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主题:低表达CD34+CD38-的脐带血造血干细胞体外T淋巴细胞分化潜能高于骨髓造血干细胞低表达CD34+CD38-的脐带血造血干细胞体外T淋巴细胞分化潜能高于骨髓造血干细胞; A/ q+ j; _8 E# u6 x6 m
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说明:原文来源自Haematologica. 2011 Feb 17,由干细胞之家新闻小组成员deron翻译(转帖请注明)。这是一篇实验性的paper" Y k$ n4 \% E8 M" P+ q, Z
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1 y8 b5 D& c D1 z2 e$ D* }+ J背景:人类骨髓和脐带血是(同种)异基因造血干细胞移植的来源,这种干细胞移植疗法可治疗多种疾病并且担负着恢复T细胞的重任。受者移植后T细胞重构建的观察研究显示来源于脐血造血干细胞的T细胞更具重构建能力。这项研究着眼于脐血和骨髓造血干细胞在体外生成T细胞的能力对比。2 ^1 p+ L" E h2 \" M
设计方法:造血干细胞在OP9-Deltalike-1 和OP9-绿色荧光蛋白共培养物中培养用以分别评估T细胞和骨髓的生成能力。T系或者骨髓分化的表面标记通过流式细胞计数检测并用于分析培养期间的功能动态。造血干细胞用羧基荧光素二醋酸盐琥珀酰亚胺酯标记并在培养后分析跟踪后续几代的表型情况。混合OP9-Deltalike-1共培养组用羧基荧光素二醋酸盐琥珀酰亚胺酯标记骨髓和未标记的脐血造血干细胞,或者用羧基荧光素二醋酸盐琥珀酰亚胺酯标记的脐血造血干细胞和未标记的骨髓,来评估它们在T系分化中的相互影响。造血干细胞的T细胞潜能通过有限稀释分析来量化处理(有限稀释分析:应用波松分布来估计一群细胞中具有特定的特异性和功能的反应细胞的频率的方法)。# I- Q* z7 M* [5 ^. c8 ?
结果:批量培养显示脐血造血干细胞向T细胞的分化更快且更全面。更重要的是,基于CD34和CD7的协调表达,脐带血和骨髓造血干细胞的T淋巴细胞分化能力可以在早期分辨出来。脐血造血干细胞和骨髓造血干细胞的混合实验显示这些差异为细胞内源性的。量化克隆分析证明低表达CD34+CD38-的脐血造血干细胞的T系分化能力是骨髓造血干细胞的两倍,然而骨髓分化能力两者是相近的。
* z" y* Y* Z5 C" e0 N9 d8 r结论:我们的数据表明脐血造血干细胞比骨髓造血干细胞具有更高的T淋巴细胞分化潜能且这是一种细胞自主性能力。
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Background——Human bone marrow and umbilical cord blood are sources for allogeneic hematopoietic stem cell transplantation, which is a life saving treatment in a variety of diseases but is burdened by delayed T-cell restoration. Observational studies evaluating the T cell reconstitution in post-transplant recipients argue for a more effective T cell reconstitution capacity of cord blood hematopoietic stem cells. This study focuses on the comparison of the capacity of cord blood and bone marrow hematopoietic stem cells to generate T cells in vitro
7 y D/ X: W: }* c& YDesign and methods——Hematopoietic stem cells were cultured in OP9-Deltalike-1 and OP9-green fluorescent protein cocultures to estimate T and myeloid generation capacity, respectively. Phenotypic markers of T-lineage or myeloid differentiation were measured by flow cytometry and used to analyze their kinetics in function of culture time. Hematopoietic stem cells were labeled with carboxyfluorescein diacetate succinamidyl ester and analyzed after culture to track their phenotypic progression in the consecutive generations. Mixed OP9-Deltalike-1 cocultures were done with either carboxyfluorescein diacetate succinamidyl ester -labeled bone marrow and unlabeled cord blood hematopoietic stem cells, or vice versa, to evaluate their mutual influence on T lineage differentiation. The T cell potential of hematopoietic stem cells was addressed quantitatively by limiting dilution analysis./ z- K/ ^- s2 C( T3 v/ L
Results——Bulk cultures showed faster and more extensive T cell differentiation by cord blood hematopoietic stem cells. Furthermore, the T lymphoid differentiation capacity of cord blood and blood marrow hematopoietic stem cells can be discriminated very early based on the coordinated expression of CD34 and CD7. Mixing experiments with cord blood hematopoietic stem cells and bone marrow hematopoietic stem cells showed that these differences are cell intrinsic. Quantitative clonal analyses demonstrated that CD34+CD38-/lo hematopoietic stem cells from cord blood contained a two-fold higher T-lineage generation capacity than CD34+CD38-/lo bone marrow hematopoietic stem cells, whereas the myeloid differentiation was similar.
! R' r4 S' f! |) r. o' l& f. }Conclusions——Our data shows that cord blood hematopoietic stem cells have higher T lymphoid differentiation potential than bone marrow hematopoietic stem cells and that this property is cell autonomous.. E* n( u' j) ~+ x8 X9 U* `) E
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实验步骤简介:. g* j7 a) i8 `# ^% r7 A! T# t
CFSE(羧基荧光素二醋酸盐琥珀酰亚胺脂)标记技术是近年发现的一种先进的活细胞标记技术。CFSE作为一种可穿透细胞膜的荧光染料,具有与细胞特异性结合的琥珀酰亚胺脂基团和具有非酶促水解作用的羧基荧光素二醋酸盐基团,是一种良好的活细胞标记物。
- ~" c9 l# F( W) m- z两种细胞共培养的操作步骤保证了完全一致的外部条件,而作者用CFSE标记其中的一类细胞,之后用有限稀释分析来量化处理结果得到结论。这是一个可以借鉴的实验思路,不必消除外部影响因素。: }* k# s$ Z; @% \. ^# I) U
CFSE标记处理步骤——作者用PBS+0.1%FBS+5uMCFSE,37摄氏度4min后,加入冷的含30%FBS的PBS中和,细胞冲洗三遍,在培养基中过夜孵育去除残余CFSE X4 V' X; u9 _: D0 J) g$ m7 d
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