
我們利用分別在血管及心臟會表現綠色螢光蛋白的轉殖基因魚作為研究的動物模式系統。首先,我們取得與人類第二十三型絲胺酸蛋白酶同源的斑馬魚第二十三型絲胺酸蛋白酶基因;然後利用全覆式原位雜交(whole-mount in situ hybridization)觀察到在斑馬魚胚胎發育過程中,第二十三型絲胺酸蛋白酶會表現在心室、心房與心室心房交接的瓣膜發育位置;利用反義寡核甘酸(morpholino oligonucleotide)抑制第二十三型絲胺酸蛋白酶的蛋白質表現後,發現其會導致斑馬魚心室心房發育結構與心臟瓣膜發育異常;有趣的事,將第二十三型絲胺酸蛋白酶被預測出有蛋白脢水解功能的胺基酸突變後,在與反義寡核甘酸一起打入後,突變後的第二十三型絲胺酸蛋白酶可以有效的恢復因抑制第二十三型絲胺酸蛋白酶的蛋白質表現所導致的心室心房發育結構不正常,卻不能恢復心臟瓣膜發育異常,這結果暗示了第二十三型絲胺酸蛋白酶在心臟腔室與心臟瓣膜發育所扮演的角色可能是不同的;經由測量細胞增生狀況(BrdU incorporation assay), 抑制第二十三型絲胺酸蛋白酶的蛋白質表現會影響心肌細胞的生長造成心室心房發育結構不正常;在而組織螢光染色(immunohistochemistry)的結果顯示出在第二十三型絲胺酸蛋白酶表現量受抑制時,位於瓣膜發育處的內皮層細胞進行內皮至間葉細胞形態的轉化(Endothelial to mesenchymal transition)被抑制。為了更進一步研究第二十三型絲胺酸蛋白酶所參與內皮至間葉細胞形態的轉化中的分子機制,我們利用短夾干擾型核醣核酸(shRNA)在人類主動脈內皮層細胞上抑制第二十三型絲胺酸蛋白酶以進行細胞層次的研究;結果指出,抑制第二十三型絲胺酸蛋白酶的表現除了會使得人類動脈內皮層細胞停滯進行乙型轉化生長因子(Transforming growth factor β)所誘發的細胞形態轉化,也會抑制轉錄因子Snail的活性。另一項研究顯示,大量表現人類的第二十三型絲胺酸蛋白酶與Snail在斑馬魚中,可以有效恢復因抑制第二十三型絲胺酸蛋白酶所導致的心臟瓣膜發育異常,且大量表現人類的第二十三型絲胺酸蛋白酶,也可以恢復因抑制第二十三型絲胺酸蛋白酶蛋白質表象而導致表現量降低的Snail表現量。細胞與斑馬魚的實驗結果,證明了在內皮至間葉細胞形態的轉化中,第二十三型絲胺酸蛋白酶位於Snail上游,也證實第二十三型絲胺酸蛋白酶在心臟瓣膜發育功能在演化上是高度被包留。
本篇研究是第一篇指出第二十三型絲胺酸蛋白酶與Snail上下游關係在心臟瓣膜發育時,內皮至間葉細胞形態的轉化中不可或缺的因子,並且第二十三型絲胺酸蛋白酶的功能在演化上也是高度被保留的;除此之外,在心室、心房發育過程中,本篇也指出第二十三型絲胺酸蛋白酶也會影響心肌細胞的再生。
Cardiac chamber formation, including cardiac looping and valve formation, is a vital process involving the action of protease during embryonic heart development. Nevertheless, the regulation of these proteases during cardiac chamber formation is poorly understood. Previously, a novel vascular protease, PRSS23, is shown to be highly expressed at the heart during murine cardiac development. However, its functional role in vivo remains unclear to date. We thus aim to characterize the functional role of PRSS23 during cardiac development in this study.
To investigate the functional role of PRSS23 in cardiogenesis, we used a transgenic zebrafish line with fluorescent labeled vasculatures as the research system. Expression of prss23 was detected in the ventricle, atrium and atrioventricular (AV) canal during zebrafish embryonic development. We found morpholino knockdown of Prss23 caused severe cardiac defects as the developing heart failed to undergo loop formation, accompanied by the malformation of the atrioventricular canal. When zPrss23 DNA with mutative catalytic triad was co-injected with morpholino, the cardiac looping phenotype was rescued, but the valve formation was not. This data implied the malformation of AV canal was not caused by cardiac looping. Then we found morpholino knockdown of Prss23 repressed the cardiomyocyte proliferation during cardiac looping and inhibited the endothelial to mesenchymal transition (EndoMT) at the AV canal during the cardiac valve formation. Moreover, in human aortic endothelial cell-based assays, PRSS23 knockdown by shRNA not only repressed the TGF-β-induced EndoMT but also reduced Snail transcription suggesting Snail signaling is downstream of PRSS23 during EndoMT. We further demonstrated that human PRSS23 and SNAIL could rescue the prss23 morpholino-induced AV canal defect in zebrafish embryos, indicating PRSS23’s function in valvulogenesis is evolutionarily conserved.
We demonstrated for the first time that the initiation of EndoMT in valvulogenesis depends on PRSS23-Snail signaling, and the functional role of PRSS23 during AV valve formation is evolutionar
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