大鼠颈静脉分支-颈动脉间置模型新生内膜细胞来源研究

目的探讨大鼠颈静脉分支-颈动脉间置模型新生内膜细胞来源。方法建立SD大鼠颈静脉分支-颈动脉间置模型,分别于术后1、3、7、14和28d取静脉移植血管,定量分析新生内膜厚度,并进行α-SM—actin和CD34免疫组织化学分析。结果新生内膜增生在28d时最明显,血管吻合部位狭窄最严重,增生厚度近端（65．2±4．6）μm,远端（64．7±5．3）μm,中段（63．5±5．6）μm。新生内膜细胞主要来源于内皮细胞、相邻动脉血管平滑肌细胞或循环祖细胞,以新生内膜腔面为著。结论静脉移植血管新生内膜细胞主要来源于静脉移植血管本身内皮细胞、相邻动脉血管平滑肌细胞或循环祖细胞,提示可于血管吻合完成后进行局部干预或术后尽早全身用药,以防止移植血管狭窄。

Origin of neointimal cells in autologous vein graft in rat model

OBJECTIVE: To investigate the potential cell sources of neointimal cells in autologous vein graft in rat model. METHODS: Vein graft neointimal cell origins were investigated using a model of vein-to-artery interposition modal. Slides were stained with hematoxylin and eosin, immunohistochemical staining was also performed with primary antibodies alpha-smooth actin or CD34. RESULTS: Neointimal thickening was greater at the proximal ends (65.2 +/- 4.6) microm and, to a lesser extent, distal ends (64.7 +/- 5.3) microm, in comparison to the middle of the graft (63.5 +/- 5.6) microm. Vein-originating cells survived and make a contribution to neointimal formation within the vein graft, mostly adjacent to the lumen, suggesting an intimate association with endothelial cells, donor arterial smooth muscle cells or circulating progenitor cells. CONCLUSIONS: Vein graft neointimal cells arise predominantly from vein-derived endothelial cells, donor arteria smooth muscle cells or circulating progenitor cells. It suggests clinical relevance of stenosis-inhibiting therapies directed at the vein graft or early system pharmacologic administration.