التفاصيل البيبلوغرافية
| العنوان: |
ENDOTHELIUM-TARGETED TRANSGENIC GTP-CYCLOHYDROLASE I OVEREXPRESSION INHIBITS NEOINTIMA FORMATION IN MOUSE CAROTID ARTERY. |
| المؤلفون: |
Song-Jie Liao1,2,3, Li Lin3, Jin-Sheng Zeng3, Ru-Xun Huang3, Channon, Keith M.4, Chen, Alex F.1,2 chenal@msu.edu |
| المصدر: |
Clinical & Experimental Pharmacology & Physiology. Dec2007, Vol. 34 Issue 12, p1260-1266. 7p. 1 Diagram, 5 Graphs. |
| مصطلحات موضوعية: |
*ENDOTHELIUM, *CAROTID artery, *TETRAHYDROBIOPTERIN, *TRANSLUMINAL angioplasty, *ANGIOPLASTY |
| مستخلص: |
1. Tetrahydrobiopterin (BH4) is an essential cofactor that maintains the normal function of endothelial nitric oxide (NO) synthase. Restenosis is a key complication after transluminal angioplasty. Guanosine 5′-triphosphate-cyclohydrolase I (GTPCH) is the first rate-limiting enzyme for de novo BH4 synthesis. However, the role of GTPCH in restenosis is not fully understood. The present study tested the hypothesis that endothelial-targeted GTPCH overexpression retards neointimal formation, a hallmark of restenosis, in mouse carotid artery. 2. Transluminal wire injury was induced in the left carotid arteries of adult male wild-type C57BL/6 (WT) and endothelial GTPCH transgenic (Tg-GCH) mice. Re-endothelialization was confirmed with in vivo Evans blue staining. Endothelium-dependent and -independent relaxations were measured using isometric tension recording. Morphological analysis was performed 2 and 4 weeks after carotid injury to assess neointimal formation. Fluorescence-based high-performance liquid chromatography (HPLC) was used to determine GTPCH activity and BH4 levels. Basal NO release following carotid injury was assessed by N G-nitro-l-arginine methyl ester-induced vascular contraction. 3. The endothelium was completely removed upon transluminal wire injury and full re-endothelialization was achieved at Day 10. Endothelium-dependent relaxation was impaired 10 days and 4 weeks after carotid injury, whereas endothelium-independent relaxation remained unaffected. Morphological analysis revealed that the endothelial-specific overexpression of GTPCH reduced neointimal formation and medial hypertrophy 2 and 4 weeks after carotid injury. Both arterial GTPCH enzyme activity and BH4 levels were significantly elevated in Tg-GCH mice compared with WT mice and basal NO release of the injured carotid artery tended to increase in Tg-GCH mice. 4. These findings suggest that the endothelial overexpression of GTPCH increased endothelial BH4 synthesis and played a preventive role in neointimal formation induced by endothelium denudation. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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