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Angiotensin II promotes growth of vascular smooth muscle cells in vitro via the autocrine production of growth factors such as platelet-derived growth factor, basic fibroblast growth factor, and transforming growth factor-beta. Furthermore, experimental studies have demonstrated that angiotensin infusion can enhance smooth muscle proliferation after balloon injury in vivo. Consistent with this, angiotensin converting enzyme inhibitors have been shown to prevent myointimal proliferation. The origin of vascular angiotensin that participate in this process is of interest. We have demonstrated the presence of angiotensinogen messenger RNA (mRNA) in the adventitial and medial layers of the rat aorta and have speculated that local angiotensinogen production may play an important role during myointimal proliferation. To provide further evidence toward this hypothesis, we compared the localization and expression of angiotensinogen mRNA in control and balloon injured vessels using in situ hybridization.

Vascular injury induces angiotensinogen gene expression in the media and neointima.