高溫致鼠神經(jīng)管畸形神經(jīng)上皮中N-cadherin、bFGF、PCNA的表達及其意義研究
發(fā)布時間:2019-06-03 00:50
【摘要】:目的:研究高溫對鼠胚神經(jīng)管發(fā)育時期神經(jīng)上皮細胞的粘附聚集、增殖凋亡及細胞生長因子的影響,從而探討高溫致神經(jīng)管畸形的發(fā)生機理。方法:將孕鼠隨機分成為實驗組30只和對照組25只,實驗組鼠于孕8d下午15:30進行42℃水浴20min,對照組鼠置于37℃水浴箱20min。實驗組和對照組各10只孕鼠于孕15d處死剖腹取胎,辨認(rèn)和計數(shù)活胎、死胎、吸收胎和畸胎。其余孕鼠35只,分別于37℃和42°C水浴后2h、8h、16h、24h、48h處死,剖腹取胎,置于10%的中性福爾馬林液中固定,常規(guī)石蠟包埋、連續(xù)切片。用免疫組織化學(xué)法和圖像分析儀檢測N-cadherin、bFGF、PCNA在各期實驗組和對照組鼠胚神經(jīng)管上皮細胞的表達變化。結(jié)果:①實驗組鼠胚神經(jīng)管畸形率達70.91%,對照組致畸率為0。②N-cadherin的免疫組織化學(xué)結(jié)果:水浴后2-8h N-cadherin在對照組及實驗組神經(jīng)管上皮細胞表達呈陽性,二者之間的OD值差異無統(tǒng)計學(xué)意義,內(nèi)外界膜、脊索及神經(jīng)管周圍間充質(zhì)細胞也可見陽性反應(yīng)。水浴后16-24h, N-cadherin在對照組神經(jīng)管上皮細胞表達呈強陽性,而在實驗組表達呈弱陽性,OD值差異有統(tǒng)計學(xué)意義(p0.01),周圍組織陽性變化不明顯。至水浴后48h實驗組與對照組相比,神經(jīng)上皮N-cadherin免疫陽性反應(yīng)差異不明顯,N-cadherin蛋白在兩組神經(jīng)管組織表達均減弱。③)bFGF的免疫組織化學(xué)結(jié)果:水浴后2h、8h、16h bFGF蛋白在實驗組和對照組神經(jīng)上皮中表達,兩組OD值差異無統(tǒng)計學(xué)意義,水浴后24h-48h實驗組神經(jīng)上皮的表達弱于對照組,且OD值差異有統(tǒng)計學(xué)意義(p0.05), bFGF在兩組神經(jīng)管上皮的表達隨胚齡增加有增強的趨勢,內(nèi)外界膜、脊索和周圍間充質(zhì)也呈現(xiàn)陽性反應(yīng)。④孕8d, PCNA蛋白廣泛表達在神經(jīng)管組織,神經(jīng)管上皮細胞、神經(jīng)嵴細胞、周圍間充質(zhì)細胞均呈現(xiàn)高表達狀態(tài)。水浴后2h和8h, PCNA在實驗組神經(jīng)組織的陽性表達數(shù)低于對照組,但差異無統(tǒng)計學(xué)意義,高溫處理后16h、24h和48h PCNA在實驗組神經(jīng)管上皮組織的陽性細胞數(shù)低于對照組,且差異有統(tǒng)計學(xué)意義(p0.05)。水浴處理24h之后,PCNA在實驗組和對照組神經(jīng)組織中的陽性細胞數(shù)均有明顯下降的趨勢。結(jié)論:高溫可使N-cadherin、bFGF、PCNA在神經(jīng)管上皮細胞的表達降低,影響細胞間的識別、粘附,干擾細胞增殖與凋亡的動態(tài)平衡,誘導(dǎo)NTDs發(fā)生,是高溫導(dǎo)致神經(jīng)管缺陷的重要途徑之一。
[Abstract]:Aim: to study the effects of high temperature on adhesion and aggregation, proliferation, apoptosis and cell growth factor of neural epithelial cells during the development of neural tube in mouse embryo, so as to explore the mechanism of neural tube malformation induced by high temperature. Methods: the pregnant rats were randomly divided into experimental group (n = 30) and control group (n = 25). The rats in the experimental group were bathed at 42 鈩,
本文編號:2491546
[Abstract]:Aim: to study the effects of high temperature on adhesion and aggregation, proliferation, apoptosis and cell growth factor of neural epithelial cells during the development of neural tube in mouse embryo, so as to explore the mechanism of neural tube malformation induced by high temperature. Methods: the pregnant rats were randomly divided into experimental group (n = 30) and control group (n = 25). The rats in the experimental group were bathed at 42 鈩,
本文編號:2491546
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