Chinese Journal of Tissue Engineering Research ›› 2013, Vol. 17 ›› Issue (24): 4421-4428.doi: 10.3969/j.issn.2095-4344.2013.24.008
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Chen Li-ying1, Fan Kun-wu1, Wang Jin-shui2, Yu Xu-ming1, Xu Cheng1
Received:
2012-11-11
Revised:
2013-02-04
Online:
2013-06-11
Published:
2013-06-11
Contact:
Fan Kun-wu, Master, Chief physician, Department of Burns and Plastic Surgery, the Second People’s Hospital of Shenzhen, Shenzhen 518000, Guangdong Province, China
fankunwu@hotmail.com
About author:
Chen Li-ying, Associate chief physician, Department of Burns and Plastic Surgery, the Second People’s Hospital of Shenzhen, Shenzhen 518000, Guangdong Province, China
624192754@qq.com
CLC Number:
Chen Li-ying, Fan Kun-wu, Wang Jin-shui, Yu Xu-ming, Xu Cheng. Gene expression of the skin and sweat glands in different development stages of embryo[J]. Chinese Journal of Tissue Engineering Research, 2013, 17(24): 4421-4428.
2.1 不同发育阶段胎儿皮肤及附属汗腺的生物学特征 光镜下可见不同发育阶段的人类胚胎胎儿皮肤具有特殊的组织学结构,汗腺在胚胎期E10周首先于手足掌部开始发育,外观上表皮嵴中基底细胞呈树枝状向真皮方向延伸,这时表皮含有较多的脂类物质,仅由一二层细胞组成空泡状的周皮,周皮基底层细胞排列疏松且尚未形成极性细胞。 E12周后表皮基底层细胞开始充盈饱满并逐渐呈栏栅状排列,表皮嵴形成,毛囊的原基开始出现,外观形态呈相间分布的细胞团,间质细胞包绕其周围,见图1。 E13-15周皮肤表皮基底层向上已经比E10周多了1倍的细胞层组成,达2-4层,排列仍然无层次,毛乳头开始形成,见图2,相间出现的汗腺原基明显发育的比E10周更成熟。 E15-18周空泡状的周皮细胞开始脱落,皮下脂肪组织开始形成,表皮和真皮层均增厚,皮脂腺形成,足底汗腺原基内细胞呈条树枝状向真皮深层生长,见图3。"
2.2 汗腺细胞中角蛋白的表达 根据皮肤汗腺结构形成的时序大致划分为汗腺形成初期(胚芽或原基期)、汗腺形成中期和汗腺成熟期;胎儿汗腺细胞能用角蛋白7、角蛋白8、角蛋白18和癌胚抗原等生物分子标记。角蛋白7、角蛋白8、角蛋白18和癌胚抗原只在皮肤组织内的汗腺细胞中表达,而在真皮层和表皮层的其他细胞呈阴性反应,见图5。 2.3 RT-PCR检测不同发育阶段人胎儿皮肤及附属汗腺的基因表达 表皮生长因子和表皮生长因子受体的mNRA经过RT-PCR扩增后,得到特异性的DNA片段分别由149 bp和168 bp组成。RT-PCR结果显示表皮生长因子基因在胚芽期即有表达,随着胎龄的增加,表皮生长因子的表达量总体呈高水平趋势;而表皮生长因子受体基因的表达量稍稍滞后,且其表达量增幅最快是在汗腺形成初期和中期,成熟期表皮生长因子及其受体的基因则持续表达,见表1。"
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