Abstract
Metalloproteinases (MMP)-2 and MMP-9 play a role in smooth muscle cell (SMC) migration from the media to the intima following arterial injury. Intravenous administration of adenovirus encoding tissue inhibitor of metalloproteinase-1 (TIMP-1) into balloon-injured rat arteries (3×10 11 viral particles/rat; n=7) resulted in a transient expression of TIMP-1 and a significant inhibition of neointima thickening within 16 days (∼40% vs. control; P=0.012). Three days after injury, the number of intimal SMCs was decreased by ∼98% in TIMP-1-treated rats. However, no alteration was seen in intimal SMC proliferation after 13 days of injury. Therefore, our results show that systemic gene transfer of TIMP-1 is a promising approach in early restenosis treatment.
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