科研之友
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摘要
Hypoxic response element (HRE) offers satisfactory control over expression of hVEGF(165) in cell levels. However, the characteristics of regenerated blood vessels induced by long-term expression of transferred hVEGF(165) under control of HRE in vivo remain unknown. This study aims to investigate the effect of HRE on control of long-term expression of rAAV-delivered hVEGF(165) gene to ischemic myocardium and evaluate characteristics of angiogenesis induced by hVEGF(165) in vivo. Rabbit ischemic heart models were established surgically, rAAV-9HRE-hVEGF(165) was transfected to ischemia hearts subjected to 12 week ischemia. Molecular biological and immunohistochemistry were employed to determine expressions of HIF-1 alpha and hVEGF(165). Microvessel densities of CD31(+) and alpha-SMA(+) regenerated vessels were also evaluated. Expressions of both hVEGF(165) mRNA and protein were upregulated following overexpression of endogenous HIF-1 alpha early after ischemia, peaked at 4-6 weeks post-MI, declined, and approached pre-ischemia level at the end of 12 weeks of ischemia (P < 0.01). The significantly upregulated CD31 in hVEGF(165)-treated hearts presented from 8 to 12 weeks of ischemia compared with the control (P < 0.01). However, alpha-SMA expression was rapidly downregulated after ischemia and remained lower than the control level by the end of 12 weeks post-MI (P < 0.01). Overexpression of hVEGF(165) controlled by HIF-1 alpha-HRE system shows a stably regional angiogenic efficacy in vivo. But, VEGF, as an early angiogenic cytokine, is inadequate for mediating histologically mature vessels in ischemia myocardium. Exp Biol Med 234:1417-1424, 2009
- 出版日期2009-12
- 单位徐州医科大学
