Abstract |
Restenosis is responsible to approximately 30% of long-term failure following therapeutic vascular procedures. Thrombosis plays a key role in the development of restenosis. Thrombin-specific inhibitors have been considered as one type of candidates for the prevention of restenosis. Previous studies by our group demonstrated that a novel thrombin-specific inhibitor, hirulog-like peptide (HLP), reduced balloon catheter-induced neointima formation in rat carotid arteries. The present study examined the effect of HLP on angioplasty-induced restenosis in carotid arteries of atherosclerotic rabbits. New Zealand white rabbits were subject to air desiccation of the lumen of the right carotid arteries, then received high cholesterol/fat diet for 3 weeks. The rabbits were intravenously infused with HLP (1.6 mg/(kg/h)) or saline (n=7 per group) for 4 h started before angioplasty which dilated atherosclerotic lesions in right common carotid artery. Four weeks after the angioplasty, neointimal area, stenosis and neointima/media ratio in injured carotid arteries were reduced in atherosclerotic rabbits treated with HLP compared to saline controls by 62, 39 and 59% (P<0.05). The expression of tissue factor (TF) and transforming growth factor ( TGF)-beta in the neointima of carotid arteries of rabbits treated with HLP was significantly weaker than saline controls (P<0.05 or <0.01). Activated partial thromboplastin time and bleeding time in HLP-treated rabbits were not significantly prolonged compared to controls. The results of the present study suggest that HLP may substantially reduce angioplasty-induced restenosis in atherosclerotic rabbits without increasing bleeding tendency. The inhibition on the expression of TF and TGF-beta in the neointima of the arterial wall may contribute to the preventive effect of HLP on restenosis in atherosclerotic rabbits.
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Authors | Xing Chen, Song Ren, Miranda G Ma, Sudharshan Dharmalingam, Lin Lu, Mengzhou Xue, John Ducas, Garry X Shen |
Journal | Atherosclerosis
(Atherosclerosis)
Vol. 169
Issue 1
Pg. 31-40
(Jul 2003)
ISSN: 0021-9150 [Print] Ireland |
PMID | 12860248
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Hirudins
- Peptide Fragments
- Recombinant Proteins
- Transforming Growth Factor beta
- hirulog-like peptide
- Collagen
- Thromboplastin
- bivalirudin
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Topics |
- Animals
- Arteriosclerosis
(metabolism, pathology)
- Bleeding Time
- Carotid Artery, Common
(metabolism, pathology)
- Carotid Stenosis
(metabolism, pathology)
- Collagen
(metabolism)
- Hirudins
(analogs & derivatives, pharmacology)
- Humans
- Immunohistochemistry
- Male
- Partial Thromboplastin Time
- Peptide Fragments
(pharmacology)
- Rabbits
- Rats
- Recombinant Proteins
(pharmacology)
- Recurrence
- Thromboplastin
(metabolism)
- Transforming Growth Factor beta
(metabolism)
- Tunica Intima
(metabolism, pathology)
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