Gene expression in occlusive vein grafts following CABG of human
To further understand the mechanism approach to occlusive vein grafts, we have employed RNA-seq to identify key genes in occlusive venin grafts following CABG in human. The occluded vein graft and intraoperative spare great saphenous vein of patients undergoing clinical re-coronary artery bypass grafting were obtained for RNA-seq.  The sequencing results were cleaned and bioinformatics annlysis was conducted by using WGCNA and a variety of online databases and software. The key genes or proteins affecting the occurrence of vein graft restenosis were screened out(ITGB2), and the expression level of the target genes or proteins was verified by real-time PCR and Western blot. And to further learn the effect of ITGB2 in human primary venous smooth muscle cells, ITGB2 gene was silenced by SiRNA. The effect of ITGB2 silencing on proliferation, migration and invasion of venous smooth muscle cells after PDGF-BB-stimulation were detected by Edu assay, scrathch experiment and transwell experiment. And Edu assay showed that ITGB2 silencing could inhibit the proliferation of PDGF-BB sitmulated smooth muscle cells. Scratch assay showed that ITGB2 silencing inhibited the migration of PDGF-BB stimulated smooth muscle cells. Transwell assay showed that ITGB2 silencing significantly inhibited the invasion of PDGF-BB stimulated smooth muscle cells. It is indicated that ITGB2 was the key gene in vein graft restenosis,and may be the potential treatment target in restenosis patients. Overall design: The occluded vein graft(O) and intraoperative spare great saphenous vein(C) of three patients undergoing clinical re-coronary artery bypass grafting were obtained. The expression of mRNA was obtained in tissues.