Histopathologic alterations following local delivery of dexamethasone to inhibit restenosis in murine arteries
article
Objective: Dexamethasone-eluting stents are currently under evaluation to prevent post-angioplasty restenosis. The efficacy and safety of dexamethasone as an anti-restenotic agent is still unclear. We assess the effect of perivascular delivery of dexamethasone on vascular pathology in a mouse model of restenosis. Methods and results: In this study we investigate the ability of both systemic and local dexamethasone treatment to inhibit neointima formation after cuff placement around C57BL/6 mouse femoral artery. As in the clinical situation, systemic dexamethasone treatment shows adverse side effects in animals, including weight loss. In contrast, local delivery of dexamethasone using a drug-eluting polymer cuff inhibits neointima formation and has no systemic adverse effects. Pathobiological examination of the experimental arteries, however, reveals a dose-dependent medial atrophy, a reduction in vascular smooth muscle cells and collagen content, an increase in apoptotic cell count and disruption of the internal elastic lamina. Conclusions: Our results demonstrate that although local dexamethasone delivery is effective as an inhibitor for neointima formation, it is dose-dependently associated with adverse vascular morphological changes pointing to a loss of vascular integrity. © 2005 European Society of Cardiology. Published by Elsevier B.V. All rights reserved. Chemicals / CAS: collagen, 9007-34-5; dexamethasone, 50-02-2; Anti-Inflammatory Agents; Collagen, 9007-34-5; Dexamethasone, 50-02-2
Topics
Biomedical ResearchAnimal modelsArteriesHisto(patho)logyRestenosisSmooth muscleStentscollagendexamethasoneangioplastyanimal experimentanimal modelanimal tissueapoptosisarterycell countconcentration responsecontrolled studydrug efficacydrug eluting stentdrug safetyfemoral arteryhistopathologyintimamousenonhumanpriority journalrestenosissmooth muscle fibervascular smooth muscleweight reductionAngioplasty, Transluminal, Percutaneous CoronaryAnimalsAnti-Inflammatory AgentsApoptosisCell ProliferationCollagenCoronary DiseaseCoronary RestenosisDexamethasoneFemoral ArteryMaleMiceMice, Inbred C57BLModels, AnimalMuscle, Smooth, VascularStentsTunica Intima
TNO Identifier
238988
ISSN
00086363
Source
Cardiovascular Research, 68(3), pp. 415-424.
Pages
415-424
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