哺乳动物颌突前体细胞的来源及其分化表型

背景:目前尚不能确定哺乳动物的外胚间充质干细胞是否也来源于迁移的神经嵴干细胞.目的:了解哺乳动物颌突前体细胞的表面标志及分化方向,探讨外胚间充质干细胞的来源及其分化表型.方法:采用免疫组织化学染色联合流式细胞仪分析,观察E9.5,E10.5,E11.5,E12.5d期间,SD大鼠颅面部外胚间充质细胞的分子表达谱及其变化.结果与结论:颌突的前体细胞表达多谱系标志,包括某些神经谱系的标志以及中胚层来源的标志,随着发育的进行,神经谱系标志下调,而中胚层谱系的标志出现或上调,提示该群细胞分化活跃,具有干细胞的特点;此外在该群细胞中检测到始终有3%～4%的细胞表达神经嵴干细胞特异性标志CD57和P75,提示哺乳动物外胚间充质干细胞来源于神经嵴,在定居后逐渐分化的同时,仍以某种机制维持自身数量的稳定.

Progenitor cells in mammalian maxillofacial and mandibular processes Source and differentiation phenotype

BACKGROUND: It remains unclear whether ectomesenchymal cells also derived from neural crest stem cell in mammals.OBJECTIVE: To understand the specific markers and differentiation directions of maxillofacial and mandibular processes progenitor cells,and to explore the source and differentiation phenotype of ectomesenchymal stem cells.METHODS: The expression and changes of expression profiles of rat ectomesenchymal cells at E9.5,E10.5,E11.5,and E12.5days were observed by immunohistochemistry and flow cytometry.RESULTS AND CONCLUSION: The progenitors expressed multi-lineage markers,including neural system and several rnesenchymal tissue types,importantly the facts that molecule profiles were changed with time prolonged,suggesting these progenitors were in active differentiating stage,so they were stem like cells or contain stem like cells.Moreover,small populations(2%-3%)of CD57 and P75 phenotypes were detected by flow cytornetry,suggesting that ectomesenchymal stem cells were derived from neural crest,which maintained a quantitative stabilization though it is gradually differentiate after localization.