Bisphosphonate-mediated gene vector delivery from the metal surfaces ot stents

被引:70
作者
Fishbein, I
Alferiev, IS
Nyanguile, O
Gaster, R
Vohs, JM
Wong, GS
Felderman, H
Chen, IW
Choi, H
Wilensky, RL
Levy, RJ
机构
[1] Childrens Hosp Philadelphia, Abramson Res Ctr, Div Cardiol, Philadelphia, PA 19104 USA
[2] Univ Penn, Hosp Univ Penn, Dept Chem & Biomol Engn, Philadelphia, PA 19104 USA
[3] Univ Penn, Hosp Univ Penn, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA
[4] Univ Penn, Hosp Univ Penn, Div Cardiovasc, Philadelphia, PA 19104 USA
关键词
gene therapy; local delivery; restenosis;
D O I
10.1073/pnas.0502945102
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 [理学]; 0710 [生物学]; 09 [农学];
摘要
The clinical use of metallic expandable intravascular stents has resulted in improved therapeutic outcomes for coronary artery disease. However, arterial reobstruction after stenting, in-stent restenosis, remains an important problem. Gene therapy to treat in-stent restenosis by using gene vector delivery from the metallic stent surfaces has never been demonstrated. The present studies investigated the hypothesis that metal-bisphosphonate binding can enable site-specific gene vector delivery from metal surfaces. Polyallylamine bisphosphonate (PAA-BP) was synthesized by using Michael addition methodology. Exposure to aqueous solutions of PAA-BP resulted in the formation of a monomolecular bisphosphonate layer on metal alloy surfaces (steel, nitinol, and cobalt-chromium), as demonstrated by x-ray photoelectron spectroscopy. Surface-bound PAA-BIP enabled adenoviral (Ad) tethering due to covalent thiol-binding of either anti-Ad antibody or a recombinant Ad-receptor protein, D1. In arterial smooth muscle cell cultures, alloy samples configured with surface-tethered Ad were demonstrated to achieve site-specific transduction with a reporter gene, (GFP). Rat carotid stent angioplasties using metal stents exposed to aqueous PAA-BP and derivatized with anti-knob antibody or D1 resulted in extensive localized Ad-GFP expression in the arterial wall. In a separate study with a model therapeutic vector, Ad-inducible nitric oxide synthase (iNOS) attached to the bisphosphonate-treated metal stent surface via D1, significant inhibition of restenosis was demonstrated (neointimal/media ratio 1.68 +/- 0.27 and 3.4 +/- 0.35; Ad-iNOS vs. control, P < 0.01). It is concluded that effective gene vector delivery from metallic stent surfaces can be achieved by using this approach.
引用
收藏
页码:159 / 164
页数:6
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