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首页> 外文期刊>Journal of Cellular Physiology >Enhanced chondrocyte proliferation and mesenchymal stromal cells chondrogenesis in coculture pellets mediate improved cartilage formation.
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Enhanced chondrocyte proliferation and mesenchymal stromal cells chondrogenesis in coculture pellets mediate improved cartilage formation.

机译:增强软骨细胞增殖和间叶细胞基质细胞在coculture丸软骨形成协调改善软骨形成。

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In this study, we aimed at investigating the interactions between primary chondrocytes and mesenchymal stem/stromal cells (MSC) accounting for improved chondrogenesis in coculture systems. Expanded MSC from human bone marrow (BM-MSC) or adipose tissue (AT-MSC) were cultured in pellets alone (monoculture) or with primary human chondrocytes from articular (AC) or nasal (NC) cartilage (coculture). In order to determine the reached cell number and phenotype, selected pellets were generated by combining: (i) human BM-MSC with bovine AC, (ii) BM-MSC from HLA-A2+ with AC from HLA-A2- donors, or (iii) human green fluorescent protein transduced BM-MSC with AC. Human BM-MSC and AC were also cultured separately in transwells. Resulting tissues and/or isolated cells were assessed immunohistologically, biochemically, cytofluorimetrically, and by RT-PCR. Coculture of NC or AC (25%) with BM-MSC or AT-MSC (75%) in pellets resulted in up to 1.6-fold higher glycosaminoglycan content than what would be expected based on the relative percentages of the different cell types. This effect was not observed in the transwell model. BM-MSC decreased in number (about fivefold) over time and, if cocultured with chondrocytes, increased type II collagen and decreased type X collagen expression. Instead, AC increased in number (4.2-fold) if cocultured with BM-MSC and maintained a differentiated phenotype. Chondro-induction in MSC-chondrocyte coculture is a robust process mediated by two concomitant effects: MSC-induced chondrocyte proliferation and chondrocyte-enhanced MSC chondrogenesis. The identified interactions between progenitor and mature cell populations may lead to the efficient use of freshly harvested chondrocytes for ex vivo cartilage engineering or in situ cartilage repair.
机译:在这项研究中,我们旨在调查主要的软骨细胞和之间的相互作用间充质干细胞/基质细胞(MSC)会计为改善软骨形成coculture系统。扩大人类骨髓MSC (BM-MSC)或脂肪组织(AT-MSC)培养的颗粒单独(单一)或与主要的人类从关节软骨细胞(AC)或鼻(NC)软骨(coculture)。达到细胞数量和表型,选中颗粒生成相结合:(i)人BM-MSC牛交流,(ii) BM-MSC从hla a2 +与hla a2 - AC捐赠者,或(3)人类绿色荧光蛋白转导BM-MSC交流。人类BM-MSC和交流也分别培养在transwells。细胞被评估immunohistologically,生化反应、cytofluorimetrically和rt - pcr。或AT-MSC(75%)在颗粒导致粘多糖含量高于1.6倍基于相对预期是什么不同细胞类型的百分比。效果不是transwell模型中观察到。BM-MSC数量减少(约5倍)时间,如果cocultured软骨细胞,增加II型胶原蛋白和减少类型X胶原蛋白的表达。数量如果cocultured BM-MSC和(4.2倍)保持分化表型。在MSC-chondrocyte Chondro-induction coculture一个健壮的过程由两个相伴效果:MSC-induced软骨细胞增殖和chondrocyte-enhanced MSC软骨形成。祖之间的相互作用和识别成熟的细胞群可能导致有效使用新鲜收获软骨细胞体外软骨组织工程或原位软骨修复。

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