title: The effect of short-term intra-arterial delivery of paclitaxel on neointimal hyperplasia and the local thrombotic environment after angioplasty.
abstract: OBJECTIVE
  To evaluate the effects of short-term intra-arterial delivery of paclitaxel on neointimal hyperplasia and the local thrombotic environment after angioplasty.
  
  
  METHODS
  An experimental common carotid artery injury model was established in 60 rats, which were divided into experimental groups (40 rats) and controls (20 rats). Local intra-arterial administration of paclitaxel was applied at 2 doses (90 and 180 μg/30 μl), and the effects of short-term delivery of paclitaxel on neointimal hyperplasia and the expression of tissue factor (TF), plasminogen activator inhibitor-1 (PAI-1) and tissue-type plasminogen activator (t-PA) were evaluated at days 15 and 30 by hematoxylin and eosin staining and immunohistochemistry.
  
  
  RESULTS
  At 15 and 30 days after injury, neointimal thickness and area, the ratio of intimal area to medial area and the stenotic rate were all significantly decreased in the group provided the high concentrations (180 μg/30 μl) of paclitaxel for 2 min or 10 min and in the group provided the low concentration (90 μg/30 μl) of paclitaxel for 10 min (p < 0.05). At 30 days after injury, there were no significant changes in TF expression among all experimental groups. PAI-1 expression increased in the neointima of the high concentration 10 min group (p < 0.05), while t-PA expression decreased in the neointima of the high concentration 2 min group (p < 0.05).
  
  
  CONCLUSIONS
  In the rat common carotid artery injury model, the short-term delivery of paclitaxel could effectively inhibit neointimal hyperplasia in the long term, with very little influence on the local expression of TF and PAI-1.
authors.affiliation: Department of Interventional Radiology, Affiliated Hospital of Hebei University, No. 212 Yuhua Road, Baoding, 071000, Hebei, China. eyj7681@yahoo.com.cn
authors.forename: Yajun
authors.initials: Y
authors.lastname: E
authors.forename: Nengshu
authors.initials: N
authors.lastname: He
authors.forename: Hailun
authors.initials: H
authors.lastname: Fan
mesh_terms: D000800:Angioplasty, Balloon / Q000009:adverse effects / Q000379:methods; D000818:Animals; D001707:Biopsy, Needle; D020212:Carotid Artery Injuries / Q000188:drug therapy* / Q000473:pathology*; D017536:Carotid Artery, Common / Q000187:drug effects* / Q000473:pathology; D004195:Disease Models, Animal; D004305:Dose-Response Relationship, Drug; D004334:Drug Administration Schedule; D006965:Hyperplasia / Q000188:drug therapy / Q000473:pathology; D007150:Immunohistochemistry; D007261:Infusions, Intra-Arterial; D008297:Male; D058426:Neointima / Q000473:pathology*; D017239:Paclitaxel / Q000494:pharmacology*; D011897:Random Allocation; D051381:Rats; D017208:Rats, Wistar; D018570:Risk Assessment; D013925:Thromboplastin / Q000032:analysis / Q000378:metabolism; D013927:Thrombosis / Q000209:etiology / Q000517:prevention & control; D013997:Time Factors; D010959:Tissue Plasminogen Activator / Q000032:analysis / Q000378:metabolism; D016896:Treatment Outcome
chemical_list: D013925:Thromboplastin; D010959:Tissue Plasminogen Activator; D017239:Paclitaxel