Therapeutic Angiogenesis Induced by Hepatocyte Growth Factor : Potential Gene Therapy for Ischemic diseases

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Recent progress in molecular biology has led to the development of gene therapy as a new strategy to treat a variety of cardiovascular diseases. Targeted diseases range from single gene deficiency diseases to more complex diseases in adults such as restenosis after angioplasty. One obvious major target in the field of gene therapy is ischemic diseases such as myocardial infarction, angina and peripheral arterial diseases (i.e. ASO (arteriosclerosis obliterans)). In a large proportion of such patients, the anatomical extent and the distribution of arterial occlusive disease make the patients unsuitable for operative or percutaneous revascularization. Thus, the disease frequently follows an inexorable down-hill course. Of importance, there is no optimal medical therapy for severe ischemic hearts and critical ischemic limbs. Therefore, novel therapies are required to treat these patients. Recently, the efficacy of therapeutic angiogenesis using VEGF (vascular endothelial growth factor) gene transfer has been reported in human patients with critical limb ischemia and myocardial ischemia. Thus, the strategy for therapeutic angiogenesis using angiogenic growth factors should be considered for the treatment of patients with critical limb ischemia or myocardial infarction. The endothelial cell specificity of VEGF has been considered to be an important advantage for therapeutic angiogenesis, as endothelial cells represent the critical cellular element responsible for new vessel formation. Indeed, human gene therapy for ASO and angina has already begun in the USA, with surprising and beneficial effects. We have focused on hepatocyte growth factor (HGF), which is a mesenchyme-derived pleiotropic factor that regulates cell growth, cell motility, and morphogenesis in various types of cells. Recently, HGF is also considered to be a powertul growth tactor for endothelial cells. In this review, we described the potential gene therapy for ischemic diseases using HGF.

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