人血小板裂解液替代胎牛血清促进骨髓间质干细胞的增殖

目的探讨人血小板裂解液(human platelet lysates,HPL)对骨髓间质干细胞(mesenchymal stem cells,MSCs)增殖以及生物学特性的影响。方法通过对机采血小板反复冻融获得HPL,采用密度梯度离心法从骨髓中分离MSCs,分别用10%胎牛血清(feotal calf serum,FCS)和LD-DMEM添加不同浓度的HPL进行培养,以确定最佳HPL浓度。分离6株人源MSCs,从原代开始分别用添加胎牛血清和最佳HPL浓度的LD-DMEM进行培养,对两种培养体系下6株不同来源的MSCs的增殖能力,表面标记表达量以及细胞周期进行研究,并利用t-test进行统计学分析,P<0.05视为有统计学差异。结果研究发现HPL中含有MSCs生长所必需的4种生长因子,PDGF-AB(人血小板衍生生长因子AB),bFGF(成纤维细胞生长因子),IGF-1(胰岛素样生长因子1),TGF-β1(转化生长因子β1),浓度分别为:(0.53±0.06)ng/ml,(37.5±4.31)pg/ml,(0.15±0.06)mg/ml,(5150±463)pg/ml。适合MSCs增殖的最佳HPL浓度为7.5%。两种培养条件下的细胞形态无明显区别,均为长梭形。8代以前,细胞增殖能力没有显著性差异(P>0.05),两种培养条件下的MSCs均表达CD105,CD106以及粘附分子CD29和CD44,不表达CD34,CD45,且其表达量没有显著性差异(P>0.05)。两种培养体系下绝大多数细胞处于G0-G1期,FCS培养的MSCs其G0-G1期占(96.97±0.95)%,7.5%的HPL培养的MSCs其G0-G1期占(94.58±1.56)%,两种培养条件下不同周期没有显著性差异(P>0.05)。结论本研究适合MSCs增殖的最佳HPL浓度为7.5%,HPL可以替代胎牛血清体外培养扩增人骨髓间质干细胞,并保持其生物学特性基本不变。

Human platelet lysates promotes the proliferation of mesenchymal stem cells in vitro

Objective To investigate the effect of human platelet lysates(HPL) obtained from platelet-rich plasma on the proliferation and biological characteristics of human mesenchymal stem cells(MSCs) in vitro.Methods HPL was obtained by repeated freeze-thawing of human plateletes,and the MSCs separated by density gradient centrifugation from 6 donors were expanded in medium supplemented with 10% fetal bovine serum(FCS) or HPL at different concentrations.The optimal concentration of HPL for cells culture was determi...