Key result
Valsartan significantly blocked Angiotensin II-induced migration and proliferation of cultured human coronary artery smooth muscle cells in a concentration-dependent manner.
p-value: p=<0.05
Valsartan inhibits Angiotensin II-induced migration and proliferation of human coronary artery smooth muscle cells in vitro, suggesting a potential mechanism for preventing coronary atherosclerosis.
No practice change from this in vitro result; leaves open whether valsartan slows coronary atherosclerosis in vivo.
The migration as well as proliferation of coronary artery medial smooth muscle cells (SMC) into the intima is proposed to be an important process of intimal thickening in coronary atherosclerosis. In the current study, we examined the effects of the angiotensin type 1 receptor antagonist valsartan on angiotensin II (Ang II)-induced migration of cultured human coronary artery SMC using Boyden's chamber methods. Ang II significantly stimulated human coronary artery SMC migration in a concentration-dependent manner between 10(-6) and 10(-8) mol/l when cells of passage 4 to 6 were used. However, the migration response to Ang II was moderately decreased in cells of passage 10 to 12, and was markedly decreased in cells of passage 15 to 17, compared to that of passage 4 to 6. Ang II-induced migration was blocked by the Ang II type 1 (AT1) receptor antagonist valsartan in a concentration-dependent manner. By contrast, the Ang II type 2 (AT2) receptor antagonist PD 123319 did not affect Ang II-induced migration. Ang II modestly increased the cell number of human coronary artery SMC after a 24-h incubation. This increase in cell numbers was also clearly blocked by valsartan, but not by PD 123319. These results indicate that Ang II stimulates migration as well as proliferation via AT1 receptors in human coronary artery SMC when cells of passage 4 to 6 are used. Valsartan may prevent the progression of coronary atherosclerosis through an inhibition of Ang II-induced migration and proliferation in these cells, although in vivo evidence is lacking.
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Kohno et al. (2000) studied Coronary atherosclerosis (in vitro model). Valsartan vs. Angiotensin II alone was evaluated on Angiotensin II-induced cell migration (p=<0.05). Valsartan significantly blocked Angiotensin II-induced migration and proliferation of cultured human coronary artery smooth muscle cells in a concentration-dependent manner.