Pluronic F-127水凝胶复合骨髓间充质干细胞构建组织工程化脂肪的体外研究

Adipose Differentiation and Adipose Tissue Engineering of Bone Marrow-derived Mesenchymal Stem Cells Using Pluronic F-127 Hydrogel in Vitro

本实验应用Pluronic F-127水凝胶三维培养大鼠骨髓间充质干细胞(BMSCs),观察其生物相容性,并研究其对BMSCs诱导分化成脂肪细胞的影响。原代培养SD大鼠BMSCs,经诱导分化成脂、成骨和成神经鉴定后,用MTT法检测Pluronic F-127水凝胶对BMSCs的细胞毒性;将P4BMSCs均匀混合于水凝胶中,复合BMSCs的水凝胶经成胶后分别用成脂诱导液和完全培养基培养,观察并记录脂滴、脂肪细胞及脂肪组织形成情况,培养2周后油红O染色鉴定。结果表明BMSCs在Pluronic F-127水凝胶中能较好的黏附、生长及增殖。成脂诱导的水凝胶中BMSCs可分化为脂肪细胞,其中少部分聚集成脂肪细胞团,形成脂肪样组织,并经油红O染色鉴定证实。而仅加入完全培养基的水凝胶内BMSCs则未发生分化。提示BMSCs可在Pluronic F-127水凝胶三维支架中培养并被成功诱导分化为脂肪细胞,利用水凝胶负载BMSCs向脂肪细胞诱导分化可望为组织工程化脂肪提供新的思路,Plu-ronic F-127水凝胶可作为BMSCs治疗体外培养的良好支架。

The aim of this study is to investigate the growth and proliferation of bone marrow mesenchymal stem cells （BMSCs） three-dimensionally cultured in Pluronie F-127 gel, in order to explore the cellular compatibility of gel and to investigate the feasibility of BMSCs differentiating into adipocytes in gel. Rat BMSCs were isolated from adult bone marrow, and then cultured and amplified in vitro. The BMSCs derived from the 4th passage were seeded on the scaffolds and incubated in adipogenie stimuli culture to differentiate into adipoeytes. BMSCs were dispersed into gel and cultured in vitro for two weeks then the status of adhesion, growth and proliferation of the cells were observed. The adipogenic differentiation of the BMSCs was assessed by cellular morphology and further confirmed by Oil Red O staining. BMSCs were able to attach, grow and proliferate well in Pluronic F-127 gel. The BMSCs differentiated into adipocytes in gel in the presence of adipogenic stimuli over a period of 2 weeks. After only 4 days of adipogenic induction, small lipid droplets were observed within BMSCs in gel wells treated with differentiation media. At the end of 14 days, in the presence of differentiation media in gel, the size of the lipid droplets increased to occupy most of the cytoplasm, consistent with differentiation of BMSCs into adipocytes. Lipid droplets in differentiating BMSCs were positively stained with Oil Red O in the presence of differentiation media in the Pluronic F-127 treatment. We demostrated BMSCs incubated in the 3D Pluronic F-127 gel scaffolds could be induced and differentiated into adipocytes. The system for inducing differentiation of BMSCs into adipocytes is promising to apply in the construction of tissue engineering adipose tissue and the repair of fat injury, and Pluronic F-127 gel may be a suitable scaffold for cellular therapy of BMSCs.