兔骨髓源性血管内皮祖细胞的分离、培养及鉴定

Isolation,Culture and Identification of Rabbit Bone Marrow-derived Vascular Endothelial Progenitor Cells

本研究探讨兔骨髓源性血管内皮祖细胞(endothelial progenitor cells,EPC)的分离、培养及鉴定方法。抽取兔骨髓细胞,用梯度密度离心法获得单个核细胞,以内皮细胞培养液培养,通过细胞形态观察、免疫组织化学试验、流式细胞术以及内皮祖细胞吞噬功能进行鉴定。结果表明,新分离的骨髓单个核细胞呈圆形,培养48小时后可见贴壁细胞呈集落样生长,细胞呈圆形或不规则形,核分裂相明显,至培养第7天成片生长的细胞集落相互连接呈梭形的内皮样细胞。内皮祖细胞免疫组织化学检测结果显示CD133(+),CD34(+),Ⅷ因子(++),KDR(++);流式细胞术鉴定结果显示CD133的阳性率为(18.23±7.12)%,CD34的阳性率为(47.71±14.85)%,CD31的阳性率为(71.61±13.51)%,KDR的阳性率为(87.24±11.40)%。细胞吞噬功能鉴定说明超过80%的贴壁细胞都特异性地摄取了Dil-acLDL和FITC-UEA-1。结论:密度梯度离心法体外分离兔骨髓源的单个核细胞,在一定的诱导培养条件下能分化成为血管内皮祖细胞。

The aim of study was to set up a suitable method of isolation, culture and identification of endothelial progenitor cells（EPC） derived from rabbit bone marrow. Density gradient centrifugation was used to isolate mononuclear cells from bone marrow, the isolated mononuclear cells were cultured with specific culture medium for EPCs. EPCs were identified by cellular morphologic observation, immunohistochemistry testing, flow cytometry and the function test of taking up Dil-ac-LDL and FITC-UEA-1. The results indicated that the newly isolated bone marrow-derived mononuclear cells exhibited a round appearance, following culture for 48 hours, adherent cells grew in colony cluster, presenting with round or irregular appearance, and nuclear division was obvious. On day 7, flaky cell colonies mutually connected together, presenting with spindle-shaped cells. Immunohistochemistry testing in the EPCs showed CD133 （＋） ,CD34（＋）, Ⅷ factor（＋＋） ,KDR（＋＋） ; flow cytometry testing showed that the positive rate of CD133 was （ 18.23 ±7. 12）%, the positive rate of CD34 was 47.71 ± 14.85 %, the positive rate of CD31 was （71.61 ± 13.51 ） %, the positive rate of KDR was （87.24 ± 11.40 ）%. And more than 80% EPC could take up both Dil-acLDL and FITC-UEA-1. It is concluded that the mononuclear cells isolated from bone marrow by density gradient centrifugation can differentiate into EPCs under special culture situation.