Chinese Journal of Tissue Engineering Research ›› 2015, Vol. 19 ›› Issue (1): 78-84.doi: 10.3969/j.issn.2095-4344.2015.01.014
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Liu Hui-ping, Lin Zheng-hua, Zhang Guo-min, Yu Rong, Liu Wen-e, Li Ling, Gu Xu-yu
Revised:
2014-12-07
Online:
2015-01-01
Published:
2015-01-01
Contact:
Zhang Guo-min, M.D., Associate professor, Master’s supervisor, Prescription and Syndrome Research and Translational Medicine Laboratory of Hunan University of Traditional Chinese Medicine, Changsha 410208, Hunan Province, China
About author:
Liu Hui-ping, M.D., Associate professor, Prescription and Syndrome Research and Translational Medicine Laboratory of Hunan University of Traditional Chinese Medicine, Changsha 410208, Hunan Province, China
Supported by:
the National Natural Science Foundation of China, No. 81303123; China Postdoctoral Science Foundation, No. 2013T60770, 2012M511382; Specialized Research Fund for the Doctoral Program of Higher Education, No. 20114323120007; the Hunan Provincial Key Laboratory Foundation, No. 2014XNFZ06
CLC Number:
Liu Hui-ping, Lin Zheng-hua, Zhang Guo-min, Yu Rong, Liu Wen-e, Li Ling, Gu Xu-yu. Granulosa cells with stem cell properties in the rat ovary[J]. Chinese Journal of Tissue Engineering Research, 2015, 19(1): 78-84.
2.2 卵巢切片免疫组化CD34,CD133,ABCG2/Bcrp1,Pou5f1/Oct-4的表达 由石蜡切片免疫组化结果可见,CD34,CD133,ABCG2/Bcrp1,Pou5f1/Oct-4在颗粒细胞中均有所表达。其中,CD34阳性表达强烈(图2A),CD133和ABCG2/Bcrp1在成熟卵泡中均有较强表达(图2B,2C),而Pou5f1/Oct-4在成熟卵泡中表达较弱(图2D),窦前卵泡和窦状卵泡则几乎没有表达(图2F)。卵子排出后,黄素化的颗粒细胞Pou5f1/Oct-4表达迅速增强(图2E),退化至白体后,Pou5f1/Oct-4表达消失。 MIAS医学图像系统分析各图片灰度值见表2,灰度值越高表示阳性越强。结果表明,Pou5f1/Oct-4作为一种典型的干细胞标志物,在颗粒细胞中具有周期性表达的倾向。 值得注意的是,相比于阴性表达部位,无论是哪一种阳性表达的颗粒细胞都具有细胞排列疏松,细胞核扁平或呈三角形,细胞团块内部之间排列紊乱的特点。"
2.3 细胞增殖状态的观察 倒置相差显微镜下连续观察颗粒细胞的增殖情况,发现初提取的颗粒细胞在培养后半个小时左右即发生贴壁,其形态呈扁椭圆形,24 h后基本贴壁完全,48 h后贴壁牢固,细胞形态则由扁椭圆形转向三角形、梭形或多角棱形变化。此时可开始第1次换液,以除去尚未贴壁的其他细胞。 镜下观察发现,初提取细胞中,尚有少量悬浮红细胞,其形态圆,细胞中央透光度高,但换液后可及时除去,否则将影响颗粒细胞的生长状态。镜下观察可见,体外培养后数日颗粒细胞即可出现聚集生长的现象(图3A),但随着培养时间的延长,细胞的进一步增殖,聚集现象逐渐消失(图3B)。而聚集生长的现象为干细胞或肿瘤细胞所特有的一种现象,提示部分颗粒细胞具有类似于干细胞(图3E)或肿瘤细胞的生长特性。 随着传代次数的增加,单个颗粒细胞的体积逐渐变大,立体感变差,细胞间隙增宽,提示细胞之间接触抑制效应增强(图3C,3D)。"
2.5 卵巢组织与体外培养的颗粒细胞ABCG2/Bcrp1,Pou5f1/Oct-4,Nanog基因的表达 卵巢组织与体外培养的颗粒细胞均表达β-actin,ABCG2/Bcrp1,Pou5f1/Oct-4基因,但是均不表达Nanog基因。其中,β-actin和ABCG2/Bcrp1表达均明显高于Pou5f1/Oct-4,而卵巢组织的表达量要明显高于颗粒细胞。但是体外培养的颗粒细胞中Pou5f1/Oct-4仅有极微弱的表达,见图5。 从卵巢组织Pou5f1/Oct-4的免疫组化结果来看,这种低表达的情况正好与Pou5f1/Oct-4的周期性表达特性相一致,因为卵泡穿刺法获取的细胞基本源于成熟卵泡中颗粒细胞。"
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