去端肽胶原介导小干扰RNA抑制大鼠静脉移植物内膜增生

Objective To evaluate the efficacy of using small interfering RNA targeting TF as a therapy for vein graft failure. Methods External jugular vein to carotid artery interposition vein grafts, which were applied to a low flow condition, were made in 120 Sprague-Dawley rats weighing 260 to 300 g. These rats were randomly divided into 4 groups, 30 rats each group. Group A was atelocollagen-TF Stealth<'TM> Select RNAi group. Group B was atelocollagen-TF Stealth<'TM> RNAi group. Group C was atelocollagen group. Group D was control group. Small interfering RNA mixed with atelocollagen was administrated to the external wall of grafted veins. The TF protein expression of vein gratis was analyzed by Western blot at 1, 3, 7, 14, and 28 d postoperatively, and by immunochemistry at 3 d postoperatively. The proliferation index was determined at 14 d postoperatively. Neointimal hyperplasia was evaluated at 28 d postoperatively. BLOCK-iTTM fluorescent oligo was used to confirm its stability and successful transfer into the vein graft wall at 3 and 7 d postoperatively for another group (n = 12). Results Fluorescence of BLOCK-iT<'TM> fluorescent align could be detected in the graft wall even at 7 d postoperatively. Knockdown of the TF expression was achieved by perivascular application of siRNA using atelocollagen. Compared with control group, the intima thickness at 28 d after grafting was significantly reduced (P ＜ 0.05). This phenomenon was preceded by significant reduction of cell proliferation in siRNA-treated grafts at 14 d postoperatively (P ＜0.05). Conclusion The expression of TF in vein grafts can be effectively inhibited by specific siRNAs using a atelocoilagen-based nonviral delivery approach/n vivo, so that the neointimal thickening can be prevented.

Atelocollagen-mediated small interfering RNA delivery for effective gene silencing in rat vein grafts