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Chondrogenic stimulation in mesenchymal stem cells using scaffold-based sustained release of platelet-rich plasma

机译:使用基于支架的富含血小板的血浆的支架持续释放间充质干细胞的软骨溶性

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Developing minimal invasive strategies via injectable hydrogels for effective repairing of cartilage defects is highly desired. Injectable hydrogels, which can simultaneously embed cell and growth factors (GFs), serve as in situ formed scaffolds and could support an accelerated tissue regeneration process. The purpose of this study is to fabricate a composite injectable hydrogel, based on alginate (Alg)/polyvinyl alcohol (PVA) incorporating platelet rich plasma (PRP)-encapsulated Alg sulfate (AlgS) microbeads, as a localized sustained release system of GFs, for the articular cartilage regeneration. The results show that synthesized AlgS microbeads support the sustained release of PRP GFs during 14 days, where preserve the bioactivity of them more than the free PRP. Rabbit adipose-derived mesenchymal stem cells in contact with PRP-loaded AlgS beads show more proliferation (2.7 folds) and have obviously higher deposition of collagen type Iota Iota and GAGs than free PRP treated ones. In addition, cells encapsulated into the hydrogel including PRP sustained release system show upregulated expression of collagen type Iota Iota (61 folds), Aggrecan (294 folds) and SOX9 (71.5 folds), as cartilage-critical genes, compared to the direct treatment by PRP. To summarize, the developed hybrid Alg/PVA hydrogel embedding with PRP-encapsulated AlgS microbeads is suggested as a potential in situ formed scaffold for cartilage regeneration.
机译:开发通过可注射水凝胶有效修复软骨缺损的微创策略是非常需要的。可注射水凝胶可以同时嵌入细胞和生长因子(GFs),作为原位形成的支架,可以支持加速组织再生过程。本研究的目的是以海藻酸钠(Alg)/聚乙烯醇(PVA)为基础,加入富含血小板血浆(PRP)包裹的Alg硫酸盐(AlgS)微球,作为GFs的局部缓释系统,制备复合注射水凝胶,用于关节软骨再生。结果表明,合成的AlgS微球在14天内支持PRP-GFs的持续释放,其生物活性比游离的PRP保留得更多。与游离PRP处理的兔脂肪间充质干细胞相比,与PRP负载的AlgS珠接触的兔脂肪间充质干细胞显示出更多的增殖(2.7倍),并且具有明显更高的胶原型Iota和GAG沉积。此外,与PRP直接治疗相比,包裹在包括PRP缓释系统在内的水凝胶中的细胞显示出胶原型Iota Iota(61倍)、聚集蛋白聚糖(294倍)和SOX9(71.5倍)作为软骨关键基因的上调表达。综上所述,所开发的混合Alg/PVA水凝胶包埋PRP包裹的AlgS微球被认为是软骨再生的潜在原位支架。

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