Abstract | OBJECTIVE: To investigate whether cytochalasin D-eluting stents (CDES) suppress intimal hyperplasia in porcine coronary arteries and to compare the efficacy of paclitaxel and cytochalasin D as inhibitors of vascular smooth muscle cell (SMC) proliferation and platelet aggregation in vitro. METHODS: RESULTS: After 7 days, cytochalasin D (IC(50) 9.9+/-0.4 10(-8) M) and paclitaxel (IC(50) 1.1+/-0.4 10(-8) M) inhibited SMC proliferation in vitro (n=4). In contrast, cytochalasin D (10(-6)-10(-5) M, n=5), but not paclitaxel, attenuated platelet shape change and aggregation induced by ADP. In vivo QCA showed less late lumen loss in low-dose CDES (0.08+/-0.07 vs. 0.32+/-0.08 mm, P=0.05), but morphometry demonstrated only a tendency toward a decreased intimal area. High-dose CDES inhibited both late lumen loss (0.31+/-0.08 vs. 0.91+/-0.06 mm, P<0.01) and intimal area (1.57+/-0.20 vs. 2.46+/-0.22 mm(2), P<0.01). Immunohistochemistry revealed that CDES suppressed peri-strut macrophage recruitment (CD68, P=0.04) and cell proliferation (Ki67, P=0.03) as compared to polymer-only stents without interfering with endothelial cell recovery or the density of alpha-SMC actin staining. Thromboses or edge effects were not observed in either study. CONCLUSIONS: CDES inhibited in- stent hyperplasia. The reduction (39%) with 20 mug CDES was equivalent to that reported for paclitaxel-eluting stents in pigs. Interference with platelet aggregation, SMC migration, SMC proliferation, and leukocyte recruitment could contribute to the benefit. The data indicate that targeting of actin microfilaments has a potential to suppress in- stent restenosis.
|
Authors | Koen J Salu, Johan M Bosmans, Yanming Huang, Marc Hendriks, Michel Verhoeven, Anita Levels, Susan Cooper, Ivan K De Scheerder, Chris J Vrints, Hidde Bult |
Journal | Cardiovascular research
(Cardiovasc Res)
Vol. 69
Issue 2
Pg. 536-44
(Feb 01 2006)
ISSN: 0008-6363 [Print] England |
PMID | 16386237
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
|
Chemical References |
- Nucleic Acid Synthesis Inhibitors
- Cytochalasin D
- Paclitaxel
|
Topics |
- Animals
- Cell Movement
(drug effects)
- Cell Proliferation
(drug effects)
- Cells, Cultured
- Coronary Angiography
- Coronary Restenosis
(metabolism, prevention & control)
- Cytochalasin D
(pharmacology, therapeutic use)
- Dose-Response Relationship, Drug
- Hyperplasia
- Macrophages
(drug effects)
- Microscopy, Electron
- Models, Animal
- Muscle, Smooth, Vascular
(cytology, drug effects)
- Nucleic Acid Synthesis Inhibitors
(pharmacology, therapeutic use)
- Paclitaxel
(pharmacology)
- Platelet Aggregation
(drug effects)
- Rabbits
- Random Allocation
- Stents
- Swine
- Tunica Intima
(drug effects, pathology)
|