Poly(N-isopropylacrylamide) co-polymer films as potential vehicles for delivery of an antimitotic agent to vascular smooth muscle cells

被引:60
作者
Doorty, KB
Golubeva, TA
Gorelov, AV
Rochev, YA
Allen, LT
Dawson, KA
Gallagher, WM
Keenan, AK [1 ]
机构
[1] Natl Univ Ireland Univ Coll Dublin, Dept Pharmacol, Conway Inst Biomol & Biomed Res, Dublin 4, Ireland
[2] Univ Coll Dublin, Dept Chem, Irish Ctr Colloid Sci & Biomat, Dublin 2, Ireland
关键词
thermoresponsive co-polymers; NiPAAm/NtBAAm; colchicine; vascular smooth muscle cells; proliferation; migration;
D O I
10.1016/S1054-8807(02)00165-5
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Introduction: Local delivery of antimitotic agents is a potential therapeutic strategy for protection of injured coronary vasculature against intimal hyperplasia and restenosis. This study sought to establish the principle that thermoresponsive poly(N-isopropylacrylamide) co-polymer films can be used to deliver, in a controlled manner, an antimitotic agent to vascular smooth muscle cells (VSMC). Methods: A series of co-polymer films was prepared, using varying ratios (w/w) of N-isopropylacrylamide (NiPAAm) monomer to N-tert-butylacrylamide (NtBAAm) and loaded with the antimitotic agent colchicine (100 nmol/film) at room temperature. Results: The extent of colchicine release at 37 degreesC was inversely proportional to the amount of NtBAAm in co-polymer films: release after 48 h from 85:15, 65:35 and 50:50 (NiPAAm:NtBAAm) films was 26, 17 and 0.5 nmol, respectively. In cytotoxicity studies, when medium incubated with co-polymers for 24 h (in the absence of colchicine) was further incubated with target bovine aortic smooth muscle cells (BASMC), no loss of cell viability occurred. Colchicine released from all three co-polymer films significantly inhibited proliferation and random migration of BASMC: 100 nM colchicine (released from 65:35 NiPAAm:NtBAAm) reduced cell proliferation to 25.7 +/- 1.7% of levels seen in the absence of colchicine (control) and random cell migration to 37.7 +/- 5.7% of control (mean S.E.M., n=3, P<.01 and P<.05, respectively). The magnitudes of these effects were comparable to those seen in separate experiments with native colchicine and were observed in samples of released colchicine which had been stored at -20 degreesC for up to 6 months. Conclusions: This study has shown that the release of the antimitotic agent colchicine, from NiPAAm/NtBAAm co-polymer films can be manipulated by changes in co-polymer composition. Furthermore, such drug released at 37 degreesC retains comparable bioactivity to that of native colchicine. (C) 2003 Elsevier Inc. All rights reserved.
引用
收藏
页码:105 / 110
页数:6
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