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In cultured vascular smooth muscle cells (VSMC) of SD rat, it was demonstrated that 10(-6) - 10(-5) mol/L NE and 10(-7) - 10(-5) mol/L isoproterenol stimulated proliferation and 3H-TdR incorporation of the cells in a dose dependent manner. These effects might be significantly inhibited by co-incubation with either alpha-receptor blocker phentolamine (10(-6) mol/L) or beta-receptor blocker propranolol (10(-5) mol/L). It was also found that cell counting and 3H-TdR incorporation were markedly decreased after incubation nifedipine (10(-6) mol/L) or verapamil (10(-6) mol/L) with NE (P < 0.01 as compared to that of NE group). It was further observed that nifedipine and verapamil inhibited DNA synthesis and proliferation of VSMC induced by isoproterenol.
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